254 lines
7.3 KiB
C
254 lines
7.3 KiB
C
/* ARC-specific support for 32-bit ELF
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Copyright 1994, 1995, 1997, 1999, 2001, 2002, 2005, 2007
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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., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "sysdep.h"
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#include "bfd.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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#include "libiberty.h"
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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 1
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static bfd_reloc_status_type
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arc_elf_b22_pcrel (bfd * abfd,
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arelent * reloc_entry,
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asymbol * symbol,
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void * data,
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asection * input_section,
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bfd * output_bfd,
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char ** error_message)
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{
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/* If linking, back up the final symbol address by the address of the
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reloc. This cannot be accomplished by setting the pcrel_offset
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field to TRUE, as bfd_install_relocation will detect this and refuse
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to install the offset in the first place, but bfd_perform_relocation
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will still insist on removing it. */
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if (output_bfd == NULL)
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reloc_entry->addend -= reloc_entry->address;
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/* Fall through to the default elf reloc handler. */
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return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
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input_section, output_bfd, error_message);
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}
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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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TRUE, /* 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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TRUE, /* 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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TRUE, /* 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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arc_elf_b22_pcrel, /* Special_function. */
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"R_ARC_B22_PCREL", /* Name. */
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TRUE, /* Partial_inplace. */
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0x07ffff80, /* Src_mask. */
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0x07ffff80, /* Dst_mask. */
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FALSE), /* 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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bfd_reloc_code_real_type 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 (bfd *abfd ATTRIBUTE_UNUSED,
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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 = ARRAY_SIZE (arc_reloc_map); i--;)
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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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return NULL;
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}
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static reloc_howto_type *
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bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
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const char *r_name)
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{
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unsigned int i;
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for (i = 0;
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i < sizeof (elf_arc_howto_table) / sizeof (elf_arc_howto_table[0]);
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i++)
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if (elf_arc_howto_table[i].name != NULL
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&& strcasecmp (elf_arc_howto_table[i].name, r_name) == 0)
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return &elf_arc_howto_table[i];
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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 (bfd *abfd ATTRIBUTE_UNUSED,
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arelent *cache_ptr,
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Elf_Internal_Rela *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 bfd_boolean
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arc_elf_object_p (bfd *abfd)
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{
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unsigned int mach = bfd_mach_arc_6;
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if (elf_elfheader(abfd)->e_machine == EM_ARC)
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{
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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_ARC5:
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mach = bfd_mach_arc_5;
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break;
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default:
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case E_ARC_MACH_ARC6:
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mach = bfd_mach_arc_6;
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break;
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case E_ARC_MACH_ARC7:
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mach = bfd_mach_arc_7;
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break;
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case E_ARC_MACH_ARC8:
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mach = bfd_mach_arc_8;
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break;
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}
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}
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return bfd_default_set_arch_mach (abfd, bfd_arch_arc, mach);
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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 (bfd *abfd,
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bfd_boolean linker ATTRIBUTE_UNUSED)
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{
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unsigned long val;
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switch (bfd_get_mach (abfd))
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{
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case bfd_mach_arc_5:
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val = E_ARC_MACH_ARC5;
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break;
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default:
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case bfd_mach_arc_6:
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val = E_ARC_MACH_ARC6;
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break;
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case bfd_mach_arc_7:
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val = E_ARC_MACH_ARC7;
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break;
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case bfd_mach_arc_8:
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val = E_ARC_MACH_ARC8;
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break;
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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_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 arc_elf_final_write_processing
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#include "elf32-target.h"
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