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* elf32-i386.c (elf_howto_table): Comments.

Browse source 
(elf_i386_relocate_section): Handle more relocs for relocatable
	linking and against SEC_MERGE sections.
This commit is contained in:
Alan Modra 2002-05-09 06:34:43 +00:00
parent 9197546776
commit 4a335f3dc2
2 changed files with 123 additions and 25 deletions
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6
bfd/ChangeLog
View file

@ -1,3 +1,9 @@
2002-05-09 Alan Modra <amodra@bigpond.net.au>
* elf32-i386.c (elf_howto_table): Comments.
(elf_i386_relocate_section): Handle more relocs for relocatable
linking and against SEC_MERGE sections.
2002-05-08 Alan Modra <amodra@bigpond.net.au>
* elf32-ppc.c (ppc_elf_create_got): New function.

138
bfd/elf32-i386.c
View file

@ -154,7 +154,7 @@ static reloc_howto_type elf_howto_table[]=
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false),
false), /* pcrel_offset */
/* GNU extension to record C++ vtable member usage. */
HOWTO (R_386_GNU_VTENTRY, /* type */
@ -169,7 +169,7 @@ static reloc_howto_type elf_howto_table[]=
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false)
false) /* pcrel_offset */
#define R_386_vt ((unsigned int) R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
@ -1724,6 +1724,7 @@ elf_i386_relocate_section (output_bfd, info, input_bfd, input_section,
bfd_vma off;
bfd_vma relocation;
boolean unresolved_reloc;
boolean overflow;
bfd_reloc_status_type r;
unsigned int indx;
@ -1745,22 +1746,66 @@ elf_i386_relocate_section (output_bfd, info, input_bfd, input_section,
if (info->relocateable)
{
bfd_vma val;
bfd_vma addend;
bfd_byte *where;
/* This is a relocatable 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)
{
if (r_symndx >= symtab_hdr->sh_info)
continue;
sym = local_syms + r_symndx;
if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
{
bfd_vma val;
if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
continue;
sec = local_sections[r_symndx];
val = bfd_get_32 (input_bfd, contents + rel->r_offset);
val += sec->output_offset + sym->st_value;
bfd_put_32 (input_bfd, val, contents + rel->r_offset);
val = sec->output_offset;
if (val == 0)
continue;
where = contents + rel->r_offset;
switch (howto->size)
{
case 0:
addend = bfd_get_8 (input_bfd, where);
if (howto->pc_relative)
addend = (addend ^ 0x80) - 0x80;
val += addend;
bfd_put_8 (input_bfd, val, where);
if (howto->pc_relative)
val += 0x80;
if (val > 0xff)
{
h = NULL;
r = bfd_reloc_overflow;
goto overflow_error;
}
break;
case 1:
addend = bfd_get_16 (input_bfd, where);
if (howto->pc_relative)
addend = (addend ^ 0x8000) - 0x8000;
val += addend;
bfd_put_16 (input_bfd, val, where);
if (howto->pc_relative)
val += 0x8000;
if (output_bfd->arch_info->mach != bfd_mach_i386_i8086
&& val > 0xffff)
{
h = NULL;
r = bfd_reloc_overflow;
goto overflow_error;
}
break;
case 2:
val += bfd_get_32 (input_bfd, where);
bfd_put_32 (input_bfd, val, where);
break;
default:
abort ();
}
continue;
}
@ -1770,6 +1815,7 @@ elf_i386_relocate_section (output_bfd, info, input_bfd, input_section,
sym = NULL;
sec = NULL;
unresolved_reloc = false;
overflow = false;
if (r_symndx < symtab_hdr->sh_info)
{
sym = local_syms + r_symndx;
@ -1782,24 +1828,68 @@ elf_i386_relocate_section (output_bfd, info, input_bfd, input_section,
{
asection *msec;
bfd_vma addend;
bfd_byte *where = contents + rel->r_offset;
if (howto->src_mask != 0xffffffff)
switch (howto->size)
{
(*_bfd_error_handler)
(_("%s(%s+0x%lx): %s relocation against SEC_MERGE section"),
bfd_archive_filename (input_bfd),
bfd_get_section_name (input_bfd, input_section),
(long) rel->r_offset, howto->name);
return false;
case 0:
addend = bfd_get_8 (input_bfd, where);
if (howto->pc_relative)
{
addend = (addend ^ 0x80) - 0x80;
addend += 1;
}
break;
case 1:
addend = bfd_get_16 (input_bfd, where);
if (howto->pc_relative)
{
addend = (addend ^ 0x8000) - 0x8000;
addend += 2;
}
break;
case 2:
addend = bfd_get_32 (input_bfd, where);
if (howto->pc_relative)
{
addend = (addend ^ 0x80000000) - 0x80000000;
addend += 4;
}
break;
default:
abort ();
}
addend = bfd_get_32 (input_bfd, contents + rel->r_offset);
msec = sec;
addend =
_bfd_elf_rel_local_sym (output_bfd, sym, &msec, addend)
- relocation;
addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, addend);
addend -= relocation;
addend += msec->output_section->vma + msec->output_offset;
bfd_put_32 (input_bfd, addend, contents + rel->r_offset);
switch (howto->size)
{
case 0:
if (howto->pc_relative)
addend -= 1;
bfd_put_8 (input_bfd, addend, where);
if (howto->pc_relative)
addend += 0x80;
overflow = addend > 0xff;
break;
case 1:
if (howto->pc_relative)
addend -= 2;
bfd_put_16 (input_bfd, addend, where);
if (howto->pc_relative)
addend += 0x8000;
if (output_bfd->arch_info->mach != bfd_mach_i386_i8086)
overflow = addend > 0xffff;
break;
case 2:
if (howto->pc_relative)
addend -= 4;
bfd_put_32 (input_bfd, addend, where);
break;
}
}
}
else
@ -2082,7 +2172,10 @@ elf_i386_relocate_section (output_bfd, info, input_bfd, input_section,
r = _bfd_final_link_relocate (howto, input_bfd, input_section,
contents, rel->r_offset,
relocation, (bfd_vma) 0);
if (overflow && r == bfd_reloc_ok)
r = bfd_reloc_overflow;
overflow_error:
if (r != bfd_reloc_ok)
{
const char *name;
@ -2102,7 +2195,6 @@ elf_i386_relocate_section (output_bfd, info, input_bfd, input_section,
if (r == bfd_reloc_overflow)
{
if (! ((*info->callbacks->reloc_overflow)
(info, name, howto->name, (bfd_vma) 0,
input_bfd, input_section, rel->r_offset)))