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binutils-gdb/bfd/elf32-d30v.c

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/* D30V-specific support for 32-bit ELF
Copyright (C) 1997 Free Software Foundation, Inc.
Contributed by Martin Hunt (hunt@cygnus.com).
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 d30v_info_to_howto_rel
PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *));
static bfd_reloc_status_type bfd_elf_d30v_reloc PARAMS ((
bfd *abfd,
arelent *reloc_entry,
asymbol *symbol,
PTR data,
asection *input_section,
bfd *output_bfd,
char **error_message));
/* Use REL instead of RELA to save space */
#define USE_REL
enum reloc_type
{
R_D30V_NONE = 0,
R_D30V_6,
R_D30V_15,
R_D30V_15_PCREL,
R_D30V_21,
R_D30V_21_PCREL,
R_D30V_32,
R_D30V_32_PCREL,
R_D30V_32_NORMAL,
R_D30V_max
};
static reloc_howto_type elf_d30v_howto_table[] =
{
/* This reloc does nothing. */
HOWTO (R_D30V_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_D30V_NONE", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
/* A 6 bit absolute relocation */
HOWTO (R_D30V_6, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
6, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_D30V_6", /* name */
false, /* partial_inplace */
0x3f, /* src_mask */
0x3f, /* dst_mask */
false), /* pcrel_offset */
/* An absolute 15 bit relocation, right shifted by 3 */
HOWTO (R_D30V_15, /* type */
3, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
15, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_D30V_15", /* name */
false, /* partial_inplace */
0xfff, /* src_mask */
0xfff, /* dst_mask */
false), /* pcrel_offset */
/* A relative 15 bit relocation, right shifted by 3 */
HOWTO (R_D30V_15_PCREL, /* type */
3, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
15, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_D30V_15_PCREL", /* name */
false, /* partial_inplace */
0xfff, /* src_mask */
0xfff, /* dst_mask */
true), /* pcrel_offset */
/* An absolute 21 bit relocation, right shifted by 3 */
HOWTO (R_D30V_21_PCREL, /* type */
3, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
21, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_D30V_21", /* name */
false, /* partial_inplace */
0x3ffff, /* src_mask */
0x3ffff, /* dst_mask */
false), /* pcrel_offset */
/* A relative 21 bit relocation, right shifted by 3 */
HOWTO (R_D30V_21_PCREL, /* type */
3, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
21, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_D30V_21_PCREL", /* name */
false, /* partial_inplace */
0x3ffff, /* src_mask */
0x3ffff, /* dst_mask */
true), /* pcrel_offset */
/* A D30V 32 bit absolute relocation */
HOWTO (R_D30V_32, /* type */
0, /* rightshift */
4, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_d30v_reloc, /* special_function */
"R_D30V_32", /* name */
false, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* A relative 32 bit relocation */
HOWTO (R_D30V_32_PCREL, /* type */
0, /* rightshift */
4, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_d30v_reloc, /* special_function */
"R_D30V_32_PCREL", /* name */
false, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
true), /* pcrel_offset */
/* A regular 32 bit absolute relocation */
HOWTO (R_D30V_32_NORMAL, /* type */
0, /* rightshift */
4, /* 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_D30V_32_NORMAL", /* name */
false, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
};
static bfd_reloc_status_type
bfd_elf_d30v_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd, error_message)
bfd *abfd;
arelent *reloc_entry;
asymbol *symbol;
PTR data;
asection *input_section;
bfd *output_bfd;
char **error_message;
{
bfd_vma relocation;
bfd_vma in1, in2;
bfd_reloc_status_type r;
asection *reloc_target_output_section;
bfd_size_type addr = reloc_entry->address;
bfd_reloc_status_type flag = bfd_reloc_ok;
bfd_vma output_base = 0;
reloc_howto_type *howto = reloc_entry->howto;
r = bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
input_section, output_bfd, error_message);
if (r != bfd_reloc_continue)
return r;
/* a hacked-up version of bfd_perform_reloc() follows */
/* Is the address of the relocation really within the section? */
if (reloc_entry->address > input_section->_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;
reloc_target_output_section = symbol->section->output_section;
/* Convert input-section-relative symbol value to absolute. */
if (output_bfd)
output_base = 0;
else
output_base = reloc_target_output_section->vma;
relocation += output_base + symbol->section->output_offset;
/* Add in supplied addend. */
relocation += reloc_entry->addend;
/* Here the variable relocation holds the final address of the
symbol we are relocating against, plus any addend. */
if (howto->pc_relative == true)
{
relocation -= input_section->output_section->vma + input_section->output_offset;
if (howto->pcrel_offset == true)
relocation -= reloc_entry->address;
}
if (output_bfd != (bfd *) NULL)
{
/* This is a partial relocation, and we want to apply the relocation
to the reloc entry rather than the raw data. Modify the reloc
inplace to reflect what we now know. */
reloc_entry->addend = relocation;
reloc_entry->address += input_section->output_offset;
return flag;
}
else
reloc_entry->addend = 0;
in1 = bfd_get_32 (abfd, (bfd_byte *) data + addr);
in2 = bfd_get_32 (abfd, (bfd_byte *) data + addr + 4);
printf("D30V 32-bit reloc at addr 0x%lx insn=0x%08x%08x\n",(long)relocation, (int)in1, (int)in2);
bfd_put_32 (abfd, in1, (bfd_byte *) data + addr);
bfd_put_32 (abfd, in2, (bfd_byte *) data + addr + 4);
return flag;
}
/* Map BFD reloc types to D30V ELF reloc types. */
struct d30v_reloc_map
{
unsigned char bfd_reloc_val;
unsigned char elf_reloc_val;
};
static const struct d30v_reloc_map d30v_reloc_map[] =
{
{ BFD_RELOC_NONE, R_D30V_NONE, },
{ BFD_RELOC_D30V_6, R_D30V_6 },
{ BFD_RELOC_D30V_15, R_D30V_15 },
{ BFD_RELOC_D30V_15_PCREL, R_D30V_15_PCREL },
{ BFD_RELOC_D30V_21, R_D30V_21 },
{ BFD_RELOC_D30V_21_PCREL, R_D30V_21_PCREL },
{ BFD_RELOC_D30V_32, R_D30V_32 },
{ BFD_RELOC_D30V_32_PCREL, R_D30V_32_PCREL },
{ BFD_RELOC_32, R_D30V_32_NORMAL },
};
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 (d30v_reloc_map) / sizeof (struct d30v_reloc_map);
i++)
{
if (d30v_reloc_map[i].bfd_reloc_val == code)
return &elf_d30v_howto_table[d30v_reloc_map[i].elf_reloc_val];
}
return NULL;
}
/* Set the howto pointer for an D30V ELF reloc. */
static void
d30v_info_to_howto_rel (abfd, cache_ptr, dst)
bfd *abfd;
arelent *cache_ptr;
Elf32_Internal_Rel *dst;
{
unsigned int r_type;
r_type = ELF32_R_TYPE (dst->r_info);
BFD_ASSERT (r_type < (unsigned int) R_D30V_max);
cache_ptr->howto = &elf_d30v_howto_table[r_type];
}
#define ELF_ARCH bfd_arch_d30v
#define ELF_MACHINE_CODE EM_CYGNUS_D30V
#define ELF_MAXPAGESIZE 0x1000
#define TARGET_BIG_SYM bfd_elf32_d30v_vec
#define TARGET_BIG_NAME "elf32-d30v"
#define elf_info_to_howto 0
#define elf_info_to_howto_rel d30v_info_to_howto_rel
#define elf_backend_object_p 0
#define elf_backend_final_write_processing 0
#include "elf32-target.h"
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