| 1 | /* ARC-specific support for 32-bit ELF |
| 2 | Copyright 1994, 1995, 1997, 1999, 2001, 2002, 2005, 2007 |
| 3 | Free Software Foundation, Inc. |
| 4 | Contributed by Doug Evans (dje@cygnus.com). |
| 5 | |
| 6 | This file is part of BFD, the Binary File Descriptor library. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 2 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 21 | MA 02110-1301, USA. */ |
| 22 | |
| 23 | #include "sysdep.h" |
| 24 | #include "bfd.h" |
| 25 | #include "libbfd.h" |
| 26 | #include "elf-bfd.h" |
| 27 | #include "elf/arc.h" |
| 28 | #include "libiberty.h" |
| 29 | |
| 30 | /* Try to minimize the amount of space occupied by relocation tables |
| 31 | on the ROM (not that the ROM won't be swamped by other ELF overhead). */ |
| 32 | |
| 33 | #define USE_REL 1 |
| 34 | |
| 35 | static bfd_reloc_status_type |
| 36 | arc_elf_b22_pcrel (bfd * abfd, |
| 37 | arelent * reloc_entry, |
| 38 | asymbol * symbol, |
| 39 | void * data, |
| 40 | asection * input_section, |
| 41 | bfd * output_bfd, |
| 42 | char ** error_message) |
| 43 | { |
| 44 | /* If linking, back up the final symbol address by the address of the |
| 45 | reloc. This cannot be accomplished by setting the pcrel_offset |
| 46 | field to TRUE, as bfd_install_relocation will detect this and refuse |
| 47 | to install the offset in the first place, but bfd_perform_relocation |
| 48 | will still insist on removing it. */ |
| 49 | if (output_bfd == NULL) |
| 50 | reloc_entry->addend -= reloc_entry->address; |
| 51 | |
| 52 | /* Fall through to the default elf reloc handler. */ |
| 53 | return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, |
| 54 | input_section, output_bfd, error_message); |
| 55 | } |
| 56 | |
| 57 | static reloc_howto_type elf_arc_howto_table[] = |
| 58 | { |
| 59 | /* This reloc does nothing. */ |
| 60 | HOWTO (R_ARC_NONE, /* Type. */ |
| 61 | 0, /* Rightshift. */ |
| 62 | 2, /* Size (0 = byte, 1 = short, 2 = long). */ |
| 63 | 32, /* Bitsize. */ |
| 64 | FALSE, /* PC_relative. */ |
| 65 | 0, /* Bitpos. */ |
| 66 | complain_overflow_bitfield, /* Complain_on_overflow. */ |
| 67 | bfd_elf_generic_reloc, /* Special_function. */ |
| 68 | "R_ARC_NONE", /* Name. */ |
| 69 | TRUE, /* Partial_inplace. */ |
| 70 | 0, /* Src_mask. */ |
| 71 | 0, /* Dst_mask. */ |
| 72 | FALSE), /* PCrel_offset. */ |
| 73 | |
| 74 | /* A standard 32 bit relocation. */ |
| 75 | HOWTO (R_ARC_32, /* Type. */ |
| 76 | 0, /* Rightshift. */ |
| 77 | 2, /* Size (0 = byte, 1 = short, 2 = long). */ |
| 78 | 32, /* Bitsize. */ |
| 79 | FALSE, /* PC_relative. */ |
| 80 | 0, /* Bitpos. */ |
| 81 | complain_overflow_bitfield, /* Complain_on_overflow. */ |
| 82 | bfd_elf_generic_reloc, /* Special_function. */ |
| 83 | "R_ARC_32", /* Name. */ |
| 84 | TRUE, /* Partial_inplace. */ |
| 85 | 0xffffffff, /* Src_mask. */ |
| 86 | 0xffffffff, /* Dst_mask. */ |
| 87 | FALSE), /* PCrel_offset. */ |
| 88 | |
| 89 | /* A 26 bit absolute branch, right shifted by 2. */ |
| 90 | HOWTO (R_ARC_B26, /* Type. */ |
| 91 | 2, /* Rightshift. */ |
| 92 | 2, /* Size (0 = byte, 1 = short, 2 = long). */ |
| 93 | 26, /* Bitsize. */ |
| 94 | FALSE, /* PC_relative. */ |
| 95 | 0, /* Bitpos. */ |
| 96 | complain_overflow_bitfield, /* Complain_on_overflow. */ |
| 97 | bfd_elf_generic_reloc, /* Special_function. */ |
| 98 | "R_ARC_B26", /* Name. */ |
| 99 | TRUE, /* Partial_inplace. */ |
| 100 | 0x00ffffff, /* Src_mask. */ |
| 101 | 0x00ffffff, /* Dst_mask. */ |
| 102 | FALSE), /* PCrel_offset. */ |
| 103 | |
| 104 | /* A relative 22 bit branch; bits 21-2 are stored in bits 26-7. */ |
| 105 | HOWTO (R_ARC_B22_PCREL, /* Type. */ |
| 106 | 2, /* Rightshift. */ |
| 107 | 2, /* Size (0 = byte, 1 = short, 2 = long). */ |
| 108 | 22, /* Bitsize. */ |
| 109 | TRUE, /* PC_relative. */ |
| 110 | 7, /* Bitpos. */ |
| 111 | complain_overflow_signed, /* Complain_on_overflow. */ |
| 112 | arc_elf_b22_pcrel, /* Special_function. */ |
| 113 | "R_ARC_B22_PCREL", /* Name. */ |
| 114 | TRUE, /* Partial_inplace. */ |
| 115 | 0x07ffff80, /* Src_mask. */ |
| 116 | 0x07ffff80, /* Dst_mask. */ |
| 117 | FALSE), /* PCrel_offset. */ |
| 118 | }; |
| 119 | |
| 120 | /* Map BFD reloc types to ARC ELF reloc types. */ |
| 121 | |
| 122 | struct arc_reloc_map |
| 123 | { |
| 124 | bfd_reloc_code_real_type bfd_reloc_val; |
| 125 | unsigned char elf_reloc_val; |
| 126 | }; |
| 127 | |
| 128 | static const struct arc_reloc_map arc_reloc_map[] = |
| 129 | { |
| 130 | { BFD_RELOC_NONE, R_ARC_NONE, }, |
| 131 | { BFD_RELOC_32, R_ARC_32 }, |
| 132 | { BFD_RELOC_CTOR, R_ARC_32 }, |
| 133 | { BFD_RELOC_ARC_B26, R_ARC_B26 }, |
| 134 | { BFD_RELOC_ARC_B22_PCREL, R_ARC_B22_PCREL }, |
| 135 | }; |
| 136 | |
| 137 | static reloc_howto_type * |
| 138 | bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 139 | bfd_reloc_code_real_type code) |
| 140 | { |
| 141 | unsigned int i; |
| 142 | |
| 143 | for (i = ARRAY_SIZE (arc_reloc_map); i--;) |
| 144 | if (arc_reloc_map[i].bfd_reloc_val == code) |
| 145 | return elf_arc_howto_table + arc_reloc_map[i].elf_reloc_val; |
| 146 | |
| 147 | return NULL; |
| 148 | } |
| 149 | |
| 150 | static reloc_howto_type * |
| 151 | bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 152 | const char *r_name) |
| 153 | { |
| 154 | unsigned int i; |
| 155 | |
| 156 | for (i = 0; |
| 157 | i < sizeof (elf_arc_howto_table) / sizeof (elf_arc_howto_table[0]); |
| 158 | i++) |
| 159 | if (elf_arc_howto_table[i].name != NULL |
| 160 | && strcasecmp (elf_arc_howto_table[i].name, r_name) == 0) |
| 161 | return &elf_arc_howto_table[i]; |
| 162 | |
| 163 | return NULL; |
| 164 | } |
| 165 | |
| 166 | /* Set the howto pointer for an ARC ELF reloc. */ |
| 167 | |
| 168 | static void |
| 169 | arc_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED, |
| 170 | arelent *cache_ptr, |
| 171 | Elf_Internal_Rela *dst) |
| 172 | { |
| 173 | unsigned int r_type; |
| 174 | |
| 175 | r_type = ELF32_R_TYPE (dst->r_info); |
| 176 | BFD_ASSERT (r_type < (unsigned int) R_ARC_max); |
| 177 | cache_ptr->howto = &elf_arc_howto_table[r_type]; |
| 178 | } |
| 179 | |
| 180 | /* Set the right machine number for an ARC ELF file. */ |
| 181 | |
| 182 | static bfd_boolean |
| 183 | arc_elf_object_p (bfd *abfd) |
| 184 | { |
| 185 | unsigned int mach = bfd_mach_arc_6; |
| 186 | |
| 187 | if (elf_elfheader(abfd)->e_machine == EM_ARC) |
| 188 | { |
| 189 | unsigned long arch = elf_elfheader (abfd)->e_flags & EF_ARC_MACH; |
| 190 | |
| 191 | switch (arch) |
| 192 | { |
| 193 | case E_ARC_MACH_ARC5: |
| 194 | mach = bfd_mach_arc_5; |
| 195 | break; |
| 196 | default: |
| 197 | case E_ARC_MACH_ARC6: |
| 198 | mach = bfd_mach_arc_6; |
| 199 | break; |
| 200 | case E_ARC_MACH_ARC7: |
| 201 | mach = bfd_mach_arc_7; |
| 202 | break; |
| 203 | case E_ARC_MACH_ARC8: |
| 204 | mach = bfd_mach_arc_8; |
| 205 | break; |
| 206 | } |
| 207 | } |
| 208 | return bfd_default_set_arch_mach (abfd, bfd_arch_arc, mach); |
| 209 | } |
| 210 | |
| 211 | /* The final processing done just before writing out an ARC ELF object file. |
| 212 | This gets the ARC architecture right based on the machine number. */ |
| 213 | |
| 214 | static void |
| 215 | arc_elf_final_write_processing (bfd *abfd, |
| 216 | bfd_boolean linker ATTRIBUTE_UNUSED) |
| 217 | { |
| 218 | unsigned long val; |
| 219 | |
| 220 | switch (bfd_get_mach (abfd)) |
| 221 | { |
| 222 | case bfd_mach_arc_5: |
| 223 | val = E_ARC_MACH_ARC5; |
| 224 | break; |
| 225 | default: |
| 226 | case bfd_mach_arc_6: |
| 227 | val = E_ARC_MACH_ARC6; |
| 228 | break; |
| 229 | case bfd_mach_arc_7: |
| 230 | val = E_ARC_MACH_ARC7; |
| 231 | break; |
| 232 | case bfd_mach_arc_8: |
| 233 | val = E_ARC_MACH_ARC8; |
| 234 | break; |
| 235 | } |
| 236 | elf_elfheader (abfd)->e_flags &=~ EF_ARC_MACH; |
| 237 | elf_elfheader (abfd)->e_flags |= val; |
| 238 | } |
| 239 | |
| 240 | #define TARGET_LITTLE_SYM bfd_elf32_littlearc_vec |
| 241 | #define TARGET_LITTLE_NAME "elf32-littlearc" |
| 242 | #define TARGET_BIG_SYM bfd_elf32_bigarc_vec |
| 243 | #define TARGET_BIG_NAME "elf32-bigarc" |
| 244 | #define ELF_ARCH bfd_arch_arc |
| 245 | #define ELF_MACHINE_CODE EM_ARC |
| 246 | #define ELF_MAXPAGESIZE 0x1000 |
| 247 | |
| 248 | #define elf_info_to_howto 0 |
| 249 | #define elf_info_to_howto_rel arc_info_to_howto_rel |
| 250 | #define elf_backend_object_p arc_elf_object_p |
| 251 | #define elf_backend_final_write_processing arc_elf_final_write_processing |
| 252 | |
| 253 | #include "elf32-target.h" |