462 lines
11 KiB
C
462 lines
11 KiB
C
/* Matsushita 10300 specific support for 32-bit ELF
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Copyright (C) 1996, 1997 Free Software Foundation, Inc.
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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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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 mn10300_info_to_howto
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PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
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static bfd_reloc_status_type bfd_elf32_mn10300_reloc
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PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
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/* We have to use RELA instructions since md_apply_fix3 in the assembler
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does absolutely nothing. */
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#define USE_RELA
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enum reloc_type
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{
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R_MN10300_NONE = 0,
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R_MN10300_32,
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R_MN10300_16,
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R_MN10300_8,
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R_MN10300_PCREL32,
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R_MN10300_PCREL16,
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R_MN10300_PCREL8,
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R_MN10300_MAX
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};
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static reloc_howto_type elf_mn10300_howto_table[] =
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{
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/* Dummy relocation. Does nothing. */
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HOWTO (R_MN10300_NONE,
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0,
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2,
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16,
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false,
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0,
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complain_overflow_bitfield,
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bfd_elf_generic_reloc,
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"R_MN10300_NONE",
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false,
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0,
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0,
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false),
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/* Standard 32 bit reloc. */
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HOWTO (R_MN10300_32,
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0,
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2,
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32,
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false,
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0,
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complain_overflow_bitfield,
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bfd_elf_generic_reloc,
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"R_MN10300_32",
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false,
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0xffffffff,
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0xffffffff,
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false),
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/* Standard 16 bit reloc. */
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HOWTO (R_MN10300_16,
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0,
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1,
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16,
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false,
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0,
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complain_overflow_bitfield,
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bfd_elf_generic_reloc,
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"R_MN10300_16",
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false,
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0xffff,
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0xffff,
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false),
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/* Standard 8 bit reloc. */
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HOWTO (R_MN10300_8,
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0,
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0,
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8,
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false,
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0,
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complain_overflow_bitfield,
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bfd_elf_generic_reloc,
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"R_MN10300_8",
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false,
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0xff,
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0xff,
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false),
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/* Standard 32bit pc-relative reloc. */
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HOWTO (R_MN10300_PCREL32,
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0,
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2,
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32,
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true,
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0,
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complain_overflow_bitfield,
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bfd_elf_generic_reloc,
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"R_MN10300_PCREL32",
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false,
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0xffffffff,
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0xffffffff,
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true),
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/* Standard 16bit pc-relative reloc. */
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HOWTO (R_MN10300_PCREL16,
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0,
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1,
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16,
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true,
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0,
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complain_overflow_bitfield,
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bfd_elf_generic_reloc,
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"R_MN10300_PCREL16",
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false,
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0xffff,
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0xffff,
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true),
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/* Standard 8 pc-relative reloc. */
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HOWTO (R_MN10300_PCREL8,
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0,
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0,
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8,
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true,
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0,
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complain_overflow_bitfield,
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bfd_elf_generic_reloc,
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"R_MN10300_PCREL8",
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false,
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0xff,
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0xff,
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true),
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};
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struct mn10300_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 mn10300_reloc_map mn10300_reloc_map[] =
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{
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{ BFD_RELOC_NONE, R_MN10300_NONE, },
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{ BFD_RELOC_32, R_MN10300_32, },
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{ BFD_RELOC_16, R_MN10300_16, },
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{ BFD_RELOC_8, R_MN10300_8, },
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{ BFD_RELOC_32_PCREL, R_MN10300_PCREL32, },
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{ BFD_RELOC_16_PCREL, R_MN10300_PCREL16, },
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{ BFD_RELOC_8_PCREL, R_MN10300_PCREL8, },
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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 (mn10300_reloc_map) / sizeof (struct mn10300_reloc_map);
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i++)
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{
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if (mn10300_reloc_map[i].bfd_reloc_val == code)
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return &elf_mn10300_howto_table[mn10300_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 MN10300 ELF reloc. */
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static void
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mn10300_info_to_howto (abfd, cache_ptr, dst)
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bfd *abfd;
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arelent *cache_ptr;
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Elf32_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_MN10300_MAX);
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cache_ptr->howto = &elf_mn10300_howto_table[r_type];
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}
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/* Perform a relocation as part of a final link. */
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static bfd_reloc_status_type
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mn10300_elf_final_link_relocate (howto, input_bfd, output_bfd,
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input_section, contents, offset, value,
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addend, info, sym_sec, is_local)
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reloc_howto_type *howto;
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bfd *input_bfd;
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bfd *output_bfd;
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asection *input_section;
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bfd_byte *contents;
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bfd_vma offset;
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bfd_vma value;
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bfd_vma addend;
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struct bfd_link_info *info;
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asection *sym_sec;
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int is_local;
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{
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unsigned long r_type = howto->type;
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bfd_byte *hit_data = contents + offset;
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switch (r_type)
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{
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case R_MN10300_NONE:
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return bfd_reloc_ok;
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case R_MN10300_32:
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value += addend;
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bfd_put_32 (input_bfd, value, hit_data);
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return bfd_reloc_ok;
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case R_MN10300_16:
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value += addend;
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if ((long)value > 0x7fff || (long)value < -0x8000)
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return bfd_reloc_overflow;
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bfd_put_16 (input_bfd, value, hit_data);
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return bfd_reloc_ok;
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case R_MN10300_8:
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value += addend;
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if ((long)value > 0x7fff || (long)value < -0x8000)
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return bfd_reloc_overflow;
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bfd_put_8 (input_bfd, value, hit_data);
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return bfd_reloc_ok;
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case R_MN10300_PCREL8:
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value -= (input_section->output_section->vma
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+ input_section->output_offset);
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value -= offset;
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value += addend;
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if ((long)value > 0xff || (long)value < -0x100)
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return bfd_reloc_overflow;
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bfd_put_8 (input_bfd, value, hit_data);
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return bfd_reloc_ok;
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case R_MN10300_PCREL16:
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value -= (input_section->output_section->vma
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+ input_section->output_offset);
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value -= offset;
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value += addend;
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if ((long)value > 0xffff || (long)value < -0x10000)
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return bfd_reloc_overflow;
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bfd_put_16 (input_bfd, value, hit_data);
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return bfd_reloc_ok;
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case R_MN10300_PCREL32:
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value -= (input_section->output_section->vma
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+ input_section->output_offset);
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value -= offset;
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value += addend;
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bfd_put_32 (input_bfd, value, hit_data);
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return bfd_reloc_ok;
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default:
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return bfd_reloc_notsupported;
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}
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}
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/* Relocate an MN10300 ELF section. */
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static boolean
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mn10300_elf_relocate_section (output_bfd, info, input_bfd, input_section,
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contents, relocs, local_syms, local_sections)
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bfd *output_bfd;
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struct bfd_link_info *info;
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bfd *input_bfd;
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asection *input_section;
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bfd_byte *contents;
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Elf_Internal_Rela *relocs;
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Elf_Internal_Sym *local_syms;
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asection **local_sections;
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{
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Elf_Internal_Shdr *symtab_hdr;
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struct elf_link_hash_entry **sym_hashes;
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Elf_Internal_Rela *rel, *relend;
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symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
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sym_hashes = elf_sym_hashes (input_bfd);
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rel = relocs;
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relend = relocs + input_section->reloc_count;
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for (; rel < relend; rel++)
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{
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int r_type;
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reloc_howto_type *howto;
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unsigned long r_symndx;
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Elf_Internal_Sym *sym;
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asection *sec;
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struct elf_link_hash_entry *h;
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bfd_vma relocation;
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bfd_reloc_status_type r;
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r_symndx = ELF32_R_SYM (rel->r_info);
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r_type = ELF32_R_TYPE (rel->r_info);
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howto = elf_mn10300_howto_table + r_type;
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if (info->relocateable)
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{
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/* This is a relocateable link. We don't have to change
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anything, unless the reloc is against a section symbol,
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in which case we have to adjust according to where the
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section symbol winds up in the output section. */
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if (r_symndx < symtab_hdr->sh_info)
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{
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sym = local_syms + r_symndx;
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if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
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{
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sec = local_sections[r_symndx];
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rel->r_addend += sec->output_offset + sym->st_value;
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}
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}
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continue;
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}
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/* This is a final link. */
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h = NULL;
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sym = NULL;
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sec = NULL;
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if (r_symndx < symtab_hdr->sh_info)
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{
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sym = local_syms + r_symndx;
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sec = local_sections[r_symndx];
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relocation = (sec->output_section->vma
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+ sec->output_offset
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+ sym->st_value);
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}
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else
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{
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h = sym_hashes[r_symndx - symtab_hdr->sh_info];
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while (h->root.type == bfd_link_hash_indirect
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|| h->root.type == bfd_link_hash_warning)
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h = (struct elf_link_hash_entry *) h->root.u.i.link;
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if (h->root.type == bfd_link_hash_defined
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|| h->root.type == bfd_link_hash_defweak)
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{
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sec = h->root.u.def.section;
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relocation = (h->root.u.def.value
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+ sec->output_section->vma
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+ sec->output_offset);
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}
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else if (h->root.type == bfd_link_hash_undefweak)
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relocation = 0;
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else
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{
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if (! ((*info->callbacks->undefined_symbol)
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(info, h->root.root.string, input_bfd,
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input_section, rel->r_offset)))
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return false;
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relocation = 0;
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}
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}
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r = mn10300_elf_final_link_relocate (howto, input_bfd, output_bfd,
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input_section,
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contents, rel->r_offset,
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relocation, rel->r_addend,
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info, sec, h == NULL);
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if (r != bfd_reloc_ok)
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{
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const char *name;
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const char *msg = (const char *)0;
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if (h != NULL)
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name = h->root.root.string;
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else
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{
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name = (bfd_elf_string_from_elf_section
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(input_bfd, symtab_hdr->sh_link, sym->st_name));
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if (name == NULL || *name == '\0')
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name = bfd_section_name (input_bfd, sec);
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}
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switch (r)
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{
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case bfd_reloc_overflow:
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if (! ((*info->callbacks->reloc_overflow)
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(info, name, howto->name, (bfd_vma) 0,
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input_bfd, input_section, rel->r_offset)))
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return false;
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break;
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case bfd_reloc_undefined:
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if (! ((*info->callbacks->undefined_symbol)
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(info, name, input_bfd, input_section,
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rel->r_offset)))
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return false;
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break;
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case bfd_reloc_outofrange:
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msg = "internal error: out of range error";
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goto common_error;
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case bfd_reloc_notsupported:
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msg = "internal error: unsupported relocation error";
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goto common_error;
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case bfd_reloc_dangerous:
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msg = "internal error: dangerous error";
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goto common_error;
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default:
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msg = "internal error: unknown error";
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/* fall through */
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common_error:
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if (!((*info->callbacks->warning)
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(info, msg, name, input_bfd, input_section,
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rel->r_offset)))
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return false;
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break;
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}
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}
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}
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return true;
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}
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#define TARGET_LITTLE_SYM bfd_elf32_mn10300_vec
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#define TARGET_LITTLE_NAME "elf32-mn10300"
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#define ELF_ARCH bfd_arch_mn10300
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#define ELF_MACHINE_CODE EM_CYGNUS_MN10300
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#define ELF_MAXPAGESIZE 0x1000
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#define elf_info_to_howto mn10300_info_to_howto
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#define elf_info_to_howto_rel 0
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#define elf_backend_relocate_section mn10300_elf_relocate_section
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#define elf_symbol_leading_char '_'
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#include "elf32-target.h"
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