binutils-gdb/bfd/elf32-moxie.c

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/* moxie-specific support for 32-bit ELF.
Copyright (C) 2009-2020 Free Software Foundation, Inc.
Copied from elf32-fr30.c which is..
Copyright (C) 1998-2020 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 */
3, /* 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_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 bfd_boolean
moxie_info_to_howto_rela (bfd *abfd,
arelent *cache_ptr,
Elf_Internal_Rela *dst)
{
unsigned int r_type;
r_type = ELF32_R_TYPE (dst->r_info);
if (r_type >= (unsigned int) R_MOXIE_max)
{
/* xgettext:c-format */
_bfd_error_handler (_("%pB: unsupported relocation type %#x"),
abfd, r_type);
bfd_set_error (bfd_error_bad_value);
return FALSE;
}
cache_ptr->howto = & moxie_elf_howto_table [r_type];
return TRUE;
}
/* 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 (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 (bfd_link_relocatable (info))
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:
(*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:
(*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)
(*info->callbacks->warning) (info, msg, name, input_bfd,
input_section, rel->r_offset);
}
}
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 (bfd_link_relocatable (info))
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;
}
}
return TRUE;
}
#define ELF_ARCH bfd_arch_moxie
#define ELF_MACHINE_CODE EM_MOXIE
#define ELF_MACHINE_ALT1 EM_MOXIE_OLD
#define ELF_MAXPAGESIZE 0x1
#define TARGET_BIG_SYM moxie_elf32_be_vec
#define TARGET_BIG_NAME "elf32-bigmoxie"
#define TARGET_LITTLE_SYM moxie_elf32_le_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"