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binutils-gdb/bfd/elf32-mn10200.c

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/* Matsushita 10200 specific support for 32-bit ELF
Copyright (C) 1996 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"
static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
static void mn10200_info_to_howto
PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
static bfd_reloc_status_type bfd_elf32_mn10200_reloc
PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
/* We have to use RELA instructions since md_apply_fix3 in the assembler
does absolutely nothing. */
#define USE_RELA
enum reloc_type
{
R_MN10200_NONE = 0,
R_MN10200_32,
R_MN10200_16,
R_MN10200_8,
#if 0
R_MN10200_PCREL32_1BYTE,
R_MN10200_PCREL16_1BYTE,
R_MN10200_PCREL8_1BYTE,
R_MN10200_PCREL32_2BYTE,
R_MN10200_PCREL16_2BYTE,
#endif
R_MN10200_MAX
};
static reloc_howto_type elf_mn10200_howto_table[] =
{
/* Dummy relocation. Does nothing. */
HOWTO (R_MN10200_NONE,
0,
2,
16,
false,
0,
complain_overflow_bitfield,
bfd_elf_generic_reloc,
"R_MN10200_NONE",
false,
0,
0,
false),
/* Standard 32 bit reloc. */
HOWTO (R_MN10200_32,
0,
2,
32,
false,
0,
complain_overflow_bitfield,
bfd_elf_generic_reloc,
"R_MN10200_32",
false,
0xffffffff,
0xffffffff,
false),
/* Standard 16 bit reloc. */
HOWTO (R_MN10200_16,
0,
1,
16,
false,
0,
complain_overflow_bitfield,
bfd_elf_generic_reloc,
"R_MN10200_16",
false,
0xffff,
0xffff,
false),
/* Standard 8 bit reloc. */
HOWTO (R_MN10200_8,
0,
0,
8,
false,
0,
complain_overflow_bitfield,
bfd_elf_generic_reloc,
"R_MN10200_8",
false,
0xff,
0xff,
false),
#if 0
/* Simple 32bit pc-relative reloc with a 1 byte adjustment
to get the pc-relative offset correct. */
HOWTO (R_MN10200_PCREL32_1BYTE,
0,
2,
32,
true,
0,
complain_overflow_bitfield,
bfd_elf32_mn10200_reloc,
"R_MN10200_PCREL32_1BYTE",
true,
0xffffffff,
0xffffffff,
false),
/* Simple 16bit pc-relative reloc with a 1 byte adjustment
to get the pc-relative offset correct. */
HOWTO (R_MN10200_PCREL16_1BYTE,
0,
1,
16,
true,
0,
complain_overflow_bitfield,
bfd_elf32_mn10200_reloc,
"R_MN10200_PCREL16_1BYTE",
true,
0xffff,
0xffff,
false),
/* Simple 8 pc-relative reloc with a 1 byte adjustment
to get the pc-relative offset correct. */
HOWTO (R_MN10200_PCREL8_1BYTE,
0,
0,
8,
true,
0,
complain_overflow_bitfield,
bfd_elf32_mn10200_reloc,
"R_MN10200_PCREL8_1BYTE",
true,
0xff,
0xff,
true),
/* Simple 32 pc-relative reloc with a 2 byte adjustment
to get the pc-relative offset correct. */
HOWTO (R_MN10200_PCREL32_2BYTE,
0,
2,
32,
true,
0,
complain_overflow_bitfield,
bfd_elf32_mn10200_reloc,
"R_MN10200_PCREL32_2BYTE",
true,
0xffffffff,
0xffffffff,
true),
/* Simple 16 pc-relative reloc with a 2 byte adjustment
to get the pc-relative offset correct. */
HOWTO (R_MN10200_PCREL16_2BYTE,
0,
1,
16,
true,
0,
complain_overflow_bitfield,
bfd_elf32_mn10200_reloc,
"R_MN10200_PCREL16_2BYTE",
true,
0xffff,
0xffff,
true),
#endif
};
struct mn10200_reloc_map
{
unsigned char bfd_reloc_val;
unsigned char elf_reloc_val;
};
static const struct mn10200_reloc_map mn10200_reloc_map[] =
{
{ BFD_RELOC_NONE, R_MN10200_NONE, },
{ BFD_RELOC_32, R_MN10200_32, },
{ BFD_RELOC_16, R_MN10200_16, },
{ BFD_RELOC_8, R_MN10200_8, },
#if 0
{ BFD_RELOC_MN10200_32B, R_MN10200_32B, },
{ BFD_RELOC_MN10200_16B, R_MN10200_16B, },
{ BFD_RELOC_32_PCREL, R_MN10200_PCREL32_1BYTE, },
{ BFD_RELOC_16_PCREL, R_MN10200_PCREL16_1BYTE, },
{ BFD_RELOC_8_PCREL, R_MN10200_PCREL8_1BYTE, },
{ BFD_RELOC_MN10200_32_PCREL, R_MN10200_PCREL32_2BYTE, },
{ BFD_RELOC_MN10200_16_PCREL, R_MN10200_PCREL16_2BYTE, },
#endif
};
static reloc_howto_type *
bfd_elf32_bfd_reloc_type_lookup (abfd, code)
bfd *abfd;
bfd_reloc_code_real_type code;
{
unsigned int i;
for (i = 0;
i < sizeof (mn10200_reloc_map) / sizeof (struct mn10200_reloc_map);
i++)
{
if (mn10200_reloc_map[i].bfd_reloc_val == code)
return &elf_mn10200_howto_table[mn10200_reloc_map[i].elf_reloc_val];
}
return NULL;
}
/* Set the howto pointer for an MN10200 ELF reloc. */
static void
mn10200_info_to_howto (abfd, cache_ptr, dst)
bfd *abfd;
arelent *cache_ptr;
Elf32_Internal_Rela *dst;
{
unsigned int r_type;
r_type = ELF32_R_TYPE (dst->r_info);
BFD_ASSERT (r_type < (unsigned int) R_MN10200_MAX);
cache_ptr->howto = &elf_mn10200_howto_table[r_type];
}
static bfd_reloc_status_type
bfd_elf32_mn10200_reloc (abfd, reloc, symbol, data, isection, obfd, err)
bfd *abfd;
arelent *reloc;
asymbol *symbol;
PTR data;
asection *isection;
bfd *obfd;
char **err;
{
if (obfd != (bfd *) NULL
&& (symbol->flags & BSF_SECTION_SYM) == 0
&& (! reloc->howto->partial_inplace
|| reloc->addend == 0))
{
reloc->address += isection->output_offset;
return bfd_reloc_ok;
}
else if (obfd != NULL)
{
return bfd_reloc_continue;
}
#if 0
/* Catch relocs involving undefined symbols. */
if (bfd_is_und_section (symbol->section)
&& (symbol->flags & BSF_WEAK) == 0
&& obfd == NULL)
return bfd_reloc_undefined;
/* We handle final linking of some relocs ourselves. */
{
long relocation;
/* Is the address of the relocation really within the section? */
if (reloc->address > isection->_cooked_size)
return bfd_reloc_outofrange;
/* Work out which section the relocation is targetted at and the
initial relocation command value. */
/* Get symbol value. (Common symbols are special.) */
if (bfd_is_com_section (symbol->section))
relocation = 0;
else
relocation = symbol->value;
/* Convert input-section-relative symbol value to absolute + addend. */
relocation += symbol->section->output_section->vma;
relocation += symbol->section->output_offset;
relocation += reloc->addend;
if (reloc->howto->pc_relative == true)
{
/* Here the variable relocation holds the final address of the
symbol we are relocating against, plus any addend. */
relocation -= isection->output_section->vma + isection->output_offset;
/* Deal with pcrel_offset */
relocation -= reloc->address;
if (reloc->howto->type == R_MN10200_PCREL32_1BYTE
|| reloc->howto->type == R_MN10200_PCREL16_1BYTE
|| reloc->howto->type == R_MN10200_PCREL8_1BYTE)
relocation += 1;
else if (reloc->howto->type == R_MN10200_PCREL32_2BYTE
|| reloc->howto->type == R_MN10200_PCREL16_2BYTE)
relocation += 2;
}
/* I've got no clue... */
reloc->addend = 0;
if (reloc->howto->size == 0)
{
if (relocation > 0x7f || relocation < -0x80)
return bfd_reloc_overflow;
bfd_put_8 (abfd, relocation & 0xff,
(bfd_byte *)data + reloc->address);
}
else if (reloc->howto->size == 1)
{
if (relocation > 0x7fff || relocation < -0x8000)
return bfd_reloc_overflow;
bfd_putb16 (relocation & 0xffff, (bfd_byte *)data + reloc->address);
}
else if (reloc->howto->size == 2)
bfd_putb32 (relocation, (bfd_byte *)data + reloc->address);
return bfd_reloc_ok;
}
#endif
return bfd_reloc_continue;
}
#define TARGET_LITTLE_SYM bfd_elf32_mn10200_vec
#define TARGET_LITTLE_NAME "elf32-mn10200"
#define ELF_ARCH bfd_arch_mn10200
#define ELF_MACHINE_CODE EM_CYGNUS_MN10200
#define ELF_MAXPAGESIZE 0x1000
#define elf_info_to_howto mn10200_info_to_howto
#define elf_info_to_howto_rel 0
#define elf_symbol_leading_char '_'
#include "elf32-target.h"
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