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binutils-gdb/bfd/elf32-fr30.c

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/* FR30-specific support for 32-bit ELF.
Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
2010, 2012
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/fr30.h"
/* Forward declarations. */
static bfd_reloc_status_type
fr30_elf_i20_reloc (bfd *, arelent *, asymbol *, void * data,
asection *, bfd *, char **error_message);
static bfd_reloc_status_type
fr30_elf_i32_reloc (bfd *, arelent *, asymbol *, void *,
asection *, bfd *, char **);
static reloc_howto_type fr30_elf_howto_table [] =
{
/* This reloc does nothing. */
HOWTO (R_FR30_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_FR30_NONE", /* name */
FALSE, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
FALSE), /* pcrel_offset */
/* An 8 bit absolute relocation. */
HOWTO (R_FR30_8, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
FALSE, /* pc_relative */
4, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_FR30_8", /* name */
FALSE, /* partial_inplace */
0x0000, /* src_mask */
0x0ff0, /* dst_mask */
FALSE), /* pcrel_offset */
/* A 20 bit absolute relocation. */
HOWTO (R_FR30_20, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
20, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
fr30_elf_i20_reloc, /* special_function */
"R_FR30_20", /* name */
FALSE, /* partial_inplace */
0x00000000, /* src_mask */
0x00f0ffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* A 32 bit absolute relocation. */
HOWTO (R_FR30_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_FR30_32", /* name */
FALSE, /* partial_inplace */
0x00000000, /* src_mask */
0xffffffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* A 32 bit into 48 bits absolute relocation. */
HOWTO (R_FR30_48, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
fr30_elf_i32_reloc, /* special_function */
"R_FR30_48", /* name */
FALSE, /* partial_inplace */
0x00000000, /* src_mask */
0xffffffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* A 6 bit absolute relocation. */
HOWTO (R_FR30_6_IN_4, /* type */
2, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
6, /* bitsize */
FALSE, /* pc_relative */
4, /* bitpos */
complain_overflow_unsigned, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_FR30_6_IN_4", /* name */
FALSE, /* partial_inplace */
0x0000, /* src_mask */
0x00f0, /* dst_mask */
FALSE), /* pcrel_offset */
/* An 8 bit absolute relocation. */
HOWTO (R_FR30_8_IN_8, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
FALSE, /* pc_relative */
4, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc,/* special_function */
"R_FR30_8_IN_8", /* name */
FALSE, /* partial_inplace */
0x0000, /* src_mask */
0x0ff0, /* dst_mask */
FALSE), /* pcrel_offset */
/* A 9 bit absolute relocation. */
HOWTO (R_FR30_9_IN_8, /* type */
1, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
9, /* bitsize */
FALSE, /* pc_relative */
4, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc,/* special_function */
"R_FR30_9_IN_8", /* name */
FALSE, /* partial_inplace */
0x0000, /* src_mask */
0x0ff0, /* dst_mask */
FALSE), /* pcrel_offset */
/* A 10 bit absolute relocation. */
HOWTO (R_FR30_10_IN_8, /* type */
2, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
10, /* bitsize */
FALSE, /* pc_relative */
4, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc,/* special_function */
"R_FR30_10_IN_8", /* name */
FALSE, /* partial_inplace */
0x0000, /* src_mask */
0x0ff0, /* dst_mask */
FALSE), /* pcrel_offset */
/* A PC relative 9 bit relocation, right shifted by 1. */
HOWTO (R_FR30_9_PCREL, /* type */
1, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
9, /* bitsize */
TRUE, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_FR30_9_PCREL", /* name */
FALSE, /* partial_inplace */
0x0000, /* src_mask */
0x00ff, /* dst_mask */
FALSE), /* pcrel_offset */
/* A PC relative 12 bit relocation, right shifted by 1. */
HOWTO (R_FR30_12_PCREL, /* type */
1, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
12, /* bitsize */
TRUE, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_FR30_12_PCREL", /* name */
FALSE, /* partial_inplace */
0x0000, /* src_mask */
0x07ff, /* dst_mask */
FALSE), /* pcrel_offset */
/* GNU extension to record C++ vtable hierarchy */
HOWTO (R_FR30_GNU_VTINHERIT, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
NULL, /* special_function */
"R_FR30_GNU_VTINHERIT", /* name */
FALSE, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
FALSE), /* pcrel_offset */
/* GNU extension to record C++ vtable member usage */
HOWTO (R_FR30_GNU_VTENTRY, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
_bfd_elf_rel_vtable_reloc_fn, /* special_function */
"R_FR30_GNU_VTENTRY", /* name */
FALSE, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
FALSE), /* pcrel_offset */
};
/* Utility to actually perform an R_FR30_20 reloc. */
static bfd_reloc_status_type
fr30_elf_i20_reloc (bfd *abfd,
arelent *reloc_entry,
asymbol *symbol,
void * data,
asection *input_section,
bfd *output_bfd,
char **error_message ATTRIBUTE_UNUSED)
{
bfd_vma relocation;
unsigned long x;
/* This part is from bfd_elf_generic_reloc. */
if (output_bfd != (bfd *) NULL
&& (symbol->flags & BSF_SECTION_SYM) == 0
&& (! reloc_entry->howto->partial_inplace
|| reloc_entry->addend == 0))
{
reloc_entry->address += input_section->output_offset;
return bfd_reloc_ok;
}
if (output_bfd != NULL)
/* FIXME: See bfd_perform_relocation. Is this right? */
return bfd_reloc_ok;
relocation =
symbol->value
+ symbol->section->output_section->vma
+ symbol->section->output_offset
+ reloc_entry->addend;
if (relocation > (((bfd_vma) 1 << 20) - 1))
return bfd_reloc_overflow;
x = bfd_get_32 (abfd, (char *) data + reloc_entry->address);
x = (x & 0xff0f0000) | (relocation & 0x0000ffff) | ((relocation & 0x000f0000) << 4);
bfd_put_32 (abfd, (bfd_vma) x, (char *) data + reloc_entry->address);
return bfd_reloc_ok;
}
/* Utility to actually perform a R_FR30_48 reloc. */
static bfd_reloc_status_type
fr30_elf_i32_reloc (bfd *abfd,
arelent *reloc_entry,
asymbol *symbol,
void * data,
asection *input_section,
bfd *output_bfd,
char **error_message ATTRIBUTE_UNUSED)
{
bfd_vma relocation;
/* This part is from bfd_elf_generic_reloc. */
if (output_bfd != (bfd *) NULL
&& (symbol->flags & BSF_SECTION_SYM) == 0
&& (! reloc_entry->howto->partial_inplace
|| reloc_entry->addend == 0))
{
reloc_entry->address += input_section->output_offset;
return bfd_reloc_ok;
}
if (output_bfd != NULL)
/* FIXME: See bfd_perform_relocation. Is this right? */
return bfd_reloc_ok;
relocation =
symbol->value
+ symbol->section->output_section->vma
+ symbol->section->output_offset
+ reloc_entry->addend;
bfd_put_32 (abfd, relocation, (char *) data + reloc_entry->address + 2);
return bfd_reloc_ok;
}
/* Map BFD reloc types to FR30 ELF reloc types. */
struct fr30_reloc_map
{
bfd_reloc_code_real_type bfd_reloc_val;
unsigned int fr30_reloc_val;
};
static const struct fr30_reloc_map fr30_reloc_map [] =
{
{ BFD_RELOC_NONE, R_FR30_NONE },
{ BFD_RELOC_8, R_FR30_8 },
{ BFD_RELOC_FR30_20, R_FR30_20 },
{ BFD_RELOC_32, R_FR30_32 },
{ BFD_RELOC_FR30_48, R_FR30_48 },
{ BFD_RELOC_FR30_6_IN_4, R_FR30_6_IN_4 },
{ BFD_RELOC_FR30_8_IN_8, R_FR30_8_IN_8 },
{ BFD_RELOC_FR30_9_IN_8, R_FR30_9_IN_8 },
{ BFD_RELOC_FR30_10_IN_8, R_FR30_10_IN_8 },
{ BFD_RELOC_FR30_9_PCREL, R_FR30_9_PCREL },
{ BFD_RELOC_FR30_12_PCREL, R_FR30_12_PCREL },
{ BFD_RELOC_VTABLE_INHERIT, R_FR30_GNU_VTINHERIT },
{ BFD_RELOC_VTABLE_ENTRY, R_FR30_GNU_VTENTRY },
};
static reloc_howto_type *
fr30_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
bfd_reloc_code_real_type code)
{
unsigned int i;
for (i = sizeof (fr30_reloc_map) / sizeof (fr30_reloc_map[0]);
--i;)
if (fr30_reloc_map [i].bfd_reloc_val == code)
return & fr30_elf_howto_table [fr30_reloc_map[i].fr30_reloc_val];
return NULL;
}
static reloc_howto_type *
fr30_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name)
{
unsigned int i;
for (i = 0;
i < sizeof (fr30_elf_howto_table) / sizeof (fr30_elf_howto_table[0]);
i++)
if (fr30_elf_howto_table[i].name != NULL
&& strcasecmp (fr30_elf_howto_table[i].name, r_name) == 0)
return &fr30_elf_howto_table[i];
return NULL;
}
/* Set the howto pointer for an FR30 ELF reloc. */
static void
fr30_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_FR30_max);
cache_ptr->howto = & fr30_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
fr30_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;
bfd_vma x;
bfd_signed_vma srel;
switch (howto->type)
{
case R_FR30_20:
contents += rel->r_offset;
relocation += rel->r_addend;
if (relocation > ((1 << 20) - 1))
return bfd_reloc_overflow;
x = bfd_get_32 (input_bfd, contents);
x = (x & 0xff0f0000) | (relocation & 0x0000ffff) | ((relocation & 0x000f0000) << 4);
bfd_put_32 (input_bfd, x, contents);
break;
case R_FR30_48:
contents += rel->r_offset + 2;
relocation += rel->r_addend;
bfd_put_32 (input_bfd, relocation, contents);
break;
case R_FR30_9_PCREL:
contents += rel->r_offset + 1;
srel = (bfd_signed_vma) relocation;
srel += rel->r_addend;
srel -= rel->r_offset;
srel -= 2; /* Branch instructions add 2 to the PC... */
srel -= (input_section->output_section->vma +
input_section->output_offset);
if (srel & 1)
return bfd_reloc_outofrange;
if (srel > ((1 << 8) - 1) || (srel < - (1 << 8)))
return bfd_reloc_overflow;
bfd_put_8 (input_bfd, srel >> 1, contents);
break;
case R_FR30_12_PCREL:
contents += rel->r_offset;
srel = (bfd_signed_vma) relocation;
srel += rel->r_addend;
srel -= rel->r_offset;
srel -= 2; /* Branch instructions add 2 to the PC... */
srel -= (input_section->output_section->vma +
input_section->output_offset);
if (srel & 1)
return bfd_reloc_outofrange;
if (srel > ((1 << 11) - 1) || (srel < - (1 << 11)))
return bfd_reloc_overflow;
x = bfd_get_16 (input_bfd, contents);
x = (x & 0xf800) | ((srel >> 1) & 0x7ff);
bfd_put_16 (input_bfd, x, contents);
break;
default:
r = _bfd_final_link_relocate (howto, input_bfd, input_section,
contents, rel->r_offset,
relocation, rel->r_addend);
}
return r;
}
/* Relocate an FR30 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
fr30_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);
if ( r_type == R_FR30_GNU_VTINHERIT
|| r_type == R_FR30_GNU_VTENTRY)
continue;
r_symndx = ELF32_R_SYM (rel->r_info);
howto = fr30_elf_howto_table + ELF32_R_TYPE (rel->r_info);
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;
RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
r_symndx, symtab_hdr, sym_hashes,
h, sec, relocation,
unresolved_reloc, warned);
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 = fr30_final_link_relocate (howto, input_bfd, input_section,
contents, rel, relocation);
if (r != bfd_reloc_ok)
{
const char * msg = (const char *) 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 *
fr30_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)
{
if (h != NULL)
switch (ELF32_R_TYPE (rel->r_info))
{
case R_FR30_GNU_VTINHERIT:
case R_FR30_GNU_VTENTRY:
return NULL;
}
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
fr30_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;
}
switch (ELF32_R_TYPE (rel->r_info))
{
/* This relocation describes the C++ object vtable hierarchy.
Reconstruct it for later use during GC. */
case R_FR30_GNU_VTINHERIT:
if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
return FALSE;
break;
/* This relocation describes which C++ vtable entries are actually
used. Record for later use during GC. */
case R_FR30_GNU_VTENTRY:
BFD_ASSERT (h != NULL);
if (h != NULL
&& !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
return FALSE;
break;
}
}
return TRUE;
}
#define ELF_ARCH bfd_arch_fr30
#define ELF_MACHINE_CODE EM_FR30
#define ELF_MACHINE_ALT1 EM_CYGNUS_FR30
#define ELF_MAXPAGESIZE 0x1000
#define TARGET_BIG_SYM bfd_elf32_fr30_vec
#define TARGET_BIG_NAME "elf32-fr30"
#define elf_info_to_howto_rel NULL
#define elf_info_to_howto fr30_info_to_howto_rela
#define elf_backend_relocate_section fr30_elf_relocate_section
#define elf_backend_gc_mark_hook fr30_elf_gc_mark_hook
#define elf_backend_check_relocs fr30_elf_check_relocs
#define elf_backend_can_gc_sections 1
#define elf_backend_rela_normal 1
#define bfd_elf32_bfd_reloc_type_lookup fr30_reloc_type_lookup
#define bfd_elf32_bfd_reloc_name_lookup fr30_reloc_name_lookup
#include "elf32-target.h"
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