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/* ARC-specific support for 32-bit ELF
Copyright 1994, 1995, 1997, 1999, 2001, 2002, 2005, 2007
Free Software Foundation, Inc.
Contributed by Doug Evans (dje@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., 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/arc.h"
#include "libiberty.h"
/* Try to minimize the amount of space occupied by relocation tables
on the ROM (not that the ROM won't be swamped by other ELF overhead). */
#define USE_REL 1
static bfd_reloc_status_type
arc_elf_b22_pcrel (bfd * abfd,
arelent * reloc_entry,
asymbol * symbol,
void * data,
asection * input_section,
bfd * output_bfd,
char ** error_message)
{
/* If linking, back up the final symbol address by the address of the
reloc. This cannot be accomplished by setting the pcrel_offset
field to TRUE, as bfd_install_relocation will detect this and refuse
to install the offset in the first place, but bfd_perform_relocation
will still insist on removing it. */
if (output_bfd == NULL)
reloc_entry->addend -= reloc_entry->address;
/* Fall through to the default elf reloc handler. */
return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
input_section, output_bfd, error_message);
}
static reloc_howto_type elf_arc_howto_table[] =
{
/* This reloc does nothing. */
HOWTO (R_ARC_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_ARC_NONE", /* Name. */
TRUE, /* Partial_inplace. */
0, /* Src_mask. */
0, /* Dst_mask. */
FALSE), /* PCrel_offset. */
/* A standard 32 bit relocation. */
HOWTO (R_ARC_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_ARC_32", /* Name. */
TRUE, /* Partial_inplace. */
0xffffffff, /* Src_mask. */
0xffffffff, /* Dst_mask. */
FALSE), /* PCrel_offset. */
/* A 26 bit absolute branch, right shifted by 2. */
HOWTO (R_ARC_B26, /* Type. */
2, /* Rightshift. */
2, /* Size (0 = byte, 1 = short, 2 = long). */
26, /* Bitsize. */
FALSE, /* PC_relative. */
0, /* Bitpos. */
complain_overflow_bitfield, /* Complain_on_overflow. */
bfd_elf_generic_reloc, /* Special_function. */
"R_ARC_B26", /* Name. */
TRUE, /* Partial_inplace. */
0x00ffffff, /* Src_mask. */
0x00ffffff, /* Dst_mask. */
FALSE), /* PCrel_offset. */
/* A relative 22 bit branch; bits 21-2 are stored in bits 26-7. */
HOWTO (R_ARC_B22_PCREL, /* Type. */
2, /* Rightshift. */
2, /* Size (0 = byte, 1 = short, 2 = long). */
22, /* Bitsize. */
TRUE, /* PC_relative. */
7, /* Bitpos. */
complain_overflow_signed, /* Complain_on_overflow. */
arc_elf_b22_pcrel, /* Special_function. */
"R_ARC_B22_PCREL", /* Name. */
TRUE, /* Partial_inplace. */
0x07ffff80, /* Src_mask. */
0x07ffff80, /* Dst_mask. */
FALSE), /* PCrel_offset. */
};
/* Map BFD reloc types to ARC ELF reloc types. */
struct arc_reloc_map
{
bfd_reloc_code_real_type bfd_reloc_val;
unsigned char elf_reloc_val;
};
static const struct arc_reloc_map arc_reloc_map[] =
{
{ BFD_RELOC_NONE, R_ARC_NONE, },
{ BFD_RELOC_32, R_ARC_32 },
{ BFD_RELOC_CTOR, R_ARC_32 },
{ BFD_RELOC_ARC_B26, R_ARC_B26 },
{ BFD_RELOC_ARC_B22_PCREL, R_ARC_B22_PCREL },
};
static reloc_howto_type *
bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
bfd_reloc_code_real_type code)
{
unsigned int i;
for (i = ARRAY_SIZE (arc_reloc_map); i--;)
if (arc_reloc_map[i].bfd_reloc_val == code)
return elf_arc_howto_table + arc_reloc_map[i].elf_reloc_val;
return NULL;
}
static reloc_howto_type *
bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
const char *r_name)
{
unsigned int i;
for (i = 0;
i < sizeof (elf_arc_howto_table) / sizeof (elf_arc_howto_table[0]);
i++)
if (elf_arc_howto_table[i].name != NULL
&& strcasecmp (elf_arc_howto_table[i].name, r_name) == 0)
return &elf_arc_howto_table[i];
return NULL;
}
/* Set the howto pointer for an ARC ELF reloc. */
static void
arc_info_to_howto_rel (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_ARC_max);
cache_ptr->howto = &elf_arc_howto_table[r_type];
}
/* Set the right machine number for an ARC ELF file. */
static bfd_boolean
arc_elf_object_p (bfd *abfd)
{
unsigned int mach = bfd_mach_arc_6;
if (elf_elfheader(abfd)->e_machine == EM_ARC)
{
unsigned long arch = elf_elfheader (abfd)->e_flags & EF_ARC_MACH;
switch (arch)
{
case E_ARC_MACH_ARC5:
mach = bfd_mach_arc_5;
break;
default:
case E_ARC_MACH_ARC6:
mach = bfd_mach_arc_6;
break;
case E_ARC_MACH_ARC7:
mach = bfd_mach_arc_7;
break;
case E_ARC_MACH_ARC8:
mach = bfd_mach_arc_8;
break;
}
}
return bfd_default_set_arch_mach (abfd, bfd_arch_arc, mach);
}
/* The final processing done just before writing out an ARC ELF object file.
This gets the ARC architecture right based on the machine number. */
static void
arc_elf_final_write_processing (bfd *abfd,
bfd_boolean linker ATTRIBUTE_UNUSED)
{
unsigned long val;
switch (bfd_get_mach (abfd))
{
case bfd_mach_arc_5:
val = E_ARC_MACH_ARC5;
break;
default:
case bfd_mach_arc_6:
val = E_ARC_MACH_ARC6;
break;
case bfd_mach_arc_7:
val = E_ARC_MACH_ARC7;
break;
case bfd_mach_arc_8:
val = E_ARC_MACH_ARC8;
break;
}
elf_elfheader (abfd)->e_flags &=~ EF_ARC_MACH;
elf_elfheader (abfd)->e_flags |= val;
}
#define TARGET_LITTLE_SYM bfd_elf32_littlearc_vec
#define TARGET_LITTLE_NAME "elf32-littlearc"
#define TARGET_BIG_SYM bfd_elf32_bigarc_vec
#define TARGET_BIG_NAME "elf32-bigarc"
#define ELF_ARCH bfd_arch_arc
#define ELF_MACHINE_CODE EM_ARC
#define ELF_MAXPAGESIZE 0x1000
#define elf_info_to_howto 0
#define elf_info_to_howto_rel arc_info_to_howto_rel
#define elf_backend_object_p arc_elf_object_p
#define elf_backend_final_write_processing arc_elf_final_write_processing
#include "elf32-target.h"
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