Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame^] | 1 | /* Generate ELF backend handle. |
| 2 | Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005 Red Hat, Inc. |
| 3 | |
| 4 | This program is Open Source software; you can redistribute it and/or |
| 5 | modify it under the terms of the Open Software License version 1.0 as |
| 6 | published by the Open Source Initiative. |
| 7 | |
| 8 | You should have received a copy of the Open Software License along |
| 9 | with this program; if not, you may obtain a copy of the Open Software |
| 10 | License version 1.0 from http://www.opensource.org/licenses/osl.php or |
| 11 | by writing the Open Source Initiative c/o Lawrence Rosen, Esq., |
| 12 | 3001 King Ranch Road, Ukiah, CA 95482. */ |
| 13 | |
| 14 | #ifdef HAVE_CONFIG_H |
| 15 | # include <config.h> |
| 16 | #endif |
| 17 | |
| 18 | #include <assert.h> |
| 19 | #include <dlfcn.h> |
| 20 | #include <error.h> |
| 21 | #include <gelf.h> |
| 22 | #include <stdlib.h> |
| 23 | #include <string.h> |
| 24 | |
| 25 | #include <libeblP.h> |
| 26 | |
| 27 | |
| 28 | /* This table should contain the complete list of architectures as far |
| 29 | as the ELF specification is concerned. */ |
| 30 | /* XXX When things are stable replace the string pointers with char |
| 31 | arrays to avoid relocations. */ |
| 32 | static const struct |
| 33 | { |
| 34 | const char *dsoname; |
| 35 | const char *emulation; |
| 36 | const char *prefix; |
| 37 | int prefix_len; |
| 38 | int em; |
| 39 | } machines[] = |
| 40 | { |
| 41 | { "i386", "elf_i386", "i386", 4, EM_386 }, |
| 42 | { "ia64", "elf_ia64", "ia64", 4, EM_IA_64 }, |
| 43 | { "alpha", "elf_alpha", "alpha", 5, EM_ALPHA }, |
| 44 | { "x86_64", "elf_x86_64", "x86_64", 6, EM_X86_64 }, |
| 45 | { "sh", "elf_sh", "sh", 2, EM_SH }, |
| 46 | { "arm", "ebl_arm", "arm", 3, EM_ARM }, |
| 47 | { "sparc", "elf_sparcv9", "sparc", 5, EM_SPARCV9 }, |
| 48 | { "sparc", "elf_sparc", "sparc", 5, EM_SPARC }, |
| 49 | { "sparc", "elf_sparcv8plus", "sparc", 5, EM_SPARC32PLUS }, |
| 50 | |
| 51 | { "m32", "elf_m32", "m32", 3, EM_M32 }, |
| 52 | { "m68k", "elf_m68k", "m68k", 4, EM_68K }, |
| 53 | { "m88k", "elf_m88k", "m88k", 4, EM_88K }, |
| 54 | { "i860", "elf_i860", "i860", 4, EM_860 }, |
| 55 | { "mips", "elf_mips", "mips", 4, EM_MIPS }, |
| 56 | { "s370", "ebl_s370", "s370", 4, EM_S370 }, |
| 57 | { "mips", "elf_mipsel", "mips", 4, EM_MIPS_RS3_LE }, |
| 58 | { "parisc", "elf_parisc", "parisc", 6, EM_PARISC }, |
| 59 | { "vpp500", "elf_vpp500", "vpp500", 5, EM_VPP500 }, |
| 60 | { "sparc", "elf_v8plus", "v8plus", 6, EM_SPARC32PLUS }, |
| 61 | { "i960", "elf_i960", "i960", 4, EM_960 }, |
| 62 | { "ppc", "elf_ppc", "ppc", 3, EM_PPC }, |
| 63 | { "ppc64", "elf_ppc64", "ppc64", 5, EM_PPC64 }, |
| 64 | { "s390", "ebl_s390", "s390", 4, EM_S390 }, |
| 65 | { "v800", "ebl_v800", "v800", 4, EM_V800 }, |
| 66 | { "fr20", "ebl_fr20", "fr20", 4, EM_FR20 }, |
| 67 | { "rh32", "ebl_rh32", "rh32", 4, EM_RH32 }, |
| 68 | { "rce", "ebl_rce", "rce", 3, EM_RCE }, |
| 69 | { "tricore", "elf_tricore", "tricore", 7, EM_TRICORE }, |
| 70 | { "arc", "elf_arc", "arc", 3, EM_ARC }, |
| 71 | { "h8", "elf_h8_300", "h8_300", 6, EM_H8_300 }, |
| 72 | { "h8", "elf_h8_300h", "h8_300h", 6, EM_H8_300H }, |
| 73 | { "h8", "elf_h8s", "h8s", 6, EM_H8S }, |
| 74 | { "h8", "elf_h8_500", "h8_500", 6, EM_H8_500 }, |
| 75 | { "mips_x", "elf_mips_x", "mips_x", 6, EM_MIPS_X }, |
| 76 | { "coldfire", "elf_coldfire", "coldfire", 8, EM_COLDFIRE }, |
| 77 | { "m68k", "elf_68hc12", "68hc12", 6, EM_68HC12 }, |
| 78 | { "mma", "elf_mma", "mma", 3, EM_MMA }, |
| 79 | { "pcp", "elf_pcp", "pcp", 3, EM_PCP }, |
| 80 | { "ncpu", "elf_ncpu", "ncpu", 4, EM_NCPU }, |
| 81 | { "ndr1", "elf_ndr1", "ndr1", 4, EM_NDR1 }, |
| 82 | { "starcore", "elf_starcore", "starcore", 8, EM_STARCORE }, |
| 83 | { "me16", "elf_me16", "em16", 4, EM_ME16 }, |
| 84 | { "st100", "elf_st100", "st100", 5, EM_ST100 }, |
| 85 | { "tinyj", "elf_tinyj", "tinyj", 5, EM_TINYJ }, |
| 86 | { "pdsp", "elf_pdsp", "pdsp", 4, EM_PDSP }, |
| 87 | { "fx66", "elf_fx66", "fx66", 4, EM_FX66 }, |
| 88 | { "st9plus", "elf_st9plus", "st9plus", 7, EM_ST9PLUS }, |
| 89 | { "st7", "elf_st7", "st7", 3, EM_ST7 }, |
| 90 | { "m68k", "elf_68hc16", "68hc16", 6, EM_68HC16 }, |
| 91 | { "m68k", "elf_68hc11", "68hc11", 6, EM_68HC11 }, |
| 92 | { "m68k", "elf_68hc08", "68hc08", 6, EM_68HC08 }, |
| 93 | { "m68k", "elf_68hc05", "68hc05", 6, EM_68HC05 }, |
| 94 | { "svx", "elf_svx", "svx", 3, EM_SVX }, |
| 95 | { "st19", "elf_st19", "st19", 4, EM_ST19 }, |
| 96 | { "vax", "elf_vax", "vax", 3, EM_VAX }, |
| 97 | { "cris", "elf_cris", "cris", 4, EM_CRIS }, |
| 98 | { "javelin", "elf_javelin", "javelin", 7, EM_JAVELIN }, |
| 99 | { "firepath", "elf_firepath", "firepath", 8, EM_FIREPATH }, |
| 100 | { "zsp", "elf_zsp", "zsp", 3, EM_ZSP}, |
| 101 | { "mmix", "elf_mmix", "mmix", 4, EM_MMIX }, |
| 102 | { "hunay", "elf_huany", "huany", 5, EM_HUANY }, |
| 103 | { "prism", "elf_prism", "prism", 5, EM_PRISM }, |
| 104 | { "avr", "elf_avr", "avr", 3, EM_AVR }, |
| 105 | { "fr30", "elf_fr30", "fr30", 4, EM_FR30 }, |
| 106 | { "dv10", "elf_dv10", "dv10", 4, EM_D10V }, |
| 107 | { "dv30", "elf_dv30", "dv30", 4, EM_D30V }, |
| 108 | { "v850", "elf_v850", "v850", 4, EM_V850 }, |
| 109 | { "m32r", "elf_m32r", "m32r", 4, EM_M32R }, |
| 110 | { "mn10300", "elf_mn10300", "mn10300", 7, EM_MN10300 }, |
| 111 | { "mn10200", "elf_mn10200", "mn10200", 7, EM_MN10200 }, |
| 112 | { "pj", "elf_pj", "pj", 2, EM_PJ }, |
| 113 | { "openrisc", "elf_openrisc", "openrisc", 8, EM_OPENRISC }, |
| 114 | { "arc", "elf_arc_a5", "arc_a5", 6, EM_ARC_A5 }, |
| 115 | { "xtensa", "elf_xtensa", "xtensa", 6, EM_XTENSA }, |
| 116 | }; |
| 117 | #define nmachines (sizeof (machines) / sizeof (machines[0])) |
| 118 | |
| 119 | |
| 120 | /* Default callbacks. Mostly they just return the error value. */ |
| 121 | static const char *default_object_type_name (int ignore, char *buf, |
| 122 | size_t len); |
| 123 | static const char *default_reloc_type_name (int ignore, char *buf, size_t len); |
| 124 | static bool default_reloc_type_check (int ignore); |
| 125 | static bool default_reloc_valid_use (Elf *elf, int ignore); |
| 126 | static Elf_Type default_reloc_simple_type (Elf *elf, int ignore); |
| 127 | static bool default_gotpc_reloc_check (Elf *elf, int ignore); |
| 128 | static const char *default_segment_type_name (int ignore, char *buf, |
| 129 | size_t len); |
| 130 | static const char *default_section_type_name (int ignore, char *buf, |
| 131 | size_t len); |
| 132 | static const char *default_section_name (int ignore, int ignore2, char *buf, |
| 133 | size_t len); |
| 134 | static const char *default_machine_flag_name (Elf64_Word *ignore); |
| 135 | static bool default_machine_flag_check (Elf64_Word flags); |
| 136 | static const char *default_symbol_type_name (int ignore, char *buf, |
| 137 | size_t len); |
| 138 | static const char *default_symbol_binding_name (int ignore, char *buf, |
| 139 | size_t len); |
| 140 | static const char *default_dynamic_tag_name (int64_t ignore, char *buf, |
| 141 | size_t len); |
| 142 | static bool default_dynamic_tag_check (int64_t ignore); |
| 143 | static GElf_Word default_sh_flags_combine (GElf_Word flags1, GElf_Word flags2); |
| 144 | static const char *default_osabi_name (int ignore, char *buf, size_t len); |
| 145 | static void default_destr (struct ebl *ignore); |
| 146 | static const char *default_core_note_type_name (uint32_t, char *buf, |
| 147 | size_t len); |
| 148 | static const char *default_object_note_type_name (uint32_t, char *buf, |
| 149 | size_t len); |
| 150 | static bool default_core_note (const char *name, uint32_t type, |
| 151 | uint32_t descsz, const char *desc); |
| 152 | static bool default_object_note (const char *name, uint32_t type, |
| 153 | uint32_t descsz, const char *desc); |
| 154 | static bool default_debugscn_p (const char *name); |
| 155 | static bool default_copy_reloc_p (int reloc); |
| 156 | |
| 157 | |
| 158 | static void |
| 159 | fill_defaults (Ebl *result) |
| 160 | { |
| 161 | result->object_type_name = default_object_type_name; |
| 162 | result->reloc_type_name = default_reloc_type_name; |
| 163 | result->reloc_type_check = default_reloc_type_check; |
| 164 | result->reloc_valid_use = default_reloc_valid_use; |
| 165 | result->reloc_simple_type = default_reloc_simple_type; |
| 166 | result->gotpc_reloc_check = default_gotpc_reloc_check; |
| 167 | result->segment_type_name = default_segment_type_name; |
| 168 | result->section_type_name = default_section_type_name; |
| 169 | result->section_name = default_section_name; |
| 170 | result->machine_flag_name = default_machine_flag_name; |
| 171 | result->machine_flag_check = default_machine_flag_check; |
| 172 | result->symbol_type_name = default_symbol_type_name; |
| 173 | result->symbol_binding_name = default_symbol_binding_name; |
| 174 | result->dynamic_tag_name = default_dynamic_tag_name; |
| 175 | result->dynamic_tag_check = default_dynamic_tag_check; |
| 176 | result->sh_flags_combine = default_sh_flags_combine; |
| 177 | result->osabi_name = default_osabi_name; |
| 178 | result->core_note_type_name = default_core_note_type_name; |
| 179 | result->object_note_type_name = default_object_note_type_name; |
| 180 | result->core_note = default_core_note; |
| 181 | result->object_note = default_object_note; |
| 182 | result->debugscn_p = default_debugscn_p; |
| 183 | result->copy_reloc_p = default_copy_reloc_p; |
| 184 | result->destr = default_destr; |
| 185 | } |
| 186 | |
| 187 | |
| 188 | /* Find an appropriate backend for the file associated with ELF. */ |
| 189 | static Ebl * |
| 190 | openbackend (elf, emulation, machine) |
| 191 | Elf *elf; |
| 192 | const char *emulation; |
| 193 | GElf_Half machine; |
| 194 | { |
| 195 | Ebl *result; |
| 196 | size_t cnt; |
| 197 | |
| 198 | /* First allocate the data structure for the result. We do this |
| 199 | here since this assures that the structure is always large |
| 200 | enough. */ |
| 201 | result = (Ebl *) calloc (1, sizeof (Ebl)); |
| 202 | if (result == NULL) |
| 203 | { |
| 204 | // XXX uncomment |
| 205 | // __libebl_seterror (ELF_E_NOMEM); |
| 206 | return NULL; |
| 207 | } |
| 208 | |
| 209 | /* Fill in the default callbacks. The initializer for the machine |
| 210 | specific module can overwrite the values. */ |
| 211 | fill_defaults (result); |
| 212 | |
| 213 | /* XXX Currently all we do is to look at 'e_machine' value in the |
| 214 | ELF header. With an internal mapping table from EM_* value to |
| 215 | DSO name we try to load the appropriate module to handle this |
| 216 | binary type. |
| 217 | |
| 218 | Multiple modules for the same machine type are possible and they |
| 219 | will be tried in sequence. The lookup process will only stop |
| 220 | when a module which can handle the machine type is found or all |
| 221 | available matching modules are tried. */ |
| 222 | for (cnt = 0; cnt < nmachines; ++cnt) |
| 223 | if ((emulation != NULL && strcmp (emulation, machines[cnt].emulation) == 0) |
| 224 | || (emulation == NULL && machines[cnt].em == machine)) |
| 225 | { |
| 226 | /* Well, we know the emulation name now. */ |
| 227 | result->emulation = machines[cnt].emulation; |
| 228 | |
| 229 | #ifndef LIBEBL_SUBDIR |
| 230 | # define LIBEBL_SUBDIR PACKAGE |
| 231 | #endif |
| 232 | #define ORIGINDIR "$ORIGIN/../$LIB/" LIBEBL_SUBDIR "/" |
| 233 | |
| 234 | /* Give it a try. At least the machine type matches. First |
| 235 | try to load the module. */ |
| 236 | char dsoname[100]; |
| 237 | strcpy (stpcpy (stpcpy (dsoname, ORIGINDIR "libebl_"), |
| 238 | machines[cnt].dsoname), |
| 239 | ".so"); |
| 240 | |
| 241 | void *h = dlopen (dsoname, RTLD_LAZY); |
| 242 | if (h == NULL) |
| 243 | { |
| 244 | strcpy (stpcpy (stpcpy (dsoname, "libebl_"), |
| 245 | machines[cnt].dsoname), |
| 246 | ".so"); |
| 247 | h = dlopen (dsoname, RTLD_LAZY); |
| 248 | } |
| 249 | |
| 250 | /* Try without an explicit path. */ |
| 251 | if (h != NULL) |
| 252 | { |
| 253 | /* We managed to load the object. Now see whether the |
| 254 | initialization function likes our file. */ |
| 255 | static const char version[] = MODVERSION; |
| 256 | const char *modversion; |
| 257 | ebl_bhinit_t initp; |
| 258 | char symname[machines[cnt].prefix_len + sizeof "_init"]; |
| 259 | |
| 260 | strcpy (mempcpy (symname, machines[cnt].prefix, |
| 261 | machines[cnt].prefix_len), "_init"); |
| 262 | |
| 263 | initp = (ebl_bhinit_t) dlsym (h, symname); |
| 264 | if (initp != NULL |
| 265 | && (modversion = initp (elf, machine, result, sizeof (Ebl))) |
| 266 | && strcmp (version, modversion) == 0) |
| 267 | { |
| 268 | /* We found a module to handle our file. */ |
| 269 | result->dlhandle = h; |
| 270 | result->elf = elf; |
| 271 | |
| 272 | /* A few entries are mandatory. */ |
| 273 | assert (result->name != NULL); |
| 274 | assert (result->destr != NULL); |
| 275 | |
| 276 | return result; |
| 277 | } |
| 278 | |
| 279 | /* Not the module we need. */ |
| 280 | (void) dlclose (h); |
| 281 | } |
| 282 | |
| 283 | /* We cannot find a DSO but the emulation/machine ID matches. |
| 284 | Return that information. */ |
| 285 | result->dlhandle = NULL; |
| 286 | result->elf = elf; |
| 287 | result->name = machines[cnt].prefix; |
| 288 | fill_defaults (result); |
| 289 | |
| 290 | return result; |
| 291 | } |
| 292 | |
| 293 | /* Nothing matched. We use only the default callbacks. */ |
| 294 | result->dlhandle = NULL; |
| 295 | result->elf = elf; |
| 296 | result->emulation = "<unknown>"; |
| 297 | result->name = "<unknown>"; |
| 298 | fill_defaults (result); |
| 299 | |
| 300 | return result; |
| 301 | } |
| 302 | |
| 303 | |
| 304 | /* Find an appropriate backend for the file associated with ELF. */ |
| 305 | Ebl * |
| 306 | ebl_openbackend (elf) |
| 307 | Elf *elf; |
| 308 | { |
| 309 | GElf_Ehdr ehdr_mem; |
| 310 | GElf_Ehdr *ehdr; |
| 311 | |
| 312 | /* Get the ELF header of the object. */ |
| 313 | ehdr = gelf_getehdr (elf, &ehdr_mem); |
| 314 | if (ehdr == NULL) |
| 315 | { |
| 316 | // XXX uncomment |
| 317 | // __libebl_seterror (elf_errno ()); |
| 318 | return NULL; |
| 319 | } |
| 320 | |
| 321 | return openbackend (elf, NULL, ehdr->e_machine); |
| 322 | } |
| 323 | |
| 324 | |
| 325 | /* Find backend without underlying ELF file. */ |
| 326 | Ebl * |
| 327 | ebl_openbackend_machine (machine) |
| 328 | GElf_Half machine; |
| 329 | { |
| 330 | return openbackend (NULL, NULL, machine); |
| 331 | } |
| 332 | |
| 333 | |
| 334 | /* Find backend with given emulation name. */ |
| 335 | Ebl * |
| 336 | ebl_openbackend_emulation (const char *emulation) |
| 337 | { |
| 338 | return openbackend (NULL, emulation, EM_NONE); |
| 339 | } |
| 340 | |
| 341 | |
| 342 | /* Default callbacks. Mostly they just return the error value. */ |
| 343 | static const char * |
| 344 | default_object_type_name (int ignore __attribute__ ((unused)), |
| 345 | char *buf __attribute__ ((unused)), |
| 346 | size_t len __attribute__ ((unused))) |
| 347 | { |
| 348 | return NULL; |
| 349 | } |
| 350 | |
| 351 | static const char * |
| 352 | default_reloc_type_name (int ignore __attribute__ ((unused)), |
| 353 | char *buf __attribute__ ((unused)), |
| 354 | size_t len __attribute__ ((unused))) |
| 355 | { |
| 356 | return NULL; |
| 357 | } |
| 358 | |
| 359 | static bool |
| 360 | default_reloc_type_check (int ignore __attribute__ ((unused))) |
| 361 | { |
| 362 | return false; |
| 363 | } |
| 364 | |
| 365 | static bool |
| 366 | default_reloc_valid_use (Elf *elf __attribute__ ((unused)), |
| 367 | int ignore __attribute__ ((unused))) |
| 368 | { |
| 369 | return false; |
| 370 | } |
| 371 | |
| 372 | static Elf_Type |
| 373 | default_reloc_simple_type (Elf *elf __attribute__ ((unused)), |
| 374 | int ignore __attribute__ ((unused))) |
| 375 | { |
| 376 | return ELF_T_NUM; |
| 377 | } |
| 378 | |
| 379 | static bool |
| 380 | default_gotpc_reloc_check (Elf *elf __attribute__ ((unused)), |
| 381 | int ignore __attribute__ ((unused))) |
| 382 | { |
| 383 | return false; |
| 384 | } |
| 385 | |
| 386 | static const char * |
| 387 | default_segment_type_name (int ignore __attribute__ ((unused)), |
| 388 | char *buf __attribute__ ((unused)), |
| 389 | size_t len __attribute__ ((unused))) |
| 390 | { |
| 391 | return NULL; |
| 392 | } |
| 393 | |
| 394 | static const char * |
| 395 | default_section_type_name (int ignore __attribute__ ((unused)), |
| 396 | char *buf __attribute__ ((unused)), |
| 397 | size_t len __attribute__ ((unused))) |
| 398 | { |
| 399 | return NULL; |
| 400 | } |
| 401 | |
| 402 | static const char * |
| 403 | default_section_name (int ignore __attribute__ ((unused)), |
| 404 | int ignore2 __attribute__ ((unused)), |
| 405 | char *buf __attribute__ ((unused)), |
| 406 | size_t len __attribute__ ((unused))) |
| 407 | { |
| 408 | return NULL; |
| 409 | } |
| 410 | |
| 411 | static const char * |
| 412 | default_machine_flag_name (Elf64_Word *ignore __attribute__ ((unused))) |
| 413 | { |
| 414 | return NULL; |
| 415 | } |
| 416 | |
| 417 | static bool |
| 418 | default_machine_flag_check (Elf64_Word flags __attribute__ ((unused))) |
| 419 | { |
| 420 | return flags == 0; |
| 421 | } |
| 422 | |
| 423 | static const char * |
| 424 | default_symbol_type_name (int ignore __attribute__ ((unused)), |
| 425 | char *buf __attribute__ ((unused)), |
| 426 | size_t len __attribute__ ((unused))) |
| 427 | { |
| 428 | return NULL; |
| 429 | } |
| 430 | |
| 431 | static const char * |
| 432 | default_symbol_binding_name (int ignore __attribute__ ((unused)), |
| 433 | char *buf __attribute__ ((unused)), |
| 434 | size_t len __attribute__ ((unused))) |
| 435 | { |
| 436 | return NULL; |
| 437 | } |
| 438 | |
| 439 | static const char * |
| 440 | default_dynamic_tag_name (int64_t ignore __attribute__ ((unused)), |
| 441 | char *buf __attribute__ ((unused)), |
| 442 | size_t len __attribute__ ((unused))) |
| 443 | { |
| 444 | return NULL; |
| 445 | } |
| 446 | |
| 447 | static bool |
| 448 | default_dynamic_tag_check (int64_t ignore __attribute__ ((unused))) |
| 449 | { |
| 450 | return false; |
| 451 | } |
| 452 | |
| 453 | static GElf_Word |
| 454 | default_sh_flags_combine (GElf_Word flags1, GElf_Word flags2) |
| 455 | { |
| 456 | return SH_FLAGS_COMBINE (flags1, flags2); |
| 457 | } |
| 458 | |
| 459 | static void |
| 460 | default_destr (struct ebl *ignore __attribute__ ((unused))) |
| 461 | { |
| 462 | } |
| 463 | |
| 464 | static const char * |
| 465 | default_osabi_name (int ignore __attribute__ ((unused)), |
| 466 | char *buf __attribute__ ((unused)), |
| 467 | size_t len __attribute__ ((unused))) |
| 468 | { |
| 469 | return NULL; |
| 470 | } |
| 471 | |
| 472 | static const char * |
| 473 | default_core_note_type_name (uint32_t ignore __attribute__ ((unused)), |
| 474 | char *buf __attribute__ ((unused)), |
| 475 | size_t len __attribute__ ((unused))) |
| 476 | { |
| 477 | return NULL; |
| 478 | } |
| 479 | |
| 480 | static const char * |
| 481 | default_object_note_type_name (uint32_t ignore __attribute__ ((unused)), |
| 482 | char *buf __attribute__ ((unused)), |
| 483 | size_t len __attribute__ ((unused))) |
| 484 | { |
| 485 | return NULL; |
| 486 | } |
| 487 | |
| 488 | static bool |
| 489 | default_core_note (const char *name __attribute__ ((unused)), |
| 490 | uint32_t type __attribute__ ((unused)), |
| 491 | uint32_t descsz __attribute__ ((unused)), |
| 492 | const char *desc __attribute__ ((unused))) |
| 493 | { |
| 494 | return NULL; |
| 495 | } |
| 496 | |
| 497 | static bool |
| 498 | default_object_note (const char *name __attribute__ ((unused)), |
| 499 | uint32_t type __attribute__ ((unused)), |
| 500 | uint32_t descsz __attribute__ ((unused)), |
| 501 | const char *desc __attribute__ ((unused))) |
| 502 | { |
| 503 | return NULL; |
| 504 | } |
| 505 | |
| 506 | static bool |
| 507 | default_debugscn_p (const char *name) |
| 508 | { |
| 509 | /* We know by default only about the DWARF debug sections which have |
| 510 | fixed names. */ |
| 511 | static const char *dwarf_scn_names[] = |
| 512 | { |
| 513 | /* DWARF 1 */ |
| 514 | ".debug", |
| 515 | ".line", |
| 516 | /* GNU DWARF 1 extensions */ |
| 517 | ".debug_srcinfo", |
| 518 | ".debug_sfnames", |
| 519 | /* DWARF 1.1 and DWARF 2 */ |
| 520 | ".debug_aranges", |
| 521 | ".debug_pubnames", |
| 522 | /* DWARF 2 */ |
| 523 | ".debug_info", |
| 524 | ".debug_abbrev", |
| 525 | ".debug_line", |
| 526 | ".debug_frame", |
| 527 | ".debug_str", |
| 528 | ".debug_loc", |
| 529 | ".debug_macinfo", |
| 530 | /* DWARF 3 */ |
| 531 | ".debug_ranges", |
| 532 | /* SGI/MIPS DWARF 2 extensions */ |
| 533 | ".debug_weaknames", |
| 534 | ".debug_funcnames", |
| 535 | ".debug_typenames", |
| 536 | ".debug_varnames" |
| 537 | }; |
| 538 | const size_t ndwarf_scn_names = (sizeof (dwarf_scn_names) |
| 539 | / sizeof (dwarf_scn_names[0])); |
| 540 | for (size_t cnt = 0; cnt < ndwarf_scn_names; ++cnt) |
| 541 | if (strcmp (name, dwarf_scn_names[cnt]) == 0) |
| 542 | return true; |
| 543 | |
| 544 | return false; |
| 545 | } |
| 546 | |
| 547 | static bool |
| 548 | default_copy_reloc_p (int reloc __attribute__ ((unused))) |
| 549 | { |
| 550 | return false; |
| 551 | } |