2019-05-23 19:05:12 +02:00
|
|
|
|
/* tc-bpf.c -- Assembler for the Linux eBPF.
|
|
|
|
|
Copyright (C) 2019 Free Software Foundation, Inc.
|
|
|
|
|
Contributed by Oracle, Inc.
|
|
|
|
|
|
|
|
|
|
This file is part of GAS, the GNU Assembler.
|
|
|
|
|
|
|
|
|
|
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 3, 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, 51 Franklin Street - Fifth Floor,
|
|
|
|
|
Boston, MA 02110-1301, USA. */
|
|
|
|
|
|
|
|
|
|
#include "as.h"
|
|
|
|
|
#include "subsegs.h"
|
|
|
|
|
#include "symcat.h"
|
|
|
|
|
#include "opcodes/bpf-desc.h"
|
|
|
|
|
#include "opcodes/bpf-opc.h"
|
|
|
|
|
#include "cgen.h"
|
|
|
|
|
#include "elf/common.h"
|
|
|
|
|
#include "elf/bpf.h"
|
|
|
|
|
#include "dwarf2dbg.h"
|
|
|
|
|
|
|
|
|
|
const char comment_chars[] = ";";
|
|
|
|
|
const char line_comment_chars[] = "#";
|
|
|
|
|
const char line_separator_chars[] = "`";
|
|
|
|
|
const char EXP_CHARS[] = "eE";
|
|
|
|
|
const char FLT_CHARS[] = "fFdD";
|
|
|
|
|
|
2019-07-19 15:35:02 +02:00
|
|
|
|
/* Like s_lcomm_internal in gas/read.c but the alignment string
|
|
|
|
|
is allowed to be optional. */
|
|
|
|
|
|
|
|
|
|
static symbolS *
|
|
|
|
|
pe_lcomm_internal (int needs_align, symbolS *symbolP, addressT size)
|
|
|
|
|
{
|
|
|
|
|
addressT align = 0;
|
|
|
|
|
|
|
|
|
|
SKIP_WHITESPACE ();
|
|
|
|
|
|
|
|
|
|
if (needs_align
|
|
|
|
|
&& *input_line_pointer == ',')
|
|
|
|
|
{
|
|
|
|
|
align = parse_align (needs_align - 1);
|
|
|
|
|
|
|
|
|
|
if (align == (addressT) -1)
|
|
|
|
|
return NULL;
|
|
|
|
|
}
|
|
|
|
|
else
|
|
|
|
|
{
|
|
|
|
|
if (size >= 8)
|
|
|
|
|
align = 3;
|
|
|
|
|
else if (size >= 4)
|
|
|
|
|
align = 2;
|
|
|
|
|
else if (size >= 2)
|
|
|
|
|
align = 1;
|
|
|
|
|
else
|
|
|
|
|
align = 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
bss_alloc (symbolP, size, align);
|
|
|
|
|
return symbolP;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
pe_lcomm (int needs_align)
|
|
|
|
|
{
|
|
|
|
|
s_comm_internal (needs_align * 2, pe_lcomm_internal);
|
|
|
|
|
}
|
|
|
|
|
|
2019-05-23 19:05:12 +02:00
|
|
|
|
/* The target specific pseudo-ops which we support. */
|
|
|
|
|
const pseudo_typeS md_pseudo_table[] =
|
|
|
|
|
{
|
2019-07-17 22:57:23 +02:00
|
|
|
|
{ "half", cons, 2 },
|
|
|
|
|
{ "word", cons, 4 },
|
|
|
|
|
{ "dword", cons, 8 },
|
2019-07-19 15:35:02 +02:00
|
|
|
|
{ "lcomm", pe_lcomm, 1 },
|
2019-07-17 23:18:41 +02:00
|
|
|
|
{ NULL, NULL, 0 }
|
2019-05-23 19:05:12 +02:00
|
|
|
|
};
|
|
|
|
|
|
2019-07-19 15:35:02 +02:00
|
|
|
|
|
|
|
|
|
|
2019-05-23 19:05:12 +02:00
|
|
|
|
/* ISA handling. */
|
|
|
|
|
static CGEN_BITSET *bpf_isa;
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* Command-line options processing. */
|
|
|
|
|
|
|
|
|
|
enum options
|
|
|
|
|
{
|
|
|
|
|
OPTION_LITTLE_ENDIAN = OPTION_MD_BASE,
|
|
|
|
|
OPTION_BIG_ENDIAN
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
struct option md_longopts[] =
|
|
|
|
|
{
|
|
|
|
|
{ "EL", no_argument, NULL, OPTION_LITTLE_ENDIAN },
|
|
|
|
|
{ "EB", no_argument, NULL, OPTION_BIG_ENDIAN },
|
|
|
|
|
{ NULL, no_argument, NULL, 0 },
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
size_t md_longopts_size = sizeof (md_longopts);
|
|
|
|
|
|
|
|
|
|
const char * md_shortopts = "";
|
|
|
|
|
|
|
|
|
|
extern int target_big_endian;
|
|
|
|
|
|
|
|
|
|
/* Whether target_big_endian has been set while parsing command-line
|
|
|
|
|
arguments. */
|
|
|
|
|
static int set_target_endian = 0;
|
|
|
|
|
|
|
|
|
|
int
|
|
|
|
|
md_parse_option (int c, const char * arg ATTRIBUTE_UNUSED)
|
|
|
|
|
{
|
|
|
|
|
switch (c)
|
|
|
|
|
{
|
|
|
|
|
case OPTION_BIG_ENDIAN:
|
|
|
|
|
set_target_endian = 1;
|
|
|
|
|
target_big_endian = 1;
|
|
|
|
|
break;
|
|
|
|
|
case OPTION_LITTLE_ENDIAN:
|
|
|
|
|
set_target_endian = 1;
|
|
|
|
|
target_big_endian = 0;
|
|
|
|
|
break;
|
|
|
|
|
default:
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
|
md_show_usage (FILE * stream)
|
|
|
|
|
{
|
|
|
|
|
fprintf (stream, _("\nBPF options:\n"));
|
|
|
|
|
fprintf (stream, _("\
|
|
|
|
|
--EL generate code for a little endian machine\n\
|
|
|
|
|
--EB generate code for a big endian machine\n"));
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
|
md_begin (void)
|
|
|
|
|
{
|
|
|
|
|
/* Initialize the `cgen' interface. */
|
|
|
|
|
|
|
|
|
|
/* If not specified in the command line, use the host
|
|
|
|
|
endianness. */
|
|
|
|
|
if (!set_target_endian)
|
|
|
|
|
{
|
|
|
|
|
#ifdef WORDS_BIGENDIAN
|
|
|
|
|
target_big_endian = 1;
|
|
|
|
|
#else
|
|
|
|
|
target_big_endian = 0;
|
|
|
|
|
#endif
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Set the ISA, which depends on the target endianness. */
|
|
|
|
|
bpf_isa = cgen_bitset_create (ISA_MAX);
|
|
|
|
|
if (target_big_endian)
|
|
|
|
|
cgen_bitset_set (bpf_isa, ISA_EBPFBE);
|
|
|
|
|
else
|
|
|
|
|
cgen_bitset_set (bpf_isa, ISA_EBPFLE);
|
|
|
|
|
|
|
|
|
|
/* Set the machine number and endian. */
|
|
|
|
|
gas_cgen_cpu_desc = bpf_cgen_cpu_open (CGEN_CPU_OPEN_ENDIAN,
|
|
|
|
|
target_big_endian ?
|
|
|
|
|
CGEN_ENDIAN_BIG : CGEN_ENDIAN_LITTLE,
|
|
|
|
|
CGEN_CPU_OPEN_ISAS,
|
|
|
|
|
bpf_isa,
|
|
|
|
|
CGEN_CPU_OPEN_END);
|
|
|
|
|
bpf_cgen_init_asm (gas_cgen_cpu_desc);
|
|
|
|
|
|
|
|
|
|
/* This is a callback from cgen to gas to parse operands. */
|
|
|
|
|
cgen_set_parse_operand_fn (gas_cgen_cpu_desc, gas_cgen_parse_operand);
|
|
|
|
|
|
|
|
|
|
/* Set the machine type. */
|
|
|
|
|
bfd_default_set_arch_mach (stdoutput, bfd_arch_bpf, bfd_mach_bpf);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
valueT
|
|
|
|
|
md_section_align (segT segment, valueT size)
|
|
|
|
|
{
|
bfd_section_* macros
This large patch removes the unnecessary bfd parameter from various
bfd section macros and functions. The bfd is hardly ever used and if
needed for the bfd_set_section_* or bfd_rename_section functions can
be found via section->owner except for the com, und, abs, and ind
std_section special sections. Those sections shouldn't be modified
anyway.
The patch also removes various bfd_get_section_<field> macros,
replacing their use with bfd_section_<field>, and adds
bfd_set_section_lma. I've also fixed a minor bug in gas where
compressed section renaming was done directly rather than calling
bfd_rename_section. This would have broken bfd_get_section_by_name
and similar functions, but that hardly mattered at such a late stage
in gas processing.
bfd/
* bfd-in.h (bfd_get_section_name, bfd_get_section_vma),
(bfd_get_section_lma, bfd_get_section_alignment),
(bfd_get_section_size, bfd_get_section_flags),
(bfd_get_section_userdata): Delete.
(bfd_section_name, bfd_section_size, bfd_section_vma),
(bfd_section_lma, bfd_section_alignment): Lose bfd parameter.
(bfd_section_flags, bfd_section_userdata): New.
(bfd_is_com_section): Rename parameter.
* section.c (bfd_set_section_userdata, bfd_set_section_vma),
(bfd_set_section_alignment, bfd_set_section_flags, bfd_rename_section),
(bfd_set_section_size): Delete bfd parameter, rename section parameter.
(bfd_set_section_lma): New.
* bfd-in2.h: Regenerate.
* mach-o.c (bfd_mach_o_init_section_from_mach_o): Delete bfd param,
update callers.
* aoutx.h, * bfd.c, * coff-alpha.c, * coff-arm.c, * coff-mips.c,
* coff64-rs6000.c, * coffcode.h, * coffgen.c, * cofflink.c,
* compress.c, * ecoff.c, * elf-eh-frame.c, * elf-hppa.h,
* elf-ifunc.c, * elf-m10200.c, * elf-m10300.c, * elf-properties.c,
* elf-s390-common.c, * elf-vxworks.c, * elf.c, * elf32-arc.c,
* elf32-arm.c, * elf32-avr.c, * elf32-bfin.c, * elf32-cr16.c,
* elf32-cr16c.c, * elf32-cris.c, * elf32-crx.c, * elf32-csky.c,
* elf32-d10v.c, * elf32-epiphany.c, * elf32-fr30.c, * elf32-frv.c,
* elf32-ft32.c, * elf32-h8300.c, * elf32-hppa.c, * elf32-i386.c,
* elf32-ip2k.c, * elf32-iq2000.c, * elf32-lm32.c, * elf32-m32c.c,
* elf32-m32r.c, * elf32-m68hc1x.c, * elf32-m68k.c, * elf32-mcore.c,
* elf32-mep.c, * elf32-metag.c, * elf32-microblaze.c,
* elf32-moxie.c, * elf32-msp430.c, * elf32-mt.c, * elf32-nds32.c,
* elf32-nios2.c, * elf32-or1k.c, * elf32-ppc.c, * elf32-pru.c,
* elf32-rl78.c, * elf32-rx.c, * elf32-s390.c, * elf32-score.c,
* elf32-score7.c, * elf32-sh.c, * elf32-spu.c, * elf32-tic6x.c,
* elf32-tilepro.c, * elf32-v850.c, * elf32-vax.c, * elf32-visium.c,
* elf32-xstormy16.c, * elf32-xtensa.c, * elf64-alpha.c,
* elf64-bpf.c, * elf64-hppa.c, * elf64-ia64-vms.c, * elf64-mmix.c,
* elf64-ppc.c, * elf64-s390.c, * elf64-sparc.c, * elf64-x86-64.c,
* elflink.c, * elfnn-aarch64.c, * elfnn-ia64.c, * elfnn-riscv.c,
* elfxx-aarch64.c, * elfxx-mips.c, * elfxx-sparc.c,
* elfxx-tilegx.c, * elfxx-x86.c, * i386msdos.c, * linker.c,
* mach-o.c, * mmo.c, * opncls.c, * pdp11.c, * pei-x86_64.c,
* peicode.h, * reloc.c, * section.c, * syms.c, * vms-alpha.c,
* xcofflink.c: Update throughout for bfd section macro and function
changes.
binutils/
* addr2line.c, * bucomm.c, * coffgrok.c, * dlltool.c, * nm.c,
* objcopy.c, * objdump.c, * od-elf32_avr.c, * od-macho.c,
* od-xcoff.c, * prdbg.c, * rdcoff.c, * rddbg.c, * rescoff.c,
* resres.c, * size.c, * srconv.c, * strings.c, * windmc.c: Update
throughout for bfd section macro and function changes.
gas/
* as.c, * as.h, * dw2gencfi.c, * dwarf2dbg.c, * ecoff.c,
* read.c, * stabs.c, * subsegs.c, * subsegs.h, * write.c,
* config/obj-coff-seh.c, * config/obj-coff.c, * config/obj-ecoff.c,
* config/obj-elf.c, * config/obj-macho.c, * config/obj-som.c,
* config/tc-aarch64.c, * config/tc-alpha.c, * config/tc-arc.c,
* config/tc-arm.c, * config/tc-avr.c, * config/tc-bfin.c,
* config/tc-bpf.c, * config/tc-d10v.c, * config/tc-d30v.c,
* config/tc-epiphany.c, * config/tc-fr30.c, * config/tc-frv.c,
* config/tc-h8300.c, * config/tc-hppa.c, * config/tc-i386.c,
* config/tc-ia64.c, * config/tc-ip2k.c, * config/tc-iq2000.c,
* config/tc-lm32.c, * config/tc-m32c.c, * config/tc-m32r.c,
* config/tc-m68hc11.c, * config/tc-mep.c, * config/tc-microblaze.c,
* config/tc-mips.c, * config/tc-mmix.c, * config/tc-mn10200.c,
* config/tc-mn10300.c, * config/tc-msp430.c, * config/tc-mt.c,
* config/tc-nds32.c, * config/tc-or1k.c, * config/tc-ppc.c,
* config/tc-pru.c, * config/tc-rl78.c, * config/tc-rx.c,
* config/tc-s12z.c, * config/tc-s390.c, * config/tc-score.c,
* config/tc-score7.c, * config/tc-sh.c, * config/tc-sparc.c,
* config/tc-spu.c, * config/tc-tic4x.c, * config/tc-tic54x.c,
* config/tc-tic6x.c, * config/tc-tilegx.c, * config/tc-tilepro.c,
* config/tc-v850.c, * config/tc-visium.c, * config/tc-wasm32.c,
* config/tc-xc16x.c, * config/tc-xgate.c, * config/tc-xstormy16.c,
* config/tc-xtensa.c, * config/tc-z8k.c: Update throughout for
bfd section macro and function changes.
* write.c (compress_debug): Use bfd_rename_section.
gdb/
* aarch64-linux-tdep.c, * arm-tdep.c, * auto-load.c,
* coff-pe-read.c, * coffread.c, * corelow.c, * dbxread.c,
* dicos-tdep.c, * dwarf2-frame.c, * dwarf2read.c, * elfread.c,
* exec.c, * fbsd-tdep.c, * gcore.c, * gdb_bfd.c, * gdb_bfd.h,
* hppa-tdep.c, * i386-cygwin-tdep.c, * i386-fbsd-tdep.c,
* i386-linux-tdep.c, * jit.c, * linux-tdep.c, * machoread.c,
* maint.c, * mdebugread.c, * minidebug.c, * mips-linux-tdep.c,
* mips-sde-tdep.c, * mips-tdep.c, * mipsread.c, * nto-tdep.c,
* objfiles.c, * objfiles.h, * osabi.c, * ppc-linux-tdep.c,
* ppc64-tdep.c, * record-btrace.c, * record-full.c, * remote.c,
* rs6000-aix-tdep.c, * rs6000-tdep.c, * s390-linux-tdep.c,
* s390-tdep.c, * solib-aix.c, * solib-dsbt.c, * solib-frv.c,
* solib-spu.c, * solib-svr4.c, * solib-target.c,
* spu-linux-nat.c, * spu-tdep.c, * symfile-mem.c, * symfile.c,
* symmisc.c, * symtab.c, * target.c, * windows-nat.c,
* xcoffread.c, * cli/cli-dump.c, * compile/compile-object-load.c,
* mi/mi-interp.c: Update throughout for bfd section macro and
function changes.
* gcore (gcore_create_callback): Use bfd_set_section_lma.
* spu-tdep.c (spu_overlay_new_objfile): Likewise.
gprof/
* corefile.c, * symtab.c: Update throughout for bfd section
macro and function changes.
ld/
* ldcref.c, * ldctor.c, * ldelf.c, * ldlang.c, * pe-dll.c,
* emultempl/aarch64elf.em, * emultempl/aix.em,
* emultempl/armcoff.em, * emultempl/armelf.em,
* emultempl/cr16elf.em, * emultempl/cskyelf.em,
* emultempl/m68hc1xelf.em, * emultempl/m68kelf.em,
* emultempl/mipself.em, * emultempl/mmix-elfnmmo.em,
* emultempl/mmo.em, * emultempl/msp430.em,
* emultempl/nios2elf.em, * emultempl/pe.em, * emultempl/pep.em,
* emultempl/ppc64elf.em, * emultempl/xtensaelf.em: Update
throughout for bfd section macro and function changes.
libctf/
* ctf-open-bfd.c: Update throughout for bfd section macro changes.
opcodes/
* arc-ext.c: Update throughout for bfd section macro changes.
sim/
* common/sim-load.c, * common/sim-utils.c, * cris/sim-if.c,
* erc32/func.c, * lm32/sim-if.c, * m32c/load.c, * m32c/trace.c,
* m68hc11/interp.c, * ppc/hw_htab.c, * ppc/hw_init.c,
* rl78/load.c, * rl78/trace.c, * rx/gdb-if.c, * rx/load.c,
* rx/trace.c: Update throughout for bfd section macro changes.
2019-09-16 12:55:17 +02:00
|
|
|
|
int align = bfd_section_alignment (segment);
|
2019-05-23 19:05:12 +02:00
|
|
|
|
|
|
|
|
|
return ((size + (1 << align) - 1) & -(1 << align));
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* Functions concerning relocs. */
|
|
|
|
|
|
|
|
|
|
/* The location from which a PC relative jump should be calculated,
|
|
|
|
|
given a PC relative reloc. */
|
|
|
|
|
|
|
|
|
|
long
|
|
|
|
|
md_pcrel_from_section (fixS *fixP, segT sec)
|
|
|
|
|
{
|
|
|
|
|
if (fixP->fx_addsy != (symbolS *) NULL
|
|
|
|
|
&& (! S_IS_DEFINED (fixP->fx_addsy)
|
|
|
|
|
|| (S_GET_SEGMENT (fixP->fx_addsy) != sec)
|
|
|
|
|
|| S_IS_EXTERNAL (fixP->fx_addsy)
|
|
|
|
|
|| S_IS_WEAK (fixP->fx_addsy)))
|
|
|
|
|
{
|
|
|
|
|
/* The symbol is undefined (or is defined but not in this section).
|
|
|
|
|
Let the linker figure it out. */
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return fixP->fx_where + fixP->fx_frag->fr_address;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Write a value out to the object file, using the appropriate endianness. */
|
|
|
|
|
|
|
|
|
|
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);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
arelent *
|
|
|
|
|
tc_gen_reloc (asection *sec, fixS *fix)
|
|
|
|
|
{
|
|
|
|
|
return gas_cgen_tc_gen_reloc (sec, fix);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Return the bfd reloc type for OPERAND of INSN at fixup FIXP. This
|
|
|
|
|
is called when the operand is an expression that couldn't be fully
|
|
|
|
|
resolved. Returns BFD_RELOC_NONE if no reloc type can be found.
|
|
|
|
|
*FIXP may be modified if desired. */
|
|
|
|
|
|
|
|
|
|
bfd_reloc_code_real_type
|
|
|
|
|
md_cgen_lookup_reloc (const CGEN_INSN *insn ATTRIBUTE_UNUSED,
|
|
|
|
|
const CGEN_OPERAND *operand,
|
|
|
|
|
fixS *fixP)
|
|
|
|
|
{
|
|
|
|
|
switch (operand->type)
|
|
|
|
|
{
|
|
|
|
|
case BPF_OPERAND_OFFSET16:
|
|
|
|
|
return BFD_RELOC_BPF_16;
|
|
|
|
|
case BPF_OPERAND_IMM32:
|
|
|
|
|
return BFD_RELOC_BPF_32;
|
|
|
|
|
case BPF_OPERAND_IMM64:
|
|
|
|
|
return BFD_RELOC_BPF_64;
|
|
|
|
|
case BPF_OPERAND_DISP16:
|
|
|
|
|
fixP->fx_pcrel = 1;
|
|
|
|
|
return BFD_RELOC_BPF_DISP16;
|
|
|
|
|
case BPF_OPERAND_DISP32:
|
|
|
|
|
fixP->fx_pcrel = 1;
|
|
|
|
|
return BFD_RELOC_BPF_DISP32;
|
|
|
|
|
default:
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
return BFD_RELOC_NONE;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* *FRAGP has been relaxed to its final size, and now needs to have
|
|
|
|
|
the bytes inside it modified to conform to the new size.
|
|
|
|
|
|
|
|
|
|
Called after relaxation is finished.
|
|
|
|
|
fragP->fr_type == rs_machine_dependent.
|
|
|
|
|
fragP->fr_subtype is the subtype of what the address relaxed to. */
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
|
md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED,
|
|
|
|
|
segT sec ATTRIBUTE_UNUSED,
|
|
|
|
|
fragS *fragP ATTRIBUTE_UNUSED)
|
|
|
|
|
{
|
|
|
|
|
as_fatal (_("convert_frag called"));
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int
|
|
|
|
|
md_estimate_size_before_relax (fragS *fragP ATTRIBUTE_UNUSED,
|
|
|
|
|
segT segment ATTRIBUTE_UNUSED)
|
|
|
|
|
{
|
|
|
|
|
as_fatal (_("estimate_size_before_relax called"));
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
|
md_apply_fix (fixS *fixP, valueT *valP, segT seg)
|
|
|
|
|
{
|
|
|
|
|
/* Some fixups for instructions require special attention. This is
|
|
|
|
|
handled in the code block below. */
|
|
|
|
|
if ((int) fixP->fx_r_type >= (int) BFD_RELOC_UNUSED)
|
|
|
|
|
{
|
|
|
|
|
int opindex = (int) fixP->fx_r_type - (int) BFD_RELOC_UNUSED;
|
|
|
|
|
const CGEN_OPERAND *operand = cgen_operand_lookup_by_num (gas_cgen_cpu_desc,
|
|
|
|
|
opindex);
|
|
|
|
|
char *where;
|
|
|
|
|
|
|
|
|
|
switch (operand->type)
|
|
|
|
|
{
|
|
|
|
|
case BPF_OPERAND_DISP32:
|
|
|
|
|
/* eBPF supports two kind of CALL instructions: the so
|
|
|
|
|
called pseudo calls ("bpf to bpf") and external calls
|
|
|
|
|
("bpf to kernel").
|
|
|
|
|
|
|
|
|
|
Both kind of calls use the same instruction (CALL).
|
|
|
|
|
However, external calls are constructed by passing a
|
|
|
|
|
constant argument to the instruction, whereas pseudo
|
|
|
|
|
calls result from expressions involving symbols. In
|
|
|
|
|
practice, instructions requiring a fixup are interpreted
|
|
|
|
|
as pseudo-calls. If we are executing this code, this is
|
|
|
|
|
a pseudo call.
|
|
|
|
|
|
|
|
|
|
The kernel expects for pseudo-calls to be annotated by
|
|
|
|
|
having BPF_PSEUDO_CALL in the SRC field of the
|
|
|
|
|
instruction. But beware the infamous nibble-swapping of
|
|
|
|
|
eBPF and take endianness into account here.
|
|
|
|
|
|
|
|
|
|
Note that the CALL instruction has only one operand, so
|
|
|
|
|
this code is executed only once per instruction. */
|
|
|
|
|
where = fixP->fx_frag->fr_literal + fixP->fx_where;
|
|
|
|
|
cgen_put_insn_value (gas_cgen_cpu_desc, (unsigned char *) where + 1, 8,
|
|
|
|
|
target_big_endian ? 0x01 : 0x10);
|
|
|
|
|
/* Fallthrough. */
|
|
|
|
|
case BPF_OPERAND_DISP16:
|
|
|
|
|
/* The PC-relative displacement fields in jump instructions
|
|
|
|
|
shouldn't be in bytes. Instead, they hold the number of
|
|
|
|
|
64-bit words to the target, _minus one_. */
|
|
|
|
|
*valP = (((long) (*valP)) - 8) / 8;
|
|
|
|
|
break;
|
|
|
|
|
default:
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* And now invoke CGEN's handler, which will eventually install
|
|
|
|
|
*valP into the corresponding operand. */
|
|
|
|
|
gas_cgen_md_apply_fix (fixP, valP, seg);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
|
md_assemble (char *str)
|
|
|
|
|
{
|
|
|
|
|
const CGEN_INSN *insn;
|
|
|
|
|
char *errmsg;
|
|
|
|
|
CGEN_FIELDS fields;
|
|
|
|
|
|
|
|
|
|
#if CGEN_INT_INSN_P
|
|
|
|
|
CGEN_INSN_INT buffer[CGEN_MAX_INSN_SIZE / sizeof (CGEN_INT_INSN_P)];
|
|
|
|
|
#else
|
|
|
|
|
unsigned char buffer[CGEN_MAX_INSN_SIZE];
|
|
|
|
|
memset (buffer, 0, CGEN_MAX_INSN_SIZE); /* XXX to remove when CGEN
|
|
|
|
|
is fixed to handle
|
|
|
|
|
opcodes-in-words
|
|
|
|
|
properly. */
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
gas_cgen_init_parse ();
|
|
|
|
|
insn = bpf_cgen_assemble_insn (gas_cgen_cpu_desc, str, &fields,
|
|
|
|
|
buffer, &errmsg);
|
|
|
|
|
|
|
|
|
|
if (insn == NULL)
|
|
|
|
|
{
|
|
|
|
|
as_bad ("%s", errmsg);
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
gas_cgen_finish_insn (insn, buffer, CGEN_FIELDS_BITSIZE (&fields),
|
|
|
|
|
0, /* zero to ban relaxable insns. */
|
|
|
|
|
NULL); /* NULL so results not returned here. */
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
|
md_operand (expressionS *expressionP)
|
|
|
|
|
{
|
|
|
|
|
gas_cgen_md_operand (expressionP);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
symbolS *
|
|
|
|
|
md_undefined_symbol (char *name ATTRIBUTE_UNUSED)
|
|
|
|
|
{
|
|
|
|
|
return NULL;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* 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. */
|
|
|
|
|
|
|
|
|
|
const char *
|
|
|
|
|
md_atof (int type, char *litP, int *sizeP)
|
|
|
|
|
{
|
|
|
|
|
return ieee_md_atof (type, litP, sizeP, FALSE);
|
|
|
|
|
}
|