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binutils-gdb/bfd/elf32-arc.c

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/* ARC-specific support for 32-bit ELF
Copyright (C) 1994, 1995 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"
#include "libelf.h"
#include "elf/arc.h"
static bfd_reloc_status_type arc_elf_unsupported_reloc
PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
static void arc_info_to_howto_rel
PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *));
static boolean arc_elf_object_p PARAMS ((bfd *));
static void arc_elf_final_write_processing PARAMS ((bfd *, boolean));
/* Try to minimize the amount of space occupied by relocation tables
on the ROM. */
#define USE_REL
enum reloc_type
{
R_ARC_NONE = 0,
R_ARC_ADDR32,
R_ARC_B22_PCREL,
R_ARC_max
};
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 */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
/* A standard 32 bit relocation. */
HOWTO (R_ARC_ADDR32, /* 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_ADDR32", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* A relative 22 bit branch; the lower two bits must be zero. */
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 */
bfd_elf_generic_reloc, /* special_function */
"R_ARC_B22_PCREL", /* name */
false, /* partial_inplace */
0, /* src_mask */
0x07ffff80, /* dst_mask */
true), /* pcrel_offset */
};
/* Don't pretend we can deal with unsupported relocs. */
static bfd_reloc_status_type
arc_elf_unsupported_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;
{
abort ();
}
/* Map BFD reloc types to ARC ELF reloc types. */
struct arc_reloc_map
{
unsigned char 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_ADDR32 },
{ BFD_RELOC_CTOR, R_ARC_ADDR32 },
{ BFD_RELOC_ARC_B22_PCREL, R_ARC_B22_PCREL },
};
static reloc_howto_type *
bfd_elf32_bfd_reloc_type_lookup (abfd, code)
bfd *abfd;
bfd_reloc_code_real_type code;
{
int i;
for (i = 0;
i < sizeof (arc_reloc_map) / sizeof (struct 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;
}
/* Set the howto pointer for an ARC ELF reloc. */
static void
arc_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_ARC_max);
cache_ptr->howto = &elf_arc_howto_table[r_type];
}
/* Set the right machine number for an ARC ELF file. */
static boolean
arc_elf_object_p (abfd)
bfd *abfd;
{
int mach;
unsigned long arch = elf_elfheader (abfd)->e_flags & EF_ARC_MACH;
switch (arch)
{
case E_ARC_MACH_BASE:
mach = bfd_mach_arc_base;
break;
case E_ARC_MACH_HOST:
mach = bfd_mach_arc_host;
break;
case E_ARC_MACH_GRAPHICS:
mach = bfd_mach_arc_graphics;
break;
case E_ARC_MACH_AUDIO:
mach = bfd_mach_arc_audio;
break;
default:
/* Unknown cpu type. ??? What to do? */
return false;
}
(void) bfd_default_set_arch_mach (abfd, bfd_arch_arc, mach);
return true;
}
/* 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 (abfd, linker)
bfd *abfd;
boolean linker;
{
int mach;
unsigned long val;
switch (mach = bfd_get_mach (abfd))
{
case bfd_mach_arc_base:
val = E_ARC_MACH_BASE;
break;
case bfd_mach_arc_host:
val = E_ARC_MACH_HOST;
break;
case bfd_mach_arc_graphics:
val = E_ARC_MACH_GRAPHICS;
break;
case bfd_mach_arc_audio:
val = E_ARC_MACH_AUDIO;
break;
default:
return;
}
elf_elfheader (abfd)->e_flags &=~ EF_ARC_MACH;
elf_elfheader (abfd)->e_flags |= val;
}
#define TARGET_LITTLE_SYM bfd_elf32_arc_vec
#define TARGET_LITTLE_NAME "elf32-arc"
#define ELF_ARCH bfd_arch_arc
#define ELF_MACHINE_CODE EM_CYGNUS_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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