| 1 | /* D30V-specific support for 32-bit ELF |
| 2 | Copyright (C) 1997 Free Software Foundation, Inc. |
| 3 | Contributed by Martin Hunt (hunt@cygnus.com). |
| 4 | |
| 5 | This file is part of BFD, the Binary File Descriptor library. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 20 | |
| 21 | #include "bfd.h" |
| 22 | #include "sysdep.h" |
| 23 | #include "libbfd.h" |
| 24 | #include "elf-bfd.h" |
| 25 | |
| 26 | static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup |
| 27 | PARAMS ((bfd *abfd, bfd_reloc_code_real_type code)); |
| 28 | static void d30v_info_to_howto_rel |
| 29 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *)); |
| 30 | static bfd_reloc_status_type bfd_elf_d30v_reloc PARAMS (( |
| 31 | bfd *abfd, |
| 32 | arelent *reloc_entry, |
| 33 | asymbol *symbol, |
| 34 | PTR data, |
| 35 | asection *input_section, |
| 36 | bfd *output_bfd, |
| 37 | char **error_message)); |
| 38 | |
| 39 | /* Use REL instead of RELA to save space */ |
| 40 | #define USE_REL |
| 41 | |
| 42 | enum reloc_type |
| 43 | { |
| 44 | R_D30V_NONE = 0, |
| 45 | R_D30V_6, |
| 46 | R_D30V_15, |
| 47 | R_D30V_15_PCREL, |
| 48 | R_D30V_21, |
| 49 | R_D30V_21_PCREL, |
| 50 | R_D30V_32, |
| 51 | R_D30V_32_PCREL, |
| 52 | R_D30V_32_NORMAL, |
| 53 | R_D30V_max |
| 54 | }; |
| 55 | |
| 56 | static reloc_howto_type elf_d30v_howto_table[] = |
| 57 | { |
| 58 | /* This reloc does nothing. */ |
| 59 | HOWTO (R_D30V_NONE, /* type */ |
| 60 | 0, /* rightshift */ |
| 61 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 62 | 32, /* bitsize */ |
| 63 | false, /* pc_relative */ |
| 64 | 0, /* bitpos */ |
| 65 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 66 | bfd_elf_generic_reloc, /* special_function */ |
| 67 | "R_D30V_NONE", /* name */ |
| 68 | false, /* partial_inplace */ |
| 69 | 0, /* src_mask */ |
| 70 | 0, /* dst_mask */ |
| 71 | false), /* pcrel_offset */ |
| 72 | |
| 73 | /* A 6 bit absolute relocation */ |
| 74 | HOWTO (R_D30V_6, /* type */ |
| 75 | 0, /* rightshift */ |
| 76 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 77 | 6, /* bitsize */ |
| 78 | false, /* pc_relative */ |
| 79 | 0, /* bitpos */ |
| 80 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 81 | bfd_elf_generic_reloc, /* special_function */ |
| 82 | "R_D30V_6", /* name */ |
| 83 | false, /* partial_inplace */ |
| 84 | 0x3f, /* src_mask */ |
| 85 | 0x3f, /* dst_mask */ |
| 86 | false), /* pcrel_offset */ |
| 87 | |
| 88 | /* An absolute 15 bit relocation, right shifted by 3 */ |
| 89 | HOWTO (R_D30V_15, /* type */ |
| 90 | 3, /* rightshift */ |
| 91 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 92 | 15, /* bitsize */ |
| 93 | false, /* pc_relative */ |
| 94 | 0, /* bitpos */ |
| 95 | complain_overflow_signed, /* complain_on_overflow */ |
| 96 | bfd_elf_generic_reloc, /* special_function */ |
| 97 | "R_D30V_15", /* name */ |
| 98 | false, /* partial_inplace */ |
| 99 | 0xfff, /* src_mask */ |
| 100 | 0xfff, /* dst_mask */ |
| 101 | false), /* pcrel_offset */ |
| 102 | |
| 103 | /* A relative 15 bit relocation, right shifted by 3 */ |
| 104 | HOWTO (R_D30V_15_PCREL, /* type */ |
| 105 | 3, /* rightshift */ |
| 106 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 107 | 15, /* bitsize */ |
| 108 | true, /* pc_relative */ |
| 109 | 0, /* bitpos */ |
| 110 | complain_overflow_signed, /* complain_on_overflow */ |
| 111 | bfd_elf_generic_reloc, /* special_function */ |
| 112 | "R_D30V_15_PCREL", /* name */ |
| 113 | false, /* partial_inplace */ |
| 114 | 0xfff, /* src_mask */ |
| 115 | 0xfff, /* dst_mask */ |
| 116 | true), /* pcrel_offset */ |
| 117 | |
| 118 | /* An absolute 21 bit relocation, right shifted by 3 */ |
| 119 | HOWTO (R_D30V_21_PCREL, /* type */ |
| 120 | 3, /* rightshift */ |
| 121 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 122 | 21, /* bitsize */ |
| 123 | false, /* pc_relative */ |
| 124 | 0, /* bitpos */ |
| 125 | complain_overflow_signed, /* complain_on_overflow */ |
| 126 | bfd_elf_generic_reloc, /* special_function */ |
| 127 | "R_D30V_21", /* name */ |
| 128 | false, /* partial_inplace */ |
| 129 | 0x3ffff, /* src_mask */ |
| 130 | 0x3ffff, /* dst_mask */ |
| 131 | false), /* pcrel_offset */ |
| 132 | |
| 133 | /* A relative 21 bit relocation, right shifted by 3 */ |
| 134 | HOWTO (R_D30V_21_PCREL, /* type */ |
| 135 | 3, /* rightshift */ |
| 136 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 137 | 21, /* bitsize */ |
| 138 | true, /* pc_relative */ |
| 139 | 0, /* bitpos */ |
| 140 | complain_overflow_signed, /* complain_on_overflow */ |
| 141 | bfd_elf_generic_reloc, /* special_function */ |
| 142 | "R_D30V_21_PCREL", /* name */ |
| 143 | false, /* partial_inplace */ |
| 144 | 0x3ffff, /* src_mask */ |
| 145 | 0x3ffff, /* dst_mask */ |
| 146 | true), /* pcrel_offset */ |
| 147 | |
| 148 | /* A D30V 32 bit absolute relocation */ |
| 149 | HOWTO (R_D30V_32, /* type */ |
| 150 | 0, /* rightshift */ |
| 151 | 4, /* size (0 = byte, 1 = short, 2 = long) */ |
| 152 | 32, /* bitsize */ |
| 153 | false, /* pc_relative */ |
| 154 | 0, /* bitpos */ |
| 155 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 156 | bfd_elf_d30v_reloc, /* special_function */ |
| 157 | "R_D30V_32", /* name */ |
| 158 | false, /* partial_inplace */ |
| 159 | 0xffffffff, /* src_mask */ |
| 160 | 0xffffffff, /* dst_mask */ |
| 161 | false), /* pcrel_offset */ |
| 162 | |
| 163 | /* A relative 32 bit relocation */ |
| 164 | HOWTO (R_D30V_32_PCREL, /* type */ |
| 165 | 0, /* rightshift */ |
| 166 | 4, /* size (0 = byte, 1 = short, 2 = long) */ |
| 167 | 32, /* bitsize */ |
| 168 | true, /* pc_relative */ |
| 169 | 0, /* bitpos */ |
| 170 | complain_overflow_signed, /* complain_on_overflow */ |
| 171 | bfd_elf_d30v_reloc, /* special_function */ |
| 172 | "R_D30V_32_PCREL", /* name */ |
| 173 | false, /* partial_inplace */ |
| 174 | 0xffffffff, /* src_mask */ |
| 175 | 0xffffffff, /* dst_mask */ |
| 176 | true), /* pcrel_offset */ |
| 177 | |
| 178 | /* A regular 32 bit absolute relocation */ |
| 179 | HOWTO (R_D30V_32_NORMAL, /* type */ |
| 180 | 0, /* rightshift */ |
| 181 | 4, /* size (0 = byte, 1 = short, 2 = long) */ |
| 182 | 32, /* bitsize */ |
| 183 | false, /* pc_relative */ |
| 184 | 0, /* bitpos */ |
| 185 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 186 | bfd_elf_generic_reloc, /* special_function */ |
| 187 | "R_D30V_32_NORMAL", /* name */ |
| 188 | false, /* partial_inplace */ |
| 189 | 0xffffffff, /* src_mask */ |
| 190 | 0xffffffff, /* dst_mask */ |
| 191 | false), /* pcrel_offset */ |
| 192 | |
| 193 | }; |
| 194 | |
| 195 | static bfd_reloc_status_type |
| 196 | bfd_elf_d30v_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd, error_message) |
| 197 | bfd *abfd; |
| 198 | arelent *reloc_entry; |
| 199 | asymbol *symbol; |
| 200 | PTR data; |
| 201 | asection *input_section; |
| 202 | bfd *output_bfd; |
| 203 | char **error_message; |
| 204 | { |
| 205 | bfd_vma relocation; |
| 206 | bfd_vma in1, in2; |
| 207 | bfd_reloc_status_type r; |
| 208 | asection *reloc_target_output_section; |
| 209 | bfd_size_type addr = reloc_entry->address; |
| 210 | bfd_reloc_status_type flag = bfd_reloc_ok; |
| 211 | bfd_vma output_base = 0; |
| 212 | reloc_howto_type *howto = reloc_entry->howto; |
| 213 | |
| 214 | r = bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, |
| 215 | input_section, output_bfd, error_message); |
| 216 | if (r != bfd_reloc_continue) |
| 217 | return r; |
| 218 | |
| 219 | /* a hacked-up version of bfd_perform_reloc() follows */ |
| 220 | |
| 221 | /* Is the address of the relocation really within the section? */ |
| 222 | if (reloc_entry->address > input_section->_cooked_size) |
| 223 | return bfd_reloc_outofrange; |
| 224 | |
| 225 | /* Work out which section the relocation is targetted at and the |
| 226 | initial relocation command value. */ |
| 227 | |
| 228 | /* Get symbol value. (Common symbols are special.) */ |
| 229 | if (bfd_is_com_section (symbol->section)) |
| 230 | relocation = 0; |
| 231 | else |
| 232 | relocation = symbol->value; |
| 233 | |
| 234 | |
| 235 | reloc_target_output_section = symbol->section->output_section; |
| 236 | |
| 237 | /* Convert input-section-relative symbol value to absolute. */ |
| 238 | if (output_bfd) |
| 239 | output_base = 0; |
| 240 | else |
| 241 | output_base = reloc_target_output_section->vma; |
| 242 | |
| 243 | relocation += output_base + symbol->section->output_offset; |
| 244 | |
| 245 | /* Add in supplied addend. */ |
| 246 | relocation += reloc_entry->addend; |
| 247 | |
| 248 | /* Here the variable relocation holds the final address of the |
| 249 | symbol we are relocating against, plus any addend. */ |
| 250 | |
| 251 | if (howto->pc_relative == true) |
| 252 | { |
| 253 | relocation -= input_section->output_section->vma + input_section->output_offset; |
| 254 | |
| 255 | if (howto->pcrel_offset == true) |
| 256 | relocation -= reloc_entry->address; |
| 257 | } |
| 258 | |
| 259 | if (output_bfd != (bfd *) NULL) |
| 260 | { |
| 261 | /* This is a partial relocation, and we want to apply the relocation |
| 262 | to the reloc entry rather than the raw data. Modify the reloc |
| 263 | inplace to reflect what we now know. */ |
| 264 | reloc_entry->addend = relocation; |
| 265 | reloc_entry->address += input_section->output_offset; |
| 266 | return flag; |
| 267 | } |
| 268 | else |
| 269 | reloc_entry->addend = 0; |
| 270 | |
| 271 | in1 = bfd_get_32 (abfd, (bfd_byte *) data + addr); |
| 272 | in2 = bfd_get_32 (abfd, (bfd_byte *) data + addr + 4); |
| 273 | |
| 274 | printf("D30V 32-bit reloc at addr 0x%lx insn=0x%08x%08x\n",(long)relocation, (int)in1, (int)in2); |
| 275 | bfd_put_32 (abfd, in1, (bfd_byte *) data + addr); |
| 276 | bfd_put_32 (abfd, in2, (bfd_byte *) data + addr + 4); |
| 277 | |
| 278 | return flag; |
| 279 | } |
| 280 | |
| 281 | /* Map BFD reloc types to D30V ELF reloc types. */ |
| 282 | |
| 283 | struct d30v_reloc_map |
| 284 | { |
| 285 | unsigned char bfd_reloc_val; |
| 286 | unsigned char elf_reloc_val; |
| 287 | }; |
| 288 | |
| 289 | |
| 290 | static const struct d30v_reloc_map d30v_reloc_map[] = |
| 291 | { |
| 292 | { BFD_RELOC_NONE, R_D30V_NONE, }, |
| 293 | { BFD_RELOC_D30V_6, R_D30V_6 }, |
| 294 | { BFD_RELOC_D30V_15, R_D30V_15 }, |
| 295 | { BFD_RELOC_D30V_15_PCREL, R_D30V_15_PCREL }, |
| 296 | { BFD_RELOC_D30V_21, R_D30V_21 }, |
| 297 | { BFD_RELOC_D30V_21_PCREL, R_D30V_21_PCREL }, |
| 298 | { BFD_RELOC_D30V_32, R_D30V_32 }, |
| 299 | { BFD_RELOC_D30V_32_PCREL, R_D30V_32_PCREL }, |
| 300 | { BFD_RELOC_32, R_D30V_32_NORMAL }, |
| 301 | }; |
| 302 | |
| 303 | static reloc_howto_type * |
| 304 | bfd_elf32_bfd_reloc_type_lookup (abfd, code) |
| 305 | bfd *abfd; |
| 306 | bfd_reloc_code_real_type code; |
| 307 | { |
| 308 | unsigned int i; |
| 309 | |
| 310 | for (i = 0; |
| 311 | i < sizeof (d30v_reloc_map) / sizeof (struct d30v_reloc_map); |
| 312 | i++) |
| 313 | { |
| 314 | if (d30v_reloc_map[i].bfd_reloc_val == code) |
| 315 | return &elf_d30v_howto_table[d30v_reloc_map[i].elf_reloc_val]; |
| 316 | } |
| 317 | |
| 318 | return NULL; |
| 319 | } |
| 320 | |
| 321 | /* Set the howto pointer for an D30V ELF reloc. */ |
| 322 | |
| 323 | static void |
| 324 | d30v_info_to_howto_rel (abfd, cache_ptr, dst) |
| 325 | bfd *abfd; |
| 326 | arelent *cache_ptr; |
| 327 | Elf32_Internal_Rel *dst; |
| 328 | { |
| 329 | unsigned int r_type; |
| 330 | |
| 331 | r_type = ELF32_R_TYPE (dst->r_info); |
| 332 | BFD_ASSERT (r_type < (unsigned int) R_D30V_max); |
| 333 | cache_ptr->howto = &elf_d30v_howto_table[r_type]; |
| 334 | } |
| 335 | |
| 336 | #define ELF_ARCH bfd_arch_d30v |
| 337 | #define ELF_MACHINE_CODE EM_CYGNUS_D30V |
| 338 | #define ELF_MAXPAGESIZE 0x1000 |
| 339 | |
| 340 | #define TARGET_BIG_SYM bfd_elf32_d30v_vec |
| 341 | #define TARGET_BIG_NAME "elf32-d30v" |
| 342 | |
| 343 | #define elf_info_to_howto 0 |
| 344 | #define elf_info_to_howto_rel d30v_info_to_howto_rel |
| 345 | #define elf_backend_object_p 0 |
| 346 | #define elf_backend_final_write_processing 0 |
| 347 | |
| 348 | #include "elf32-target.h" |