391 lines
11 KiB
C
391 lines
11 KiB
C
/* moxie-specific support for 32-bit ELF.
|
||
Copyright 2009, 2010, 2012 Free Software Foundation, Inc.
|
||
|
||
Copied from elf32-fr30.c which is..
|
||
Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
|
||
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 3 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., 51 Franklin Street - Fifth Floor, Boston,
|
||
MA 02110-1301, USA. */
|
||
|
||
#include "sysdep.h"
|
||
#include "bfd.h"
|
||
#include "libbfd.h"
|
||
#include "elf-bfd.h"
|
||
#include "elf/moxie.h"
|
||
|
||
/* Forward declarations. */
|
||
|
||
static reloc_howto_type moxie_elf_howto_table [] =
|
||
{
|
||
/* This reloc does nothing. */
|
||
HOWTO (R_MOXIE_NONE, /* 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_MOXIE_NONE", /* name */
|
||
FALSE, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0, /* dst_mask */
|
||
FALSE), /* pcrel_offset */
|
||
|
||
/* A 32 bit absolute relocation. */
|
||
HOWTO (R_MOXIE_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_MOXIE_32", /* name */
|
||
FALSE, /* partial_inplace */
|
||
0x00000000, /* src_mask */
|
||
0xffffffff, /* dst_mask */
|
||
FALSE), /* pcrel_offset */
|
||
|
||
/* A 10 bit PC-relative relocation. */
|
||
HOWTO (R_MOXIE_PCREL10, /* type. */
|
||
1, /* rightshift. */
|
||
1, /* size (0 = byte, 1 = short, 2 = long). */
|
||
10, /* bitsize. */
|
||
TRUE, /* pc_relative. */
|
||
0, /* bitpos. */
|
||
complain_overflow_signed, /* complain_on_overflow. */
|
||
bfd_elf_generic_reloc, /* special_function. */
|
||
"R_MOXIE_PCREL10", /* name. */
|
||
FALSE, /* partial_inplace. */
|
||
0, /* src_mask. */
|
||
0x000003FF, /* dst_mask. */
|
||
TRUE), /* pcrel_offset. */
|
||
};
|
||
|
||
/* Map BFD reloc types to MOXIE ELF reloc types. */
|
||
|
||
struct moxie_reloc_map
|
||
{
|
||
bfd_reloc_code_real_type bfd_reloc_val;
|
||
unsigned int moxie_reloc_val;
|
||
};
|
||
|
||
static const struct moxie_reloc_map moxie_reloc_map [] =
|
||
{
|
||
{ BFD_RELOC_NONE, R_MOXIE_NONE },
|
||
{ BFD_RELOC_32, R_MOXIE_32 },
|
||
{ BFD_RELOC_MOXIE_10_PCREL, R_MOXIE_PCREL10 },
|
||
};
|
||
|
||
static reloc_howto_type *
|
||
moxie_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
|
||
bfd_reloc_code_real_type code)
|
||
{
|
||
unsigned int i;
|
||
|
||
for (i = sizeof (moxie_reloc_map) / sizeof (moxie_reloc_map[0]);
|
||
--i;)
|
||
if (moxie_reloc_map [i].bfd_reloc_val == code)
|
||
return & moxie_elf_howto_table [moxie_reloc_map[i].moxie_reloc_val];
|
||
|
||
return NULL;
|
||
}
|
||
|
||
static reloc_howto_type *
|
||
moxie_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name)
|
||
{
|
||
unsigned int i;
|
||
|
||
for (i = 0;
|
||
i < sizeof (moxie_elf_howto_table) / sizeof (moxie_elf_howto_table[0]);
|
||
i++)
|
||
if (moxie_elf_howto_table[i].name != NULL
|
||
&& strcasecmp (moxie_elf_howto_table[i].name, r_name) == 0)
|
||
return &moxie_elf_howto_table[i];
|
||
|
||
return NULL;
|
||
}
|
||
|
||
/* Set the howto pointer for an MOXIE ELF reloc. */
|
||
|
||
static void
|
||
moxie_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED,
|
||
arelent *cache_ptr,
|
||
Elf_Internal_Rela *dst)
|
||
{
|
||
unsigned int r_type;
|
||
|
||
r_type = ELF32_R_TYPE (dst->r_info);
|
||
BFD_ASSERT (r_type < (unsigned int) R_MOXIE_max);
|
||
cache_ptr->howto = & moxie_elf_howto_table [r_type];
|
||
}
|
||
|
||
/* Perform a single relocation. By default we use the standard BFD
|
||
routines, but a few relocs, we have to do them ourselves. */
|
||
|
||
static bfd_reloc_status_type
|
||
moxie_final_link_relocate (reloc_howto_type *howto,
|
||
bfd *input_bfd,
|
||
asection *input_section,
|
||
bfd_byte *contents,
|
||
Elf_Internal_Rela *rel,
|
||
bfd_vma relocation)
|
||
{
|
||
bfd_reloc_status_type r = bfd_reloc_ok;
|
||
|
||
switch (howto->type)
|
||
{
|
||
default:
|
||
r = _bfd_final_link_relocate (howto, input_bfd, input_section,
|
||
contents, rel->r_offset,
|
||
relocation, rel->r_addend);
|
||
}
|
||
|
||
return r;
|
||
}
|
||
|
||
/* Relocate an MOXIE ELF section.
|
||
|
||
The RELOCATE_SECTION function is called by the new ELF backend linker
|
||
to handle the relocations for a section.
|
||
|
||
The relocs are always passed as Rela structures; if the section
|
||
actually uses Rel structures, the r_addend field will always be
|
||
zero.
|
||
|
||
This function is responsible for adjusting the section contents as
|
||
necessary, and (if using Rela relocs and generating a relocatable
|
||
output file) adjusting the reloc addend as necessary.
|
||
|
||
This function does not have to worry about setting the reloc
|
||
address or the reloc symbol index.
|
||
|
||
LOCAL_SYMS is a pointer to the swapped in local symbols.
|
||
|
||
LOCAL_SECTIONS is an array giving the section in the input file
|
||
corresponding to the st_shndx field of each local symbol.
|
||
|
||
The global hash table entry for the global symbols can be found
|
||
via elf_sym_hashes (input_bfd).
|
||
|
||
When generating relocatable output, this function must handle
|
||
STB_LOCAL/STT_SECTION symbols specially. The output symbol is
|
||
going to be the section symbol corresponding to the output
|
||
section, which means that the addend must be adjusted
|
||
accordingly. */
|
||
|
||
static bfd_boolean
|
||
moxie_elf_relocate_section (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;
|
||
Elf_Internal_Rela *relend;
|
||
|
||
symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
|
||
sym_hashes = elf_sym_hashes (input_bfd);
|
||
relend = relocs + input_section->reloc_count;
|
||
|
||
for (rel = relocs; rel < relend; rel ++)
|
||
{
|
||
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;
|
||
const char *name;
|
||
int r_type;
|
||
|
||
r_type = ELF32_R_TYPE (rel->r_info);
|
||
r_symndx = ELF32_R_SYM (rel->r_info);
|
||
howto = moxie_elf_howto_table + r_type;
|
||
h = NULL;
|
||
sym = NULL;
|
||
sec = NULL;
|
||
|
||
if (r_symndx < symtab_hdr->sh_info)
|
||
{
|
||
sym = local_syms + r_symndx;
|
||
sec = local_sections [r_symndx];
|
||
relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
|
||
|
||
name = bfd_elf_string_from_elf_section
|
||
(input_bfd, symtab_hdr->sh_link, sym->st_name);
|
||
name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
|
||
}
|
||
else
|
||
{
|
||
bfd_boolean unresolved_reloc, warned, ignored;
|
||
|
||
RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
|
||
r_symndx, symtab_hdr, sym_hashes,
|
||
h, sec, relocation,
|
||
unresolved_reloc, warned, ignored);
|
||
|
||
name = h->root.root.string;
|
||
}
|
||
|
||
if (sec != NULL && discarded_section (sec))
|
||
RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
|
||
rel, 1, relend, howto, 0, contents);
|
||
|
||
if (info->relocatable)
|
||
continue;
|
||
|
||
r = moxie_final_link_relocate (howto, input_bfd, input_section,
|
||
contents, rel, relocation);
|
||
|
||
if (r != bfd_reloc_ok)
|
||
{
|
||
const char * msg = NULL;
|
||
|
||
switch (r)
|
||
{
|
||
case bfd_reloc_overflow:
|
||
r = info->callbacks->reloc_overflow
|
||
(info, (h ? &h->root : NULL), name, howto->name,
|
||
(bfd_vma) 0, input_bfd, input_section, rel->r_offset);
|
||
break;
|
||
|
||
case bfd_reloc_undefined:
|
||
r = info->callbacks->undefined_symbol
|
||
(info, name, input_bfd, input_section, rel->r_offset,
|
||
TRUE);
|
||
break;
|
||
|
||
case bfd_reloc_outofrange:
|
||
msg = _("internal error: out of range error");
|
||
break;
|
||
|
||
case bfd_reloc_notsupported:
|
||
msg = _("internal error: unsupported relocation error");
|
||
break;
|
||
|
||
case bfd_reloc_dangerous:
|
||
msg = _("internal error: dangerous relocation");
|
||
break;
|
||
|
||
default:
|
||
msg = _("internal error: unknown error");
|
||
break;
|
||
}
|
||
|
||
if (msg)
|
||
r = info->callbacks->warning
|
||
(info, msg, name, input_bfd, input_section, rel->r_offset);
|
||
|
||
if (! r)
|
||
return FALSE;
|
||
}
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Return the section that should be marked against GC for a given
|
||
relocation. */
|
||
|
||
static asection *
|
||
moxie_elf_gc_mark_hook (asection *sec,
|
||
struct bfd_link_info *info,
|
||
Elf_Internal_Rela *rel,
|
||
struct elf_link_hash_entry *h,
|
||
Elf_Internal_Sym *sym)
|
||
{
|
||
return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
|
||
}
|
||
|
||
/* Look through the relocs for a section during the first phase.
|
||
Since we don't do .gots or .plts, we just need to consider the
|
||
virtual table relocs for gc. */
|
||
|
||
static bfd_boolean
|
||
moxie_elf_check_relocs (bfd *abfd,
|
||
struct bfd_link_info *info,
|
||
asection *sec,
|
||
const Elf_Internal_Rela *relocs)
|
||
{
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
struct elf_link_hash_entry **sym_hashes;
|
||
const Elf_Internal_Rela *rel;
|
||
const Elf_Internal_Rela *rel_end;
|
||
|
||
if (info->relocatable)
|
||
return TRUE;
|
||
|
||
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
||
sym_hashes = elf_sym_hashes (abfd);
|
||
|
||
rel_end = relocs + sec->reloc_count;
|
||
for (rel = relocs; rel < rel_end; rel++)
|
||
{
|
||
struct elf_link_hash_entry *h;
|
||
unsigned long r_symndx;
|
||
|
||
r_symndx = ELF32_R_SYM (rel->r_info);
|
||
if (r_symndx < symtab_hdr->sh_info)
|
||
h = NULL;
|
||
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;
|
||
|
||
/* PR15323, ref flags aren't set for references in the same
|
||
object. */
|
||
h->root.non_ir_ref = 1;
|
||
}
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
#define ELF_ARCH bfd_arch_moxie
|
||
#define ELF_MACHINE_CODE EM_MOXIE
|
||
#define ELF_MAXPAGESIZE 0x1
|
||
|
||
#define TARGET_BIG_SYM bfd_elf32_bigmoxie_vec
|
||
#define TARGET_BIG_NAME "elf32-bigmoxie"
|
||
#define TARGET_LITTLE_SYM bfd_elf32_littlemoxie_vec
|
||
#define TARGET_LITTLE_NAME "elf32-littlemoxie"
|
||
|
||
#define elf_info_to_howto_rel NULL
|
||
#define elf_info_to_howto moxie_info_to_howto_rela
|
||
#define elf_backend_relocate_section moxie_elf_relocate_section
|
||
#define elf_backend_gc_mark_hook moxie_elf_gc_mark_hook
|
||
#define elf_backend_check_relocs moxie_elf_check_relocs
|
||
|
||
#define elf_backend_can_gc_sections 1
|
||
#define elf_backend_rela_normal 1
|
||
|
||
#define bfd_elf32_bfd_reloc_type_lookup moxie_reloc_type_lookup
|
||
#define bfd_elf32_bfd_reloc_name_lookup moxie_reloc_name_lookup
|
||
|
||
#include "elf32-target.h"
|