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old-cross-binutils/bfd/elf32-arm.c
Catherine Moore efaa65c99c * Makefile.am: Add support for elf32-arm.lo. 
* Makefile.in: Rebuild.
        * config.bfd (arm-*-elf):  Define targ_defvec and targ_selvecs.
        (thumb-*-elf): Define targ_defvec and targ_selvecs.
        * configure.in:  Handle bfd_elf32_littlearm_vec and bfd_elf32_bigarm_vec.
        * configure: Regenerate.
        * elf.c: (prep_headers):  Support arch_type of EM_ARM.
        * targets.c:  Support new targets bfd_elf32_bigarm_vec and
        bfd_target bfd_elf32_littlearm_vec.
        * elf32-arm.c:  New file.
1998-07-31 21:26:28 +00:00

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/* start-sanitize-armelf */
/* 32-bit ELF support for ARM
Copyright 1993, 1995, 1998 Free Software Foundation, Inc.
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/arm.h"
static reloc_howto_type *elf32_arm_reloc_type_lookup
PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
static void elf32_arm_info_to_howto
PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
#define USE_RELA
#define TARGET_UNDERSCORE '_'
static reloc_howto_type elf32_arm_howto_table[] =
{
/* No relocation */
HOWTO (R_ARM_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_ARM_NONE", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_ARM_PC24, /* type */
2, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
24, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_ARM_PC24", /* name */
false, /* partial_inplace */
0x00ffffff, /* src_mask */
0x00ffffff, /* dst_mask */
true), /* pcrel_offset */
/* 32 bit absolute */
HOWTO (R_ARM_ABS32, /* 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_ARM_ABS32", /* name */
false, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* standard 32bit pc-relative reloc */
HOWTO (R_ARM_REL32, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_ARM_REL32", /* name */
false, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
true), /* pcrel_offset */
/* 8 bit absolute */
HOWTO (R_ARM_ABS8, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_ARM_ABS8", /* name */
false, /* partial_inplace */
0x000000ff, /* src_mask */
0x000000ff, /* dst_mask */
false), /* pcrel_offset */
/* 16 bit absolute */
HOWTO (R_ARM_ABS16, /* 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_ARM_ABS16", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
/* 12 bit absolute */
HOWTO (R_ARM_ABS12, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
12, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_ARM_ABS12", /* name */
false, /* partial_inplace */
0x000008ff, /* src_mask */
0x000008ff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_ARM_THM_ABS5, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
5, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_ARM_THM_ABS5", /* name */
false, /* partial_inplace */
0x000007e0, /* src_mask */
0x000007e0, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_ARM_THM_PC22, /* type */
1, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
22, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_ARM_THM_PC22", /* name */
false, /* partial_inplace */
0x07ff07ff, /* src_mask */
0x07ff07ff, /* dst_mask */
true), /* pcrel_offset */
HOWTO (R_ARM_SBREL32, /* 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_ARM_SBREL32", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_ARM_AMP_VCALL9, /* type */
1, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_ARM_AMP_VCALL9", /* name */
false, /* partial_inplace */
0x000000ff, /* src_mask */
0x000000ff, /* dst_mask */
true), /* pcrel_offset */
/* 12 bit pc relative */
HOWTO (R_ARM_THM_PC11, /* type */
1, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
11, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_ARM_THM_PC11", /* name */
false, /* partial_inplace */
0x000007ff, /* src_mask */
0x000007ff, /* dst_mask */
true), /* pcrel_offset */
/* 12 bit pc relative */
HOWTO (R_ARM_THM_PC9, /* type */
1, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_ARM_THM_PC9", /* name */
false, /* partial_inplace */
0x000000ff, /* src_mask */
0x000000ff, /* dst_mask */
true), /* pcrel_offset */
/* FILL ME IN (#13-249) */
HOWTO (R_ARM_RREL32, /* 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_ARM_RREL32", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_ARM_RABS32, /* 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_ARM_RABS32", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_ARM_RPC24, /* 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_ARM_RPC24", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_ARM_RBASE, /* 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_ARM_RBASE", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
};
struct elf32_arm_reloc_map
{
unsigned char bfd_reloc_val;
unsigned char elf_reloc_val;
};
static const struct elf32_arm_reloc_map elf32_arm_reloc_map[] =
{
{ BFD_RELOC_NONE, R_ARM_NONE, },
{ BFD_RELOC_ARM_PCREL_BRANCH, R_ARM_PC24, },
{ BFD_RELOC_32, R_ARM_ABS32, },
{ BFD_RELOC_32_PCREL, R_ARM_REL32, },
{ BFD_RELOC_8, R_ARM_ABS8, },
{ BFD_RELOC_16, R_ARM_ABS16, },
{ BFD_RELOC_ARM_OFFSET_IMM, R_ARM_ABS12, },
{ BFD_RELOC_ARM_THUMB_OFFSET, R_ARM_THM_ABS5, },
{ BFD_RELOC_THUMB_PCREL_BRANCH23, R_ARM_THM_PC22, },
{ BFD_RELOC_NONE, R_ARM_SBREL32 , },
{ BFD_RELOC_NONE, R_ARM_AMP_VCALL9, },
{ BFD_RELOC_THUMB_PCREL_BRANCH12, R_ARM_THM_PC11, },
{ BFD_RELOC_THUMB_PCREL_BRANCH9, R_ARM_THM_PC9, }
};
static reloc_howto_type *
elf32_arm_reloc_type_lookup (abfd, code)
bfd *abfd;
bfd_reloc_code_real_type code;
{
unsigned int i;
for (i = 0;
i < sizeof (elf32_arm_reloc_map) / sizeof (struct elf32_arm_reloc_map);
i++)
{
if (elf32_arm_reloc_map[i].bfd_reloc_val == code)
return &elf32_arm_howto_table[elf32_arm_reloc_map[i].elf_reloc_val];
}
return NULL;
}
static void
elf32_arm_info_to_howto (abfd, bfd_reloc, elf_reloc)
bfd *abfd;
arelent *bfd_reloc;
Elf32_Internal_Rela *elf_reloc;
{
unsigned int r_type;
r_type = ELF32_R_TYPE (elf_reloc->r_info);
/* fixme: need range test */
/* BFD_ASSERT (r_type < (unsigned int) R_ELF32_ARM_MAX); */
bfd_reloc->howto = &elf32_arm_howto_table[r_type];
}
/* Perform a relocation as part of a final link. */
static bfd_reloc_status_type
elf32_arm_final_link_relocate (howto, input_bfd, output_bfd,
input_section, contents, offset, value,
addend, info, sym_sec, is_local)
reloc_howto_type *howto;
bfd *input_bfd;
bfd *output_bfd;
asection *input_section;
bfd_byte *contents;
bfd_vma offset;
bfd_vma value;
bfd_vma addend;
struct bfd_link_info *info;
asection *sym_sec;
int is_local;
{
unsigned long r_type = howto->type;
bfd_byte *hit_data = contents + offset;
switch (r_type)
{
case R_ARM_NONE:
return bfd_reloc_ok;
case R_ARM_PC24:
value -= (input_section->output_offset + offset + 8);
value += addend;
value = value >> 2;
/* if ((long) value > 0xffffff || (long) value < -0x1000000)
return bfd_reloc_overflow; */
value &= 0xffffff;
value |= (bfd_get_32 (input_bfd, hit_data) & 0xff000000);
bfd_put_32 (input_bfd, value, hit_data);
return bfd_reloc_ok;
case R_ARM_ABS32:
value += addend;
bfd_put_32 (input_bfd, value, hit_data);
return bfd_reloc_ok;
case R_ARM_REL32:
value -= (input_section->output_section->vma
+ input_section->output_offset);
value += addend;
bfd_put_32 (input_bfd, value, hit_data);
return bfd_reloc_ok;
case R_ARM_ABS8:
value += addend;
if ((long) value > 0x7f || (long) value < -0x80)
return bfd_reloc_overflow;
bfd_put_8 (input_bfd, value, hit_data);
return bfd_reloc_ok;
case R_ARM_ABS16:
value += addend;
if ((long) value > 0x7fff || (long) value < -0x8000)
return bfd_reloc_overflow;
bfd_put_16 (input_bfd, value, hit_data);
return bfd_reloc_ok;
case R_ARM_ABS12:
/* Support ldr and str instruction for the arm */
/* Also thumb b (unconditional branch) */
value += addend;
if ((long) value > 0x7ff || (long) value < -0x800)
return bfd_reloc_overflow;
value |= (bfd_get_32 (input_bfd, hit_data) & 0xfffff000);
bfd_put_32 (input_bfd, value, hit_data);
return bfd_reloc_ok;
case R_ARM_THM_ABS5:
/* Support ldr and str instructions for the thumb. */
value += addend;
if ((long) value > 0x1f || (long) value < -0x10)
return bfd_reloc_overflow;
value |= bfd_get_16 (input_bfd, hit_data) & 0xf82f;
bfd_put_16 (input_bfd, value, hit_data);
return bfd_reloc_ok;
break;
#define LOW_HI_ORDER 0xF800F000
#define HI_LOW_ORDER 0xF000F800
/* thumb BL (branch long instruction). */
case R_ARM_THM_PC22:
{
unsigned int low_bits;
unsigned int high_bits;
bfd_vma insn;
value -= (input_section->output_offset + offset + 8);
value += addend;
value = value >> 1;
low_bits = value & 0x000007ff;
high_bits = (value >> 11) & 0x000007ff;
insn = bfd_get_32 (input_bfd, hit_data);
if ((insn & LOW_HI_ORDER) == LOW_HI_ORDER)
insn = LOW_HI_ORDER | (low_bits << 16) | high_bits;
else if ((insn & HI_LOW_ORDER) == HI_LOW_ORDER)
insn = HI_LOW_ORDER | (high_bits << 16) | low_bits;
else
abort(); /* error - not a valid branch instruction form */
bfd_put_32 (input_bfd, insn, hit_data);
return bfd_reloc_ok;
}
break;
case R_ARM_SBREL32:
break;
case R_ARM_AMP_VCALL9:
return bfd_reloc_notsupported;
case R_ARM_RSBREL32:
return bfd_reloc_notsupported;
case R_ARM_THM_RPC22:
return bfd_reloc_notsupported;
case R_ARM_RREL32:
return bfd_reloc_notsupported;
case R_ARM_RABS32:
return bfd_reloc_notsupported;
case R_ARM_RPC24:
return bfd_reloc_notsupported;
case R_ARM_RBASE:
return bfd_reloc_notsupported;
default:
return bfd_reloc_notsupported;
}
}
/* Relocate an ARM ELF section. */
static boolean
elf32_arm_relocate_section (output_bfd, info, input_bfd, input_section,
contents, relocs, local_syms, local_sections)
bfd *output_bfd;
struct bfd_link_info *info;
bfd *input_bfd;
asection *input_section;
bfd_byte *contents;
Elf_Internal_Rela *relocs;
Elf_Internal_Sym *local_syms;
asection **local_sections;
{
Elf_Internal_Shdr *symtab_hdr;
struct elf_link_hash_entry **sym_hashes;
Elf_Internal_Rela *rel, *relend;
symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
sym_hashes = elf_sym_hashes (input_bfd);
rel = relocs;
relend = relocs + input_section->reloc_count;
for (; rel < relend; rel++)
{
int r_type;
reloc_howto_type *howto;
unsigned long r_symndx;
Elf_Internal_Sym *sym;
asection *sec;
struct elf_link_hash_entry *h;
bfd_vma relocation;
bfd_reloc_status_type r;
r_symndx = ELF32_R_SYM (rel->r_info);
r_type = ELF32_R_TYPE (rel->r_info);
howto = elf32_arm_howto_table + r_type;
if (info->relocateable)
{
/* This is a relocateable link. We don't have to change
anything, unless the reloc is against a section symbol,
in which case we have to adjust according to where the
section symbol winds up in the output section. */
if (r_symndx < symtab_hdr->sh_info)
{
sym = local_syms + r_symndx;
if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
{
sec = local_sections[r_symndx];
rel->r_addend += sec->output_offset + sym->st_value;
}
}
continue;
}
/* This is a final link. */
h = NULL;
sym = NULL;
sec = NULL;
if (r_symndx < symtab_hdr->sh_info)
{
sym = local_syms + r_symndx;
sec = local_sections[r_symndx];
relocation = (sec->output_section->vma
+ sec->output_offset
+ sym->st_value);
}
else
{
h = sym_hashes[r_symndx - symtab_hdr->sh_info];
while (h->root.type == bfd_link_hash_indirect
|| h->root.type == bfd_link_hash_warning)
h = (struct elf_link_hash_entry *) h->root.u.i.link;
if (h->root.type == bfd_link_hash_defined
|| h->root.type == bfd_link_hash_defweak)
{
sec = h->root.u.def.section;
relocation = (h->root.u.def.value
+ sec->output_section->vma
+ sec->output_offset);
}
else if (h->root.type == bfd_link_hash_undefweak)
relocation = 0;
else
{
if (! ((*info->callbacks->undefined_symbol)
(info, h->root.root.string, input_bfd,
input_section, rel->r_offset)))
return false;
relocation = 0;
}
}
r = elf32_arm_final_link_relocate (howto, input_bfd, output_bfd,
input_section,
contents, rel->r_offset,
relocation, rel->r_addend,
info, sec, h == NULL);
if (r != bfd_reloc_ok)
{
const char *name;
const char *msg = (const char *)0;
if (h != NULL)
name = h->root.root.string;
else
{
name = (bfd_elf_string_from_elf_section
(input_bfd, symtab_hdr->sh_link, sym->st_name));
if (name == NULL || *name == '\0')
name = bfd_section_name (input_bfd, sec);
}
switch (r)
{
case bfd_reloc_overflow:
if (! ((*info->callbacks->reloc_overflow)
(info, name, howto->name, (bfd_vma) 0,
input_bfd, input_section, rel->r_offset)))
return false;
break;
case bfd_reloc_undefined:
if (! ((*info->callbacks->undefined_symbol)
(info, name, input_bfd, input_section,
rel->r_offset)))
return false;
break;
case bfd_reloc_outofrange:
msg = _("internal error: out of range error");
goto common_error;
case bfd_reloc_notsupported:
msg = _("internal error: unsupported relocation error");
goto common_error;
case bfd_reloc_dangerous:
msg = _("internal error: dangerous error");
goto common_error;
default:
msg = _("internal error: unknown error");
/* fall through */
common_error:
if (!((*info->callbacks->warning)
(info, msg, name, input_bfd, input_section,
rel->r_offset)))
return false;
break;
}
}
}
return true;
}
#define TARGET_LITTLE_SYM bfd_elf32_littlearm_vec
#define TARGET_LITTLE_NAME "elf32-littlearm"
#define TARGET_BIG_SYM bfd_elf32_bigarm_vec
#define TARGET_BIG_NAME "elf32-bigarm"
#define ELF_ARCH bfd_arch_arm
#define ELF_MACHINE_CODE EM_ARM
#define bfd_elf32_bfd_reloc_type_lookup elf32_arm_reloc_type_lookup
#define elf_info_to_howto elf32_arm_info_to_howto
#define elf_info_to_howto_rel 0
#define elf_backend_relocate_section elf32_arm_relocate_section
#define elf_symbol_leading_char '_'
#include "elf32-target.h"
/* end-sanitize-armelf */
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