OpenE2K/binutils-gdb
12
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
d3507982fb
binutils-gdb/bfd/elf32-mips.c
Ian Lance Taylor 497c543457 * elf.c (_bfd_elf_make_section_from_shdr): New function, based on 
code repeated three times in bfd_section_from_shdr in elfcode.h.
	* libelf.h (_bfd_elf_make_section_from_shdr): Declare.
	* elfcode.h (bfd_section_from_shdr): Use new function
	_bfd_elf_make_section_from_shdr to create BFD sections.  If a
	reloc section does not use the main symbol table, or it is part of
	the process image, treat it as a normal section, not relocs.
	* elf32-mips.c (mips_elf_section_from_shdr): Use new function
	_bfd_elf_make_section_from_shdr.
1994-05-20 16:04:59 +00:00

1686 lines
49 KiB
C
Raw Blame History

This file contains invisible Unicode characters

This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

/* 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;
{
asection *newsect;
/* 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 (! _bfd_elf_make_section_from_shdr (abfd, hdr, name))
return false;
newsect = (asection *) hdr->rawdata;
if (hdr->sh_type == SHT_MIPS_DEBUG)
{
if (! bfd_set_section_flags (abfd, newsect,
(bfd_get_section_flags (abfd, newsect)
| SEC_DEBUGGING)))
return false;
}
/* FIXME: We should record sh_info 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))
return false;
bfd_mips_elf32_swap_reginfo_in (abfd, &ext, &s);
elf_gp (abfd) = s.ri_gp_value;
}
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);
/* 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 .options. */
secpp = &abfd->sections;
while (*secpp != NULL)
{
if (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 (&reginfo, 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;
long relsize;
arelent **relocs;
long reloc_count;
input_section = p->u.indirect.section;
input_bfd = input_section->owner;
relsize = bfd_get_reloc_upper_bound (input_bfd,
input_section);
if (relsize < 0)
return false;
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));
if (reloc_count < 0)
return false;
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, &reginfo, &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_backend_collect true
#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"
Reference in New Issue View Git Blame Copy Permalink