214 lines
6.0 KiB
C
214 lines
6.0 KiB
C
/* ARC-specific support for 32-bit ELF
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Copyright (C) 1994, 1995, 1997 Free Software Foundation, Inc.
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Contributed by Doug Evans (dje@cygnus.com).
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "bfd.h"
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#include "sysdep.h"
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#include "libbfd.h"
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#include "elf-bfd.h"
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#include "elf/arc.h"
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static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
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PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
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static void arc_info_to_howto_rel
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PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *));
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static boolean arc_elf_object_p PARAMS ((bfd *));
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static void arc_elf_final_write_processing PARAMS ((bfd *, boolean));
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/* Try to minimize the amount of space occupied by relocation tables
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on the ROM (not that the ROM won't be swamped by other ELF overhead). */
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#define USE_REL
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static reloc_howto_type elf_arc_howto_table[] =
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{
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/* This reloc does nothing. */
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HOWTO (R_ARC_NONE, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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32, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_ARC_NONE", /* name */
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false, /* partial_inplace */
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0, /* src_mask */
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0, /* dst_mask */
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false), /* pcrel_offset */
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/* A standard 32 bit relocation. */
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HOWTO (R_ARC_32, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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32, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_ARC_32", /* name */
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false, /* partial_inplace */
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0xffffffff, /* src_mask */
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0xffffffff, /* dst_mask */
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false), /* pcrel_offset */
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/* A 26 bit absolute branch, right shifted by 2. */
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HOWTO (R_ARC_B26, /* type */
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2, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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26, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_ARC_B26", /* name */
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false, /* partial_inplace */
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0x00ffffff, /* src_mask */
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0x00ffffff, /* dst_mask */
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false), /* pcrel_offset */
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/* A relative 22 bit branch; bits 21-2 are stored in bits 26-7. */
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HOWTO (R_ARC_B22_PCREL, /* type */
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2, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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22, /* bitsize */
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true, /* pc_relative */
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7, /* bitpos */
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complain_overflow_signed, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_ARC_B22_PCREL", /* name */
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false, /* partial_inplace */
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0x07ffff80, /* src_mask */
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0x07ffff80, /* dst_mask */
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true), /* pcrel_offset */
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};
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/* Map BFD reloc types to ARC ELF reloc types. */
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struct arc_reloc_map
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{
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unsigned char bfd_reloc_val;
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unsigned char elf_reloc_val;
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};
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static const struct arc_reloc_map arc_reloc_map[] =
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{
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{ BFD_RELOC_NONE, R_ARC_NONE, },
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{ BFD_RELOC_32, R_ARC_32 },
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{ BFD_RELOC_CTOR, R_ARC_32 },
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{ BFD_RELOC_ARC_B26, R_ARC_B26 },
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{ BFD_RELOC_ARC_B22_PCREL, R_ARC_B22_PCREL },
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};
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static reloc_howto_type *
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bfd_elf32_bfd_reloc_type_lookup (abfd, code)
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bfd *abfd;
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bfd_reloc_code_real_type code;
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{
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unsigned int i;
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for (i = 0;
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i < sizeof (arc_reloc_map) / sizeof (struct arc_reloc_map);
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i++)
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{
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if (arc_reloc_map[i].bfd_reloc_val == code)
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return &elf_arc_howto_table[arc_reloc_map[i].elf_reloc_val];
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}
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return NULL;
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}
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/* Set the howto pointer for an ARC ELF reloc. */
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static void
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arc_info_to_howto_rel (abfd, cache_ptr, dst)
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bfd *abfd;
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arelent *cache_ptr;
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Elf32_Internal_Rel *dst;
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{
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unsigned int r_type;
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r_type = ELF32_R_TYPE (dst->r_info);
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BFD_ASSERT (r_type < (unsigned int) R_ARC_max);
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cache_ptr->howto = &elf_arc_howto_table[r_type];
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}
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/* Set the right machine number for an ARC ELF file. */
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static boolean
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arc_elf_object_p (abfd)
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bfd *abfd;
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{
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int mach;
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unsigned long arch = elf_elfheader (abfd)->e_flags & EF_ARC_MACH;
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switch (arch)
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{
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case E_ARC_MACH_BASE:
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mach = bfd_mach_arc_base;
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break;
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default:
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/* Unknown cpu type. ??? What to do? */
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return false;
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}
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(void) bfd_default_set_arch_mach (abfd, bfd_arch_arc, mach);
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return true;
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}
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/* The final processing done just before writing out an ARC ELF object file.
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This gets the ARC architecture right based on the machine number. */
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static void
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arc_elf_final_write_processing (abfd, linker)
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bfd *abfd;
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boolean linker;
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{
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int mach;
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unsigned long val;
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switch (mach = bfd_get_mach (abfd))
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{
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case bfd_mach_arc_base:
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val = E_ARC_MACH_BASE;
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break;
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default:
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return;
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}
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elf_elfheader (abfd)->e_flags &=~ EF_ARC_MACH;
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elf_elfheader (abfd)->e_flags |= val;
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}
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#define TARGET_LITTLE_SYM bfd_elf32_littlearc_vec
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#define TARGET_LITTLE_NAME "elf32-littlearc"
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#define TARGET_BIG_SYM bfd_elf32_bigarc_vec
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#define TARGET_BIG_NAME "elf32-bigarc"
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#define ELF_ARCH bfd_arch_arc
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#define ELF_MACHINE_CODE EM_CYGNUS_ARC
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#define ELF_MAXPAGESIZE 0x1000
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#define elf_info_to_howto 0
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#define elf_info_to_howto_rel arc_info_to_howto_rel
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#define elf_backend_object_p arc_elf_object_p
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#define elf_backend_final_write_processing \
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arc_elf_final_write_processing
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#include "elf32-target.h"
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