214 lines
6.0 KiB
C
214 lines
6.0 KiB
C
|
/* ARC-specific support for 32-bit ELF
|
||
|
|
Copyright (C) 1994, 1995, 1997 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
||
|
|
|
||
|
|
#include "bfd.h"
|
||
|
|
#include "sysdep.h"
|
||
|
|
#include "libbfd.h"
|
||
|
|
#include "elf-bfd.h"
|
||
|
|
#include "elf/arc.h"
|
||
|
|
|
||
|
|
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 (not that the ROM won't be swamped by other ELF overhead). */
|
||
|
|
#define USE_REL
|
||
|
|
|
||
|
|
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_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 */
|
||
|
|
false, /* 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 */
|
||
|
|
false, /* 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 */
|
||
|
|
bfd_elf_generic_reloc, /* special_function */
|
||
|
|
"R_ARC_B22_PCREL", /* name */
|
||
|
|
false, /* partial_inplace */
|
||
|
|
0x07ffff80, /* src_mask */
|
||
|
|
0x07ffff80, /* dst_mask */
|
||
|
|
true), /* pcrel_offset */
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
/* 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_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 (abfd, code)
|
||
|
|
bfd *abfd;
|
||
|
|
bfd_reloc_code_real_type code;
|
||
|
|
{
|
||
|
|
unsigned 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;
|
||
|
|
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;
|
||
|
|
default:
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
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_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"
|