a3a33af390
use a five instruction sequence for funtion calls which are out of range of the bal instruction. * libecoff.h (struct ecoff_section_tdata): Define. (ecoff_section_data): Define. (ecoff_bfd_relax_section): Don't define. * ecoff.c (ecoff_final_link_debug_accumulate): Don't read or free the debugging information if it has already been read. (ecoff_indirect_link_order): Handle _cooked_size being different from _raw_size. Don't reread the contents or the relocs if they have already been read in. * coff-mips.c (mips_howto_table): Change bitsize of PCREL16 from 18 to 16. (PCREL16_EXPANSION_ADJUSTMENT): Define. (mips_relocate_refhi): Take adjust argument. (mips_relocate_section): Handle reloc offsets stored in section used_by_bfd field. Call mips_relax_pcrel16 to handle details of expanding an out of range PCREL16. Keep trace of adjustments required by expansions. Set s and unset h when converting a reloc from undefined to section. Change handling of PC relative relocs: if against a section, they are correct in the object file, if against an external symbol they are pcrel_offset. (mips_relax_section): New function. (mips_relax_pcrel16): New function. (ecoff_bfd_relax_section): Define. * coff-alpha.c (ecoff_bfd_relax_section): Define. * ecofflink.c (bfd_ecoff_debug_accumulate): Handle adjustments built by mips_relax_section when writing out addresses. * elf32-mips.c (mips_elf_read_ecoff_info): Clear adjust field.
1711 lines
50 KiB
C
1711 lines
50 KiB
C
/* MIPS-specific support for 32-bit ELF
|
||
Copyright 1993, 1994 Free Software Foundation, Inc.
|
||
|
||
Most of the information added by Ian Lance Taylor, Cygnus Support,
|
||
<ian@cygnus.com>.
|
||
|
||
This file is part of BFD, the Binary File Descriptor library.
|
||
|
||
This program 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 of the License, or
|
||
(at your option) any later version.
|
||
|
||
This program 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 this program; if not, write to the Free Software
|
||
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
||
|
||
#include "bfd.h"
|
||
#include "sysdep.h"
|
||
#include "libbfd.h"
|
||
#include "bfdlink.h"
|
||
#include "genlink.h"
|
||
#include "libelf.h"
|
||
#include "elf/mips.h"
|
||
|
||
/* Get the ECOFF swapping routines. */
|
||
#include "coff/sym.h"
|
||
#include "coff/symconst.h"
|
||
#include "coff/internal.h"
|
||
#include "coff/ecoff.h"
|
||
#include "coff/mips.h"
|
||
#define ECOFF_32
|
||
#include "ecoffswap.h"
|
||
|
||
static bfd_reloc_status_type mips_elf_hi16_reloc PARAMS ((bfd *abfd,
|
||
arelent *reloc,
|
||
asymbol *symbol,
|
||
PTR data,
|
||
asection *section,
|
||
bfd *output_bfd,
|
||
char **error));
|
||
static bfd_reloc_status_type mips_elf_got16_reloc PARAMS ((bfd *abfd,
|
||
arelent *reloc,
|
||
asymbol *symbol,
|
||
PTR data,
|
||
asection *section,
|
||
bfd *output_bfd,
|
||
char **error));
|
||
static bfd_reloc_status_type mips_elf_lo16_reloc PARAMS ((bfd *abfd,
|
||
arelent *reloc,
|
||
asymbol *symbol,
|
||
PTR data,
|
||
asection *section,
|
||
bfd *output_bfd,
|
||
char **error));
|
||
static bfd_reloc_status_type mips_elf_gprel16_reloc PARAMS ((bfd *abfd,
|
||
arelent *reloc,
|
||
asymbol *symbol,
|
||
PTR data,
|
||
asection *section,
|
||
bfd *output_bfd,
|
||
char **error));
|
||
|
||
#define USE_REL 1 /* MIPS uses REL relocations instead of RELA */
|
||
|
||
enum reloc_type
|
||
{
|
||
R_MIPS_NONE = 0,
|
||
R_MIPS_16, R_MIPS_32,
|
||
R_MIPS_REL32, R_MIPS_26,
|
||
R_MIPS_HI16, R_MIPS_LO16,
|
||
R_MIPS_GPREL16, R_MIPS_LITERAL,
|
||
R_MIPS_GOT16, R_MIPS_PC16,
|
||
R_MIPS_CALL16, R_MIPS_GPREL32,
|
||
R_MIPS_max
|
||
};
|
||
|
||
static reloc_howto_type elf_mips_howto_table[] =
|
||
{
|
||
/* No relocation. */
|
||
HOWTO (R_MIPS_NONE, /* type */
|
||
0, /* rightshift */
|
||
0, /* size (0 = byte, 1 = short, 2 = long) */
|
||
0, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_dont, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_MIPS_NONE", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* 16 bit relocation. */
|
||
HOWTO (R_MIPS_16, /* type */
|
||
0, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_MIPS_16", /* name */
|
||
true, /* partial_inplace */
|
||
0xffff, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* 32 bit relocation. */
|
||
HOWTO (R_MIPS_32, /* type */
|
||
0, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
32, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_MIPS_32", /* name */
|
||
true, /* partial_inplace */
|
||
0xffffffff, /* src_mask */
|
||
0xffffffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* 32 bit symbol relative relocation. */
|
||
HOWTO (R_MIPS_REL32, /* type */
|
||
0, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
32, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_MIPS_REL32", /* name */
|
||
true, /* partial_inplace */
|
||
0xffffffff, /* src_mask */
|
||
0xffffffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* 26 bit branch address. */
|
||
HOWTO (R_MIPS_26, /* type */
|
||
2, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
26, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_dont, /* complain_on_overflow */
|
||
/* This needs complex overflow
|
||
detection, because the upper four
|
||
bits must match the PC. */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_MIPS_26", /* name */
|
||
true, /* partial_inplace */
|
||
0x3ffffff, /* src_mask */
|
||
0x3ffffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* High 16 bits of symbol value. */
|
||
HOWTO (R_MIPS_HI16, /* type */
|
||
0, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_dont, /* complain_on_overflow */
|
||
mips_elf_hi16_reloc, /* special_function */
|
||
"R_MIPS_HI16", /* name */
|
||
true, /* partial_inplace */
|
||
0xffff, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* Low 16 bits of symbol value. */
|
||
HOWTO (R_MIPS_LO16, /* type */
|
||
0, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_dont, /* complain_on_overflow */
|
||
mips_elf_lo16_reloc, /* special_function */
|
||
"R_MIPS_LO16", /* name */
|
||
true, /* partial_inplace */
|
||
0xffff, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* GP relative reference. */
|
||
HOWTO (R_MIPS_GPREL16, /* type */
|
||
0, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_signed, /* complain_on_overflow */
|
||
mips_elf_gprel16_reloc, /* special_function */
|
||
"R_MIPS_GPREL16", /* name */
|
||
true, /* partial_inplace */
|
||
0xffff, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* Reference to literal section. */
|
||
HOWTO (R_MIPS_LITERAL, /* type */
|
||
0, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_signed, /* complain_on_overflow */
|
||
mips_elf_gprel16_reloc, /* special_function */
|
||
"R_MIPS_LITERAL", /* name */
|
||
true, /* partial_inplace */
|
||
0xffff, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* Reference to global offset table. */
|
||
/* FIXME: This is not handled correctly. */
|
||
HOWTO (R_MIPS_GOT16, /* type */
|
||
0, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_signed, /* complain_on_overflow */
|
||
mips_elf_got16_reloc, /* special_function */
|
||
"R_MIPS_GOT16", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* 16 bit PC relative reference. */
|
||
HOWTO (R_MIPS_PC16, /* type */
|
||
0, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
true, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_signed, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_MIPS_PC16", /* name */
|
||
true, /* partial_inplace */
|
||
0xffff, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* 16 bit call through global offset table. */
|
||
/* FIXME: This is not handled correctly. */
|
||
HOWTO (R_MIPS_CALL16, /* type */
|
||
0, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_signed, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_MIPS_CALL16", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* 32 bit GP relative reference. */
|
||
/* FIXME: This is not handled correctly. */
|
||
HOWTO (R_MIPS_GPREL32, /* type */
|
||
0, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
32, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_MIPS_GPREL32", /* name */
|
||
true, /* partial_inplace */
|
||
0xffffffff, /* src_mask */
|
||
0xffffffff, /* dst_mask */
|
||
false) /* pcrel_offset */
|
||
};
|
||
|
||
/* Do a R_MIPS_HI16 relocation. This has to be done in combination
|
||
with a R_MIPS_LO16 reloc, because there is a carry from the LO16 to
|
||
the HI16. Here we just save the information we need; we do the
|
||
actual relocation when we see the LO16. MIPS ELF requires that the
|
||
LO16 immediately follow the HI16, so this ought to work. */
|
||
|
||
static bfd_byte *mips_hi16_addr;
|
||
static bfd_vma mips_hi16_addend;
|
||
|
||
static bfd_reloc_status_type
|
||
mips_elf_hi16_reloc (abfd,
|
||
reloc_entry,
|
||
symbol,
|
||
data,
|
||
input_section,
|
||
output_bfd,
|
||
error_message)
|
||
bfd *abfd;
|
||
arelent *reloc_entry;
|
||
asymbol *symbol;
|
||
PTR data;
|
||
asection *input_section;
|
||
bfd *output_bfd;
|
||
char **error_message;
|
||
{
|
||
bfd_reloc_status_type ret;
|
||
bfd_vma relocation;
|
||
|
||
/* If we're relocating, and this an external symbol, we don't want
|
||
to change anything. */
|
||
if (output_bfd != (bfd *) NULL
|
||
&& (symbol->flags & BSF_SECTION_SYM) == 0
|
||
&& reloc_entry->addend == 0)
|
||
{
|
||
reloc_entry->address += input_section->output_offset;
|
||
return bfd_reloc_ok;
|
||
}
|
||
|
||
/* FIXME: The symbol _gp_disp requires special handling, which we do
|
||
not do. */
|
||
if (strcmp (bfd_asymbol_name (symbol), "_gp_disp") == 0)
|
||
abort ();
|
||
|
||
ret = bfd_reloc_ok;
|
||
if (symbol->section == &bfd_und_section
|
||
&& output_bfd == (bfd *) NULL)
|
||
ret = bfd_reloc_undefined;
|
||
|
||
if (bfd_is_com_section (symbol->section))
|
||
relocation = 0;
|
||
else
|
||
relocation = symbol->value;
|
||
|
||
relocation += symbol->section->output_section->vma;
|
||
relocation += symbol->section->output_offset;
|
||
relocation += reloc_entry->addend;
|
||
|
||
if (reloc_entry->address > input_section->_cooked_size)
|
||
return bfd_reloc_outofrange;
|
||
|
||
/* Save the information, and let LO16 do the actual relocation. */
|
||
mips_hi16_addr = (bfd_byte *) data + reloc_entry->address;
|
||
mips_hi16_addend = relocation;
|
||
|
||
if (output_bfd != (bfd *) NULL)
|
||
reloc_entry->address += input_section->output_offset;
|
||
|
||
return ret;
|
||
}
|
||
|
||
/* Do a R_MIPS_LO16 relocation. This is a straightforward 16 bit
|
||
inplace relocation; this function exists in order to do the
|
||
R_MIPS_HI16 relocation described above. */
|
||
|
||
static bfd_reloc_status_type
|
||
mips_elf_lo16_reloc (abfd,
|
||
reloc_entry,
|
||
symbol,
|
||
data,
|
||
input_section,
|
||
output_bfd,
|
||
error_message)
|
||
bfd *abfd;
|
||
arelent *reloc_entry;
|
||
asymbol *symbol;
|
||
PTR data;
|
||
asection *input_section;
|
||
bfd *output_bfd;
|
||
char **error_message;
|
||
{
|
||
/* FIXME: The symbol _gp_disp requires special handling, which we do
|
||
not do. */
|
||
if (output_bfd == (bfd *) NULL
|
||
&& strcmp (bfd_asymbol_name (symbol), "_gp_disp") == 0)
|
||
abort ();
|
||
|
||
if (mips_hi16_addr != (bfd_byte *) NULL)
|
||
{
|
||
unsigned long insn;
|
||
unsigned long val;
|
||
unsigned long vallo;
|
||
|
||
/* Do the HI16 relocation. Note that we actually don't need to
|
||
know anything about the LO16 itself, except where to find the
|
||
low 16 bits of the addend needed by the LO16. */
|
||
insn = bfd_get_32 (abfd, mips_hi16_addr);
|
||
vallo = (bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address)
|
||
& 0xffff);
|
||
val = ((insn & 0xffff) << 16) + vallo;
|
||
val += mips_hi16_addend;
|
||
|
||
/* The low order 16 bits are always treated as a signed value.
|
||
Therefore, a negative value in the low order bits requires an
|
||
adjustment in the high order bits. We need to make this
|
||
adjustment in two ways: once for the bits we took from the
|
||
data, and once for the bits we are putting back in to the
|
||
data. */
|
||
if ((vallo & 0x8000) != 0)
|
||
val -= 0x10000;
|
||
if ((val & 0x8000) != 0)
|
||
val += 0x10000;
|
||
|
||
insn = (insn &~ 0xffff) | ((val >> 16) & 0xffff);
|
||
bfd_put_32 (abfd, insn, mips_hi16_addr);
|
||
|
||
mips_hi16_addr = (bfd_byte *) NULL;
|
||
}
|
||
|
||
/* Now do the LO16 reloc in the usual way. */
|
||
return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
|
||
input_section, output_bfd, error_message);
|
||
}
|
||
|
||
/* Do a R_MIPS_GOT16 reloc. This is a reloc against the global offset
|
||
table used for PIC code. If the symbol is an external symbol, the
|
||
instruction is modified to contain the offset of the appropriate
|
||
entry in the global offset table. If the symbol is a section
|
||
symbol, the next reloc is a R_MIPS_LO16 reloc. The two 16 bit
|
||
addends are combined to form the real addend against the section
|
||
symbol; the GOT16 is modified to contain the offset of an entry in
|
||
the global offset table, and the LO16 is modified to offset it
|
||
appropriately. Thus an offset larger than 16 bits requires a
|
||
modified value in the global offset table.
|
||
|
||
This implementation suffices for the assembler, but the linker does
|
||
not yet know how to create global offset tables. */
|
||
|
||
static bfd_reloc_status_type
|
||
mips_elf_got16_reloc (abfd,
|
||
reloc_entry,
|
||
symbol,
|
||
data,
|
||
input_section,
|
||
output_bfd,
|
||
error_message)
|
||
bfd *abfd;
|
||
arelent *reloc_entry;
|
||
asymbol *symbol;
|
||
PTR data;
|
||
asection *input_section;
|
||
bfd *output_bfd;
|
||
char **error_message;
|
||
{
|
||
/* If we're relocating, and this an external symbol, we don't want
|
||
to change anything. */
|
||
if (output_bfd != (bfd *) NULL
|
||
&& (symbol->flags & BSF_SECTION_SYM) == 0
|
||
&& reloc_entry->addend == 0)
|
||
{
|
||
reloc_entry->address += input_section->output_offset;
|
||
return bfd_reloc_ok;
|
||
}
|
||
|
||
/* If we're relocating, and this is a local symbol, we can handle it
|
||
just like HI16. */
|
||
if (output_bfd != (bfd *) NULL
|
||
&& (symbol->flags & BSF_SECTION_SYM) != 0)
|
||
return mips_elf_hi16_reloc (abfd, reloc_entry, symbol, data,
|
||
input_section, output_bfd, error_message);
|
||
|
||
abort ();
|
||
}
|
||
|
||
/* Do a R_MIPS_GPREL16 relocation. This is a 16 bit value which must
|
||
become the offset from the gp register. This function also handles
|
||
R_MIPS_LITERAL relocations, although those can be handled more
|
||
cleverly because the entries in the .lit8 and .lit4 sections can be
|
||
merged. */
|
||
|
||
static bfd_reloc_status_type
|
||
mips_elf_gprel16_reloc (abfd,
|
||
reloc_entry,
|
||
symbol,
|
||
data,
|
||
input_section,
|
||
output_bfd,
|
||
error_message)
|
||
bfd *abfd;
|
||
arelent *reloc_entry;
|
||
asymbol *symbol;
|
||
PTR data;
|
||
asection *input_section;
|
||
bfd *output_bfd;
|
||
char **error_message;
|
||
{
|
||
boolean relocateable;
|
||
bfd_vma relocation;
|
||
unsigned long val;
|
||
unsigned long insn;
|
||
|
||
/* If we're relocating, and this is an external symbol with no
|
||
addend, we don't want to change anything. We will only have an
|
||
addend if this is a newly created reloc, not read from an ELF
|
||
file. */
|
||
if (output_bfd != (bfd *) NULL
|
||
&& (symbol->flags & BSF_SECTION_SYM) == 0
|
||
&& reloc_entry->addend == 0)
|
||
{
|
||
reloc_entry->address += input_section->output_offset;
|
||
return bfd_reloc_ok;
|
||
}
|
||
|
||
if (output_bfd != (bfd *) NULL)
|
||
relocateable = true;
|
||
else
|
||
{
|
||
relocateable = false;
|
||
output_bfd = symbol->section->output_section->owner;
|
||
}
|
||
|
||
if (symbol->section == &bfd_und_section
|
||
&& relocateable == false)
|
||
return bfd_reloc_undefined;
|
||
|
||
/* We have to figure out the gp value, so that we can adjust the
|
||
symbol value correctly. We look up the symbol _gp in the output
|
||
BFD. If we can't find it, we're stuck. We cache it in the ELF
|
||
target data. We don't need to adjust the symbol value for an
|
||
external symbol if we are producing relocateable output. */
|
||
if (elf_gp (output_bfd) == 0
|
||
&& (relocateable == false
|
||
|| (symbol->flags & BSF_SECTION_SYM) != 0))
|
||
{
|
||
if (relocateable != false)
|
||
{
|
||
/* Make up a value. */
|
||
elf_gp (output_bfd) =
|
||
symbol->section->output_section->vma + 0x4000;
|
||
}
|
||
else
|
||
{
|
||
unsigned int count;
|
||
asymbol **sym;
|
||
unsigned int i;
|
||
|
||
count = bfd_get_symcount (output_bfd);
|
||
sym = bfd_get_outsymbols (output_bfd);
|
||
|
||
if (sym == (asymbol **) NULL)
|
||
i = count;
|
||
else
|
||
{
|
||
for (i = 0; i < count; i++, sym++)
|
||
{
|
||
register CONST char *name;
|
||
|
||
name = bfd_asymbol_name (*sym);
|
||
if (*name == '_' && strcmp (name, "_gp") == 0)
|
||
{
|
||
elf_gp (output_bfd) = bfd_asymbol_value (*sym);
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (i >= count)
|
||
{
|
||
/* Only get the error once. */
|
||
elf_gp (output_bfd) = 4;
|
||
*error_message =
|
||
(char *) "GP relative relocation when _gp not defined";
|
||
return bfd_reloc_dangerous;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (bfd_is_com_section (symbol->section))
|
||
relocation = 0;
|
||
else
|
||
relocation = symbol->value;
|
||
|
||
relocation += symbol->section->output_section->vma;
|
||
relocation += symbol->section->output_offset;
|
||
|
||
if (reloc_entry->address > input_section->_cooked_size)
|
||
return bfd_reloc_outofrange;
|
||
|
||
insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
|
||
|
||
/* Set val to the offset into the section or symbol. */
|
||
val = ((insn & 0xffff) + reloc_entry->addend) & 0xffff;
|
||
if (val & 0x8000)
|
||
val -= 0x10000;
|
||
|
||
/* Adjust val for the final section location and GP value. If we
|
||
are producing relocateable output, we don't want to do this for
|
||
an external symbol. */
|
||
if (relocateable == false
|
||
|| (symbol->flags & BSF_SECTION_SYM) != 0)
|
||
val += relocation - elf_gp (output_bfd);
|
||
|
||
insn = (insn &~ 0xffff) | (val & 0xffff);
|
||
bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address);
|
||
|
||
if (relocateable != false)
|
||
reloc_entry->address += input_section->output_offset;
|
||
|
||
/* Make sure it fit in 16 bits. */
|
||
if (val >= 0x8000 && val < 0xffff8000)
|
||
return bfd_reloc_overflow;
|
||
|
||
return bfd_reloc_ok;
|
||
}
|
||
|
||
/* A mapping from BFD reloc types to MIPS ELF reloc types. */
|
||
|
||
struct elf_reloc_map {
|
||
bfd_reloc_code_real_type bfd_reloc_val;
|
||
enum reloc_type elf_reloc_val;
|
||
};
|
||
|
||
static CONST struct elf_reloc_map mips_reloc_map[] =
|
||
{
|
||
{ BFD_RELOC_NONE, R_MIPS_NONE, },
|
||
{ BFD_RELOC_16, R_MIPS_16 },
|
||
{ BFD_RELOC_32, R_MIPS_32 },
|
||
{ BFD_RELOC_CTOR, R_MIPS_32 },
|
||
{ BFD_RELOC_32_PCREL, R_MIPS_REL32 },
|
||
{ BFD_RELOC_MIPS_JMP, R_MIPS_26 },
|
||
{ BFD_RELOC_HI16_S, R_MIPS_HI16 },
|
||
{ BFD_RELOC_LO16, R_MIPS_LO16 },
|
||
{ BFD_RELOC_MIPS_GPREL, R_MIPS_GPREL16 },
|
||
{ BFD_RELOC_MIPS_LITERAL, R_MIPS_LITERAL },
|
||
{ BFD_RELOC_MIPS_GOT16, R_MIPS_GOT16 },
|
||
{ BFD_RELOC_16_PCREL, R_MIPS_PC16 },
|
||
{ BFD_RELOC_MIPS_CALL16, R_MIPS_CALL16 },
|
||
{ BFD_RELOC_MIPS_GPREL32, R_MIPS_GPREL32 }
|
||
};
|
||
|
||
/* Given a BFD reloc type, return a howto structure. */
|
||
|
||
static CONST struct reloc_howto_struct *
|
||
bfd_elf32_bfd_reloc_type_lookup (abfd, code)
|
||
bfd *abfd;
|
||
bfd_reloc_code_real_type code;
|
||
{
|
||
int i;
|
||
|
||
for (i = 0; i < sizeof (mips_reloc_map) / sizeof (struct elf_reloc_map); i++)
|
||
{
|
||
if (mips_reloc_map[i].bfd_reloc_val == code)
|
||
return &elf_mips_howto_table[(int) mips_reloc_map[i].elf_reloc_val];
|
||
}
|
||
return NULL;
|
||
}
|
||
|
||
/* Given a MIPS reloc type, fill in an arelent structure. */
|
||
|
||
static void
|
||
mips_info_to_howto_rel (abfd, cache_ptr, dst)
|
||
bfd *abfd;
|
||
arelent *cache_ptr;
|
||
Elf32_Internal_Rel *dst;
|
||
{
|
||
unsigned int r_type;
|
||
|
||
r_type = ELF32_R_TYPE (dst->r_info);
|
||
BFD_ASSERT (r_type < (unsigned int) R_MIPS_max);
|
||
cache_ptr->howto = &elf_mips_howto_table[r_type];
|
||
|
||
/* The addend for a GPREL16 or LITERAL relocation comes from the GP
|
||
value for the object file. We get the addend now, rather than
|
||
when we do the relocation, because the symbol manipulations done
|
||
by the linker may cause us to lose track of the input BFD. */
|
||
if (((*cache_ptr->sym_ptr_ptr)->flags & BSF_SECTION_SYM) != 0
|
||
&& (r_type == (unsigned int) R_MIPS_GPREL16
|
||
|| r_type == (unsigned int) R_MIPS_LITERAL))
|
||
cache_ptr->addend = elf_gp (abfd);
|
||
}
|
||
|
||
/* A .reginfo section holds a single Elf32_RegInfo structure. These
|
||
routines swap this structure in and out. They are used outside of
|
||
BFD, so they are globally visible. */
|
||
|
||
void
|
||
bfd_mips_elf32_swap_reginfo_in (abfd, ex, in)
|
||
bfd *abfd;
|
||
const Elf32_External_RegInfo *ex;
|
||
Elf32_RegInfo *in;
|
||
{
|
||
in->ri_gprmask = bfd_h_get_32 (abfd, (bfd_byte *) ex->ri_gprmask);
|
||
in->ri_cprmask[0] = bfd_h_get_32 (abfd, (bfd_byte *) ex->ri_cprmask[0]);
|
||
in->ri_cprmask[1] = bfd_h_get_32 (abfd, (bfd_byte *) ex->ri_cprmask[1]);
|
||
in->ri_cprmask[2] = bfd_h_get_32 (abfd, (bfd_byte *) ex->ri_cprmask[2]);
|
||
in->ri_cprmask[3] = bfd_h_get_32 (abfd, (bfd_byte *) ex->ri_cprmask[3]);
|
||
in->ri_gp_value = bfd_h_get_32 (abfd, (bfd_byte *) ex->ri_gp_value);
|
||
}
|
||
|
||
void
|
||
bfd_mips_elf32_swap_reginfo_out (abfd, in, ex)
|
||
bfd *abfd;
|
||
const Elf32_RegInfo *in;
|
||
Elf32_External_RegInfo *ex;
|
||
{
|
||
bfd_h_put_32 (abfd, (bfd_vma) in->ri_gprmask,
|
||
(bfd_byte *) ex->ri_gprmask);
|
||
bfd_h_put_32 (abfd, (bfd_vma) in->ri_cprmask[0],
|
||
(bfd_byte *) ex->ri_cprmask[0]);
|
||
bfd_h_put_32 (abfd, (bfd_vma) in->ri_cprmask[1],
|
||
(bfd_byte *) ex->ri_cprmask[1]);
|
||
bfd_h_put_32 (abfd, (bfd_vma) in->ri_cprmask[2],
|
||
(bfd_byte *) ex->ri_cprmask[2]);
|
||
bfd_h_put_32 (abfd, (bfd_vma) in->ri_cprmask[3],
|
||
(bfd_byte *) ex->ri_cprmask[3]);
|
||
bfd_h_put_32 (abfd, (bfd_vma) in->ri_gp_value,
|
||
(bfd_byte *) ex->ri_gp_value);
|
||
}
|
||
|
||
/* Determine whether a symbol is global for the purposes of splitting
|
||
the symbol table into global symbols and local symbols. At least
|
||
on Irix 5, this split must be between section symbols and all other
|
||
symbols. On most ELF targets the split is between static symbols
|
||
and externally visible symbols. */
|
||
|
||
/*ARGSUSED*/
|
||
static boolean
|
||
mips_elf_sym_is_global (abfd, sym)
|
||
bfd *abfd;
|
||
asymbol *sym;
|
||
{
|
||
return (sym->flags & BSF_SECTION_SYM) == 0 ? true : false;
|
||
}
|
||
|
||
/* Set the right machine number for a MIPS ELF file. */
|
||
|
||
static boolean
|
||
mips_elf_object_p (abfd)
|
||
bfd *abfd;
|
||
{
|
||
switch (elf_elfheader (abfd)->e_flags & EF_MIPS_ARCH)
|
||
{
|
||
default:
|
||
case E_MIPS_ARCH_1:
|
||
/* Just use the default, which was set in elfcode.h. */
|
||
break;
|
||
|
||
case E_MIPS_ARCH_2:
|
||
(void) bfd_default_set_arch_mach (abfd, bfd_arch_mips, 6000);
|
||
break;
|
||
|
||
case E_MIPS_ARCH_3:
|
||
(void) bfd_default_set_arch_mach (abfd, bfd_arch_mips, 4000);
|
||
break;
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* The final processing done just before writing out a MIPS ELF object
|
||
file. This gets the MIPS architecture right based on the machine
|
||
number. */
|
||
|
||
static void
|
||
mips_elf_final_write_processing (abfd)
|
||
bfd *abfd;
|
||
{
|
||
unsigned long val;
|
||
|
||
switch (bfd_get_mach (abfd))
|
||
{
|
||
case 3000:
|
||
val = E_MIPS_ARCH_1;
|
||
break;
|
||
|
||
case 6000:
|
||
val = E_MIPS_ARCH_2;
|
||
break;
|
||
|
||
case 4000:
|
||
val = E_MIPS_ARCH_3;
|
||
break;
|
||
|
||
default:
|
||
return;
|
||
}
|
||
|
||
elf_elfheader (abfd)->e_flags &=~ EF_MIPS_ARCH;
|
||
elf_elfheader (abfd)->e_flags |= val;
|
||
}
|
||
|
||
/* Handle a MIPS specific section when reading an object file. This
|
||
is called when elfcode.h finds a section with an unknown type.
|
||
FIXME: We need to handle the SHF_MIPS_GPREL flag, but I'm not sure
|
||
how to. */
|
||
|
||
static boolean
|
||
mips_elf_section_from_shdr (abfd, hdr, name)
|
||
bfd *abfd;
|
||
Elf32_Internal_Shdr *hdr;
|
||
char *name;
|
||
{
|
||
/* There ought to be a place to keep ELF backend specific flags, but
|
||
at the moment there isn't one. We just keep track of the
|
||
sections by their name, instead. Fortunately, the ABI gives
|
||
suggested names for all the MIPS specific sections, so we will
|
||
probably get away with this. */
|
||
switch (hdr->sh_type)
|
||
{
|
||
case SHT_MIPS_LIBLIST:
|
||
if (strcmp (name, ".liblist") != 0)
|
||
return false;
|
||
break;
|
||
case SHT_MIPS_CONFLICT:
|
||
if (strcmp (name, ".conflict") != 0)
|
||
return false;
|
||
break;
|
||
case SHT_MIPS_GPTAB:
|
||
if (strncmp (name, ".gptab.", sizeof ".gptab." - 1) != 0)
|
||
return false;
|
||
break;
|
||
case SHT_MIPS_UCODE:
|
||
if (strcmp (name, ".ucode") != 0)
|
||
return false;
|
||
break;
|
||
case SHT_MIPS_DEBUG:
|
||
if (strcmp (name, ".mdebug") != 0)
|
||
return false;
|
||
break;
|
||
case SHT_MIPS_REGINFO:
|
||
if (strcmp (name, ".reginfo") != 0
|
||
|| hdr->sh_size != sizeof (Elf32_External_RegInfo))
|
||
return false;
|
||
break;
|
||
case SHT_MIPS_OPTIONS:
|
||
if (strcmp (name, ".options") != 0)
|
||
return false;
|
||
break;
|
||
default:
|
||
return false;
|
||
}
|
||
|
||
if (hdr->rawdata == NULL)
|
||
{
|
||
asection *newsect;
|
||
|
||
newsect = bfd_make_section (abfd, name);
|
||
if (newsect != NULL)
|
||
{
|
||
newsect->filepos = hdr->sh_offset;
|
||
newsect->flags |= SEC_HAS_CONTENTS;
|
||
newsect->vma = hdr->sh_addr;
|
||
newsect->_raw_size = hdr->sh_size;
|
||
newsect->alignment_power = bfd_log2 (hdr->sh_addralign);
|
||
|
||
if (hdr->sh_flags & SHF_ALLOC)
|
||
{
|
||
newsect->flags |= SEC_ALLOC;
|
||
newsect->flags |= SEC_LOAD;
|
||
}
|
||
|
||
if (!(hdr->sh_flags & SHF_WRITE))
|
||
newsect->flags |= SEC_READONLY;
|
||
|
||
if (hdr->sh_flags & SHF_EXECINSTR)
|
||
newsect->flags |= SEC_CODE;
|
||
else if (newsect->flags & SEC_ALLOC)
|
||
newsect->flags |= SEC_DATA;
|
||
|
||
if (hdr->sh_type == SHT_MIPS_DEBUG)
|
||
newsect->flags |= SEC_DEBUGGING;
|
||
|
||
hdr->rawdata = (void *) newsect;
|
||
|
||
/* FIXME: We should record the sh_info field for a .gptab
|
||
section. */
|
||
|
||
/* For a .reginfo section, set the gp value in the tdata
|
||
information from the contents of this section. We need
|
||
the gp value while processing relocs, so we just get it
|
||
now. */
|
||
if (hdr->sh_type == SHT_MIPS_REGINFO)
|
||
{
|
||
Elf32_External_RegInfo ext;
|
||
Elf32_RegInfo s;
|
||
|
||
if (bfd_get_section_contents (abfd, newsect, (PTR) &ext,
|
||
(file_ptr) 0,
|
||
sizeof ext) == false)
|
||
return false;
|
||
bfd_mips_elf32_swap_reginfo_in (abfd, &ext, &s);
|
||
elf_gp (abfd) = s.ri_gp_value;
|
||
}
|
||
}
|
||
else
|
||
hdr->rawdata = (void *) bfd_get_section_by_name (abfd, name);
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Set the correct type for a MIPS ELF section. We do this by the
|
||
section name, which is a hack, but ought to work. */
|
||
|
||
static boolean
|
||
mips_elf_fake_sections (abfd, hdr, sec)
|
||
bfd *abfd;
|
||
Elf32_Internal_Shdr *hdr;
|
||
asection *sec;
|
||
{
|
||
register const char *name;
|
||
|
||
name = bfd_get_section_name (abfd, sec);
|
||
|
||
if (strcmp (name, ".liblist") == 0)
|
||
{
|
||
hdr->sh_type = SHT_MIPS_LIBLIST;
|
||
hdr->sh_info = sec->_raw_size / sizeof (Elf32_Lib);
|
||
/* FIXME: Set the sh_link field. */
|
||
}
|
||
else if (strcmp (name, ".conflict") == 0)
|
||
hdr->sh_type = SHT_MIPS_CONFLICT;
|
||
else if (strncmp (name, ".gptab.", sizeof ".gptab." - 1) == 0)
|
||
{
|
||
hdr->sh_type = SHT_MIPS_GPTAB;
|
||
/* FIXME: Set the sh_info field. */
|
||
}
|
||
else if (strcmp (name, ".ucode") == 0)
|
||
hdr->sh_type = SHT_MIPS_UCODE;
|
||
else if (strcmp (name, ".mdebug") == 0)
|
||
{
|
||
hdr->sh_type = SHT_MIPS_DEBUG;
|
||
hdr->sh_entsize = 1;
|
||
}
|
||
else if (strcmp (name, ".reginfo") == 0)
|
||
{
|
||
hdr->sh_type = SHT_MIPS_REGINFO;
|
||
hdr->sh_entsize = 1;
|
||
|
||
/* Force the section size to the correct value, even if the
|
||
linker thinks it is larger. The link routine below will only
|
||
write out this much data for .reginfo. */
|
||
hdr->sh_size = sec->_raw_size = sizeof (Elf32_External_RegInfo);
|
||
}
|
||
else if (strcmp (name, ".options") == 0)
|
||
{
|
||
hdr->sh_type = SHT_MIPS_OPTIONS;
|
||
hdr->sh_entsize = 1;
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Given a BFD section, try to locate the corresponding ELF section
|
||
index. */
|
||
|
||
static boolean
|
||
mips_elf_section_from_bfd_section (abfd, hdr, sec, retval)
|
||
bfd *abfd;
|
||
Elf32_Internal_Shdr *hdr;
|
||
asection *sec;
|
||
int *retval;
|
||
{
|
||
if (strcmp (bfd_get_section_name (abfd, sec), ".scommon") == 0)
|
||
{
|
||
*retval = SHN_MIPS_SCOMMON;
|
||
return true;
|
||
}
|
||
if ((asection *) hdr->rawdata == sec)
|
||
return true;
|
||
return false;
|
||
}
|
||
|
||
/* Work over a section just before writing it out. We update the GP
|
||
value in the .reginfo section based on the value we are using.
|
||
FIXME: We recognize sections that need the SHF_MIPS_GPREL flag by
|
||
name; there has to be a better way. */
|
||
|
||
static boolean
|
||
mips_elf_section_processing (abfd, hdr)
|
||
bfd *abfd;
|
||
Elf32_Internal_Shdr *hdr;
|
||
{
|
||
if (hdr->sh_type == SHT_MIPS_REGINFO)
|
||
{
|
||
bfd_byte buf[4];
|
||
|
||
BFD_ASSERT (hdr->sh_size == sizeof (Elf32_External_RegInfo));
|
||
BFD_ASSERT (hdr->contents == NULL);
|
||
|
||
if (bfd_seek (abfd,
|
||
hdr->sh_offset + sizeof (Elf32_External_RegInfo) - 4,
|
||
SEEK_SET) == -1)
|
||
return false;
|
||
bfd_h_put_32 (abfd, (bfd_vma) elf_gp (abfd), buf);
|
||
if (bfd_write (buf, (bfd_size_type) 1, (bfd_size_type) 4, abfd) != 4)
|
||
return false;
|
||
}
|
||
|
||
if (hdr->rawdata != NULL)
|
||
{
|
||
const char *name = ((asection *) hdr->rawdata)->name;
|
||
|
||
if (strcmp (name, ".sdata") == 0)
|
||
{
|
||
hdr->sh_flags |= SHF_ALLOC | SHF_WRITE | SHF_MIPS_GPREL;
|
||
hdr->sh_type = SHT_PROGBITS;
|
||
}
|
||
else if (strcmp (name, ".sbss") == 0)
|
||
{
|
||
hdr->sh_flags |= SHF_ALLOC | SHF_WRITE | SHF_MIPS_GPREL;
|
||
hdr->sh_type = SHT_NOBITS;
|
||
}
|
||
else if (strcmp (name, ".lit8") == 0
|
||
|| strcmp (name, ".lit4") == 0)
|
||
{
|
||
hdr->sh_flags |= SHF_ALLOC | SHF_WRITE | SHF_MIPS_GPREL;
|
||
hdr->sh_type = SHT_PROGBITS;
|
||
}
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Read ECOFF debugging information from a .mdebug section into a
|
||
ecoff_debug_info structure. */
|
||
|
||
static boolean
|
||
mips_elf_read_ecoff_info (abfd, section, debug)
|
||
bfd *abfd;
|
||
asection *section;
|
||
struct ecoff_debug_info *debug;
|
||
{
|
||
HDRR *symhdr;
|
||
const struct ecoff_debug_swap *swap;
|
||
char *ext_hdr = NULL;
|
||
|
||
swap = get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap;
|
||
|
||
ext_hdr = (char *) malloc (swap->external_hdr_size);
|
||
if (ext_hdr == NULL && swap->external_hdr_size != 0)
|
||
{
|
||
bfd_set_error (bfd_error_no_memory);
|
||
goto error_return;
|
||
}
|
||
|
||
if (bfd_get_section_contents (abfd, section, ext_hdr, (file_ptr) 0,
|
||
swap->external_hdr_size)
|
||
== false)
|
||
goto error_return;
|
||
|
||
symhdr = &debug->symbolic_header;
|
||
(*swap->swap_hdr_in) (abfd, ext_hdr, symhdr);
|
||
|
||
/* The symbolic header contains absolute file offsets and sizes to
|
||
read. */
|
||
#define READ(ptr, offset, count, size, type) \
|
||
if (symhdr->count == 0) \
|
||
debug->ptr = NULL; \
|
||
else \
|
||
{ \
|
||
debug->ptr = (type) malloc (size * symhdr->count); \
|
||
if (debug->ptr == NULL) \
|
||
{ \
|
||
bfd_set_error (bfd_error_no_memory); \
|
||
goto error_return; \
|
||
} \
|
||
if (bfd_seek (abfd, (file_ptr) symhdr->offset, SEEK_SET) != 0 \
|
||
|| (bfd_read (debug->ptr, size, symhdr->count, \
|
||
abfd) != size * symhdr->count)) \
|
||
goto error_return; \
|
||
}
|
||
|
||
READ (external_ext, cbExtOffset, iextMax, swap->external_ext_size, PTR);
|
||
READ (line, cbLineOffset, cbLine, sizeof (unsigned char), unsigned char *);
|
||
READ (external_dnr, cbDnOffset, idnMax, swap->external_dnr_size, PTR);
|
||
READ (external_pdr, cbPdOffset, ipdMax, swap->external_pdr_size, PTR);
|
||
READ (external_sym, cbSymOffset, isymMax, swap->external_sym_size, PTR);
|
||
READ (external_opt, cbOptOffset, ioptMax, swap->external_opt_size, PTR);
|
||
READ (external_aux, cbAuxOffset, iauxMax, sizeof (union aux_ext),
|
||
union aux_ext *);
|
||
READ (ss, cbSsOffset, issMax, sizeof (char), char *);
|
||
READ (ssext, cbSsExtOffset, issExtMax, sizeof (char), char *);
|
||
READ (external_fdr, cbFdOffset, ifdMax, swap->external_fdr_size, PTR);
|
||
READ (external_rfd, cbRfdOffset, crfd, swap->external_rfd_size, PTR);
|
||
|
||
debug->fdr = NULL;
|
||
debug->adjust = NULL;
|
||
|
||
return true;
|
||
|
||
error_return:
|
||
if (ext_hdr != NULL)
|
||
free (ext_hdr);
|
||
if (debug->external_ext != NULL)
|
||
free (debug->external_ext);
|
||
if (debug->line != NULL)
|
||
free (debug->line);
|
||
if (debug->external_dnr != NULL)
|
||
free (debug->external_dnr);
|
||
if (debug->external_pdr != NULL)
|
||
free (debug->external_pdr);
|
||
if (debug->external_sym != NULL)
|
||
free (debug->external_sym);
|
||
if (debug->external_opt != NULL)
|
||
free (debug->external_opt);
|
||
if (debug->external_aux != NULL)
|
||
free (debug->external_aux);
|
||
if (debug->ss != NULL)
|
||
free (debug->ss);
|
||
if (debug->ssext != NULL)
|
||
free (debug->ssext);
|
||
if (debug->external_fdr != NULL)
|
||
free (debug->external_fdr);
|
||
if (debug->external_rfd != NULL)
|
||
free (debug->external_rfd);
|
||
return false;
|
||
}
|
||
|
||
/* Get EXTR information for a symbol. */
|
||
|
||
static boolean
|
||
mips_elf_get_extr (sym, esym)
|
||
asymbol *sym;
|
||
EXTR *esym;
|
||
{
|
||
const struct ecoff_debug_swap *swap;
|
||
|
||
if (sym->flags & BSF_SECTION_SYM)
|
||
return false;
|
||
|
||
if (bfd_asymbol_flavour (sym) != bfd_target_elf_flavour
|
||
|| ((elf_symbol_type *) sym)->tc_data.mips_extr == NULL)
|
||
{
|
||
esym->jmptbl = 0;
|
||
esym->cobol_main = 0;
|
||
esym->weakext = 0;
|
||
esym->reserved = 0;
|
||
esym->ifd = ifdNil;
|
||
/* FIXME: we can do better than this for st and sc. */
|
||
esym->asym.st = stGlobal;
|
||
esym->asym.sc = scAbs;
|
||
esym->asym.reserved = 0;
|
||
esym->asym.index = indexNil;
|
||
return true;
|
||
}
|
||
|
||
swap = (get_elf_backend_data (bfd_asymbol_bfd (sym))
|
||
->elf_backend_ecoff_debug_swap);
|
||
(*swap->swap_ext_in) (bfd_asymbol_bfd (sym),
|
||
((elf_symbol_type *) sym)->tc_data.mips_extr,
|
||
esym);
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Set the symbol index for an external symbol. This is actually not
|
||
needed for ELF. */
|
||
|
||
/*ARGSUSED*/
|
||
static void
|
||
mips_elf_set_index (sym, indx)
|
||
asymbol *sym;
|
||
bfd_size_type indx;
|
||
{
|
||
}
|
||
|
||
/* We need to use a special link routine to handle the .reginfo and
|
||
the .mdebug sections. We need to merge all instances of these
|
||
sections together, not write them all out sequentially. */
|
||
|
||
static boolean
|
||
mips_elf_final_link (abfd, info)
|
||
bfd *abfd;
|
||
struct bfd_link_info *info;
|
||
{
|
||
bfd *sub;
|
||
size_t outsymalloc;
|
||
struct generic_write_global_symbol_info wginfo;
|
||
asection **secpp;
|
||
asection *o;
|
||
struct bfd_link_order *p;
|
||
asection *reginfo_sec, *mdebug_sec;
|
||
Elf32_RegInfo reginfo;
|
||
struct ecoff_debug_info debug;
|
||
const struct ecoff_debug_swap *swap
|
||
= get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap;
|
||
HDRR *symhdr = &debug.symbolic_header;
|
||
PTR mdebug_handle = NULL;
|
||
|
||
abfd->outsymbols = (asymbol **) NULL;
|
||
abfd->symcount = 0;
|
||
outsymalloc = 0;
|
||
|
||
/* Build the output symbol table. This also reads in the symbols
|
||
for all the input BFDs, keeping them in the outsymbols field. */
|
||
for (sub = info->input_bfds; sub != (bfd *) NULL; sub = sub->link_next)
|
||
if (! _bfd_generic_link_output_symbols (abfd, sub, info, &outsymalloc))
|
||
return false;
|
||
|
||
/* Accumulate the global symbols. */
|
||
wginfo.info = info;
|
||
wginfo.output_bfd = abfd;
|
||
wginfo.psymalloc = &outsymalloc;
|
||
_bfd_generic_link_hash_traverse (_bfd_generic_hash_table (info),
|
||
_bfd_generic_link_write_global_symbol,
|
||
(PTR) &wginfo);
|
||
|
||
/* Remove empty sections. Also drop the .options section, since it
|
||
has special semantics which I haven't bothered to figure out.
|
||
Also drop the .gptab sections, which also require special
|
||
handling which is not currently done. Removing the .gptab
|
||
sections is required for Irix 5 compatibility; I don't know about
|
||
the other sections. */
|
||
secpp = &abfd->sections;
|
||
while (*secpp != NULL)
|
||
{
|
||
if (((*secpp)->_raw_size == 0
|
||
&& strcmp ((*secpp)->name, ".data") != 0
|
||
&& strcmp ((*secpp)->name, ".text") != 0
|
||
&& strcmp ((*secpp)->name, ".bss") != 0)
|
||
|| strcmp ((*secpp)->name, ".options") == 0
|
||
|| strncmp ((*secpp)->name, ".gptab", 6) == 0)
|
||
{
|
||
*secpp = (*secpp)->next;
|
||
--abfd->section_count;
|
||
}
|
||
else
|
||
secpp = &(*secpp)->next;
|
||
}
|
||
|
||
/* Go through the sections and collect the .reginfo and .mdebug
|
||
information. We don't write out the information until we have
|
||
set the section sizes, because the ELF backend only assigns space
|
||
in the file once. */
|
||
reginfo_sec = NULL;
|
||
mdebug_sec = NULL;
|
||
for (o = abfd->sections; o != (asection *) NULL; o = o->next)
|
||
{
|
||
if (strcmp (o->name, ".reginfo") == 0)
|
||
{
|
||
memset (®info, 0, sizeof reginfo);
|
||
|
||
/* We have found the .reginfo section in the output file.
|
||
Look through all the link_orders comprising it and merge
|
||
the information together. */
|
||
for (p = o->link_order_head;
|
||
p != (struct bfd_link_order *) NULL;
|
||
p = p->next)
|
||
{
|
||
asection *input_section;
|
||
bfd *input_bfd;
|
||
Elf32_External_RegInfo ext;
|
||
Elf32_RegInfo sub;
|
||
|
||
if (p->type != bfd_indirect_link_order)
|
||
continue;
|
||
|
||
input_section = p->u.indirect.section;
|
||
input_bfd = input_section->owner;
|
||
BFD_ASSERT (input_section->_raw_size
|
||
== sizeof (Elf32_External_RegInfo));
|
||
if (! bfd_get_section_contents (input_bfd, input_section,
|
||
(PTR) &ext,
|
||
(file_ptr) 0,
|
||
sizeof ext))
|
||
return false;
|
||
|
||
bfd_mips_elf32_swap_reginfo_in (input_bfd, &ext, &sub);
|
||
|
||
reginfo.ri_gprmask |= sub.ri_gprmask;
|
||
reginfo.ri_cprmask[0] |= sub.ri_cprmask[0];
|
||
reginfo.ri_cprmask[1] |= sub.ri_cprmask[1];
|
||
reginfo.ri_cprmask[2] |= sub.ri_cprmask[2];
|
||
reginfo.ri_cprmask[3] |= sub.ri_cprmask[3];
|
||
|
||
/* ri_gp_value is set by the function
|
||
mips_elf_section_processing when the section is
|
||
finally written out. */
|
||
}
|
||
|
||
/* Force the section size to the value we want. */
|
||
o->_raw_size = sizeof (Elf32_External_RegInfo);
|
||
|
||
/* Skip this section later on. */
|
||
o->link_order_head = (struct bfd_link_order *) NULL;
|
||
|
||
reginfo_sec = o;
|
||
}
|
||
|
||
if (strcmp (o->name, ".mdebug") == 0)
|
||
{
|
||
/* We have found the .mdebug section in the output file.
|
||
Look through all the link_orders comprising it and merge
|
||
the information together. */
|
||
symhdr->magic = swap->sym_magic;
|
||
/* FIXME: What should the version stamp be? */
|
||
symhdr->vstamp = 0;
|
||
symhdr->ilineMax = 0;
|
||
symhdr->cbLine = 0;
|
||
symhdr->idnMax = 0;
|
||
symhdr->ipdMax = 0;
|
||
symhdr->isymMax = 0;
|
||
symhdr->ioptMax = 0;
|
||
symhdr->iauxMax = 0;
|
||
symhdr->issMax = 0;
|
||
symhdr->issExtMax = 0;
|
||
symhdr->ifdMax = 0;
|
||
symhdr->crfd = 0;
|
||
symhdr->iextMax = 0;
|
||
|
||
/* We accumulate the debugging information itself in the
|
||
debug_info structure. */
|
||
debug.line = NULL;
|
||
debug.external_dnr = NULL;
|
||
debug.external_pdr = NULL;
|
||
debug.external_sym = NULL;
|
||
debug.external_opt = NULL;
|
||
debug.external_aux = NULL;
|
||
debug.ss = NULL;
|
||
debug.ssext = debug.ssext_end = NULL;
|
||
debug.external_fdr = NULL;
|
||
debug.external_rfd = NULL;
|
||
debug.external_ext = debug.external_ext_end = NULL;
|
||
|
||
mdebug_handle = bfd_ecoff_debug_init (abfd, &debug, swap, info);
|
||
if (mdebug_handle == (PTR) NULL)
|
||
return false;
|
||
|
||
for (p = o->link_order_head;
|
||
p != (struct bfd_link_order *) NULL;
|
||
p = p->next)
|
||
{
|
||
asection *input_section;
|
||
bfd *input_bfd;
|
||
const struct ecoff_debug_swap *input_swap;
|
||
struct ecoff_debug_info input_debug;
|
||
|
||
if (p->type != bfd_indirect_link_order)
|
||
continue;
|
||
|
||
input_section = p->u.indirect.section;
|
||
input_bfd = input_section->owner;
|
||
|
||
if (bfd_get_flavour (input_bfd) != bfd_target_elf_flavour
|
||
|| (get_elf_backend_data (input_bfd)
|
||
->elf_backend_ecoff_debug_swap) == NULL)
|
||
{
|
||
/* I don't know what a non MIPS ELF bfd would be
|
||
doing with a .mdebug section, but I don't really
|
||
want to deal with it. */
|
||
continue;
|
||
}
|
||
|
||
input_swap = (get_elf_backend_data (input_bfd)
|
||
->elf_backend_ecoff_debug_swap);
|
||
|
||
BFD_ASSERT (p->size == input_section->_raw_size);
|
||
|
||
/* The ECOFF linking code expects that we have already
|
||
read in the debugging information and set up an
|
||
ecoff_debug_info structure, so we do that now. */
|
||
if (! mips_elf_read_ecoff_info (input_bfd, input_section,
|
||
&input_debug))
|
||
return false;
|
||
|
||
if (! (bfd_ecoff_debug_accumulate
|
||
(mdebug_handle, abfd, &debug, swap, input_bfd,
|
||
&input_debug, input_swap, info)))
|
||
return false;
|
||
|
||
/* Loop through the external symbols. For each one with
|
||
interesting information, try to find the symbol on
|
||
the symbol table of abfd and save the information in
|
||
order to put it into the final external symbols. */
|
||
if (info->hash->creator == input_bfd->xvec)
|
||
{
|
||
char *eraw_src;
|
||
char *eraw_end;
|
||
|
||
eraw_src = input_debug.external_ext;
|
||
eraw_end = (eraw_src
|
||
+ (input_debug.symbolic_header.iextMax
|
||
* input_swap->external_ext_size));
|
||
for (;
|
||
eraw_src < eraw_end;
|
||
eraw_src += input_swap->external_ext_size)
|
||
{
|
||
EXTR ext;
|
||
const char *name;
|
||
struct generic_link_hash_entry *h;
|
||
elf_symbol_type *elf_sym;
|
||
|
||
(*input_swap->swap_ext_in) (input_bfd, (PTR) eraw_src,
|
||
&ext);
|
||
if (ext.asym.sc == scNil
|
||
|| ext.asym.sc == scUndefined
|
||
|| ext.asym.sc == scSUndefined)
|
||
continue;
|
||
|
||
name = input_debug.ssext + ext.asym.iss;
|
||
h = ((struct generic_link_hash_entry *)
|
||
bfd_link_hash_lookup (info->hash, name, false,
|
||
false, true));
|
||
if (h == (struct generic_link_hash_entry *) NULL
|
||
|| h->sym == (asymbol *) NULL)
|
||
continue;
|
||
|
||
elf_sym = (elf_symbol_type *) (h->sym);
|
||
|
||
if (elf_sym->tc_data.mips_extr != NULL)
|
||
continue;
|
||
|
||
if (ext.ifd != -1)
|
||
{
|
||
BFD_ASSERT (ext.ifd
|
||
< input_debug.symbolic_header.ifdMax);
|
||
ext.ifd = input_debug.ifdmap[ext.ifd];
|
||
}
|
||
|
||
(*input_swap->swap_ext_out) (input_bfd, &ext,
|
||
(PTR) eraw_src);
|
||
elf_sym->tc_data.mips_extr = (PTR) eraw_src;
|
||
}
|
||
}
|
||
|
||
/* Free up the information we just read, except for the
|
||
external symbols which we may have pointers to. */
|
||
free (input_debug.line);
|
||
free (input_debug.external_dnr);
|
||
free (input_debug.external_pdr);
|
||
free (input_debug.external_sym);
|
||
free (input_debug.external_opt);
|
||
free (input_debug.external_aux);
|
||
free (input_debug.ss);
|
||
free (input_debug.ssext);
|
||
free (input_debug.external_fdr);
|
||
free (input_debug.external_rfd);
|
||
}
|
||
|
||
/* Build the external symbol information. */
|
||
if (! bfd_ecoff_debug_externals (abfd, &debug, swap,
|
||
info->relocateable,
|
||
mips_elf_get_extr,
|
||
mips_elf_set_index))
|
||
return false;
|
||
|
||
/* Set the size of the section. */
|
||
o->_raw_size = bfd_ecoff_debug_size (abfd, &debug, swap);
|
||
|
||
/* Skip this section later on. */
|
||
o->link_order_head = (struct bfd_link_order *) NULL;
|
||
|
||
mdebug_sec = o;
|
||
}
|
||
}
|
||
|
||
if (info->relocateable)
|
||
{
|
||
/* Allocate space for the output relocs for each section. */
|
||
for (o = abfd->sections;
|
||
o != (asection *) NULL;
|
||
o = o->next)
|
||
{
|
||
o->reloc_count = 0;
|
||
for (p = o->link_order_head;
|
||
p != (struct bfd_link_order *) NULL;
|
||
p = p->next)
|
||
{
|
||
if (p->type == bfd_section_reloc_link_order
|
||
|| p->type == bfd_symbol_reloc_link_order)
|
||
++o->reloc_count;
|
||
else if (p->type == bfd_indirect_link_order)
|
||
{
|
||
asection *input_section;
|
||
bfd *input_bfd;
|
||
bfd_size_type relsize;
|
||
arelent **relocs;
|
||
bfd_size_type reloc_count;
|
||
|
||
input_section = p->u.indirect.section;
|
||
input_bfd = input_section->owner;
|
||
relsize = bfd_get_reloc_upper_bound (input_bfd,
|
||
input_section);
|
||
relocs = (arelent **) malloc (relsize);
|
||
if (!relocs && relsize != 0)
|
||
{
|
||
bfd_set_error (bfd_error_no_memory);
|
||
return false;
|
||
}
|
||
reloc_count =
|
||
bfd_canonicalize_reloc (input_bfd, input_section,
|
||
relocs,
|
||
bfd_get_outsymbols (input_bfd));
|
||
BFD_ASSERT (reloc_count == input_section->reloc_count);
|
||
o->reloc_count += reloc_count;
|
||
free (relocs);
|
||
}
|
||
}
|
||
if (o->reloc_count > 0)
|
||
{
|
||
o->orelocation = ((arelent **)
|
||
bfd_alloc (abfd,
|
||
(o->reloc_count
|
||
* sizeof (arelent *))));
|
||
if (!o->orelocation)
|
||
{
|
||
bfd_set_error (bfd_error_no_memory);
|
||
return false;
|
||
}
|
||
o->flags |= SEC_RELOC;
|
||
/* Reset the count so that it can be used as an index
|
||
when putting in the output relocs. */
|
||
o->reloc_count = 0;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Write out the information we have accumulated. */
|
||
if (reginfo_sec != (asection *) NULL)
|
||
{
|
||
Elf32_External_RegInfo ext;
|
||
|
||
bfd_mips_elf32_swap_reginfo_out (abfd, ®info, &ext);
|
||
if (! bfd_set_section_contents (abfd, reginfo_sec, (PTR) &ext,
|
||
(file_ptr) 0, sizeof ext))
|
||
return false;
|
||
}
|
||
|
||
if (mdebug_sec != (asection *) NULL)
|
||
{
|
||
if (! abfd->output_has_begun)
|
||
{
|
||
/* Force the section to be given a file position. */
|
||
bfd_set_section_contents (abfd, mdebug_sec, (PTR) NULL,
|
||
(file_ptr) 0, (bfd_size_type) 0);
|
||
BFD_ASSERT (abfd->output_has_begun);
|
||
}
|
||
if (! bfd_ecoff_write_accumulated_debug (mdebug_handle, abfd, &debug,
|
||
swap, info,
|
||
mdebug_sec->filepos))
|
||
return false;
|
||
|
||
bfd_ecoff_debug_free (mdebug_handle, abfd, &debug, swap, info);
|
||
}
|
||
|
||
/* Handle all the link order information for the sections. */
|
||
for (o = abfd->sections;
|
||
o != (asection *) NULL;
|
||
o = o->next)
|
||
{
|
||
for (p = o->link_order_head;
|
||
p != (struct bfd_link_order *) NULL;
|
||
p = p->next)
|
||
{
|
||
switch (p->type)
|
||
{
|
||
case bfd_section_reloc_link_order:
|
||
case bfd_symbol_reloc_link_order:
|
||
if (! _bfd_generic_reloc_link_order (abfd, info, o, p))
|
||
return false;
|
||
break;
|
||
default:
|
||
if (! _bfd_default_link_order (abfd, info, o, p))
|
||
return false;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* MIPS ELF uses two common sections. One is the usual one, and the
|
||
other is for small objects. All the small objects are kept
|
||
together, and then referenced via the gp pointer, which yields
|
||
faster assembler code. This is what we use for the small common
|
||
section. This approach is copied from ecoff.c. */
|
||
static asection mips_elf_scom_section;
|
||
static asymbol mips_elf_scom_symbol;
|
||
static asymbol *mips_elf_scom_symbol_ptr;
|
||
|
||
/* MIPS ELF also uses an acommon section, which represents an
|
||
allocated common symbol which may be overridden by a
|
||
definition in a shared library. */
|
||
static asection mips_elf_acom_section;
|
||
static asymbol mips_elf_acom_symbol;
|
||
static asymbol *mips_elf_acom_symbol_ptr;
|
||
|
||
/* Handle the special MIPS section numbers that a symbol may use. */
|
||
|
||
static void
|
||
mips_elf_symbol_processing (abfd, asym)
|
||
bfd *abfd;
|
||
asymbol *asym;
|
||
{
|
||
elf_symbol_type *elfsym;
|
||
|
||
elfsym = (elf_symbol_type *) asym;
|
||
switch (elfsym->internal_elf_sym.st_shndx)
|
||
{
|
||
case SHN_MIPS_ACOMMON:
|
||
/* This section is used in a dynamically linked executable file.
|
||
It is an allocated common section. The dynamic linker can
|
||
either resolve these symbols to something in a shared
|
||
library, or it can just leave them here. For our purposes,
|
||
we can consider these symbols to be in a new section. */
|
||
if (mips_elf_acom_section.name == NULL)
|
||
{
|
||
/* Initialize the acommon section. */
|
||
mips_elf_acom_section.name = ".acommon";
|
||
mips_elf_acom_section.flags = SEC_NO_FLAGS;
|
||
mips_elf_acom_section.output_section = &mips_elf_acom_section;
|
||
mips_elf_acom_section.symbol = &mips_elf_acom_symbol;
|
||
mips_elf_acom_section.symbol_ptr_ptr = &mips_elf_acom_symbol_ptr;
|
||
mips_elf_acom_symbol.name = ".acommon";
|
||
mips_elf_acom_symbol.flags = BSF_SECTION_SYM;
|
||
mips_elf_acom_symbol.section = &mips_elf_acom_section;
|
||
mips_elf_acom_symbol_ptr = &mips_elf_acom_symbol;
|
||
}
|
||
asym->section = &mips_elf_acom_section;
|
||
break;
|
||
|
||
case SHN_COMMON:
|
||
/* Common symbols less than the GP size are automatically
|
||
treated as SHN_MIPS_SCOMMON symbols. */
|
||
if (asym->value > elf_gp_size (abfd))
|
||
break;
|
||
/* Fall through. */
|
||
case SHN_MIPS_SCOMMON:
|
||
if (mips_elf_scom_section.name == NULL)
|
||
{
|
||
/* Initialize the small common section. */
|
||
mips_elf_scom_section.name = ".scommon";
|
||
mips_elf_scom_section.flags = SEC_IS_COMMON;
|
||
mips_elf_scom_section.output_section = &mips_elf_scom_section;
|
||
mips_elf_scom_section.symbol = &mips_elf_scom_symbol;
|
||
mips_elf_scom_section.symbol_ptr_ptr = &mips_elf_scom_symbol_ptr;
|
||
mips_elf_scom_symbol.name = ".scommon";
|
||
mips_elf_scom_symbol.flags = BSF_SECTION_SYM;
|
||
mips_elf_scom_symbol.section = &mips_elf_scom_section;
|
||
mips_elf_scom_symbol_ptr = &mips_elf_scom_symbol;
|
||
}
|
||
asym->section = &mips_elf_scom_section;
|
||
asym->value = elfsym->internal_elf_sym.st_size;
|
||
break;
|
||
|
||
case SHN_MIPS_SUNDEFINED:
|
||
asym->section = &bfd_und_section;
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* ECOFF swapping routines. These are used when dealing with the
|
||
.mdebug section, which is in the ECOFF debugging format. */
|
||
static const struct ecoff_debug_swap mips_elf_ecoff_debug_swap =
|
||
{
|
||
/* Symbol table magic number. */
|
||
magicSym,
|
||
/* Alignment of debugging information. E.g., 4. */
|
||
4,
|
||
/* Sizes of external symbolic information. */
|
||
sizeof (struct hdr_ext),
|
||
sizeof (struct dnr_ext),
|
||
sizeof (struct pdr_ext),
|
||
sizeof (struct sym_ext),
|
||
sizeof (struct opt_ext),
|
||
sizeof (struct fdr_ext),
|
||
sizeof (struct rfd_ext),
|
||
sizeof (struct ext_ext),
|
||
/* Functions to swap in external symbolic data. */
|
||
ecoff_swap_hdr_in,
|
||
ecoff_swap_dnr_in,
|
||
ecoff_swap_pdr_in,
|
||
ecoff_swap_sym_in,
|
||
ecoff_swap_opt_in,
|
||
ecoff_swap_fdr_in,
|
||
ecoff_swap_rfd_in,
|
||
ecoff_swap_ext_in,
|
||
/* Functions to swap out external symbolic data. */
|
||
ecoff_swap_hdr_out,
|
||
ecoff_swap_dnr_out,
|
||
ecoff_swap_pdr_out,
|
||
ecoff_swap_sym_out,
|
||
ecoff_swap_opt_out,
|
||
ecoff_swap_fdr_out,
|
||
ecoff_swap_rfd_out,
|
||
ecoff_swap_ext_out
|
||
};
|
||
|
||
#define TARGET_LITTLE_SYM bfd_elf32_littlemips_vec
|
||
#define TARGET_LITTLE_NAME "elf32-littlemips"
|
||
#define TARGET_BIG_SYM bfd_elf32_bigmips_vec
|
||
#define TARGET_BIG_NAME "elf32-bigmips"
|
||
#define ELF_ARCH bfd_arch_mips
|
||
#define ELF_MACHINE_CODE EM_MIPS
|
||
#define ELF_MAXPAGESIZE 0x10000
|
||
#define elf_info_to_howto 0
|
||
#define elf_info_to_howto_rel mips_info_to_howto_rel
|
||
#define elf_backend_sym_is_global mips_elf_sym_is_global
|
||
#define elf_backend_object_p mips_elf_object_p
|
||
#define elf_backend_section_from_shdr mips_elf_section_from_shdr
|
||
#define elf_backend_fake_sections mips_elf_fake_sections
|
||
#define elf_backend_section_from_bfd_section \
|
||
mips_elf_section_from_bfd_section
|
||
#define elf_backend_section_processing mips_elf_section_processing
|
||
#define elf_backend_symbol_processing mips_elf_symbol_processing
|
||
#define elf_backend_final_write_processing \
|
||
mips_elf_final_write_processing
|
||
#define elf_backend_ecoff_debug_swap &mips_elf_ecoff_debug_swap
|
||
|
||
#define bfd_elf32_bfd_link_add_symbols _bfd_generic_link_add_symbols_collect
|
||
#define bfd_elf32_bfd_final_link mips_elf_final_link
|
||
|
||
#include "elf32-target.h"
|