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/* tc-mips.c -- assemble code for a MIPS chip.
Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
2003, 2004 Free Software Foundation, Inc.
Contributed by the OSF and Ralph Campbell.
Written by Keith Knowles and Ralph Campbell, working independently.
Modified for ECOFF and R4000 support by Ian Lance Taylor of Cygnus
Support.
This file is part of GAS.
GAS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GAS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GAS; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
#include "as.h"
#include "config.h"
#include "subsegs.h"
#include "safe-ctype.h"
#include <stdarg.h>
#include "opcode/mips.h"
#include "itbl-ops.h"
#include "dwarf2dbg.h"
#ifdef DEBUG
#define DBG(x) printf x
#else
#define DBG(x)
#endif
#ifdef OBJ_MAYBE_ELF
/* Clean up namespace so we can include obj-elf.h too. */
static int mips_output_flavor (void);
static int mips_output_flavor (void) { return OUTPUT_FLAVOR; }
#undef OBJ_PROCESS_STAB
#undef OUTPUT_FLAVOR
#undef S_GET_ALIGN
#undef S_GET_SIZE
#undef S_SET_ALIGN
#undef S_SET_SIZE
#undef obj_frob_file
#undef obj_frob_file_after_relocs
#undef obj_frob_symbol
#undef obj_pop_insert
#undef obj_sec_sym_ok_for_reloc
#undef OBJ_COPY_SYMBOL_ATTRIBUTES
#include "obj-elf.h"
/* Fix any of them that we actually care about. */
#undef OUTPUT_FLAVOR
#define OUTPUT_FLAVOR mips_output_flavor()
#endif
#if defined (OBJ_ELF)
#include "elf/mips.h"
#endif
#ifndef ECOFF_DEBUGGING
#define NO_ECOFF_DEBUGGING
#define ECOFF_DEBUGGING 0
#endif
int mips_flag_mdebug = -1;
/* Control generation of .pdr sections. Off by default on IRIX: the native
linker doesn't know about and discards them, but relocations against them
remain, leading to rld crashes. */
#ifdef TE_IRIX
int mips_flag_pdr = FALSE;
#else
int mips_flag_pdr = TRUE;
#endif
#include "ecoff.h"
#if defined (OBJ_ELF) || defined (OBJ_MAYBE_ELF)
static char *mips_regmask_frag;
#endif
#define ZERO 0
#define AT 1
#define TREG 24
#define PIC_CALL_REG 25
#define KT0 26
#define KT1 27
#define GP 28
#define SP 29
#define FP 30
#define RA 31
#define ILLEGAL_REG (32)
/* Allow override of standard little-endian ECOFF format. */
#ifndef ECOFF_LITTLE_FORMAT
#define ECOFF_LITTLE_FORMAT "ecoff-littlemips"
#endif
extern int target_big_endian;
/* The name of the readonly data section. */
#define RDATA_SECTION_NAME (OUTPUT_FLAVOR == bfd_target_ecoff_flavour \
? ".rdata" \
: OUTPUT_FLAVOR == bfd_target_coff_flavour \
? ".rdata" \
: OUTPUT_FLAVOR == bfd_target_elf_flavour \
? ".rodata" \
: (abort (), ""))
/* The ABI to use. */
enum mips_abi_level
{
NO_ABI = 0,
O32_ABI,
O64_ABI,
N32_ABI,
N64_ABI,
EABI_ABI
};
/* MIPS ABI we are using for this output file. */
static enum mips_abi_level mips_abi = NO_ABI;
/* Whether or not we have code that can call pic code. */
int mips_abicalls = FALSE;
/* This is the set of options which may be modified by the .set
pseudo-op. We use a struct so that .set push and .set pop are more
reliable. */
struct mips_set_options
{
/* MIPS ISA (Instruction Set Architecture) level. This is set to -1
if it has not been initialized. Changed by `.set mipsN', and the
-mipsN command line option, and the default CPU. */
int isa;
/* Enabled Application Specific Extensions (ASEs). These are set to -1
if they have not been initialized. Changed by `.set <asename>', by
command line options, and based on the default architecture. */
int ase_mips3d;
int ase_mdmx;
/* Whether we are assembling for the mips16 processor. 0 if we are
not, 1 if we are, and -1 if the value has not been initialized.
Changed by `.set mips16' and `.set nomips16', and the -mips16 and
-nomips16 command line options, and the default CPU. */
int mips16;
/* Non-zero if we should not reorder instructions. Changed by `.set
reorder' and `.set noreorder'. */
int noreorder;
/* Non-zero if we should not permit the $at ($1) register to be used
in instructions. Changed by `.set at' and `.set noat'. */
int noat;
/* Non-zero if we should warn when a macro instruction expands into
more than one machine instruction. Changed by `.set nomacro' and
`.set macro'. */
int warn_about_macros;
/* Non-zero if we should not move instructions. Changed by `.set
move', `.set volatile', `.set nomove', and `.set novolatile'. */
int nomove;
/* Non-zero if we should not optimize branches by moving the target
of the branch into the delay slot. Actually, we don't perform
this optimization anyhow. Changed by `.set bopt' and `.set
nobopt'. */
int nobopt;
/* Non-zero if we should not autoextend mips16 instructions.
Changed by `.set autoextend' and `.set noautoextend'. */
int noautoextend;
/* Restrict general purpose registers and floating point registers
to 32 bit. This is initially determined when -mgp32 or -mfp32
is passed but can changed if the assembler code uses .set mipsN. */
int gp32;
int fp32;
/* MIPS architecture (CPU) type. Changed by .set arch=FOO, the -march
command line option, and the default CPU. */
int arch;
};
/* True if -mgp32 was passed. */
static int file_mips_gp32 = -1;
/* True if -mfp32 was passed. */
static int file_mips_fp32 = -1;
/* This is the struct we use to hold the current set of options. Note
that we must set the isa field to ISA_UNKNOWN and the ASE fields to
-1 to indicate that they have not been initialized. */
static struct mips_set_options mips_opts =
{
ISA_UNKNOWN, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0, CPU_UNKNOWN
};
/* These variables are filled in with the masks of registers used.
The object format code reads them and puts them in the appropriate
place. */
unsigned long mips_gprmask;
unsigned long mips_cprmask[4];
/* MIPS ISA we are using for this output file. */
static int file_mips_isa = ISA_UNKNOWN;
/* True if -mips16 was passed or implied by arguments passed on the
command line (e.g., by -march). */
static int file_ase_mips16;
/* True if -mips3d was passed or implied by arguments passed on the
command line (e.g., by -march). */
static int file_ase_mips3d;
/* True if -mdmx was passed or implied by arguments passed on the
command line (e.g., by -march). */
static int file_ase_mdmx;
/* The argument of the -march= flag. The architecture we are assembling. */
static int file_mips_arch = CPU_UNKNOWN;
static const char *mips_arch_string;
/* The argument of the -mtune= flag. The architecture for which we
are optimizing. */
static int mips_tune = CPU_UNKNOWN;
static const char *mips_tune_string;
/* True when generating 32-bit code for a 64-bit processor. */
static int mips_32bitmode = 0;
/* True if the given ABI requires 32-bit registers. */
#define ABI_NEEDS_32BIT_REGS(ABI) ((ABI) == O32_ABI)
/* Likewise 64-bit registers. */
#define ABI_NEEDS_64BIT_REGS(ABI) \
((ABI) == N32_ABI \
|| (ABI) == N64_ABI \
|| (ABI) == O64_ABI)
/* Return true if ISA supports 64 bit gp register instructions. */
#define ISA_HAS_64BIT_REGS(ISA) ( \
(ISA) == ISA_MIPS3 \
|| (ISA) == ISA_MIPS4 \
|| (ISA) == ISA_MIPS5 \
|| (ISA) == ISA_MIPS64 \
|| (ISA) == ISA_MIPS64R2 \
)
/* Return true if ISA supports 64-bit right rotate (dror et al.)
instructions. */
#define ISA_HAS_DROR(ISA) ( \
(ISA) == ISA_MIPS64R2 \
)
/* Return true if ISA supports 32-bit right rotate (ror et al.)
instructions. */
#define ISA_HAS_ROR(ISA) ( \
(ISA) == ISA_MIPS32R2 \
|| (ISA) == ISA_MIPS64R2 \
)
#define HAVE_32BIT_GPRS \
(mips_opts.gp32 || ! ISA_HAS_64BIT_REGS (mips_opts.isa))
#define HAVE_32BIT_FPRS \
(mips_opts.fp32 || ! ISA_HAS_64BIT_REGS (mips_opts.isa))
#define HAVE_64BIT_GPRS (! HAVE_32BIT_GPRS)
#define HAVE_64BIT_FPRS (! HAVE_32BIT_FPRS)
#define HAVE_NEWABI (mips_abi == N32_ABI || mips_abi == N64_ABI)
#define HAVE_64BIT_OBJECTS (mips_abi == N64_ABI)
/* We can only have 64bit addresses if the object file format supports it. */
#define HAVE_32BIT_ADDRESSES \
(HAVE_32BIT_GPRS \
|| (bfd_arch_bits_per_address (stdoutput) == 32 \
|| ! HAVE_64BIT_OBJECTS)) \
#define HAVE_64BIT_ADDRESSES (! HAVE_32BIT_ADDRESSES)
/* Addresses are loaded in different ways, depending on the address size
in use. The n32 ABI Documentation also mandates the use of additions
with overflow checking, but existing implementations don't follow it. */
#define ADDRESS_ADD_INSN \
(HAVE_32BIT_ADDRESSES ? "addu" : "daddu")
#define ADDRESS_ADDI_INSN \
(HAVE_32BIT_ADDRESSES ? "addiu" : "daddiu")
#define ADDRESS_LOAD_INSN \
(HAVE_32BIT_ADDRESSES ? "lw" : "ld")
#define ADDRESS_STORE_INSN \
(HAVE_32BIT_ADDRESSES ? "sw" : "sd")
/* Return true if the given CPU supports the MIPS16 ASE. */
#define CPU_HAS_MIPS16(cpu) \
(strncmp (TARGET_CPU, "mips16", sizeof ("mips16") - 1) == 0 \
|| strncmp (TARGET_CANONICAL, "mips-lsi-elf", sizeof ("mips-lsi-elf") - 1) == 0)
/* Return true if the given CPU supports the MIPS3D ASE. */
#define CPU_HAS_MIPS3D(cpu) ((cpu) == CPU_SB1 \
)
/* Return true if the given CPU supports the MDMX ASE. */
#define CPU_HAS_MDMX(cpu) (FALSE \
)
/* True if CPU has a dror instruction. */
#define CPU_HAS_DROR(CPU) ((CPU) == CPU_VR5400 || (CPU) == CPU_VR5500)
/* True if CPU has a ror instruction. */
#define CPU_HAS_ROR(CPU) CPU_HAS_DROR (CPU)
/* True if mflo and mfhi can be immediately followed by instructions
which write to the HI and LO registers.
According to MIPS specifications, MIPS ISAs I, II, and III need
(at least) two instructions between the reads of HI/LO and
instructions which write them, and later ISAs do not. Contradicting
the MIPS specifications, some MIPS IV processor user manuals (e.g.
the UM for the NEC Vr5000) document needing the instructions between
HI/LO reads and writes, as well. Therefore, we declare only MIPS32,
MIPS64 and later ISAs to have the interlocks, plus any specific
earlier-ISA CPUs for which CPU documentation declares that the
instructions are really interlocked. */
#define hilo_interlocks \
(mips_opts.isa == ISA_MIPS32 \
|| mips_opts.isa == ISA_MIPS32R2 \
|| mips_opts.isa == ISA_MIPS64 \
|| mips_opts.isa == ISA_MIPS64R2 \
|| mips_opts.arch == CPU_R4010 \
|| mips_opts.arch == CPU_R10000 \
|| mips_opts.arch == CPU_R12000 \
|| mips_opts.arch == CPU_RM7000 \
|| mips_opts.arch == CPU_VR5500 \
)
/* Whether the processor uses hardware interlocks to protect reads
from the GPRs after they are loaded from memory, and thus does not
require nops to be inserted. This applies to instructions marked
INSN_LOAD_MEMORY_DELAY. These nops are only required at MIPS ISA
level I. */
#define gpr_interlocks \
(mips_opts.isa != ISA_MIPS1 \
|| mips_opts.arch == CPU_R3900)
/* Whether the processor uses hardware interlocks to avoid delays
required by coprocessor instructions, and thus does not require
nops to be inserted. This applies to instructions marked
INSN_LOAD_COPROC_DELAY, INSN_COPROC_MOVE_DELAY, and to delays
between instructions marked INSN_WRITE_COND_CODE and ones marked
INSN_READ_COND_CODE. These nops are only required at MIPS ISA
levels I, II, and III. */
/* Itbl support may require additional care here. */
#define cop_interlocks \
((mips_opts.isa != ISA_MIPS1 \
&& mips_opts.isa != ISA_MIPS2 \
&& mips_opts.isa != ISA_MIPS3) \
|| mips_opts.arch == CPU_R4300 \
)
/* Whether the processor uses hardware interlocks to protect reads
from coprocessor registers after they are loaded from memory, and
thus does not require nops to be inserted. This applies to
instructions marked INSN_COPROC_MEMORY_DELAY. These nops are only
requires at MIPS ISA level I. */
#define cop_mem_interlocks (mips_opts.isa != ISA_MIPS1)
/* Is this a mfhi or mflo instruction? */
#define MF_HILO_INSN(PINFO) \
((PINFO & INSN_READ_HI) || (PINFO & INSN_READ_LO))
/* MIPS PIC level. */
enum mips_pic_level mips_pic;
/* 1 if we should generate 32 bit offsets from the $gp register in
SVR4_PIC mode. Currently has no meaning in other modes. */
static int mips_big_got = 0;
/* 1 if trap instructions should used for overflow rather than break
instructions. */
static int mips_trap = 0;
/* 1 if double width floating point constants should not be constructed
by assembling two single width halves into two single width floating
point registers which just happen to alias the double width destination
register. On some architectures this aliasing can be disabled by a bit
in the status register, and the setting of this bit cannot be determined
automatically at assemble time. */
static int mips_disable_float_construction;
/* Non-zero if any .set noreorder directives were used. */
static int mips_any_noreorder;
/* Non-zero if nops should be inserted when the register referenced in
an mfhi/mflo instruction is read in the next two instructions. */
static int mips_7000_hilo_fix;
/* The size of the small data section. */
static unsigned int g_switch_value = 8;
/* Whether the -G option was used. */
static int g_switch_seen = 0;
#define N_RMASK 0xc4
#define N_VFP 0xd4
/* If we can determine in advance that GP optimization won't be
possible, we can skip the relaxation stuff that tries to produce
GP-relative references. This makes delay slot optimization work
better.
This function can only provide a guess, but it seems to work for
gcc output. It needs to guess right for gcc, otherwise gcc
will put what it thinks is a GP-relative instruction in a branch
delay slot.
I don't know if a fix is needed for the SVR4_PIC mode. I've only
fixed it for the non-PIC mode. KR 95/04/07 */
static int nopic_need_relax (symbolS *, int);
/* handle of the OPCODE hash table */
static struct hash_control *op_hash = NULL;
/* The opcode hash table we use for the mips16. */
static struct hash_control *mips16_op_hash = NULL;
/* This array holds the chars that always start a comment. If the
pre-processor is disabled, these aren't very useful */
const char comment_chars[] = "#";
/* This array holds the chars that only start a comment at the beginning of
a line. If the line seems to have the form '# 123 filename'
.line and .file directives will appear in the pre-processed output */
/* Note that input_file.c hand checks for '#' at the beginning of the
first line of the input file. This is because the compiler outputs
#NO_APP at the beginning of its output. */
/* Also note that C style comments are always supported. */
const char line_comment_chars[] = "#";
/* This array holds machine specific line separator characters. */
const char line_separator_chars[] = ";";
/* Chars that can be used to separate mant from exp in floating point nums */
const char EXP_CHARS[] = "eE";
/* Chars that mean this number is a floating point constant */
/* As in 0f12.456 */
/* or 0d1.2345e12 */
const char FLT_CHARS[] = "rRsSfFdDxXpP";
/* Also be aware that MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT may have to be
changed in read.c . Ideally it shouldn't have to know about it at all,
but nothing is ideal around here.
*/
static char *insn_error;
static int auto_align = 1;
/* When outputting SVR4 PIC code, the assembler needs to know the
offset in the stack frame from which to restore the $gp register.
This is set by the .cprestore pseudo-op, and saved in this
variable. */
static offsetT mips_cprestore_offset = -1;
/* Similar for NewABI PIC code, where $gp is callee-saved. NewABI has some
more optimizations, it can use a register value instead of a memory-saved
offset and even an other register than $gp as global pointer. */
static offsetT mips_cpreturn_offset = -1;
static int mips_cpreturn_register = -1;
static int mips_gp_register = GP;
static int mips_gprel_offset = 0;
/* Whether mips_cprestore_offset has been set in the current function
(or whether it has already been warned about, if not). */
static int mips_cprestore_valid = 0;
/* This is the register which holds the stack frame, as set by the
.frame pseudo-op. This is needed to implement .cprestore. */
static int mips_frame_reg = SP;
/* Whether mips_frame_reg has been set in the current function
(or whether it has already been warned about, if not). */
static int mips_frame_reg_valid = 0;
/* To output NOP instructions correctly, we need to keep information
about the previous two instructions. */
/* Whether we are optimizing. The default value of 2 means to remove
unneeded NOPs and swap branch instructions when possible. A value
of 1 means to not swap branches. A value of 0 means to always
insert NOPs. */
static int mips_optimize = 2;
/* Debugging level. -g sets this to 2. -gN sets this to N. -g0 is
equivalent to seeing no -g option at all. */
static int mips_debug = 0;
/* The previous instruction. */
static struct mips_cl_insn prev_insn;
/* The instruction before prev_insn. */
static struct mips_cl_insn prev_prev_insn;
/* If we don't want information for prev_insn or prev_prev_insn, we
point the insn_mo field at this dummy integer. */
static const struct mips_opcode dummy_opcode = { NULL, NULL, 0, 0, 0, 0 };
/* Non-zero if prev_insn is valid. */
static int prev_insn_valid;
/* The frag for the previous instruction. */
static struct frag *prev_insn_frag;
/* The offset into prev_insn_frag for the previous instruction. */
static long prev_insn_where;
/* The reloc type for the previous instruction, if any. */
static bfd_reloc_code_real_type prev_insn_reloc_type[3];
/* The reloc for the previous instruction, if any. */
static fixS *prev_insn_fixp[3];
/* Non-zero if the previous instruction was in a delay slot. */
static int prev_insn_is_delay_slot;
/* Non-zero if the previous instruction was in a .set noreorder. */
static int prev_insn_unreordered;
/* Non-zero if the previous instruction uses an extend opcode (if
mips16). */
static int prev_insn_extended;
/* Non-zero if the previous previous instruction was in a .set
noreorder. */
static int prev_prev_insn_unreordered;
/* If this is set, it points to a frag holding nop instructions which
were inserted before the start of a noreorder section. If those
nops turn out to be unnecessary, the size of the frag can be
decreased. */
static fragS *prev_nop_frag;
/* The number of nop instructions we created in prev_nop_frag. */
static int prev_nop_frag_holds;
/* The number of nop instructions that we know we need in
prev_nop_frag. */
static int prev_nop_frag_required;
/* The number of instructions we've seen since prev_nop_frag. */
static int prev_nop_frag_since;
/* For ECOFF and ELF, relocations against symbols are done in two
parts, with a HI relocation and a LO relocation. Each relocation
has only 16 bits of space to store an addend. This means that in
order for the linker to handle carries correctly, it must be able
to locate both the HI and the LO relocation. This means that the
relocations must appear in order in the relocation table.
In order to implement this, we keep track of each unmatched HI
relocation. We then sort them so that they immediately precede the
corresponding LO relocation. */
struct mips_hi_fixup
{
/* Next HI fixup. */
struct mips_hi_fixup *next;
/* This fixup. */
fixS *fixp;
/* The section this fixup is in. */
segT seg;
};
/* The list of unmatched HI relocs. */
static struct mips_hi_fixup *mips_hi_fixup_list;
/* The frag containing the last explicit relocation operator.
Null if explicit relocations have not been used. */
static fragS *prev_reloc_op_frag;
/* Map normal MIPS register numbers to mips16 register numbers. */
#define X ILLEGAL_REG
static const int mips32_to_16_reg_map[] =
{
X, X, 2, 3, 4, 5, 6, 7,
X, X, X, X, X, X, X, X,
0, 1, X, X, X, X, X, X,
X, X, X, X, X, X, X, X
};
#undef X
/* Map mips16 register numbers to normal MIPS register numbers. */
static const unsigned int mips16_to_32_reg_map[] =
{
16, 17, 2, 3, 4, 5, 6, 7
};
static int mips_fix_vr4120;
/* We don't relax branches by default, since this causes us to expand
`la .l2 - .l1' if there's a branch between .l1 and .l2, because we
fail to compute the offset before expanding the macro to the most
efficient expansion. */
static int mips_relax_branch;
/* The expansion of many macros depends on the type of symbol that
they refer to. For example, when generating position-dependent code,
a macro that refers to a symbol may have two different expansions,
one which uses GP-relative addresses and one which uses absolute
addresses. When generating SVR4-style PIC, a macro may have
different expansions for local and global symbols.
We handle these situations by generating both sequences and putting
them in variant frags. In position-dependent code, the first sequence
will be the GP-relative one and the second sequence will be the
absolute one. In SVR4 PIC, the first sequence will be for global
symbols and the second will be for local symbols.
The frag's "subtype" is RELAX_ENCODE (FIRST, SECOND), where FIRST and
SECOND are the lengths of the two sequences in bytes. These fields
can be extracted using RELAX_FIRST() and RELAX_SECOND(). In addition,
the subtype has the following flags:
RELAX_USE_SECOND
Set if it has been decided that we should use the second
sequence instead of the first.
RELAX_SECOND_LONGER
Set in the first variant frag if the macro's second implementation
is longer than its first. This refers to the macro as a whole,
not an individual relaxation.
RELAX_NOMACRO
Set in the first variant frag if the macro appeared in a .set nomacro
block and if one alternative requires a warning but the other does not.
RELAX_DELAY_SLOT
Like RELAX_NOMACRO, but indicates that the macro appears in a branch
delay slot.
The frag's "opcode" points to the first fixup for relaxable code.
Relaxable macros are generated using a sequence such as:
relax_start (SYMBOL);
... generate first expansion ...
relax_switch ();
... generate second expansion ...
relax_end ();
The code and fixups for the unwanted alternative are discarded
by md_convert_frag. */
#define RELAX_ENCODE(FIRST, SECOND) (((FIRST) << 8) | (SECOND))
#define RELAX_FIRST(X) (((X) >> 8) & 0xff)
#define RELAX_SECOND(X) ((X) & 0xff)
#define RELAX_USE_SECOND 0x10000
#define RELAX_SECOND_LONGER 0x20000
#define RELAX_NOMACRO 0x40000
#define RELAX_DELAY_SLOT 0x80000
/* Branch without likely bit. If label is out of range, we turn:
beq reg1, reg2, label
delay slot
into
bne reg1, reg2, 0f
nop
j label
0: delay slot
with the following opcode replacements:
beq <-> bne
blez <-> bgtz
bltz <-> bgez
bc1f <-> bc1t
bltzal <-> bgezal (with jal label instead of j label)
Even though keeping the delay slot instruction in the delay slot of
the branch would be more efficient, it would be very tricky to do
correctly, because we'd have to introduce a variable frag *after*
the delay slot instruction, and expand that instead. Let's do it
the easy way for now, even if the branch-not-taken case now costs
one additional instruction. Out-of-range branches are not supposed
to be common, anyway.
Branch likely. If label is out of range, we turn:
beql reg1, reg2, label
delay slot (annulled if branch not taken)
into
beql reg1, reg2, 1f
nop
beql $0, $0, 2f
nop
1: j[al] label
delay slot (executed only if branch taken)
2:
It would be possible to generate a shorter sequence by losing the
likely bit, generating something like:
bne reg1, reg2, 0f
nop
j[al] label
delay slot (executed only if branch taken)
0:
beql -> bne
bnel -> beq
blezl -> bgtz
bgtzl -> blez
bltzl -> bgez
bgezl -> bltz
bc1fl -> bc1t
bc1tl -> bc1f
bltzall -> bgezal (with jal label instead of j label)
bgezall -> bltzal (ditto)
but it's not clear that it would actually improve performance. */
#define RELAX_BRANCH_ENCODE(uncond, likely, link, toofar) \
((relax_substateT) \
(0xc0000000 \
| ((toofar) ? 1 : 0) \
| ((link) ? 2 : 0) \
| ((likely) ? 4 : 0) \
| ((uncond) ? 8 : 0)))
#define RELAX_BRANCH_P(i) (((i) & 0xf0000000) == 0xc0000000)
#define RELAX_BRANCH_UNCOND(i) (((i) & 8) != 0)
#define RELAX_BRANCH_LIKELY(i) (((i) & 4) != 0)
#define RELAX_BRANCH_LINK(i) (((i) & 2) != 0)
#define RELAX_BRANCH_TOOFAR(i) (((i) & 1) != 0)
/* For mips16 code, we use an entirely different form of relaxation.
mips16 supports two versions of most instructions which take
immediate values: a small one which takes some small value, and a
larger one which takes a 16 bit value. Since branches also follow
this pattern, relaxing these values is required.
We can assemble both mips16 and normal MIPS code in a single
object. Therefore, we need to support this type of relaxation at
the same time that we support the relaxation described above. We
use the high bit of the subtype field to distinguish these cases.
The information we store for this type of relaxation is the
argument code found in the opcode file for this relocation, whether
the user explicitly requested a small or extended form, and whether
the relocation is in a jump or jal delay slot. That tells us the
size of the value, and how it should be stored. We also store
whether the fragment is considered to be extended or not. We also
store whether this is known to be a branch to a different section,
whether we have tried to relax this frag yet, and whether we have
ever extended a PC relative fragment because of a shift count. */
#define RELAX_MIPS16_ENCODE(type, small, ext, dslot, jal_dslot) \
(0x80000000 \
| ((type) & 0xff) \
| ((small) ? 0x100 : 0) \
| ((ext) ? 0x200 : 0) \
| ((dslot) ? 0x400 : 0) \
| ((jal_dslot) ? 0x800 : 0))
#define RELAX_MIPS16_P(i) (((i) & 0xc0000000) == 0x80000000)
#define RELAX_MIPS16_TYPE(i) ((i) & 0xff)
#define RELAX_MIPS16_USER_SMALL(i) (((i) & 0x100) != 0)
#define RELAX_MIPS16_USER_EXT(i) (((i) & 0x200) != 0)
#define RELAX_MIPS16_DSLOT(i) (((i) & 0x400) != 0)
#define RELAX_MIPS16_JAL_DSLOT(i) (((i) & 0x800) != 0)
#define RELAX_MIPS16_EXTENDED(i) (((i) & 0x1000) != 0)
#define RELAX_MIPS16_MARK_EXTENDED(i) ((i) | 0x1000)
#define RELAX_MIPS16_CLEAR_EXTENDED(i) ((i) &~ 0x1000)
#define RELAX_MIPS16_LONG_BRANCH(i) (((i) & 0x2000) != 0)
#define RELAX_MIPS16_MARK_LONG_BRANCH(i) ((i) | 0x2000)
#define RELAX_MIPS16_CLEAR_LONG_BRANCH(i) ((i) &~ 0x2000)
/* Is the given value a sign-extended 32-bit value? */
#define IS_SEXT_32BIT_NUM(x) \
(((x) &~ (offsetT) 0x7fffffff) == 0 \
|| (((x) &~ (offsetT) 0x7fffffff) == ~ (offsetT) 0x7fffffff))
/* Is the given value a sign-extended 16-bit value? */
#define IS_SEXT_16BIT_NUM(x) \
(((x) &~ (offsetT) 0x7fff) == 0 \
|| (((x) &~ (offsetT) 0x7fff) == ~ (offsetT) 0x7fff))
/* Global variables used when generating relaxable macros. See the
comment above RELAX_ENCODE for more details about how relaxation
is used. */
static struct {
/* 0 if we're not emitting a relaxable macro.
1 if we're emitting the first of the two relaxation alternatives.
2 if we're emitting the second alternative. */
int sequence;
/* The first relaxable fixup in the current frag. (In other words,
the first fixup that refers to relaxable code.) */
fixS *first_fixup;
/* sizes[0] says how many bytes of the first alternative are stored in
the current frag. Likewise sizes[1] for the second alternative. */
unsigned int sizes[2];
/* The symbol on which the choice of sequence depends. */
symbolS *symbol;
} mips_relax;
/* Global variables used to decide whether a macro needs a warning. */
static struct {
/* True if the macro is in a branch delay slot. */
bfd_boolean delay_slot_p;
/* For relaxable macros, sizes[0] is the length of the first alternative
in bytes and sizes[1] is the length of the second alternative.
For non-relaxable macros, both elements give the length of the
macro in bytes. */
unsigned int sizes[2];
/* The first variant frag for this macro. */
fragS *first_frag;
} mips_macro_warning;
/* Prototypes for static functions. */
#define internalError() \
as_fatal (_("internal Error, line %d, %s"), __LINE__, __FILE__)
enum mips_regclass { MIPS_GR_REG, MIPS_FP_REG, MIPS16_REG };
static void append_insn
(struct mips_cl_insn *ip, expressionS *p, bfd_reloc_code_real_type *r);
static void mips_no_prev_insn (int);
static void mips16_macro_build
(expressionS *, const char *, const char *, va_list);
static void load_register (int, expressionS *, int);
static void macro_start (void);
static void macro_end (void);
static void macro (struct mips_cl_insn * ip);
static void mips16_macro (struct mips_cl_insn * ip);
#ifdef LOSING_COMPILER
static void macro2 (struct mips_cl_insn * ip);
#endif
static void mips_ip (char *str, struct mips_cl_insn * ip);
static void mips16_ip (char *str, struct mips_cl_insn * ip);
static void mips16_immed
(char *, unsigned int, int, offsetT, bfd_boolean, bfd_boolean, bfd_boolean,
unsigned long *, bfd_boolean *, unsigned short *);
static size_t my_getSmallExpression
(expressionS *, bfd_reloc_code_real_type *, char *);
static void my_getExpression (expressionS *, char *);
static void s_align (int);
static void s_change_sec (int);
static void s_change_section (int);
static void s_cons (int);
static void s_float_cons (int);
static void s_mips_globl (int);
static void s_option (int);
static void s_mipsset (int);
static void s_abicalls (int);
static void s_cpload (int);
static void s_cpsetup (int);
static void s_cplocal (int);
static void s_cprestore (int);
static void s_cpreturn (int);
static void s_gpvalue (int);
static void s_gpword (int);
static void s_gpdword (int);
static void s_cpadd (int);
static void s_insn (int);
static void md_obj_begin (void);
static void md_obj_end (void);
static void s_mips_ent (int);
static void s_mips_end (int);
static void s_mips_frame (int);
static void s_mips_mask (int reg_type);
static void s_mips_stab (int);
static void s_mips_weakext (int);
static void s_mips_file (int);
static void s_mips_loc (int);
static bfd_boolean pic_need_relax (symbolS *, asection *);
static int relaxed_branch_length (fragS *, asection *, int);
static int validate_mips_insn (const struct mips_opcode *);
/* Table and functions used to map between CPU/ISA names, and
ISA levels, and CPU numbers. */
struct mips_cpu_info
{
const char *name; /* CPU or ISA name. */
int is_isa; /* Is this an ISA? (If 0, a CPU.) */
int isa; /* ISA level. */
int cpu; /* CPU number (default CPU if ISA). */
};
static const struct mips_cpu_info *mips_parse_cpu (const char *, const char *);
static const struct mips_cpu_info *mips_cpu_info_from_isa (int);
static const struct mips_cpu_info *mips_cpu_info_from_arch (int);
/* Pseudo-op table.
The following pseudo-ops from the Kane and Heinrich MIPS book
should be defined here, but are currently unsupported: .alias,
.galive, .gjaldef, .gjrlive, .livereg, .noalias.
The following pseudo-ops from the Kane and Heinrich MIPS book are
specific to the type of debugging information being generated, and
should be defined by the object format: .aent, .begin, .bend,
.bgnb, .end, .endb, .ent, .fmask, .frame, .loc, .mask, .verstamp,
.vreg.
The following pseudo-ops from the Kane and Heinrich MIPS book are
not MIPS CPU specific, but are also not specific to the object file
format. This file is probably the best place to define them, but
they are not currently supported: .asm0, .endr, .lab, .repeat,
.struct. */
static const pseudo_typeS mips_pseudo_table[] =
{
/* MIPS specific pseudo-ops. */
{"option", s_option, 0},
{"set", s_mipsset, 0},
{"rdata", s_change_sec, 'r'},
{"sdata", s_change_sec, 's'},
{"livereg", s_ignore, 0},
{"abicalls", s_abicalls, 0},
{"cpload", s_cpload, 0},
{"cpsetup", s_cpsetup, 0},
{"cplocal", s_cplocal, 0},
{"cprestore", s_cprestore, 0},
{"cpreturn", s_cpreturn, 0},
{"gpvalue", s_gpvalue, 0},
{"gpword", s_gpword, 0},
{"gpdword", s_gpdword, 0},
{"cpadd", s_cpadd, 0},
{"insn", s_insn, 0},
/* Relatively generic pseudo-ops that happen to be used on MIPS
chips. */
{"asciiz", stringer, 1},
{"bss", s_change_sec, 'b'},
{"err", s_err, 0},
{"half", s_cons, 1},
{"dword", s_cons, 3},
{"weakext", s_mips_weakext, 0},
/* These pseudo-ops are defined in read.c, but must be overridden
here for one reason or another. */
{"align", s_align, 0},
{"byte", s_cons, 0},
{"data", s_change_sec, 'd'},
{"double", s_float_cons, 'd'},
{"float", s_float_cons, 'f'},
{"globl", s_mips_globl, 0},
{"global", s_mips_globl, 0},
{"hword", s_cons, 1},
{"int", s_cons, 2},
{"long", s_cons, 2},
{"octa", s_cons, 4},
{"quad", s_cons, 3},
{"section", s_change_section, 0},
{"short", s_cons, 1},
{"single", s_float_cons, 'f'},
{"stabn", s_mips_stab, 'n'},
{"text", s_change_sec, 't'},
{"word", s_cons, 2},
{ "extern", ecoff_directive_extern, 0},
{ NULL, NULL, 0 },
};
static const pseudo_typeS mips_nonecoff_pseudo_table[] =
{
/* These pseudo-ops should be defined by the object file format.
However, a.out doesn't support them, so we have versions here. */
{"aent", s_mips_ent, 1},
{"bgnb", s_ignore, 0},
{"end", s_mips_end, 0},
{"endb", s_ignore, 0},
{"ent", s_mips_ent, 0},
{"file", s_mips_file, 0},
{"fmask", s_mips_mask, 'F'},
{"frame", s_mips_frame, 0},
{"loc", s_mips_loc, 0},
{"mask", s_mips_mask, 'R'},
{"verstamp", s_ignore, 0},
{ NULL, NULL, 0 },
};
extern void pop_insert (const pseudo_typeS *);
void
mips_pop_insert (void)
{
pop_insert (mips_pseudo_table);
if (! ECOFF_DEBUGGING)
pop_insert (mips_nonecoff_pseudo_table);
}
/* Symbols labelling the current insn. */
struct insn_label_list
{
struct insn_label_list *next;
symbolS *label;
};
static struct insn_label_list *insn_labels;
static struct insn_label_list *free_insn_labels;
static void mips_clear_insn_labels (void);
static inline void
mips_clear_insn_labels (void)
{
register struct insn_label_list **pl;
for (pl = &free_insn_labels; *pl != NULL; pl = &(*pl)->next)
;
*pl = insn_labels;
insn_labels = NULL;
}
static char *expr_end;
/* Expressions which appear in instructions. These are set by
mips_ip. */
static expressionS imm_expr;
static expressionS imm2_expr;
static expressionS offset_expr;
/* Relocs associated with imm_expr and offset_expr. */
static bfd_reloc_code_real_type imm_reloc[3]
= {BFD_RELOC_UNUSED, BFD_RELOC_UNUSED, BFD_RELOC_UNUSED};
static bfd_reloc_code_real_type offset_reloc[3]
= {BFD_RELOC_UNUSED, BFD_RELOC_UNUSED, BFD_RELOC_UNUSED};
/* These are set by mips16_ip if an explicit extension is used. */
static bfd_boolean mips16_small, mips16_ext;
#ifdef OBJ_ELF
/* The pdr segment for per procedure frame/regmask info. Not used for
ECOFF debugging. */
static segT pdr_seg;
#endif
/* The default target format to use. */
const char *
mips_target_format (void)
{
switch (OUTPUT_FLAVOR)
{
case bfd_target_ecoff_flavour:
return target_big_endian ? "ecoff-bigmips" : ECOFF_LITTLE_FORMAT;
case bfd_target_coff_flavour:
return "pe-mips";
case bfd_target_elf_flavour:
#ifdef TE_TMIPS
/* This is traditional mips. */
return (target_big_endian
? (HAVE_64BIT_OBJECTS
? "elf64-tradbigmips"
: (HAVE_NEWABI
? "elf32-ntradbigmips" : "elf32-tradbigmips"))
: (HAVE_64BIT_OBJECTS
? "elf64-tradlittlemips"
: (HAVE_NEWABI
? "elf32-ntradlittlemips" : "elf32-tradlittlemips")));
#else
return (target_big_endian
? (HAVE_64BIT_OBJECTS
? "elf64-bigmips"
: (HAVE_NEWABI
? "elf32-nbigmips" : "elf32-bigmips"))
: (HAVE_64BIT_OBJECTS
? "elf64-littlemips"
: (HAVE_NEWABI
? "elf32-nlittlemips" : "elf32-littlemips")));
#endif
default:
abort ();
return NULL;
}
}
/* This function is called once, at assembler startup time. It should
set up all the tables, etc. that the MD part of the assembler will need. */
void
md_begin (void)
{
register const char *retval = NULL;
int i = 0;
int broken = 0;
if (! bfd_set_arch_mach (stdoutput, bfd_arch_mips, file_mips_arch))
as_warn (_("Could not set architecture and machine"));
op_hash = hash_new ();
for (i = 0; i < NUMOPCODES;)
{
const char *name = mips_opcodes[i].name;
retval = hash_insert (op_hash, name, (void *) &mips_opcodes[i]);
if (retval != NULL)
{
fprintf (stderr, _("internal error: can't hash `%s': %s\n"),
mips_opcodes[i].name, retval);
/* Probably a memory allocation problem? Give up now. */
as_fatal (_("Broken assembler. No assembly attempted."));
}
do
{
if (mips_opcodes[i].pinfo != INSN_MACRO)
{
if (!validate_mips_insn (&mips_opcodes[i]))
broken = 1;
}
++i;
}
while ((i < NUMOPCODES) && !strcmp (mips_opcodes[i].name, name));
}
mips16_op_hash = hash_new ();
i = 0;
while (i < bfd_mips16_num_opcodes)
{
const char *name = mips16_opcodes[i].name;
retval = hash_insert (mips16_op_hash, name, (void *) &mips16_opcodes[i]);
if (retval != NULL)
as_fatal (_("internal: can't hash `%s': %s"),
mips16_opcodes[i].name, retval);
do
{
if (mips16_opcodes[i].pinfo != INSN_MACRO
&& ((mips16_opcodes[i].match & mips16_opcodes[i].mask)
!= mips16_opcodes[i].match))
{
fprintf (stderr, _("internal error: bad mips16 opcode: %s %s\n"),
mips16_opcodes[i].name, mips16_opcodes[i].args);
broken = 1;
}
++i;
}
while (i < bfd_mips16_num_opcodes
&& strcmp (mips16_opcodes[i].name, name) == 0);
}
if (broken)
as_fatal (_("Broken assembler. No assembly attempted."));
/* We add all the general register names to the symbol table. This
helps us detect invalid uses of them. */
for (i = 0; i < 32; i++)
{
char buf[5];
sprintf (buf, "$%d", i);
symbol_table_insert (symbol_new (buf, reg_section, i,
&zero_address_frag));
}
symbol_table_insert (symbol_new ("$ra", reg_section, RA,
&zero_address_frag));
symbol_table_insert (symbol_new ("$fp", reg_section, FP,
&zero_address_frag));
symbol_table_insert (symbol_new ("$sp", reg_section, SP,
&zero_address_frag));
symbol_table_insert (symbol_new ("$gp", reg_section, GP,
&zero_address_frag));
symbol_table_insert (symbol_new ("$at", reg_section, AT,
&zero_address_frag));
symbol_table_insert (symbol_new ("$kt0", reg_section, KT0,
&zero_address_frag));
symbol_table_insert (symbol_new ("$kt1", reg_section, KT1,
&zero_address_frag));
symbol_table_insert (symbol_new ("$zero", reg_section, ZERO,
&zero_address_frag));
symbol_table_insert (symbol_new ("$pc", reg_section, -1,
&zero_address_frag));
/* If we don't add these register names to the symbol table, they
may end up being added as regular symbols by operand(), and then
make it to the object file as undefined in case they're not
regarded as local symbols. They're local in o32, since `$' is a
local symbol prefix, but not in n32 or n64. */
for (i = 0; i < 8; i++)
{
char buf[6];
sprintf (buf, "$fcc%i", i);
symbol_table_insert (symbol_new (buf, reg_section, -1,
&zero_address_frag));
}
mips_no_prev_insn (FALSE);
mips_gprmask = 0;
mips_cprmask[0] = 0;
mips_cprmask[1] = 0;
mips_cprmask[2] = 0;
mips_cprmask[3] = 0;
/* set the default alignment for the text section (2**2) */
record_alignment (text_section, 2);
bfd_set_gp_size (stdoutput, g_switch_value);
if (OUTPUT_FLAVOR == bfd_target_elf_flavour)
{
/* On a native system, sections must be aligned to 16 byte
boundaries. When configured for an embedded ELF target, we
don't bother. */
if (strcmp (TARGET_OS, "elf") != 0)
{
(void) bfd_set_section_alignment (stdoutput, text_section, 4);
(void) bfd_set_section_alignment (stdoutput, data_section, 4);
(void) bfd_set_section_alignment (stdoutput, bss_section, 4);
}
/* Create a .reginfo section for register masks and a .mdebug
section for debugging information. */
{
segT seg;
subsegT subseg;
flagword flags;
segT sec;
seg = now_seg;
subseg = now_subseg;
/* The ABI says this section should be loaded so that the
running program can access it. However, we don't load it
if we are configured for an embedded target */
flags = SEC_READONLY | SEC_DATA;
if (strcmp (TARGET_OS, "elf") != 0)
flags |= SEC_ALLOC | SEC_LOAD;
if (mips_abi != N64_ABI)
{
sec = subseg_new (".reginfo", (subsegT) 0);
bfd_set_section_flags (stdoutput, sec, flags);
bfd_set_section_alignment (stdoutput, sec, HAVE_NEWABI ? 3 : 2);
#ifdef OBJ_ELF
mips_regmask_frag = frag_more (sizeof (Elf32_External_RegInfo));
#endif
}
else
{
/* The 64-bit ABI uses a .MIPS.options section rather than
.reginfo section. */
sec = subseg_new (".MIPS.options", (subsegT) 0);
bfd_set_section_flags (stdoutput, sec, flags);
bfd_set_section_alignment (stdoutput, sec, 3);
#ifdef OBJ_ELF
/* Set up the option header. */
{
Elf_Internal_Options opthdr;
char *f;
opthdr.kind = ODK_REGINFO;
opthdr.size = (sizeof (Elf_External_Options)
+ sizeof (Elf64_External_RegInfo));
opthdr.section = 0;
opthdr.info = 0;
f = frag_more (sizeof (Elf_External_Options));
bfd_mips_elf_swap_options_out (stdoutput, &opthdr,
(Elf_External_Options *) f);
mips_regmask_frag = frag_more (sizeof (Elf64_External_RegInfo));
}
#endif
}
if (ECOFF_DEBUGGING)
{
sec = subseg_new (".mdebug", (subsegT) 0);
(void) bfd_set_section_flags (stdoutput, sec,
SEC_HAS_CONTENTS | SEC_READONLY);
(void) bfd_set_section_alignment (stdoutput, sec, 2);
}
#ifdef OBJ_ELF
else if (OUTPUT_FLAVOR == bfd_target_elf_flavour && mips_flag_pdr)
{
pdr_seg = subseg_new (".pdr", (subsegT) 0);
(void) bfd_set_section_flags (stdoutput, pdr_seg,
SEC_READONLY | SEC_RELOC
| SEC_DEBUGGING);
(void) bfd_set_section_alignment (stdoutput, pdr_seg, 2);
}
#endif
subseg_set (seg, subseg);
}
}
if (! ECOFF_DEBUGGING)
md_obj_begin ();
}
void
md_mips_end (void)
{
if (! ECOFF_DEBUGGING)
md_obj_end ();
}
void
md_assemble (char *str)
{
struct mips_cl_insn insn;
bfd_reloc_code_real_type unused_reloc[3]
= {BFD_RELOC_UNUSED, BFD_RELOC_UNUSED, BFD_RELOC_UNUSED};
imm_expr.X_op = O_absent;
imm2_expr.X_op = O_absent;
offset_expr.X_op = O_absent;
imm_reloc[0] = BFD_RELOC_UNUSED;
imm_reloc[1] = BFD_RELOC_UNUSED;
imm_reloc[2] = BFD_RELOC_UNUSED;
offset_reloc[0] = BFD_RELOC_UNUSED;
offset_reloc[1] = BFD_RELOC_UNUSED;
offset_reloc[2] = BFD_RELOC_UNUSED;
if (mips_opts.mips16)
mips16_ip (str, &insn);
else
{
mips_ip (str, &insn);
DBG ((_("returned from mips_ip(%s) insn_opcode = 0x%x\n"),
str, insn.insn_opcode));
}
if (insn_error)
{
as_bad ("%s `%s'", insn_error, str);
return;
}
if (insn.insn_mo->pinfo == INSN_MACRO)
{
macro_start ();
if (mips_opts.mips16)
mips16_macro (&insn);
else
macro (&insn);
macro_end ();
}
else
{
if (imm_expr.X_op != O_absent)
append_insn (&insn, &imm_expr, imm_reloc);
else if (offset_expr.X_op != O_absent)
append_insn (&insn, &offset_expr, offset_reloc);
else
append_insn (&insn, NULL, unused_reloc);
}
}
/* Return true if the given relocation might need a matching %lo().
Note that R_MIPS_GOT16 relocations only need a matching %lo() when
applied to local symbols. */
static inline bfd_boolean
reloc_needs_lo_p (bfd_reloc_code_real_type reloc)
{
return (reloc == BFD_RELOC_HI16_S
|| reloc == BFD_RELOC_MIPS_GOT16);
}
/* Return true if the given fixup is followed by a matching R_MIPS_LO16
relocation. */
static inline bfd_boolean
fixup_has_matching_lo_p (fixS *fixp)
{
return (fixp->fx_next != NULL
&& fixp->fx_next->fx_r_type == BFD_RELOC_LO16
&& fixp->fx_addsy == fixp->fx_next->fx_addsy
&& fixp->fx_offset == fixp->fx_next->fx_offset);
}
/* See whether instruction IP reads register REG. CLASS is the type
of register. */
static int
insn_uses_reg (struct mips_cl_insn *ip, unsigned int reg,
enum mips_regclass class)
{
if (class == MIPS16_REG)
{
assert (mips_opts.mips16);
reg = mips16_to_32_reg_map[reg];
class = MIPS_GR_REG;
}
/* Don't report on general register ZERO, since it never changes. */
if (class == MIPS_GR_REG && reg == ZERO)
return 0;
if (class == MIPS_FP_REG)
{
assert (! mips_opts.mips16);
/* If we are called with either $f0 or $f1, we must check $f0.
This is not optimal, because it will introduce an unnecessary
NOP between "lwc1 $f0" and "swc1 $f1". To fix this we would
need to distinguish reading both $f0 and $f1 or just one of
them. Note that we don't have to check the other way,
because there is no instruction that sets both $f0 and $f1
and requires a delay. */
if ((ip->insn_mo->pinfo & INSN_READ_FPR_S)
&& ((((ip->insn_opcode >> OP_SH_FS) & OP_MASK_FS) &~(unsigned)1)
== (reg &~ (unsigned) 1)))
return 1;
if ((ip->insn_mo->pinfo & INSN_READ_FPR_T)
&& ((((ip->insn_opcode >> OP_SH_FT) & OP_MASK_FT) &~(unsigned)1)
== (reg &~ (unsigned) 1)))
return 1;
}
else if (! mips_opts.mips16)
{
if ((ip->insn_mo->pinfo & INSN_READ_GPR_S)
&& ((ip->insn_opcode >> OP_SH_RS) & OP_MASK_RS) == reg)
return 1;
if ((ip->insn_mo->pinfo & INSN_READ_GPR_T)
&& ((ip->insn_opcode >> OP_SH_RT) & OP_MASK_RT) == reg)
return 1;
}
else
{
if ((ip->insn_mo->pinfo & MIPS16_INSN_READ_X)
&& (mips16_to_32_reg_map[((ip->insn_opcode >> MIPS16OP_SH_RX)
& MIPS16OP_MASK_RX)]
== reg))
return 1;
if ((ip->insn_mo->pinfo & MIPS16_INSN_READ_Y)
&& (mips16_to_32_reg_map[((ip->insn_opcode >> MIPS16OP_SH_RY)
& MIPS16OP_MASK_RY)]
== reg))
return 1;
if ((ip->insn_mo->pinfo & MIPS16_INSN_READ_Z)
&& (mips16_to_32_reg_map[((ip->insn_opcode >> MIPS16OP_SH_MOVE32Z)
& MIPS16OP_MASK_MOVE32Z)]
== reg))
return 1;
if ((ip->insn_mo->pinfo & MIPS16_INSN_READ_T) && reg == TREG)
return 1;
if ((ip->insn_mo->pinfo & MIPS16_INSN_READ_SP) && reg == SP)
return 1;
if ((ip->insn_mo->pinfo & MIPS16_INSN_READ_31) && reg == RA)
return 1;
if ((ip->insn_mo->pinfo & MIPS16_INSN_READ_GPR_X)
&& ((ip->insn_opcode >> MIPS16OP_SH_REGR32)
& MIPS16OP_MASK_REGR32) == reg)
return 1;
}
return 0;
}
/* This function returns true if modifying a register requires a
delay. */
static int
reg_needs_delay (unsigned int reg)
{
unsigned long prev_pinfo;
prev_pinfo = prev_insn.insn_mo->pinfo;
if (! mips_opts.noreorder
&& (((prev_pinfo & INSN_LOAD_MEMORY_DELAY)
&& ! gpr_interlocks)
|| ((prev_pinfo & INSN_LOAD_COPROC_DELAY)
&& ! cop_interlocks)))
{
/* A load from a coprocessor or from memory. All load delays
delay the use of general register rt for one instruction. */
/* Itbl support may require additional care here. */
know (prev_pinfo & INSN_WRITE_GPR_T);
if (reg == ((prev_insn.insn_opcode >> OP_SH_RT) & OP_MASK_RT))
return 1;
}
return 0;
}
/* Mark instruction labels in mips16 mode. This permits the linker to
handle them specially, such as generating jalx instructions when
needed. We also make them odd for the duration of the assembly, in
order to generate the right sort of code. We will make them even
in the adjust_symtab routine, while leaving them marked. This is
convenient for the debugger and the disassembler. The linker knows
to make them odd again. */
static void
mips16_mark_labels (void)
{
if (mips_opts.mips16)
{
struct insn_label_list *l;
valueT val;
for (l = insn_labels; l != NULL; l = l->next)
{
#ifdef OBJ_ELF
if (OUTPUT_FLAVOR == bfd_target_elf_flavour)
S_SET_OTHER (l->label, STO_MIPS16);
#endif
val = S_GET_VALUE (l->label);
if ((val & 1) == 0)
S_SET_VALUE (l->label, val + 1);
}
}
}
/* End the current frag. Make it a variant frag and record the
relaxation info. */
static void
relax_close_frag (void)
{
mips_macro_warning.first_frag = frag_now;
frag_var (rs_machine_dependent, 0, 0,
RELAX_ENCODE (mips_relax.sizes[0], mips_relax.sizes[1]),
mips_relax.symbol, 0, (char *) mips_relax.first_fixup);
memset (&mips_relax.sizes, 0, sizeof (mips_relax.sizes));
mips_relax.first_fixup = 0;
}
/* Start a new relaxation sequence whose expansion depends on SYMBOL.
See the comment above RELAX_ENCODE for more details. */
static void
relax_start (symbolS *symbol)
{
assert (mips_relax.sequence == 0);
mips_relax.sequence = 1;
mips_relax.symbol = symbol;
}
/* Start generating the second version of a relaxable sequence.
See the comment above RELAX_ENCODE for more details. */
static void
relax_switch (void)
{
assert (mips_relax.sequence == 1);
mips_relax.sequence = 2;
}
/* End the current relaxable sequence. */
static void
relax_end (void)
{
assert (mips_relax.sequence == 2);
relax_close_frag ();
mips_relax.sequence = 0;
}
/* Output an instruction. IP is the instruction information.
ADDRESS_EXPR is an operand of the instruction to be used with
RELOC_TYPE. */
static void
append_insn (struct mips_cl_insn *ip, expressionS *address_expr,
bfd_reloc_code_real_type *reloc_type)
{
register unsigned long prev_pinfo, pinfo;
char *f;
fixS *fixp[3];
int nops = 0;
relax_stateT prev_insn_frag_type = 0;
bfd_boolean relaxed_branch = FALSE;
bfd_boolean force_new_frag = FALSE;
/* Mark instruction labels in mips16 mode. */
mips16_mark_labels ();
prev_pinfo = prev_insn.insn_mo->pinfo;
pinfo = ip->insn_mo->pinfo;
if (mips_relax.sequence != 2
&& (!mips_opts.noreorder || prev_nop_frag != NULL))
{
int prev_prev_nop;
/* If the previous insn required any delay slots, see if we need
to insert a NOP or two. There are eight kinds of possible
hazards, of which an instruction can have at most one type.
(1) a load from memory delay
(2) a load from a coprocessor delay
(3) an unconditional branch delay
(4) a conditional branch delay
(5) a move to coprocessor register delay
(6) a load coprocessor register from memory delay
(7) a coprocessor condition code delay
(8) a HI/LO special register delay
There are a lot of optimizations we could do that we don't.
In particular, we do not, in general, reorder instructions.
If you use gcc with optimization, it will reorder
instructions and generally do much more optimization then we
do here; repeating all that work in the assembler would only
benefit hand written assembly code, and does not seem worth
it. */
/* This is how a NOP is emitted. */
#define emit_nop() \
(mips_opts.mips16 \
? md_number_to_chars (frag_more (2), 0x6500, 2) \
: md_number_to_chars (frag_more (4), 0, 4))
/* The previous insn might require a delay slot, depending upon
the contents of the current insn. */
if (! mips_opts.mips16
&& (((prev_pinfo & INSN_LOAD_MEMORY_DELAY)
&& ! gpr_interlocks)
|| ((prev_pinfo & INSN_LOAD_COPROC_DELAY)
&& ! cop_interlocks)))
{
/* A load from a coprocessor or from memory. All load
delays delay the use of general register rt for one
instruction. */
/* Itbl support may require additional care here. */
know (prev_pinfo & INSN_WRITE_GPR_T);
if (mips_optimize == 0
|| insn_uses_reg (ip,
((prev_insn.insn_opcode >> OP_SH_RT)
& OP_MASK_RT),
MIPS_GR_REG))
++nops;
}
else if (! mips_opts.mips16
&& (((prev_pinfo & INSN_COPROC_MOVE_DELAY)
&& ! cop_interlocks)
|| ((prev_pinfo & INSN_COPROC_MEMORY_DELAY)
&& ! cop_mem_interlocks)))
{
/* A generic coprocessor delay. The previous instruction
modified a coprocessor general or control register. If
it modified a control register, we need to avoid any
coprocessor instruction (this is probably not always
required, but it sometimes is). If it modified a general
register, we avoid using that register.
This case is not handled very well. There is no special
knowledge of CP0 handling, and the coprocessors other
than the floating point unit are not distinguished at
all. */
/* Itbl support may require additional care here. FIXME!
Need to modify this to include knowledge about
user specified delays! */
if (prev_pinfo & INSN_WRITE_FPR_T)
{
if (mips_optimize == 0
|| insn_uses_reg (ip,
((prev_insn.insn_opcode >> OP_SH_FT)
& OP_MASK_FT),
MIPS_FP_REG))
++nops;
}
else if (prev_pinfo & INSN_WRITE_FPR_S)
{
if (mips_optimize == 0
|| insn_uses_reg (ip,
((prev_insn.insn_opcode >> OP_SH_FS)
& OP_MASK_FS),
MIPS_FP_REG))
++nops;
}
else
{
/* We don't know exactly what the previous instruction
does. If the current instruction uses a coprocessor
register, we must insert a NOP. If previous
instruction may set the condition codes, and the
current instruction uses them, we must insert two
NOPS. */
/* Itbl support may require additional care here. */
if (mips_optimize == 0
|| ((prev_pinfo & INSN_WRITE_COND_CODE)
&& (pinfo & INSN_READ_COND_CODE)))
nops += 2;
else if (pinfo & INSN_COP)
++nops;
}
}
else if (! mips_opts.mips16
&& (prev_pinfo & INSN_WRITE_COND_CODE)
&& ! cop_interlocks)
{
/* The previous instruction sets the coprocessor condition
codes, but does not require a general coprocessor delay
(this means it is a floating point comparison
instruction). If this instruction uses the condition
codes, we need to insert a single NOP. */
/* Itbl support may require additional care here. */
if (mips_optimize == 0
|| (pinfo & INSN_READ_COND_CODE))
++nops;
}
/* If we're fixing up mfhi/mflo for the r7000 and the
previous insn was an mfhi/mflo and the current insn
reads the register that the mfhi/mflo wrote to, then
insert two nops. */
else if (mips_7000_hilo_fix
&& MF_HILO_INSN (prev_pinfo)
&& insn_uses_reg (ip, ((prev_insn.insn_opcode >> OP_SH_RD)
& OP_MASK_RD),
MIPS_GR_REG))
{
nops += 2;
}
/* If we're fixing up mfhi/mflo for the r7000 and the
2nd previous insn was an mfhi/mflo and the current insn
reads the register that the mfhi/mflo wrote to, then
insert one nop. */
else if (mips_7000_hilo_fix
&& MF_HILO_INSN (prev_prev_insn.insn_opcode)
&& insn_uses_reg (ip, ((prev_prev_insn.insn_opcode >> OP_SH_RD)
& OP_MASK_RD),
MIPS_GR_REG))
{
++nops;
}
else if (prev_pinfo & INSN_READ_LO)
{
/* The previous instruction reads the LO register; if the
current instruction writes to the LO register, we must
insert two NOPS. Some newer processors have interlocks.
Also the tx39's multiply instructions can be executed
immediately after a read from HI/LO (without the delay),
though the tx39's divide insns still do require the
delay. */
if (! (hilo_interlocks
|| (mips_opts.arch == CPU_R3900 && (pinfo & INSN_MULT)))
&& (mips_optimize == 0
|| (pinfo & INSN_WRITE_LO)))
nops += 2;
/* Most mips16 branch insns don't have a delay slot.
If a read from LO is immediately followed by a branch
to a write to LO we have a read followed by a write
less than 2 insns away. We assume the target of
a branch might be a write to LO, and insert a nop
between a read and an immediately following branch. */
else if (mips_opts.mips16
&& (mips_optimize == 0
|| (pinfo & MIPS16_INSN_BRANCH)))
++nops;
}
else if (prev_insn.insn_mo->pinfo & INSN_READ_HI)
{
/* The previous instruction reads the HI register; if the
current instruction writes to the HI register, we must
insert a NOP. Some newer processors have interlocks.
Also the note tx39's multiply above. */
if (! (hilo_interlocks
|| (mips_opts.arch == CPU_R3900 && (pinfo & INSN_MULT)))
&& (mips_optimize == 0
|| (pinfo & INSN_WRITE_HI)))
nops += 2;
/* Most mips16 branch insns don't have a delay slot.
If a read from HI is immediately followed by a branch
to a write to HI we have a read followed by a write
less than 2 insns away. We assume the target of
a branch might be a write to HI, and insert a nop
between a read and an immediately following branch. */
else if (mips_opts.mips16
&& (mips_optimize == 0
|| (pinfo & MIPS16_INSN_BRANCH)))
++nops;
}
/* If the previous instruction was in a noreorder section, then
we don't want to insert the nop after all. */
/* Itbl support may require additional care here. */
if (prev_insn_unreordered)
nops = 0;
/* There are two cases which require two intervening
instructions: 1) setting the condition codes using a move to
coprocessor instruction which requires a general coprocessor
delay and then reading the condition codes 2) reading the HI
or LO register and then writing to it (except on processors
which have interlocks). If we are not already emitting a NOP
instruction, we must check for these cases compared to the
instruction previous to the previous instruction. */
if ((! mips_opts.mips16
&& (prev_prev_insn.insn_mo->pinfo & INSN_COPROC_MOVE_DELAY)
&& (prev_prev_insn.insn_mo->pinfo & INSN_WRITE_COND_CODE)
&& (pinfo & INSN_READ_COND_CODE)
&& ! cop_interlocks)
|| ((prev_prev_insn.insn_mo->pinfo & INSN_READ_LO)
&& (pinfo & INSN_WRITE_LO)
&& ! (hilo_interlocks
|| (mips_opts.arch == CPU_R3900 && (pinfo & INSN_MULT))))
|| ((prev_prev_insn.insn_mo->pinfo & INSN_READ_HI)
&& (pinfo & INSN_WRITE_HI)
&& ! (hilo_interlocks
|| (mips_opts.arch == CPU_R3900 && (pinfo & INSN_MULT)))))
prev_prev_nop = 1;
else
prev_prev_nop = 0;
if (prev_prev_insn_unreordered)
prev_prev_nop = 0;
if (prev_prev_nop && nops == 0)
++nops;
if (mips_fix_vr4120 && prev_insn.insn_mo->name)
{
/* We're out of bits in pinfo, so we must resort to string
ops here. Shortcuts are selected based on opcodes being
limited to the VR4120 instruction set. */
int min_nops = 0;
const char *pn = prev_insn.insn_mo->name;
const char *tn = ip->insn_mo->name;
if (strncmp(pn, "macc", 4) == 0
|| strncmp(pn, "dmacc", 5) == 0)
{
/* Errata 21 - [D]DIV[U] after [D]MACC */
if (strstr (tn, "div"))
{
min_nops = 1;
}
/* Errata 23 - Continuous DMULT[U]/DMACC instructions */
if (pn[0] == 'd' /* dmacc */
&& (strncmp(tn, "dmult", 5) == 0
|| strncmp(tn, "dmacc", 5) == 0))
{
min_nops = 1;
}
/* Errata 24 - MT{LO,HI} after [D]MACC */
if (strcmp (tn, "mtlo") == 0
|| strcmp (tn, "mthi") == 0)
{
min_nops = 1;
}
}
else if (strncmp(pn, "dmult", 5) == 0
&& (strncmp(tn, "dmult", 5) == 0
|| strncmp(tn, "dmacc", 5) == 0))
{
/* Here is the rest of errata 23. */
min_nops = 1;
}
if (nops < min_nops)
nops = min_nops;
}
/* If we are being given a nop instruction, don't bother with
one of the nops we would otherwise output. This will only
happen when a nop instruction is used with mips_optimize set
to 0. */
if (nops > 0
&& ! mips_opts.noreorder
&& ip->insn_opcode == (unsigned) (mips_opts.mips16 ? 0x6500 : 0))
--nops;
/* Now emit the right number of NOP instructions. */
if (nops > 0 && ! mips_opts.noreorder)
{
fragS *old_frag;
unsigned long old_frag_offset;
int i;
struct insn_label_list *l;
old_frag = frag_now;
old_frag_offset = frag_now_fix ();
for (i = 0; i < nops; i++)
emit_nop ();
if (listing)
{
listing_prev_line ();
/* We may be at the start of a variant frag. In case we
are, make sure there is enough space for the frag
after the frags created by listing_prev_line. The
argument to frag_grow here must be at least as large
as the argument to all other calls to frag_grow in
this file. We don't have to worry about being in the
middle of a variant frag, because the variants insert
all needed nop instructions themselves. */
frag_grow (40);
}
for (l = insn_labels; l != NULL; l = l->next)
{
valueT val;
assert (S_GET_SEGMENT (l->label) == now_seg);
symbol_set_frag (l->label, frag_now);
val = (valueT) frag_now_fix ();
/* mips16 text labels are stored as odd. */
if (mips_opts.mips16)
++val;
S_SET_VALUE (l->label, val);
}
#ifndef NO_ECOFF_DEBUGGING
if (ECOFF_DEBUGGING)
ecoff_fix_loc (old_frag, old_frag_offset);
#endif
}
else if (prev_nop_frag != NULL)
{
/* We have a frag holding nops we may be able to remove. If
we don't need any nops, we can decrease the size of
prev_nop_frag by the size of one instruction. If we do
need some nops, we count them in prev_nops_required. */
if (prev_nop_frag_since == 0)
{
if (nops == 0)
{
prev_nop_frag->fr_fix -= mips_opts.mips16 ? 2 : 4;
--prev_nop_frag_holds;
}
else
prev_nop_frag_required += nops;
}
else
{
if (prev_prev_nop == 0)
{
prev_nop_frag->fr_fix -= mips_opts.mips16 ? 2 : 4;
--prev_nop_frag_holds;
}
else
++prev_nop_frag_required;
}
if (prev_nop_frag_holds <= prev_nop_frag_required)
prev_nop_frag = NULL;
++prev_nop_frag_since;
/* Sanity check: by the time we reach the second instruction
after prev_nop_frag, we should have used up all the nops
one way or another. */
assert (prev_nop_frag_since <= 1 || prev_nop_frag == NULL);
}
}
/* Record the frag type before frag_var. */
if (prev_insn_frag)
prev_insn_frag_type = prev_insn_frag->fr_type;
if (address_expr
&& *reloc_type == BFD_RELOC_16_PCREL_S2
&& (pinfo & INSN_UNCOND_BRANCH_DELAY || pinfo & INSN_COND_BRANCH_DELAY
|| pinfo & INSN_COND_BRANCH_LIKELY)
&& mips_relax_branch
/* Don't try branch relaxation within .set nomacro, or within
.set noat if we use $at for PIC computations. If it turns
out that the branch was out-of-range, we'll get an error. */
&& !mips_opts.warn_about_macros
&& !(mips_opts.noat && mips_pic != NO_PIC)
&& !mips_opts.mips16)
{
relaxed_branch = TRUE;
f = frag_var (rs_machine_dependent,
relaxed_branch_length
(NULL, NULL,
(pinfo & INSN_UNCOND_BRANCH_DELAY) ? -1
: (pinfo & INSN_COND_BRANCH_LIKELY) ? 1 : 0), 4,
RELAX_BRANCH_ENCODE
(pinfo & INSN_UNCOND_BRANCH_DELAY,
pinfo & INSN_COND_BRANCH_LIKELY,
pinfo & INSN_WRITE_GPR_31,
0),
address_expr->X_add_symbol,
address_expr->X_add_number,
0);
*reloc_type = BFD_RELOC_UNUSED;
}
else if (*reloc_type > BFD_RELOC_UNUSED)
{
/* We need to set up a variant frag. */
assert (mips_opts.mips16 && address_expr != NULL);
f = frag_var (rs_machine_dependent, 4, 0,
RELAX_MIPS16_ENCODE (*reloc_type - BFD_RELOC_UNUSED,
mips16_small, mips16_ext,
(prev_pinfo
& INSN_UNCOND_BRANCH_DELAY),
(*prev_insn_reloc_type
== BFD_RELOC_MIPS16_JMP)),
make_expr_symbol (address_expr), 0, NULL);
}
else if (mips_opts.mips16
&& ! ip->use_extend
&& *reloc_type != BFD_RELOC_MIPS16_JMP)
{
/* Make sure there is enough room to swap this instruction with
a following jump instruction. */
frag_grow (6);
f = frag_more (2);
}
else
{
if (mips_opts.mips16
&& mips_opts.noreorder
&& (prev_pinfo & INSN_UNCOND_BRANCH_DELAY) != 0)
as_warn (_("extended instruction in delay slot"));
if (mips_relax.sequence)
{
/* If we've reached the end of this frag, turn it into a variant
frag and record the information for the instructions we've
written so far. */
if (frag_room () < 4)
relax_close_frag ();
mips_relax.sizes[mips_relax.sequence - 1] += 4;
}
if (mips_relax.sequence != 2)
mips_macro_warning.sizes[0] += 4;
if (mips_relax.sequence != 1)
mips_macro_warning.sizes[1] += 4;
f = frag_more (4);
}
fixp[0] = fixp[1] = fixp[2] = NULL;
if (address_expr != NULL && *reloc_type < BFD_RELOC_UNUSED)
{
if (address_expr->X_op == O_constant)
{
valueT tmp;
switch (*reloc_type)
{
case BFD_RELOC_32:
ip->insn_opcode |= address_expr->X_add_number;
break;
case BFD_RELOC_MIPS_HIGHEST:
tmp = (address_expr->X_add_number
+ ((valueT) 0x8000 << 32) + 0x80008000) >> 16;
tmp >>= 16;
ip->insn_opcode |= (tmp >> 16) & 0xffff;
break;
case BFD_RELOC_MIPS_HIGHER:
tmp = (address_expr->X_add_number + 0x80008000) >> 16;
ip->insn_opcode |= (tmp >> 16) & 0xffff;
break;
case BFD_RELOC_HI16_S:
ip->insn_opcode |= ((address_expr->X_add_number + 0x8000)
>> 16) & 0xffff;
break;
case BFD_RELOC_HI16:
ip->insn_opcode |= (address_expr->X_add_number >> 16) & 0xffff;
break;
case BFD_RELOC_LO16:
case BFD_RELOC_MIPS_GOT_DISP:
ip->insn_opcode |= address_expr->X_add_number & 0xffff;
break;
case BFD_RELOC_MIPS_JMP:
if ((address_expr->X_add_number & 3) != 0)
as_bad (_("jump to misaligned address (0x%lx)"),
(unsigned long) address_expr->X_add_number);
if (address_expr->X_add_number & ~0xfffffff)
as_bad (_("jump address range overflow (0x%lx)"),
(unsigned long) address_expr->X_add_number);
ip->insn_opcode |= (address_expr->X_add_number >> 2) & 0x3ffffff;
break;
case BFD_RELOC_MIPS16_JMP:
if ((address_expr->X_add_number & 3) != 0)
as_bad (_("jump to misaligned address (0x%lx)"),
(unsigned long) address_expr->X_add_number);
if (address_expr->X_add_number & ~0xfffffff)
as_bad (_("jump address range overflow (0x%lx)"),
(unsigned long) address_expr->X_add_number);
ip->insn_opcode |=
(((address_expr->X_add_number & 0x7c0000) << 3)
| ((address_expr->X_add_number & 0xf800000) >> 7)
| ((address_expr->X_add_number & 0x3fffc) >> 2));
break;
case BFD_RELOC_16_PCREL_S2:
goto need_reloc;
default:
internalError ();
}
}
else
need_reloc:
{
reloc_howto_type *howto;
int i;
/* In a compound relocation, it is the final (outermost)
operator that determines the relocated field. */
for (i = 1; i < 3; i++)
if (reloc_type[i] == BFD_RELOC_UNUSED)
break;
howto = bfd_reloc_type_lookup (stdoutput, reloc_type[i - 1]);
fixp[0] = fix_new_exp (frag_now, f - frag_now->fr_literal,
bfd_get_reloc_size(howto),
address_expr,
reloc_type[0] == BFD_RELOC_16_PCREL_S2,
reloc_type[0]);
/* These relocations can have an addend that won't fit in
4 octets for 64bit assembly. */
if (HAVE_64BIT_GPRS
&& ! howto->partial_inplace
&& (reloc_type[0] == BFD_RELOC_16
|| reloc_type[0] == BFD_RELOC_32
|| reloc_type[0] == BFD_RELOC_MIPS_JMP
|| reloc_type[0] == BFD_RELOC_HI16_S
|| reloc_type[0] == BFD_RELOC_LO16
|| reloc_type[0] == BFD_RELOC_GPREL16
|| reloc_type[0] == BFD_RELOC_MIPS_LITERAL
|| reloc_type[0] == BFD_RELOC_GPREL32
|| reloc_type[0] == BFD_RELOC_64
|| reloc_type[0] == BFD_RELOC_CTOR
|| reloc_type[0] == BFD_RELOC_MIPS_SUB
|| reloc_type[0] == BFD_RELOC_MIPS_HIGHEST
|| reloc_type[0] == BFD_RELOC_MIPS_HIGHER
|| reloc_type[0] == BFD_RELOC_MIPS_SCN_DISP
|| reloc_type[0] == BFD_RELOC_MIPS_REL16
|| reloc_type[0] == BFD_RELOC_MIPS_RELGOT))
fixp[0]->fx_no_overflow = 1;
if (mips_relax.sequence)
{
if (mips_relax.first_fixup == 0)
mips_relax.first_fixup = fixp[0];
}
else if (reloc_needs_lo_p (*reloc_type))
{
struct mips_hi_fixup *hi_fixup;
/* Reuse the last entry if it already has a matching %lo. */
hi_fixup = mips_hi_fixup_list;
if (hi_fixup == 0
|| !fixup_has_matching_lo_p (hi_fixup->fixp))
{
hi_fixup = ((struct mips_hi_fixup *)
xmalloc (sizeof (struct mips_hi_fixup)));
hi_fixup->next = mips_hi_fixup_list;
mips_hi_fixup_list = hi_fixup;
}
hi_fixup->fixp = fixp[0];
hi_fixup->seg = now_seg;
}
/* Add fixups for the second and third relocations, if given.
Note that the ABI allows the second relocation to be
against RSS_UNDEF, RSS_GP, RSS_GP0 or RSS_LOC. At the
moment we only use RSS_UNDEF, but we could add support
for the others if it ever becomes necessary. */
for (i = 1; i < 3; i++)
if (reloc_type[i] != BFD_RELOC_UNUSED)
{
address_expr->X_op = O_absent;
address_expr->X_add_symbol = 0;
address_expr->X_add_number = 0;
fixp[i] = fix_new_exp (frag_now, fixp[0]->fx_where,
fixp[0]->fx_size, address_expr,
FALSE, reloc_type[i]);
}
}
}
if (! mips_opts.mips16)
{
md_number_to_chars (f, ip->insn_opcode, 4);
#ifdef OBJ_ELF
dwarf2_emit_insn (4);
#endif
}
else if (*reloc_type == BFD_RELOC_MIPS16_JMP)
{
md_number_to_chars (f, ip->insn_opcode >> 16, 2);
md_number_to_chars (f + 2, ip->insn_opcode & 0xffff, 2);
#ifdef OBJ_ELF
dwarf2_emit_insn (4);
#endif
}
else
{
if (ip->use_extend)
{
md_number_to_chars (f, 0xf000 | ip->extend, 2);
f += 2;
}
md_number_to_chars (f, ip->insn_opcode, 2);
#ifdef OBJ_ELF
dwarf2_emit_insn (ip->use_extend ? 4 : 2);
#endif
}
/* Update the register mask information. */
if (! mips_opts.mips16)
{
if (pinfo & INSN_WRITE_GPR_D)
mips_gprmask |= 1 << ((ip->insn_opcode >> OP_SH_RD) & OP_MASK_RD);
if ((pinfo & (INSN_WRITE_GPR_T | INSN_READ_GPR_T)) != 0)
mips_gprmask |= 1 << ((ip->insn_opcode >> OP_SH_RT) & OP_MASK_RT);
if (pinfo & INSN_READ_GPR_S)
mips_gprmask |= 1 << ((ip->insn_opcode >> OP_SH_RS) & OP_MASK_RS);
if (pinfo & INSN_WRITE_GPR_31)
mips_gprmask |= 1 << RA;
if (pinfo & INSN_WRITE_FPR_D)
mips_cprmask[1] |= 1 << ((ip->insn_opcode >> OP_SH_FD) & OP_MASK_FD);
if ((pinfo & (INSN_WRITE_FPR_S | INSN_READ_FPR_S)) != 0)
mips_cprmask[1] |= 1 << ((ip->insn_opcode >> OP_SH_FS) & OP_MASK_FS);
if ((pinfo & (INSN_WRITE_FPR_T | INSN_READ_FPR_T)) != 0)
mips_cprmask[1] |= 1 << ((ip->insn_opcode >> OP_SH_FT) & OP_MASK_FT);
if ((pinfo & INSN_READ_FPR_R) != 0)
mips_cprmask[1] |= 1 << ((ip->insn_opcode >> OP_SH_FR) & OP_MASK_FR);
if (pinfo & INSN_COP)
{
/* We don't keep enough information to sort these cases out.
The itbl support does keep this information however, although
we currently don't support itbl fprmats as part of the cop
instruction. May want to add this support in the future. */
}
/* Never set the bit for $0, which is always zero. */
mips_gprmask &= ~1 << 0;
}
else
{
if (pinfo & (MIPS16_INSN_WRITE_X | MIPS16_INSN_READ_X))
mips_gprmask |= 1 << ((ip->insn_opcode >> MIPS16OP_SH_RX)
& MIPS16OP_MASK_RX);
if (pinfo & (MIPS16_INSN_WRITE_Y | MIPS16_INSN_READ_Y))
mips_gprmask |= 1 << ((ip->insn_opcode >> MIPS16OP_SH_RY)
& MIPS16OP_MASK_RY);
if (pinfo & MIPS16_INSN_WRITE_Z)
mips_gprmask |= 1 << ((ip->insn_opcode >> MIPS16OP_SH_RZ)
& MIPS16OP_MASK_RZ);
if (pinfo & (MIPS16_INSN_WRITE_T | MIPS16_INSN_READ_T))
mips_gprmask |= 1 << TREG;
if (pinfo & (MIPS16_INSN_WRITE_SP | MIPS16_INSN_READ_SP))
mips_gprmask |= 1 << SP;
if (pinfo & (MIPS16_INSN_WRITE_31 | MIPS16_INSN_READ_31))
mips_gprmask |= 1 << RA;
if (pinfo & MIPS16_INSN_WRITE_GPR_Y)
mips_gprmask |= 1 << MIPS16OP_EXTRACT_REG32R (ip->insn_opcode);
if (pinfo & MIPS16_INSN_READ_Z)
mips_gprmask |= 1 << ((ip->insn_opcode >> MIPS16OP_SH_MOVE32Z)
& MIPS16OP_MASK_MOVE32Z);
if (pinfo & MIPS16_INSN_READ_GPR_X)
mips_gprmask |= 1 << ((ip->insn_opcode >> MIPS16OP_SH_REGR32)
& MIPS16OP_MASK_REGR32);
}
if (mips_relax.sequence != 2 && !mips_opts.noreorder)
{
/* Filling the branch delay slot is more complex. We try to
switch the branch with the previous instruction, which we can
do if the previous instruction does not set up a condition
that the branch tests and if the branch is not itself the
target of any branch. */
if ((pinfo & INSN_UNCOND_BRANCH_DELAY)
|| (pinfo & INSN_COND_BRANCH_DELAY))
{
if (mips_optimize < 2
/* If we have seen .set volatile or .set nomove, don't
optimize. */
|| mips_opts.nomove != 0
/* If we had to emit any NOP instructions, then we
already know we can not swap. */
|| nops != 0
/* If we don't even know the previous insn, we can not
swap. */
|| ! prev_insn_valid
/* If the previous insn is already in a branch delay
slot, then we can not swap. */
|| prev_insn_is_delay_slot
/* If the previous previous insn was in a .set
noreorder, we can't swap. Actually, the MIPS
assembler will swap in this situation. However, gcc
configured -with-gnu-as will generate code like
.set noreorder
lw $4,XXX
.set reorder
INSN
bne $4,$0,foo
in which we can not swap the bne and INSN. If gcc is
not configured -with-gnu-as, it does not output the
.set pseudo-ops. We don't have to check
prev_insn_unreordered, because prev_insn_valid will
be 0 in that case. We don't want to use
prev_prev_insn_valid, because we do want to be able
to swap at the start of a function. */
|| prev_prev_insn_unreordered
/* If the branch is itself the target of a branch, we
can not swap. We cheat on this; all we check for is
whether there is a label on this instruction. If
there are any branches to anything other than a
label, users must use .set noreorder. */
|| insn_labels != NULL
/* If the previous instruction is in a variant frag
other than this branch's one, we cannot do the swap.
This does not apply to the mips16, which uses variant
frags for different purposes. */
|| (! mips_opts.mips16
&& prev_insn_frag_type == rs_machine_dependent)
/* If the branch reads the condition codes, we don't
even try to swap, because in the sequence
ctc1 $X,$31
INSN
INSN
bc1t LABEL
we can not swap, and I don't feel like handling that
case. */
|| (! mips_opts.mips16
&& (pinfo & INSN_READ_COND_CODE)
&& ! cop_interlocks)
/* We can not swap with an instruction that requires a
delay slot, because the target of the branch might
interfere with that instruction. */
|| (! mips_opts.mips16
&& (prev_pinfo
/* Itbl support may require additional care here. */
& (INSN_LOAD_COPROC_DELAY
| INSN_COPROC_MOVE_DELAY
| INSN_WRITE_COND_CODE))
&& ! cop_interlocks)
|| (! (hilo_interlocks
|| (mips_opts.arch == CPU_R3900 && (pinfo & INSN_MULT)))
&& (prev_pinfo
& (INSN_READ_LO
| INSN_READ_HI)))
|| (! mips_opts.mips16
&& (prev_pinfo & INSN_LOAD_MEMORY_DELAY)
&& ! gpr_interlocks)
|| (! mips_opts.mips16
/* Itbl support may require additional care here. */
&& (prev_pinfo & INSN_COPROC_MEMORY_DELAY)
&& ! cop_mem_interlocks)
/* We can not swap with a branch instruction. */
|| (prev_pinfo
& (INSN_UNCOND_BRANCH_DELAY
| INSN_COND_BRANCH_DELAY
| INSN_COND_BRANCH_LIKELY))
/* We do not swap with a trap instruction, since it
complicates trap handlers to have the trap
instruction be in a delay slot. */
|| (prev_pinfo & INSN_TRAP)
/* If the branch reads a register that the previous
instruction sets, we can not swap. */
|| (! mips_opts.mips16
&& (prev_pinfo & INSN_WRITE_GPR_T)
&& insn_uses_reg (ip,
((prev_insn.insn_opcode >> OP_SH_RT)
& OP_MASK_RT),
MIPS_GR_REG))
|| (! mips_opts.mips16
&& (prev_pinfo & INSN_WRITE_GPR_D)
&& insn_uses_reg (ip,
((prev_insn.insn_opcode >> OP_SH_RD)
& OP_MASK_RD),
MIPS_GR_REG))
|| (mips_opts.mips16
&& (((prev_pinfo & MIPS16_INSN_WRITE_X)
&& insn_uses_reg (ip,
((prev_insn.insn_opcode
>> MIPS16OP_SH_RX)
& MIPS16OP_MASK_RX),
MIPS16_REG))
|| ((prev_pinfo & MIPS16_INSN_WRITE_Y)
&& insn_uses_reg (ip,
((prev_insn.insn_opcode
>> MIPS16OP_SH_RY)
& MIPS16OP_MASK_RY),
MIPS16_REG))
|| ((prev_pinfo & MIPS16_INSN_WRITE_Z)
&& insn_uses_reg (ip,
((prev_insn.insn_opcode
>> MIPS16OP_SH_RZ)
& MIPS16OP_MASK_RZ),
MIPS16_REG))
|| ((prev_pinfo & MIPS16_INSN_WRITE_T)
&& insn_uses_reg (ip, TREG, MIPS_GR_REG))
|| ((prev_pinfo & MIPS16_INSN_WRITE_31)
&& insn_uses_reg (ip, RA, MIPS_GR_REG))
|| ((prev_pinfo & MIPS16_INSN_WRITE_GPR_Y)
&& insn_uses_reg (ip,
MIPS16OP_EXTRACT_REG32R (prev_insn.
insn_opcode),
MIPS_GR_REG))))
/* If the branch writes a register that the previous
instruction sets, we can not swap (we know that
branches write only to RD or to $31). */
|| (! mips_opts.mips16
&& (prev_pinfo & INSN_WRITE_GPR_T)
&& (((pinfo & INSN_WRITE_GPR_D)
&& (((prev_insn.insn_opcode >> OP_SH_RT) & OP_MASK_RT)
== ((ip->insn_opcode >> OP_SH_RD) & OP_MASK_RD)))
|| ((pinfo & INSN_WRITE_GPR_31)
&& (((prev_insn.insn_opcode >> OP_SH_RT)
& OP_MASK_RT)
== RA))))
|| (! mips_opts.mips16
&& (prev_pinfo & INSN_WRITE_GPR_D)
&& (((pinfo & INSN_WRITE_GPR_D)
&& (((prev_insn.insn_opcode >> OP_SH_RD) & OP_MASK_RD)
== ((ip->insn_opcode >> OP_SH_RD) & OP_MASK_RD)))
|| ((pinfo & INSN_WRITE_GPR_31)
&& (((prev_insn.insn_opcode >> OP_SH_RD)
& OP_MASK_RD)
== RA))))
|| (mips_opts.mips16
&& (pinfo & MIPS16_INSN_WRITE_31)
&& ((prev_pinfo & MIPS16_INSN_WRITE_31)
|| ((prev_pinfo & MIPS16_INSN_WRITE_GPR_Y)
&& (MIPS16OP_EXTRACT_REG32R (prev_insn.insn_opcode)
== RA))))
/* If the branch writes a register that the previous
instruction reads, we can not swap (we know that
branches only write to RD or to $31). */
|| (! mips_opts.mips16
&& (pinfo & INSN_WRITE_GPR_D)
&& insn_uses_reg (&prev_insn,
((ip->insn_opcode >> OP_SH_RD)
& OP_MASK_RD),
MIPS_GR_REG))
|| (! mips_opts.mips16
&& (pinfo & INSN_WRITE_GPR_31)
&& insn_uses_reg (&prev_insn, RA, MIPS_GR_REG))
|| (mips_opts.mips16
&& (pinfo & MIPS16_INSN_WRITE_31)
&& insn_uses_reg (&prev_insn, RA, MIPS_GR_REG))
/* If the previous previous instruction has a load
delay, and sets a register that the branch reads, we
can not swap. */
|| (! mips_opts.mips16
/* Itbl support may require additional care here. */
&& (((prev_prev_insn.insn_mo->pinfo & INSN_LOAD_COPROC_DELAY)
&& ! cop_interlocks)
|| ((prev_prev_insn.insn_mo->pinfo
& INSN_LOAD_MEMORY_DELAY)
&& ! gpr_interlocks))
&& insn_uses_reg (ip,
((prev_prev_insn.insn_opcode >> OP_SH_RT)
& OP_MASK_RT),
MIPS_GR_REG))
/* If one instruction sets a condition code and the
other one uses a condition code, we can not swap. */
|| ((pinfo & INSN_READ_COND_CODE)
&& (prev_pinfo & INSN_WRITE_COND_CODE))
|| ((pinfo & INSN_WRITE_COND_CODE)
&& (prev_pinfo & INSN_READ_COND_CODE))
/* If the previous instruction uses the PC, we can not
swap. */
|| (mips_opts.mips16
&& (prev_pinfo & MIPS16_INSN_READ_PC))
/* If the previous instruction was extended, we can not
swap. */
|| (mips_opts.mips16 && prev_insn_extended)
/* If the previous instruction had a fixup in mips16
mode, we can not swap. This normally means that the
previous instruction was a 4 byte branch anyhow. */
|| (mips_opts.mips16 && prev_insn_fixp[0])
/* If the previous instruction is a sync, sync.l, or
sync.p, we can not swap. */
|| (prev_pinfo & INSN_SYNC))
{
/* We could do even better for unconditional branches to
portions of this object file; we could pick up the
instruction at the destination, put it in the delay
slot, and bump the destination address. */
emit_nop ();
/* Update the previous insn information. */
prev_prev_insn = *ip;
prev_insn.insn_mo = &dummy_opcode;
}
else
{
/* It looks like we can actually do the swap. */
if (! mips_opts.mips16)
{
char *prev_f;
char temp[4];
prev_f = prev_insn_frag->fr_literal + prev_insn_where;
if (!relaxed_branch)
{
/* If this is not a relaxed branch, then just
swap the instructions. */
memcpy (temp, prev_f, 4);
memcpy (prev_f, f, 4);
memcpy (f, temp, 4);
}
else
{
/* If this is a relaxed branch, then we move the
instruction to be placed in the delay slot to
the current frag, shrinking the fixed part of
the originating frag. If the branch occupies
the tail of the latter, we move it backwards,
into the space freed by the moved instruction. */
f = frag_more (4);
memcpy (f, prev_f, 4);
prev_insn_frag->fr_fix -= 4;
if (prev_insn_frag->fr_type == rs_machine_dependent)
memmove (prev_f, prev_f + 4, prev_insn_frag->fr_var);
}
if (prev_insn_fixp[0])
{
prev_insn_fixp[0]->fx_frag = frag_now;
prev_insn_fixp[0]->fx_where = f - frag_now->fr_literal;
}
if (prev_insn_fixp[1])
{
prev_insn_fixp[1]->fx_frag = frag_now;
prev_insn_fixp[1]->fx_where = f - frag_now->fr_literal;
}
if (prev_insn_fixp[2])
{
prev_insn_fixp[2]->fx_frag = frag_now;
prev_insn_fixp[2]->fx_where = f - frag_now->fr_literal;
}
if (prev_insn_fixp[0] && HAVE_NEWABI
&& prev_insn_frag != frag_now
&& (prev_insn_fixp[0]->fx_r_type
== BFD_RELOC_MIPS_GOT_DISP
|| (prev_insn_fixp[0]->fx_r_type
== BFD_RELOC_MIPS_CALL16)))
{
/* To avoid confusion in tc_gen_reloc, we must
ensure that this does not become a variant
frag. */
force_new_frag = TRUE;
}
if (!relaxed_branch)
{
if (fixp[0])
{
fixp[0]->fx_frag = prev_insn_frag;
fixp[0]->fx_where = prev_insn_where;
}
if (fixp[1])
{
fixp[1]->fx_frag = prev_insn_frag;
fixp[1]->fx_where = prev_insn_where;
}
if (fixp[2])
{
fixp[2]->fx_frag = prev_insn_frag;
fixp[2]->fx_where = prev_insn_where;
}
}
else if (prev_insn_frag->fr_type == rs_machine_dependent)
{
if (fixp[0])
fixp[0]->fx_where -= 4;
if (fixp[1])
fixp[1]->fx_where -= 4;
if (fixp[2])
fixp[2]->fx_where -= 4;
}
}
else
{
char *prev_f;
char temp[2];
assert (prev_insn_fixp[0] == NULL);
assert (prev_insn_fixp[1] == NULL);
assert (prev_insn_fixp[2] == NULL);
prev_f = prev_insn_frag->fr_literal + prev_insn_where;
memcpy (temp, prev_f, 2);
memcpy (prev_f, f, 2);
if (*reloc_type != BFD_RELOC_MIPS16_JMP)
{
assert (*reloc_type == BFD_RELOC_UNUSED);
memcpy (f, temp, 2);
}
else
{
memcpy (f, f + 2, 2);
memcpy (f + 2, temp, 2);
}
if (fixp[0])
{
fixp[0]->fx_frag = prev_insn_frag;
fixp[0]->fx_where = prev_insn_where;
}
if (fixp[1])
{
fixp[1]->fx_frag = prev_insn_frag;
fixp[1]->fx_where = prev_insn_where;
}
if (fixp[2])
{
fixp[2]->fx_frag = prev_insn_frag;
fixp[2]->fx_where = prev_insn_where;
}
}
/* Update the previous insn information; leave prev_insn
unchanged. */
prev_prev_insn = *ip;
}
prev_insn_is_delay_slot = 1;
/* If that was an unconditional branch, forget the previous
insn information. */
if (pinfo & INSN_UNCOND_BRANCH_DELAY)
{
prev_prev_insn.insn_mo = &dummy_opcode;
prev_insn.insn_mo = &dummy_opcode;
}
prev_insn_fixp[0] = NULL;
prev_insn_fixp[1] = NULL;
prev_insn_fixp[2] = NULL;
prev_insn_reloc_type[0] = BFD_RELOC_UNUSED;
prev_insn_reloc_type[1] = BFD_RELOC_UNUSED;
prev_insn_reloc_type[2] = BFD_RELOC_UNUSED;
prev_insn_extended = 0;
}
else if (pinfo & INSN_COND_BRANCH_LIKELY)
{
/* We don't yet optimize a branch likely. What we should do
is look at the target, copy the instruction found there
into the delay slot, and increment the branch to jump to
the next instruction. */
emit_nop ();
/* Update the previous insn information. */
prev_prev_insn = *ip;
prev_insn.insn_mo = &dummy_opcode;
prev_insn_fixp[0] = NULL;
prev_insn_fixp[1] = NULL;
prev_insn_fixp[2] = NULL;
prev_insn_reloc_type[0] = BFD_RELOC_UNUSED;
prev_insn_reloc_type[1] = BFD_RELOC_UNUSED;
prev_insn_reloc_type[2] = BFD_RELOC_UNUSED;
prev_insn_extended = 0;
}
else
{
/* Update the previous insn information. */
if (nops > 0)
prev_prev_insn.insn_mo = &dummy_opcode;
else
prev_prev_insn = prev_insn;
prev_insn = *ip;
/* Any time we see a branch, we always fill the delay slot
immediately; since this insn is not a branch, we know it
is not in a delay slot. */
prev_insn_is_delay_slot = 0;
prev_insn_fixp[0] = fixp[0];
prev_insn_fixp[1] = fixp[1];
prev_insn_fixp[2] = fixp[2];
prev_insn_reloc_type[0] = reloc_type[0];
prev_insn_reloc_type[1] = reloc_type[1];
prev_insn_reloc_type[2] = reloc_type[2];
if (mips_opts.mips16)
prev_insn_extended = (ip->use_extend
|| *reloc_type > BFD_RELOC_UNUSED);
}
prev_prev_insn_unreordered = prev_insn_unreordered;
prev_insn_unreordered = 0;
prev_insn_frag = frag_now;
prev_insn_where = f - frag_now->fr_literal;
prev_insn_valid = 1;
}
else if (mips_relax.sequence != 2)
{
/* We need to record a bit of information even when we are not
reordering, in order to determine the base address for mips16
PC relative relocs. */
prev_prev_insn = prev_insn;
prev_insn = *ip;
prev_insn_reloc_type[0] = reloc_type[0];
prev_insn_reloc_type[1] = reloc_type[1];
prev_insn_reloc_type[2] = reloc_type[2];
prev_prev_insn_unreordered = prev_insn_unreordered;
prev_insn_unreordered = 1;
}
/* We just output an insn, so the next one doesn't have a label. */
mips_clear_insn_labels ();
}
/* This function forgets that there was any previous instruction or
label. If PRESERVE is non-zero, it remembers enough information to
know whether nops are needed before a noreorder section. */
static void
mips_no_prev_insn (int preserve)
{
if (! preserve)
{
prev_insn.insn_mo = &dummy_opcode;
prev_prev_insn.insn_mo = &dummy_opcode;
prev_nop_frag = NULL;
prev_nop_frag_holds = 0;
prev_nop_frag_required = 0;
prev_nop_frag_since = 0;
}
prev_insn_valid = 0;
prev_insn_is_delay_slot = 0;
prev_insn_unreordered = 0;
prev_insn_extended = 0;
prev_insn_reloc_type[0] = BFD_RELOC_UNUSED;
prev_insn_reloc_type[1] = BFD_RELOC_UNUSED;
prev_insn_reloc_type[2] = BFD_RELOC_UNUSED;
prev_prev_insn_unreordered = 0;
mips_clear_insn_labels ();
}
/* This function must be called whenever we turn on noreorder or emit
something other than instructions. It inserts any NOPS which might
be needed by the previous instruction, and clears the information
kept for the previous instructions. The INSNS parameter is true if
instructions are to follow. */
static void
mips_emit_delays (bfd_boolean insns)
{
if (! mips_opts.noreorder)
{
int nops;
nops = 0;
if ((! mips_opts.mips16
&& ((prev_insn.insn_mo->pinfo
& (INSN_LOAD_COPROC_DELAY
| INSN_COPROC_MOVE_DELAY
| INSN_WRITE_COND_CODE))
&& ! cop_interlocks))
|| (! hilo_interlocks
&& (prev_insn.insn_mo->pinfo
& (INSN_READ_LO
| INSN_READ_HI)))
|| (! mips_opts.mips16
&& (prev_insn.insn_mo->pinfo & INSN_LOAD_MEMORY_DELAY)
&& ! gpr_interlocks)
|| (! mips_opts.mips16
&& (prev_insn.insn_mo->pinfo & INSN_COPROC_MEMORY_DELAY)
&& ! cop_mem_interlocks))
{
/* Itbl support may require additional care here. */
++nops;
if ((! mips_opts.mips16
&& ((prev_insn.insn_mo->pinfo & INSN_WRITE_COND_CODE)
&& ! cop_interlocks))
|| (! hilo_interlocks
&& ((prev_insn.insn_mo->pinfo & INSN_READ_HI)
|| (prev_insn.insn_mo->pinfo & INSN_READ_LO))))
++nops;
if (prev_insn_unreordered)
nops = 0;
}
else if ((! mips_opts.mips16
&& ((prev_prev_insn.insn_mo->pinfo & INSN_WRITE_COND_CODE)
&& ! cop_interlocks))
|| (! hilo_interlocks
&& ((prev_prev_insn.insn_mo->pinfo & INSN_READ_HI)
|| (prev_prev_insn.insn_mo->pinfo & INSN_READ_LO))))
{
/* Itbl support may require additional care here. */
if (! prev_prev_insn_unreordered)
++nops;
}
if (mips_fix_vr4120 && prev_insn.insn_mo->name)
{
int min_nops = 0;
const char *pn = prev_insn.insn_mo->name;
if (strncmp(pn, "macc", 4) == 0
|| strncmp(pn, "dmacc", 5) == 0
|| strncmp(pn, "dmult", 5) == 0)
{
min_nops = 1;
}
if (nops < min_nops)
nops = min_nops;
}
if (nops > 0)
{
struct insn_label_list *l;
if (insns)
{
/* Record the frag which holds the nop instructions, so
that we can remove them if we don't need them. */
frag_grow (mips_opts.mips16 ? nops * 2 : nops * 4);
prev_nop_frag = frag_now;
prev_nop_frag_holds = nops;
prev_nop_frag_required = 0;
prev_nop_frag_since = 0;
}
for (; nops > 0; --nops)
emit_nop ();
if (insns)
{
/* Move on to a new frag, so that it is safe to simply
decrease the size of prev_nop_frag. */
frag_wane (frag_now);
frag_new (0);
}
for (l = insn_labels; l != NULL; l = l->next)
{
valueT val;
assert (S_GET_SEGMENT (l->label) == now_seg);
symbol_set_frag (l->label, frag_now);
val = (valueT) frag_now_fix ();
/* mips16 text labels are stored as odd. */
if (mips_opts.mips16)
++val;
S_SET_VALUE (l->label, val);
}
}
}
/* Mark instruction labels in mips16 mode. */
if (insns)
mips16_mark_labels ();
mips_no_prev_insn (insns);
}
/* Set up global variables for the start of a new macro. */
static void
macro_start (void)
{
memset (&mips_macro_warning.sizes, 0, sizeof (mips_macro_warning.sizes));
mips_macro_warning.delay_slot_p = (mips_opts.noreorder
&& (prev_insn.insn_mo->pinfo
& (INSN_UNCOND_BRANCH_DELAY
| INSN_COND_BRANCH_DELAY
| INSN_COND_BRANCH_LIKELY)) != 0);
}
/* Given that a macro is longer than 4 bytes, return the appropriate warning
for it. Return null if no warning is needed. SUBTYPE is a bitmask of
RELAX_DELAY_SLOT and RELAX_NOMACRO. */
static const char *
macro_warning (relax_substateT subtype)
{
if (subtype & RELAX_DELAY_SLOT)
return _("Macro instruction expanded into multiple instructions"
" in a branch delay slot");
else if (subtype & RELAX_NOMACRO)
return _("Macro instruction expanded into multiple instructions");
else
return 0;
}
/* Finish up a macro. Emit warnings as appropriate. */
static void
macro_end (void)
{
if (mips_macro_warning.sizes[0] > 4 || mips_macro_warning.sizes[1] > 4)
{
relax_substateT subtype;
/* Set up the relaxation warning flags. */
subtype = 0;
if (mips_macro_warning.sizes[1] > mips_macro_warning.sizes[0])
subtype |= RELAX_SECOND_LONGER;
if (mips_opts.warn_about_macros)
subtype |= RELAX_NOMACRO;
if (mips_macro_warning.delay_slot_p)
subtype |= RELAX_DELAY_SLOT;
if (mips_macro_warning.sizes[0] > 4 && mips_macro_warning.sizes[1] > 4)
{
/* Either the macro has a single implementation or both
implementations are longer than 4 bytes. Emit the
warning now. */
const char *msg = macro_warning (subtype);
if (msg != 0)
as_warn (msg);
}
else
{
/* One implementation might need a warning but the other
definitely doesn't. */
mips_macro_warning.first_frag->fr_subtype |= subtype;
}
}
}
/* Build an instruction created by a macro expansion. This is passed
a pointer to the count of instructions created so far, an
expression, the name of the instruction to build, an operand format
string, and corresponding arguments. */
static void
macro_build (expressionS *ep, const char *name, const char *fmt, ...)
{
struct mips_cl_insn insn;
bfd_reloc_code_real_type r[3];
va_list args;
va_start (args, fmt);
if (mips_opts.mips16)
{
mips16_macro_build (ep, name, fmt, args);
va_end (args);
return;
}
r[0] = BFD_RELOC_UNUSED;
r[1] = BFD_RELOC_UNUSED;
r[2] = BFD_RELOC_UNUSED;
insn.insn_mo = (struct mips_opcode *) hash_find (op_hash, name);
assert (insn.insn_mo);
assert (strcmp (name, insn.insn_mo->name) == 0);
/* Search until we get a match for NAME. */
while (1)
{
/* It is assumed here that macros will never generate
MDMX or MIPS-3D instructions. */
if (strcmp (fmt, insn.insn_mo->args) == 0
&& insn.insn_mo->pinfo != INSN_MACRO
&& OPCODE_IS_MEMBER (insn.insn_mo,
(mips_opts.isa
| (file_ase_mips16 ? INSN_MIPS16 : 0)),
mips_opts.arch)
&& (mips_opts.arch != CPU_R4650 || (insn.insn_mo->pinfo & FP_D) == 0))
break;
++insn.insn_mo;
assert (insn.insn_mo->name);
assert (strcmp (name, insn.insn_mo->name) == 0);
}
insn.insn_opcode = insn.insn_mo->match;
for (;;)
{
switch (*fmt++)
{
case '\0':
break;
case ',':
case '(':
case ')':
continue;
case '+':
switch (*fmt++)
{
case 'A':
case 'E':
insn.insn_opcode |= (va_arg (args, int)
& OP_MASK_SHAMT) << OP_SH_SHAMT;
continue;
case 'B':
case 'F':
/* Note that in the macro case, these arguments are already
in MSB form. (When handling the instruction in the
non-macro case, these arguments are sizes from which
MSB values must be calculated.) */
insn.insn_opcode |= (va_arg (args, int)
& OP_MASK_INSMSB) << OP_SH_INSMSB;
continue;
case 'C':
case 'G':
case 'H':
/* Note that in the macro case, these arguments are already
in MSBD form. (When handling the instruction in the
non-macro case, these arguments are sizes from which
MSBD values must be calculated.) */
insn.insn_opcode |= (va_arg (args, int)
& OP_MASK_EXTMSBD) << OP_SH_EXTMSBD;
continue;
default:
internalError ();
}
continue;
case 't':
case 'w':
case 'E':
insn.insn_opcode |= va_arg (args, int) << OP_SH_RT;
continue;
case 'c':
insn.insn_opcode |= va_arg (args, int) << OP_SH_CODE;
continue;
case 'T':
case 'W':
insn.insn_opcode |= va_arg (args, int) << OP_SH_FT;
continue;
case 'd':
case 'G':
case 'K':
insn.insn_opcode |= va_arg (args, int) << OP_SH_RD;
continue;
case 'U':
{
int tmp = va_arg (args, int);
insn.insn_opcode |= tmp << OP_SH_RT;
insn.insn_opcode |= tmp << OP_SH_RD;
continue;
}
case 'V':
case 'S':
insn.insn_opcode |= va_arg (args, int) << OP_SH_FS;
continue;
case 'z':
continue;
case '<':
insn.insn_opcode |= va_arg (args, int) << OP_SH_SHAMT;
continue;
case 'D':
insn.insn_opcode |= va_arg (args, int) << OP_SH_FD;
continue;
case 'B':
insn.insn_opcode |= va_arg (args, int) << OP_SH_CODE20;
continue;
case 'J':
insn.insn_opcode |= va_arg (args, int) << OP_SH_CODE19;
continue;
case 'q':
insn.insn_opcode |= va_arg (args, int) << OP_SH_CODE2;
continue;
case 'b':
case 's':
case 'r':
case 'v':
insn.insn_opcode |= va_arg (args, int) << OP_SH_RS;
continue;
case 'i':
case 'j':
case 'o':
*r = (bfd_reloc_code_real_type) va_arg (args, int);
assert (*r == BFD_RELOC_GPREL16
|| *r == BFD_RELOC_MIPS_LITERAL
|| *r == BFD_RELOC_MIPS_HIGHER
|| *r == BFD_RELOC_HI16_S
|| *r == BFD_RELOC_LO16
|| *r == BFD_RELOC_MIPS_GOT16
|| *r == BFD_RELOC_MIPS_CALL16
|| *r == BFD_RELOC_MIPS_GOT_DISP
|| *r == BFD_RELOC_MIPS_GOT_PAGE
|| *r == BFD_RELOC_MIPS_GOT_OFST
|| *r == BFD_RELOC_MIPS_GOT_LO16
|| *r == BFD_RELOC_MIPS_CALL_LO16);
continue;
case 'u':
*r = (bfd_reloc_code_real_type) va_arg (args, int);
assert (ep != NULL
&& (ep->X_op == O_constant
|| (ep->X_op == O_symbol
&& (*r == BFD_RELOC_MIPS_HIGHEST
|| *r == BFD_RELOC_HI16_S
|| *r == BFD_RELOC_HI16
|| *r == BFD_RELOC_GPREL16
|| *r == BFD_RELOC_MIPS_GOT_HI16
|| *r == BFD_RELOC_MIPS_CALL_HI16))));
continue;
case 'p':
assert (ep != NULL);
/*
* This allows macro() to pass an immediate expression for
* creating short branches without creating a symbol.
* Note that the expression still might come from the assembly
* input, in which case the value is not checked for range nor
* is a relocation entry generated (yuck).
*/
if (ep->X_op == O_constant)
{
insn.insn_opcode |= (ep->X_add_number >> 2) & 0xffff;
ep = NULL;
}
else
*r = BFD_RELOC_16_PCREL_S2;
continue;
case 'a':
assert (ep != NULL);
*r = BFD_RELOC_MIPS_JMP;
continue;
case 'C':
insn.insn_opcode |= va_arg (args, unsigned long);
continue;
default:
internalError ();
}
break;
}
va_end (args);
assert (*r == BFD_RELOC_UNUSED ? ep == NULL : ep != NULL);
append_insn (&insn, ep, r);
}
static void
mips16_macro_build (expressionS *ep, const char *name, const char *fmt,
va_list args)
{
struct mips_cl_insn insn;
bfd_reloc_code_real_type r[3]
= {BFD_RELOC_UNUSED, BFD_RELOC_UNUSED, BFD_RELOC_UNUSED};
insn.insn_mo = (struct mips_opcode *) hash_find (mips16_op_hash, name);
assert (insn.insn_mo);
assert (strcmp (name, insn.insn_mo->name) == 0);
while (strcmp (fmt, insn.insn_mo->args) != 0
|| insn.insn_mo->pinfo == INSN_MACRO)
{
++insn.insn_mo;
assert (insn.insn_mo->name);
assert (strcmp (name, insn.insn_mo->name) == 0);
}
insn.insn_opcode = insn.insn_mo->match;
insn.use_extend = FALSE;
for (;;)
{
int c;
c = *fmt++;
switch (c)
{
case '\0':
break;
case ',':
case '(':
case ')':
continue;
case 'y':
case 'w':
insn.insn_opcode |= va_arg (args, int) << MIPS16OP_SH_RY;
continue;
case 'x':
case 'v':
insn.insn_opcode |= va_arg (args, int) << MIPS16OP_SH_RX;
continue;
case 'z':
insn.insn_opcode |= va_arg (args, int) << MIPS16OP_SH_RZ;
continue;
case 'Z':
insn.insn_opcode |= va_arg (args, int) << MIPS16OP_SH_MOVE32Z;
continue;
case '0':
case 'S':
case 'P':
case 'R':
continue;
case 'X':
insn.insn_opcode |= va_arg (args, int) << MIPS16OP_SH_REGR32;
continue;
case 'Y':
{
int regno;
regno = va_arg (args, int);
regno = ((regno & 7) << 2) | ((regno & 0x18) >> 3);
insn.insn_opcode |= regno << MIPS16OP_SH_REG32R;
}
continue;
case '<':
case '>':
case '4':
case '5':
case 'H':
case 'W':
case 'D':
case 'j':
case '8':
case 'V':
case 'C':
case 'U':
case 'k':
case 'K':
case 'p':
case 'q':
{
assert (ep != NULL);
if (ep->X_op != O_constant)
*r = (int) BFD_RELOC_UNUSED + c;
else
{
mips16_immed (NULL, 0, c, ep->X_add_number, FALSE, FALSE,
FALSE, &insn.insn_opcode, &insn.use_extend,
&insn.extend);
ep = NULL;
*r = BFD_RELOC_UNUSED;
}
}
continue;
case '6':
insn.insn_opcode |= va_arg (args, int) << MIPS16OP_SH_IMM6;
continue;
}
break;
}
assert (*r == BFD_RELOC_UNUSED ? ep == NULL : ep != NULL);
append_insn (&insn, ep, r);
}
/*
* Generate a "jalr" instruction with a relocation hint to the called
* function. This occurs in NewABI PIC code.
*/
static void
macro_build_jalr (expressionS *ep)
{
char *f = NULL;
if (HAVE_NEWABI)
{
frag_grow (8);
f = frag_more (0);
}
macro_build (NULL, "jalr", "d,s", RA, PIC_CALL_REG);
if (HAVE_NEWABI)
fix_new_exp (frag_now, f - frag_now->fr_literal,
4, ep, FALSE, BFD_RELOC_MIPS_JALR);
}
/*
* Generate a "lui" instruction.
*/
static void
macro_build_lui (expressionS *ep, int regnum)
{
expressionS high_expr;
struct mips_cl_insn insn;
bfd_reloc_code_real_type r[3]
= {BFD_RELOC_UNUSED, BFD_RELOC_UNUSED, BFD_RELOC_UNUSED};
const char *name = "lui";
const char *fmt = "t,u";
assert (! mips_opts.mips16);
high_expr = *ep;
if (high_expr.X_op == O_constant)
{
/* we can compute the instruction now without a relocation entry */
high_expr.X_add_number = ((high_expr.X_add_number + 0x8000)
>> 16) & 0xffff;
*r = BFD_RELOC_UNUSED;
}
else
{
assert (ep->X_op == O_symbol);
/* _gp_disp is a special case, used from s_cpload. */
assert (mips_pic == NO_PIC
|| (! HAVE_NEWABI
&& strcmp (S_GET_NAME (ep->X_add_symbol), "_gp_disp") == 0));
*r = BFD_RELOC_HI16_S;
}
insn.insn_mo = (struct mips_opcode *) hash_find (op_hash, name);
assert (insn.insn_mo);
assert (strcmp (name, insn.insn_mo->name) == 0);
assert (strcmp (fmt, insn.insn_mo->args) == 0);
insn.insn_opcode = insn.insn_mo->match | (regnum << OP_SH_RT);
if (*r == BFD_RELOC_UNUSED)
{
insn.insn_opcode |= high_expr.X_add_number;
append_insn (&insn, NULL, r);
}
else
append_insn (&insn, &high_expr, r);
}
/* Generate a sequence of instructions to do a load or store from a constant
offset off of a base register (breg) into/from a target register (treg),
using AT if necessary. */
static void
macro_build_ldst_constoffset (expressionS *ep, const char *op,
int treg, int breg, int dbl)
{
assert (ep->X_op == O_constant);
/* Sign-extending 32-bit constants makes their handling easier. */
if (! dbl && ! ((ep->X_add_number & ~((bfd_vma) 0x7fffffff))
== ~((bfd_vma) 0x7fffffff)))
{
if (ep->X_add_number & ~((bfd_vma) 0xffffffff))
as_bad (_("constant too large"));
ep->X_add_number = (((ep->X_add_number & 0xffffffff) ^ 0x80000000)
- 0x80000000);
}
/* Right now, this routine can only handle signed 32-bit constants. */
if (! IS_SEXT_32BIT_NUM(ep->X_add_number + 0x8000))
as_warn (_("operand overflow"));
if (IS_SEXT_16BIT_NUM(ep->X_add_number))
{
/* Signed 16-bit offset will fit in the op. Easy! */
macro_build (ep, op, "t,o(b)", treg, BFD_RELOC_LO16, breg);
}
else
{
/* 32-bit offset, need multiple instructions and AT, like:
lui $tempreg,const_hi (BFD_RELOC_HI16_S)
addu $tempreg,$tempreg,$breg
<op> $treg,const_lo($tempreg) (BFD_RELOC_LO16)
to handle the complete offset. */
macro_build_lui (ep, AT);
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", AT, AT, breg);
macro_build (ep, op, "t,o(b)", treg, BFD_RELOC_LO16, AT);
if (mips_opts.noat)
as_warn (_("Macro used $at after \".set noat\""));
}
}
/* set_at()
* Generates code to set the $at register to true (one)
* if reg is less than the immediate expression.
*/
static void
set_at (int reg, int unsignedp)
{
if (imm_expr.X_op == O_constant
&& imm_expr.X_add_number >= -0x8000
&& imm_expr.X_add_number < 0x8000)
macro_build (&imm_expr, unsignedp ? "sltiu" : "slti", "t,r,j",
AT, reg, BFD_RELOC_LO16);
else
{
load_register (AT, &imm_expr, HAVE_64BIT_GPRS);
macro_build (NULL, unsignedp ? "sltu" : "slt", "d,v,t", AT, reg, AT);
}
}
static void
normalize_constant_expr (expressionS *ex)
{
if (ex->X_op == O_constant && HAVE_32BIT_GPRS)
ex->X_add_number = (((ex->X_add_number & 0xffffffff) ^ 0x80000000)
- 0x80000000);
}
/* Warn if an expression is not a constant. */
static void
check_absolute_expr (struct mips_cl_insn *ip, expressionS *ex)
{
if (ex->X_op == O_big)
as_bad (_("unsupported large constant"));
else if (ex->X_op != O_constant)
as_bad (_("Instruction %s requires absolute expression"), ip->insn_mo->name);
normalize_constant_expr (ex);
}
/* Count the leading zeroes by performing a binary chop. This is a
bulky bit of source, but performance is a LOT better for the
majority of values than a simple loop to count the bits:
for (lcnt = 0; (lcnt < 32); lcnt++)
if ((v) & (1 << (31 - lcnt)))
break;
However it is not code size friendly, and the gain will drop a bit
on certain cached systems.
*/
#define COUNT_TOP_ZEROES(v) \
(((v) & ~0xffff) == 0 \
? ((v) & ~0xff) == 0 \
? ((v) & ~0xf) == 0 \
? ((v) & ~0x3) == 0 \
? ((v) & ~0x1) == 0 \
? !(v) \
? 32 \
: 31 \
: 30 \
: ((v) & ~0x7) == 0 \
? 29 \
: 28 \
: ((v) & ~0x3f) == 0 \
? ((v) & ~0x1f) == 0 \
? 27 \
: 26 \
: ((v) & ~0x7f) == 0 \
? 25 \
: 24 \
: ((v) & ~0xfff) == 0 \
? ((v) & ~0x3ff) == 0 \
? ((v) & ~0x1ff) == 0 \
? 23 \
: 22 \
: ((v) & ~0x7ff) == 0 \
? 21 \
: 20 \
: ((v) & ~0x3fff) == 0 \
? ((v) & ~0x1fff) == 0 \
? 19 \
: 18 \
: ((v) & ~0x7fff) == 0 \
? 17 \
: 16 \
: ((v) & ~0xffffff) == 0 \
? ((v) & ~0xfffff) == 0 \
? ((v) & ~0x3ffff) == 0 \
? ((v) & ~0x1ffff) == 0 \
? 15 \
: 14 \
: ((v) & ~0x7ffff) == 0 \
? 13 \
: 12 \
: ((v) & ~0x3fffff) == 0 \
? ((v) & ~0x1fffff) == 0 \
? 11 \
: 10 \
: ((v) & ~0x7fffff) == 0 \
? 9 \
: 8 \
: ((v) & ~0xfffffff) == 0 \
? ((v) & ~0x3ffffff) == 0 \
? ((v) & ~0x1ffffff) == 0 \
? 7 \
: 6 \
: ((v) & ~0x7ffffff) == 0 \
? 5 \
: 4 \
: ((v) & ~0x3fffffff) == 0 \
? ((v) & ~0x1fffffff) == 0 \
? 3 \
: 2 \
: ((v) & ~0x7fffffff) == 0 \
? 1 \
: 0)
/* load_register()
* This routine generates the least number of instructions necessary to load
* an absolute expression value into a register.
*/
static void
load_register (int reg, expressionS *ep, int dbl)
{
int freg;
expressionS hi32, lo32;
if (ep->X_op != O_big)
{
assert (ep->X_op == O_constant);
/* Sign-extending 32-bit constants makes their handling easier. */
if (! dbl && ! ((ep->X_add_number & ~((bfd_vma) 0x7fffffff))
== ~((bfd_vma) 0x7fffffff)))
{
if (ep->X_add_number & ~((bfd_vma) 0xffffffff))
as_bad (_("constant too large"));
ep->X_add_number = (((ep->X_add_number & 0xffffffff) ^ 0x80000000)
- 0x80000000);
}
if (IS_SEXT_16BIT_NUM (ep->X_add_number))
{
/* We can handle 16 bit signed values with an addiu to
$zero. No need to ever use daddiu here, since $zero and
the result are always correct in 32 bit mode. */
macro_build (ep, "addiu", "t,r,j", reg, 0, BFD_RELOC_LO16);
return;
}
else if (ep->X_add_number >= 0 && ep->X_add_number < 0x10000)
{
/* We can handle 16 bit unsigned values with an ori to
$zero. */
macro_build (ep, "ori", "t,r,i", reg, 0, BFD_RELOC_LO16);
return;
}
else if ((IS_SEXT_32BIT_NUM (ep->X_add_number)))
{
/* 32 bit values require an lui. */
macro_build (ep, "lui", "t,u", reg, BFD_RELOC_HI16);
if ((ep->X_add_number & 0xffff) != 0)
macro_build (ep, "ori", "t,r,i", reg, reg, BFD_RELOC_LO16);
return;
}
}
/* The value is larger than 32 bits. */
if (HAVE_32BIT_GPRS)
{
as_bad (_("Number (0x%lx) larger than 32 bits"),
(unsigned long) ep->X_add_number);
macro_build (ep, "addiu", "t,r,j", reg, 0, BFD_RELOC_LO16);
return;
}
if (ep->X_op != O_big)
{
hi32 = *ep;
hi32.X_add_number = (valueT) hi32.X_add_number >> 16;
hi32.X_add_number = (valueT) hi32.X_add_number >> 16;
hi32.X_add_number &= 0xffffffff;
lo32 = *ep;
lo32.X_add_number &= 0xffffffff;
}
else
{
assert (ep->X_add_number > 2);
if (ep->X_add_number == 3)
generic_bignum[3] = 0;
else if (ep->X_add_number > 4)
as_bad (_("Number larger than 64 bits"));
lo32.X_op = O_constant;
lo32.X_add_number = generic_bignum[0] + (generic_bignum[1] << 16);
hi32.X_op = O_constant;
hi32.X_add_number = generic_bignum[2] + (generic_bignum[3] << 16);
}
if (hi32.X_add_number == 0)
freg = 0;
else
{
int shift, bit;
unsigned long hi, lo;
if (hi32.X_add_number == (offsetT) 0xffffffff)
{
if ((lo32.X_add_number & 0xffff8000) == 0xffff8000)
{
macro_build (&lo32, "addiu", "t,r,j", reg, 0, BFD_RELOC_LO16);
return;
}
if (lo32.X_add_number & 0x80000000)
{
macro_build (&lo32, "lui", "t,u", reg, BFD_RELOC_HI16);
if (lo32.X_add_number & 0xffff)
macro_build (&lo32, "ori", "t,r,i", reg, reg, BFD_RELOC_LO16);
return;
}
}
/* Check for 16bit shifted constant. We know that hi32 is
non-zero, so start the mask on the first bit of the hi32
value. */
shift = 17;
do
{
unsigned long himask, lomask;
if (shift < 32)
{
himask = 0xffff >> (32 - shift);
lomask = (0xffff << shift) & 0xffffffff;
}
else
{
himask = 0xffff << (shift - 32);
lomask = 0;
}
if ((hi32.X_add_number & ~(offsetT) himask) == 0
&& (lo32.X_add_number & ~(offsetT) lomask) == 0)
{
expressionS tmp;
tmp.X_op = O_constant;
if (shift < 32)
tmp.X_add_number = ((hi32.X_add_number << (32 - shift))
| (lo32.X_add_number >> shift));
else
tmp.X_add_number = hi32.X_add_number >> (shift - 32);
macro_build (&tmp, "ori", "t,r,i", reg, 0, BFD_RELOC_LO16);
macro_build (NULL, (shift >= 32) ? "dsll32" : "dsll", "d,w,<",
reg, reg, (shift >= 32) ? shift - 32 : shift);
return;
}
++shift;
}
while (shift <= (64 - 16));
/* Find the bit number of the lowest one bit, and store the
shifted value in hi/lo. */
hi = (unsigned long) (hi32.X_add_number & 0xffffffff);
lo = (unsigned long) (lo32.X_add_number & 0xffffffff);
if (lo != 0)
{
bit = 0;
while ((lo & 1) == 0)
{
lo >>= 1;
++bit;
}
lo |= (hi & (((unsigned long) 1 << bit) - 1)) << (32 - bit);
hi >>= bit;
}
else
{
bit = 32;
while ((hi & 1) == 0)
{
hi >>= 1;
++bit;
}
lo = hi;
hi = 0;
}
/* Optimize if the shifted value is a (power of 2) - 1. */
if ((hi == 0 && ((lo + 1) & lo) == 0)
|| (lo == 0xffffffff && ((hi + 1) & hi) == 0))
{
shift = COUNT_TOP_ZEROES ((unsigned int) hi32.X_add_number);
if (shift != 0)
{
expressionS tmp;
/* This instruction will set the register to be all
ones. */
tmp.X_op = O_constant;
tmp.X_add_number = (offsetT) -1;
macro_build (&tmp, "addiu", "t,r,j", reg, 0, BFD_RELOC_LO16);
if (bit != 0)
{
bit += shift;
macro_build (NULL, (bit >= 32) ? "dsll32" : "dsll", "d,w,<",
reg, reg, (bit >= 32) ? bit - 32 : bit);
}
macro_build (NULL, (shift >= 32) ? "dsrl32" : "dsrl", "d,w,<",
reg, reg, (shift >= 32) ? shift - 32 : shift);
return;
}
}
/* Sign extend hi32 before calling load_register, because we can
generally get better code when we load a sign extended value. */
if ((hi32.X_add_number & 0x80000000) != 0)
hi32.X_add_number |= ~(offsetT) 0xffffffff;
load_register (reg, &hi32, 0);
freg = reg;
}
if ((lo32.X_add_number & 0xffff0000) == 0)
{
if (freg != 0)
{
macro_build (NULL, "dsll32", "d,w,<", reg, freg, 0);
freg = reg;
}
}
else
{
expressionS mid16;
if ((freg == 0) && (lo32.X_add_number == (offsetT) 0xffffffff))
{
macro_build (&lo32, "lui", "t,u", reg, BFD_RELOC_HI16);
macro_build (NULL, "dsrl32", "d,w,<", reg, reg, 0);
return;
}
if (freg != 0)
{
macro_build (NULL, "dsll", "d,w,<", reg, freg, 16);
freg = reg;
}
mid16 = lo32;
mid16.X_add_number >>= 16;
macro_build (&mid16, "ori", "t,r,i", reg, freg, BFD_RELOC_LO16);
macro_build (NULL, "dsll", "d,w,<", reg, reg, 16);
freg = reg;
}
if ((lo32.X_add_number & 0xffff) != 0)
macro_build (&lo32, "ori", "t,r,i", reg, freg, BFD_RELOC_LO16);
}
static inline void
load_delay_nop (void)
{
if (!gpr_interlocks)
macro_build (NULL, "nop", "");
}
/* Load an address into a register. */
static void
load_address (int reg, expressionS *ep, int *used_at)
{
if (ep->X_op != O_constant
&& ep->X_op != O_symbol)
{
as_bad (_("expression too complex"));
ep->X_op = O_constant;
}
if (ep->X_op == O_constant)
{
load_register (reg, ep, HAVE_64BIT_ADDRESSES);
return;
}
if (mips_pic == NO_PIC)
{
/* If this is a reference to a GP relative symbol, we want
addiu $reg,$gp,<sym> (BFD_RELOC_GPREL16)
Otherwise we want
lui $reg,<sym> (BFD_RELOC_HI16_S)
addiu $reg,$reg,<sym> (BFD_RELOC_LO16)
If we have an addend, we always use the latter form.
With 64bit address space and a usable $at we want
lui $reg,<sym> (BFD_RELOC_MIPS_HIGHEST)
lui $at,<sym> (BFD_RELOC_HI16_S)
daddiu $reg,<sym> (BFD_RELOC_MIPS_HIGHER)
daddiu $at,<sym> (BFD_RELOC_LO16)
dsll32 $reg,0
daddu $reg,$reg,$at
If $at is already in use, we use a path which is suboptimal
on superscalar processors.
lui $reg,<sym> (BFD_RELOC_MIPS_HIGHEST)
daddiu $reg,<sym> (BFD_RELOC_MIPS_HIGHER)
dsll $reg,16
daddiu $reg,<sym> (BFD_RELOC_HI16_S)
dsll $reg,16
daddiu $reg,<sym> (BFD_RELOC_LO16)
*/
if (HAVE_64BIT_ADDRESSES)
{
/* ??? We don't provide a GP-relative alternative for these macros.
It used not to be possible with the original relaxation code,
but it could be done now. */
if (*used_at == 0 && ! mips_opts.noat)
{
macro_build (ep, "lui", "t,u", reg, BFD_RELOC_MIPS_HIGHEST);
macro_build (ep, "lui", "t,u", AT, BFD_RELOC_HI16_S);
macro_build (ep, "daddiu", "t,r,j", reg, reg,
BFD_RELOC_MIPS_HIGHER);
macro_build (ep, "daddiu", "t,r,j", AT, AT, BFD_RELOC_LO16);
macro_build (NULL, "dsll32", "d,w,<", reg, reg, 0);
macro_build (NULL, "daddu", "d,v,t", reg, reg, AT);
*used_at = 1;
}
else
{
macro_build (ep, "lui", "t,u", reg, BFD_RELOC_MIPS_HIGHEST);
macro_build (ep, "daddiu", "t,r,j", reg, reg,
BFD_RELOC_MIPS_HIGHER);
macro_build (NULL, "dsll", "d,w,<", reg, reg, 16);
macro_build (ep, "daddiu", "t,r,j", reg, reg, BFD_RELOC_HI16_S);
macro_build (NULL, "dsll", "d,w,<", reg, reg, 16);
macro_build (ep, "daddiu", "t,r,j", reg, reg, BFD_RELOC_LO16);
}
}
else
{
if ((valueT) ep->X_add_number <= MAX_GPREL_OFFSET
&& ! nopic_need_relax (ep->X_add_symbol, 1))
{
relax_start (ep->X_add_symbol);
macro_build (ep, ADDRESS_ADDI_INSN, "t,r,j", reg,
mips_gp_register, BFD_RELOC_GPREL16);
relax_switch ();
}
macro_build_lui (ep, reg);
macro_build (ep, ADDRESS_ADDI_INSN, "t,r,j",
reg, reg, BFD_RELOC_LO16);
if (mips_relax.sequence)
relax_end ();
}
}
else if (mips_pic == SVR4_PIC && ! mips_big_got)
{
expressionS ex;
/* If this is a reference to an external symbol, we want
lw $reg,<sym>($gp) (BFD_RELOC_MIPS_GOT16)
Otherwise we want
lw $reg,<sym>($gp) (BFD_RELOC_MIPS_GOT16)
nop
addiu $reg,$reg,<sym> (BFD_RELOC_LO16)
If there is a constant, it must be added in after.
If we have NewABI, we want
lw $reg,<sym+cst>($gp) (BFD_RELOC_MIPS_GOT_DISP)
unless we're referencing a global symbol with a non-zero
offset, in which case cst must be added separately. */
if (HAVE_NEWABI)
{
if (ep->X_add_number)
{
ex.X_add_number = ep->X_add_number;
ep->X_add_number = 0;
relax_start (ep->X_add_symbol);
macro_build (ep, ADDRESS_LOAD_INSN, "t,o(b)", reg,
BFD_RELOC_MIPS_GOT_DISP, mips_gp_register);
if (ex.X_add_number < -0x8000 || ex.X_add_number >= 0x8000)
as_bad (_("PIC code offset overflow (max 16 signed bits)"));
ex.X_op = O_constant;
macro_build (&ex, ADDRESS_ADDI_INSN, "t,r,j",
reg, reg, BFD_RELOC_LO16);
ep->X_add_number = ex.X_add_number;
relax_switch ();
}
macro_build (ep, ADDRESS_LOAD_INSN, "t,o(b)", reg,
BFD_RELOC_MIPS_GOT_DISP, mips_gp_register);
if (mips_relax.sequence)
relax_end ();
}
else
{
ex.X_add_number = ep->X_add_number;
ep->X_add_number = 0;
macro_build (ep, ADDRESS_LOAD_INSN, "t,o(b)", reg,
BFD_RELOC_MIPS_GOT16, mips_gp_register);
load_delay_nop ();
relax_start (ep->X_add_symbol);
relax_switch ();
macro_build (ep, ADDRESS_ADDI_INSN, "t,r,j", reg, reg,
BFD_RELOC_LO16);
relax_end ();
if (ex.X_add_number != 0)
{
if (ex.X_add_number < -0x8000 || ex.X_add_number >= 0x8000)
as_bad (_("PIC code offset overflow (max 16 signed bits)"));
ex.X_op = O_constant;
macro_build (&ex, ADDRESS_ADDI_INSN, "t,r,j",
reg, reg, BFD_RELOC_LO16);
}
}
}
else if (mips_pic == SVR4_PIC)
{
expressionS ex;
/* This is the large GOT case. If this is a reference to an
external symbol, we want
lui $reg,<sym> (BFD_RELOC_MIPS_GOT_HI16)
addu $reg,$reg,$gp
lw $reg,<sym>($reg) (BFD_RELOC_MIPS_GOT_LO16)
Otherwise, for a reference to a local symbol in old ABI, we want
lw $reg,<sym>($gp) (BFD_RELOC_MIPS_GOT16)
nop
addiu $reg,$reg,<sym> (BFD_RELOC_LO16)
If there is a constant, it must be added in after.
In the NewABI, for local symbols, with or without offsets, we want:
lw $reg,<sym>($gp) (BFD_RELOC_MIPS_GOT_PAGE)
addiu $reg,$reg,<sym> (BFD_RELOC_MIPS_GOT_OFST)
*/
if (HAVE_NEWABI)
{
ex.X_add_number = ep->X_add_number;
ep->X_add_number = 0;
relax_start (ep->X_add_symbol);
macro_build (ep, "lui", "t,u", reg, BFD_RELOC_MIPS_GOT_HI16);
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t",
reg, reg, mips_gp_register);
macro_build (ep, ADDRESS_LOAD_INSN, "t,o(b)",
reg, BFD_RELOC_MIPS_GOT_LO16, reg);
if (ex.X_add_number < -0x8000 || ex.X_add_number >= 0x8000)
as_bad (_("PIC code offset overflow (max 16 signed bits)"));
else if (ex.X_add_number)
{
ex.X_op = O_constant;
macro_build (&ex, ADDRESS_ADDI_INSN, "t,r,j", reg, reg,
BFD_RELOC_LO16);
}
ep->X_add_number = ex.X_add_number;
relax_switch ();
macro_build (ep, ADDRESS_LOAD_INSN, "t,o(b)", reg,
BFD_RELOC_MIPS_GOT_PAGE, mips_gp_register);
macro_build (ep, ADDRESS_ADDI_INSN, "t,r,j", reg, reg,
BFD_RELOC_MIPS_GOT_OFST);
relax_end ();
}
else
{
ex.X_add_number = ep->X_add_number;
ep->X_add_number = 0;
relax_start (ep->X_add_symbol);
macro_build (ep, "lui", "t,u", reg, BFD_RELOC_MIPS_GOT_HI16);
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t",
reg, reg, mips_gp_register);
macro_build (ep, ADDRESS_LOAD_INSN, "t,o(b)",
reg, BFD_RELOC_MIPS_GOT_LO16, reg);
relax_switch ();
if (reg_needs_delay (mips_gp_register))
{
/* We need a nop before loading from $gp. This special
check is required because the lui which starts the main
instruction stream does not refer to $gp, and so will not
insert the nop which may be required. */
macro_build (NULL, "nop", "");
}
macro_build (ep, ADDRESS_LOAD_INSN, "t,o(b)", reg,
BFD_RELOC_MIPS_GOT16, mips_gp_register);
load_delay_nop ();
macro_build (ep, ADDRESS_ADDI_INSN, "t,r,j", reg, reg,
BFD_RELOC_LO16);
relax_end ();
if (ex.X_add_number != 0)
{
if (ex.X_add_number < -0x8000 || ex.X_add_number >= 0x8000)
as_bad (_("PIC code offset overflow (max 16 signed bits)"));
ex.X_op = O_constant;
macro_build (&ex, ADDRESS_ADDI_INSN, "t,r,j", reg, reg,
BFD_RELOC_LO16);
}
}
}
else
abort ();
}
/* Move the contents of register SOURCE into register DEST. */
static void
move_register (int dest, int source)
{
macro_build (NULL, HAVE_32BIT_GPRS ? "addu" : "daddu", "d,v,t",
dest, source, 0);
}
/* Emit an SVR4 PIC sequence to load address LOCAL into DEST, where
LOCAL is the sum of a symbol and a 16-bit or 32-bit displacement.
The two alternatives are:
Global symbol Local sybmol
------------- ------------
lw DEST,%got(SYMBOL) lw DEST,%got(SYMBOL + OFFSET)
... ...
addiu DEST,DEST,OFFSET addiu DEST,DEST,%lo(SYMBOL + OFFSET)
load_got_offset emits the first instruction and add_got_offset
emits the second for a 16-bit offset or add_got_offset_hilo emits
a sequence to add a 32-bit offset using a scratch register. */
static void
load_got_offset (int dest, expressionS *local)
{
expressionS global;
global = *local;
global.X_add_number = 0;
relax_start (local->X_add_symbol);
macro_build (&global, ADDRESS_LOAD_INSN, "t,o(b)", dest,
BFD_RELOC_MIPS_GOT16, mips_gp_register);
relax_switch ();
macro_build (local, ADDRESS_LOAD_INSN, "t,o(b)", dest,
BFD_RELOC_MIPS_GOT16, mips_gp_register);
relax_end ();
}
static void
add_got_offset (int dest, expressionS *local)
{
expressionS global;
global.X_op = O_constant;
global.X_op_symbol = NULL;
global.X_add_symbol = NULL;
global.X_add_number = local->X_add_number;
relax_start (local->X_add_symbol);
macro_build (&global, ADDRESS_ADDI_INSN, "t,r,j",
dest, dest, BFD_RELOC_LO16);
relax_switch ();
macro_build (local, ADDRESS_ADDI_INSN, "t,r,j", dest, dest, BFD_RELOC_LO16);
relax_end ();
}
static void
add_got_offset_hilo (int dest, expressionS *local, int tmp)
{
expressionS global;
int hold_mips_optimize;
global.X_op = O_constant;
global.X_op_symbol = NULL;
global.X_add_symbol = NULL;
global.X_add_number = local->X_add_number;
relax_start (local->X_add_symbol);
load_register (tmp, &global, HAVE_64BIT_ADDRESSES);
relax_switch ();
/* Set mips_optimize around the lui instruction to avoid
inserting an unnecessary nop after the lw. */
hold_mips_optimize = mips_optimize;
mips_optimize = 2;
macro_build_lui (&global, tmp);
mips_optimize = hold_mips_optimize;
macro_build (local, ADDRESS_ADDI_INSN, "t,r,j", tmp, tmp, BFD_RELOC_LO16);
relax_end ();
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", dest, dest, tmp);
}
/*
* Build macros
* This routine implements the seemingly endless macro or synthesized
* instructions and addressing modes in the mips assembly language. Many
* of these macros are simple and are similar to each other. These could
* probably be handled by some kind of table or grammar approach instead of
* this verbose method. Others are not simple macros but are more like
* optimizing code generation.
* One interesting optimization is when several store macros appear
* consecutively that would load AT with the upper half of the same address.
* The ensuing load upper instructions are ommited. This implies some kind
* of global optimization. We currently only optimize within a single macro.
* For many of the load and store macros if the address is specified as a
* constant expression in the first 64k of memory (ie ld $2,0x4000c) we
* first load register 'at' with zero and use it as the base register. The
* mips assembler simply uses register $zero. Just one tiny optimization
* we're missing.
*/
static void
macro (struct mips_cl_insn *ip)
{
register int treg, sreg, dreg, breg;
int tempreg;
int mask;
int used_at = 0;
expressionS expr1;
const char *s;
const char *s2;
const char *fmt;
int likely = 0;
int dbl = 0;
int coproc = 0;
int lr = 0;
int imm = 0;
int call = 0;
int off;
offsetT maxnum;
bfd_reloc_code_real_type r;
int hold_mips_optimize;
assert (! mips_opts.mips16);
treg = (ip->insn_opcode >> 16) & 0x1f;
dreg = (ip->insn_opcode >> 11) & 0x1f;
sreg = breg = (ip->insn_opcode >> 21) & 0x1f;
mask = ip->insn_mo->mask;
expr1.X_op = O_constant;
expr1.X_op_symbol = NULL;
expr1.X_add_symbol = NULL;
expr1.X_add_number = 1;
switch (mask)
{
case M_DABS:
dbl = 1;
case M_ABS:
/* bgez $a0,.+12
move v0,$a0
sub v0,$zero,$a0
*/
mips_emit_delays (TRUE);
++mips_opts.noreorder;
mips_any_noreorder = 1;
expr1.X_add_number = 8;
macro_build (&expr1, "bgez", "s,p", sreg);
if (dreg == sreg)
macro_build (NULL, "nop", "", 0);
else
move_register (dreg, sreg);
macro_build (NULL, dbl ? "dsub" : "sub", "d,v,t", dreg, 0, sreg);
--mips_opts.noreorder;
return;
case M_ADD_I:
s = "addi";
s2 = "add";
goto do_addi;
case M_ADDU_I:
s = "addiu";
s2 = "addu";
goto do_addi;
case M_DADD_I:
dbl = 1;
s = "daddi";
s2 = "dadd";
goto do_addi;
case M_DADDU_I:
dbl = 1;
s = "daddiu";
s2 = "daddu";
do_addi:
if (imm_expr.X_op == O_constant
&& imm_expr.X_add_number >= -0x8000
&& imm_expr.X_add_number < 0x8000)
{
macro_build (&imm_expr, s, "t,r,j", treg, sreg, BFD_RELOC_LO16);
return;
}
load_register (AT, &imm_expr, dbl);
macro_build (NULL, s2, "d,v,t", treg, sreg, AT);
break;
case M_AND_I:
s = "andi";
s2 = "and";
goto do_bit;
case M_OR_I:
s = "ori";
s2 = "or";
goto do_bit;
case M_NOR_I:
s = "";
s2 = "nor";
goto do_bit;
case M_XOR_I:
s = "xori";
s2 = "xor";
do_bit:
if (imm_expr.X_op == O_constant
&& imm_expr.X_add_number >= 0
&& imm_expr.X_add_number < 0x10000)
{
if (mask != M_NOR_I)
macro_build (&imm_expr, s, "t,r,i", treg, sreg, BFD_RELOC_LO16);
else
{
macro_build (&imm_expr, "ori", "t,r,i",
treg, sreg, BFD_RELOC_LO16);
macro_build (NULL, "nor", "d,v,t", treg, treg, 0);
}
return;
}
load_register (AT, &imm_expr, HAVE_64BIT_GPRS);
macro_build (NULL, s2, "d,v,t", treg, sreg, AT);
break;
case M_BEQ_I:
s = "beq";
goto beq_i;
case M_BEQL_I:
s = "beql";
likely = 1;
goto beq_i;
case M_BNE_I:
s = "bne";
goto beq_i;
case M_BNEL_I:
s = "bnel";
likely = 1;
beq_i:
if (imm_expr.X_op == O_constant && imm_expr.X_add_number == 0)
{
macro_build (&offset_expr, s, "s,t,p", sreg, 0);
return;
}
load_register (AT, &imm_expr, HAVE_64BIT_GPRS);
macro_build (&offset_expr, s, "s,t,p", sreg, AT);
break;
case M_BGEL:
likely = 1;
case M_BGE:
if (treg == 0)
{
macro_build (&offset_expr, likely ? "bgezl" : "bgez", "s,p", sreg);
return;
}
if (sreg == 0)
{
macro_build (&offset_expr, likely ? "blezl" : "blez", "s,p", treg);
return;
}
macro_build (NULL, "slt", "d,v,t", AT, sreg, treg);
macro_build (&offset_expr, likely ? "beql" : "beq", "s,t,p", AT, 0);
break;
case M_BGTL_I:
likely = 1;
case M_BGT_I:
/* check for > max integer */
maxnum = 0x7fffffff;
if (HAVE_64BIT_GPRS && sizeof (maxnum) > 4)
{
maxnum <<= 16;
maxnum |= 0xffff;
maxnum <<= 16;
maxnum |= 0xffff;
}
if (imm_expr.X_op == O_constant
&& imm_expr.X_add_number >= maxnum
&& (HAVE_32BIT_GPRS || sizeof (maxnum) > 4))
{
do_false:
/* result is always false */
if (! likely)
macro_build (NULL, "nop", "", 0);
else
macro_build (&offset_expr, "bnel", "s,t,p", 0, 0);
return;
}
if (imm_expr.X_op != O_constant)
as_bad (_("Unsupported large constant"));
++imm_expr.X_add_number;
/* FALLTHROUGH */
case M_BGE_I:
case M_BGEL_I:
if (mask == M_BGEL_I)
likely = 1;
if (imm_expr.X_op == O_constant && imm_expr.X_add_number == 0)
{
macro_build (&offset_expr, likely ? "bgezl" : "bgez", "s,p", sreg);
return;
}
if (imm_expr.X_op == O_constant && imm_expr.X_add_number == 1)
{
macro_build (&offset_expr, likely ? "bgtzl" : "bgtz", "s,p", sreg);
return;
}
maxnum = 0x7fffffff;
if (HAVE_64BIT_GPRS && sizeof (maxnum) > 4)
{
maxnum <<= 16;
maxnum |= 0xffff;
maxnum <<= 16;
maxnum |= 0xffff;
}
maxnum = - maxnum - 1;
if (imm_expr.X_op == O_constant
&& imm_expr.X_add_number <= maxnum
&& (HAVE_32BIT_GPRS || sizeof (maxnum) > 4))
{
do_true:
/* result is always true */
as_warn (_("Branch %s is always true"), ip->insn_mo->name);
macro_build (&offset_expr, "b", "p");
return;
}
set_at (sreg, 0);
macro_build (&offset_expr, likely ? "beql" : "beq", "s,t,p", AT, 0);
break;
case M_BGEUL:
likely = 1;
case M_BGEU:
if (treg == 0)
goto do_true;
if (sreg == 0)
{
macro_build (&offset_expr, likely ? "beql" : "beq",
"s,t,p", 0, treg);
return;
}
macro_build (NULL, "sltu", "d,v,t", AT, sreg, treg);
macro_build (&offset_expr, likely ? "beql" : "beq", "s,t,p", AT, 0);
break;
case M_BGTUL_I:
likely = 1;
case M_BGTU_I:
if (sreg == 0
|| (HAVE_32BIT_GPRS
&& imm_expr.X_op == O_constant
&& imm_expr.X_add_number == (offsetT) 0xffffffff))
goto do_false;
if (imm_expr.X_op != O_constant)
as_bad (_("Unsupported large constant"));
++imm_expr.X_add_number;
/* FALLTHROUGH */
case M_BGEU_I:
case M_BGEUL_I:
if (mask == M_BGEUL_I)
likely = 1;
if (imm_expr.X_op == O_constant && imm_expr.X_add_number == 0)
goto do_true;
if (imm_expr.X_op == O_constant && imm_expr.X_add_number == 1)
{
macro_build (&offset_expr, likely ? "bnel" : "bne",
"s,t,p", sreg, 0);
return;
}
set_at (sreg, 1);
macro_build (&offset_expr, likely ? "beql" : "beq", "s,t,p", AT, 0);
break;
case M_BGTL:
likely = 1;
case M_BGT:
if (treg == 0)
{
macro_build (&offset_expr, likely ? "bgtzl" : "bgtz", "s,p", sreg);
return;
}
if (sreg == 0)
{
macro_build (&offset_expr, likely ? "bltzl" : "bltz", "s,p", treg);
return;
}
macro_build (NULL, "slt", "d,v,t", AT, treg, sreg);
macro_build (&offset_expr, likely ? "bnel" : "bne", "s,t,p", AT, 0);
break;
case M_BGTUL:
likely = 1;
case M_BGTU:
if (treg == 0)
{
macro_build (&offset_expr, likely ? "bnel" : "bne",
"s,t,p", sreg, 0);
return;
}
if (sreg == 0)
goto do_false;
macro_build (NULL, "sltu", "d,v,t", AT, treg, sreg);
macro_build (&offset_expr, likely ? "bnel" : "bne", "s,t,p", AT, 0);
break;
case M_BLEL:
likely = 1;
case M_BLE:
if (treg == 0)
{
macro_build (&offset_expr, likely ? "blezl" : "blez", "s,p", sreg);
return;
}
if (sreg == 0)
{
macro_build (&offset_expr, likely ? "bgezl" : "bgez", "s,p", treg);
return;
}
macro_build (NULL, "slt", "d,v,t", AT, treg, sreg);
macro_build (&offset_expr, likely ? "beql" : "beq", "s,t,p", AT, 0);
break;
case M_BLEL_I:
likely = 1;
case M_BLE_I:
maxnum = 0x7fffffff;
if (HAVE_64BIT_GPRS && sizeof (maxnum) > 4)
{
maxnum <<= 16;
maxnum |= 0xffff;
maxnum <<= 16;
maxnum |= 0xffff;
}
if (imm_expr.X_op == O_constant
&& imm_expr.X_add_number >= maxnum
&& (HAVE_32BIT_GPRS || sizeof (maxnum) > 4))
goto do_true;
if (imm_expr.X_op != O_constant)
as_bad (_("Unsupported large constant"));
++imm_expr.X_add_number;
/* FALLTHROUGH */
case M_BLT_I:
case M_BLTL_I:
if (mask == M_BLTL_I)
likely = 1;
if (imm_expr.X_op == O_constant && imm_expr.X_add_number == 0)
{
macro_build (&offset_expr, likely ? "bltzl" : "bltz", "s,p", sreg);
return;
}
if (imm_expr.X_op == O_constant && imm_expr.X_add_number == 1)
{
macro_build (&offset_expr, likely ? "blezl" : "blez", "s,p", sreg);
return;
}
set_at (sreg, 0);
macro_build (&offset_expr, likely ? "bnel" : "bne", "s,t,p", AT, 0);
break;
case M_BLEUL:
likely = 1;
case M_BLEU:
if (treg == 0)
{
macro_build (&offset_expr, likely ? "beql" : "beq",
"s,t,p", sreg, 0);
return;
}
if (sreg == 0)
goto do_true;
macro_build (NULL, "sltu", "d,v,t", AT, treg, sreg);
macro_build (&offset_expr, likely ? "beql" : "beq", "s,t,p", AT, 0);
break;
case M_BLEUL_I:
likely = 1;
case M_BLEU_I:
if (sreg == 0
|| (HAVE_32BIT_GPRS
&& imm_expr.X_op == O_constant
&& imm_expr.X_add_number == (offsetT) 0xffffffff))
goto do_true;
if (imm_expr.X_op != O_constant)
as_bad (_("Unsupported large constant"));
++imm_expr.X_add_number;
/* FALLTHROUGH */
case M_BLTU_I:
case M_BLTUL_I:
if (mask == M_BLTUL_I)
likely = 1;
if (imm_expr.X_op == O_constant && imm_expr.X_add_number == 0)
goto do_false;
if (imm_expr.X_op == O_constant && imm_expr.X_add_number == 1)
{
macro_build (&offset_expr, likely ? "beql" : "beq",
"s,t,p", sreg, 0);
return;
}
set_at (sreg, 1);
macro_build (&offset_expr, likely ? "bnel" : "bne", "s,t,p", AT, 0);
break;
case M_BLTL:
likely = 1;
case M_BLT:
if (treg == 0)
{
macro_build (&offset_expr, likely ? "bltzl" : "bltz", "s,p", sreg);
return;
}
if (sreg == 0)
{
macro_build (&offset_expr, likely ? "bgtzl" : "bgtz", "s,p", treg);
return;
}
macro_build (NULL, "slt", "d,v,t", AT, sreg, treg);
macro_build (&offset_expr, likely ? "bnel" : "bne", "s,t,p", AT, 0);
break;
case M_BLTUL:
likely = 1;
case M_BLTU:
if (treg == 0)
goto do_false;
if (sreg == 0)
{
macro_build (&offset_expr, likely ? "bnel" : "bne",
"s,t,p", 0, treg);
return;
}
macro_build (NULL, "sltu", "d,v,t", AT, sreg, treg);
macro_build (&offset_expr, likely ? "bnel" : "bne", "s,t,p", AT, 0);
break;
case M_DEXT:
{
unsigned long pos;
unsigned long size;
if (imm_expr.X_op != O_constant || imm2_expr.X_op != O_constant)
{
as_bad (_("Unsupported large constant"));
pos = size = 1;
}
else
{
pos = (unsigned long) imm_expr.X_add_number;
size = (unsigned long) imm2_expr.X_add_number;
}
if (pos > 63)
{
as_bad (_("Improper position (%lu)"), pos);
pos = 1;
}
if (size == 0 || size > 64
|| (pos + size - 1) > 63)
{
as_bad (_("Improper extract size (%lu, position %lu)"),
size, pos);
size = 1;
}
if (size <= 32 && pos < 32)
{
s = "dext";
fmt = "t,r,+A,+C";
}
else if (size <= 32)
{
s = "dextu";
fmt = "t,r,+E,+H";
}
else
{
s = "dextm";
fmt = "t,r,+A,+G";
}
macro_build ((expressionS *) NULL, s, fmt, treg, sreg, pos, size - 1);
}
return;
case M_DINS:
{
unsigned long pos;
unsigned long size;
if (imm_expr.X_op != O_constant || imm2_expr.X_op != O_constant)
{
as_bad (_("Unsupported large constant"));
pos = size = 1;
}
else
{
pos = (unsigned long) imm_expr.X_add_number;
size = (unsigned long) imm2_expr.X_add_number;
}
if (pos > 63)
{
as_bad (_("Improper position (%lu)"), pos);
pos = 1;
}
if (size == 0 || size > 64
|| (pos + size - 1) > 63)
{
as_bad (_("Improper insert size (%lu, position %lu)"),
size, pos);
size = 1;
}
if (pos < 32 && (pos + size - 1) < 32)
{
s = "dins";
fmt = "t,r,+A,+B";
}
else if (pos >= 32)
{
s = "dinsu";
fmt = "t,r,+E,+F";
}
else
{
s = "dinsm";
fmt = "t,r,+A,+F";
}
macro_build ((expressionS *) NULL, s, fmt, treg, sreg, pos,
pos + size - 1);
}
return;
case M_DDIV_3:
dbl = 1;
case M_DIV_3:
s = "mflo";
goto do_div3;
case M_DREM_3:
dbl = 1;
case M_REM_3:
s = "mfhi";
do_div3:
if (treg == 0)
{
as_warn (_("Divide by zero."));
if (mips_trap)
macro_build (NULL, "teq", "s,t,q", 0, 0, 7);
else
macro_build (NULL, "break", "c", 7);
return;
}
mips_emit_delays (TRUE);
++mips_opts.noreorder;
mips_any_noreorder = 1;
if (mips_trap)
{
macro_build (NULL, "teq", "s,t,q", treg, 0, 7);
macro_build (NULL, dbl ? "ddiv" : "div", "z,s,t", sreg, treg);
}
else
{
expr1.X_add_number = 8;
macro_build (&expr1, "bne", "s,t,p", treg, 0);
macro_build (NULL, dbl ? "ddiv" : "div", "z,s,t", sreg, treg);
macro_build (NULL, "break", "c", 7);
}
expr1.X_add_number = -1;
load_register (AT, &expr1, dbl);
expr1.X_add_number = mips_trap ? (dbl ? 12 : 8) : (dbl ? 20 : 16);
macro_build (&expr1, "bne", "s,t,p", treg, AT);
if (dbl)
{
expr1.X_add_number = 1;
load_register (AT, &expr1, dbl);
macro_build (NULL, "dsll32", "d,w,<", AT, AT, 31);
}
else
{
expr1.X_add_number = 0x80000000;
macro_build (&expr1, "lui", "t,u", AT, BFD_RELOC_HI16);
}
if (mips_trap)
{
macro_build (NULL, "teq", "s,t,q", sreg, AT, 6);
/* We want to close the noreorder block as soon as possible, so
that later insns are available for delay slot filling. */
--mips_opts.noreorder;
}
else
{
expr1.X_add_number = 8;
macro_build (&expr1, "bne", "s,t,p", sreg, AT);
macro_build (NULL, "nop", "", 0);
/* We want to close the noreorder block as soon as possible, so
that later insns are available for delay slot filling. */
--mips_opts.noreorder;
macro_build (NULL, "break", "c", 6);
}
macro_build (NULL, s, "d", dreg);
break;
case M_DIV_3I:
s = "div";
s2 = "mflo";
goto do_divi;
case M_DIVU_3I:
s = "divu";
s2 = "mflo";
goto do_divi;
case M_REM_3I:
s = "div";
s2 = "mfhi";
goto do_divi;
case M_REMU_3I:
s = "divu";
s2 = "mfhi";
goto do_divi;
case M_DDIV_3I:
dbl = 1;
s = "ddiv";
s2 = "mflo";
goto do_divi;
case M_DDIVU_3I:
dbl = 1;
s = "ddivu";
s2 = "mflo";
goto do_divi;
case M_DREM_3I:
dbl = 1;
s = "ddiv";
s2 = "mfhi";
goto do_divi;
case M_DREMU_3I:
dbl = 1;
s = "ddivu";
s2 = "mfhi";
do_divi:
if (imm_expr.X_op == O_constant && imm_expr.X_add_number == 0)
{
as_warn (_("Divide by zero."));
if (mips_trap)
macro_build (NULL, "teq", "s,t,q", 0, 0, 7);
else
macro_build (NULL, "break", "c", 7);
return;
}
if (imm_expr.X_op == O_constant && imm_expr.X_add_number == 1)
{
if (strcmp (s2, "mflo") == 0)
move_register (dreg, sreg);
else
move_register (dreg, 0);
return;
}
if (imm_expr.X_op == O_constant
&& imm_expr.X_add_number == -1
&& s[strlen (s) - 1] != 'u')
{
if (strcmp (s2, "mflo") == 0)
{
macro_build (NULL, dbl ? "dneg" : "neg", "d,w", dreg, sreg);
}
else
move_register (dreg, 0);
return;
}
load_register (AT, &imm_expr, dbl);
macro_build (NULL, s, "z,s,t", sreg, AT);
macro_build (NULL, s2, "d", dreg);
break;
case M_DIVU_3:
s = "divu";
s2 = "mflo";
goto do_divu3;
case M_REMU_3:
s = "divu";
s2 = "mfhi";
goto do_divu3;
case M_DDIVU_3:
s = "ddivu";
s2 = "mflo";
goto do_divu3;
case M_DREMU_3:
s = "ddivu";
s2 = "mfhi";
do_divu3:
mips_emit_delays (TRUE);
++mips_opts.noreorder;
mips_any_noreorder = 1;
if (mips_trap)
{
macro_build (NULL, "teq", "s,t,q", treg, 0, 7);
macro_build (NULL, s, "z,s,t", sreg, treg);
/* We want to close the noreorder block as soon as possible, so
that later insns are available for delay slot filling. */
--mips_opts.noreorder;
}
else
{
expr1.X_add_number = 8;
macro_build (&expr1, "bne", "s,t,p", treg, 0);
macro_build (NULL, s, "z,s,t", sreg, treg);
/* We want to close the noreorder block as soon as possible, so
that later insns are available for delay slot filling. */
--mips_opts.noreorder;
macro_build (NULL, "break", "c", 7);
}
macro_build (NULL, s2, "d", dreg);
return;
case M_DLCA_AB:
dbl = 1;
case M_LCA_AB:
call = 1;
goto do_la;
case M_DLA_AB:
dbl = 1;
case M_LA_AB:
do_la:
/* Load the address of a symbol into a register. If breg is not
zero, we then add a base register to it. */
if (dbl && HAVE_32BIT_GPRS)
as_warn (_("dla used to load 32-bit register"));
if (! dbl && HAVE_64BIT_OBJECTS)
as_warn (_("la used to load 64-bit address"));
if (offset_expr.X_op == O_constant
&& offset_expr.X_add_number >= -0x8000
&& offset_expr.X_add_number < 0x8000)
{
macro_build (&offset_expr,
(dbl || HAVE_64BIT_ADDRESSES) ? "daddiu" : "addiu",
"t,r,j", treg, sreg, BFD_RELOC_LO16);
return;
}
if (treg == breg)
{
tempreg = AT;
used_at = 1;
}
else
{
tempreg = treg;
used_at = 0;
}
if (offset_expr.X_op != O_symbol
&& offset_expr.X_op != O_constant)
{
as_bad (_("expression too complex"));
offset_expr.X_op = O_constant;
}
if (offset_expr.X_op == O_constant)
load_register (tempreg, &offset_expr,
(mips_pic == NO_PIC
? (dbl || HAVE_64BIT_ADDRESSES)
: HAVE_64BIT_ADDRESSES));
else if (mips_pic == NO_PIC)
{
/* If this is a reference to a GP relative symbol, we want
addiu $tempreg,$gp,<sym> (BFD_RELOC_GPREL16)
Otherwise we want
lui $tempreg,<sym> (BFD_RELOC_HI16_S)
addiu $tempreg,$tempreg,<sym> (BFD_RELOC_LO16)
If we have a constant, we need two instructions anyhow,
so we may as well always use the latter form.
With 64bit address space and a usable $at we want
lui $tempreg,<sym> (BFD_RELOC_MIPS_HIGHEST)
lui $at,<sym> (BFD_RELOC_HI16_S)
daddiu $tempreg,<sym> (BFD_RELOC_MIPS_HIGHER)
daddiu $at,<sym> (BFD_RELOC_LO16)
dsll32 $tempreg,0
daddu $tempreg,$tempreg,$at
If $at is already in use, we use a path which is suboptimal
on superscalar processors.
lui $tempreg,<sym> (BFD_RELOC_MIPS_HIGHEST)
daddiu $tempreg,<sym> (BFD_RELOC_MIPS_HIGHER)
dsll $tempreg,16
daddiu $tempreg,<sym> (BFD_RELOC_HI16_S)
dsll $tempreg,16
daddiu $tempreg,<sym> (BFD_RELOC_LO16)
*/
if (HAVE_64BIT_ADDRESSES)
{
/* ??? We don't provide a GP-relative alternative for
these macros. It used not to be possible with the
original relaxation code, but it could be done now. */
if (used_at == 0 && ! mips_opts.noat)
{
macro_build (&offset_expr, "lui", "t,u",
tempreg, BFD_RELOC_MIPS_HIGHEST);
macro_build (&offset_expr, "lui", "t,u",
AT, BFD_RELOC_HI16_S);
macro_build (&offset_expr, "daddiu", "t,r,j",
tempreg, tempreg, BFD_RELOC_MIPS_HIGHER);
macro_build (&offset_expr, "daddiu", "t,r,j",
AT, AT, BFD_RELOC_LO16);
macro_build (NULL, "dsll32", "d,w,<", tempreg, tempreg, 0);
macro_build (NULL, "daddu", "d,v,t", tempreg, tempreg, AT);
used_at = 1;
}
else
{
macro_build (&offset_expr, "lui", "t,u",
tempreg, BFD_RELOC_MIPS_HIGHEST);
macro_build (&offset_expr, "daddiu", "t,r,j",
tempreg, tempreg, BFD_RELOC_MIPS_HIGHER);
macro_build (NULL, "dsll", "d,w,<", tempreg, tempreg, 16);
macro_build (&offset_expr, "daddiu", "t,r,j",
tempreg, tempreg, BFD_RELOC_HI16_S);
macro_build (NULL, "dsll", "d,w,<", tempreg, tempreg, 16);
macro_build (&offset_expr, "daddiu", "t,r,j",
tempreg, tempreg, BFD_RELOC_LO16);
}
}
else
{
if ((valueT) offset_expr.X_add_number <= MAX_GPREL_OFFSET
&& ! nopic_need_relax (offset_expr.X_add_symbol, 1))
{
relax_start (offset_expr.X_add_symbol);
macro_build (&offset_expr, ADDRESS_ADDI_INSN, "t,r,j",
tempreg, mips_gp_register, BFD_RELOC_GPREL16);
relax_switch ();
}
macro_build_lui (&offset_expr, tempreg);
macro_build (&offset_expr, ADDRESS_ADDI_INSN, "t,r,j",
tempreg, tempreg, BFD_RELOC_LO16);
if (mips_relax.sequence)
relax_end ();
}
}
else if (mips_pic == SVR4_PIC && ! mips_big_got && ! HAVE_NEWABI)
{
int lw_reloc_type = (int) BFD_RELOC_MIPS_GOT16;
/* If this is a reference to an external symbol, and there
is no constant, we want
lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_GOT16)
or for lca or if tempreg is PIC_CALL_REG
lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_CALL16)
For a local symbol, we want
lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_GOT16)
nop
addiu $tempreg,$tempreg,<sym> (BFD_RELOC_LO16)
If we have a small constant, and this is a reference to
an external symbol, we want
lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_GOT16)
nop
addiu $tempreg,$tempreg,<constant>
For a local symbol, we want the same instruction
sequence, but we output a BFD_RELOC_LO16 reloc on the
addiu instruction.
If we have a large constant, and this is a reference to
an external symbol, we want
lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_GOT16)
lui $at,<hiconstant>
addiu $at,$at,<loconstant>
addu $tempreg,$tempreg,$at
For a local symbol, we want the same instruction
sequence, but we output a BFD_RELOC_LO16 reloc on the
addiu instruction.
*/
if (offset_expr.X_add_number == 0)
{
if (breg == 0 && (call || tempreg == PIC_CALL_REG))
lw_reloc_type = (int) BFD_RELOC_MIPS_CALL16;
relax_start (offset_expr.X_add_symbol);
macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg,
lw_reloc_type, mips_gp_register);
if (breg != 0)
{
/* We're going to put in an addu instruction using
tempreg, so we may as well insert the nop right
now. */
load_delay_nop ();
}
relax_switch ();
macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)",
tempreg, BFD_RELOC_MIPS_GOT16, mips_gp_register);
load_delay_nop ();
macro_build (&offset_expr, ADDRESS_ADDI_INSN, "t,r,j",
tempreg, tempreg, BFD_RELOC_LO16);
relax_end ();
/* FIXME: If breg == 0, and the next instruction uses
$tempreg, then if this variant case is used an extra
nop will be generated. */
}
else if (offset_expr.X_add_number >= -0x8000
&& offset_expr.X_add_number < 0x8000)
{
load_got_offset (tempreg, &offset_expr);
load_delay_nop ();
add_got_offset (tempreg, &offset_expr);
}
else
{
expr1.X_add_number = offset_expr.X_add_number;
offset_expr.X_add_number =
((offset_expr.X_add_number + 0x8000) & 0xffff) - 0x8000;
load_got_offset (tempreg, &offset_expr);
offset_expr.X_add_number = expr1.X_add_number;
/* If we are going to add in a base register, and the
target register and the base register are the same,
then we are using AT as a temporary register. Since
we want to load the constant into AT, we add our
current AT (from the global offset table) and the
register into the register now, and pretend we were
not using a base register. */
if (breg == treg)
{
load_delay_nop ();
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t",
treg, AT, breg);
breg = 0;
tempreg = treg;
}
add_got_offset_hilo (tempreg, &offset_expr, AT);
used_at = 1;
}
}
else if (mips_pic == SVR4_PIC && ! mips_big_got && HAVE_NEWABI)
{
int add_breg_early = 0;
/* If this is a reference to an external, and there is no
constant, or local symbol (*), with or without a
constant, we want
lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_GOT_DISP)
or for lca or if tempreg is PIC_CALL_REG
lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_CALL16)
If we have a small constant, and this is a reference to
an external symbol, we want
lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_GOT_DISP)
addiu $tempreg,$tempreg,<constant>
If we have a large constant, and this is a reference to
an external symbol, we want
lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_GOT_DISP)
lui $at,<hiconstant>
addiu $at,$at,<loconstant>
addu $tempreg,$tempreg,$at
(*) Other assemblers seem to prefer GOT_PAGE/GOT_OFST for
local symbols, even though it introduces an additional
instruction. */
if (offset_expr.X_add_number)
{
expr1.X_add_number = offset_expr.X_add_number;
offset_expr.X_add_number = 0;
relax_start (offset_expr.X_add_symbol);
macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg,
BFD_RELOC_MIPS_GOT_DISP, mips_gp_register);
if (expr1.X_add_number >= -0x8000
&& expr1.X_add_number < 0x8000)
{
macro_build (&expr1, ADDRESS_ADDI_INSN, "t,r,j",
tempreg, tempreg, BFD_RELOC_LO16);
}
else if (IS_SEXT_32BIT_NUM (expr1.X_add_number + 0x8000))
{
int dreg;
/* If we are going to add in a base register, and the
target register and the base register are the same,
then we are using AT as a temporary register. Since
we want to load the constant into AT, we add our
current AT (from the global offset table) and the
register into the register now, and pretend we were
not using a base register. */
if (breg != treg)
dreg = tempreg;
else
{
assert (tempreg == AT);
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t",
treg, AT, breg);
dreg = treg;
add_breg_early = 1;
}
load_register (AT, &expr1, HAVE_64BIT_ADDRESSES);
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t",
dreg, dreg, AT);
used_at = 1;
}
else
as_bad (_("PIC code offset overflow (max 32 signed bits)"));
relax_switch ();
offset_expr.X_add_number = expr1.X_add_number;
macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg,
BFD_RELOC_MIPS_GOT_DISP, mips_gp_register);
if (add_breg_early)
{
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t",
treg, tempreg, breg);
breg = 0;
tempreg = treg;
}
relax_end ();
}
else if (breg == 0 && (call || tempreg == PIC_CALL_REG))
{
relax_start (offset_expr.X_add_symbol);
macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg,
BFD_RELOC_MIPS_CALL16, mips_gp_register);
relax_switch ();
macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg,
BFD_RELOC_MIPS_GOT_DISP, mips_gp_register);
relax_end ();
}
else
{
macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg,
BFD_RELOC_MIPS_GOT_DISP, mips_gp_register);
}
}
else if (mips_pic == SVR4_PIC && ! HAVE_NEWABI)
{
int gpdelay;
int lui_reloc_type = (int) BFD_RELOC_MIPS_GOT_HI16;
int lw_reloc_type = (int) BFD_RELOC_MIPS_GOT_LO16;
int local_reloc_type = (int) BFD_RELOC_MIPS_GOT16;
/* This is the large GOT case. If this is a reference to an
external symbol, and there is no constant, we want
lui $tempreg,<sym> (BFD_RELOC_MIPS_GOT_HI16)
addu $tempreg,$tempreg,$gp
lw $tempreg,<sym>($tempreg) (BFD_RELOC_MIPS_GOT_LO16)
or for lca or if tempreg is PIC_CALL_REG
lui $tempreg,<sym> (BFD_RELOC_MIPS_CALL_HI16)
addu $tempreg,$tempreg,$gp
lw $tempreg,<sym>($tempreg) (BFD_RELOC_MIPS_CALL_LO16)
For a local symbol, we want
lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_GOT16)
nop
addiu $tempreg,$tempreg,<sym> (BFD_RELOC_LO16)
If we have a small constant, and this is a reference to
an external symbol, we want
lui $tempreg,<sym> (BFD_RELOC_MIPS_GOT_HI16)
addu $tempreg,$tempreg,$gp
lw $tempreg,<sym>($tempreg) (BFD_RELOC_MIPS_GOT_LO16)
nop
addiu $tempreg,$tempreg,<constant>
For a local symbol, we want
lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_GOT16)
nop
addiu $tempreg,$tempreg,<constant> (BFD_RELOC_LO16)
If we have a large constant, and this is a reference to
an external symbol, we want
lui $tempreg,<sym> (BFD_RELOC_MIPS_GOT_HI16)
addu $tempreg,$tempreg,$gp
lw $tempreg,<sym>($tempreg) (BFD_RELOC_MIPS_GOT_LO16)
lui $at,<hiconstant>
addiu $at,$at,<loconstant>
addu $tempreg,$tempreg,$at
For a local symbol, we want
lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_GOT16)
lui $at,<hiconstant>
addiu $at,$at,<loconstant> (BFD_RELOC_LO16)
addu $tempreg,$tempreg,$at
*/
expr1.X_add_number = offset_expr.X_add_number;
offset_expr.X_add_number = 0;
relax_start (offset_expr.X_add_symbol);
gpdelay = reg_needs_delay (mips_gp_register);
if (expr1.X_add_number == 0 && breg == 0
&& (call || tempreg == PIC_CALL_REG))
{
lui_reloc_type = (int) BFD_RELOC_MIPS_CALL_HI16;
lw_reloc_type = (int) BFD_RELOC_MIPS_CALL_LO16;
}
macro_build (&offset_expr, "lui", "t,u", tempreg, lui_reloc_type);
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t",
tempreg, tempreg, mips_gp_register);
macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)",
tempreg, lw_reloc_type, tempreg);
if (expr1.X_add_number == 0)
{
if (breg != 0)
{
/* We're going to put in an addu instruction using
tempreg, so we may as well insert the nop right
now. */
load_delay_nop ();
}
}
else if (expr1.X_add_number >= -0x8000
&& expr1.X_add_number < 0x8000)
{
load_delay_nop ();
macro_build (&expr1, ADDRESS_ADDI_INSN, "t,r,j",
tempreg, tempreg, BFD_RELOC_LO16);
}
else
{
int dreg;
/* If we are going to add in a base register, and the
target register and the base register are the same,
then we are using AT as a temporary register. Since
we want to load the constant into AT, we add our
current AT (from the global offset table) and the
register into the register now, and pretend we were
not using a base register. */
if (breg != treg)
dreg = tempreg;
else
{
assert (tempreg == AT);
load_delay_nop ();
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t",
treg, AT, breg);
dreg = treg;
}
load_register (AT, &expr1, HAVE_64BIT_ADDRESSES);
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", dreg, dreg, AT);
used_at = 1;
}
offset_expr.X_add_number =
((expr1.X_add_number + 0x8000) & 0xffff) - 0x8000;
relax_switch ();
if (gpdelay)
{
/* This is needed because this instruction uses $gp, but
the first instruction on the main stream does not. */
macro_build (NULL, "nop", "");
}
macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg,
local_reloc_type, mips_gp_register);
if (expr1.X_add_number >= -0x8000
&& expr1.X_add_number < 0x8000)
{
load_delay_nop ();
macro_build (&offset_expr, ADDRESS_ADDI_INSN, "t,r,j",
tempreg, tempreg, BFD_RELOC_LO16);
/* FIXME: If add_number is 0, and there was no base
register, the external symbol case ended with a load,
so if the symbol turns out to not be external, and
the next instruction uses tempreg, an unnecessary nop
will be inserted. */
}
else
{
if (breg == treg)
{
/* We must add in the base register now, as in the
external symbol case. */
assert (tempreg == AT);
load_delay_nop ();
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t",
treg, AT, breg);
tempreg = treg;
/* We set breg to 0 because we have arranged to add
it in in both cases. */
breg = 0;
}
macro_build_lui (&expr1, AT);
macro_build (&offset_expr, ADDRESS_ADDI_INSN, "t,r,j",
AT, AT, BFD_RELOC_LO16);
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t",
tempreg, tempreg, AT);
}
relax_end ();
}
else if (mips_pic == SVR4_PIC && HAVE_NEWABI)
{
int lui_reloc_type = (int) BFD_RELOC_MIPS_GOT_HI16;
int lw_reloc_type = (int) BFD_RELOC_MIPS_GOT_LO16;
int add_breg_early = 0;
/* This is the large GOT case. If this is a reference to an
external symbol, and there is no constant, we want
lui $tempreg,<sym> (BFD_RELOC_MIPS_GOT_HI16)
add $tempreg,$tempreg,$gp
lw $tempreg,<sym>($tempreg) (BFD_RELOC_MIPS_GOT_LO16)
or for lca or if tempreg is PIC_CALL_REG
lui $tempreg,<sym> (BFD_RELOC_MIPS_CALL_HI16)
add $tempreg,$tempreg,$gp
lw $tempreg,<sym>($tempreg) (BFD_RELOC_MIPS_CALL_LO16)
If we have a small constant, and this is a reference to
an external symbol, we want
lui $tempreg,<sym> (BFD_RELOC_MIPS_GOT_HI16)
add $tempreg,$tempreg,$gp
lw $tempreg,<sym>($tempreg) (BFD_RELOC_MIPS_GOT_LO16)
addi $tempreg,$tempreg,<constant>
If we have a large constant, and this is a reference to
an external symbol, we want
lui $tempreg,<sym> (BFD_RELOC_MIPS_GOT_HI16)
addu $tempreg,$tempreg,$gp
lw $tempreg,<sym>($tempreg) (BFD_RELOC_MIPS_GOT_LO16)
lui $at,<hiconstant>
addi $at,$at,<loconstant>
add $tempreg,$tempreg,$at
If we have NewABI, and we know it's a local symbol, we want
lw $reg,<sym>($gp) (BFD_RELOC_MIPS_GOT_PAGE)
addiu $reg,$reg,<sym> (BFD_RELOC_MIPS_GOT_OFST)
otherwise we have to resort to GOT_HI16/GOT_LO16. */
relax_start (offset_expr.X_add_symbol);
expr1.X_add_number = offset_expr.X_add_number;
offset_expr.X_add_number = 0;
if (expr1.X_add_number == 0 && breg == 0
&& (call || tempreg == PIC_CALL_REG))
{
lui_reloc_type = (int) BFD_RELOC_MIPS_CALL_HI16;
lw_reloc_type = (int) BFD_RELOC_MIPS_CALL_LO16;
}
macro_build (&offset_expr, "lui", "t,u", tempreg, lui_reloc_type);
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t",
tempreg, tempreg, mips_gp_register);
macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)",
tempreg, lw_reloc_type, tempreg);
if (expr1.X_add_number == 0)
;
else if (expr1.X_add_number >= -0x8000
&& expr1.X_add_number < 0x8000)
{
macro_build (&expr1, ADDRESS_ADDI_INSN, "t,r,j",
tempreg, tempreg, BFD_RELOC_LO16);
}
else if (IS_SEXT_32BIT_NUM (expr1.X_add_number + 0x8000))
{
int dreg;
/* If we are going to add in a base register, and the
target register and the base register are the same,
then we are using AT as a temporary register. Since
we want to load the constant into AT, we add our
current AT (from the global offset table) and the
register into the register now, and pretend we were
not using a base register. */
if (breg != treg)
dreg = tempreg;
else
{
assert (tempreg == AT);
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t",
treg, AT, breg);
dreg = treg;
add_breg_early = 1;
}
load_register (AT, &expr1, HAVE_64BIT_ADDRESSES);
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", dreg, dreg, AT);
used_at = 1;
}
else
as_bad (_("PIC code offset overflow (max 32 signed bits)"));
relax_switch ();
offset_expr.X_add_number = expr1.X_add_number;
macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg,
BFD_RELOC_MIPS_GOT_PAGE, mips_gp_register);
macro_build (&offset_expr, ADDRESS_ADDI_INSN, "t,r,j", tempreg,
tempreg, BFD_RELOC_MIPS_GOT_OFST);
if (add_breg_early)
{
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t",
treg, tempreg, breg);
breg = 0;
tempreg = treg;
}
relax_end ();
}
else
abort ();
if (breg != 0)
{
char *s;
if (mips_pic == NO_PIC)
s = (dbl || HAVE_64BIT_ADDRESSES) ? "daddu" : "addu";
else
s = ADDRESS_ADD_INSN;
macro_build (NULL, s, "d,v,t", treg, tempreg, breg);
}
if (! used_at)
return;
break;
case M_J_A:
/* The j instruction may not be used in PIC code, since it
requires an absolute address. We convert it to a b
instruction. */
if (mips_pic == NO_PIC)
macro_build (&offset_expr, "j", "a");
else
macro_build (&offset_expr, "b", "p");
return;
/* The jal instructions must be handled as macros because when
generating PIC code they expand to multi-instruction
sequences. Normally they are simple instructions. */
case M_JAL_1:
dreg = RA;
/* Fall through. */
case M_JAL_2:
if (mips_pic == NO_PIC)
macro_build (NULL, "jalr", "d,s", dreg, sreg);
else if (mips_pic == SVR4_PIC)
{
if (sreg != PIC_CALL_REG)
as_warn (_("MIPS PIC call to register other than $25"));
macro_build (NULL, "jalr", "d,s", dreg, sreg);
if (! HAVE_NEWABI)
{
if (mips_cprestore_offset < 0)
as_warn (_("No .cprestore pseudo-op used in PIC code"));
else
{
if (! mips_frame_reg_valid)
{
as_warn (_("No .frame pseudo-op used in PIC code"));
/* Quiet this warning. */
mips_frame_reg_valid = 1;
}
if (! mips_cprestore_valid)
{
as_warn (_("No .cprestore pseudo-op used in PIC code"));
/* Quiet this warning. */
mips_cprestore_valid = 1;
}
expr1.X_add_number = mips_cprestore_offset;
macro_build_ldst_constoffset (&expr1, ADDRESS_LOAD_INSN,
mips_gp_register,
mips_frame_reg,
HAVE_64BIT_ADDRESSES);
}
}
}
else
abort ();
return;
case M_JAL_A:
if (mips_pic == NO_PIC)
macro_build (&offset_expr, "jal", "a");
else if (mips_pic == SVR4_PIC)
{
/* If this is a reference to an external symbol, and we are
using a small GOT, we want
lw $25,<sym>($gp) (BFD_RELOC_MIPS_CALL16)
nop
jalr $ra,$25
nop
lw $gp,cprestore($sp)
The cprestore value is set using the .cprestore
pseudo-op. If we are using a big GOT, we want
lui $25,<sym> (BFD_RELOC_MIPS_CALL_HI16)
addu $25,$25,$gp
lw $25,<sym>($25) (BFD_RELOC_MIPS_CALL_LO16)
nop
jalr $ra,$25
nop
lw $gp,cprestore($sp)
If the symbol is not external, we want
lw $25,<sym>($gp) (BFD_RELOC_MIPS_GOT16)
nop
addiu $25,$25,<sym> (BFD_RELOC_LO16)
jalr $ra,$25
nop
lw $gp,cprestore($sp)
For NewABI, we use the same CALL16 or CALL_HI16/CALL_LO16
sequences above, minus nops, unless the symbol is local,
which enables us to use GOT_PAGE/GOT_OFST (big got) or
GOT_DISP. */
if (HAVE_NEWABI)
{
if (! mips_big_got)
{
relax_start (offset_expr.X_add_symbol);
macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)",
PIC_CALL_REG, BFD_RELOC_MIPS_CALL16,
mips_gp_register);
relax_switch ();
macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)",
PIC_CALL_REG, BFD_RELOC_MIPS_GOT_DISP,
mips_gp_register);
relax_end ();
}
else
{
relax_start (offset_expr.X_add_symbol);
macro_build (&offset_expr, "lui", "t,u", PIC_CALL_REG,
BFD_RELOC_MIPS_CALL_HI16);
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", PIC_CALL_REG,
PIC_CALL_REG, mips_gp_register);
macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)",
PIC_CALL_REG, BFD_RELOC_MIPS_CALL_LO16,
PIC_CALL_REG);
relax_switch ();
macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)",
PIC_CALL_REG, BFD_RELOC_MIPS_GOT_PAGE,
mips_gp_register);
macro_build (&offset_expr, ADDRESS_ADDI_INSN, "t,r,j",
PIC_CALL_REG, PIC_CALL_REG,
BFD_RELOC_MIPS_GOT_OFST);
relax_end ();
}
macro_build_jalr (&offset_expr);
}
else
{
relax_start (offset_expr.X_add_symbol);
if (! mips_big_got)
{
macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)",
PIC_CALL_REG, BFD_RELOC_MIPS_CALL16,
mips_gp_register);
load_delay_nop ();
relax_switch ();
}
else
{
int gpdelay;
gpdelay = reg_needs_delay (mips_gp_register);
macro_build (&offset_expr, "lui", "t,u", PIC_CALL_REG,
BFD_RELOC_MIPS_CALL_HI16);
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", PIC_CALL_REG,
PIC_CALL_REG, mips_gp_register);
macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)",
PIC_CALL_REG, BFD_RELOC_MIPS_CALL_LO16,
PIC_CALL_REG);
load_delay_nop ();
relax_switch ();
if (gpdelay)
macro_build (NULL, "nop", "");
}
macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)",
PIC_CALL_REG, BFD_RELOC_MIPS_GOT16,
mips_gp_register);
load_delay_nop ();
macro_build (&offset_expr, ADDRESS_ADDI_INSN, "t,r,j",
PIC_CALL_REG, PIC_CALL_REG, BFD_RELOC_LO16);
relax_end ();
macro_build_jalr (&offset_expr);
if (mips_cprestore_offset < 0)
as_warn (_("No .cprestore pseudo-op used in PIC code"));
else
{
if (! mips_frame_reg_valid)
{
as_warn (_("No .frame pseudo-op used in PIC code"));
/* Quiet this warning. */
mips_frame_reg_valid = 1;
}
if (! mips_cprestore_valid)
{
as_warn (_("No .cprestore pseudo-op used in PIC code"));
/* Quiet this warning. */
mips_cprestore_valid = 1;
}
if (mips_opts.noreorder)
macro_build (NULL, "nop", "");
expr1.X_add_number = mips_cprestore_offset;
macro_build_ldst_constoffset (&expr1, ADDRESS_LOAD_INSN,
mips_gp_register,
mips_frame_reg,
HAVE_64BIT_ADDRESSES);
}
}
}
else
abort ();
return;
case M_LB_AB:
s = "lb";
goto ld;
case M_LBU_AB:
s = "lbu";
goto ld;
case M_LH_AB:
s = "lh";
goto ld;
case M_LHU_AB:
s = "lhu";
goto ld;
case M_LW_AB:
s = "lw";
goto ld;
case M_LWC0_AB:
s = "lwc0";
/* Itbl support may require additional care here. */
coproc = 1;
goto ld;
case M_LWC1_AB:
s = "lwc1";
/* Itbl support may require additional care here. */
coproc = 1;
goto ld;
case M_LWC2_AB:
s = "lwc2";
/* Itbl support may require additional care here. */
coproc = 1;
goto ld;
case M_LWC3_AB:
s = "lwc3";
/* Itbl support may require additional care here. */
coproc = 1;
goto ld;
case M_LWL_AB:
s = "lwl";
lr = 1;
goto ld;
case M_LWR_AB:
s = "lwr";
lr = 1;
goto ld;
case M_LDC1_AB:
if (mips_opts.arch == CPU_R4650)
{
as_bad (_("opcode not supported on this processor"));
return;
}
s = "ldc1";
/* Itbl support may require additional care here. */
coproc = 1;
goto ld;
case M_LDC2_AB:
s = "ldc2";
/* Itbl support may require additional care here. */
coproc = 1;
goto ld;
case M_LDC3_AB:
s = "ldc3";
/* Itbl support may require additional care here. */
coproc = 1;
goto ld;
case M_LDL_AB:
s = "ldl";
lr = 1;
goto ld;
case M_LDR_AB:
s = "ldr";
lr = 1;
goto ld;
case M_LL_AB:
s = "ll";
goto ld;
case M_LLD_AB:
s = "lld";
goto ld;
case M_LWU_AB:
s = "lwu";
ld:
if (breg == treg || coproc || lr)
{
tempreg = AT;
used_at = 1;
}
else
{
tempreg = treg;
used_at = 0;
}
goto ld_st;
case M_SB_AB:
s = "sb";
goto st;
case M_SH_AB:
s = "sh";
goto st;
case M_SW_AB:
s = "sw";
goto st;
case M_SWC0_AB:
s = "swc0";
/* Itbl support may require additional care here. */
coproc = 1;
goto st;
case M_SWC1_AB:
s = "swc1";
/* Itbl support may require additional care here. */
coproc = 1;
goto st;
case M_SWC2_AB:
s = "swc2";
/* Itbl support may require additional care here. */
coproc = 1;
goto st;
case M_SWC3_AB:
s = "swc3";
/* Itbl support may require additional care here. */
coproc = 1;
goto st;
case M_SWL_AB:
s = "swl";
goto st;
case M_SWR_AB:
s = "swr";
goto st;
case M_SC_AB:
s = "sc";
goto st;
case M_SCD_AB:
s = "scd";
goto st;
case M_SDC1_AB:
if (mips_opts.arch == CPU_R4650)
{
as_bad (_("opcode not supported on this processor"));
return;
}
s = "sdc1";
coproc = 1;
/* Itbl support may require additional care here. */
goto st;
case M_SDC2_AB:
s = "sdc2";
/* Itbl support may require additional care here. */
coproc = 1;
goto st;
case M_SDC3_AB:
s = "sdc3";
/* Itbl support may require additional care here. */
coproc = 1;
goto st;
case M_SDL_AB:
s = "sdl";
goto st;
case M_SDR_AB:
s = "sdr";
st:
tempreg = AT;
used_at = 1;
ld_st:
/* Itbl support may require additional care here. */
if (mask == M_LWC1_AB
|| mask == M_SWC1_AB
|| mask == M_LDC1_AB
|| mask == M_SDC1_AB
|| mask == M_L_DAB
|| mask == M_S_DAB)
fmt = "T,o(b)";
else if (coproc)
fmt = "E,o(b)";
else
fmt = "t,o(b)";
/* Sign-extending 32-bit constants makes their handling easier.
The HAVE_64BIT_GPRS... part is due to the linux kernel hack
described below. */
if ((! HAVE_64BIT_ADDRESSES
&& (! HAVE_64BIT_GPRS && offset_expr.X_op == O_constant))
&& (offset_expr.X_op == O_constant)
&& ! ((offset_expr.X_add_number & ~((bfd_vma) 0x7fffffff))
== ~((bfd_vma) 0x7fffffff)))
{
if (offset_expr.X_add_number & ~((bfd_vma) 0xffffffff))
as_bad (_("constant too large"));
offset_expr.X_add_number = (((offset_expr.X_add_number & 0xffffffff)
^ 0x80000000) - 0x80000000);
}
if (offset_expr.X_op != O_constant
&& offset_expr.X_op != O_symbol)
{
as_bad (_("expression too complex"));
offset_expr.X_op = O_constant;
}
/* A constant expression in PIC code can be handled just as it
is in non PIC code. */
if (mips_pic == NO_PIC
|| offset_expr.X_op == O_constant)
{
/* If this is a reference to a GP relative symbol, and there
is no base register, we want
<op> $treg,<sym>($gp) (BFD_RELOC_GPREL16)
Otherwise, if there is no base register, we want
lui $tempreg,<sym> (BFD_RELOC_HI16_S)
<op> $treg,<sym>($tempreg) (BFD_RELOC_LO16)
If we have a constant, we need two instructions anyhow,
so we always use the latter form.
If we have a base register, and this is a reference to a
GP relative symbol, we want
addu $tempreg,$breg,$gp
<op> $treg,<sym>($tempreg) (BFD_RELOC_GPREL16)
Otherwise we want
lui $tempreg,<sym> (BFD_RELOC_HI16_S)
addu $tempreg,$tempreg,$breg
<op> $treg,<sym>($tempreg) (BFD_RELOC_LO16)
With a constant we always use the latter case.
With 64bit address space and no base register and $at usable,
we want
lui $tempreg,<sym> (BFD_RELOC_MIPS_HIGHEST)
lui $at,<sym> (BFD_RELOC_HI16_S)
daddiu $tempreg,<sym> (BFD_RELOC_MIPS_HIGHER)
dsll32 $tempreg,0
daddu $tempreg,$at
<op> $treg,<sym>($tempreg) (BFD_RELOC_LO16)
If we have a base register, we want
lui $tempreg,<sym> (BFD_RELOC_MIPS_HIGHEST)
lui $at,<sym> (BFD_RELOC_HI16_S)
daddiu $tempreg,<sym> (BFD_RELOC_MIPS_HIGHER)
daddu $at,$breg
dsll32 $tempreg,0
daddu $tempreg,$at
<op> $treg,<sym>($tempreg) (BFD_RELOC_LO16)
Without $at we can't generate the optimal path for superscalar
processors here since this would require two temporary registers.
lui $tempreg,<sym> (BFD_RELOC_MIPS_HIGHEST)
daddiu $tempreg,<sym> (BFD_RELOC_MIPS_HIGHER)
dsll $tempreg,16
daddiu $tempreg,<sym> (BFD_RELOC_HI16_S)
dsll $tempreg,16
<op> $treg,<sym>($tempreg) (BFD_RELOC_LO16)
If we have a base register, we want
lui $tempreg,<sym> (BFD_RELOC_MIPS_HIGHEST)
daddiu $tempreg,<sym> (BFD_RELOC_MIPS_HIGHER)
dsll $tempreg,16
daddiu $tempreg,<sym> (BFD_RELOC_HI16_S)
dsll $tempreg,16
daddu $tempreg,$tempreg,$breg
<op> $treg,<sym>($tempreg) (BFD_RELOC_LO16)
If we have 64-bit addresses, as an optimization, for
addresses which are 32-bit constants (e.g. kseg0/kseg1
addresses) we fall back to the 32-bit address generation
mechanism since it is more efficient. Note that due to
the signed offset used by memory operations, the 32-bit
range is shifted down by 32768 here. This code should
probably attempt to generate 64-bit constants more
efficiently in general.
As an extension for architectures with 64-bit registers,
we don't truncate 64-bit addresses given as literal
constants down to 32 bits, to support existing practice
in the mips64 Linux (the kernel), that compiles source
files with -mabi=64, assembling them as o32 or n32 (with
-Wa,-32 or -Wa,-n32). This is not beautiful, but since
the whole kernel is loaded into a memory region that is
addressable with sign-extended 32-bit addresses, it is
wasteful to compute the upper 32 bits of every
non-literal address, that takes more space and time.
Some day this should probably be implemented as an
assembler option, such that the kernel doesn't have to
use such ugly hacks, even though it will still have to
end up converting the binary to ELF32 for a number of
platforms whose boot loaders don't support ELF64
binaries. */
if ((HAVE_64BIT_ADDRESSES
&& ! (offset_expr.X_op == O_constant
&& IS_SEXT_32BIT_NUM (offset_expr.X_add_number + 0x8000)))
|| (HAVE_64BIT_GPRS
&& offset_expr.X_op == O_constant
&& ! IS_SEXT_32BIT_NUM (offset_expr.X_add_number + 0x8000)))
{
/* ??? We don't provide a GP-relative alternative for
these macros. It used not to be possible with the
original relaxation code, but it could be done now. */
if (used_at == 0 && ! mips_opts.noat)
{
macro_build (&offset_expr, "lui", "t,u", tempreg,
BFD_RELOC_MIPS_HIGHEST);
macro_build (&offset_expr, "lui", "t,u", AT,
BFD_RELOC_HI16_S);
macro_build (&offset_expr, "daddiu", "t,r,j", tempreg,
tempreg, BFD_RELOC_MIPS_HIGHER);
if (breg != 0)
macro_build (NULL, "daddu", "d,v,t", AT, AT, breg);
macro_build (NULL, "dsll32", "d,w,<", tempreg, tempreg, 0);
macro_build (NULL, "daddu", "d,v,t", tempreg, tempreg, AT);
macro_build (&offset_expr, s, fmt, treg, BFD_RELOC_LO16,
tempreg);
used_at = 1;
}
else
{
macro_build (&offset_expr, "lui", "t,u", tempreg,
BFD_RELOC_MIPS_HIGHEST);
macro_build (&offset_expr, "daddiu", "t,r,j", tempreg,
tempreg, BFD_RELOC_MIPS_HIGHER);
macro_build (NULL, "dsll", "d,w,<", tempreg, tempreg, 16);
macro_build (&offset_expr, "daddiu", "t,r,j", tempreg,
tempreg, BFD_RELOC_HI16_S);
macro_build (NULL, "dsll", "d,w,<", tempreg, tempreg, 16);
if (breg != 0)
macro_build (NULL, "daddu", "d,v,t",
tempreg, tempreg, breg);
macro_build (&offset_expr, s, fmt, treg,
BFD_RELOC_LO16, tempreg);
}
return;
}
if (offset_expr.X_op == O_constant
&& ! IS_SEXT_32BIT_NUM (offset_expr.X_add_number + 0x8000))
as_bad (_("load/store address overflow (max 32 bits)"));
if (breg == 0)
{
if ((valueT) offset_expr.X_add_number <= MAX_GPREL_OFFSET
&& ! nopic_need_relax (offset_expr.X_add_symbol, 1))
{
relax_start (offset_expr.X_add_symbol);
macro_build (&offset_expr, s, fmt, treg, BFD_RELOC_GPREL16,
mips_gp_register);
relax_switch ();
used_at = 0;
}
macro_build_lui (&offset_expr, tempreg);
macro_build (&offset_expr, s, fmt, treg,
BFD_RELOC_LO16, tempreg);
if (mips_relax.sequence)
relax_end ();
}
else
{
if ((valueT) offset_expr.X_add_number <= MAX_GPREL_OFFSET
&& ! nopic_need_relax (offset_expr.X_add_symbol, 1))
{
relax_start (offset_expr.X_add_symbol);
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t",
tempreg, breg, mips_gp_register);
macro_build (&offset_expr, s, fmt, treg,
BFD_RELOC_GPREL16, tempreg);
relax_switch ();
}
macro_build_lui (&offset_expr, tempreg);
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t",
tempreg, tempreg, breg);
macro_build (&offset_expr, s, fmt, treg,
BFD_RELOC_LO16, tempreg);
if (mips_relax.sequence)
relax_end ();
}
}
else if (mips_pic == SVR4_PIC && ! mips_big_got)
{
int lw_reloc_type = (int) BFD_RELOC_MIPS_GOT16;
/* If this is a reference to an external symbol, we want
lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_GOT16)
nop
<op> $treg,0($tempreg)
Otherwise we want
lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_GOT16)
nop
addiu $tempreg,$tempreg,<sym> (BFD_RELOC_LO16)
<op> $treg,0($tempreg)
For NewABI, we want
lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_GOT_PAGE)
<op> $treg,<sym>($tempreg) (BFD_RELOC_MIPS_GOT_OFST)
If there is a base register, we add it to $tempreg before
the <op>. If there is a constant, we stick it in the
<op> instruction. We don't handle constants larger than
16 bits, because we have no way to load the upper 16 bits
(actually, we could handle them for the subset of cases
in which we are not using $at). */
assert (offset_expr.X_op == O_symbol);
if (HAVE_NEWABI)
{
macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg,
BFD_RELOC_MIPS_GOT_PAGE, mips_gp_register);
if (breg != 0)
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t",
tempreg, tempreg, breg);
macro_build (&offset_expr, s, fmt, treg,
BFD_RELOC_MIPS_GOT_OFST, tempreg);
if (! used_at)
return;
break;
}
expr1.X_add_number = offset_expr.X_add_number;
offset_expr.X_add_number = 0;
if (expr1.X_add_number < -0x8000
|| expr1.X_add_number >= 0x8000)
as_bad (_("PIC code offset overflow (max 16 signed bits)"));
macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg,
lw_reloc_type, mips_gp_register);
load_delay_nop ();
relax_start (offset_expr.X_add_symbol);
relax_switch ();
macro_build (&offset_expr, ADDRESS_ADDI_INSN, "t,r,j", tempreg,
tempreg, BFD_RELOC_LO16);
relax_end ();
if (breg != 0)
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t",
tempreg, tempreg, breg);
macro_build (&expr1, s, fmt, treg, BFD_RELOC_LO16, tempreg);
}
else if (mips_pic == SVR4_PIC && ! HAVE_NEWABI)
{
int gpdelay;
/* If this is a reference to an external symbol, we want
lui $tempreg,<sym> (BFD_RELOC_MIPS_GOT_HI16)
addu $tempreg,$tempreg,$gp
lw $tempreg,<sym>($tempreg) (BFD_RELOC_MIPS_GOT_LO16)
<op> $treg,0($tempreg)
Otherwise we want
lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_GOT16)
nop
addiu $tempreg,$tempreg,<sym> (BFD_RELOC_LO16)
<op> $treg,0($tempreg)
If there is a base register, we add it to $tempreg before
the <op>. If there is a constant, we stick it in the
<op> instruction. We don't handle constants larger than
16 bits, because we have no way to load the upper 16 bits
(actually, we could handle them for the subset of cases
in which we are not using $at). */
assert (offset_expr.X_op == O_symbol);
expr1.X_add_number = offset_expr.X_add_number;
offset_expr.X_add_number = 0;
if (expr1.X_add_number < -0x8000
|| expr1.X_add_number >= 0x8000)
as_bad (_("PIC code offset overflow (max 16 signed bits)"));
gpdelay = reg_needs_delay (mips_gp_register);
relax_start (offset_expr.X_add_symbol);
macro_build (&offset_expr, "lui", "t,u", tempreg,
BFD_RELOC_MIPS_GOT_HI16);
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", tempreg, tempreg,
mips_gp_register);
macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg,
BFD_RELOC_MIPS_GOT_LO16, tempreg);
relax_switch ();
if (gpdelay)
macro_build (NULL, "nop", "");
macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg,
BFD_RELOC_MIPS_GOT16, mips_gp_register);
load_delay_nop ();
macro_build (&offset_expr, ADDRESS_ADDI_INSN, "t,r,j", tempreg,
tempreg, BFD_RELOC_LO16);
relax_end ();
if (breg != 0)
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t",
tempreg, tempreg, breg);
macro_build (&expr1, s, fmt, treg, BFD_RELOC_LO16, tempreg);
}
else if (mips_pic == SVR4_PIC && HAVE_NEWABI)
{
/* If this is a reference to an external symbol, we want
lui $tempreg,<sym> (BFD_RELOC_MIPS_GOT_HI16)
add $tempreg,$tempreg,$gp
lw $tempreg,<sym>($tempreg) (BFD_RELOC_MIPS_GOT_LO16)
<op> $treg,<ofst>($tempreg)
Otherwise, for local symbols, we want:
lw $tempreg,<sym>($gp) (BFD_RELOC_MIPS_GOT_PAGE)
<op> $treg,<sym>($tempreg) (BFD_RELOC_MIPS_GOT_OFST) */
assert (offset_expr.X_op == O_symbol);
expr1.X_add_number = offset_expr.X_add_number;
offset_expr.X_add_number = 0;
if (expr1.X_add_number < -0x8000
|| expr1.X_add_number >= 0x8000)
as_bad (_("PIC code offset overflow (max 16 signed bits)"));
relax_start (offset_expr.X_add_symbol);
macro_build (&offset_expr, "lui", "t,u", tempreg,
BFD_RELOC_MIPS_GOT_HI16);
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", tempreg, tempreg,
mips_gp_register);
macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg,
BFD_RELOC_MIPS_GOT_LO16, tempreg);
if (breg != 0)
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t",
tempreg, tempreg, breg);
macro_build (&expr1, s, fmt, treg, BFD_RELOC_LO16, tempreg);
relax_switch ();
offset_expr.X_add_number = expr1.X_add_number;
macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", tempreg,
BFD_RELOC_MIPS_GOT_PAGE, mips_gp_register);
if (breg != 0)
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t",
tempreg, tempreg, breg);
macro_build (&offset_expr, s, fmt, treg,
BFD_RELOC_MIPS_GOT_OFST, tempreg);
relax_end ();
}
else
abort ();
if (! used_at)
return;
break;
case M_LI:
case M_LI_S:
load_register (treg, &imm_expr, 0);
return;
case M_DLI:
load_register (treg, &imm_expr, 1);
return;
case M_LI_SS:
if (imm_expr.X_op == O_constant)
{
load_register (AT, &imm_expr, 0);
macro_build (NULL, "mtc1", "t,G", AT, treg);
break;
}
else
{
assert (offset_expr.X_op == O_symbol
&& strcmp (segment_name (S_GET_SEGMENT
(offset_expr.X_add_symbol)),
".lit4") == 0
&& offset_expr.X_add_number == 0);
macro_build (&offset_expr, "lwc1", "T,o(b)", treg,
BFD_RELOC_MIPS_LITERAL, mips_gp_register);
return;
}
case M_LI_D:
/* Check if we have a constant in IMM_EXPR. If the GPRs are 64 bits
wide, IMM_EXPR is the entire value. Otherwise IMM_EXPR is the high
order 32 bits of the value and the low order 32 bits are either
zero or in OFFSET_EXPR. */
if (imm_expr.X_op == O_constant || imm_expr.X_op == O_big)
{
if (HAVE_64BIT_GPRS)
load_register (treg, &imm_expr, 1);
else
{
int hreg, lreg;
if (target_big_endian)
{
hreg = treg;
lreg = treg + 1;
}
else
{
hreg = treg + 1;
lreg = treg;
}
if (hreg <= 31)
load_register (hreg, &imm_expr, 0);
if (lreg <= 31)
{
if (offset_expr.X_op == O_absent)
move_register (lreg, 0);
else
{
assert (offset_expr.X_op == O_constant);
load_register (lreg, &offset_expr, 0);
}
}
}
return;
}
/* We know that sym is in the .rdata section. First we get the
upper 16 bits of the address. */
if (mips_pic == NO_PIC)
{
macro_build_lui (&offset_expr, AT);
}
else if (mips_pic == SVR4_PIC)
{
macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", AT,
BFD_RELOC_MIPS_GOT16, mips_gp_register);
}
else
abort ();
/* Now we load the register(s). */
if (HAVE_64BIT_GPRS)
macro_build (&offset_expr, "ld", "t,o(b)", treg, BFD_RELOC_LO16, AT);
else
{
macro_build (&offset_expr, "lw", "t,o(b)", treg, BFD_RELOC_LO16, AT);
if (treg != RA)
{
/* FIXME: How in the world do we deal with the possible
overflow here? */
offset_expr.X_add_number += 4;
macro_build (&offset_expr, "lw", "t,o(b)",
treg + 1, BFD_RELOC_LO16, AT);
}
}
break;
case M_LI_DD:
/* Check if we have a constant in IMM_EXPR. If the FPRs are 64 bits
wide, IMM_EXPR is the entire value and the GPRs are known to be 64
bits wide as well. Otherwise IMM_EXPR is the high order 32 bits of
the value and the low order 32 bits are either zero or in
OFFSET_EXPR. */
if (imm_expr.X_op == O_constant || imm_expr.X_op == O_big)
{
load_register (AT, &imm_expr, HAVE_64BIT_FPRS);
if (HAVE_64BIT_FPRS)
{
assert (HAVE_64BIT_GPRS);
macro_build (NULL, "dmtc1", "t,S", AT, treg);
}
else
{
macro_build (NULL, "mtc1", "t,G", AT, treg + 1);
if (offset_expr.X_op == O_absent)
macro_build (NULL, "mtc1", "t,G", 0, treg);
else
{
assert (offset_expr.X_op == O_constant);
load_register (AT, &offset_expr, 0);
macro_build (NULL, "mtc1", "t,G", AT, treg);
}
}
break;
}
assert (offset_expr.X_op == O_symbol
&& offset_expr.X_add_number == 0);
s = segment_name (S_GET_SEGMENT (offset_expr.X_add_symbol));
if (strcmp (s, ".lit8") == 0)
{
if (mips_opts.isa != ISA_MIPS1)
{
macro_build (&offset_expr, "ldc1", "T,o(b)", treg,
BFD_RELOC_MIPS_LITERAL, mips_gp_register);
return;
}
breg = mips_gp_register;
r = BFD_RELOC_MIPS_LITERAL;
goto dob;
}
else
{
assert (strcmp (s, RDATA_SECTION_NAME) == 0);
if (mips_pic == SVR4_PIC)
macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", AT,
BFD_RELOC_MIPS_GOT16, mips_gp_register);
else
{
/* FIXME: This won't work for a 64 bit address. */
macro_build_lui (&offset_expr, AT);
}
if (mips_opts.isa != ISA_MIPS1)
{
macro_build (&offset_expr, "ldc1", "T,o(b)",
treg, BFD_RELOC_LO16, AT);
break;
}
breg = AT;
r = BFD_RELOC_LO16;
goto dob;
}
case M_L_DOB:
if (mips_opts.arch == CPU_R4650)
{
as_bad (_("opcode not supported on this processor"));
return;
}
/* Even on a big endian machine $fn comes before $fn+1. We have
to adjust when loading from memory. */
r = BFD_RELOC_LO16;
dob:
assert (mips_opts.isa == ISA_MIPS1);
macro_build (&offset_expr, "lwc1", "T,o(b)",
target_big_endian ? treg + 1 : treg, r, breg);
/* FIXME: A possible overflow which I don't know how to deal
with. */
offset_expr.X_add_number += 4;
macro_build (&offset_expr, "lwc1", "T,o(b)",
target_big_endian ? treg : treg + 1, r, breg);
if (breg != AT)
return;
break;
case M_L_DAB:
/*
* The MIPS assembler seems to check for X_add_number not
* being double aligned and generating:
* lui at,%hi(foo+1)
* addu at,at,v1
* addiu at,at,%lo(foo+1)
* lwc1 f2,0(at)
* lwc1 f3,4(at)
* But, the resulting address is the same after relocation so why
* generate the extra instruction?
*/
if (mips_opts.arch == CPU_R4650)
{
as_bad (_("opcode not supported on this processor"));
return;
}
/* Itbl support may require additional care here. */
coproc = 1;
if (mips_opts.isa != ISA_MIPS1)
{
s = "ldc1";
goto ld;
}
s = "lwc1";
fmt = "T,o(b)";
goto ldd_std;
case M_S_DAB:
if (mips_opts.arch == CPU_R4650)
{
as_bad (_("opcode not supported on this processor"));
return;
}
if (mips_opts.isa != ISA_MIPS1)
{
s = "sdc1";
goto st;
}
s = "swc1";
fmt = "T,o(b)";
/* Itbl support may require additional care here. */
coproc = 1;
goto ldd_std;
case M_LD_AB:
if (HAVE_64BIT_GPRS)
{
s = "ld";
goto ld;
}
s = "lw";
fmt = "t,o(b)";
goto ldd_std;
case M_SD_AB:
if (HAVE_64BIT_GPRS)
{
s = "sd";
goto st;
}
s = "sw";
fmt = "t,o(b)";
ldd_std:
if (offset_expr.X_op != O_symbol
&& offset_expr.X_op != O_constant)
{
as_bad (_("expression too complex"));
offset_expr.X_op = O_constant;
}
/* Even on a big endian machine $fn comes before $fn+1. We have
to adjust when loading from memory. We set coproc if we must
load $fn+1 first. */
/* Itbl support may require additional care here. */
if (! target_big_endian)
coproc = 0;
if (mips_pic == NO_PIC
|| offset_expr.X_op == O_constant)
{
/* If this is a reference to a GP relative symbol, we want
<op> $treg,<sym>($gp) (BFD_RELOC_GPREL16)
<op> $treg+1,<sym>+4($gp) (BFD_RELOC_GPREL16)
If we have a base register, we use this
addu $at,$breg,$gp
<op> $treg,<sym>($at) (BFD_RELOC_GPREL16)
<op> $treg+1,<sym>+4($at) (BFD_RELOC_GPREL16)
If this is not a GP relative symbol, we want
lui $at,<sym> (BFD_RELOC_HI16_S)
<op> $treg,<sym>($at) (BFD_RELOC_LO16)
<op> $treg+1,<sym>+4($at) (BFD_RELOC_LO16)
If there is a base register, we add it to $at after the
lui instruction. If there is a constant, we always use
the last case. */
if ((valueT) offset_expr.X_add_number > MAX_GPREL_OFFSET
|| nopic_need_relax (offset_expr.X_add_symbol, 1))
used_at = 1;
else
{
relax_start (offset_expr.X_add_symbol);
if (breg == 0)
{
tempreg = mips_gp_register;
used_at = 0;
}
else
{
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t",
AT, breg, mips_gp_register);
tempreg = AT;
used_at = 1;
}
/* Itbl support may require additional care here. */
macro_build (&offset_expr, s, fmt, coproc ? treg + 1 : treg,
BFD_RELOC_GPREL16, tempreg);
offset_expr.X_add_number += 4;
/* Set mips_optimize to 2 to avoid inserting an
undesired nop. */
hold_mips_optimize = mips_optimize;
mips_optimize = 2;
/* Itbl support may require additional care here. */
macro_build (&offset_expr, s, fmt, coproc ? treg : treg + 1,
BFD_RELOC_GPREL16, tempreg);
mips_optimize = hold_mips_optimize;
relax_switch ();
/* We just generated two relocs. When tc_gen_reloc
handles this case, it will skip the first reloc and
handle the second. The second reloc already has an
extra addend of 4, which we added above. We must
subtract it out, and then subtract another 4 to make
the first reloc come out right. The second reloc
will come out right because we are going to add 4 to
offset_expr when we build its instruction below.
If we have a symbol, then we don't want to include
the offset, because it will wind up being included
when we generate the reloc. */
if (offset_expr.X_op == O_constant)
offset_expr.X_add_number -= 8;
else
{
offset_expr.X_add_number = -4;
offset_expr.X_op = O_constant;
}
}
macro_build_lui (&offset_expr, AT);
if (breg != 0)
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", AT, breg, AT);
/* Itbl support may require additional care here. */
macro_build (&offset_expr, s, fmt, coproc ? treg + 1 : treg,
BFD_RELOC_LO16, AT);
/* FIXME: How do we handle overflow here? */
offset_expr.X_add_number += 4;
/* Itbl support may require additional care here. */
macro_build (&offset_expr, s, fmt, coproc ? treg : treg + 1,
BFD_RELOC_LO16, AT);
if (mips_relax.sequence)
relax_end ();
}
else if (mips_pic == SVR4_PIC && ! mips_big_got)
{
/* If this is a reference to an external symbol, we want
lw $at,<sym>($gp) (BFD_RELOC_MIPS_GOT16)
nop
<op> $treg,0($at)
<op> $treg+1,4($at)
Otherwise we want
lw $at,<sym>($gp) (BFD_RELOC_MIPS_GOT16)
nop
<op> $treg,<sym>($at) (BFD_RELOC_LO16)
<op> $treg+1,<sym>+4($at) (BFD_RELOC_LO16)
If there is a base register we add it to $at before the
lwc1 instructions. If there is a constant we include it
in the lwc1 instructions. */
used_at = 1;
expr1.X_add_number = offset_expr.X_add_number;
if (expr1.X_add_number < -0x8000
|| expr1.X_add_number >= 0x8000 - 4)
as_bad (_("PIC code offset overflow (max 16 signed bits)"));
load_got_offset (AT, &offset_expr);
load_delay_nop ();
if (breg != 0)
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", AT, breg, AT);
/* Set mips_optimize to 2 to avoid inserting an undesired
nop. */
hold_mips_optimize = mips_optimize;
mips_optimize = 2;
/* Itbl support may require additional care here. */
relax_start (offset_expr.X_add_symbol);
macro_build (&expr1, s, fmt, coproc ? treg + 1 : treg,
BFD_RELOC_LO16, AT);
expr1.X_add_number += 4;
macro_build (&expr1, s, fmt, coproc ? treg : treg + 1,
BFD_RELOC_LO16, AT);
relax_switch ();
macro_build (&offset_expr, s, fmt, coproc ? treg + 1 : treg,
BFD_RELOC_LO16, AT);
offset_expr.X_add_number += 4;
macro_build (&offset_expr, s, fmt, coproc ? treg : treg + 1,
BFD_RELOC_LO16, AT);
relax_end ();
mips_optimize = hold_mips_optimize;
}
else if (mips_pic == SVR4_PIC)
{
int gpdelay;
/* If this is a reference to an external symbol, we want
lui $at,<sym> (BFD_RELOC_MIPS_GOT_HI16)
addu $at,$at,$gp
lw $at,<sym>($at) (BFD_RELOC_MIPS_GOT_LO16)
nop
<op> $treg,0($at)
<op> $treg+1,4($at)
Otherwise we want
lw $at,<sym>($gp) (BFD_RELOC_MIPS_GOT16)
nop
<op> $treg,<sym>($at) (BFD_RELOC_LO16)
<op> $treg+1,<sym>+4($at) (BFD_RELOC_LO16)
If there is a base register we add it to $at before the
lwc1 instructions. If there is a constant we include it
in the lwc1 instructions. */
used_at = 1;
expr1.X_add_number = offset_expr.X_add_number;
offset_expr.X_add_number = 0;
if (expr1.X_add_number < -0x8000
|| expr1.X_add_number >= 0x8000 - 4)
as_bad (_("PIC code offset overflow (max 16 signed bits)"));
gpdelay = reg_needs_delay (mips_gp_register);
relax_start (offset_expr.X_add_symbol);
macro_build (&offset_expr, "lui", "t,u",
AT, BFD_RELOC_MIPS_GOT_HI16);
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t",
AT, AT, mips_gp_register);
macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)",
AT, BFD_RELOC_MIPS_GOT_LO16, AT);
load_delay_nop ();
if (breg != 0)
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", AT, breg, AT);
/* Itbl support may require additional care here. */
macro_build (&expr1, s, fmt, coproc ? treg + 1 : treg,
BFD_RELOC_LO16, AT);
expr1.X_add_number += 4;
/* Set mips_optimize to 2 to avoid inserting an undesired
nop. */
hold_mips_optimize = mips_optimize;
mips_optimize = 2;
/* Itbl support may require additional care here. */
macro_build (&expr1, s, fmt, coproc ? treg : treg + 1,
BFD_RELOC_LO16, AT);
mips_optimize = hold_mips_optimize;
expr1.X_add_number -= 4;
relax_switch ();
offset_expr.X_add_number = expr1.X_add_number;
if (gpdelay)
macro_build (NULL, "nop", "");
macro_build (&offset_expr, ADDRESS_LOAD_INSN, "t,o(b)", AT,
BFD_RELOC_MIPS_GOT16, mips_gp_register);
load_delay_nop ();
if (breg != 0)
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", AT, breg, AT);
/* Itbl support may require additional care here. */
macro_build (&offset_expr, s, fmt, coproc ? treg + 1 : treg,
BFD_RELOC_LO16, AT);
offset_expr.X_add_number += 4;
/* Set mips_optimize to 2 to avoid inserting an undesired
nop. */
hold_mips_optimize = mips_optimize;
mips_optimize = 2;
/* Itbl support may require additional care here. */
macro_build (&offset_expr, s, fmt, coproc ? treg : treg + 1,
BFD_RELOC_LO16, AT);
mips_optimize = hold_mips_optimize;
relax_end ();
}
else
abort ();
if (! used_at)
return;
break;
case M_LD_OB:
s = "lw";
goto sd_ob;
case M_SD_OB:
s = "sw";
sd_ob:
assert (HAVE_32BIT_ADDRESSES);
macro_build (&offset_expr, s, "t,o(b)", treg, BFD_RELOC_LO16, breg);
offset_expr.X_add_number += 4;
macro_build (&offset_expr, s, "t,o(b)", treg + 1, BFD_RELOC_LO16, breg);
return;
/* New code added to support COPZ instructions.
This code builds table entries out of the macros in mip_opcodes.
R4000 uses interlocks to handle coproc delays.
Other chips (like the R3000) require nops to be inserted for delays.
FIXME: Currently, we require that the user handle delays.
In order to fill delay slots for non-interlocked chips,
we must have a way to specify delays based on the coprocessor.
Eg. 4 cycles if load coproc reg from memory, 1 if in cache, etc.
What are the side-effects of the cop instruction?
What cache support might we have and what are its effects?
Both coprocessor & memory require delays. how long???
What registers are read/set/modified?
If an itbl is provided to interpret cop instructions,
this knowledge can be encoded in the itbl spec. */
case M_COP0:
s = "c0";
goto copz;
case M_COP1:
s = "c1";
goto copz;
case M_COP2:
s = "c2";
goto copz;
case M_COP3:
s = "c3";
copz:
/* For now we just do C (same as Cz). The parameter will be
stored in insn_opcode by mips_ip. */
macro_build (NULL, s, "C", ip->insn_opcode);
return;
case M_MOVE:
move_register (dreg, sreg);
return;
#ifdef LOSING_COMPILER
default:
/* Try and see if this is a new itbl instruction.
This code builds table entries out of the macros in mip_opcodes.
FIXME: For now we just assemble the expression and pass it's
value along as a 32-bit immediate.
We may want to have the assembler assemble this value,
so that we gain the assembler's knowledge of delay slots,
symbols, etc.
Would it be more efficient to use mask (id) here? */
if (itbl_have_entries
&& (immed_expr = itbl_assemble (ip->insn_mo->name, "")))
{
s = ip->insn_mo->name;
s2 = "cop3";
coproc = ITBL_DECODE_PNUM (immed_expr);;
macro_build (&immed_expr, s, "C");
return;
}
macro2 (ip);
return;
}
if (mips_opts.noat)
as_warn (_("Macro used $at after \".set noat\""));
}
static void
macro2 (struct mips_cl_insn *ip)
{
register int treg, sreg, dreg, breg;
int tempreg;
int mask;
int used_at;
expressionS expr1;
const char *s;
const char *s2;
const char *fmt;
int likely = 0;
int dbl = 0;
int coproc = 0;
int lr = 0;
int imm = 0;
int off;
offsetT maxnum;
bfd_reloc_code_real_type r;
treg = (ip->insn_opcode >> 16) & 0x1f;
dreg = (ip->insn_opcode >> 11) & 0x1f;
sreg = breg = (ip->insn_opcode >> 21) & 0x1f;
mask = ip->insn_mo->mask;
expr1.X_op = O_constant;
expr1.X_op_symbol = NULL;
expr1.X_add_symbol = NULL;
expr1.X_add_number = 1;
switch (mask)
{
#endif /* LOSING_COMPILER */
case M_DMUL:
dbl = 1;
case M_MUL:
macro_build (NULL, dbl ? "dmultu" : "multu", "s,t", sreg, treg);
macro_build (NULL, "mflo", "d", dreg);
return;
case M_DMUL_I:
dbl = 1;
case M_MUL_I:
/* The MIPS assembler some times generates shifts and adds. I'm
not trying to be that fancy. GCC should do this for us
anyway. */
load_register (AT, &imm_expr, dbl);
macro_build (NULL, dbl ? "dmult" : "mult", "s,t", sreg, AT);
macro_build (NULL, "mflo", "d", dreg);
break;
case M_DMULO_I:
dbl = 1;
case M_MULO_I:
imm = 1;
goto do_mulo;
case M_DMULO:
dbl = 1;
case M_MULO:
do_mulo:
mips_emit_delays (TRUE);
++mips_opts.noreorder;
mips_any_noreorder = 1;
if (imm)
load_register (AT, &imm_expr, dbl);
macro_build (NULL, dbl ? "dmult" : "mult", "s,t", sreg, imm ? AT : treg);
macro_build (NULL, "mflo", "d", dreg);
macro_build (NULL, dbl ? "dsra32" : "sra", "d,w,<", dreg, dreg, RA);
macro_build (NULL, "mfhi", "d", AT);
if (mips_trap)
macro_build (NULL, "tne", "s,t,q", dreg, AT, 6);
else
{
expr1.X_add_number = 8;
macro_build (&expr1, "beq", "s,t,p", dreg, AT);
macro_build (NULL, "nop", "", 0);
macro_build (NULL, "break", "c", 6);
}
--mips_opts.noreorder;
macro_build (NULL, "mflo", "d", dreg);
break;
case M_DMULOU_I:
dbl = 1;
case M_MULOU_I:
imm = 1;
goto do_mulou;
case M_DMULOU:
dbl = 1;
case M_MULOU:
do_mulou:
mips_emit_delays (TRUE);
++mips_opts.noreorder;
mips_any_noreorder = 1;
if (imm)
load_register (AT, &imm_expr, dbl);
macro_build (NULL, dbl ? "dmultu" : "multu", "s,t",
sreg, imm ? AT : treg);
macro_build (NULL, "mfhi", "d", AT);
macro_build (NULL, "mflo", "d", dreg);
if (mips_trap)
macro_build (NULL, "tne", "s,t,q", AT, 0, 6);
else
{
expr1.X_add_number = 8;
macro_build (&expr1, "beq", "s,t,p", AT, 0);
macro_build (NULL, "nop", "", 0);
macro_build (NULL, "break", "c", 6);
}
--mips_opts.noreorder;
break;
case M_DROL:
if (ISA_HAS_DROR (mips_opts.isa) || CPU_HAS_DROR (mips_opts.arch))
{
if (dreg == sreg)
{
tempreg = AT;
used_at = 1;
}
else
{
tempreg = dreg;
used_at = 0;
}
macro_build (NULL, "dnegu", "d,w", tempreg, treg);
macro_build (NULL, "drorv", "d,t,s", dreg, sreg, tempreg);
if (used_at)
break;
return;
}
macro_build (NULL, "dsubu", "d,v,t", AT, 0, treg);
macro_build (NULL, "dsrlv", "d,t,s", AT, sreg, AT);
macro_build (NULL, "dsllv", "d,t,s", dreg, sreg, treg);
macro_build (NULL, "or", "d,v,t", dreg, dreg, AT);
break;
case M_ROL:
if (ISA_HAS_ROR (mips_opts.isa) || CPU_HAS_ROR (mips_opts.arch))
{
if (dreg == sreg)
{
tempreg = AT;
used_at = 1;
}
else
{
tempreg = dreg;
used_at = 0;
}
macro_build (NULL, "negu", "d,w", tempreg, treg);
macro_build (NULL, "rorv", "d,t,s", dreg, sreg, tempreg);
if (used_at)
break;
return;
}
macro_build (NULL, "subu", "d,v,t", AT, 0, treg);
macro_build (NULL, "srlv", "d,t,s", AT, sreg, AT);
macro_build (NULL, "sllv", "d,t,s", dreg, sreg, treg);
macro_build (NULL, "or", "d,v,t", dreg, dreg, AT);
break;
case M_DROL_I:
{
unsigned int rot;
char *l, *r;
if (imm_expr.X_op != O_constant)
as_bad (_("Improper rotate count"));
rot = imm_expr.X_add_number & 0x3f;
if (ISA_HAS_DROR (mips_opts.isa) || CPU_HAS_DROR (mips_opts.arch))
{
rot = (64 - rot) & 0x3f;
if (rot >= 32)
macro_build (NULL, "dror32", "d,w,<", dreg, sreg, rot - 32);
else
macro_build (NULL, "dror", "d,w,<", dreg, sreg, rot);
return;
}
if (rot == 0)
{
macro_build (NULL, "dsrl", "d,w,<", dreg, sreg, 0);
return;
}
l = (rot < 0x20) ? "dsll" : "dsll32";
r = ((0x40 - rot) < 0x20) ? "dsrl" : "dsrl32";
rot &= 0x1f;
macro_build (NULL, l, "d,w,<", AT, sreg, rot);
macro_build (NULL, r, "d,w,<", dreg, sreg, (0x20 - rot) & 0x1f);
macro_build (NULL, "or", "d,v,t", dreg, dreg, AT);
}
break;
case M_ROL_I:
{
unsigned int rot;
if (imm_expr.X_op != O_constant)
as_bad (_("Improper rotate count"));
rot = imm_expr.X_add_number & 0x1f;
if (ISA_HAS_ROR (mips_opts.isa) || CPU_HAS_ROR (mips_opts.arch))
{
macro_build (NULL, "ror", "d,w,<", dreg, sreg, (32 - rot) & 0x1f);
return;
}
if (rot == 0)
{
macro_build (NULL, "srl", "d,w,<", dreg, sreg, 0);
return;
}
macro_build (NULL, "sll", "d,w,<", AT, sreg, rot);
macro_build (NULL, "srl", "d,w,<", dreg, sreg, (0x20 - rot) & 0x1f);
macro_build (NULL, "or", "d,v,t", dreg, dreg, AT);
}
break;
case M_DROR:
if (ISA_HAS_DROR (mips_opts.isa) || CPU_HAS_DROR (mips_opts.arch))
{
macro_build (NULL, "drorv", "d,t,s", dreg, sreg, treg);
return;
}
macro_build (NULL, "dsubu", "d,v,t", AT, 0, treg);
macro_build (NULL, "dsllv", "d,t,s", AT, sreg, AT);
macro_build (NULL, "dsrlv", "d,t,s", dreg, sreg, treg);
macro_build (NULL, "or", "d,v,t", dreg, dreg, AT);
break;
case M_ROR:
if (ISA_HAS_ROR (mips_opts.isa) || CPU_HAS_ROR (mips_opts.arch))
{
macro_build (NULL, "rorv", "d,t,s", dreg, sreg, treg);
return;
}
macro_build (NULL, "subu", "d,v,t", AT, 0, treg);
macro_build (NULL, "sllv", "d,t,s", AT, sreg, AT);
macro_build (NULL, "srlv", "d,t,s", dreg, sreg, treg);
macro_build (NULL, "or", "d,v,t", dreg, dreg, AT);
break;
case M_DROR_I:
{
unsigned int rot;
char *l, *r;
if (imm_expr.X_op != O_constant)
as_bad (_("Improper rotate count"));
rot = imm_expr.X_add_number & 0x3f;
if (ISA_HAS_DROR (mips_opts.isa) || CPU_HAS_DROR (mips_opts.arch))
{
if (rot >= 32)
macro_build (NULL, "dror32", "d,w,<", dreg, sreg, rot - 32);
else
macro_build (NULL, "dror", "d,w,<", dreg, sreg, rot);
return;
}
if (rot == 0)
{
macro_build (NULL, "dsrl", "d,w,<", dreg, sreg, 0);
return;
}
r = (rot < 0x20) ? "dsrl" : "dsrl32";
l = ((0x40 - rot) < 0x20) ? "dsll" : "dsll32";
rot &= 0x1f;
macro_build (NULL, r, "d,w,<", AT, sreg, rot);
macro_build (NULL, l, "d,w,<", dreg, sreg, (0x20 - rot) & 0x1f);
macro_build (NULL, "or", "d,v,t", dreg, dreg, AT);
}
break;
case M_ROR_I:
{
unsigned int rot;
if (imm_expr.X_op != O_constant)
as_bad (_("Improper rotate count"));
rot = imm_expr.X_add_number & 0x1f;
if (ISA_HAS_ROR (mips_opts.isa) || CPU_HAS_ROR (mips_opts.arch))
{
macro_build (NULL, "ror", "d,w,<", dreg, sreg, rot);
return;
}
if (rot == 0)
{
macro_build (NULL, "srl", "d,w,<", dreg, sreg, 0);
return;
}
macro_build (NULL, "srl", "d,w,<", AT, sreg, rot);
macro_build (NULL, "sll", "d,w,<", dreg, sreg, (0x20 - rot) & 0x1f);
macro_build (NULL, "or", "d,v,t", dreg, dreg, AT);
}
break;
case M_S_DOB:
if (mips_opts.arch == CPU_R4650)
{
as_bad (_("opcode not supported on this processor"));
return;
}
assert (mips_opts.isa == ISA_MIPS1);
/* Even on a big endian machine $fn comes before $fn+1. We have
to adjust when storing to memory. */
macro_build (&offset_expr, "swc1", "T,o(b)",
target_big_endian ? treg + 1 : treg, BFD_RELOC_LO16, breg);
offset_expr.X_add_number += 4;
macro_build (&offset_expr, "swc1", "T,o(b)",
target_big_endian ? treg : treg + 1, BFD_RELOC_LO16, breg);
return;
case M_SEQ:
if (sreg == 0)
macro_build (&expr1, "sltiu", "t,r,j", dreg, treg, BFD_RELOC_LO16);
else if (treg == 0)
macro_build (&expr1, "sltiu", "t,r,j", dreg, sreg, BFD_RELOC_LO16);
else
{
macro_build (NULL, "xor", "d,v,t", dreg, sreg, treg);
macro_build (&expr1, "sltiu", "t,r,j", dreg, dreg, BFD_RELOC_LO16);
}
return;
case M_SEQ_I:
if (imm_expr.X_op == O_constant && imm_expr.X_add_number == 0)
{
macro_build (&expr1, "sltiu", "t,r,j", dreg, sreg, BFD_RELOC_LO16);
return;
}
if (sreg == 0)
{
as_warn (_("Instruction %s: result is always false"),
ip->insn_mo->name);
move_register (dreg, 0);
return;
}
if (imm_expr.X_op == O_constant
&& imm_expr.X_add_number >= 0
&& imm_expr.X_add_number < 0x10000)
{
macro_build (&imm_expr, "xori", "t,r,i", dreg, sreg, BFD_RELOC_LO16);
used_at = 0;
}
else if (imm_expr.X_op == O_constant
&& imm_expr.X_add_number > -0x8000
&& imm_expr.X_add_number < 0)
{
imm_expr.X_add_number = -imm_expr.X_add_number;
macro_build (&imm_expr, HAVE_32BIT_GPRS ? "addiu" : "daddiu",
"t,r,j", dreg, sreg, BFD_RELOC_LO16);
used_at = 0;
}
else
{
load_register (AT, &imm_expr, HAVE_64BIT_GPRS);
macro_build (NULL, "xor", "d,v,t", dreg, sreg, AT);
used_at = 1;
}
macro_build (&expr1, "sltiu", "t,r,j", dreg, dreg, BFD_RELOC_LO16);
if (used_at)
break;
return;
case M_SGE: /* sreg >= treg <==> not (sreg < treg) */
s = "slt";
goto sge;
case M_SGEU:
s = "sltu";
sge:
macro_build (NULL, s, "d,v,t", dreg, sreg, treg);
macro_build (&expr1, "xori", "t,r,i", dreg, dreg, BFD_RELOC_LO16);
return;
case M_SGE_I: /* sreg >= I <==> not (sreg < I) */
case M_SGEU_I:
if (imm_expr.X_op == O_constant
&& imm_expr.X_add_number >= -0x8000
&& imm_expr.X_add_number < 0x8000)
{
macro_build (&imm_expr, mask == M_SGE_I ? "slti" : "sltiu", "t,r,j",
dreg, sreg, BFD_RELOC_LO16);
used_at = 0;
}
else
{
load_register (AT, &imm_expr, HAVE_64BIT_GPRS);
macro_build (NULL, mask == M_SGE_I ? "slt" : "sltu", "d,v,t",
dreg, sreg, AT);
used_at = 1;
}
macro_build (&expr1, "xori", "t,r,i", dreg, dreg, BFD_RELOC_LO16);
if (used_at)
break;
return;
case M_SGT: /* sreg > treg <==> treg < sreg */
s = "slt";
goto sgt;
case M_SGTU:
s = "sltu";
sgt:
macro_build (NULL, s, "d,v,t", dreg, treg, sreg);
return;
case M_SGT_I: /* sreg > I <==> I < sreg */
s = "slt";
goto sgti;
case M_SGTU_I:
s = "sltu";
sgti:
load_register (AT, &imm_expr, HAVE_64BIT_GPRS);
macro_build (NULL, s, "d,v,t", dreg, AT, sreg);
break;
case M_SLE: /* sreg <= treg <==> treg >= sreg <==> not (treg < sreg) */
s = "slt";
goto sle;
case M_SLEU:
s = "sltu";
sle:
macro_build (NULL, s, "d,v,t", dreg, treg, sreg);
macro_build (&expr1, "xori", "t,r,i", dreg, dreg, BFD_RELOC_LO16);
return;
case M_SLE_I: /* sreg <= I <==> I >= sreg <==> not (I < sreg) */
s = "slt";
goto slei;
case M_SLEU_I:
s = "sltu";
slei:
load_register (AT, &imm_expr, HAVE_64BIT_GPRS);
macro_build (NULL, s, "d,v,t", dreg, AT, sreg);
macro_build (&expr1, "xori", "t,r,i", dreg, dreg, BFD_RELOC_LO16);
break;
case M_SLT_I:
if (imm_expr.X_op == O_constant
&& imm_expr.X_add_number >= -0x8000
&& imm_expr.X_add_number < 0x8000)
{
macro_build (&imm_expr, "slti", "t,r,j", dreg, sreg, BFD_RELOC_LO16);
return;
}
load_register (AT, &imm_expr, HAVE_64BIT_GPRS);
macro_build (NULL, "slt", "d,v,t", dreg, sreg, AT);
break;
case M_SLTU_I:
if (imm_expr.X_op == O_constant
&& imm_expr.X_add_number >= -0x8000
&& imm_expr.X_add_number < 0x8000)
{
macro_build (&imm_expr, "sltiu", "t,r,j", dreg, sreg,
BFD_RELOC_LO16);
return;
}
load_register (AT, &imm_expr, HAVE_64BIT_GPRS);
macro_build (NULL, "sltu", "d,v,t", dreg, sreg, AT);
break;
case M_SNE:
if (sreg == 0)
macro_build (NULL, "sltu", "d,v,t", dreg, 0, treg);
else if (treg == 0)
macro_build (NULL, "sltu", "d,v,t", dreg, 0, sreg);
else
{
macro_build (NULL, "xor", "d,v,t", dreg, sreg, treg);
macro_build (NULL, "sltu", "d,v,t", dreg, 0, dreg);
}
return;
case M_SNE_I:
if (imm_expr.X_op == O_constant && imm_expr.X_add_number == 0)
{
macro_build (NULL, "sltu", "d,v,t", dreg, 0, sreg);
return;
}
if (sreg == 0)
{
as_warn (_("Instruction %s: result is always true"),
ip->insn_mo->name);
macro_build (&expr1, HAVE_32BIT_GPRS ? "addiu" : "daddiu", "t,r,j",
dreg, 0, BFD_RELOC_LO16);
return;
}
if (imm_expr.X_op == O_constant
&& imm_expr.X_add_number >= 0
&& imm_expr.X_add_number < 0x10000)
{
macro_build (&imm_expr, "xori", "t,r,i", dreg, sreg, BFD_RELOC_LO16);
used_at = 0;
}
else if (imm_expr.X_op == O_constant
&& imm_expr.X_add_number > -0x8000
&& imm_expr.X_add_number < 0)
{
imm_expr.X_add_number = -imm_expr.X_add_number;
macro_build (&imm_expr, HAVE_32BIT_GPRS ? "addiu" : "daddiu",
"t,r,j", dreg, sreg, BFD_RELOC_LO16);
used_at = 0;
}
else
{
load_register (AT, &imm_expr, HAVE_64BIT_GPRS);
macro_build (NULL, "xor", "d,v,t", dreg, sreg, AT);
used_at = 1;
}
macro_build (NULL, "sltu", "d,v,t", dreg, 0, dreg);
if (used_at)
break;
return;
case M_DSUB_I:
dbl = 1;
case M_SUB_I:
if (imm_expr.X_op == O_constant
&& imm_expr.X_add_number > -0x8000
&& imm_expr.X_add_number <= 0x8000)
{
imm_expr.X_add_number = -imm_expr.X_add_number;
macro_build (&imm_expr, dbl ? "daddi" : "addi", "t,r,j",
dreg, sreg, BFD_RELOC_LO16);
return;
}
load_register (AT, &imm_expr, dbl);
macro_build (NULL, dbl ? "dsub" : "sub", "d,v,t", dreg, sreg, AT);
break;
case M_DSUBU_I:
dbl = 1;
case M_SUBU_I:
if (imm_expr.X_op == O_constant
&& imm_expr.X_add_number > -0x8000
&& imm_expr.X_add_number <= 0x8000)
{
imm_expr.X_add_number = -imm_expr.X_add_number;
macro_build (&imm_expr, dbl ? "daddiu" : "addiu", "t,r,j",
dreg, sreg, BFD_RELOC_LO16);
return;
}
load_register (AT, &imm_expr, dbl);
macro_build (NULL, dbl ? "dsubu" : "subu", "d,v,t", dreg, sreg, AT);
break;
case M_TEQ_I:
s = "teq";
goto trap;
case M_TGE_I:
s = "tge";
goto trap;
case M_TGEU_I:
s = "tgeu";
goto trap;
case M_TLT_I:
s = "tlt";
goto trap;
case M_TLTU_I:
s = "tltu";
goto trap;
case M_TNE_I:
s = "tne";
trap:
load_register (AT, &imm_expr, HAVE_64BIT_GPRS);
macro_build (NULL, s, "s,t", sreg, AT);
break;
case M_TRUNCWS:
case M_TRUNCWD:
assert (mips_opts.isa == ISA_MIPS1);
sreg = (ip->insn_opcode >> 11) & 0x1f; /* floating reg */
dreg = (ip->insn_opcode >> 06) & 0x1f; /* floating reg */
/*
* Is the double cfc1 instruction a bug in the mips assembler;
* or is there a reason for it?
*/
mips_emit_delays (TRUE);
++mips_opts.noreorder;
mips_any_noreorder = 1;
macro_build (NULL, "cfc1", "t,G", treg, RA);
macro_build (NULL, "cfc1", "t,G", treg, RA);
macro_build (NULL, "nop", "");
expr1.X_add_number = 3;
macro_build (&expr1, "ori", "t,r,i", AT, treg, BFD_RELOC_LO16);
expr1.X_add_number = 2;
macro_build (&expr1, "xori", "t,r,i", AT, AT, BFD_RELOC_LO16);
macro_build (NULL, "ctc1", "t,G", AT, RA);
macro_build (NULL, "nop", "");
macro_build (NULL, mask == M_TRUNCWD ? "cvt.w.d" : "cvt.w.s", "D,S",
dreg, sreg);
macro_build (NULL, "ctc1", "t,G", treg, RA);
macro_build (NULL, "nop", "");
--mips_opts.noreorder;
break;
case M_ULH:
s = "lb";
goto ulh;
case M_ULHU:
s = "lbu";
ulh:
if (offset_expr.X_add_number >= 0x7fff)
as_bad (_("operand overflow"));
if (! target_big_endian)
++offset_expr.X_add_number;
macro_build (&offset_expr, s, "t,o(b)", AT, BFD_RELOC_LO16, breg);
if (! target_big_endian)
--offset_expr.X_add_number;
else
++offset_expr.X_add_number;
macro_build (&offset_expr, "lbu", "t,o(b)", treg, BFD_RELOC_LO16, breg);
macro_build (NULL, "sll", "d,w,<", AT, AT, 8);
macro_build (NULL, "or", "d,v,t", treg, treg, AT);
break;
case M_ULD:
s = "ldl";
s2 = "ldr";
off = 7;
goto ulw;
case M_ULW:
s = "lwl";
s2 = "lwr";
off = 3;
ulw:
if (offset_expr.X_add_number >= 0x8000 - off)
as_bad (_("operand overflow"));
if (treg != breg)
tempreg = treg;
else
tempreg = AT;
if (! target_big_endian)
offset_expr.X_add_number += off;
macro_build (&offset_expr, s, "t,o(b)", tempreg, BFD_RELOC_LO16, breg);
if (! target_big_endian)
offset_expr.X_add_number -= off;
else
offset_expr.X_add_number += off;
macro_build (&offset_expr, s2, "t,o(b)", tempreg, BFD_RELOC_LO16, breg);
/* If necessary, move the result in tempreg the final destination. */
if (treg == tempreg)
return;
/* Protect second load's delay slot. */
load_delay_nop ();
move_register (treg, tempreg);
break;
case M_ULD_A:
s = "ldl";
s2 = "ldr";
off = 7;
goto ulwa;
case M_ULW_A:
s = "lwl";
s2 = "lwr";
off = 3;
ulwa:
used_at = 1;
load_address (AT, &offset_expr, &used_at);
if (breg != 0)
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", AT, AT, breg);
if (! target_big_endian)
expr1.X_add_number = off;
else
expr1.X_add_number = 0;
macro_build (&expr1, s, "t,o(b)", treg, BFD_RELOC_LO16, AT);
if (! target_big_endian)
expr1.X_add_number = 0;
else
expr1.X_add_number = off;
macro_build (&expr1, s2, "t,o(b)", treg, BFD_RELOC_LO16, AT);
break;
case M_ULH_A:
case M_ULHU_A:
used_at = 1;
load_address (AT, &offset_expr, &used_at);
if (breg != 0)
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", AT, AT, breg);
if (target_big_endian)
expr1.X_add_number = 0;
macro_build (&expr1, mask == M_ULH_A ? "lb" : "lbu", "t,o(b)",
treg, BFD_RELOC_LO16, AT);
if (target_big_endian)
expr1.X_add_number = 1;
else
expr1.X_add_number = 0;
macro_build (&expr1, "lbu", "t,o(b)", AT, BFD_RELOC_LO16, AT);
macro_build (NULL, "sll", "d,w,<", treg, treg, 8);
macro_build (NULL, "or", "d,v,t", treg, treg, AT);
break;
case M_USH:
if (offset_expr.X_add_number >= 0x7fff)
as_bad (_("operand overflow"));
if (target_big_endian)
++offset_expr.X_add_number;
macro_build (&offset_expr, "sb", "t,o(b)", treg, BFD_RELOC_LO16, breg);
macro_build (NULL, "srl", "d,w,<", AT, treg, 8);
if (target_big_endian)
--offset_expr.X_add_number;
else
++offset_expr.X_add_number;
macro_build (&offset_expr, "sb", "t,o(b)", AT, BFD_RELOC_LO16, breg);
break;
case M_USD:
s = "sdl";
s2 = "sdr";
off = 7;
goto usw;
case M_USW:
s = "swl";
s2 = "swr";
off = 3;
usw:
if (offset_expr.X_add_number >= 0x8000 - off)
as_bad (_("operand overflow"));
if (! target_big_endian)
offset_expr.X_add_number += off;
macro_build (&offset_expr, s, "t,o(b)", treg, BFD_RELOC_LO16, breg);
if (! target_big_endian)
offset_expr.X_add_number -= off;
else
offset_expr.X_add_number += off;
macro_build (&offset_expr, s2, "t,o(b)", treg, BFD_RELOC_LO16, breg);
return;
case M_USD_A:
s = "sdl";
s2 = "sdr";
off = 7;
goto uswa;
case M_USW_A:
s = "swl";
s2 = "swr";
off = 3;
uswa:
used_at = 1;
load_address (AT, &offset_expr, &used_at);
if (breg != 0)
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", AT, AT, breg);
if (! target_big_endian)
expr1.X_add_number = off;
else
expr1.X_add_number = 0;
macro_build (&expr1, s, "t,o(b)", treg, BFD_RELOC_LO16, AT);
if (! target_big_endian)
expr1.X_add_number = 0;
else
expr1.X_add_number = off;
macro_build (&expr1, s2, "t,o(b)", treg, BFD_RELOC_LO16, AT);
break;
case M_USH_A:
used_at = 1;
load_address (AT, &offset_expr, &used_at);
if (breg != 0)
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", AT, AT, breg);
if (! target_big_endian)
expr1.X_add_number = 0;
macro_build (&expr1, "sb", "t,o(b)", treg, BFD_RELOC_LO16, AT);
macro_build (NULL, "srl", "d,w,<", treg, treg, 8);
if (! target_big_endian)
expr1.X_add_number = 1;
else
expr1.X_add_number = 0;
macro_build (&expr1, "sb", "t,o(b)", treg, BFD_RELOC_LO16, AT);
if (! target_big_endian)
expr1.X_add_number = 0;
else
expr1.X_add_number = 1;
macro_build (&expr1, "lbu", "t,o(b)", AT, BFD_RELOC_LO16, AT);
macro_build (NULL, "sll", "d,w,<", treg, treg, 8);
macro_build (NULL, "or", "d,v,t", treg, treg, AT);
break;
default:
/* FIXME: Check if this is one of the itbl macros, since they
are added dynamically. */
as_bad (_("Macro %s not implemented yet"), ip->insn_mo->name);
break;
}
if (mips_opts.noat)
as_warn (_("Macro used $at after \".set noat\""));
}
/* Implement macros in mips16 mode. */
static void
mips16_macro (struct mips_cl_insn *ip)
{
int mask;
int xreg, yreg, zreg, tmp;
expressionS expr1;
int dbl;
const char *s, *s2, *s3;
mask = ip->insn_mo->mask;
xreg = (ip->insn_opcode >> MIPS16OP_SH_RX) & MIPS16OP_MASK_RX;
yreg = (ip->insn_opcode >> MIPS16OP_SH_RY) & MIPS16OP_MASK_RY;
zreg = (ip->insn_opcode >> MIPS16OP_SH_RZ) & MIPS16OP_MASK_RZ;
expr1.X_op = O_constant;
expr1.X_op_symbol = NULL;
expr1.X_add_symbol = NULL;
expr1.X_add_number = 1;
dbl = 0;
switch (mask)
{
default:
internalError ();
case M_DDIV_3:
dbl = 1;
case M_DIV_3:
s = "mflo";
goto do_div3;
case M_DREM_3:
dbl = 1;
case M_REM_3:
s = "mfhi";
do_div3:
mips_emit_delays (TRUE);
++mips_opts.noreorder;
mips_any_noreorder = 1;
macro_build (NULL, dbl ? "ddiv" : "div", "0,x,y", xreg, yreg);
expr1.X_add_number = 2;
macro_build (&expr1, "bnez", "x,p", yreg);
macro_build (NULL, "break", "6", 7);
/* FIXME: The normal code checks for of -1 / -0x80000000 here,
since that causes an overflow. We should do that as well,
but I don't see how to do the comparisons without a temporary
register. */
--mips_opts.noreorder;
macro_build (NULL, s, "x", zreg);
break;
case M_DIVU_3:
s = "divu";
s2 = "mflo";
goto do_divu3;
case M_REMU_3:
s = "divu";
s2 = "mfhi";
goto do_divu3;
case M_DDIVU_3:
s = "ddivu";
s2 = "mflo";
goto do_divu3;
case M_DREMU_3:
s = "ddivu";
s2 = "mfhi";
do_divu3:
mips_emit_delays (TRUE);
++mips_opts.noreorder;
mips_any_noreorder = 1;
macro_build (NULL, s, "0,x,y", xreg, yreg);
expr1.X_add_number = 2;
macro_build (&expr1, "bnez", "x,p", yreg);
macro_build (NULL, "break", "6", 7);
--mips_opts.noreorder;
macro_build (NULL, s2, "x", zreg);
break;
case M_DMUL:
dbl = 1;
case M_MUL:
macro_build (NULL, dbl ? "dmultu" : "multu", "x,y", xreg, yreg);
macro_build (NULL, "mflo", "x", zreg);
return;
case M_DSUBU_I:
dbl = 1;
goto do_subu;
case M_SUBU_I:
do_subu:
if (imm_expr.X_op != O_constant)
as_bad (_("Unsupported large constant"));
imm_expr.X_add_number = -imm_expr.X_add_number;
macro_build (&imm_expr, dbl ? "daddiu" : "addiu", "y,x,4", yreg, xreg);
break;
case M_SUBU_I_2:
if (imm_expr.X_op != O_constant)
as_bad (_("Unsupported large constant"));
imm_expr.X_add_number = -imm_expr.X_add_number;
macro_build (&imm_expr, "addiu", "x,k", xreg);
break;
case M_DSUBU_I_2:
if (imm_expr.X_op != O_constant)
as_bad (_("Unsupported large constant"));
imm_expr.X_add_number = -imm_expr.X_add_number;
macro_build (&imm_expr, "daddiu", "y,j", yreg);
break;
case M_BEQ:
s = "cmp";
s2 = "bteqz";
goto do_branch;
case M_BNE:
s = "cmp";
s2 = "btnez";
goto do_branch;
case M_BLT:
s = "slt";
s2 = "btnez";
goto do_branch;
case M_BLTU:
s = "sltu";
s2 = "btnez";
goto do_branch;
case M_BLE:
s = "slt";
s2 = "bteqz";
goto do_reverse_branch;
case M_BLEU:
s = "sltu";
s2 = "bteqz";
goto do_reverse_branch;
case M_BGE:
s = "slt";
s2 = "bteqz";
goto do_branch;
case M_BGEU:
s = "sltu";
s2 = "bteqz";
goto do_branch;
case M_BGT:
s = "slt";
s2 = "btnez";
goto do_reverse_branch;
case M_BGTU:
s = "sltu";
s2 = "btnez";
do_reverse_branch:
tmp = xreg;
xreg = yreg;
yreg = tmp;
do_branch:
macro_build (NULL, s, "x,y", xreg, yreg);
macro_build (&offset_expr, s2, "p");
break;
case M_BEQ_I:
s = "cmpi";
s2 = "bteqz";
s3 = "x,U";
goto do_branch_i;
case M_BNE_I:
s = "cmpi";
s2 = "btnez";
s3 = "x,U";
goto do_branch_i;
case M_BLT_I:
s = "slti";
s2 = "btnez";
s3 = "x,8";
goto do_branch_i;
case M_BLTU_I:
s = "sltiu";
s2 = "btnez";
s3 = "x,8";
goto do_branch_i;
case M_BLE_I:
s = "slti";
s2 = "btnez";
s3 = "x,8";
goto do_addone_branch_i;
case M_BLEU_I:
s = "sltiu";
s2 = "btnez";
s3 = "x,8";
goto do_addone_branch_i;
case M_BGE_I:
s = "slti";
s2 = "bteqz";
s3 = "x,8";
goto do_branch_i;
case M_BGEU_I:
s = "sltiu";
s2 = "bteqz";
s3 = "x,8";
goto do_branch_i;
case M_BGT_I:
s = "slti";
s2 = "bteqz";
s3 = "x,8";
goto do_addone_branch_i;
case M_BGTU_I:
s = "sltiu";
s2 = "bteqz";
s3 = "x,8";
do_addone_branch_i:
if (imm_expr.X_op != O_constant)
as_bad (_("Unsupported large constant"));
++imm_expr.X_add_number;
do_branch_i:
macro_build (&imm_expr, s, s3, xreg);
macro_build (&offset_expr, s2, "p");
break;
case M_ABS:
expr1.X_add_number = 0;
macro_build (&expr1, "slti", "x,8", yreg);
if (xreg != yreg)
move_register (xreg, yreg);
expr1.X_add_number = 2;
macro_build (&expr1, "bteqz", "p");
macro_build (NULL, "neg", "x,w", xreg, xreg);
}
}
/* For consistency checking, verify that all bits are specified either
by the match/mask part of the instruction definition, or by the
operand list. */
static int
validate_mips_insn (const struct mips_opcode *opc)
{
const char *p = opc->args;
char c;
unsigned long used_bits = opc->mask;
if ((used_bits & opc->match) != opc->match)
{
as_bad (_("internal: bad mips opcode (mask error): %s %s"),
opc->name, opc->args);
return 0;
}
#define USE_BITS(mask,shift) (used_bits |= ((mask) << (shift)))
while (*p)
switch (c = *p++)
{
case ',': break;
case '(': break;
case ')': break;
case '+':
switch (c = *p++)
{
case 'A': USE_BITS (OP_MASK_SHAMT, OP_SH_SHAMT); break;
case 'B': USE_BITS (OP_MASK_INSMSB, OP_SH_INSMSB); break;
case 'C': USE_BITS (OP_MASK_EXTMSBD, OP_SH_EXTMSBD); break;
case 'D': USE_BITS (OP_MASK_RD, OP_SH_RD);
USE_BITS (OP_MASK_SEL, OP_SH_SEL); break;
case 'E': USE_BITS (OP_MASK_SHAMT, OP_SH_SHAMT); break;
case 'F': USE_BITS (OP_MASK_INSMSB, OP_SH_INSMSB); break;
case 'G': USE_BITS (OP_MASK_EXTMSBD, OP_SH_EXTMSBD); break;
case 'H': USE_BITS (OP_MASK_EXTMSBD, OP_SH_EXTMSBD); break;
case 'I': break;
default:
as_bad (_("internal: bad mips opcode (unknown extension operand type `+%c'): %s %s"),
c, opc->name, opc->args);
return 0;
}
break;
case '<': USE_BITS (OP_MASK_SHAMT, OP_SH_SHAMT); break;
case '>': USE_BITS (OP_MASK_SHAMT, OP_SH_SHAMT); break;
case 'A': break;
case 'B': USE_BITS (OP_MASK_CODE20, OP_SH_CODE20); break;
case 'C': USE_BITS (OP_MASK_COPZ, OP_SH_COPZ); break;
case 'D': USE_BITS (OP_MASK_FD, OP_SH_FD); break;
case 'E': USE_BITS (OP_MASK_RT, OP_SH_RT); break;
case 'F': break;
case 'G': USE_BITS (OP_MASK_RD, OP_SH_RD); break;
case 'H': USE_BITS (OP_MASK_SEL, OP_SH_SEL); break;
case 'I': break;
case 'J': USE_BITS (OP_MASK_CODE19, OP_SH_CODE19); break;
case 'K': USE_BITS (OP_MASK_RD, OP_SH_RD); break;
case 'L': break;
case 'M': USE_BITS (OP_MASK_CCC, OP_SH_CCC); break;
case 'N': USE_BITS (OP_MASK_BCC, OP_SH_BCC); break;
case 'O': USE_BITS (OP_MASK_ALN, OP_SH_ALN); break;
case 'Q': USE_BITS (OP_MASK_VSEL, OP_SH_VSEL);
USE_BITS (OP_MASK_FT, OP_SH_FT); break;
case 'R': USE_BITS (OP_MASK_FR, OP_SH_FR); break;
case 'S': USE_BITS (OP_MASK_FS, OP_SH_FS); break;
case 'T': USE_BITS (OP_MASK_FT, OP_SH_FT); break;
case 'V': USE_BITS (OP_MASK_FS, OP_SH_FS); break;
case 'W': USE_BITS (OP_MASK_FT, OP_SH_FT); break;
case 'X': USE_BITS (OP_MASK_FD, OP_SH_FD); break;
case 'Y': USE_BITS (OP_MASK_FS, OP_SH_FS); break;
case 'Z': USE_BITS (OP_MASK_FT, OP_SH_FT); break;
case 'a': USE_BITS (OP_MASK_TARGET, OP_SH_TARGET); break;
case 'b': USE_BITS (OP_MASK_RS, OP_SH_RS); break;
case 'c': USE_BITS (OP_MASK_CODE, OP_SH_CODE); break;
case 'd': USE_BITS (OP_MASK_RD, OP_SH_RD); break;
case 'f': break;
case 'h': USE_BITS (OP_MASK_PREFX, OP_SH_PREFX); break;
case 'i': USE_BITS (OP_MASK_IMMEDIATE, OP_SH_IMMEDIATE); break;
case 'j': USE_BITS (OP_MASK_DELTA, OP_SH_DELTA); break;
case 'k': USE_BITS (OP_MASK_CACHE, OP_SH_CACHE); break;
case 'l': break;
case 'o': USE_BITS (OP_MASK_DELTA, OP_SH_DELTA); break;
case 'p': USE_BITS (OP_MASK_DELTA, OP_SH_DELTA); break;
case 'q': USE_BITS (OP_MASK_CODE2, OP_SH_CODE2); break;
case 'r': USE_BITS (OP_MASK_RS, OP_SH_RS); break;
case 's': USE_BITS (OP_MASK_RS, OP_SH_RS); break;
case 't': USE_BITS (OP_MASK_RT, OP_SH_RT); break;
case 'u': USE_BITS (OP_MASK_IMMEDIATE, OP_SH_IMMEDIATE); break;
case 'v': USE_BITS (OP_MASK_RS, OP_SH_RS); break;
case 'w': USE_BITS (OP_MASK_RT, OP_SH_RT); break;
case 'x': break;
case 'z': break;
case 'P': USE_BITS (OP_MASK_PERFREG, OP_SH_PERFREG); break;
case 'U': USE_BITS (OP_MASK_RD, OP_SH_RD);
USE_BITS (OP_MASK_RT, OP_SH_RT); break;
case 'e': USE_BITS (OP_MASK_VECBYTE, OP_SH_VECBYTE); break;
case '%': USE_BITS (OP_MASK_VECALIGN, OP_SH_VECALIGN); break;
case '[': break;
case ']': break;
default:
as_bad (_("internal: bad mips opcode (unknown operand type `%c'): %s %s"),
c, opc->name, opc->args);
return 0;
}
#undef USE_BITS
if (used_bits != 0xffffffff)
{
as_bad (_("internal: bad mips opcode (bits 0x%lx undefined): %s %s"),
~used_bits & 0xffffffff, opc->name, opc->args);
return 0;
}
return 1;
}
/* This routine assembles an instruction into its binary format. As a
side effect, it sets one of the global variables imm_reloc or
offset_reloc to the type of relocation to do if one of the operands
is an address expression. */
static void
mips_ip (char *str, struct mips_cl_insn *ip)
{
char *s;
const char *args;
char c = 0;
struct mips_opcode *insn;
char *argsStart;
unsigned int regno;
unsigned int lastregno = 0;
unsigned int lastpos = 0;
unsigned int limlo, limhi;
char *s_reset;
char save_c = 0;
insn_error = NULL;
/* If the instruction contains a '.', we first try to match an instruction
including the '.'. Then we try again without the '.'. */
insn = NULL;
for (s = str; *s != '\0' && !ISSPACE (*s); ++s)
continue;
/* If we stopped on whitespace, then replace the whitespace with null for
the call to hash_find. Save the character we replaced just in case we
have to re-parse the instruction. */
if (ISSPACE (*s))
{
save_c = *s;
*s++ = '\0';
}
insn = (struct mips_opcode *) hash_find (op_hash, str);
/* If we didn't find the instruction in the opcode table, try again, but
this time with just the instruction up to, but not including the
first '.'. */
if (insn == NULL)
{
/* Restore the character we overwrite above (if any). */
if (save_c)
*(--s) = save_c;
/* Scan up to the first '.' or whitespace. */
for (s = str;
*s != '\0' && *s != '.' && !ISSPACE (*s);
++s)
continue;
/* If we did not find a '.', then we can quit now. */
if (*s != '.')
{
insn_error = "unrecognized opcode";
return;
}
/* Lookup the instruction in the hash table. */
*s++ = '\0';
if ((insn = (struct mips_opcode *) hash_find (op_hash, str)) == NULL)
{
insn_error = "unrecognized opcode";
return;
}
}
argsStart = s;
for (;;)
{
bfd_boolean ok;
assert (strcmp (insn->name, str) == 0);
if (OPCODE_IS_MEMBER (insn,
(mips_opts.isa
| (file_ase_mips16 ? INSN_MIPS16 : 0)
| (mips_opts.ase_mdmx ? INSN_MDMX : 0)
| (mips_opts.ase_mips3d ? INSN_MIPS3D : 0)),
mips_opts.arch))
ok = TRUE;
else
ok = FALSE;
if (insn->pinfo != INSN_MACRO)
{
if (mips_opts.arch == CPU_R4650 && (insn->pinfo & FP_D) != 0)
ok = FALSE;
}
if (! ok)
{
if (insn + 1 < &mips_opcodes[NUMOPCODES]
&& strcmp (insn->name, insn[1].name) == 0)
{
++insn;
continue;
}
else
{
if (!insn_error)
{
static char buf[100];
sprintf (buf,
_("opcode not supported on this processor: %s (%s)"),
mips_cpu_info_from_arch (mips_opts.arch)->name,
mips_cpu_info_from_isa (mips_opts.isa)->name);
insn_error = buf;
}
if (save_c)
*(--s) = save_c;
return;
}
}
ip->insn_mo = insn;
ip->insn_opcode = insn->match;
insn_error = NULL;
for (args = insn->args;; ++args)
{
int is_mdmx;
s += strspn (s, " \t");
is_mdmx = 0;
switch (*args)
{
case '\0': /* end of args */
if (*s == '\0')
return;
break;
case ',':
if (*s++ == *args)
continue;
s--;
switch (*++args)
{
case 'r':
case 'v':
ip->insn_opcode |= lastregno << OP_SH_RS;
continue;
case 'w':
ip->insn_opcode |= lastregno << OP_SH_RT;
continue;
case 'W':
ip->insn_opcode |= lastregno << OP_SH_FT;
continue;
case 'V':
ip->insn_opcode |= lastregno << OP_SH_FS;
continue;
}
break;
case '(':
/* Handle optional base register.
Either the base register is omitted or
we must have a left paren. */
/* This is dependent on the next operand specifier
is a base register specification. */
assert (args[1] == 'b' || args[1] == '5'
|| args[1] == '-' || args[1] == '4');
if (*s == '\0')
return;
case ')': /* these must match exactly */
case '[':
case ']':
if (*s++ == *args)
continue;
break;
case '+': /* Opcode extension character. */
switch (*++args)
{
case 'A': /* ins/ext position, becomes LSB. */
limlo = 0;
limhi = 31;
goto do_lsb;
case 'E':
limlo = 32;
limhi = 63;
goto do_lsb;
do_lsb:
my_getExpression (&imm_expr, s);
check_absolute_expr (ip, &imm_expr);
if ((unsigned long) imm_expr.X_add_number < limlo
|| (unsigned long) imm_expr.X_add_number > limhi)
{
as_bad (_("Improper position (%lu)"),
(unsigned long) imm_expr.X_add_number);
imm_expr.X_add_number = limlo;
}
lastpos = imm_expr.X_add_number;
ip->insn_opcode |= (imm_expr.X_add_number
& OP_MASK_SHAMT) << OP_SH_SHAMT;
imm_expr.X_op = O_absent;
s = expr_end;
continue;
case 'B': /* ins size, becomes MSB. */
limlo = 1;
limhi = 32;
goto do_msb;
case 'F':
limlo = 33;
limhi = 64;
goto do_msb;
do_msb:
my_getExpression (&imm_expr, s);
check_absolute_expr (ip, &imm_expr);
/* Check for negative input so that small negative numbers
will not succeed incorrectly. The checks against
(pos+size) transitively check "size" itself,
assuming that "pos" is reasonable. */
if ((long) imm_expr.X_add_number < 0
|| ((unsigned long) imm_expr.X_add_number
+ lastpos) < limlo
|| ((unsigned long) imm_expr.X_add_number
+ lastpos) > limhi)
{
as_bad (_("Improper insert size (%lu, position %lu)"),
(unsigned long) imm_expr.X_add_number,
(unsigned long) lastpos);
imm_expr.X_add_number = limlo - lastpos;
}
ip->insn_opcode |= ((lastpos + imm_expr.X_add_number - 1)
& OP_MASK_INSMSB) << OP_SH_INSMSB;
imm_expr.X_op = O_absent;
s = expr_end;
continue;
case 'C': /* ext size, becomes MSBD. */
limlo = 1;
limhi = 32;
goto do_msbd;
case 'G':
limlo = 33;
limhi = 64;
goto do_msbd;
case 'H':
limlo = 33;
limhi = 64;
goto do_msbd;
do_msbd:
my_getExpression (&imm_expr, s);
check_absolute_expr (ip, &imm_expr);
/* Check for negative input so that small negative numbers
will not succeed incorrectly. The checks against
(pos+size) transitively check "size" itself,
assuming that "pos" is reasonable. */
if ((long) imm_expr.X_add_number < 0
|| ((unsigned long) imm_expr.X_add_number
+ lastpos) < limlo
|| ((unsigned long) imm_expr.X_add_number
+ lastpos) > limhi)
{
as_bad (_("Improper extract size (%lu, position %lu)"),
(unsigned long) imm_expr.X_add_number,
(unsigned long) lastpos);
imm_expr.X_add_number = limlo - lastpos;
}
ip->insn_opcode |= ((imm_expr.X_add_number - 1)
& OP_MASK_EXTMSBD) << OP_SH_EXTMSBD;
imm_expr.X_op = O_absent;
s = expr_end;
continue;
case 'D':
/* +D is for disassembly only; never match. */
break;
case 'I':
/* "+I" is like "I", except that imm2_expr is used. */
my_getExpression (&imm2_expr, s);
if (imm2_expr.X_op != O_big
&& imm2_expr.X_op != O_constant)
insn_error = _("absolute expression required");
normalize_constant_expr (&imm2_expr);
s = expr_end;
continue;
default:
as_bad (_("internal: bad mips opcode (unknown extension operand type `+%c'): %s %s"),
*args, insn->name, insn->args);
/* Further processing is fruitless. */
return;
}
break;
case '<': /* must be at least one digit */
/*
* According to the manual, if the shift amount is greater
* than 31 or less than 0, then the shift amount should be
* mod 32. In reality the mips assembler issues an error.
* We issue a warning and mask out all but the low 5 bits.
*/
my_getExpression (&imm_expr, s);
check_absolute_expr (ip, &imm_expr);
if ((unsigned long) imm_expr.X_add_number > 31)
{
as_warn (_("Improper shift amount (%lu)"),
(unsigned long) imm_expr.X_add_number);
imm_expr.X_add_number &= OP_MASK_SHAMT;
}
ip->insn_opcode |= imm_expr.X_add_number << OP_SH_SHAMT;
imm_expr.X_op = O_absent;
s = expr_end;
continue;
case '>': /* shift amount minus 32 */
my_getExpression (&imm_expr, s);
check_absolute_expr (ip, &imm_expr);
if ((unsigned long) imm_expr.X_add_number < 32
|| (unsigned long) imm_expr.X_add_number > 63)
break;
ip->insn_opcode |= (imm_expr.X_add_number - 32) << OP_SH_SHAMT;
imm_expr.X_op = O_absent;
s = expr_end;
continue;
case 'k': /* cache code */
case 'h': /* prefx code */
my_getExpression (&imm_expr, s);
check_absolute_expr (ip, &imm_expr);
if ((unsigned long) imm_expr.X_add_number > 31)
{
as_warn (_("Invalid value for `%s' (%lu)"),
ip->insn_mo->name,
(unsigned long) imm_expr.X_add_number);
imm_expr.X_add_number &= 0x1f;
}
if (*args == 'k')
ip->insn_opcode |= imm_expr.X_add_number << OP_SH_CACHE;
else
ip->insn_opcode |= imm_expr.X_add_number << OP_SH_PREFX;
imm_expr.X_op = O_absent;
s = expr_end;
continue;
case 'c': /* break code */
my_getExpression (&imm_expr, s);
check_absolute_expr (ip, &imm_expr);
if ((unsigned long) imm_expr.X_add_number > 1023)
{
as_warn (_("Illegal break code (%lu)"),
(unsigned long) imm_expr.X_add_number);
imm_expr.X_add_number &= OP_MASK_CODE;
}
ip->insn_opcode |= imm_expr.X_add_number << OP_SH_CODE;
imm_expr.X_op = O_absent;
s = expr_end;
continue;
case 'q': /* lower break code */
my_getExpression (&imm_expr, s);
check_absolute_expr (ip, &imm_expr);
if ((unsigned long) imm_expr.X_add_number > 1023)
{
as_warn (_("Illegal lower break code (%lu)"),
(unsigned long) imm_expr.X_add_number);
imm_expr.X_add_number &= OP_MASK_CODE2;
}
ip->insn_opcode |= imm_expr.X_add_number << OP_SH_CODE2;
imm_expr.X_op = O_absent;
s = expr_end;
continue;
case 'B': /* 20-bit syscall/break code. */
my_getExpression (&imm_expr, s);
check_absolute_expr (ip, &imm_expr);
if ((unsigned long) imm_expr.X_add_number > OP_MASK_CODE20)
as_warn (_("Illegal 20-bit code (%lu)"),
(unsigned long) imm_expr.X_add_number);
ip->insn_opcode |= imm_expr.X_add_number << OP_SH_CODE20;
imm_expr.X_op = O_absent;
s = expr_end;
continue;
case 'C': /* Coprocessor code */
my_getExpression (&imm_expr, s);
check_absolute_expr (ip, &imm_expr);
if ((unsigned long) imm_expr.X_add_number >= (1 << 25))
{
as_warn (_("Coproccesor code > 25 bits (%lu)"),
(unsigned long) imm_expr.X_add_number);
imm_expr.X_add_number &= ((1 << 25) - 1);
}
ip->insn_opcode |= imm_expr.X_add_number;
imm_expr.X_op = O_absent;
s = expr_end;
continue;
case 'J': /* 19-bit wait code. */
my_getExpression (&imm_expr, s);
check_absolute_expr (ip, &imm_expr);
if ((unsigned long) imm_expr.X_add_number > OP_MASK_CODE19)
as_warn (_("Illegal 19-bit code (%lu)"),
(unsigned long) imm_expr.X_add_number);
ip->insn_opcode |= imm_expr.X_add_number << OP_SH_CODE19;
imm_expr.X_op = O_absent;
s = expr_end;
continue;
case 'P': /* Performance register */
my_getExpression (&imm_expr, s);
check_absolute_expr (ip, &imm_expr);
if (imm_expr.X_add_number != 0 && imm_expr.X_add_number != 1)
{
as_warn (_("Invalid performance register (%lu)"),
(unsigned long) imm_expr.X_add_number);
imm_expr.X_add_number &= OP_MASK_PERFREG;
}
ip->insn_opcode |= (imm_expr.X_add_number << OP_SH_PERFREG);
imm_expr.X_op = O_absent;
s = expr_end;
continue;
case 'b': /* base register */
case 'd': /* destination register */
case 's': /* source register */
case 't': /* target register */
case 'r': /* both target and source */
case 'v': /* both dest and source */
case 'w': /* both dest and target */
case 'E': /* coprocessor target register */
case 'G': /* coprocessor destination register */
case 'K': /* 'rdhwr' destination register */
case 'x': /* ignore register name */
case 'z': /* must be zero register */
case 'U': /* destination register (clo/clz). */
s_reset = s;
if (s[0] == '$')
{
if (ISDIGIT (s[1]))
{
++s;
regno = 0;
do
{
regno *= 10;
regno += *s - '0';
++s;
}
while (ISDIGIT (*s));
if (regno > 31)
as_bad (_("Invalid register number (%d)"), regno);
}
else if (*args == 'E' || *args == 'G' || *args == 'K')
goto notreg;
else
{
if (s[1] == 'r' && s[2] == 'a')
{
s += 3;
regno = RA;
}
else if (s[1] == 'f' && s[2] == 'p')
{
s += 3;
regno = FP;
}
else if (s[1] == 's' && s[2] == 'p')
{
s += 3;
regno = SP;
}
else if (s[1] == 'g' && s[2] == 'p')
{
s += 3;
regno = GP;
}
else if (s[1] == 'a' && s[2] == 't')
{
s += 3;
regno = AT;
}
else if (s[1] == 'k' && s[2] == 't' && s[3] == '0')
{
s += 4;
regno = KT0;
}
else if (s[1] == 'k' && s[2] == 't' && s[3] == '1')
{
s += 4;
regno = KT1;
}
else if (s[1] == 'z' && s[2] == 'e' && s[3] == 'r' && s[4] == 'o')
{
s += 5;
regno = ZERO;
}
else if (itbl_have_entries)
{
char *p, *n;
unsigned long r;
p = s + 1; /* advance past '$' */
n = itbl_get_field (&p); /* n is name */
/* See if this is a register defined in an
itbl entry. */
if (itbl_get_reg_val (n, &r))
{
/* Get_field advances to the start of
the next field, so we need to back
rack to the end of the last field. */
if (p)
s = p - 1;
else
s = strchr (s, '\0');
regno = r;
}
else
goto notreg;
}
else
goto notreg;
}
if (regno == AT
&& ! mips_opts.noat
&& *args != 'E'
&& *args != 'G'
&& *args != 'K')
as_warn (_("Used $at without \".set noat\""));
c = *args;
if (*s == ' ')
++s;
if (args[1] != *s)
{
if (c == 'r' || c == 'v' || c == 'w')
{
regno = lastregno;
s = s_reset;
++args;
}
}
/* 'z' only matches $0. */
if (c == 'z' && regno != 0)
break;
/* Now that we have assembled one operand, we use the args string
* to figure out where it goes in the instruction. */
switch (c)
{
case 'r':
case 's':
case 'v':
case 'b':
ip->insn_opcode |= regno << OP_SH_RS;
break;
case 'd':
case 'G':
case 'K':
ip->insn_opcode |= regno << OP_SH_RD;
break;
case 'U':
ip->insn_opcode |= regno << OP_SH_RD;
ip->insn_opcode |= regno << OP_SH_RT;
break;
case 'w':
case 't':
case 'E':
ip->insn_opcode |= regno << OP_SH_RT;
break;
case 'x':
/* This case exists because on the r3000 trunc
expands into a macro which requires a gp
register. On the r6000 or r4000 it is
assembled into a single instruction which
ignores the register. Thus the insn version
is MIPS_ISA2 and uses 'x', and the macro
version is MIPS_ISA1 and uses 't'. */
break;
case 'z':
/* This case is for the div instruction, which
acts differently if the destination argument
is $0. This only matches $0, and is checked
outside the switch. */
break;
case 'D':
/* Itbl operand; not yet implemented. FIXME ?? */
break;
/* What about all other operands like 'i', which
can be specified in the opcode table? */
}
lastregno = regno;
continue;
}
notreg:
switch (*args++)
{
case 'r':
case 'v':
ip->insn_opcode |= lastregno << OP_SH_RS;
continue;
case 'w':
ip->insn_opcode |= lastregno << OP_SH_RT;
continue;
}
break;
case 'O': /* MDMX alignment immediate constant. */
my_getExpression (&imm_expr, s);
check_absolute_expr (ip, &imm_expr);
if ((unsigned long) imm_expr.X_add_number > OP_MASK_ALN)
{
as_warn ("Improper align amount (%ld), using low bits",
(long) imm_expr.X_add_number);
imm_expr.X_add_number &= OP_MASK_ALN;
}
ip->insn_opcode |= imm_expr.X_add_number << OP_SH_ALN;
imm_expr.X_op = O_absent;
s = expr_end;
continue;
case 'Q': /* MDMX vector, element sel, or const. */
if (s[0] != '$')
{
/* MDMX Immediate. */
my_getExpression (&imm_expr, s);
check_absolute_expr (ip, &imm_expr);
if ((unsigned long) imm_expr.X_add_number > OP_MASK_FT)
{
as_warn (_("Invalid MDMX Immediate (%ld)"),
(long) imm_expr.X_add_number);
imm_expr.X_add_number &= OP_MASK_FT;
}
imm_expr.X_add_number &= OP_MASK_FT;
if (ip->insn_opcode & (OP_MASK_VSEL << OP_SH_VSEL))
ip->insn_opcode |= MDMX_FMTSEL_IMM_QH << OP_SH_VSEL;
else
ip->insn_opcode |= MDMX_FMTSEL_IMM_OB << OP_SH_VSEL;
ip->insn_opcode |= imm_expr.X_add_number << OP_SH_FT;
imm_expr.X_op = O_absent;
s = expr_end;
continue;
}
/* Not MDMX Immediate. Fall through. */
case 'X': /* MDMX destination register. */
case 'Y': /* MDMX source register. */
case 'Z': /* MDMX target register. */
is_mdmx = 1;
case 'D': /* floating point destination register */
case 'S': /* floating point source register */
case 'T': /* floating point target register */
case 'R': /* floating point source register */
case 'V':
case 'W':
s_reset = s;
/* Accept $fN for FP and MDMX register numbers, and in
addition accept $vN for MDMX register numbers. */
if ((s[0] == '$' && s[1] == 'f' && ISDIGIT (s[2]))
|| (is_mdmx != 0 && s[0] == '$' && s[1] == 'v'
&& ISDIGIT (s[2])))
{
s += 2;
regno = 0;
do
{
regno *= 10;
regno += *s - '0';
++s;
}
while (ISDIGIT (*s));
if (regno > 31)
as_bad (_("Invalid float register number (%d)"), regno);
if ((regno & 1) != 0
&& HAVE_32BIT_FPRS
&& ! (strcmp (str, "mtc1") == 0
|| strcmp (str, "mfc1") == 0
|| strcmp (str, "lwc1") == 0
|| strcmp (str, "swc1") == 0
|| strcmp (str, "l.s") == 0
|| strcmp (str, "s.s") == 0))
as_warn (_("Float register should be even, was %d"),
regno);
c = *args;
if (*s == ' ')
++s;
if (args[1] != *s)
{
if (c == 'V' || c == 'W')
{
regno = lastregno;
s = s_reset;
++args;
}
}
switch (c)
{
case 'D':
case 'X':
ip->insn_opcode |= regno << OP_SH_FD;
break;
case 'V':
case 'S':
case 'Y':
ip->insn_opcode |= regno << OP_SH_FS;
break;
case 'Q':
/* This is like 'Z', but also needs to fix the MDMX
vector/scalar select bits. Note that the
scalar immediate case is handled above. */
if (*s == '[')
{
int is_qh = (ip->insn_opcode & (1 << OP_SH_VSEL));
int max_el = (is_qh ? 3 : 7);
s++;
my_getExpression(&imm_expr, s);
check_absolute_expr (ip, &imm_expr);
s = expr_end;
if (imm_expr.X_add_number > max_el)
as_bad(_("Bad element selector %ld"),
(long) imm_expr.X_add_number);
imm_expr.X_add_number &= max_el;
ip->insn_opcode |= (imm_expr.X_add_number
<< (OP_SH_VSEL +
(is_qh ? 2 : 1)));
if (*s != ']')
as_warn(_("Expecting ']' found '%s'"), s);
else
s++;
}
else
{
if (ip->insn_opcode & (OP_MASK_VSEL << OP_SH_VSEL))
ip->insn_opcode |= (MDMX_FMTSEL_VEC_QH
<< OP_SH_VSEL);
else
ip->insn_opcode |= (MDMX_FMTSEL_VEC_OB <<
OP_SH_VSEL);
}
/* Fall through */
case 'W':
case 'T':
case 'Z':
ip->insn_opcode |= regno << OP_SH_FT;
break;
case 'R':
ip->insn_opcode |= regno << OP_SH_FR;
break;
}
lastregno = regno;
continue;
}
switch (*args++)
{
case 'V':
ip->insn_opcode |= lastregno << OP_SH_FS;
continue;
case 'W':
ip->insn_opcode |= lastregno << OP_SH_FT;
continue;
}
break;
case 'I':
my_getExpression (&imm_expr, s);
if (imm_expr.X_op != O_big
&& imm_expr.X_op != O_constant)
insn_error = _("absolute expression required");
normalize_constant_expr (&imm_expr);
s = expr_end;
continue;
case 'A':
my_getExpression (&offset_expr, s);
*imm_reloc = BFD_RELOC_32;
s = expr_end;
continue;
case 'F':
case 'L':
case 'f':
case 'l':
{
int f64;
int using_gprs;
char *save_in;
char *err;
unsigned char temp[8];
int len;
unsigned int length;
segT seg;
subsegT subseg;
char *p;
/* These only appear as the last operand in an
instruction, and every instruction that accepts
them in any variant accepts them in all variants.
This means we don't have to worry about backing out
any changes if the instruction does not match.
The difference between them is the size of the
floating point constant and where it goes. For 'F'
and 'L' the constant is 64 bits; for 'f' and 'l' it
is 32 bits. Where the constant is placed is based
on how the MIPS assembler does things:
F -- .rdata
L -- .lit8
f -- immediate value
l -- .lit4
The .lit4 and .lit8 sections are only used if
permitted by the -G argument.
The code below needs to know whether the target register
is 32 or 64 bits wide. It relies on the fact 'f' and
'F' are used with GPR-based instructions and 'l' and
'L' are used with FPR-based instructions. */
f64 = *args == 'F' || *args == 'L';
using_gprs = *args == 'F' || *args == 'f';
save_in = input_line_pointer;
input_line_pointer = s;
err = md_atof (f64 ? 'd' : 'f', (char *) temp, &len);
length = len;
s = input_line_pointer;
input_line_pointer = save_in;
if (err != NULL && *err != '\0')
{
as_bad (_("Bad floating point constant: %s"), err);
memset (temp, '\0', sizeof temp);
length = f64 ? 8 : 4;
}
assert (length == (unsigned) (f64 ? 8 : 4));
if (*args == 'f'
|| (*args == 'l'
&& (g_switch_value < 4
|| (temp[0] == 0 && temp[1] == 0)
|| (temp[2] == 0 && temp[3] == 0))))
{
imm_expr.X_op = O_constant;
if (! target_big_endian)
imm_expr.X_add_number = bfd_getl32 (temp);
else
imm_expr.X_add_number = bfd_getb32 (temp);
}
else if (length > 4
&& ! mips_disable_float_construction
/* Constants can only be constructed in GPRs and
copied to FPRs if the GPRs are at least as wide
as the FPRs. Force the constant into memory if
we are using 64-bit FPRs but the GPRs are only
32 bits wide. */
&& (using_gprs
|| ! (HAVE_64BIT_FPRS && HAVE_32BIT_GPRS))
&& ((temp[0] == 0 && temp[1] == 0)
|| (temp[2] == 0 && temp[3] == 0))
&& ((temp[4] == 0 && temp[5] == 0)
|| (temp[6] == 0 && temp[7] == 0)))
{
/* The value is simple enough to load with a couple of
instructions. If using 32-bit registers, set
imm_expr to the high order 32 bits and offset_expr to
the low order 32 bits. Otherwise, set imm_expr to
the entire 64 bit constant. */
if (using_gprs ? HAVE_32BIT_GPRS : HAVE_32BIT_FPRS)
{
imm_expr.X_op = O_constant;
offset_expr.X_op = O_constant;
if (! target_big_endian)
{
imm_expr.X_add_number = bfd_getl32 (temp + 4);
offset_expr.X_add_number = bfd_getl32 (temp);
}
else
{
imm_expr.X_add_number = bfd_getb32 (temp);
offset_expr.X_add_number = bfd_getb32 (temp + 4);
}
if (offset_expr.X_add_number == 0)
offset_expr.X_op = O_absent;
}
else if (sizeof (imm_expr.X_add_number) > 4)
{
imm_expr.X_op = O_constant;
if (! target_big_endian)
imm_expr.X_add_number = bfd_getl64 (temp);
else
imm_expr.X_add_number = bfd_getb64 (temp);
}
else
{
imm_expr.X_op = O_big;
imm_expr.X_add_number = 4;
if (! target_big_endian)
{
generic_bignum[0] = bfd_getl16 (temp);
generic_bignum[1] = bfd_getl16 (temp + 2);
generic_bignum[2] = bfd_getl16 (temp + 4);
generic_bignum[3] = bfd_getl16 (temp + 6);
}
else
{
generic_bignum[0] = bfd_getb16 (temp + 6);
generic_bignum[1] = bfd_getb16 (temp + 4);
generic_bignum[2] = bfd_getb16 (temp + 2);
generic_bignum[3] = bfd_getb16 (temp);
}
}
}
else
{
const char *newname;
segT new_seg;
/* Switch to the right section. */
seg = now_seg;
subseg = now_subseg;
switch (*args)
{
default: /* unused default case avoids warnings. */
case 'L':
newname = RDATA_SECTION_NAME;
if (g_switch_value >= 8)
newname = ".lit8";
break;
case 'F':
newname = RDATA_SECTION_NAME;
break;
case 'l':
assert (g_switch_value >= 4);
newname = ".lit4";
break;
}
new_seg = subseg_new (newname, (subsegT) 0);
if (OUTPUT_FLAVOR == bfd_target_elf_flavour)
bfd_set_section_flags (stdoutput, new_seg,
(SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
| SEC_DATA));
frag_align (*args == 'l' ? 2 : 3, 0, 0);
if (OUTPUT_FLAVOR == bfd_target_elf_flavour
&& strcmp (TARGET_OS, "elf") != 0)
record_alignment (new_seg, 4);
else
record_alignment (new_seg, *args == 'l' ? 2 : 3);
if (seg == now_seg)
as_bad (_("Can't use floating point insn in this section"));
/* Set the argument to the current address in the
section. */
offset_expr.X_op = O_symbol;
offset_expr.X_add_symbol =
symbol_new ("L0\001", now_seg,
(valueT) frag_now_fix (), frag_now);
offset_expr.X_add_number = 0;
/* Put the floating point number into the section. */
p = frag_more ((int) length);
memcpy (p, temp, length);
/* Switch back to the original section. */
subseg_set (seg, subseg);
}
}
continue;
case 'i': /* 16 bit unsigned immediate */
case 'j': /* 16 bit signed immediate */
*imm_reloc = BFD_RELOC_LO16;
if (my_getSmallExpression (&imm_expr, imm_reloc, s) == 0)
{
int more;
offsetT minval, maxval;
more = (insn + 1 < &mips_opcodes[NUMOPCODES]
&& strcmp (insn->name, insn[1].name) == 0);
/* If the expression was written as an unsigned number,
only treat it as signed if there are no more
alternatives. */
if (more
&& *args == 'j'
&& sizeof (imm_expr.X_add_number) <= 4
&& imm_expr.X_op == O_constant
&& imm_expr.X_add_number < 0
&& imm_expr.X_unsigned
&& HAVE_64BIT_GPRS)
break;
/* For compatibility with older assemblers, we accept
0x8000-0xffff as signed 16-bit numbers when only
signed numbers are allowed. */
if (*args == 'i')
minval = 0, maxval = 0xffff;
else if (more)
minval = -0x8000, maxval = 0x7fff;
else
minval = -0x8000, maxval = 0xffff;
if (imm_expr.X_op != O_constant
|| imm_expr.X_add_number < minval
|| imm_expr.X_add_number > maxval)
{
if (more)
break;
if (imm_expr.X_op == O_constant
|| imm_expr.X_op == O_big)
as_bad (_("expression out of range"));
}
}
s = expr_end;
continue;
case 'o': /* 16 bit offset */
/* Check whether there is only a single bracketed expression
left. If so, it must be the base register and the
constant must be zero. */
if (*s == '(' && strchr (s + 1, '(') == 0)
{
offset_expr.X_op = O_constant;
offset_expr.X_add_number = 0;
continue;
}
/* If this value won't fit into a 16 bit offset, then go
find a macro that will generate the 32 bit offset
code pattern. */
if (my_getSmallExpression (&offset_expr, offset_reloc, s) == 0
&& (offset_expr.X_op != O_constant
|| offset_expr.X_add_number >= 0x8000
|| offset_expr.X_add_number < -0x8000))
break;
s = expr_end;
continue;
case 'p': /* pc relative offset */
*offset_reloc = BFD_RELOC_16_PCREL_S2;
my_getExpression (&offset_expr, s);
s = expr_end;
continue;
case 'u': /* upper 16 bits */
if (my_getSmallExpression (&imm_expr, imm_reloc, s) == 0
&& imm_expr.X_op == O_constant
&& (imm_expr.X_add_number < 0
|| imm_expr.X_add_number >= 0x10000))
as_bad (_("lui expression not in range 0..65535"));
s = expr_end;
continue;
case 'a': /* 26 bit address */
my_getExpression (&offset_expr, s);
s = expr_end;
*offset_reloc = BFD_RELOC_MIPS_JMP;
continue;
case 'N': /* 3 bit branch condition code */
case 'M': /* 3 bit compare condition code */
if (strncmp (s, "$fcc", 4) != 0)
break;
s += 4;
regno = 0;
do
{
regno *= 10;
regno += *s - '0';
++s;
}
while (ISDIGIT (*s));
if (regno > 7)
as_bad (_("Invalid condition code register $fcc%d"), regno);
if ((strcmp(str + strlen(str) - 3, ".ps") == 0
|| strcmp(str + strlen(str) - 5, "any2f") == 0
|| strcmp(str + strlen(str) - 5, "any2t") == 0)
&& (regno & 1) != 0)
as_warn(_("Condition code register should be even for %s, was %d"),
str, regno);
if ((strcmp(str + strlen(str) - 5, "any4f") == 0
|| strcmp(str + strlen(str) - 5, "any4t") == 0)
&& (regno & 3) != 0)
as_warn(_("Condition code register should be 0 or 4 for %s, was %d"),
str, regno);
if (*args == 'N')
ip->insn_opcode |= regno << OP_SH_BCC;
else
ip->insn_opcode |= regno << OP_SH_CCC;
continue;
case 'H':
if (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'))
s += 2;
if (ISDIGIT (*s))
{
c = 0;
do
{
c *= 10;
c += *s - '0';
++s;
}
while (ISDIGIT (*s));
}
else
c = 8; /* Invalid sel value. */
if (c > 7)
as_bad (_("invalid coprocessor sub-selection value (0-7)"));
ip->insn_opcode |= c;
continue;
case 'e':
/* Must be at least one digit. */
my_getExpression (&imm_expr, s);
check_absolute_expr (ip, &imm_expr);
if ((unsigned long) imm_expr.X_add_number
> (unsigned long) OP_MASK_VECBYTE)
{
as_bad (_("bad byte vector index (%ld)"),
(long) imm_expr.X_add_number);
imm_expr.X_add_number = 0;
}
ip->insn_opcode |= imm_expr.X_add_number << OP_SH_VECBYTE;
imm_expr.X_op = O_absent;
s = expr_end;
continue;
case '%':
my_getExpression (&imm_expr, s);
check_absolute_expr (ip, &imm_expr);
if ((unsigned long) imm_expr.X_add_number
> (unsigned long) OP_MASK_VECALIGN)
{
as_bad (_("bad byte vector index (%ld)"),
(long) imm_expr.X_add_number);
imm_expr.X_add_number = 0;
}
ip->insn_opcode |= imm_expr.X_add_number << OP_SH_VECALIGN;
imm_expr.X_op = O_absent;
s = expr_end;
continue;
default:
as_bad (_("bad char = '%c'\n"), *args);
internalError ();
}
break;
}
/* Args don't match. */
if (insn + 1 < &mips_opcodes[NUMOPCODES] &&
!strcmp (insn->name, insn[1].name))
{
++insn;
s = argsStart;
insn_error = _("illegal operands");
continue;
}
if (save_c)
*(--s) = save_c;
insn_error = _("illegal operands");
return;
}
}
/* This routine assembles an instruction into its binary format when
assembling for the mips16. As a side effect, it sets one of the
global variables imm_reloc or offset_reloc to the type of
relocation to do if one of the operands is an address expression.
It also sets mips16_small and mips16_ext if the user explicitly
requested a small or extended instruction. */
static void
mips16_ip (char *str, struct mips_cl_insn *ip)
{
char *s;
const char *args;
struct mips_opcode *insn;
char *argsstart;
unsigned int regno;
unsigned int lastregno = 0;
char *s_reset;
insn_error = NULL;
mips16_small = FALSE;
mips16_ext = FALSE;
for (s = str; ISLOWER (*s); ++s)
;
switch (*s)
{
case '\0':
break;
case ' ':
*s++ = '\0';
break;
case '.':
if (s[1] == 't' && s[2] == ' ')
{
*s = '\0';
mips16_small = TRUE;
s += 3;
break;
}
else if (s[1] == 'e' && s[2] == ' ')
{
*s = '\0';
mips16_ext = TRUE;
s += 3;
break;
}
/* Fall through. */
default:
insn_error = _("unknown opcode");
return;
}
if (mips_opts.noautoextend && ! mips16_ext)
mips16_small = TRUE;
if ((insn = (struct mips_opcode *) hash_find (mips16_op_hash, str)) == NULL)
{
insn_error = _("unrecognized opcode");
return;
}
argsstart = s;
for (;;)
{
assert (strcmp (insn->name, str) == 0);
ip->insn_mo = insn;
ip->insn_opcode = insn->match;
ip->use_extend = FALSE;
imm_expr.X_op = O_absent;
imm_reloc[0] = BFD_RELOC_UNUSED;
imm_reloc[1] = BFD_RELOC_UNUSED;
imm_reloc[2] = BFD_RELOC_UNUSED;
imm2_expr.X_op = O_absent;
offset_expr.X_op = O_absent;
offset_reloc[0] = BFD_RELOC_UNUSED;
offset_reloc[1] = BFD_RELOC_UNUSED;
offset_reloc[2] = BFD_RELOC_UNUSED;
for (args = insn->args; 1; ++args)
{
int c;
if (*s == ' ')
++s;
/* In this switch statement we call break if we did not find
a match, continue if we did find a match, or return if we
are done. */
c = *args;
switch (c)
{
case '\0':
if (*s == '\0')
{
/* Stuff the immediate value in now, if we can. */
if (imm_expr.X_op == O_constant
&& *imm_reloc > BFD_RELOC_UNUSED
&& insn->pinfo != INSN_MACRO)
{
mips16_immed (NULL, 0, *imm_reloc - BFD_RELOC_UNUSED,
imm_expr.X_add_number, TRUE, mips16_small,
mips16_ext, &ip->insn_opcode,
&ip->use_extend, &ip->extend);
imm_expr.X_op = O_absent;
*imm_reloc = BFD_RELOC_UNUSED;
}
return;
}
break;
case ',':
if (*s++ == c)
continue;
s--;
switch (*++args)
{
case 'v':
ip->insn_opcode |= lastregno << MIPS16OP_SH_RX;
continue;
case 'w':
ip->insn_opcode |= lastregno << MIPS16OP_SH_RY;
continue;
}
break;
case '(':
case ')':
if (*s++ == c)
continue;
break;
case 'v':
case 'w':
if (s[0] != '$')
{
if (c == 'v')
ip->insn_opcode |= lastregno << MIPS16OP_SH_RX;
else
ip->insn_opcode |= lastregno << MIPS16OP_SH_RY;
++args;
continue;
}
/* Fall through. */
case 'x':
case 'y':
case 'z':
case 'Z':
case '0':
case 'S':
case 'R':
case 'X':
case 'Y':
if (s[0] != '$')
break;
s_reset = s;
if (ISDIGIT (s[1]))
{
++s;
regno = 0;
do
{
regno *= 10;
regno += *s - '0';
++s;
}
while (ISDIGIT (*s));
if (regno > 31)
{
as_bad (_("invalid register number (%d)"), regno);
regno = 2;
}
}
else
{
if (s[1] == 'r' && s[2] == 'a')
{
s += 3;
regno = RA;
}
else if (s[1] == 'f' && s[2] == 'p')
{
s += 3;
regno = FP;
}
else if (s[1] == 's' && s[2] == 'p')
{
s += 3;
regno = SP;
}
else if (s[1] == 'g' && s[2] == 'p')
{
s += 3;
regno = GP;
}
else if (s[1] == 'a' && s[2] == 't')
{
s += 3;
regno = AT;
}
else if (s[1] == 'k' && s[2] == 't' && s[3] == '0')
{
s += 4;
regno = KT0;
}
else if (s[1] == 'k' && s[2] == 't' && s[3] == '1')
{
s += 4;
regno = KT1;
}
else if (s[1] == 'z' && s[2] == 'e' && s[3] == 'r' && s[4] == 'o')
{
s += 5;
regno = ZERO;
}
else
break;
}
if (*s == ' ')
++s;
if (args[1] != *s)
{
if (c == 'v' || c == 'w')
{
regno = mips16_to_32_reg_map[lastregno];
s = s_reset;
++args;
}
}
switch (c)
{
case 'x':
case 'y':
case 'z':
case 'v':
case 'w':
case 'Z':
regno = mips32_to_16_reg_map[regno];
break;
case '0':
if (regno != 0)
regno = ILLEGAL_REG;
break;
case 'S':
if (regno != SP)
regno = ILLEGAL_REG;
break;
case 'R':
if (regno != RA)
regno = ILLEGAL_REG;
break;
case 'X':
case 'Y':
if (regno == AT && ! mips_opts.noat)
as_warn (_("used $at without \".set noat\""));
break;
default:
internalError ();
}
if (regno == ILLEGAL_REG)
break;
switch (c)
{
case 'x':
case 'v':
ip->insn_opcode |= regno << MIPS16OP_SH_RX;
break;
case 'y':
case 'w':
ip->insn_opcode |= regno << MIPS16OP_SH_RY;
break;
case 'z':
ip->insn_opcode |= regno << MIPS16OP_SH_RZ;
break;
case 'Z':
ip->insn_opcode |= regno << MIPS16OP_SH_MOVE32Z;
case '0':
case 'S':
case 'R':
break;
case 'X':
ip->insn_opcode |= regno << MIPS16OP_SH_REGR32;
break;
case 'Y':
regno = ((regno & 7) << 2) | ((regno & 0x18) >> 3);
ip->insn_opcode |= regno << MIPS16OP_SH_REG32R;
break;
default:
internalError ();
}
lastregno = regno;
continue;
case 'P':
if (strncmp (s, "$pc", 3) == 0)
{
s += 3;
continue;
}
break;
case '<':
case '>':
case '[':
case ']':
case '4':
case '5':
case 'H':
case 'W':
case 'D':
case 'j':
case '8':
case 'V':
case 'C':
case 'U':
case 'k':
case 'K':
if (s[0] == '%'
&& strncmp (s + 1, "gprel(", sizeof "gprel(" - 1) == 0)
{
/* This is %gprel(SYMBOL). We need to read SYMBOL,
and generate the appropriate reloc. If the text
inside %gprel is not a symbol name with an
optional offset, then we generate a normal reloc
and will probably fail later. */
my_getExpression (&imm_expr, s + sizeof "%gprel" - 1);
if (imm_expr.X_op == O_symbol)
{
mips16_ext = TRUE;
*imm_reloc = BFD_RELOC_MIPS16_GPREL;
s = expr_end;
ip->use_extend = TRUE;
ip->extend = 0;
continue;
}
}
else
{
/* Just pick up a normal expression. */
my_getExpression (&imm_expr, s);
}
if (imm_expr.X_op == O_register)
{
/* What we thought was an expression turned out to
be a register. */
if (s[0] == '(' && args[1] == '(')
{
/* It looks like the expression was omitted
before a register indirection, which means
that the expression is implicitly zero. We
still set up imm_expr, so that we handle
explicit extensions correctly. */
imm_expr.X_op = O_constant;
imm_expr.X_add_number = 0;
*imm_reloc = (int) BFD_RELOC_UNUSED + c;
continue;
}
break;
}
/* We need to relax this instruction. */
*imm_reloc = (int) BFD_RELOC_UNUSED + c;
s = expr_end;
continue;
case 'p':
case 'q':
case 'A':
case 'B':
case 'E':
/* We use offset_reloc rather than imm_reloc for the PC
relative operands. This lets macros with both
immediate and address operands work correctly. */
my_getExpression (&offset_expr, s);
if (offset_expr.X_op == O_register)
break;
/* We need to relax this instruction. */
*offset_reloc = (int) BFD_RELOC_UNUSED + c;
s = expr_end;
continue;
case '6': /* break code */
my_getExpression (&imm_expr, s);
check_absolute_expr (ip, &imm_expr);
if ((unsigned long) imm_expr.X_add_number > 63)
{
as_warn (_("Invalid value for `%s' (%lu)"),
ip->insn_mo->name,
(unsigned long) imm_expr.X_add_number);
imm_expr.X_add_number &= 0x3f;
}
ip->insn_opcode |= imm_expr.X_add_number << MIPS16OP_SH_IMM6;
imm_expr.X_op = O_absent;
s = expr_end;
continue;
case 'a': /* 26 bit address */
my_getExpression (&offset_expr, s);
s = expr_end;
*offset_reloc = BFD_RELOC_MIPS16_JMP;
ip->insn_opcode <<= 16;
continue;
case 'l': /* register list for entry macro */
case 'L': /* register list for exit macro */
{
int mask;
if (c == 'l')
mask = 0;
else
mask = 7 << 3;
while (*s != '\0')
{
int freg, reg1, reg2;
while (*s == ' ' || *s == ',')
++s;
if (*s != '$')
{
as_bad (_("can't parse register list"));
break;
}
++s;
if (*s != 'f')
freg = 0;
else
{
freg = 1;
++s;
}
reg1 = 0;
while (ISDIGIT (*s))
{
reg1 *= 10;
reg1 += *s - '0';
++s;
}
if (*s == ' ')
++s;
if (*s != '-')
reg2 = reg1;
else
{
++s;
if (*s != '$')
break;
++s;
if (freg)
{
if (*s == 'f')
++s;
else
{
as_bad (_("invalid register list"));
break;
}
}
reg2 = 0;
while (ISDIGIT (*s))
{
reg2 *= 10;
reg2 += *s - '0';
++s;
}
}
if (freg && reg1 == 0 && reg2 == 0 && c == 'L')
{
mask &= ~ (7 << 3);
mask |= 5 << 3;
}
else if (freg && reg1 == 0 && reg2 == 1 && c == 'L')
{
mask &= ~ (7 << 3);
mask |= 6 << 3;
}
else if (reg1 == 4 && reg2 >= 4 && reg2 <= 7 && c != 'L')
mask |= (reg2 - 3) << 3;
else if (reg1 == 16 && reg2 >= 16 && reg2 <= 17)
mask |= (reg2 - 15) << 1;
else if (reg1 == RA && reg2 == RA)
mask |= 1;
else
{
as_bad (_("invalid register list"));
break;
}
}
/* The mask is filled in in the opcode table for the
benefit of the disassembler. We remove it before
applying the actual mask. */
ip->insn_opcode &= ~ ((7 << 3) << MIPS16OP_SH_IMM6);
ip->insn_opcode |= mask << MIPS16OP_SH_IMM6;
}
continue;
case 'e': /* extend code */
my_getExpression (&imm_expr, s);
check_absolute_expr (ip, &imm_expr);
if ((unsigned long) imm_expr.X_add_number > 0x7ff)
{
as_warn (_("Invalid value for `%s' (%lu)"),
ip->insn_mo->name,
(unsigned long) imm_expr.X_add_number);
imm_expr.X_add_number &= 0x7ff;
}
ip->insn_opcode |= imm_expr.X_add_number;
imm_expr.X_op = O_absent;
s = expr_end;
continue;
default:
internalError ();
}
break;
}
/* Args don't match. */
if (insn + 1 < &mips16_opcodes[bfd_mips16_num_opcodes] &&
strcmp (insn->name, insn[1].name) == 0)
{
++insn;
s = argsstart;
continue;
}
insn_error = _("illegal operands");
return;
}
}
/* This structure holds information we know about a mips16 immediate
argument type. */
struct mips16_immed_operand
{
/* The type code used in the argument string in the opcode table. */
int type;
/* The number of bits in the short form of the opcode. */
int nbits;
/* The number of bits in the extended form of the opcode. */
int extbits;
/* The amount by which the short form is shifted when it is used;
for example, the sw instruction has a shift count of 2. */
int shift;
/* The amount by which the short form is shifted when it is stored
into the instruction code. */
int op_shift;
/* Non-zero if the short form is unsigned. */
int unsp;
/* Non-zero if the extended form is unsigned. */
int extu;
/* Non-zero if the value is PC relative. */
int pcrel;
};
/* The mips16 immediate operand types. */
static const struct mips16_immed_operand mips16_immed_operands[] =
{
{ '<', 3, 5, 0, MIPS16OP_SH_RZ, 1, 1, 0 },
{ '>', 3, 5, 0, MIPS16OP_SH_RX, 1, 1, 0 },
{ '[', 3, 6, 0, MIPS16OP_SH_RZ, 1, 1, 0 },
{ ']', 3, 6, 0, MIPS16OP_SH_RX, 1, 1, 0 },
{ '4', 4, 15, 0, MIPS16OP_SH_IMM4, 0, 0, 0 },
{ '5', 5, 16, 0, MIPS16OP_SH_IMM5, 1, 0, 0 },
{ 'H', 5, 16, 1, MIPS16OP_SH_IMM5, 1, 0, 0 },
{ 'W', 5, 16, 2, MIPS16OP_SH_IMM5, 1, 0, 0 },
{ 'D', 5, 16, 3, MIPS16OP_SH_IMM5, 1, 0, 0 },
{ 'j', 5, 16, 0, MIPS16OP_SH_IMM5, 0, 0, 0 },
{ '8', 8, 16, 0, MIPS16OP_SH_IMM8, 1, 0, 0 },
{ 'V', 8, 16, 2, MIPS16OP_SH_IMM8, 1, 0, 0 },
{ 'C', 8, 16, 3, MIPS16OP_SH_IMM8, 1, 0, 0 },
{ 'U', 8, 16, 0, MIPS16OP_SH_IMM8, 1, 1, 0 },
{ 'k', 8, 16, 0, MIPS16OP_SH_IMM8, 0, 0, 0 },
{ 'K', 8, 16, 3, MIPS16OP_SH_IMM8, 0, 0, 0 },
{ 'p', 8, 16, 0, MIPS16OP_SH_IMM8, 0, 0, 1 },
{ 'q', 11, 16, 0, MIPS16OP_SH_IMM8, 0, 0, 1 },
{ 'A', 8, 16, 2, MIPS16OP_SH_IMM8, 1, 0, 1 },
{ 'B', 5, 16, 3, MIPS16OP_SH_IMM5, 1, 0, 1 },
{ 'E', 5, 16, 2, MIPS16OP_SH_IMM5, 1, 0, 1 }
};
#define MIPS16_NUM_IMMED \
(sizeof mips16_immed_operands / sizeof mips16_immed_operands[0])
/* Handle a mips16 instruction with an immediate value. This or's the
small immediate value into *INSN. It sets *USE_EXTEND to indicate
whether an extended value is needed; if one is needed, it sets
*EXTEND to the value. The argument type is TYPE. The value is VAL.
If SMALL is true, an unextended opcode was explicitly requested.
If EXT is true, an extended opcode was explicitly requested. If
WARN is true, warn if EXT does not match reality. */
static void
mips16_immed (char *file, unsigned int line, int type, offsetT val,
bfd_boolean warn, bfd_boolean small, bfd_boolean ext,
unsigned long *insn, bfd_boolean *use_extend,
unsigned short *extend)
{
register const struct mips16_immed_operand *op;
int mintiny, maxtiny;
bfd_boolean needext;
op = mips16_immed_operands;
while (op->type != type)
{
++op;
assert (op < mips16_immed_operands + MIPS16_NUM_IMMED);
}
if (op->unsp)
{
if (type == '<' || type == '>' || type == '[' || type == ']')
{
mintiny = 1;
maxtiny = 1 << op->nbits;
}
else
{
mintiny = 0;
maxtiny = (1 << op->nbits) - 1;
}
}
else
{
mintiny = - (1 << (op->nbits - 1));
maxtiny = (1 << (op->nbits - 1)) - 1;
}
/* Branch offsets have an implicit 0 in the lowest bit. */
if (type == 'p' || type == 'q')
val /= 2;
if ((val & ((1 << op->shift) - 1)) != 0
|| val < (mintiny << op->shift)
|| val > (maxtiny << op->shift))
needext = TRUE;
else
needext = FALSE;
if (warn && ext && ! needext)
as_warn_where (file, line,
_("extended operand requested but not required"));
if (small && needext)
as_bad_where (file, line, _("invalid unextended operand value"));
if (small || (! ext && ! needext))
{
int insnval;
*use_extend = FALSE;
insnval = ((val >> op->shift) & ((1 << op->nbits) - 1));
insnval <<= op->op_shift;
*insn |= insnval;
}
else
{
long minext, maxext;
int extval;
if (op->extu)
{
minext = 0;
maxext = (1 << op->extbits) - 1;
}
else
{
minext = - (1 << (op->extbits - 1));
maxext = (1 << (op->extbits - 1)) - 1;
}
if (val < minext || val > maxext)
as_bad_where (file, line,
_("operand value out of range for instruction"));
*use_extend = TRUE;
if (op->extbits == 16)
{
extval = ((val >> 11) & 0x1f) | (val & 0x7e0);
val &= 0x1f;
}
else if (op->extbits == 15)
{
extval = ((val >> 11) & 0xf) | (val & 0x7f0);
val &= 0xf;
}
else
{
extval = ((val & 0x1f) << 6) | (val & 0x20);
val = 0;
}
*extend = (unsigned short) extval;
*insn |= val;
}
}
static const struct percent_op_match
{
const char *str;
bfd_reloc_code_real_type reloc;
} percent_op[] =
{
{"%lo", BFD_RELOC_LO16},
#ifdef OBJ_ELF
{"%call_hi", BFD_RELOC_MIPS_CALL_HI16},
{"%call_lo", BFD_RELOC_MIPS_CALL_LO16},
{"%call16", BFD_RELOC_MIPS_CALL16},
{"%got_disp", BFD_RELOC_MIPS_GOT_DISP},
{"%got_page", BFD_RELOC_MIPS_GOT_PAGE},
{"%got_ofst", BFD_RELOC_MIPS_GOT_OFST},
{"%got_hi", BFD_RELOC_MIPS_GOT_HI16},
{"%got_lo", BFD_RELOC_MIPS_GOT_LO16},
{"%got", BFD_RELOC_MIPS_GOT16},
{"%gp_rel", BFD_RELOC_GPREL16},
{"%half", BFD_RELOC_16},
{"%highest", BFD_RELOC_MIPS_HIGHEST},
{"%higher", BFD_RELOC_MIPS_HIGHER},
{"%neg", BFD_RELOC_MIPS_SUB},
#endif
{"%hi", BFD_RELOC_HI16_S}
};
/* Return true if *STR points to a relocation operator. When returning true,
move *STR over the operator and store its relocation code in *RELOC.
Leave both *STR and *RELOC alone when returning false. */
static bfd_boolean
parse_relocation (char **str, bfd_reloc_code_real_type *reloc)
{
size_t i;
for (i = 0; i < ARRAY_SIZE (percent_op); i++)
if (strncasecmp (*str, percent_op[i].str, strlen (percent_op[i].str)) == 0)
{
*str += strlen (percent_op[i].str);
*reloc = percent_op[i].reloc;
/* Check whether the output BFD supports this relocation.
If not, issue an error and fall back on something safe. */
if (!bfd_reloc_type_lookup (stdoutput, percent_op[i].reloc))
{
as_bad ("relocation %s isn't supported by the current ABI",
percent_op[i].str);
*reloc = BFD_RELOC_LO16;
}
return TRUE;
}
return FALSE;
}
/* Parse string STR as a 16-bit relocatable operand. Store the
expression in *EP and the relocations in the array starting
at RELOC. Return the number of relocation operators used.
On exit, EXPR_END points to the first character after the expression.
If no relocation operators are used, RELOC[0] is set to BFD_RELOC_LO16. */
static size_t
my_getSmallExpression (expressionS *ep, bfd_reloc_code_real_type *reloc,
char *str)
{
bfd_reloc_code_real_type reversed_reloc[3];
size_t reloc_index, i;
int crux_depth, str_depth;
char *crux;
/* Search for the start of the main expression, recoding relocations
in REVERSED_RELOC. End the loop with CRUX pointing to the start
of the main expression and with CRUX_DEPTH containing the number
of open brackets at that point. */
reloc_index = -1;
str_depth = 0;
do
{
reloc_index++;
crux = str;
crux_depth = str_depth;
/* Skip over whitespace and brackets, keeping count of the number
of brackets. */
while (*str == ' ' || *str == '\t' || *str == '(')
if (*str++ == '(')
str_depth++;
}
while (*str == '%'
&& reloc_index < (HAVE_NEWABI ? 3 : 1)
&& parse_relocation (&str, &reversed_reloc[reloc_index]));
my_getExpression (ep, crux);
str = expr_end;
/* Match every open bracket. */
while (crux_depth > 0 && (*str == ')' || *str == ' ' || *str == '\t'))
if (*str++ == ')')
crux_depth--;
if (crux_depth > 0)
as_bad ("unclosed '('");
expr_end = str;
if (reloc_index == 0)
reloc[0] = BFD_RELOC_LO16;
else
{
prev_reloc_op_frag = frag_now;
for (i = 0; i < reloc_index; i++)
reloc[i] = reversed_reloc[reloc_index - 1 - i];
}
return reloc_index;
}
static void
my_getExpression (expressionS *ep, char *str)
{
char *save_in;
valueT val;
save_in = input_line_pointer;
input_line_pointer = str;
expression (ep);
expr_end = input_line_pointer;
input_line_pointer = save_in;
/* If we are in mips16 mode, and this is an expression based on `.',
then we bump the value of the symbol by 1 since that is how other
text symbols are handled. We don't bother to handle complex
expressions, just `.' plus or minus a constant. */
if (mips_opts.mips16
&& ep->X_op == O_symbol
&& strcmp (S_GET_NAME (ep->X_add_symbol), FAKE_LABEL_NAME) == 0
&& S_GET_SEGMENT (ep->X_add_symbol) == now_seg
&& symbol_get_frag (ep->X_add_symbol) == frag_now
&& symbol_constant_p (ep->X_add_symbol)
&& (val = S_GET_VALUE (ep->X_add_symbol)) == frag_now_fix ())
S_SET_VALUE (ep->X_add_symbol, val + 1);
}
/* Turn a string in input_line_pointer into a floating point constant
of type TYPE, and store the appropriate bytes in *LITP. The number
of LITTLENUMS emitted is stored in *SIZEP. An error message is
returned, or NULL on OK. */
char *
md_atof (int type, char *litP, int *sizeP)
{
int prec;
LITTLENUM_TYPE words[4];
char *t;
int i;
switch (type)
{
case 'f':
prec = 2;
break;
case 'd':
prec = 4;
break;
default:
*sizeP = 0;
return _("bad call to md_atof");
}
t = atof_ieee (input_line_pointer, type, words);
if (t)
input_line_pointer = t;
*sizeP = prec * 2;
if (! target_big_endian)
{
for (i = prec - 1; i >= 0; i--)
{
md_number_to_chars (litP, words[i], 2);
litP += 2;
}
}
else
{
for (i = 0; i < prec; i++)
{
md_number_to_chars (litP, words[i], 2);
litP += 2;
}
}
return NULL;
}
void
md_number_to_chars (char *buf, valueT val, int n)
{
if (target_big_endian)
number_to_chars_bigendian (buf, val, n);
else
number_to_chars_littleendian (buf, val, n);
}
#ifdef OBJ_ELF
static int support_64bit_objects(void)
{
const char **list, **l;
int yes;
list = bfd_target_list ();
for (l = list; *l != NULL; l++)
#ifdef TE_TMIPS
/* This is traditional mips */
if (strcmp (*l, "elf64-tradbigmips") == 0
|| strcmp (*l, "elf64-tradlittlemips") == 0)
#else
if (strcmp (*l, "elf64-bigmips") == 0
|| strcmp (*l, "elf64-littlemips") == 0)
#endif
break;
yes = (*l != NULL);
free (list);
return yes;
}
#endif /* OBJ_ELF */
const char *md_shortopts = "O::g::G:";
struct option md_longopts[] =
{
/* Options which specify architecture. */
#define OPTION_ARCH_BASE (OPTION_MD_BASE)
#define OPTION_MARCH (OPTION_ARCH_BASE + 0)
{"march", required_argument, NULL, OPTION_MARCH},
#define OPTION_MTUNE (OPTION_ARCH_BASE + 1)
{"mtune", required_argument, NULL, OPTION_MTUNE},
#define OPTION_MIPS1 (OPTION_ARCH_BASE + 2)
{"mips0", no_argument, NULL, OPTION_MIPS1},
{"mips1", no_argument, NULL, OPTION_MIPS1},
#define OPTION_MIPS2 (OPTION_ARCH_BASE + 3)
{"mips2", no_argument, NULL, OPTION_MIPS2},
#define OPTION_MIPS3 (OPTION_ARCH_BASE + 4)
{"mips3", no_argument, NULL, OPTION_MIPS3},
#define OPTION_MIPS4 (OPTION_ARCH_BASE + 5)
{"mips4", no_argument, NULL, OPTION_MIPS4},
#define OPTION_MIPS5 (OPTION_ARCH_BASE + 6)
{"mips5", no_argument, NULL, OPTION_MIPS5},
#define OPTION_MIPS32 (OPTION_ARCH_BASE + 7)
{"mips32", no_argument, NULL, OPTION_MIPS32},
#define OPTION_MIPS64 (OPTION_ARCH_BASE + 8)
{"mips64", no_argument, NULL, OPTION_MIPS64},
#define OPTION_MIPS32R2 (OPTION_ARCH_BASE + 9)
{"mips32r2", no_argument, NULL, OPTION_MIPS32R2},
#define OPTION_MIPS64R2 (OPTION_ARCH_BASE + 10)
{"mips64r2", no_argument, NULL, OPTION_MIPS64R2},
/* Options which specify Application Specific Extensions (ASEs). */
#define OPTION_ASE_BASE (OPTION_ARCH_BASE + 11)
#define OPTION_MIPS16 (OPTION_ASE_BASE + 0)
{"mips16", no_argument, NULL, OPTION_MIPS16},
#define OPTION_NO_MIPS16 (OPTION_ASE_BASE + 1)
{"no-mips16", no_argument, NULL, OPTION_NO_MIPS16},
#define OPTION_MIPS3D (OPTION_ASE_BASE + 2)
{"mips3d", no_argument, NULL, OPTION_MIPS3D},
#define OPTION_NO_MIPS3D (OPTION_ASE_BASE + 3)
{"no-mips3d", no_argument, NULL, OPTION_NO_MIPS3D},
#define OPTION_MDMX (OPTION_ASE_BASE + 4)
{"mdmx", no_argument, NULL, OPTION_MDMX},
#define OPTION_NO_MDMX (OPTION_ASE_BASE + 5)
{"no-mdmx", no_argument, NULL, OPTION_NO_MDMX},
/* Old-style architecture options. Don't add more of these. */
#define OPTION_COMPAT_ARCH_BASE (OPTION_ASE_BASE + 6)
#define OPTION_M4650 (OPTION_COMPAT_ARCH_BASE + 0)
{"m4650", no_argument, NULL, OPTION_M4650},
#define OPTION_NO_M4650 (OPTION_COMPAT_ARCH_BASE + 1)
{"no-m4650", no_argument, NULL, OPTION_NO_M4650},
#define OPTION_M4010 (OPTION_COMPAT_ARCH_BASE + 2)
{"m4010", no_argument, NULL, OPTION_M4010},
#define OPTION_NO_M4010 (OPTION_COMPAT_ARCH_BASE + 3)
{"no-m4010", no_argument, NULL, OPTION_NO_M4010},
#define OPTION_M4100 (OPTION_COMPAT_ARCH_BASE + 4)
{"m4100", no_argument, NULL, OPTION_M4100},
#define OPTION_NO_M4100 (OPTION_COMPAT_ARCH_BASE + 5)
{"no-m4100", no_argument, NULL, OPTION_NO_M4100},
#define OPTION_M3900 (OPTION_COMPAT_ARCH_BASE + 6)
{"m3900", no_argument, NULL, OPTION_M3900},
#define OPTION_NO_M3900 (OPTION_COMPAT_ARCH_BASE + 7)
{"no-m3900", no_argument, NULL, OPTION_NO_M3900},
/* Options which enable bug fixes. */
#define OPTION_FIX_BASE (OPTION_COMPAT_ARCH_BASE + 8)
#define OPTION_M7000_HILO_FIX (OPTION_FIX_BASE + 0)
{"mfix7000", no_argument, NULL, OPTION_M7000_HILO_FIX},
#define OPTION_MNO_7000_HILO_FIX (OPTION_FIX_BASE + 1)
{"no-fix-7000", no_argument, NULL, OPTION_MNO_7000_HILO_FIX},
{"mno-fix7000", no_argument, NULL, OPTION_MNO_7000_HILO_FIX},
#define OPTION_FIX_VR4120 (OPTION_FIX_BASE + 2)
#define OPTION_NO_FIX_VR4120 (OPTION_FIX_BASE + 3)
{"mfix-vr4120", no_argument, NULL, OPTION_FIX_VR4120},
{"mno-fix-vr4120", no_argument, NULL, OPTION_NO_FIX_VR4120},
/* Miscellaneous options. */
#define OPTION_MISC_BASE (OPTION_FIX_BASE + 4)
#define OPTION_TRAP (OPTION_MISC_BASE + 0)
{"trap", no_argument, NULL, OPTION_TRAP},
{"no-break", no_argument, NULL, OPTION_TRAP},
#define OPTION_BREAK (OPTION_MISC_BASE + 1)
{"break", no_argument, NULL, OPTION_BREAK},
{"no-trap", no_argument, NULL, OPTION_BREAK},
#define OPTION_EB (OPTION_MISC_BASE + 2)
{"EB", no_argument, NULL, OPTION_EB},
#define OPTION_EL (OPTION_MISC_BASE + 3)
{"EL", no_argument, NULL, OPTION_EL},
#define OPTION_FP32 (OPTION_MISC_BASE + 4)
{"mfp32", no_argument, NULL, OPTION_FP32},
#define OPTION_GP32 (OPTION_MISC_BASE + 5)
{"mgp32", no_argument, NULL, OPTION_GP32},
#define OPTION_CONSTRUCT_FLOATS (OPTION_MISC_BASE + 6)
{"construct-floats", no_argument, NULL, OPTION_CONSTRUCT_FLOATS},
#define OPTION_NO_CONSTRUCT_FLOATS (OPTION_MISC_BASE + 7)
{"no-construct-floats", no_argument, NULL, OPTION_NO_CONSTRUCT_FLOATS},
#define OPTION_FP64 (OPTION_MISC_BASE + 8)
{"mfp64", no_argument, NULL, OPTION_FP64},
#define OPTION_GP64 (OPTION_MISC_BASE + 9)
{"mgp64", no_argument, NULL, OPTION_GP64},
#define OPTION_RELAX_BRANCH (OPTION_MISC_BASE + 10)
#define OPTION_NO_RELAX_BRANCH (OPTION_MISC_BASE + 11)
{"relax-branch", no_argument, NULL, OPTION_RELAX_BRANCH},
{"no-relax-branch", no_argument, NULL, OPTION_NO_RELAX_BRANCH},
/* ELF-specific options. */
#ifdef OBJ_ELF
#define OPTION_ELF_BASE (OPTION_MISC_BASE + 12)
#define OPTION_CALL_SHARED (OPTION_ELF_BASE + 0)
{"KPIC", no_argument, NULL, OPTION_CALL_SHARED},
{"call_shared", no_argument, NULL, OPTION_CALL_SHARED},
#define OPTION_NON_SHARED (OPTION_ELF_BASE + 1)
{"non_shared", no_argument, NULL, OPTION_NON_SHARED},
#define OPTION_XGOT (OPTION_ELF_BASE + 2)
{"xgot", no_argument, NULL, OPTION_XGOT},
#define OPTION_MABI (OPTION_ELF_BASE + 3)
{"mabi", required_argument, NULL, OPTION_MABI},
#define OPTION_32 (OPTION_ELF_BASE + 4)
{"32", no_argument, NULL, OPTION_32},
#define OPTION_N32 (OPTION_ELF_BASE + 5)
{"n32", no_argument, NULL, OPTION_N32},
#define OPTION_64 (OPTION_ELF_BASE + 6)
{"64", no_argument, NULL, OPTION_64},
#define OPTION_MDEBUG (OPTION_ELF_BASE + 7)
{"mdebug", no_argument, NULL, OPTION_MDEBUG},
#define OPTION_NO_MDEBUG (OPTION_ELF_BASE + 8)
{"no-mdebug", no_argument, NULL, OPTION_NO_MDEBUG},
#define OPTION_PDR (OPTION_ELF_BASE + 9)
{"mpdr", no_argument, NULL, OPTION_PDR},
#define OPTION_NO_PDR (OPTION_ELF_BASE + 10)
{"mno-pdr", no_argument, NULL, OPTION_NO_PDR},
#endif /* OBJ_ELF */
{NULL, no_argument, NULL, 0}
};
size_t md_longopts_size = sizeof (md_longopts);
/* Set STRING_PTR (either &mips_arch_string or &mips_tune_string) to
NEW_VALUE. Warn if another value was already specified. Note:
we have to defer parsing the -march and -mtune arguments in order
to handle 'from-abi' correctly, since the ABI might be specified
in a later argument. */
static void
mips_set_option_string (const char **string_ptr, const char *new_value)
{
if (*string_ptr != 0 && strcasecmp (*string_ptr, new_value) != 0)
as_warn (_("A different %s was already specified, is now %s"),
string_ptr == &mips_arch_string ? "-march" : "-mtune",
new_value);
*string_ptr = new_value;
}
int
md_parse_option (int c, char *arg)
{
switch (c)
{
case OPTION_CONSTRUCT_FLOATS:
mips_disable_float_construction = 0;
break;
case OPTION_NO_CONSTRUCT_FLOATS:
mips_disable_float_construction = 1;
break;
case OPTION_TRAP:
mips_trap = 1;
break;
case OPTION_BREAK:
mips_trap = 0;
break;
case OPTION_EB:
target_big_endian = 1;
break;
case OPTION_EL:
target_big_endian = 0;
break;
case 'O':
if (arg && arg[1] == '0')
mips_optimize = 1;
else
mips_optimize = 2;
break;
case 'g':
if (arg == NULL)
mips_debug = 2;
else
mips_debug = atoi (arg);
/* When the MIPS assembler sees -g or -g2, it does not do
optimizations which limit full symbolic debugging. We take
that to be equivalent to -O0. */
if (mips_debug == 2)
mips_optimize = 1;
break;
case OPTION_MIPS1:
file_mips_isa = ISA_MIPS1;
break;
case OPTION_MIPS2:
file_mips_isa = ISA_MIPS2;
break;
case OPTION_MIPS3:
file_mips_isa = ISA_MIPS3;
break;
case OPTION_MIPS4:
file_mips_isa = ISA_MIPS4;
break;
case OPTION_MIPS5:
file_mips_isa = ISA_MIPS5;
break;
case OPTION_MIPS32:
file_mips_isa = ISA_MIPS32;
break;
case OPTION_MIPS32R2:
file_mips_isa = ISA_MIPS32R2;
break;
case OPTION_MIPS64R2:
file_mips_isa = ISA_MIPS64R2;
break;
case OPTION_MIPS64:
file_mips_isa = ISA_MIPS64;
break;
case OPTION_MTUNE:
mips_set_option_string (&mips_tune_string, arg);
break;
case OPTION_MARCH:
mips_set_option_string (&mips_arch_string, arg);
break;
case OPTION_M4650:
mips_set_option_string (&mips_arch_string, "4650");
mips_set_option_string (&mips_tune_string, "4650");
break;
case OPTION_NO_M4650:
break;
case OPTION_M4010:
mips_set_option_string (&mips_arch_string, "4010");
mips_set_option_string (&mips_tune_string, "4010");
break;
case OPTION_NO_M4010:
break;
case OPTION_M4100:
mips_set_option_string (&mips_arch_string, "4100");
mips_set_option_string (&mips_tune_string, "4100");
break;
case OPTION_NO_M4100:
break;
case OPTION_M3900:
mips_set_option_string (&mips_arch_string, "3900");
mips_set_option_string (&mips_tune_string, "3900");
break;
case OPTION_NO_M3900:
break;
case OPTION_MDMX:
mips_opts.ase_mdmx = 1;
break;
case OPTION_NO_MDMX:
mips_opts.ase_mdmx = 0;
break;
case OPTION_MIPS16:
mips_opts.mips16 = 1;
mips_no_prev_insn (FALSE);
break;
case OPTION_NO_MIPS16:
mips_opts.mips16 = 0;
mips_no_prev_insn (FALSE);
break;
case OPTION_MIPS3D:
mips_opts.ase_mips3d = 1;
break;
case OPTION_NO_MIPS3D:
mips_opts.ase_mips3d = 0;
break;
case OPTION_FIX_VR4120:
mips_fix_vr4120 = 1;
break;
case OPTION_NO_FIX_VR4120:
mips_fix_vr4120 = 0;
break;
case OPTION_RELAX_BRANCH:
mips_relax_branch = 1;
break;
case OPTION_NO_RELAX_BRANCH:
mips_relax_branch = 0;
break;
#ifdef OBJ_ELF
/* When generating ELF code, we permit -KPIC and -call_shared to
select SVR4_PIC, and -non_shared to select no PIC. This is
intended to be compatible with Irix 5. */
case OPTION_CALL_SHARED:
if (OUTPUT_FLAVOR != bfd_target_elf_flavour)
{
as_bad (_("-call_shared is supported only for ELF format"));
return 0;
}
mips_pic = SVR4_PIC;
mips_abicalls = TRUE;
if (g_switch_seen && g_switch_value != 0)
{
as_bad (_("-G may not be used with SVR4 PIC code"));
return 0;
}
g_switch_value = 0;
break;
case OPTION_NON_SHARED:
if (OUTPUT_FLAVOR != bfd_target_elf_flavour)
{
as_bad (_("-non_shared is supported only for ELF format"));
return 0;
}
mips_pic = NO_PIC;
mips_abicalls = FALSE;
break;
/* The -xgot option tells the assembler to use 32 offsets when
accessing the got in SVR4_PIC mode. It is for Irix
compatibility. */
case OPTION_XGOT:
mips_big_got = 1;
break;
#endif /* OBJ_ELF */
case 'G':
if (mips_pic == SVR4_PIC)
{
as_bad (_("-G may not be used with SVR4 PIC code"));
return 0;
}
else
g_switch_value = atoi (arg);
g_switch_seen = 1;
break;
#ifdef OBJ_ELF
/* The -32, -n32 and -64 options are shortcuts for -mabi=32, -mabi=n32
and -mabi=64. */
case OPTION_32:
if (OUTPUT_FLAVOR != bfd_target_elf_flavour)
{
as_bad (_("-32 is supported for ELF format only"));
return 0;
}
mips_abi = O32_ABI;
break;
case OPTION_N32:
if (OUTPUT_FLAVOR != bfd_target_elf_flavour)
{
as_bad (_("-n32 is supported for ELF format only"));
return 0;
}
mips_abi = N32_ABI;
break;
case OPTION_64:
if (OUTPUT_FLAVOR != bfd_target_elf_flavour)
{
as_bad (_("-64 is supported for ELF format only"));
return 0;
}
mips_abi = N64_ABI;
if (! support_64bit_objects())
as_fatal (_("No compiled in support for 64 bit object file format"));
break;
#endif /* OBJ_ELF */
case OPTION_GP32:
file_mips_gp32 = 1;
break;
case OPTION_GP64:
file_mips_gp32 = 0;
break;
case OPTION_FP32:
file_mips_fp32 = 1;
break;
case OPTION_FP64:
file_mips_fp32 = 0;
break;
#ifdef OBJ_ELF
case OPTION_MABI:
if (OUTPUT_FLAVOR != bfd_target_elf_flavour)
{
as_bad (_("-mabi is supported for ELF format only"));
return 0;
}
if (strcmp (arg, "32") == 0)
mips_abi = O32_ABI;
else if (strcmp (arg, "o64") == 0)
mips_abi = O64_ABI;
else if (strcmp (arg, "n32") == 0)
mips_abi = N32_ABI;
else if (strcmp (arg, "64") == 0)
{
mips_abi = N64_ABI;
if (! support_64bit_objects())
as_fatal (_("No compiled in support for 64 bit object file "
"format"));
}
else if (strcmp (arg, "eabi") == 0)
mips_abi = EABI_ABI;
else
{
as_fatal (_("invalid abi -mabi=%s"), arg);
return 0;
}
break;
#endif /* OBJ_ELF */
case OPTION_M7000_HILO_FIX:
mips_7000_hilo_fix = TRUE;
break;
case OPTION_MNO_7000_HILO_FIX:
mips_7000_hilo_fix = FALSE;
break;
#ifdef OBJ_ELF
case OPTION_MDEBUG:
mips_flag_mdebug = TRUE;
break;
case OPTION_NO_MDEBUG:
mips_flag_mdebug = FALSE;
break;
case OPTION_PDR:
mips_flag_pdr = TRUE;
break;
case OPTION_NO_PDR:
mips_flag_pdr = FALSE;
break;
#endif /* OBJ_ELF */
default:
return 0;
}
return 1;
}
/* Set up globals to generate code for the ISA or processor
described by INFO. */
static void
mips_set_architecture (const struct mips_cpu_info *info)
{
if (info != 0)
{
file_mips_arch = info->cpu;
mips_opts.arch = info->cpu;
mips_opts.isa = info->isa;
}
}
/* Likewise for tuning. */
static void
mips_set_tune (const struct mips_cpu_info *info)
{
if (info != 0)
mips_tune = info->cpu;
}
void
mips_after_parse_args (void)
{
const struct mips_cpu_info *arch_info = 0;
const struct mips_cpu_info *tune_info = 0;
/* GP relative stuff not working for PE */
if (strncmp (TARGET_OS, "pe", 2) == 0
&& g_switch_value != 0)
{
if (g_switch_seen)
as_bad (_("-G not supported in this configuration."));
g_switch_value = 0;
}
if (mips_abi == NO_ABI)
mips_abi = MIPS_DEFAULT_ABI;
/* The following code determines the architecture and register size.
Similar code was added to GCC 3.3 (see override_options() in
config/mips/mips.c). The GAS and GCC code should be kept in sync
as much as possible. */
if (mips_arch_string != 0)
arch_info = mips_parse_cpu ("-march", mips_arch_string);
if (file_mips_isa != ISA_UNKNOWN)
{
/* Handle -mipsN. At this point, file_mips_isa contains the
ISA level specified by -mipsN, while arch_info->isa contains
the -march selection (if any). */
if (arch_info != 0)
{
/* -march takes precedence over -mipsN, since it is more descriptive.
There's no harm in specifying both as long as the ISA levels
are the same. */
if (file_mips_isa != arch_info->isa)
as_bad (_("-%s conflicts with the other architecture options, which imply -%s"),
mips_cpu_info_from_isa (file_mips_isa)->name,
mips_cpu_info_from_isa (arch_info->isa)->name);
}
else
arch_info = mips_cpu_info_from_isa (file_mips_isa);
}
if (arch_info == 0)
arch_info = mips_parse_cpu ("default CPU", MIPS_CPU_STRING_DEFAULT);
if (ABI_NEEDS_64BIT_REGS (mips_abi) && !ISA_HAS_64BIT_REGS (arch_info->isa))
as_bad ("-march=%s is not compatible with the selected ABI",
arch_info->name);
mips_set_architecture (arch_info);
/* Optimize for file_mips_arch, unless -mtune selects a different processor. */
if (mips_tune_string != 0)
tune_info = mips_parse_cpu ("-mtune", mips_tune_string);
if (tune_info == 0)
mips_set_tune (arch_info);
else
mips_set_tune (tune_info);
if (file_mips_gp32 >= 0)
{
/* The user specified the size of the integer registers. Make sure
it agrees with the ABI and ISA. */
if (file_mips_gp32 == 0 && !ISA_HAS_64BIT_REGS (mips_opts.isa))
as_bad (_("-mgp64 used with a 32-bit processor"));
else if (file_mips_gp32 == 1 && ABI_NEEDS_64BIT_REGS (mips_abi))
as_bad (_("-mgp32 used with a 64-bit ABI"));
else if (file_mips_gp32 == 0 && ABI_NEEDS_32BIT_REGS (mips_abi))
as_bad (_("-mgp64 used with a 32-bit ABI"));
}
else
{
/* Infer the integer register size from the ABI and processor.
Restrict ourselves to 32-bit registers if that's all the
processor has, or if the ABI cannot handle 64-bit registers. */
file_mips_gp32 = (ABI_NEEDS_32BIT_REGS (mips_abi)
|| !ISA_HAS_64BIT_REGS (mips_opts.isa));
}
/* ??? GAS treats single-float processors as though they had 64-bit
float registers (although it complains when double-precision
instructions are used). As things stand, saying they have 32-bit
registers would lead to spurious "register must be even" messages.
So here we assume float registers are always the same size as
integer ones, unless the user says otherwise. */
if (file_mips_fp32 < 0)
file_mips_fp32 = file_mips_gp32;
/* End of GCC-shared inference code. */
/* This flag is set when we have a 64-bit capable CPU but use only
32-bit wide registers. Note that EABI does not use it. */
if (ISA_HAS_64BIT_REGS (mips_opts.isa)
&& ((mips_abi == NO_ABI && file_mips_gp32 == 1)
|| mips_abi == O32_ABI))
mips_32bitmode = 1;
if (mips_opts.isa == ISA_MIPS1 && mips_trap)
as_bad (_("trap exception not supported at ISA 1"));
/* If the selected architecture includes support for ASEs, enable
generation of code for them. */
if (mips_opts.mips16 == -1)
mips_opts.mips16 = (CPU_HAS_MIPS16 (file_mips_arch)) ? 1 : 0;
if (mips_opts.ase_mips3d == -1)
mips_opts.ase_mips3d = (CPU_HAS_MIPS3D (file_mips_arch)) ? 1 : 0;
if (mips_opts.ase_mdmx == -1)
mips_opts.ase_mdmx = (CPU_HAS_MDMX (file_mips_arch)) ? 1 : 0;
file_mips_isa = mips_opts.isa;
file_ase_mips16 = mips_opts.mips16;
file_ase_mips3d = mips_opts.ase_mips3d;
file_ase_mdmx = mips_opts.ase_mdmx;
mips_opts.gp32 = file_mips_gp32;
mips_opts.fp32 = file_mips_fp32;
if (mips_flag_mdebug < 0)
{
#ifdef OBJ_MAYBE_ECOFF
if (OUTPUT_FLAVOR == bfd_target_ecoff_flavour)
mips_flag_mdebug = 1;
else
#endif /* OBJ_MAYBE_ECOFF */
mips_flag_mdebug = 0;
}
}
void
mips_init_after_args (void)
{
/* initialize opcodes */
bfd_mips_num_opcodes = bfd_mips_num_builtin_opcodes;
mips_opcodes = (struct mips_opcode *) mips_builtin_opcodes;
}
long
md_pcrel_from (fixS *fixP)
{
valueT addr = fixP->fx_where + fixP->fx_frag->fr_address;
switch (fixP->fx_r_type)
{
case BFD_RELOC_16_PCREL_S2:
case BFD_RELOC_MIPS_JMP:
/* Return the address of the delay slot. */
return addr + 4;
default:
return addr;
}
}
/* This is called before the symbol table is processed. In order to
work with gcc when using mips-tfile, we must keep all local labels.
However, in other cases, we want to discard them. If we were
called with -g, but we didn't see any debugging information, it may
mean that gcc is smuggling debugging information through to
mips-tfile, in which case we must generate all local labels. */
void
mips_frob_file_before_adjust (void)
{
#ifndef NO_ECOFF_DEBUGGING
if (ECOFF_DEBUGGING
&& mips_debug != 0
&& ! ecoff_debugging_seen)
flag_keep_locals = 1;
#endif
}
/* Sort any unmatched HI16_S relocs so that they immediately precede
the corresponding LO reloc. This is called before md_apply_fix3 and
tc_gen_reloc. Unmatched HI16_S relocs can only be generated by
explicit use of the %hi modifier. */
void
mips_frob_file (void)
{
struct mips_hi_fixup *l;
for (l = mips_hi_fixup_list; l != NULL; l = l->next)
{
segment_info_type *seginfo;
int pass;
assert (reloc_needs_lo_p (l->fixp->fx_r_type));
/* If a GOT16 relocation turns out to be against a global symbol,
there isn't supposed to be a matching LO. */
if (l->fixp->fx_r_type == BFD_RELOC_MIPS_GOT16
&& !pic_need_relax (l->fixp->fx_addsy, l->seg))
continue;
/* Check quickly whether the next fixup happens to be a matching %lo. */
if (fixup_has_matching_lo_p (l->fixp))
continue;
/* Look through the fixups for this segment for a matching %lo.
When we find one, move the %hi just in front of it. We do
this in two passes. In the first pass, we try to find a
unique %lo. In the second pass, we permit multiple %hi
relocs for a single %lo (this is a GNU extension). */
seginfo = seg_info (l->seg);
for (pass = 0; pass < 2; pass++)
{
fixS *f, *prev;
prev = NULL;
for (f = seginfo->fix_root; f != NULL; f = f->fx_next)
{
/* Check whether this is a %lo fixup which matches l->fixp. */
if (f->fx_r_type == BFD_RELOC_LO16
&& f->fx_addsy == l->fixp->fx_addsy
&& f->fx_offset == l->fixp->fx_offset
&& (pass == 1
|| prev == NULL
|| !reloc_needs_lo_p (prev->fx_r_type)
|| !fixup_has_matching_lo_p (prev)))
{
fixS **pf;
/* Move l->fixp before f. */
for (pf = &seginfo->fix_root;
*pf != l->fixp;
pf = &(*pf)->fx_next)
assert (*pf != NULL);
*pf = l->fixp->fx_next;
l->fixp->fx_next = f;
if (prev == NULL)
seginfo->fix_root = l->fixp;
else
prev->fx_next = l->fixp;
break;
}
prev = f;
}
if (f != NULL)
break;
#if 0 /* GCC code motion plus incomplete dead code elimination
can leave a %hi without a %lo. */
if (pass == 1)
as_warn_where (l->fixp->fx_file, l->fixp->fx_line,
_("Unmatched %%hi reloc"));
#endif
}
}
}
/* We may have combined relocations without symbols in the N32/N64 ABI.
We have to prevent gas from dropping them. */
int
mips_force_relocation (fixS *fixp)
{
if (generic_force_reloc (fixp))
return 1;
if (HAVE_NEWABI
&& S_GET_SEGMENT (fixp->fx_addsy) == bfd_abs_section_ptr
&& (fixp->fx_r_type == BFD_RELOC_MIPS_SUB
|| fixp->fx_r_type == BFD_RELOC_HI16_S
|| fixp->fx_r_type == BFD_RELOC_LO16))
return 1;
return 0;
}
/* This hook is called before a fix is simplified. We don't really
decide whether to skip a fix here. Rather, we turn global symbols
used as branch targets into local symbols, such that they undergo
simplification. We can only do this if the symbol is defined and
it is in the same section as the branch. If this doesn't hold, we
emit a better error message than just saying the relocation is not
valid for the selected object format.
FIXP is the fix-up we're going to try to simplify, SEG is the
segment in which the fix up occurs. The return value should be
non-zero to indicate the fix-up is valid for further
simplifications. */
int
mips_validate_fix (struct fix *fixP, asection *seg)
{
/* There's a lot of discussion on whether it should be possible to
use R_MIPS_PC16 to represent branch relocations. The outcome
seems to be that it can, but gas/bfd are very broken in creating
RELA relocations for this, so for now we only accept branches to
symbols in the same section. Anything else is of dubious value,
since there's no guarantee that at link time the symbol would be
in range. Even for branches to local symbols this is arguably
wrong, since it we assume the symbol is not going to be
overridden, which should be possible per ELF library semantics,
but then, there isn't a dynamic relocation that could be used to
this effect, and the target would likely be out of range as well.
Unfortunately, it seems that there is too much code out there
that relies on branches to symbols that are global to be resolved
as if they were local, like the IRIX tools do, so we do it as
well, but with a warning so that people are reminded to fix their
code. If we ever get back to using R_MIPS_PC16 for branch
targets, this entire block should go away (and probably the
whole function). */
if (fixP->fx_r_type == BFD_RELOC_16_PCREL_S2
&& ((OUTPUT_FLAVOR == bfd_target_ecoff_flavour
|| OUTPUT_FLAVOR == bfd_target_elf_flavour)
|| bfd_reloc_type_lookup (stdoutput, BFD_RELOC_16_PCREL_S2) == NULL)
&& fixP->fx_addsy)
{
if (! S_IS_DEFINED (fixP->fx_addsy))
{
as_bad_where (fixP->fx_file, fixP->fx_line,
_("Cannot branch to undefined symbol."));
/* Avoid any further errors about this fixup. */
fixP->fx_done = 1;
}
else if (S_GET_SEGMENT (fixP->fx_addsy) != seg)
{
as_bad_where (fixP->fx_file, fixP->fx_line,
_("Cannot branch to symbol in another section."));
fixP->fx_done = 1;
}
else if (S_IS_EXTERNAL (fixP->fx_addsy))
{
symbolS *sym = fixP->fx_addsy;
if (mips_pic == SVR4_PIC)
as_warn_where (fixP->fx_file, fixP->fx_line,
_("Pretending global symbol used as branch target is local."));
fixP->fx_addsy = symbol_create (S_GET_NAME (sym),
S_GET_SEGMENT (sym),
S_GET_VALUE (sym),
symbol_get_frag (sym));
copy_symbol_attributes (fixP->fx_addsy, sym);
S_CLEAR_EXTERNAL (fixP->fx_addsy);
assert (symbol_resolved_p (sym));
symbol_mark_resolved (fixP->fx_addsy);
}
}
return 1;
}
/* Apply a fixup to the object file. */
void
md_apply_fix3 (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED)
{
bfd_byte *buf;
long insn;
static int previous_fx_r_type = 0;
reloc_howto_type *howto;
/* We ignore generic BFD relocations we don't know about. */
howto = bfd_reloc_type_lookup (stdoutput, fixP->fx_r_type);
if (! howto)
return;
assert (fixP->fx_size == 4
|| fixP->fx_r_type == BFD_RELOC_16
|| fixP->fx_r_type == BFD_RELOC_64
|| fixP->fx_r_type == BFD_RELOC_CTOR
|| fixP->fx_r_type == BFD_RELOC_MIPS_SUB
|| fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT
|| fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY);
buf = (bfd_byte *) (fixP->fx_frag->fr_literal + fixP->fx_where);
/* We are not done if this is a composite relocation to set up gp. */
assert (! fixP->fx_pcrel);
if (fixP->fx_addsy == NULL
&& !(fixP->fx_r_type == BFD_RELOC_MIPS_SUB
|| (fixP->fx_r_type == BFD_RELOC_64
&& (previous_fx_r_type == BFD_RELOC_GPREL32
|| previous_fx_r_type == BFD_RELOC_GPREL16))
|| (previous_fx_r_type == BFD_RELOC_MIPS_SUB
&& (fixP->fx_r_type == BFD_RELOC_HI16_S
|| fixP->fx_r_type == BFD_RELOC_LO16))))
fixP->fx_done = 1;
previous_fx_r_type = fixP->fx_r_type;
switch (fixP->fx_r_type)
{
case BFD_RELOC_MIPS_JMP:
case BFD_RELOC_MIPS_SHIFT5:
case BFD_RELOC_MIPS_SHIFT6:
case BFD_RELOC_MIPS_GOT_DISP:
case BFD_RELOC_MIPS_GOT_PAGE:
case BFD_RELOC_MIPS_GOT_OFST:
case BFD_RELOC_MIPS_SUB:
case BFD_RELOC_MIPS_INSERT_A:
case BFD_RELOC_MIPS_INSERT_B:
case BFD_RELOC_MIPS_DELETE:
case BFD_RELOC_MIPS_HIGHEST:
case BFD_RELOC_MIPS_HIGHER:
case BFD_RELOC_MIPS_SCN_DISP:
case BFD_RELOC_MIPS_REL16:
case BFD_RELOC_MIPS_RELGOT:
case BFD_RELOC_MIPS_JALR:
case BFD_RELOC_HI16:
case BFD_RELOC_HI16_S:
case BFD_RELOC_GPREL16:
case BFD_RELOC_MIPS_LITERAL:
case BFD_RELOC_MIPS_CALL16:
case BFD_RELOC_MIPS_GOT16:
case BFD_RELOC_GPREL32:
case BFD_RELOC_MIPS_GOT_HI16:
case BFD_RELOC_MIPS_GOT_LO16:
case BFD_RELOC_MIPS_CALL_HI16:
case BFD_RELOC_MIPS_CALL_LO16:
case BFD_RELOC_MIPS16_GPREL:
assert (! fixP->fx_pcrel);
/* Nothing needed to do. The value comes from the reloc entry */
break;
case BFD_RELOC_MIPS16_JMP:
/* We currently always generate a reloc against a symbol, which
means that we don't want an addend even if the symbol is
defined. */
*valP = 0;
break;
case BFD_RELOC_64:
/* This is handled like BFD_RELOC_32, but we output a sign
extended value if we are only 32 bits. */
if (fixP->fx_done)
{
if (8 <= sizeof (valueT))
md_number_to_chars (buf, *valP, 8);
else
{
valueT hiv;
if ((*valP & 0x80000000) != 0)
hiv = 0xffffffff;
else
hiv = 0;
md_number_to_chars ((char *)(buf + target_big_endian ? 4 : 0),
*valP, 4);
md_number_to_chars ((char *)(buf + target_big_endian ? 0 : 4),
hiv, 4);
}
}
break;
case BFD_RELOC_RVA:
case BFD_RELOC_32:
/* If we are deleting this reloc entry, we must fill in the
value now. This can happen if we have a .word which is not
resolved when it appears but is later defined. */
if (fixP->fx_done)
md_number_to_chars (buf, *valP, 4);
break;
case BFD_RELOC_16:
/* If we are deleting this reloc entry, we must fill in the
value now. */
assert (fixP->fx_size == 2);
if (fixP->fx_done)
md_number_to_chars (buf, *valP, 2);
break;
case BFD_RELOC_LO16:
/* FIXME: Now that embedded-PIC is gone, some of this code/comment
may be safe to remove, but if so it's not obvious. */
/* When handling an embedded PIC switch statement, we can wind
up deleting a LO16 reloc. See the 'o' case in mips_ip. */
if (fixP->fx_done)
{
if (*valP + 0x8000 > 0xffff)
as_bad_where (fixP->fx_file, fixP->fx_line,
_("relocation overflow"));
if (target_big_endian)
buf += 2;
md_number_to_chars (buf, *valP, 2);
}
break;
case BFD_RELOC_16_PCREL_S2:
if ((*valP & 0x3) != 0)
as_bad_where (fixP->fx_file, fixP->fx_line,
_("Branch to odd address (%lx)"), (long) *valP);
/*
* We need to save the bits in the instruction since fixup_segment()
* might be deleting the relocation entry (i.e., a branch within
* the current segment).
*/
if (! fixP->fx_done)
break;
/* update old instruction data */
if (target_big_endian)
insn = (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
else
insn = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
if (*valP + 0x20000 <= 0x3ffff)
{
insn |= (*valP >> 2) & 0xffff;
md_number_to_chars (buf, insn, 4);
}
else if (mips_pic == NO_PIC
&& fixP->fx_done
&& fixP->fx_frag->fr_address >= text_section->vma
&& (fixP->fx_frag->fr_address
< text_section->vma + text_section->_raw_size)
&& ((insn & 0xffff0000) == 0x10000000 /* beq $0,$0 */
|| (insn & 0xffff0000) == 0x04010000 /* bgez $0 */
|| (insn & 0xffff0000) == 0x04110000)) /* bgezal $0 */
{
/* The branch offset is too large. If this is an
unconditional branch, and we are not generating PIC code,
we can convert it to an absolute jump instruction. */
if ((insn & 0xffff0000) == 0x04110000) /* bgezal $0 */
insn = 0x0c000000; /* jal */
else
insn = 0x08000000; /* j */
fixP->fx_r_type = BFD_RELOC_MIPS_JMP;
fixP->fx_done = 0;
fixP->fx_addsy = section_symbol (text_section);
*valP += md_pcrel_from (fixP);
md_number_to_chars (buf, insn, 4);
}
else
{
/* If we got here, we have branch-relaxation disabled,
and there's nothing we can do to fix this instruction
without turning it into a longer sequence. */
as_bad_where (fixP->fx_file, fixP->fx_line,
_("Branch out of range"));
}
break;
case BFD_RELOC_VTABLE_INHERIT:
fixP->fx_done = 0;
if (fixP->fx_addsy
&& !S_IS_DEFINED (fixP->fx_addsy)
&& !S_IS_WEAK (fixP->fx_addsy))
S_SET_WEAK (fixP->fx_addsy);
break;
case BFD_RELOC_VTABLE_ENTRY:
fixP->fx_done = 0;
break;
default:
internalError ();
}
/* Remember value for tc_gen_reloc. */
fixP->fx_addnumber = *valP;
}
#if 0
void
printInsn (unsigned long oc)
{
const struct mips_opcode *p;
int treg, sreg, dreg, shamt;
short imm;
const char *args;
int i;
for (i = 0; i < NUMOPCODES; ++i)
{
p = &mips_opcodes[i];
if (((oc & p->mask) == p->match) && (p->pinfo != INSN_MACRO))
{
printf ("%08lx %s\t", oc, p->name);
treg = (oc >> 16) & 0x1f;
sreg = (oc >> 21) & 0x1f;
dreg = (oc >> 11) & 0x1f;
shamt = (oc >> 6) & 0x1f;
imm = oc;
for (args = p->args;; ++args)
{
switch (*args)
{
case '\0':
printf ("\n");
break;
case ',':
case '(':
case ')':
printf ("%c", *args);
continue;
case 'r':
assert (treg == sreg);
printf ("$%d,$%d", treg, sreg);
continue;
case 'd':
case 'G':
printf ("$%d", dreg);
continue;
case 't':
case 'E':
printf ("$%d", treg);
continue;
case 'k':
printf ("0x%x", treg);
continue;
case 'b':
case 's':
printf ("$%d", sreg);
continue;
case 'a':
printf ("0x%08lx", oc & 0x1ffffff);
continue;
case 'i':
case 'j':
case 'o':
case 'u':
printf ("%d", imm);
continue;
case '<':
case '>':
printf ("$%d", shamt);
continue;
default:
internalError ();
}
break;
}
return;
}
}
printf (_("%08lx UNDEFINED\n"), oc);
}
#endif
static symbolS *
get_symbol (void)
{
int c;
char *name;
symbolS *p;
name = input_line_pointer;
c = get_symbol_end ();
p = (symbolS *) symbol_find_or_make (name);
*input_line_pointer = c;
return p;
}
/* Align the current frag to a given power of two. The MIPS assembler
also automatically adjusts any preceding label. */
static void
mips_align (int to, int fill, symbolS *label)
{
mips_emit_delays (FALSE);
frag_align (to, fill, 0);
record_alignment (now_seg, to);
if (label != NULL)
{
assert (S_GET_SEGMENT (label) == now_seg);
symbol_set_frag (label, frag_now);
S_SET_VALUE (label, (valueT) frag_now_fix ());
}
}
/* Align to a given power of two. .align 0 turns off the automatic
alignment used by the data creating pseudo-ops. */
static void
s_align (int x ATTRIBUTE_UNUSED)
{
register int temp;
register long temp_fill;
long max_alignment = 15;
/*
o Note that the assembler pulls down any immediately preceding label
to the aligned address.
o It's not documented but auto alignment is reinstated by
a .align pseudo instruction.
o Note also that after auto alignment is turned off the mips assembler
issues an error on attempt to assemble an improperly aligned data item.
We don't.
*/
temp = get_absolute_expression ();
if (temp > max_alignment)
as_bad (_("Alignment too large: %d. assumed."), temp = max_alignment);
else if (temp < 0)
{
as_warn (_("Alignment negative: 0 assumed."));
temp = 0;
}
if (*input_line_pointer == ',')
{
++input_line_pointer;
temp_fill = get_absolute_expression ();
}
else
temp_fill = 0;
if (temp)
{
auto_align = 1;
mips_align (temp, (int) temp_fill,
insn_labels != NULL ? insn_labels->label : NULL);
}
else
{
auto_align = 0;
}
demand_empty_rest_of_line ();
}
void
mips_flush_pending_output (void)
{
mips_emit_delays (FALSE);
mips_clear_insn_labels ();
}
static void
s_change_sec (int sec)
{
segT seg;
#ifdef OBJ_ELF
/* The ELF backend needs to know that we are changing sections, so
that .previous works correctly. We could do something like check
for an obj_section_change_hook macro, but that might be confusing
as it would not be appropriate to use it in the section changing
functions in read.c, since obj-elf.c intercepts those. FIXME:
This should be cleaner, somehow. */
obj_elf_section_change_hook ();
#endif
mips_emit_delays (FALSE);
switch (sec)
{
case 't':
s_text (0);
break;
case 'd':
s_data (0);
break;
case 'b':
subseg_set (bss_section, (subsegT) get_absolute_expression ());
demand_empty_rest_of_line ();
break;
case 'r':
seg = subseg_new (RDATA_SECTION_NAME,
(subsegT) get_absolute_expression ());
if (OUTPUT_FLAVOR == bfd_target_elf_flavour)
{
bfd_set_section_flags (stdoutput, seg, (SEC_ALLOC | SEC_LOAD
| SEC_READONLY | SEC_RELOC
| SEC_DATA));
if (strcmp (TARGET_OS, "elf") != 0)
record_alignment (seg, 4);
}
demand_empty_rest_of_line ();
break;
case 's':
seg = subseg_new (".sdata", (subsegT) get_absolute_expression ());
if (OUTPUT_FLAVOR == bfd_target_elf_flavour)
{
bfd_set_section_flags (stdoutput, seg,
SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_DATA);
if (strcmp (TARGET_OS, "elf") != 0)
record_alignment (seg, 4);
}
demand_empty_rest_of_line ();
break;
}
auto_align = 1;
}
void
s_change_section (int ignore ATTRIBUTE_UNUSED)
{
#ifdef OBJ_ELF
char *section_name;
char c;
char next_c = 0;
int section_type;
int section_flag;
int section_entry_size;
int section_alignment;
if (OUTPUT_FLAVOR != bfd_target_elf_flavour)
return;
section_name = input_line_pointer;
c = get_symbol_end ();
if (c)
next_c = *(input_line_pointer + 1);
/* Do we have .section Name<,"flags">? */
if (c != ',' || (c == ',' && next_c == '"'))
{
/* just after name is now '\0'. */
*input_line_pointer = c;
input_line_pointer = section_name;
obj_elf_section (ignore);
return;
}
input_line_pointer++;
/* Do we have .section Name<,type><,flag><,entry_size><,alignment> */
if (c == ',')
section_type = get_absolute_expression ();
else
section_type = 0;
if (*input_line_pointer++ == ',')
section_flag = get_absolute_expression ();
else
section_flag = 0;
if (*input_line_pointer++ == ',')
section_entry_size = get_absolute_expression ();
else
section_entry_size = 0;
if (*input_line_pointer++ == ',')
section_alignment = get_absolute_expression ();
else
section_alignment = 0;
section_name = xstrdup (section_name);
/* When using the generic form of .section (as implemented by obj-elf.c),
there's no way to set the section type to SHT_MIPS_DWARF. Users have
traditionally had to fall back on the more common @progbits instead.
There's nothing really harmful in this, since bfd will correct
SHT_PROGBITS to SHT_MIPS_DWARF before writing out the file. But it
means that, for backwards compatibiltiy, the special_section entries
for dwarf sections must use SHT_PROGBITS rather than SHT_MIPS_DWARF.
Even so, we shouldn't force users of the MIPS .section syntax to
incorrectly label the sections as SHT_PROGBITS. The best compromise
seems to be to map SHT_MIPS_DWARF to SHT_PROGBITS before calling the
generic type-checking code. */
if (section_type == SHT_MIPS_DWARF)
section_type = SHT_PROGBITS;
obj_elf_change_section (section_name, section_type, section_flag,
section_entry_size, 0, 0, 0);
if (now_seg->name != section_name)
free (section_name);
#endif /* OBJ_ELF */
}
void
mips_enable_auto_align (void)
{
auto_align = 1;
}
static void
s_cons (int log_size)
{
symbolS *label;
label = insn_labels != NULL ? insn_labels->label : NULL;
mips_emit_delays (FALSE);
if (log_size > 0 && auto_align)
mips_align (log_size, 0, label);
mips_clear_insn_labels ();
cons (1 << log_size);
}
static void
s_float_cons (int type)
{
symbolS *label;
label = insn_labels != NULL ? insn_labels->label : NULL;
mips_emit_delays (FALSE);
if (auto_align)
{
if (type == 'd')
mips_align (3, 0, label);
else
mips_align (2, 0, label);
}
mips_clear_insn_labels ();
float_cons (type);
}
/* Handle .globl. We need to override it because on Irix 5 you are
permitted to say
.globl foo .text
where foo is an undefined symbol, to mean that foo should be
considered to be the address of a function. */
static void
s_mips_globl (int x ATTRIBUTE_UNUSED)
{
char *name;
int c;
symbolS *symbolP;
flagword flag;
name = input_line_pointer;
c = get_symbol_end ();
symbolP = symbol_find_or_make (name);
*input_line_pointer = c;
SKIP_WHITESPACE ();
/* On Irix 5, every global symbol that is not explicitly labelled as
being a function is apparently labelled as being an object. */
flag = BSF_OBJECT;
if (! is_end_of_line[(unsigned char) *input_line_pointer])
{
char *secname;
asection *sec;
secname = input_line_pointer;
c = get_symbol_end ();
sec = bfd_get_section_by_name (stdoutput, secname);
if (sec == NULL)
as_bad (_("%s: no such section"), secname);
*input_line_pointer = c;
if (sec != NULL && (sec->flags & SEC_CODE) != 0)
flag = BSF_FUNCTION;
}
symbol_get_bfdsym (symbolP)->flags |= flag;
S_SET_EXTERNAL (symbolP);
demand_empty_rest_of_line ();
}
static void
s_option (int x ATTRIBUTE_UNUSED)
{
char *opt;
char c;
opt = input_line_pointer;
c = get_symbol_end ();
if (*opt == 'O')
{
/* FIXME: What does this mean? */
}
else if (strncmp (opt, "pic", 3) == 0)
{
int i;
i = atoi (opt + 3);
if (i == 0)
mips_pic = NO_PIC;
else if (i == 2)
{
mips_pic = SVR4_PIC;
mips_abicalls = TRUE;
}
else
as_bad (_(".option pic%d not supported"), i);
if (mips_pic == SVR4_PIC)
{
if (g_switch_seen && g_switch_value != 0)
as_warn (_("-G may not be used with SVR4 PIC code"));
g_switch_value = 0;
bfd_set_gp_size (stdoutput, 0);
}
}
else
as_warn (_("Unrecognized option \"%s\""), opt);
*input_line_pointer = c;
demand_empty_rest_of_line ();
}
/* This structure is used to hold a stack of .set values. */
struct mips_option_stack
{
struct mips_option_stack *next;
struct mips_set_options options;
};
static struct mips_option_stack *mips_opts_stack;
/* Handle the .set pseudo-op. */
static void
s_mipsset (int x ATTRIBUTE_UNUSED)
{
char *name = input_line_pointer, ch;
while (!is_end_of_line[(unsigned char) *input_line_pointer])
++input_line_pointer;
ch = *input_line_pointer;
*input_line_pointer = '\0';
if (strcmp (name, "reorder") == 0)
{
if (mips_opts.noreorder && prev_nop_frag != NULL)
{
/* If we still have pending nops, we can discard them. The
usual nop handling will insert any that are still
needed. */
prev_nop_frag->fr_fix -= (prev_nop_frag_holds
* (mips_opts.mips16 ? 2 : 4));
prev_nop_frag = NULL;
}
mips_opts.noreorder = 0;
}
else if (strcmp (name, "noreorder") == 0)
{
mips_emit_delays (TRUE);
mips_opts.noreorder = 1;
mips_any_noreorder = 1;
}
else if (strcmp (name, "at") == 0)
{
mips_opts.noat = 0;
}
else if (strcmp (name, "noat") == 0)
{
mips_opts.noat = 1;
}
else if (strcmp (name, "macro") == 0)
{
mips_opts.warn_about_macros = 0;
}
else if (strcmp (name, "nomacro") == 0)
{
if (mips_opts.noreorder == 0)
as_bad (_("`noreorder' must be set before `nomacro'"));
mips_opts.warn_about_macros = 1;
}
else if (strcmp (name, "move") == 0 || strcmp (name, "novolatile") == 0)
{
mips_opts.nomove = 0;
}
else if (strcmp (name, "nomove") == 0 || strcmp (name, "volatile") == 0)
{
mips_opts.nomove = 1;
}
else if (strcmp (name, "bopt") == 0)
{
mips_opts.nobopt = 0;
}
else if (strcmp (name, "nobopt") == 0)
{
mips_opts.nobopt = 1;
}
else if (strcmp (name, "mips16") == 0
|| strcmp (name, "MIPS-16") == 0)
mips_opts.mips16 = 1;
else if (strcmp (name, "nomips16") == 0
|| strcmp (name, "noMIPS-16") == 0)
mips_opts.mips16 = 0;
else if (strcmp (name, "mips3d") == 0)
mips_opts.ase_mips3d = 1;
else if (strcmp (name, "nomips3d") == 0)
mips_opts.ase_mips3d = 0;
else if (strcmp (name, "mdmx") == 0)
mips_opts.ase_mdmx = 1;
else if (strcmp (name, "nomdmx") == 0)
mips_opts.ase_mdmx = 0;
else if (strncmp (name, "mips", 4) == 0 || strncmp (name, "arch=", 5) == 0)
{
int reset = 0;
/* Permit the user to change the ISA and architecture on the fly.
Needless to say, misuse can cause serious problems. */
if (strcmp (name, "mips0") == 0 || strcmp (name, "arch=default") == 0)
{
reset = 1;
mips_opts.isa = file_mips_isa;
mips_opts.arch = file_mips_arch;
}
else if (strncmp (name, "arch=", 5) == 0)
{
const struct mips_cpu_info *p;
p = mips_parse_cpu("internal use", name + 5);
if (!p)
as_bad (_("unknown architecture %s"), name + 5);
else
{
mips_opts.arch = p->cpu;
mips_opts.isa = p->isa;
}
}
else if (strncmp (name, "mips", 4) == 0)
{
const struct mips_cpu_info *p;
p = mips_parse_cpu("internal use", name);
if (!p)
as_bad (_("unknown ISA level %s"), name + 4);
else
{
mips_opts.arch = p->cpu;
mips_opts.isa = p->isa;
}
}
else
as_bad (_("unknown ISA or architecture %s"), name);
switch (mips_opts.isa)
{
case 0:
break;
case ISA_MIPS1:
case ISA_MIPS2:
case ISA_MIPS32:
case ISA_MIPS32R2:
mips_opts.gp32 = 1;
mips_opts.fp32 = 1;
break;
case ISA_MIPS3:
case ISA_MIPS4:
case ISA_MIPS5:
case ISA_MIPS64:
case ISA_MIPS64R2:
mips_opts.gp32 = 0;
mips_opts.fp32 = 0;
break;
default:
as_bad (_("unknown ISA level %s"), name + 4);
break;
}
if (reset)
{
mips_opts.gp32 = file_mips_gp32;
mips_opts.fp32 = file_mips_fp32;
}
}
else if (strcmp (name, "autoextend") == 0)
mips_opts.noautoextend = 0;
else if (strcmp (name, "noautoextend") == 0)
mips_opts.noautoextend = 1;
else if (strcmp (name, "push") == 0)
{
struct mips_option_stack *s;
s = (struct mips_option_stack *) xmalloc (sizeof *s);
s->next = mips_opts_stack;
s->options = mips_opts;
mips_opts_stack = s;
}
else if (strcmp (name, "pop") == 0)
{
struct mips_option_stack *s;
s = mips_opts_stack;
if (s == NULL)
as_bad (_(".set pop with no .set push"));
else
{
/* If we're changing the reorder mode we need to handle
delay slots correctly. */
if (s->options.noreorder && ! mips_opts.noreorder)
mips_emit_delays (TRUE);
else if (! s->options.noreorder && mips_opts.noreorder)
{
if (prev_nop_frag != NULL)
{
prev_nop_frag->fr_fix -= (prev_nop_frag_holds
* (mips_opts.mips16 ? 2 : 4));
prev_nop_frag = NULL;
}
}
mips_opts = s->options;
mips_opts_stack = s->next;
free (s);
}
}
else
{
as_warn (_("Tried to set unrecognized symbol: %s\n"), name);
}
*input_line_pointer = ch;
demand_empty_rest_of_line ();
}
/* Handle the .abicalls pseudo-op. I believe this is equivalent to
.option pic2. It means to generate SVR4 PIC calls. */
static void
s_abicalls (int ignore ATTRIBUTE_UNUSED)
{
mips_pic = SVR4_PIC;
mips_abicalls = TRUE;
if (g_switch_seen && g_switch_value != 0)
as_warn (_("-G may not be used with SVR4 PIC code"));
g_switch_value = 0;
bfd_set_gp_size (stdoutput, 0);
demand_empty_rest_of_line ();
}
/* Handle the .cpload pseudo-op. This is used when generating SVR4
PIC code. It sets the $gp register for the function based on the
function address, which is in the register named in the argument.
This uses a relocation against _gp_disp, which is handled specially
by the linker. The result is:
lui $gp,%hi(_gp_disp)
addiu $gp,$gp,%lo(_gp_disp)
addu $gp,$gp,.cpload argument
The .cpload argument is normally $25 == $t9. */
static void
s_cpload (int ignore ATTRIBUTE_UNUSED)
{
expressionS ex;
/* If we are not generating SVR4 PIC code, or if this is NewABI code,
.cpload is ignored. */
if (mips_pic != SVR4_PIC || HAVE_NEWABI)
{
s_ignore (0);
return;
}
/* .cpload should be in a .set noreorder section. */
if (mips_opts.noreorder == 0)
as_warn (_(".cpload not in noreorder section"));
ex.X_op = O_symbol;
ex.X_add_symbol = symbol_find_or_make ("_gp_disp");
ex.X_op_symbol = NULL;
ex.X_add_number = 0;
/* In ELF, this symbol is implicitly an STT_OBJECT symbol. */
symbol_get_bfdsym (ex.X_add_symbol)->flags |= BSF_OBJECT;
macro_start ();
macro_build_lui (&ex, mips_gp_register);
macro_build (&ex, "addiu", "t,r,j", mips_gp_register,
mips_gp_register, BFD_RELOC_LO16);
macro_build (NULL, "addu", "d,v,t", mips_gp_register,
mips_gp_register, tc_get_register (0));
macro_end ();
demand_empty_rest_of_line ();
}
/* Handle the .cpsetup pseudo-op defined for NewABI PIC code. The syntax is:
.cpsetup $reg1, offset|$reg2, label
If offset is given, this results in:
sd $gp, offset($sp)
lui $gp, %hi(%neg(%gp_rel(label)))
addiu $gp, $gp, %lo(%neg(%gp_rel(label)))
daddu $gp, $gp, $reg1
If $reg2 is given, this results in:
daddu $reg2, $gp, $0
lui $gp, %hi(%neg(%gp_rel(label)))
addiu $gp, $gp, %lo(%neg(%gp_rel(label)))
daddu $gp, $gp, $reg1
$reg1 is normally $25 == $t9. */
static void
s_cpsetup (int ignore ATTRIBUTE_UNUSED)
{
expressionS ex_off;
expressionS ex_sym;
int reg1;
char *f;
/* If we are not generating SVR4 PIC code, .cpsetup is ignored.
We also need NewABI support. */
if (mips_pic != SVR4_PIC || ! HAVE_NEWABI)
{
s_ignore (0);
return;
}
reg1 = tc_get_register (0);
SKIP_WHITESPACE ();
if (*input_line_pointer != ',')
{
as_bad (_("missing argument separator ',' for .cpsetup"));
return;
}
else
++input_line_pointer;
SKIP_WHITESPACE ();
if (*input_line_pointer == '$')
{
mips_cpreturn_register = tc_get_register (0);
mips_cpreturn_offset = -1;
}
else
{
mips_cpreturn_offset = get_absolute_expression ();
mips_cpreturn_register = -1;
}
SKIP_WHITESPACE ();
if (*input_line_pointer != ',')
{
as_bad (_("missing argument separator ',' for .cpsetup"));
return;
}
else
++input_line_pointer;
SKIP_WHITESPACE ();
expression (&ex_sym);
macro_start ();
if (mips_cpreturn_register == -1)
{
ex_off.X_op = O_constant;
ex_off.X_add_symbol = NULL;
ex_off.X_op_symbol = NULL;
ex_off.X_add_number = mips_cpreturn_offset;
macro_build (&ex_off, "sd", "t,o(b)", mips_gp_register,
BFD_RELOC_LO16, SP);
}
else
macro_build (NULL, "daddu", "d,v,t", mips_cpreturn_register,
mips_gp_register, 0);
/* Ensure there's room for the next two instructions, so that `f'
doesn't end up with an address in the wrong frag. */
frag_grow (8);
f = frag_more (0);
macro_build (&ex_sym, "lui", "t,u", mips_gp_register, BFD_RELOC_GPREL16);
fix_new (frag_now, f - frag_now->fr_literal,
8, NULL, 0, 0, BFD_RELOC_MIPS_SUB);
fix_new (frag_now, f - frag_now->fr_literal,
4, NULL, 0, 0, BFD_RELOC_HI16_S);
f = frag_more (0);
macro_build (&ex_sym, "addiu", "t,r,j", mips_gp_register,
mips_gp_register, BFD_RELOC_GPREL16);
fix_new (frag_now, f - frag_now->fr_literal,
8, NULL, 0, 0, BFD_RELOC_MIPS_SUB);
fix_new (frag_now, f - frag_now->fr_literal,
4, NULL, 0, 0, BFD_RELOC_LO16);
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", mips_gp_register,
mips_gp_register, reg1);
macro_end ();
demand_empty_rest_of_line ();
}
static void
s_cplocal (int ignore ATTRIBUTE_UNUSED)
{
/* If we are not generating SVR4 PIC code, or if this is not NewABI code,
.cplocal is ignored. */
if (mips_pic != SVR4_PIC || ! HAVE_NEWABI)
{
s_ignore (0);
return;
}
mips_gp_register = tc_get_register (0);
demand_empty_rest_of_line ();
}
/* Handle the .cprestore pseudo-op. This stores $gp into a given
offset from $sp. The offset is remembered, and after making a PIC
call $gp is restored from that location. */
static void
s_cprestore (int ignore ATTRIBUTE_UNUSED)
{
expressionS ex;
/* If we are not generating SVR4 PIC code, or if this is NewABI code,
.cprestore is ignored. */
if (mips_pic != SVR4_PIC || HAVE_NEWABI)
{
s_ignore (0);
return;
}
mips_cprestore_offset = get_absolute_expression ();
mips_cprestore_valid = 1;
ex.X_op = O_constant;
ex.X_add_symbol = NULL;
ex.X_op_symbol = NULL;
ex.X_add_number = mips_cprestore_offset;
macro_start ();
macro_build_ldst_constoffset (&ex, ADDRESS_STORE_INSN, mips_gp_register,
SP, HAVE_64BIT_ADDRESSES);
macro_end ();
demand_empty_rest_of_line ();
}
/* Handle the .cpreturn pseudo-op defined for NewABI PIC code. If an offset
was given in the preceding .cpsetup, it results in:
ld $gp, offset($sp)
If a register $reg2 was given there, it results in:
daddu $gp, $reg2, $0
*/
static void
s_cpreturn (int ignore ATTRIBUTE_UNUSED)
{
expressionS ex;
/* If we are not generating SVR4 PIC code, .cpreturn is ignored.
We also need NewABI support. */
if (mips_pic != SVR4_PIC || ! HAVE_NEWABI)
{
s_ignore (0);
return;
}
macro_start ();
if (mips_cpreturn_register == -1)
{
ex.X_op = O_constant;
ex.X_add_symbol = NULL;
ex.X_op_symbol = NULL;
ex.X_add_number = mips_cpreturn_offset;
macro_build (&ex, "ld", "t,o(b)", mips_gp_register, BFD_RELOC_LO16, SP);
}
else
macro_build (NULL, "daddu", "d,v,t", mips_gp_register,
mips_cpreturn_register, 0);
macro_end ();
demand_empty_rest_of_line ();
}
/* Handle the .gpvalue pseudo-op. This is used when generating NewABI PIC
code. It sets the offset to use in gp_rel relocations. */
static void
s_gpvalue (int ignore ATTRIBUTE_UNUSED)
{
/* If we are not generating SVR4 PIC code, .gpvalue is ignored.
We also need NewABI support. */
if (mips_pic != SVR4_PIC || ! HAVE_NEWABI)
{
s_ignore (0);
return;
}
mips_gprel_offset = get_absolute_expression ();
demand_empty_rest_of_line ();
}
/* Handle the .gpword pseudo-op. This is used when generating PIC
code. It generates a 32 bit GP relative reloc. */
static void
s_gpword (int ignore ATTRIBUTE_UNUSED)
{
symbolS *label;
expressionS ex;
char *p;
/* When not generating PIC code, this is treated as .word. */
if (mips_pic != SVR4_PIC)
{
s_cons (2);
return;
}
label = insn_labels != NULL ? insn_labels->label : NULL;
mips_emit_delays (TRUE);
if (auto_align)
mips_align (2, 0, label);
mips_clear_insn_labels ();
expression (&ex);
if (ex.X_op != O_symbol || ex.X_add_number != 0)
{
as_bad (_("Unsupported use of .gpword"));
ignore_rest_of_line ();
}
p = frag_more (4);
md_number_to_chars (p, 0, 4);
fix_new_exp (frag_now, p - frag_now->fr_literal, 4, &ex, FALSE,
BFD_RELOC_GPREL32);
demand_empty_rest_of_line ();
}
static void
s_gpdword (int ignore ATTRIBUTE_UNUSED)
{
symbolS *label;
expressionS ex;
char *p;
/* When not generating PIC code, this is treated as .dword. */
if (mips_pic != SVR4_PIC)
{
s_cons (3);
return;
}
label = insn_labels != NULL ? insn_labels->label : NULL;
mips_emit_delays (TRUE);
if (auto_align)
mips_align (3, 0, label);
mips_clear_insn_labels ();
expression (&ex);
if (ex.X_op != O_symbol || ex.X_add_number != 0)
{
as_bad (_("Unsupported use of .gpdword"));
ignore_rest_of_line ();
}
p = frag_more (8);
md_number_to_chars (p, 0, 8);
fix_new_exp (frag_now, p - frag_now->fr_literal, 4, &ex, FALSE,
BFD_RELOC_GPREL32);
/* GPREL32 composed with 64 gives a 64-bit GP offset. */
ex.X_op = O_absent;
ex.X_add_symbol = 0;
ex.X_add_number = 0;
fix_new_exp (frag_now, p - frag_now->fr_literal, 8, &ex, FALSE,
BFD_RELOC_64);
demand_empty_rest_of_line ();
}
/* Handle the .cpadd pseudo-op. This is used when dealing with switch
tables in SVR4 PIC code. */
static void
s_cpadd (int ignore ATTRIBUTE_UNUSED)
{
int reg;
/* This is ignored when not generating SVR4 PIC code. */
if (mips_pic != SVR4_PIC)
{
s_ignore (0);
return;
}
/* Add $gp to the register named as an argument. */
macro_start ();
reg = tc_get_register (0);
macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", reg, reg, mips_gp_register);
macro_end ();
demand_empty_rest_of_line ();
}
/* Handle the .insn pseudo-op. This marks instruction labels in
mips16 mode. This permits the linker to handle them specially,
such as generating jalx instructions when needed. We also make
them odd for the duration of the assembly, in order to generate the
right sort of code. We will make them even in the adjust_symtab
routine, while leaving them marked. This is convenient for the
debugger and the disassembler. The linker knows to make them odd
again. */
static void
s_insn (int ignore ATTRIBUTE_UNUSED)
{
mips16_mark_labels ();
demand_empty_rest_of_line ();
}
/* Handle a .stabn directive. We need these in order to mark a label
as being a mips16 text label correctly. Sometimes the compiler
will emit a label, followed by a .stabn, and then switch sections.
If the label and .stabn are in mips16 mode, then the label is
really a mips16 text label. */
static void
s_mips_stab (int type)
{
if (type == 'n')
mips16_mark_labels ();
s_stab (type);
}
/* Handle the .weakext pseudo-op as defined in Kane and Heinrich.
*/
static void
s_mips_weakext (int ignore ATTRIBUTE_UNUSED)
{
char *name;
int c;
symbolS *symbolP;
expressionS exp;
name = input_line_pointer;
c = get_symbol_end ();
symbolP = symbol_find_or_make (name);
S_SET_WEAK (symbolP);
*input_line_pointer = c;
SKIP_WHITESPACE ();
if (! is_end_of_line[(unsigned char) *input_line_pointer])
{
if (S_IS_DEFINED (symbolP))
{
as_bad ("ignoring attempt to redefine symbol %s",
S_GET_NAME (symbolP));
ignore_rest_of_line ();
return;
}
if (*input_line_pointer == ',')
{
++input_line_pointer;
SKIP_WHITESPACE ();
}
expression (&exp);
if (exp.X_op != O_symbol)
{
as_bad ("bad .weakext directive");
ignore_rest_of_line ();
return;
}
symbol_set_value_expression (symbolP, &exp);
}
demand_empty_rest_of_line ();
}
/* Parse a register string into a number. Called from the ECOFF code
to parse .frame. The argument is non-zero if this is the frame
register, so that we can record it in mips_frame_reg. */
int
tc_get_register (int frame)
{
int reg;
SKIP_WHITESPACE ();
if (*input_line_pointer++ != '$')
{
as_warn (_("expected `$'"));
reg = ZERO;
}
else if (ISDIGIT (*input_line_pointer))
{
reg = get_absolute_expression ();
if (reg < 0 || reg >= 32)
{
as_warn (_("Bad register number"));
reg = ZERO;
}
}
else
{
if (strncmp (input_line_pointer, "ra", 2) == 0)
{
reg = RA;
input_line_pointer += 2;
}
else if (strncmp (input_line_pointer, "fp", 2) == 0)
{
reg = FP;
input_line_pointer += 2;
}
else if (strncmp (input_line_pointer, "sp", 2) == 0)
{
reg = SP;
input_line_pointer += 2;
}
else if (strncmp (input_line_pointer, "gp", 2) == 0)
{
reg = GP;
input_line_pointer += 2;
}
else if (strncmp (input_line_pointer, "at", 2) == 0)
{
reg = AT;
input_line_pointer += 2;
}
else if (strncmp (input_line_pointer, "kt0", 3) == 0)
{
reg = KT0;
input_line_pointer += 3;
}
else if (strncmp (input_line_pointer, "kt1", 3) == 0)
{
reg = KT1;
input_line_pointer += 3;
}
else if (strncmp (input_line_pointer, "zero", 4) == 0)
{
reg = ZERO;
input_line_pointer += 4;
}
else
{
as_warn (_("Unrecognized register name"));
reg = ZERO;
while (ISALNUM(*input_line_pointer))
input_line_pointer++;
}
}
if (frame)
{
mips_frame_reg = reg != 0 ? reg : SP;
mips_frame_reg_valid = 1;
mips_cprestore_valid = 0;
}
return reg;
}
valueT
md_section_align (asection *seg, valueT addr)
{
int align = bfd_get_section_alignment (stdoutput, seg);
#ifdef OBJ_ELF
/* We don't need to align ELF sections to the full alignment.
However, Irix 5 may prefer that we align them at least to a 16
byte boundary. We don't bother to align the sections if we are
targeted for an embedded system. */
if (strcmp (TARGET_OS, "elf") == 0)
return addr;
if (align > 4)
align = 4;
#endif
return ((addr + (1 << align) - 1) & (-1 << align));
}
/* Utility routine, called from above as well. If called while the
input file is still being read, it's only an approximation. (For
example, a symbol may later become defined which appeared to be
undefined earlier.) */
static int
nopic_need_relax (symbolS *sym, int before_relaxing)
{
if (sym == 0)
return 0;
if (g_switch_value > 0)
{
const char *symname;
int change;
/* Find out whether this symbol can be referenced off the $gp
register. It can be if it is smaller than the -G size or if
it is in the .sdata or .sbss section. Certain symbols can
not be referenced off the $gp, although it appears as though
they can. */
symname = S_GET_NAME (sym);
if (symname != (const char *) NULL
&& (strcmp (symname, "eprol") == 0
|| strcmp (symname, "etext") == 0
|| strcmp (symname, "_gp") == 0
|| strcmp (symname, "edata") == 0
|| strcmp (symname, "_fbss") == 0
|| strcmp (symname, "_fdata") == 0
|| strcmp (symname, "_ftext") == 0
|| strcmp (symname, "end") == 0
|| strcmp (symname, "_gp_disp") == 0))
change = 1;
else if ((! S_IS_DEFINED (sym) || S_IS_COMMON (sym))
&& (0
#ifndef NO_ECOFF_DEBUGGING
|| (symbol_get_obj (sym)->ecoff_extern_size != 0
&& (symbol_get_obj (sym)->ecoff_extern_size
<= g_switch_value))
#endif
/* We must defer this decision until after the whole
file has been read, since there might be a .extern
after the first use of this symbol. */
|| (before_relaxing
#ifndef NO_ECOFF_DEBUGGING
&& symbol_get_obj (sym)->ecoff_extern_size == 0
#endif
&& S_GET_VALUE (sym) == 0)
|| (S_GET_VALUE (sym) != 0
&& S_GET_VALUE (sym) <= g_switch_value)))
change = 0;
else
{
const char *segname;
segname = segment_name (S_GET_SEGMENT (sym));
assert (strcmp (segname, ".lit8") != 0
&& strcmp (segname, ".lit4") != 0);
change = (strcmp (segname, ".sdata") != 0
&& strcmp (segname, ".sbss") != 0
&& strncmp (segname, ".sdata.", 7) != 0
&& strncmp (segname, ".gnu.linkonce.s.", 16) != 0);
}
return change;
}
else
/* We are not optimizing for the $gp register. */
return 1;
}
/* Return true if the given symbol should be considered local for SVR4 PIC. */
static bfd_boolean
pic_need_relax (symbolS *sym, asection *segtype)
{
asection *symsec;
bfd_boolean linkonce;
/* Handle the case of a symbol equated to another symbol. */
while (symbol_equated_reloc_p (sym))
{
symbolS *n;
/* It's possible to get a loop here in a badly written
program. */
n = symbol_get_value_expression (sym)->X_add_symbol;
if (n == sym)
break;
sym = n;
}
symsec = S_GET_SEGMENT (sym);
/* duplicate the test for LINK_ONCE sections as in adjust_reloc_syms */
linkonce = FALSE;
if (symsec != segtype && ! S_IS_LOCAL (sym))
{
if ((bfd_get_section_flags (stdoutput, symsec) & SEC_LINK_ONCE)
!= 0)
linkonce = TRUE;
/* The GNU toolchain uses an extension for ELF: a section
beginning with the magic string .gnu.linkonce is a linkonce
section. */
if (strncmp (segment_name (symsec), ".gnu.linkonce",
sizeof ".gnu.linkonce" - 1) == 0)
linkonce = TRUE;
}
/* This must duplicate the test in adjust_reloc_syms. */
return (symsec != &bfd_und_section
&& symsec != &bfd_abs_section
&& ! bfd_is_com_section (symsec)
&& !linkonce
#ifdef OBJ_ELF
/* A global or weak symbol is treated as external. */
&& (OUTPUT_FLAVOR != bfd_target_elf_flavour
|| (! S_IS_WEAK (sym) && ! S_IS_EXTERNAL (sym)))
#endif
);
}
/* Given a mips16 variant frag FRAGP, return non-zero if it needs an
extended opcode. SEC is the section the frag is in. */
static int
mips16_extended_frag (fragS *fragp, asection *sec, long stretch)
{
int type;
register const struct mips16_immed_operand *op;
offsetT val;
int mintiny, maxtiny;
segT symsec;
fragS *sym_frag;
if (RELAX_MIPS16_USER_SMALL (fragp->fr_subtype))
return 0;
if (RELAX_MIPS16_USER_EXT (fragp->fr_subtype))
return 1;
type = RELAX_MIPS16_TYPE (fragp->fr_subtype);
op = mips16_immed_operands;
while (op->type != type)
{
++op;
assert (op < mips16_immed_operands + MIPS16_NUM_IMMED);
}
if (op->unsp)
{
if (type == '<' || type == '>' || type == '[' || type == ']')
{
mintiny = 1;
maxtiny = 1 << op->nbits;
}
else
{
mintiny = 0;
maxtiny = (1 << op->nbits) - 1;
}
}
else
{
mintiny = - (1 << (op->nbits - 1));
maxtiny = (1 << (op->nbits - 1)) - 1;
}
sym_frag = symbol_get_frag (fragp->fr_symbol);
val = S_GET_VALUE (fragp->fr_symbol);
symsec = S_GET_SEGMENT (fragp->fr_symbol);
if (op->pcrel)
{
addressT addr;
/* We won't have the section when we are called from
mips_relax_frag. However, we will always have been called
from md_estimate_size_before_relax first. If this is a
branch to a different section, we mark it as such. If SEC is
NULL, and the frag is not marked, then it must be a branch to
the same section. */
if (sec == NULL)
{
if (RELAX_MIPS16_LONG_BRANCH (fragp->fr_subtype))
return 1;
}
else
{
/* Must have been called from md_estimate_size_before_relax. */
if (symsec != sec)
{
fragp->fr_subtype =
RELAX_MIPS16_MARK_LONG_BRANCH (fragp->fr_subtype);
/* FIXME: We should support this, and let the linker
catch branches and loads that are out of range. */
as_bad_where (fragp->fr_file, fragp->fr_line,
_("unsupported PC relative reference to different section"));
return 1;
}
if (fragp != sym_frag && sym_frag->fr_address == 0)
/* Assume non-extended on the first relaxation pass.
The address we have calculated will be bogus if this is
a forward branch to another frag, as the forward frag
will have fr_address == 0. */
return 0;
}
/* In this case, we know for sure that the symbol fragment is in
the same section. If the relax_marker of the symbol fragment
differs from the relax_marker of this fragment, we have not
yet adjusted the symbol fragment fr_address. We want to add
in STRETCH in order to get a better estimate of the address.
This particularly matters because of the shift bits. */
if (stretch != 0
&& sym_frag->relax_marker != fragp->relax_marker)
{
fragS *f;
/* Adjust stretch for any alignment frag. Note that if have
been expanding the earlier code, the symbol may be
defined in what appears to be an earlier frag. FIXME:
This doesn't handle the fr_subtype field, which specifies
a maximum number of bytes to skip when doing an
alignment. */
for (f = fragp; f != NULL && f != sym_frag; f = f->fr_next)
{
if (f->fr_type == rs_align || f->fr_type == rs_align_code)
{
if (stretch < 0)
stretch = - ((- stretch)
& ~ ((1 << (int) f->fr_offset) - 1));
else
stretch &= ~ ((1 << (int) f->fr_offset) - 1);
if (stretch == 0)
break;
}
}
if (f != NULL)
val += stretch;
}
addr = fragp->fr_address + fragp->fr_fix;
/* The base address rules are complicated. The base address of
a branch is the following instruction. The base address of a
PC relative load or add is the instruction itself, but if it
is in a delay slot (in which case it can not be extended) use
the address of the instruction whose delay slot it is in. */
if (type == 'p' || type == 'q')
{
addr += 2;
/* If we are currently assuming that this frag should be
extended, then, the current address is two bytes
higher. */
if (RELAX_MIPS16_EXTENDED (fragp->fr_subtype))
addr += 2;
/* Ignore the low bit in the target, since it will be set
for a text label. */
if ((val & 1) != 0)
--val;
}
else if (RELAX_MIPS16_JAL_DSLOT (fragp->fr_subtype))
addr -= 4;
else if (RELAX_MIPS16_DSLOT (fragp->fr_subtype))
addr -= 2;
val -= addr & ~ ((1 << op->shift) - 1);
/* Branch offsets have an implicit 0 in the lowest bit. */
if (type == 'p' || type == 'q')
val /= 2;
/* If any of the shifted bits are set, we must use an extended
opcode. If the address depends on the size of this
instruction, this can lead to a loop, so we arrange to always
use an extended opcode. We only check this when we are in
the main relaxation loop, when SEC is NULL. */
if ((val & ((1 << op->shift) - 1)) != 0 && sec == NULL)
{
fragp->fr_subtype =
RELAX_MIPS16_MARK_LONG_BRANCH (fragp->fr_subtype);
return 1;
}
/* If we are about to mark a frag as extended because the value
is precisely maxtiny + 1, then there is a chance of an
infinite loop as in the following code:
la $4,foo
.skip 1020
.align 2
foo:
In this case when the la is extended, foo is 0x3fc bytes
away, so the la can be shrunk, but then foo is 0x400 away, so
the la must be extended. To avoid this loop, we mark the
frag as extended if it was small, and is about to become
extended with a value of maxtiny + 1. */
if (val == ((maxtiny + 1) << op->shift)
&& ! RELAX_MIPS16_EXTENDED (fragp->fr_subtype)
&& sec == NULL)
{
fragp->fr_subtype =
RELAX_MIPS16_MARK_LONG_BRANCH (fragp->fr_subtype);
return 1;
}
}
else if (symsec != absolute_section && sec != NULL)
as_bad_where (fragp->fr_file, fragp->fr_line, _("unsupported relocation"));
if ((val & ((1 << op->shift) - 1)) != 0
|| val < (mintiny << op->shift)
|| val > (maxtiny << op->shift))
return 1;
else
return 0;
}
/* Compute the length of a branch sequence, and adjust the
RELAX_BRANCH_TOOFAR bit accordingly. If FRAGP is NULL, the
worst-case length is computed, with UPDATE being used to indicate
whether an unconditional (-1), branch-likely (+1) or regular (0)
branch is to be computed. */
static int
relaxed_branch_length (fragS *fragp, asection *sec, int update)
{
bfd_boolean toofar;
int length;
if (fragp
&& S_IS_DEFINED (fragp->fr_symbol)
&& sec == S_GET_SEGMENT (fragp->fr_symbol))
{
addressT addr;
offsetT val;
val = S_GET_VALUE (fragp->fr_symbol) + fragp->fr_offset;
addr = fragp->fr_address + fragp->fr_fix + 4;
val -= addr;
toofar = val < - (0x8000 << 2) || val >= (0x8000 << 2);
}
else if (fragp)
/* If the symbol is not defined or it's in a different segment,
assume the user knows what's going on and emit a short
branch. */
toofar = FALSE;
else
toofar = TRUE;
if (fragp && update && toofar != RELAX_BRANCH_TOOFAR (fragp->fr_subtype))
fragp->fr_subtype
= RELAX_BRANCH_ENCODE (RELAX_BRANCH_UNCOND (fragp->fr_subtype),
RELAX_BRANCH_LIKELY (fragp->fr_subtype),
RELAX_BRANCH_LINK (fragp->fr_subtype),
toofar);
length = 4;
if (toofar)
{
if (fragp ? RELAX_BRANCH_LIKELY (fragp->fr_subtype) : (update > 0))
length += 8;
if (mips_pic != NO_PIC)
{
/* Additional space for PIC loading of target address. */
length += 8;
if (mips_opts.isa == ISA_MIPS1)
/* Additional space for $at-stabilizing nop. */
length += 4;
}
/* If branch is conditional. */
if (fragp ? !RELAX_BRANCH_UNCOND (fragp->fr_subtype) : (update >= 0))
length += 8;
}
return length;
}
/* Estimate the size of a frag before relaxing. Unless this is the
mips16, we are not really relaxing here, and the final size is
encoded in the subtype information. For the mips16, we have to
decide whether we are using an extended opcode or not. */
int
md_estimate_size_before_relax (fragS *fragp, asection *segtype)
{
int change;
if (RELAX_BRANCH_P (fragp->fr_subtype))
{
fragp->fr_var = relaxed_branch_length (fragp, segtype, FALSE);
return fragp->fr_var;
}
if (RELAX_MIPS16_P (fragp->fr_subtype))
/* We don't want to modify the EXTENDED bit here; it might get us
into infinite loops. We change it only in mips_relax_frag(). */
return (RELAX_MIPS16_EXTENDED (fragp->fr_subtype) ? 4 : 2);
if (mips_pic == NO_PIC)
change = nopic_need_relax (fragp->fr_symbol, 0);
else if (mips_pic == SVR4_PIC)
change = pic_need_relax (fragp->fr_symbol, segtype);
else
abort ();
if (change)
{
fragp->fr_subtype |= RELAX_USE_SECOND;
return -RELAX_FIRST (fragp->fr_subtype);
}
else
return -RELAX_SECOND (fragp->fr_subtype);
}
/* This is called to see whether a reloc against a defined symbol
should be converted into a reloc against a section. Don't adjust
MIPS16 jump relocations, so we don't have to worry about the format
of the offset in the .o file. Don't adjust relocations against
mips16 symbols, so that the linker can find them if it needs to set
up a stub. */
int
mips_fix_adjustable (fixS *fixp)
{
if (fixp->fx_r_type == BFD_RELOC_MIPS16_JMP)
return 0;
if (fixp->fx_r_type == BFD_RELOC_VTABLE_INHERIT
|| fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
return 0;
if (fixp->fx_addsy == NULL)
return 1;
#ifdef OBJ_ELF
if (OUTPUT_FLAVOR == bfd_target_elf_flavour
&& S_GET_OTHER (fixp->fx_addsy) == STO_MIPS16
&& fixp->fx_subsy == NULL)
return 0;
#endif
return 1;
}
/* Translate internal representation of relocation info to BFD target
format. */
arelent **
tc_gen_reloc (asection *section ATTRIBUTE_UNUSED, fixS *fixp)
{
static arelent *retval[4];
arelent *reloc;
bfd_reloc_code_real_type code;
memset (retval, 0, sizeof(retval));
reloc = retval[0] = (arelent *) xcalloc (1, sizeof (arelent));
reloc->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *));
*reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
reloc->address = fixp->fx_frag->fr_address + fixp->fx_where;
assert (! fixp->fx_pcrel);
reloc->addend = fixp->fx_addnumber;
/* Since the old MIPS ELF ABI uses Rel instead of Rela, encode the vtable
entry to be used in the relocation's section offset. */
if (! HAVE_NEWABI && fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
{
reloc->address = reloc->addend;
reloc->addend = 0;
}
code = fixp->fx_r_type;
/* To support a PC relative reloc, we used a Cygnus extension.
We check for that here to make sure that we don't let such a
reloc escape normally. (FIXME: This was formerly used by
embedded-PIC support, but is now used by branch handling in
general. That probably should be fixed.) */
if ((OUTPUT_FLAVOR == bfd_target_ecoff_flavour
|| OUTPUT_FLAVOR == bfd_target_elf_flavour)
&& code == BFD_RELOC_16_PCREL_S2)
reloc->howto = NULL;
else
reloc->howto = bfd_reloc_type_lookup (stdoutput, code);
if (reloc->howto == NULL)
{
as_bad_where (fixp->fx_file, fixp->fx_line,
_("Can not represent %s relocation in this object file format"),
bfd_get_reloc_code_name (code));
retval[0] = NULL;
}
return retval;
}
/* Relax a machine dependent frag. This returns the amount by which
the current size of the frag should change. */
int
mips_relax_frag (asection *sec, fragS *fragp, long stretch)
{
if (RELAX_BRANCH_P (fragp->fr_subtype))
{
offsetT old_var = fragp->fr_var;
fragp->fr_var = relaxed_branch_length (fragp, sec, TRUE);
return fragp->fr_var - old_var;
}
if (! RELAX_MIPS16_P (fragp->fr_subtype))
return 0;
if (mips16_extended_frag (fragp, NULL, stretch))
{
if (RELAX_MIPS16_EXTENDED (fragp->fr_subtype))
return 0;
fragp->fr_subtype = RELAX_MIPS16_MARK_EXTENDED (fragp->fr_subtype);
return 2;
}
else
{
if (! RELAX_MIPS16_EXTENDED (fragp->fr_subtype))
return 0;
fragp->fr_subtype = RELAX_MIPS16_CLEAR_EXTENDED (fragp->fr_subtype);
return -2;
}
return 0;
}
/* Convert a machine dependent frag. */
void
md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED, segT asec, fragS *fragp)
{
if (RELAX_BRANCH_P (fragp->fr_subtype))
{
bfd_byte *buf;
unsigned long insn;
expressionS exp;
fixS *fixp;
buf = (bfd_byte *)fragp->fr_literal + fragp->fr_fix;
if (target_big_endian)
insn = bfd_getb32 (buf);
else
insn = bfd_getl32 (buf);
if (!RELAX_BRANCH_TOOFAR (fragp->fr_subtype))
{
/* We generate a fixup instead of applying it right now
because, if there are linker relaxations, we're going to
need the relocations. */
exp.X_op = O_symbol;
exp.X_add_symbol = fragp->fr_symbol;
exp.X_add_number = fragp->fr_offset;
fixp = fix_new_exp (fragp, buf - (bfd_byte *)fragp->fr_literal,
4, &exp, 1,
BFD_RELOC_16_PCREL_S2);
fixp->fx_file = fragp->fr_file;
fixp->fx_line = fragp->fr_line;
md_number_to_chars (buf, insn, 4);
buf += 4;
}
else
{
int i;
as_warn_where (fragp->fr_file, fragp->fr_line,
_("relaxed out-of-range branch into a jump"));
if (RELAX_BRANCH_UNCOND (fragp->fr_subtype))
goto uncond;
if (!RELAX_BRANCH_LIKELY (fragp->fr_subtype))
{
/* Reverse the branch. */
switch ((insn >> 28) & 0xf)
{
case 4:
/* bc[0-3][tf]l? and bc1any[24][ft] instructions can
have the condition reversed by tweaking a single
bit, and their opcodes all have 0x4???????. */
assert ((insn & 0xf1000000) == 0x41000000);
insn ^= 0x00010000;
break;
case 0:
/* bltz 0x04000000 bgez 0x04010000
bltzal 0x04100000 bgezal 0x04110000 */
assert ((insn & 0xfc0e0000) == 0x04000000);
insn ^= 0x00010000;
break;
case 1:
/* beq 0x10000000 bne 0x14000000
blez 0x18000000 bgtz 0x1c000000 */
insn ^= 0x04000000;
break;
default:
abort ();
}
}
if (RELAX_BRANCH_LINK (fragp->fr_subtype))
{
/* Clear the and-link bit. */
assert ((insn & 0xfc1c0000) == 0x04100000);
/* bltzal 0x04100000 bgezal 0x04110000
bltzall 0x04120000 bgezall 0x04130000 */
insn &= ~0x00100000;
}
/* Branch over the branch (if the branch was likely) or the
full jump (not likely case). Compute the offset from the
current instruction to branch to. */
if (RELAX_BRANCH_LIKELY (fragp->fr_subtype))
i = 16;
else
{
/* How many bytes in instructions we've already emitted? */
i = buf - (bfd_byte *)fragp->fr_literal - fragp->fr_fix;
/* How many bytes in instructions from here to the end? */
i = fragp->fr_var - i;
}
/* Convert to instruction count. */
i >>= 2;
/* Branch counts from the next instruction. */
i--;
insn |= i;
/* Branch over the jump. */
md_number_to_chars (buf, insn, 4);
buf += 4;
/* Nop */
md_number_to_chars (buf, 0, 4);
buf += 4;
if (RELAX_BRANCH_LIKELY (fragp->fr_subtype))
{
/* beql $0, $0, 2f */
insn = 0x50000000;
/* Compute the PC offset from the current instruction to
the end of the variable frag. */
/* How many bytes in instructions we've already emitted? */
i = buf - (bfd_byte *)fragp->fr_literal - fragp->fr_fix;
/* How many bytes in instructions from here to the end? */
i = fragp->fr_var - i;
/* Convert to instruction count. */
i >>= 2;
/* Don't decrement i, because we want to branch over the
delay slot. */
insn |= i;
md_number_to_chars (buf, insn, 4);
buf += 4;
md_number_to_chars (buf, 0, 4);
buf += 4;
}
uncond:
if (mips_pic == NO_PIC)
{
/* j or jal. */
insn = (RELAX_BRANCH_LINK (fragp->fr_subtype)
? 0x0c000000 : 0x08000000);
exp.X_op = O_symbol;
exp.X_add_symbol = fragp->fr_symbol;
exp.X_add_number = fragp->fr_offset;
fixp = fix_new_exp (fragp, buf - (bfd_byte *)fragp->fr_literal,
4, &exp, 0, BFD_RELOC_MIPS_JMP);
fixp->fx_file = fragp->fr_file;
fixp->fx_line = fragp->fr_line;
md_number_to_chars (buf, insn, 4);
buf += 4;
}
else
{
/* lw/ld $at, <sym>($gp) R_MIPS_GOT16 */
insn = HAVE_64BIT_ADDRESSES ? 0xdf810000 : 0x8f810000;
exp.X_op = O_symbol;
exp.X_add_symbol = fragp->fr_symbol;
exp.X_add_number = fragp->fr_offset;
if (fragp->fr_offset)
{
exp.X_add_symbol = make_expr_symbol (&exp);
exp.X_add_number = 0;
}
fixp = fix_new_exp (fragp, buf - (bfd_byte *)fragp->fr_literal,
4, &exp, 0, BFD_RELOC_MIPS_GOT16);
fixp->fx_file = fragp->fr_file;
fixp->fx_line = fragp->fr_line;
md_number_to_chars (buf, insn, 4);
buf += 4;
if (mips_opts.isa == ISA_MIPS1)
{
/* nop */
md_number_to_chars (buf, 0, 4);
buf += 4;
}
/* d/addiu $at, $at, <sym> R_MIPS_LO16 */
insn = HAVE_64BIT_ADDRESSES ? 0x64210000 : 0x24210000;
fixp = fix_new_exp (fragp, buf - (bfd_byte *)fragp->fr_literal,
4, &exp, 0, BFD_RELOC_LO16);
fixp->fx_file = fragp->fr_file;
fixp->fx_line = fragp->fr_line;
md_number_to_chars (buf, insn, 4);
buf += 4;
/* j(al)r $at. */
if (RELAX_BRANCH_LINK (fragp->fr_subtype))
insn = 0x0020f809;
else
insn = 0x00200008;
md_number_to_chars (buf, insn, 4);
buf += 4;
}
}
assert (buf == (bfd_byte *)fragp->fr_literal
+ fragp->fr_fix + fragp->fr_var);
fragp->fr_fix += fragp->fr_var;
return;
}
if (RELAX_MIPS16_P (fragp->fr_subtype))
{
int type;
register const struct mips16_immed_operand *op;
bfd_boolean small, ext;
offsetT val;
bfd_byte *buf;
unsigned long insn;
bfd_boolean use_extend;
unsigned short extend;
type = RELAX_MIPS16_TYPE (fragp->fr_subtype);
op = mips16_immed_operands;
while (op->type != type)
++op;
if (RELAX_MIPS16_EXTENDED (fragp->fr_subtype))
{
small = FALSE;
ext = TRUE;
}
else
{
small = TRUE;
ext = FALSE;
}
resolve_symbol_value (fragp->fr_symbol);
val = S_GET_VALUE (fragp->fr_symbol);
if (op->pcrel)
{
addressT addr;
addr = fragp->fr_address + fragp->fr_fix;
/* The rules for the base address of a PC relative reloc are
complicated; see mips16_extended_frag. */
if (type == 'p' || type == 'q')
{
addr += 2;
if (ext)
addr += 2;
/* Ignore the low bit in the target, since it will be
set for a text label. */
if ((val & 1) != 0)
--val;
}
else if (RELAX_MIPS16_JAL_DSLOT (fragp->fr_subtype))
addr -= 4;
else if (RELAX_MIPS16_DSLOT (fragp->fr_subtype))
addr -= 2;
addr &= ~ (addressT) ((1 << op->shift) - 1);
val -= addr;
/* Make sure the section winds up with the alignment we have
assumed. */
if (op->shift > 0)
record_alignment (asec, op->shift);
}
if (ext
&& (RELAX_MIPS16_JAL_DSLOT (fragp->fr_subtype)
|| RELAX_MIPS16_DSLOT (fragp->fr_subtype)))
as_warn_where (fragp->fr_file, fragp->fr_line,
_("extended instruction in delay slot"));
buf = (bfd_byte *) (fragp->fr_literal + fragp->fr_fix);
if (target_big_endian)
insn = bfd_getb16 (buf);
else
insn = bfd_getl16 (buf);
mips16_immed (fragp->fr_file, fragp->fr_line, type, val,
RELAX_MIPS16_USER_EXT (fragp->fr_subtype),
small, ext, &insn, &use_extend, &extend);
if (use_extend)
{
md_number_to_chars (buf, 0xf000 | extend, 2);
fragp->fr_fix += 2;
buf += 2;
}
md_number_to_chars (buf, insn, 2);
fragp->fr_fix += 2;
buf += 2;
}
else
{
int first, second;
fixS *fixp;
first = RELAX_FIRST (fragp->fr_subtype);
second = RELAX_SECOND (fragp->fr_subtype);
fixp = (fixS *) fragp->fr_opcode;
/* Possibly emit a warning if we've chosen the longer option. */
if (((fragp->fr_subtype & RELAX_USE_SECOND) != 0)
== ((fragp->fr_subtype & RELAX_SECOND_LONGER) != 0))
{
const char *msg = macro_warning (fragp->fr_subtype);
if (msg != 0)
as_warn_where (fragp->fr_file, fragp->fr_line, msg);
}
/* Go through all the fixups for the first sequence. Disable them
(by marking them as done) if we're going to use the second
sequence instead. */
while (fixp
&& fixp->fx_frag == fragp
&& fixp->fx_where < fragp->fr_fix - second)
{
if (fragp->fr_subtype & RELAX_USE_SECOND)
fixp->fx_done = 1;
fixp = fixp->fx_next;
}
/* Go through the fixups for the second sequence. Disable them if
we're going to use the first sequence, otherwise adjust their
addresses to account for the relaxation. */
while (fixp && fixp->fx_frag == fragp)
{
if (fragp->fr_subtype & RELAX_USE_SECOND)
fixp->fx_where -= first;
else
fixp->fx_done = 1;
fixp = fixp->fx_next;
}
/* Now modify the frag contents. */
if (fragp->fr_subtype & RELAX_USE_SECOND)
{
char *start;
start = fragp->fr_literal + fragp->fr_fix - first - second;
memmove (start, start + first, second);
fragp->fr_fix -= first;
}
else
fragp->fr_fix -= second;
}
}
#ifdef OBJ_ELF
/* This function is called after the relocs have been generated.
We've been storing mips16 text labels as odd. Here we convert them
back to even for the convenience of the debugger. */
void
mips_frob_file_after_relocs (void)
{
asymbol **syms;
unsigned int count, i;
if (OUTPUT_FLAVOR != bfd_target_elf_flavour)
return;
syms = bfd_get_outsymbols (stdoutput);
count = bfd_get_symcount (stdoutput);
for (i = 0; i < count; i++, syms++)
{
if (elf_symbol (*syms)->internal_elf_sym.st_other == STO_MIPS16
&& ((*syms)->value & 1) != 0)
{
(*syms)->value &= ~1;
/* If the symbol has an odd size, it was probably computed
incorrectly, so adjust that as well. */
if ((elf_symbol (*syms)->internal_elf_sym.st_size & 1) != 0)
++elf_symbol (*syms)->internal_elf_sym.st_size;
}
}
}
#endif
/* This function is called whenever a label is defined. It is used
when handling branch delays; if a branch has a label, we assume we
can not move it. */
void
mips_define_label (symbolS *sym)
{
struct insn_label_list *l;
if (free_insn_labels == NULL)
l = (struct insn_label_list *) xmalloc (sizeof *l);
else
{
l = free_insn_labels;
free_insn_labels = l->next;
}
l->label = sym;
l->next = insn_labels;
insn_labels = l;
}
#if defined (OBJ_ELF) || defined (OBJ_MAYBE_ELF)
/* Some special processing for a MIPS ELF file. */
void
mips_elf_final_processing (void)
{
/* Write out the register information. */
if (mips_abi != N64_ABI)
{
Elf32_RegInfo s;
s.ri_gprmask = mips_gprmask;
s.ri_cprmask[0] = mips_cprmask[0];
s.ri_cprmask[1] = mips_cprmask[1];
s.ri_cprmask[2] = mips_cprmask[2];
s.ri_cprmask[3] = mips_cprmask[3];
/* The gp_value field is set by the MIPS ELF backend. */
bfd_mips_elf32_swap_reginfo_out (stdoutput, &s,
((Elf32_External_RegInfo *)
mips_regmask_frag));
}
else
{
Elf64_Internal_RegInfo s;
s.ri_gprmask = mips_gprmask;
s.ri_pad = 0;
s.ri_cprmask[0] = mips_cprmask[0];
s.ri_cprmask[1] = mips_cprmask[1];
s.ri_cprmask[2] = mips_cprmask[2];
s.ri_cprmask[3] = mips_cprmask[3];
/* The gp_value field is set by the MIPS ELF backend. */
bfd_mips_elf64_swap_reginfo_out (stdoutput, &s,
((Elf64_External_RegInfo *)
mips_regmask_frag));
}
/* Set the MIPS ELF flag bits. FIXME: There should probably be some
sort of BFD interface for this. */
if (mips_any_noreorder)
elf_elfheader (stdoutput)->e_flags |= EF_MIPS_NOREORDER;
if (mips_pic != NO_PIC)
{
elf_elfheader (stdoutput)->e_flags |= EF_MIPS_PIC;
elf_elfheader (stdoutput)->e_flags |= EF_MIPS_CPIC;
}
if (mips_abicalls)
elf_elfheader (stdoutput)->e_flags |= EF_MIPS_CPIC;
/* Set MIPS ELF flags for ASEs. */
if (file_ase_mips16)
elf_elfheader (stdoutput)->e_flags |= EF_MIPS_ARCH_ASE_M16;
#if 0 /* XXX FIXME */
if (file_ase_mips3d)
elf_elfheader (stdoutput)->e_flags |= ???;
#endif
if (file_ase_mdmx)
elf_elfheader (stdoutput)->e_flags |= EF_MIPS_ARCH_ASE_MDMX;
/* Set the MIPS ELF ABI flags. */
if (mips_abi == O32_ABI && USE_E_MIPS_ABI_O32)
elf_elfheader (stdoutput)->e_flags |= E_MIPS_ABI_O32;
else if (mips_abi == O64_ABI)
elf_elfheader (stdoutput)->e_flags |= E_MIPS_ABI_O64;
else if (mips_abi == EABI_ABI)
{
if (!file_mips_gp32)
elf_elfheader (stdoutput)->e_flags |= E_MIPS_ABI_EABI64;
else
elf_elfheader (stdoutput)->e_flags |= E_MIPS_ABI_EABI32;
}
else if (mips_abi == N32_ABI)
elf_elfheader (stdoutput)->e_flags |= EF_MIPS_ABI2;
/* Nothing to do for N64_ABI. */
if (mips_32bitmode)
elf_elfheader (stdoutput)->e_flags |= EF_MIPS_32BITMODE;
}
#endif /* OBJ_ELF || OBJ_MAYBE_ELF */
typedef struct proc {
symbolS *isym;
unsigned long reg_mask;
unsigned long reg_offset;
unsigned long fpreg_mask;
unsigned long fpreg_offset;
unsigned long frame_offset;
unsigned long frame_reg;
unsigned long pc_reg;
} procS;
static procS cur_proc;
static procS *cur_proc_ptr;
static int numprocs;
/* Fill in an rs_align_code fragment. */
void
mips_handle_align (fragS *fragp)
{
if (fragp->fr_type != rs_align_code)
return;
if (mips_opts.mips16)
{
static const unsigned char be_nop[] = { 0x65, 0x00 };
static const unsigned char le_nop[] = { 0x00, 0x65 };
int bytes;
char *p;
bytes = fragp->fr_next->fr_address - fragp->fr_address - fragp->fr_fix;
p = fragp->fr_literal + fragp->fr_fix;
if (bytes & 1)
{
*p++ = 0;
fragp->fr_fix++;
}
memcpy (p, (target_big_endian ? be_nop : le_nop), 2);
fragp->fr_var = 2;
}
/* For mips32, a nop is a zero, which we trivially get by doing nothing. */
}
static void
md_obj_begin (void)
{
}
static void
md_obj_end (void)
{
/* check for premature end, nesting errors, etc */
if (cur_proc_ptr)
as_warn (_("missing .end at end of assembly"));
}
static long
get_number (void)
{
int negative = 0;
long val = 0;
if (*input_line_pointer == '-')
{
++input_line_pointer;
negative = 1;
}
if (!ISDIGIT (*input_line_pointer))
as_bad (_("expected simple number"));
if (input_line_pointer[0] == '0')
{
if (input_line_pointer[1] == 'x')
{
input_line_pointer += 2;
while (ISXDIGIT (*input_line_pointer))
{
val <<= 4;
val |= hex_value (*input_line_pointer++);
}
return negative ? -val : val;
}
else
{
++input_line_pointer;
while (ISDIGIT (*input_line_pointer))
{
val <<= 3;
val |= *input_line_pointer++ - '0';
}
return negative ? -val : val;
}
}
if (!ISDIGIT (*input_line_pointer))
{
printf (_(" *input_line_pointer == '%c' 0x%02x\n"),
*input_line_pointer, *input_line_pointer);
as_warn (_("invalid number"));
return -1;
}
while (ISDIGIT (*input_line_pointer))
{
val *= 10;
val += *input_line_pointer++ - '0';
}
return negative ? -val : val;
}
/* The .file directive; just like the usual .file directive, but there
is an initial number which is the ECOFF file index. In the non-ECOFF
case .file implies DWARF-2. */
static void
s_mips_file (int x ATTRIBUTE_UNUSED)
{
static int first_file_directive = 0;
if (ECOFF_DEBUGGING)
{
get_number ();
s_app_file (0);
}
else
{
char *filename;
filename = dwarf2_directive_file (0);
/* Versions of GCC up to 3.1 start files with a ".file"
directive even for stabs output. Make sure that this
".file" is handled. Note that you need a version of GCC
after 3.1 in order to support DWARF-2 on MIPS. */
if (filename != NULL && ! first_file_directive)
{
(void) new_logical_line (filename, -1);
s_app_file_string (filename);
}
first_file_directive = 1;
}
}
/* The .loc directive, implying DWARF-2. */
static void
s_mips_loc (int x ATTRIBUTE_UNUSED)
{
if (!ECOFF_DEBUGGING)
dwarf2_directive_loc (0);
}
/* The .end directive. */
static void
s_mips_end (int x ATTRIBUTE_UNUSED)
{
symbolS *p;
/* Following functions need their own .frame and .cprestore directives. */
mips_frame_reg_valid = 0;
mips_cprestore_valid = 0;
if (!is_end_of_line[(unsigned char) *input_line_pointer])
{
p = get_symbol ();
demand_empty_rest_of_line ();
}
else
p = NULL;
if ((bfd_get_section_flags (stdoutput, now_seg) & SEC_CODE) == 0)
as_warn (_(".end not in text section"));
if (!cur_proc_ptr)
{
as_warn (_(".end directive without a preceding .ent directive."));
demand_empty_rest_of_line ();
return;
}
if (p != NULL)
{
assert (S_GET_NAME (p));
if (strcmp (S_GET_NAME (p), S_GET_NAME (cur_proc_ptr->isym)))
as_warn (_(".end symbol does not match .ent symbol."));
if (debug_type == DEBUG_STABS)
stabs_generate_asm_endfunc (S_GET_NAME (p),
S_GET_NAME (p));
}
else
as_warn (_(".end directive missing or unknown symbol"));
#ifdef OBJ_ELF
/* Generate a .pdr section. */
if (OUTPUT_FLAVOR == bfd_target_elf_flavour && ! ECOFF_DEBUGGING
&& mips_flag_pdr)
{
segT saved_seg = now_seg;
subsegT saved_subseg = now_subseg;
valueT dot;
expressionS exp;
char *fragp;
dot = frag_now_fix ();
#ifdef md_flush_pending_output
md_flush_pending_output ();
#endif
assert (pdr_seg);
subseg_set (pdr_seg, 0);
/* Write the symbol. */
exp.X_op = O_symbol;
exp.X_add_symbol = p;
exp.X_add_number = 0;
emit_expr (&exp, 4);
fragp = frag_more (7 * 4);
md_number_to_chars (fragp, cur_proc_ptr->reg_mask, 4);
md_number_to_chars (fragp + 4, cur_proc_ptr->reg_offset, 4);
md_number_to_chars (fragp + 8, cur_proc_ptr->fpreg_mask, 4);
md_number_to_chars (fragp + 12, cur_proc_ptr->fpreg_offset, 4);
md_number_to_chars (fragp + 16, cur_proc_ptr->frame_offset, 4);
md_number_to_chars (fragp + 20, cur_proc_ptr->frame_reg, 4);
md_number_to_chars (fragp + 24, cur_proc_ptr->pc_reg, 4);
subseg_set (saved_seg, saved_subseg);
}
#endif /* OBJ_ELF */
cur_proc_ptr = NULL;
}
/* The .aent and .ent directives. */
static void
s_mips_ent (int aent)
{
symbolS *symbolP;
symbolP = get_symbol ();
if (*input_line_pointer == ',')
++input_line_pointer;
SKIP_WHITESPACE ();
if (ISDIGIT (*input_line_pointer)
|| *input_line_pointer == '-')
get_number ();
if ((bfd_get_section_flags (stdoutput, now_seg) & SEC_CODE) == 0)
as_warn (_(".ent or .aent not in text section."));
if (!aent && cur_proc_ptr)
as_warn (_("missing .end"));
if (!aent)
{
/* This function needs its own .frame and .cprestore directives. */
mips_frame_reg_valid = 0;
mips_cprestore_valid = 0;
cur_proc_ptr = &cur_proc;
memset (cur_proc_ptr, '\0', sizeof (procS));
cur_proc_ptr->isym = symbolP;
symbol_get_bfdsym (symbolP)->flags |= BSF_FUNCTION;
++numprocs;
if (debug_type == DEBUG_STABS)
stabs_generate_asm_func (S_GET_NAME (symbolP),
S_GET_NAME (symbolP));
}
demand_empty_rest_of_line ();
}
/* The .frame directive. If the mdebug section is present (IRIX 5 native)
then ecoff.c (ecoff_directive_frame) is used. For embedded targets,
s_mips_frame is used so that we can set the PDR information correctly.
We can't use the ecoff routines because they make reference to the ecoff
symbol table (in the mdebug section). */
static void
s_mips_frame (int ignore ATTRIBUTE_UNUSED)
{
#ifdef OBJ_ELF
if (OUTPUT_FLAVOR == bfd_target_elf_flavour && ! ECOFF_DEBUGGING)
{
long val;
if (cur_proc_ptr == (procS *) NULL)
{
as_warn (_(".frame outside of .ent"));
demand_empty_rest_of_line ();
return;
}
cur_proc_ptr->frame_reg = tc_get_register (1);
SKIP_WHITESPACE ();
if (*input_line_pointer++ != ','
|| get_absolute_expression_and_terminator (&val) != ',')
{
as_warn (_("Bad .frame directive"));
--input_line_pointer;
demand_empty_rest_of_line ();
return;
}
cur_proc_ptr->frame_offset = val;
cur_proc_ptr->pc_reg = tc_get_register (0);
demand_empty_rest_of_line ();
}
else
#endif /* OBJ_ELF */
s_ignore (ignore);
}
/* The .fmask and .mask directives. If the mdebug section is present
(IRIX 5 native) then ecoff.c (ecoff_directive_mask) is used. For
embedded targets, s_mips_mask is used so that we can set the PDR
information correctly. We can't use the ecoff routines because they
make reference to the ecoff symbol table (in the mdebug section). */
static void
s_mips_mask (int reg_type)
{
#ifdef OBJ_ELF
if (OUTPUT_FLAVOR == bfd_target_elf_flavour && ! ECOFF_DEBUGGING)
{
long mask, off;
if (cur_proc_ptr == (procS *) NULL)
{
as_warn (_(".mask/.fmask outside of .ent"));
demand_empty_rest_of_line ();
return;
}
if (get_absolute_expression_and_terminator (&mask) != ',')
{
as_warn (_("Bad .mask/.fmask directive"));
--input_line_pointer;
demand_empty_rest_of_line ();
return;
}
off = get_absolute_expression ();
if (reg_type == 'F')
{
cur_proc_ptr->fpreg_mask = mask;
cur_proc_ptr->fpreg_offset = off;
}
else
{
cur_proc_ptr->reg_mask = mask;
cur_proc_ptr->reg_offset = off;
}
demand_empty_rest_of_line ();
}
else
#endif /* OBJ_ELF */
s_ignore (reg_type);
}
/* The .loc directive. */
#if 0
static void
s_loc (int x)
{
symbolS *symbolP;
int lineno;
int addroff;
assert (now_seg == text_section);
lineno = get_number ();
addroff = frag_now_fix ();
symbolP = symbol_new ("", N_SLINE, addroff, frag_now);
S_SET_TYPE (symbolP, N_SLINE);
S_SET_OTHER (symbolP, 0);
S_SET_DESC (symbolP, lineno);
symbolP->sy_segment = now_seg;
}
#endif
/* A table describing all the processors gas knows about. Names are
matched in the order listed.
To ease comparison, please keep this table in the same order as
gcc's mips_cpu_info_table[]. */
static const struct mips_cpu_info mips_cpu_info_table[] =
{
/* Entries for generic ISAs */
{ "mips1", 1, ISA_MIPS1, CPU_R3000 },
{ "mips2", 1, ISA_MIPS2, CPU_R6000 },
{ "mips3", 1, ISA_MIPS3, CPU_R4000 },
{ "mips4", 1, ISA_MIPS4, CPU_R8000 },
{ "mips5", 1, ISA_MIPS5, CPU_MIPS5 },
{ "mips32", 1, ISA_MIPS32, CPU_MIPS32 },
{ "mips32r2", 1, ISA_MIPS32R2, CPU_MIPS32R2 },
{ "mips64", 1, ISA_MIPS64, CPU_MIPS64 },
{ "mips64r2", 1, ISA_MIPS64R2, CPU_MIPS64R2 },
/* MIPS I */
{ "r3000", 0, ISA_MIPS1, CPU_R3000 },
{ "r2000", 0, ISA_MIPS1, CPU_R3000 },
{ "r3900", 0, ISA_MIPS1, CPU_R3900 },
/* MIPS II */
{ "r6000", 0, ISA_MIPS2, CPU_R6000 },
/* MIPS III */
{ "r4000", 0, ISA_MIPS3, CPU_R4000 },
{ "r4010", 0, ISA_MIPS2, CPU_R4010 },
{ "vr4100", 0, ISA_MIPS3, CPU_VR4100 },
{ "vr4111", 0, ISA_MIPS3, CPU_R4111 },
{ "vr4120", 0, ISA_MIPS3, CPU_VR4120 },
{ "vr4130", 0, ISA_MIPS3, CPU_VR4120 },
{ "vr4181", 0, ISA_MIPS3, CPU_R4111 },
{ "vr4300", 0, ISA_MIPS3, CPU_R4300 },
{ "r4400", 0, ISA_MIPS3, CPU_R4400 },
{ "r4600", 0, ISA_MIPS3, CPU_R4600 },
{ "orion", 0, ISA_MIPS3, CPU_R4600 },
{ "r4650", 0, ISA_MIPS3, CPU_R4650 },
/* MIPS IV */
{ "r8000", 0, ISA_MIPS4, CPU_R8000 },
{ "r10000", 0, ISA_MIPS4, CPU_R10000 },
{ "r12000", 0, ISA_MIPS4, CPU_R12000 },
{ "vr5000", 0, ISA_MIPS4, CPU_R5000 },
{ "vr5400", 0, ISA_MIPS4, CPU_VR5400 },
{ "vr5500", 0, ISA_MIPS4, CPU_VR5500 },
{ "rm5200", 0, ISA_MIPS4, CPU_R5000 },
{ "rm5230", 0, ISA_MIPS4, CPU_R5000 },
{ "rm5231", 0, ISA_MIPS4, CPU_R5000 },
{ "rm5261", 0, ISA_MIPS4, CPU_R5000 },
{ "rm5721", 0, ISA_MIPS4, CPU_R5000 },
{ "rm7000", 0, ISA_MIPS4, CPU_RM7000 },
{ "rm9000", 0, ISA_MIPS4, CPU_RM7000 },
/* MIPS 32 */
{ "4kc", 0, ISA_MIPS32, CPU_MIPS32 },
{ "4km", 0, ISA_MIPS32, CPU_MIPS32 },
{ "4kp", 0, ISA_MIPS32, CPU_MIPS32 },
/* MIPS 64 */
{ "5kc", 0, ISA_MIPS64, CPU_MIPS64 },
{ "20kc", 0, ISA_MIPS64, CPU_MIPS64 },
/* Broadcom SB-1 CPU core */
{ "sb1", 0, ISA_MIPS64, CPU_SB1 },
/* End marker */
{ NULL, 0, 0, 0 }
};
/* Return true if GIVEN is the same as CANONICAL, or if it is CANONICAL
with a final "000" replaced by "k". Ignore case.
Note: this function is shared between GCC and GAS. */
static bfd_boolean
mips_strict_matching_cpu_name_p (const char *canonical, const char *given)
{
while (*given != 0 && TOLOWER (*given) == TOLOWER (*canonical))
given++, canonical++;
return ((*given == 0 && *canonical == 0)
|| (strcmp (canonical, "000") == 0 && strcasecmp (given, "k") == 0));
}
/* Return true if GIVEN matches CANONICAL, where GIVEN is a user-supplied
CPU name. We've traditionally allowed a lot of variation here.
Note: this function is shared between GCC and GAS. */
static bfd_boolean
mips_matching_cpu_name_p (const char *canonical, const char *given)
{
/* First see if the name matches exactly, or with a final "000"
turned into "k". */
if (mips_strict_matching_cpu_name_p (canonical, given))
return TRUE;
/* If not, try comparing based on numerical designation alone.
See if GIVEN is an unadorned number, or 'r' followed by a number. */
if (TOLOWER (*given) == 'r')
given++;
if (!ISDIGIT (*given))
return FALSE;
/* Skip over some well-known prefixes in the canonical name,
hoping to find a number there too. */
if (TOLOWER (canonical[0]) == 'v' && TOLOWER (canonical[1]) == 'r')
canonical += 2;
else if (TOLOWER (canonical[0]) == 'r' && TOLOWER (canonical[1]) == 'm')
canonical += 2;
else if (TOLOWER (canonical[0]) == 'r')
canonical += 1;
return mips_strict_matching_cpu_name_p (canonical, given);
}
/* Parse an option that takes the name of a processor as its argument.
OPTION is the name of the option and CPU_STRING is the argument.
Return the corresponding processor enumeration if the CPU_STRING is
recognized, otherwise report an error and return null.
A similar function exists in GCC. */
static const struct mips_cpu_info *
mips_parse_cpu (const char *option, const char *cpu_string)
{
const struct mips_cpu_info *p;
/* 'from-abi' selects the most compatible architecture for the given
ABI: MIPS I for 32-bit ABIs and MIPS III for 64-bit ABIs. For the
EABIs, we have to decide whether we're using the 32-bit or 64-bit
version. Look first at the -mgp options, if given, otherwise base
the choice on MIPS_DEFAULT_64BIT.
Treat NO_ABI like the EABIs. One reason to do this is that the
plain 'mips' and 'mips64' configs have 'from-abi' as their default
architecture. This code picks MIPS I for 'mips' and MIPS III for
'mips64', just as we did in the days before 'from-abi'. */
if (strcasecmp (cpu_string, "from-abi") == 0)
{
if (ABI_NEEDS_32BIT_REGS (mips_abi))
return mips_cpu_info_from_isa (ISA_MIPS1);
if (ABI_NEEDS_64BIT_REGS (mips_abi))
return mips_cpu_info_from_isa (ISA_MIPS3);
if (file_mips_gp32 >= 0)
return mips_cpu_info_from_isa (file_mips_gp32 ? ISA_MIPS1 : ISA_MIPS3);
return mips_cpu_info_from_isa (MIPS_DEFAULT_64BIT
? ISA_MIPS3
: ISA_MIPS1);
}
/* 'default' has traditionally been a no-op. Probably not very useful. */
if (strcasecmp (cpu_string, "default") == 0)
return 0;
for (p = mips_cpu_info_table; p->name != 0; p++)
if (mips_matching_cpu_name_p (p->name, cpu_string))
return p;
as_bad ("Bad value (%s) for %s", cpu_string, option);
return 0;
}
/* Return the canonical processor information for ISA (a member of the
ISA_MIPS* enumeration). */
static const struct mips_cpu_info *
mips_cpu_info_from_isa (int isa)
{
int i;
for (i = 0; mips_cpu_info_table[i].name != NULL; i++)
if (mips_cpu_info_table[i].is_isa
&& isa == mips_cpu_info_table[i].isa)
return (&mips_cpu_info_table[i]);
return NULL;
}
static const struct mips_cpu_info *
mips_cpu_info_from_arch (int arch)
{
int i;
for (i = 0; mips_cpu_info_table[i].name != NULL; i++)
if (arch == mips_cpu_info_table[i].cpu)
return (&mips_cpu_info_table[i]);
return NULL;
}
static void
show (FILE *stream, const char *string, int *col_p, int *first_p)
{
if (*first_p)
{
fprintf (stream, "%24s", "");
*col_p = 24;
}
else
{
fprintf (stream, ", ");
*col_p += 2;
}
if (*col_p + strlen (string) > 72)
{
fprintf (stream, "\n%24s", "");
*col_p = 24;
}
fprintf (stream, "%s", string);
*col_p += strlen (string);
*first_p = 0;
}
void
md_show_usage (FILE *stream)
{
int column, first;
size_t i;
fprintf (stream, _("\
MIPS options:\n\
-EB generate big endian output\n\
-EL generate little endian output\n\
-g, -g2 do not remove unneeded NOPs or swap branches\n\
-G NUM allow referencing objects up to NUM bytes\n\
implicitly with the gp register [default 8]\n"));
fprintf (stream, _("\
-mips1 generate MIPS ISA I instructions\n\
-mips2 generate MIPS ISA II instructions\n\
-mips3 generate MIPS ISA III instructions\n\
-mips4 generate MIPS ISA IV instructions\n\
-mips5 generate MIPS ISA V instructions\n\
-mips32 generate MIPS32 ISA instructions\n\
-mips32r2 generate MIPS32 release 2 ISA instructions\n\
-mips64 generate MIPS64 ISA instructions\n\
-mips64r2 generate MIPS64 release 2 ISA instructions\n\
-march=CPU/-mtune=CPU generate code/schedule for CPU, where CPU is one of:\n"));
first = 1;
for (i = 0; mips_cpu_info_table[i].name != NULL; i++)
show (stream, mips_cpu_info_table[i].name, &column, &first);
show (stream, "from-abi", &column, &first);
fputc ('\n', stream);
fprintf (stream, _("\
-mCPU equivalent to -march=CPU -mtune=CPU. Deprecated.\n\
-no-mCPU don't generate code specific to CPU.\n\
For -mCPU and -no-mCPU, CPU must be one of:\n"));
first = 1;
show (stream, "3900", &column, &first);
show (stream, "4010", &column, &first);
show (stream, "4100", &column, &first);
show (stream, "4650", &column, &first);
fputc ('\n', stream);
fprintf (stream, _("\
-mips16 generate mips16 instructions\n\
-no-mips16 do not generate mips16 instructions\n"));
fprintf (stream, _("\
-mfix-vr4120 work around certain VR4120 errata\n\
-mgp32 use 32-bit GPRs, regardless of the chosen ISA\n\
-mfp32 use 32-bit FPRs, regardless of the chosen ISA\n\
-O0 remove unneeded NOPs, do not swap branches\n\
-O remove unneeded NOPs and swap branches\n\
--[no-]construct-floats [dis]allow floating point values to be constructed\n\
--trap, --no-break trap exception on div by 0 and mult overflow\n\
--break, --no-trap break exception on div by 0 and mult overflow\n"));
#ifdef OBJ_ELF
fprintf (stream, _("\
-KPIC, -call_shared generate SVR4 position independent code\n\
-non_shared do not generate position independent code\n\
-xgot assume a 32 bit GOT\n\
-mpdr, -mno-pdr enable/disable creation of .pdr sections\n\
-mabi=ABI create ABI conformant object file for:\n"));
first = 1;
show (stream, "32", &column, &first);
show (stream, "o64", &column, &first);
show (stream, "n32", &column, &first);
show (stream, "64", &column, &first);
show (stream, "eabi", &column, &first);
fputc ('\n', stream);
fprintf (stream, _("\
-32 create o32 ABI object file (default)\n\
-n32 create n32 ABI object file\n\
-64 create 64 ABI object file\n"));
#endif
}
enum dwarf2_format
mips_dwarf2_format (void)
{
if (mips_abi == N64_ABI)
{
#ifdef TE_IRIX
return dwarf2_format_64bit_irix;
#else
return dwarf2_format_64bit;
#endif
}
else
return dwarf2_format_32bit;
}
int
mips_dwarf2_addr_size (void)
{
if (mips_abi == N64_ABI)
return 8;
else
return 4;
}
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