| 1 | /* ARC-specific support for 32-bit ELF
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| 2 | Copyright 1994, 1995, 1997, 1999, 2001 Free Software Foundation, Inc.
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| 3 | Contributed by Doug Evans (dje@cygnus.com).
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| 4 |
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| 5 | This file is part of BFD, the Binary File Descriptor library.
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| 6 |
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| 7 | This program is free software; you can redistribute it and/or modify
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| 8 | it under the terms of the GNU General Public License as published by
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| 9 | the Free Software Foundation; either version 2 of the License, or
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| 10 | (at your option) any later version.
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| 11 |
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| 12 | This program is distributed in the hope that it will be useful,
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| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | GNU General Public License for more details.
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| 16 |
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| 17 | You should have received a copy of the GNU General Public License
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| 18 | along with this program; if not, write to the Free Software
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| 19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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| 20 |
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| 21 | #include "bfd.h"
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| 22 | #include "sysdep.h"
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| 23 | #include "libbfd.h"
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| 24 | #include "elf-bfd.h"
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| 25 | #include "elf/arc.h"
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| 26 |
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| 27 | static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
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| 28 | PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
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| 29 | static void arc_info_to_howto_rel
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| 30 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *));
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| 31 | static boolean arc_elf_object_p
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| 32 | PARAMS ((bfd *));
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| 33 | static void arc_elf_final_write_processing
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| 34 | PARAMS ((bfd *, boolean));
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| 35 |
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| 36 | /* Try to minimize the amount of space occupied by relocation tables
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| 37 | on the ROM (not that the ROM won't be swamped by other ELF overhead). */
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| 38 |
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| 39 | #define USE_REL
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| 40 |
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| 41 | static reloc_howto_type elf_arc_howto_table[] =
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| 42 | {
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| 43 | /* This reloc does nothing. */
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| 44 | HOWTO (R_ARC_NONE, /* type */
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| 45 | 0, /* rightshift */
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| 46 | 2, /* size (0 = byte, 1 = short, 2 = long) */
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| 47 | 32, /* bitsize */
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| 48 | false, /* pc_relative */
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| 49 | 0, /* bitpos */
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| 50 | complain_overflow_bitfield, /* complain_on_overflow */
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| 51 | bfd_elf_generic_reloc, /* special_function */
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| 52 | "R_ARC_NONE", /* name */
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| 53 | false, /* partial_inplace */
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| 54 | 0, /* src_mask */
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| 55 | 0, /* dst_mask */
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| 56 | false), /* pcrel_offset */
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| 57 |
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| 58 | /* A standard 32 bit relocation. */
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| 59 | HOWTO (R_ARC_32, /* type */
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| 60 | 0, /* rightshift */
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| 61 | 2, /* size (0 = byte, 1 = short, 2 = long) */
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| 62 | 32, /* bitsize */
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| 63 | false, /* pc_relative */
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| 64 | 0, /* bitpos */
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| 65 | complain_overflow_bitfield, /* complain_on_overflow */
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| 66 | bfd_elf_generic_reloc, /* special_function */
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| 67 | "R_ARC_32", /* name */
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| 68 | false, /* partial_inplace */
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| 69 | 0xffffffff, /* src_mask */
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| 70 | 0xffffffff, /* dst_mask */
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| 71 | false), /* pcrel_offset */
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| 72 |
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| 73 | /* A 26 bit absolute branch, right shifted by 2. */
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| 74 | HOWTO (R_ARC_B26, /* type */
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| 75 | 2, /* rightshift */
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| 76 | 2, /* size (0 = byte, 1 = short, 2 = long) */
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| 77 | 26, /* bitsize */
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| 78 | false, /* pc_relative */
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| 79 | 0, /* bitpos */
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| 80 | complain_overflow_bitfield, /* complain_on_overflow */
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| 81 | bfd_elf_generic_reloc, /* special_function */
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| 82 | "R_ARC_B26", /* name */
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| 83 | false, /* partial_inplace */
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| 84 | 0x00ffffff, /* src_mask */
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| 85 | 0x00ffffff, /* dst_mask */
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| 86 | false), /* pcrel_offset */
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| 87 |
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| 88 | /* A relative 22 bit branch; bits 21-2 are stored in bits 26-7. */
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| 89 | HOWTO (R_ARC_B22_PCREL, /* type */
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| 90 | 2, /* rightshift */
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| 91 | 2, /* size (0 = byte, 1 = short, 2 = long) */
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| 92 | 22, /* bitsize */
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| 93 | true, /* pc_relative */
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| 94 | 7, /* bitpos */
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| 95 | complain_overflow_signed, /* complain_on_overflow */
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| 96 | bfd_elf_generic_reloc, /* special_function */
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| 97 | "R_ARC_B22_PCREL", /* name */
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| 98 | false, /* partial_inplace */
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| 99 | 0x07ffff80, /* src_mask */
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| 100 | 0x07ffff80, /* dst_mask */
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| 101 | true), /* pcrel_offset */
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| 102 |
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| 103 | };
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| 104 |
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| 105 | /* Map BFD reloc types to ARC ELF reloc types. */
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| 106 |
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| 107 | struct arc_reloc_map
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| 108 | {
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| 109 | bfd_reloc_code_real_type bfd_reloc_val;
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| 110 | unsigned char elf_reloc_val;
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| 111 | };
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| 112 |
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| 113 | static const struct arc_reloc_map arc_reloc_map[] =
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| 114 | {
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| 115 | { BFD_RELOC_NONE, R_ARC_NONE, },
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| 116 | { BFD_RELOC_32, R_ARC_32 },
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| 117 | { BFD_RELOC_CTOR, R_ARC_32 },
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| 118 | { BFD_RELOC_ARC_B26, R_ARC_B26 },
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| 119 | { BFD_RELOC_ARC_B22_PCREL, R_ARC_B22_PCREL },
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| 120 | };
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| 121 |
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| 122 | static reloc_howto_type *
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| 123 | bfd_elf32_bfd_reloc_type_lookup (abfd, code)
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| 124 | bfd *abfd ATTRIBUTE_UNUSED;
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| 125 | bfd_reloc_code_real_type code;
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| 126 | {
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| 127 | unsigned int i;
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| 128 |
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| 129 | for (i = 0; i < sizeof (arc_reloc_map) / sizeof (struct arc_reloc_map); i++)
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| 130 | {
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| 131 | if (arc_reloc_map[i].bfd_reloc_val == code)
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| 132 | return &elf_arc_howto_table[arc_reloc_map[i].elf_reloc_val];
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| 133 | }
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| 134 | return NULL;
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| 135 | }
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| 136 |
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| 137 | /* Set the howto pointer for an ARC ELF reloc. */
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| 138 |
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| 139 | static void
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| 140 | arc_info_to_howto_rel (abfd, cache_ptr, dst)
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| 141 | bfd *abfd ATTRIBUTE_UNUSED;
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| 142 | arelent *cache_ptr;
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| 143 | Elf32_Internal_Rel *dst;
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| 144 | {
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| 145 | unsigned int r_type;
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| 146 |
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| 147 | r_type = ELF32_R_TYPE (dst->r_info);
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| 148 | BFD_ASSERT (r_type < (unsigned int) R_ARC_max);
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| 149 | cache_ptr->howto = &elf_arc_howto_table[r_type];
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| 150 | }
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| 151 |
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| 152 | /* Set the right machine number for an ARC ELF file. */
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| 153 |
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| 154 | static boolean
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| 155 | arc_elf_object_p (abfd)
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| 156 | bfd *abfd;
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| 157 | {
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| 158 | int mach = bfd_mach_arc_6;
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| 159 |
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| 160 | if (elf_elfheader(abfd)->e_machine == EM_ARC)
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| 161 | {
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| 162 | unsigned long arch = elf_elfheader (abfd)->e_flags & EF_ARC_MACH;
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| 163 |
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| 164 | switch (arch)
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| 165 | {
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| 166 | case E_ARC_MACH_ARC5:
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| 167 | mach = bfd_mach_arc_5;
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| 168 | break;
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| 169 | default:
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| 170 | case E_ARC_MACH_ARC6:
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| 171 | mach = bfd_mach_arc_6;
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| 172 | break;
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| 173 | case E_ARC_MACH_ARC7:
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| 174 | mach = bfd_mach_arc_7;
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| 175 | break;
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| 176 | case E_ARC_MACH_ARC8:
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| 177 | mach = bfd_mach_arc_8;
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| 178 | break;
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| 179 | }
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| 180 | }
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| 181 | return bfd_default_set_arch_mach (abfd, bfd_arch_arc, mach);
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| 182 | }
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| 183 |
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| 184 | /* The final processing done just before writing out an ARC ELF object file.
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| 185 | This gets the ARC architecture right based on the machine number. */
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| 186 |
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| 187 | static void
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| 188 | arc_elf_final_write_processing (abfd, linker)
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| 189 | bfd *abfd;
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| 190 | boolean linker ATTRIBUTE_UNUSED;
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| 191 | {
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| 192 | unsigned long val;
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| 193 |
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| 194 | switch (bfd_get_mach (abfd))
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| 195 | {
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| 196 | case bfd_mach_arc_5:
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| 197 | val = E_ARC_MACH_ARC5;
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| 198 | break;
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| 199 | default:
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| 200 | case bfd_mach_arc_6:
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| 201 | val = E_ARC_MACH_ARC6;
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| 202 | break;
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| 203 | case bfd_mach_arc_7:
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| 204 | val = E_ARC_MACH_ARC7;
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| 205 | break;
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| 206 | case bfd_mach_arc_8:
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| 207 | val = E_ARC_MACH_ARC8;
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| 208 | break;
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| 209 | }
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| 210 | elf_elfheader (abfd)->e_machine = EM_ARC;
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| 211 | elf_elfheader (abfd)->e_flags &=~ EF_ARC_MACH;
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| 212 | elf_elfheader (abfd)->e_flags |= val;
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| 213 | }
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| 214 |
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| 215 | #define TARGET_LITTLE_SYM bfd_elf32_littlearc_vec
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| 216 | #define TARGET_LITTLE_NAME "elf32-littlearc"
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| 217 | #define TARGET_BIG_SYM bfd_elf32_bigarc_vec
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| 218 | #define TARGET_BIG_NAME "elf32-bigarc"
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| 219 | #define ELF_ARCH bfd_arch_arc
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| 220 | #define ELF_MACHINE_CODE EM_ARC
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| 221 | #define ELF_MAXPAGESIZE 0x1000
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| 222 |
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| 223 | #define elf_info_to_howto 0
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| 224 | #define elf_info_to_howto_rel arc_info_to_howto_rel
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| 225 | #define elf_backend_object_p arc_elf_object_p
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| 226 | #define elf_backend_final_write_processing arc_elf_final_write_processing
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| 227 |
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| 228 | #include "elf32-target.h"
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