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binutils-gdb/bfd/elf32-d30v.c
Richard Henderson b51a133817 * elf32-d30v.c (bfd_elf_d30v_reloc): Don't modify section 
contents when performing a partial link.
        (bfd_elf_d30v_reloc_21): Likewise.
2000-04-21 17:25:29 +00:00

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/* D30V-specific support for 32-bit ELF
Copyright (C) 1997, 98, 99, 2000 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 void d30v_info_to_howto_rela
PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
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));
static bfd_reloc_status_type bfd_elf_d30v_reloc_21 PARAMS ((
bfd *abfd,
arelent *reloc_entry,
asymbol *symbol,
PTR data,
asection *input_section,
bfd *output_bfd,
char **error_message));
enum reloc_type
{
R_D30V_NONE = 0,
R_D30V_6,
R_D30V_9_PCREL,
R_D30V_9_PCREL_R,
R_D30V_15,
R_D30V_15_PCREL,
R_D30V_15_PCREL_R,
R_D30V_21,
R_D30V_21_PCREL,
R_D30V_21_PCREL_R,
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 */
/* A relative 9 bit relocation, right shifted by 3 */
HOWTO (R_D30V_9_PCREL, /* type */
3, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
6, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_d30v_reloc_21, /* special_function */
"R_D30V_9_PCREL", /* name */
false, /* partial_inplace */
0x3f, /* src_mask */
0x3f, /* dst_mask */
true), /* pcrel_offset */
/* A relative 9 bit relocation, right shifted by 3 */
HOWTO (R_D30V_9_PCREL_R, /* type */
3, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
6, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_d30v_reloc_21, /* special_function */
"R_D30V_9_PCREL_R", /* name */
false, /* partial_inplace */
0x3f, /* src_mask */
0x3f, /* dst_mask */
true), /* 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) */
12, /* 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) */
12, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_d30v_reloc_21, /* special_function */
"R_D30V_15_PCREL", /* name */
false, /* partial_inplace */
0xfff, /* src_mask */
0xfff, /* dst_mask */
true), /* pcrel_offset */
/* A relative 15 bit relocation, right shifted by 3 */
HOWTO (R_D30V_15_PCREL_R, /* type */
3, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
12, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_d30v_reloc_21, /* special_function */
"R_D30V_15_PCREL_R", /* 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, /* type */
3, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
18, /* 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) */
18, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_d30v_reloc_21, /* special_function */
"R_D30V_21_PCREL", /* name */
false, /* partial_inplace */
0x3ffff, /* src_mask */
0x3ffff, /* dst_mask */
true), /* pcrel_offset */
/* A relative 21 bit relocation, right shifted by 3, in the Right container */
HOWTO (R_D30V_21_PCREL_R, /* type */
3, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
18, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_d30v_reloc_21, /* special_function */
"R_D30V_21_PCREL_R", /* 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 */
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_32_NORMAL", /* name */
false, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
};
#define MAX32 ((bfd_signed_vma) 0x7fffffff)
#define MIN32 (- MAX32 - 1)
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_signed_vma relocation;
bfd_vma in1, in2, num;
bfd_vma tmp_addr = 0;
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;
int make_absolute = 0;
if (output_bfd != (bfd *) NULL)
{
/* Partial linking -- do nothing. */
reloc_entry->address += input_section->output_offset;
return bfd_reloc_ok;
}
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 */
if (bfd_is_und_section (symbol->section)
&& (symbol->flags & BSF_WEAK) == 0
&& output_bfd == (bfd *) NULL)
flag = bfd_reloc_undefined;
/* 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. */
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)
{
tmp_addr = input_section->output_section->vma + input_section->output_offset
+ reloc_entry->address;
relocation -= tmp_addr;
}
in1 = bfd_get_32 (abfd, (bfd_byte *) data + addr);
in2 = bfd_get_32 (abfd, (bfd_byte *) data + addr + 4);
/* extract the addend */
num = ((in2 & 0x3FFFF)
| ((in2 & 0xFF00000) >> 2)
| ((in1 & 0x3F) << 26));
in1 &= 0xFFFFFFC0;
in2 = 0x80000000;
relocation += num;
if (howto->pc_relative == true && howto->bitsize == 32)
{
/* The D30V has a PC that doesn't wrap and PC-relative jumps are
signed, so a PC-relative jump can't be more than +/- 2^31 bytes.
If one exceeds this, change it to an absolute jump. */
if (relocation > MAX32 || relocation < MIN32)
{
relocation = (relocation + tmp_addr) & 0xffffffff;
make_absolute = 1;
}
}
in1 |= (relocation >> 26) & 0x3F; /* top 6 bits */
in2 |= ((relocation & 0x03FC0000) << 2); /* next 8 bits */
in2 |= relocation & 0x0003FFFF; /* bottom 18 bits */
/* change a PC-relative instruction to its absolute equivalent */
/* with this simple hack */
if (make_absolute)
in1 |= 0x00100000;
bfd_put_32 (abfd, in1, (bfd_byte *) data + addr);
bfd_put_32 (abfd, in2, (bfd_byte *) data + addr + 4);
return flag;
}
static bfd_reloc_status_type
bfd_elf_d30v_reloc_21 (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, num;
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;
int mask, max;
if (output_bfd != (bfd *) NULL)
{
/* Partial linking -- do nothing. */
reloc_entry->address += input_section->output_offset;
return bfd_reloc_ok;
}
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 */
if (bfd_is_und_section (symbol->section)
&& (symbol->flags & BSF_WEAK) == 0
&& output_bfd == (bfd *) NULL)
flag = bfd_reloc_undefined;
/* 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. */
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;
}
in1 = bfd_get_32 (abfd, (bfd_byte *) data + addr);
mask = (1 << howto->bitsize) - 1;
if (howto->bitsize == 6)
mask <<= 12;
max = (1 << (howto->bitsize + 2)) - 1;
/* extract the addend */
num = in1 & mask; /* 18 bits */
if (howto->bitsize == 6)
num >>= 12;
num <<= 3; /* shift left 3 */
in1 &= ~mask; /* mask out addend */
relocation += num;
if (howto->type == R_D30V_21_PCREL_R || howto->type == R_D30V_15_PCREL_R ||
howto->type == R_D30V_9_PCREL_R )
{
relocation += 4;
}
if ((int)relocation < 0 )
{
if (~(int)relocation > max)
flag = bfd_reloc_overflow;
}
else
{
if ((int)relocation > max)
flag = bfd_reloc_overflow;
}
relocation >>= 3;
if (howto->bitsize == 6)
in1 |= ((relocation & (mask >> 12)) << 12);
else
in1 |= relocation & mask;
bfd_put_32 (abfd, in1, (bfd_byte *) data + addr);
return flag;
}
/* Map BFD reloc types to D30V ELF reloc types. */
struct d30v_reloc_map
{
bfd_reloc_code_real_type 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_9_PCREL, R_D30V_9_PCREL },
{ BFD_RELOC_D30V_9_PCREL_R, R_D30V_9_PCREL_R },
{ BFD_RELOC_D30V_15, R_D30V_15 },
{ BFD_RELOC_D30V_15_PCREL, R_D30V_15_PCREL },
{ BFD_RELOC_D30V_15_PCREL_R, R_D30V_15_PCREL_R },
{ BFD_RELOC_D30V_21, R_D30V_21 },
{ BFD_RELOC_D30V_21_PCREL, R_D30V_21_PCREL },
{ BFD_RELOC_D30V_21_PCREL_R, R_D30V_21_PCREL_R },
{ 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 ATTRIBUTE_UNUSED;
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 (type REL). */
static void
d30v_info_to_howto_rel (abfd, cache_ptr, dst)
bfd *abfd ATTRIBUTE_UNUSED;
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];
}
/* Set the howto pointer for an D30V ELF reloc (type RELA). */
static void
d30v_info_to_howto_rela (abfd, cache_ptr, dst)
bfd *abfd ATTRIBUTE_UNUSED;
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_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 d30v_info_to_howto_rela
#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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