1 /* Generate ELF backend handle. 2 Copyright (C) 2000,2001,2002,2003,2004,2005,2006,2007,2008 Red Hat, Inc. 3 This file is part of Red Hat elfutils. 4 5 Red Hat elfutils is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by the 7 Free Software Foundation; version 2 of the License. 8 9 Red Hat elfutils is distributed in the hope that it will be useful, but 10 WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 General Public License for more details. 13 14 You should have received a copy of the GNU General Public License along 15 with Red Hat elfutils; if not, write to the Free Software Foundation, 16 Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. 17 18 In addition, as a special exception, Red Hat, Inc. gives You the 19 additional right to link the code of Red Hat elfutils with code licensed 20 under any Open Source Initiative certified open source license 21 (http://www.opensource.org/licenses/index.php) which requires the 22 distribution of source code with any binary distribution and to 23 distribute linked combinations of the two. Non-GPL Code permitted under 24 this exception must only link to the code of Red Hat elfutils through 25 those well defined interfaces identified in the file named EXCEPTION 26 found in the source code files (the "Approved Interfaces"). The files 27 of Non-GPL Code may instantiate templates or use macros or inline 28 functions from the Approved Interfaces without causing the resulting 29 work to be covered by the GNU General Public License. Only Red Hat, 30 Inc. may make changes or additions to the list of Approved Interfaces. 31 Red Hat's grant of this exception is conditioned upon your not adding 32 any new exceptions. If you wish to add a new Approved Interface or 33 exception, please contact Red Hat. You must obey the GNU General Public 34 License in all respects for all of the Red Hat elfutils code and other 35 code used in conjunction with Red Hat elfutils except the Non-GPL Code 36 covered by this exception. If you modify this file, you may extend this 37 exception to your version of the file, but you are not obligated to do 38 so. If you do not wish to provide this exception without modification, 39 you must delete this exception statement from your version and license 40 this file solely under the GPL without exception. 41 42 Red Hat elfutils is an included package of the Open Invention Network. 43 An included package of the Open Invention Network is a package for which 44 Open Invention Network licensees cross-license their patents. No patent 45 license is granted, either expressly or impliedly, by designation as an 46 included package. Should you wish to participate in the Open Invention 47 Network licensing program, please visit www.openinventionnetwork.com 48 <http://www.openinventionnetwork.com>. */ 49 50 #ifdef HAVE_CONFIG_H 51 # include <config.h> 52 #endif 53 54 #include <assert.h> 55 #include <dlfcn.h> 56 #include <error.h> 57 #include <libelfP.h> 58 #include <dwarf.h> 59 #include <stdlib.h> 60 #include <string.h> 61 #include <stdio.h> 62 63 #include <libeblP.h> 64 65 66 /* This table should contain the complete list of architectures as far 67 as the ELF specification is concerned. */ 68 /* XXX When things are stable replace the string pointers with char 69 arrays to avoid relocations. */ 70 static const struct 71 { 72 const char *dsoname; 73 const char *emulation; 74 const char *prefix; 75 int prefix_len; 76 int em; 77 int class; 78 int data; 79 } machines[] = 80 { 81 { "i386", "elf_i386", "i386", 4, EM_386, ELFCLASS32, ELFDATA2LSB }, 82 { "ia64", "elf_ia64", "ia64", 4, EM_IA_64, ELFCLASS64, ELFDATA2LSB }, 83 { "alpha", "elf_alpha", "alpha", 5, EM_ALPHA, ELFCLASS64, ELFDATA2LSB }, 84 { "x86_64", "elf_x86_64", "x86_64", 6, EM_X86_64, ELFCLASS64, ELFDATA2LSB }, 85 { "ppc", "elf_ppc", "ppc", 3, EM_PPC, ELFCLASS32, ELFDATA2MSB }, 86 { "ppc64", "elf_ppc64", "ppc64", 5, EM_PPC64, ELFCLASS64, ELFDATA2MSB }, 87 // XXX class and machine fields need to be filled in for all archs. 88 { "sh", "elf_sh", "sh", 2, EM_SH, 0, 0 }, 89 { "arm", "ebl_arm", "arm", 3, EM_ARM, 0, 0 }, 90 { "sparc", "elf_sparcv9", "sparc", 5, EM_SPARCV9, 0, 0 }, 91 { "sparc", "elf_sparc", "sparc", 5, EM_SPARC, 0, 0 }, 92 { "sparc", "elf_sparcv8plus", "sparc", 5, EM_SPARC32PLUS, 0, 0 }, 93 { "s390", "ebl_s390", "s390", 4, EM_S390, 0, 0 }, 94 95 { "m32", "elf_m32", "m32", 3, EM_M32, 0, 0 }, 96 { "m68k", "elf_m68k", "m68k", 4, EM_68K, 0, 0 }, 97 { "m88k", "elf_m88k", "m88k", 4, EM_88K, 0, 0 }, 98 { "i860", "elf_i860", "i860", 4, EM_860, 0, 0 }, 99 { "s370", "ebl_s370", "s370", 4, EM_S370, 0, 0 }, 100 { "parisc", "elf_parisc", "parisc", 6, EM_PARISC, 0, 0 }, 101 { "vpp500", "elf_vpp500", "vpp500", 5, EM_VPP500, 0, 0 }, 102 { "sparc", "elf_v8plus", "v8plus", 6, EM_SPARC32PLUS, 0, 0 }, 103 { "i960", "elf_i960", "i960", 4, EM_960, 0, 0 }, 104 { "v800", "ebl_v800", "v800", 4, EM_V800, 0, 0 }, 105 { "fr20", "ebl_fr20", "fr20", 4, EM_FR20, 0, 0 }, 106 { "rh32", "ebl_rh32", "rh32", 4, EM_RH32, 0, 0 }, 107 { "rce", "ebl_rce", "rce", 3, EM_RCE, 0, 0 }, 108 { "tricore", "elf_tricore", "tricore", 7, EM_TRICORE, 0, 0 }, 109 { "arc", "elf_arc", "arc", 3, EM_ARC, 0, 0 }, 110 { "h8", "elf_h8_300", "h8_300", 6, EM_H8_300, 0, 0 }, 111 { "h8", "elf_h8_300h", "h8_300h", 6, EM_H8_300H, 0, 0 }, 112 { "h8", "elf_h8s", "h8s", 6, EM_H8S, 0, 0 }, 113 { "h8", "elf_h8_500", "h8_500", 6, EM_H8_500, 0, 0 }, 114 { "coldfire", "elf_coldfire", "coldfire", 8, EM_COLDFIRE, 0, 0 }, 115 { "m68k", "elf_68hc12", "68hc12", 6, EM_68HC12, 0, 0 }, 116 { "mma", "elf_mma", "mma", 3, EM_MMA, 0, 0 }, 117 { "pcp", "elf_pcp", "pcp", 3, EM_PCP, 0, 0 }, 118 { "ncpu", "elf_ncpu", "ncpu", 4, EM_NCPU, 0, 0 }, 119 { "ndr1", "elf_ndr1", "ndr1", 4, EM_NDR1, 0, 0 }, 120 { "starcore", "elf_starcore", "starcore", 8, EM_STARCORE, 0, 0 }, 121 { "me16", "elf_me16", "em16", 4, EM_ME16, 0, 0 }, 122 { "st100", "elf_st100", "st100", 5, EM_ST100, 0, 0 }, 123 { "tinyj", "elf_tinyj", "tinyj", 5, EM_TINYJ, 0, 0 }, 124 { "pdsp", "elf_pdsp", "pdsp", 4, EM_PDSP, 0, 0 }, 125 { "fx66", "elf_fx66", "fx66", 4, EM_FX66, 0, 0 }, 126 { "st9plus", "elf_st9plus", "st9plus", 7, EM_ST9PLUS, 0, 0 }, 127 { "st7", "elf_st7", "st7", 3, EM_ST7, 0, 0 }, 128 { "m68k", "elf_68hc16", "68hc16", 6, EM_68HC16, 0, 0 }, 129 { "m68k", "elf_68hc11", "68hc11", 6, EM_68HC11, 0, 0 }, 130 { "m68k", "elf_68hc08", "68hc08", 6, EM_68HC08, 0, 0 }, 131 { "m68k", "elf_68hc05", "68hc05", 6, EM_68HC05, 0, 0 }, 132 { "svx", "elf_svx", "svx", 3, EM_SVX, 0, 0 }, 133 { "st19", "elf_st19", "st19", 4, EM_ST19, 0, 0 }, 134 { "vax", "elf_vax", "vax", 3, EM_VAX, 0, 0 }, 135 { "cris", "elf_cris", "cris", 4, EM_CRIS, 0, 0 }, 136 { "javelin", "elf_javelin", "javelin", 7, EM_JAVELIN, 0, 0 }, 137 { "firepath", "elf_firepath", "firepath", 8, EM_FIREPATH, 0, 0 }, 138 { "zsp", "elf_zsp", "zsp", 3, EM_ZSP, 0, 0 }, 139 { "mmix", "elf_mmix", "mmix", 4, EM_MMIX, 0, 0 }, 140 { "hunay", "elf_huany", "huany", 5, EM_HUANY, 0, 0 }, 141 { "prism", "elf_prism", "prism", 5, EM_PRISM, 0, 0 }, 142 { "avr", "elf_avr", "avr", 3, EM_AVR, 0, 0 }, 143 { "fr30", "elf_fr30", "fr30", 4, EM_FR30, 0, 0 }, 144 { "dv10", "elf_dv10", "dv10", 4, EM_D10V, 0, 0 }, 145 { "dv30", "elf_dv30", "dv30", 4, EM_D30V, 0, 0 }, 146 { "v850", "elf_v850", "v850", 4, EM_V850, 0, 0 }, 147 { "m32r", "elf_m32r", "m32r", 4, EM_M32R, 0, 0 }, 148 { "mn10300", "elf_mn10300", "mn10300", 7, EM_MN10300, 0, 0 }, 149 { "mn10200", "elf_mn10200", "mn10200", 7, EM_MN10200, 0, 0 }, 150 { "pj", "elf_pj", "pj", 2, EM_PJ, 0, 0 }, 151 { "openrisc", "elf_openrisc", "openrisc", 8, EM_OPENRISC, 0, 0 }, 152 { "arc", "elf_arc_a5", "arc_a5", 6, EM_ARC_A5, 0, 0 }, 153 { "xtensa", "elf_xtensa", "xtensa", 6, EM_XTENSA, 0, 0 }, 154 }; 155 #define nmachines (sizeof (machines) / sizeof (machines[0])) 156 157 158 /* Default callbacks. Mostly they just return the error value. */ 159 static const char *default_object_type_name (int ignore, char *buf, 160 size_t len); 161 static const char *default_reloc_type_name (int ignore, char *buf, size_t len); 162 static bool default_reloc_type_check (int ignore); 163 static bool default_reloc_valid_use (Elf *elf, int ignore); 164 static Elf_Type default_reloc_simple_type (Ebl *ebl, int ignore); 165 static bool default_gotpc_reloc_check (Elf *elf, int ignore); 166 static const char *default_segment_type_name (int ignore, char *buf, 167 size_t len); 168 static const char *default_section_type_name (int ignore, char *buf, 169 size_t len); 170 static const char *default_section_name (int ignore, int ignore2, char *buf, 171 size_t len); 172 static const char *default_machine_flag_name (Elf64_Word *ignore); 173 static bool default_machine_flag_check (Elf64_Word flags); 174 static bool default_machine_section_flag_check (GElf_Xword flags); 175 static const char *default_symbol_type_name (int ignore, char *buf, 176 size_t len); 177 static const char *default_symbol_binding_name (int ignore, char *buf, 178 size_t len); 179 static const char *default_dynamic_tag_name (int64_t ignore, char *buf, 180 size_t len); 181 static bool default_dynamic_tag_check (int64_t ignore); 182 static GElf_Word default_sh_flags_combine (GElf_Word flags1, GElf_Word flags2); 183 static const char *default_osabi_name (int ignore, char *buf, size_t len); 184 static void default_destr (struct ebl *ignore); 185 static const char *default_core_note_type_name (uint32_t, char *buf, 186 size_t len); 187 static const char *default_object_note_type_name (uint32_t, char *buf, 188 size_t len); 189 static int default_core_note (GElf_Word n_type, GElf_Word descsz, 190 GElf_Word *regs_offset, size_t *nregloc, 191 const Ebl_Register_Location **reglocs, 192 size_t *nitems, const Ebl_Core_Item **); 193 static int default_auxv_info (GElf_Xword a_type, 194 const char **name, const char **format); 195 static bool default_object_note (const char *name, uint32_t type, 196 uint32_t descsz, const char *desc); 197 static bool default_debugscn_p (const char *name); 198 static bool default_copy_reloc_p (int reloc); 199 /* ANDROID_CHANGE_BEGIN */ 200 #ifndef __APPLE__ 201 static bool default_none_reloc_p (int reloc); 202 static bool default_relative_reloc_p (int reloc); 203 #else 204 #define default_none_reloc_p default_copy_reloc_p 205 #define default_relative_reloc_p default_copy_reloc_p 206 #endif 207 /* ANDROID_CHANGE_END */ 208 static bool default_check_special_symbol (Elf *elf, GElf_Ehdr *ehdr, 209 const GElf_Sym *sym, 210 const char *name, 211 const GElf_Shdr *destshdr); 212 static bool default_check_special_section (Ebl *, int, 213 const GElf_Shdr *, const char *); 214 static bool default_bss_plt_p (Elf *elf, GElf_Ehdr *ehdr); 215 static int default_return_value_location (Dwarf_Die *functypedie, 216 const Dwarf_Op **locops); 217 static ssize_t default_register_info (Ebl *ebl, 218 int regno, char *name, size_t namelen, 219 const char **prefix, 220 const char **setname, 221 int *bits, int *type); 222 static int default_syscall_abi (Ebl *ebl, int *sp, int *pc, 223 int *callno, int args[6]); 224 static bool default_check_object_attribute (Ebl *ebl, const char *vendor, 225 int tag, uint64_t value, 226 const char **tag_name, 227 const char **value_name); 228 229 230 static void 231 fill_defaults (Ebl *result) 232 { 233 result->object_type_name = default_object_type_name; 234 result->reloc_type_name = default_reloc_type_name; 235 result->reloc_type_check = default_reloc_type_check; 236 result->reloc_valid_use = default_reloc_valid_use; 237 result->reloc_simple_type = default_reloc_simple_type; 238 result->gotpc_reloc_check = default_gotpc_reloc_check; 239 result->segment_type_name = default_segment_type_name; 240 result->section_type_name = default_section_type_name; 241 result->section_name = default_section_name; 242 result->machine_flag_name = default_machine_flag_name; 243 result->machine_flag_check = default_machine_flag_check; 244 result->machine_section_flag_check = default_machine_section_flag_check; 245 result->check_special_section = default_check_special_section; 246 result->symbol_type_name = default_symbol_type_name; 247 result->symbol_binding_name = default_symbol_binding_name; 248 result->dynamic_tag_name = default_dynamic_tag_name; 249 result->dynamic_tag_check = default_dynamic_tag_check; 250 result->sh_flags_combine = default_sh_flags_combine; 251 result->osabi_name = default_osabi_name; 252 result->core_note_type_name = default_core_note_type_name; 253 result->object_note_type_name = default_object_note_type_name; 254 result->core_note = default_core_note; 255 result->auxv_info = default_auxv_info; 256 result->object_note = default_object_note; 257 result->debugscn_p = default_debugscn_p; 258 result->copy_reloc_p = default_copy_reloc_p; 259 result->none_reloc_p = default_none_reloc_p; 260 result->relative_reloc_p = default_relative_reloc_p; 261 result->check_special_symbol = default_check_special_symbol; 262 result->bss_plt_p = default_bss_plt_p; 263 result->return_value_location = default_return_value_location; 264 result->register_info = default_register_info; 265 result->syscall_abi = default_syscall_abi; 266 result->check_object_attribute = default_check_object_attribute; 267 result->disasm = NULL; 268 result->destr = default_destr; 269 result->sysvhash_entrysize = sizeof (Elf32_Word); 270 } 271 272 273 /* Find an appropriate backend for the file associated with ELF. */ 274 static Ebl * 275 openbackend (elf, emulation, machine) 276 Elf *elf; 277 const char *emulation; 278 GElf_Half machine; 279 { 280 Ebl *result; 281 size_t cnt; 282 283 /* First allocate the data structure for the result. We do this 284 here since this assures that the structure is always large 285 enough. */ 286 result = (Ebl *) calloc (1, sizeof (Ebl)); 287 if (result == NULL) 288 { 289 // XXX uncomment 290 // __libebl_seterror (ELF_E_NOMEM); 291 return NULL; 292 } 293 294 /* Fill in the default callbacks. The initializer for the machine 295 specific module can overwrite the values. */ 296 fill_defaults (result); 297 298 /* XXX Currently all we do is to look at 'e_machine' value in the 299 ELF header. With an internal mapping table from EM_* value to 300 DSO name we try to load the appropriate module to handle this 301 binary type. 302 303 Multiple modules for the same machine type are possible and they 304 will be tried in sequence. The lookup process will only stop 305 when a module which can handle the machine type is found or all 306 available matching modules are tried. */ 307 for (cnt = 0; cnt < nmachines; ++cnt) 308 if ((emulation != NULL && strcmp (emulation, machines[cnt].emulation) == 0) 309 || (emulation == NULL && machines[cnt].em == machine)) 310 { 311 /* Well, we know the emulation name now. */ 312 result->emulation = machines[cnt].emulation; 313 314 /* We access some data structures directly. Make sure the 32 and 315 64 bit variants are laid out the same. */ 316 assert (offsetof (Elf32_Ehdr, e_machine) 317 == offsetof (Elf64_Ehdr, e_machine)); 318 assert (sizeof (((Elf32_Ehdr *) 0)->e_machine) 319 == sizeof (((Elf64_Ehdr *) 0)->e_machine)); 320 assert (offsetof (Elf, state.elf32.ehdr) 321 == offsetof (Elf, state.elf64.ehdr)); 322 323 /* Prefer taking the information from the ELF file. */ 324 if (elf == NULL) 325 { 326 result->machine = machines[cnt].em; 327 result->class = machines[cnt].class; 328 result->data = machines[cnt].data; 329 } 330 else 331 { 332 result->machine = elf->state.elf32.ehdr->e_machine; 333 result->class = elf->state.elf32.ehdr->e_ident[EI_CLASS]; 334 result->data = elf->state.elf32.ehdr->e_ident[EI_DATA]; 335 } 336 337 #ifndef LIBEBL_SUBDIR 338 # define LIBEBL_SUBDIR PACKAGE 339 #endif 340 #define ORIGINDIR "$ORIGIN/../$LIB/" LIBEBL_SUBDIR "/" 341 342 /* Give it a try. At least the machine type matches. First 343 try to load the module. */ 344 char dsoname[100]; 345 strcpy (stpcpy (stpcpy (dsoname, ORIGINDIR "libebl_"), 346 machines[cnt].dsoname), 347 ".so"); 348 349 void *h = dlopen (dsoname, RTLD_LAZY); 350 if (h == NULL) 351 { 352 strcpy (stpcpy (stpcpy (dsoname, "libebl_"), 353 machines[cnt].dsoname), 354 ".so"); 355 h = dlopen (dsoname, RTLD_LAZY); 356 } 357 358 /* Try without an explicit path. */ 359 if (h != NULL) 360 { 361 /* We managed to load the object. Now see whether the 362 initialization function likes our file. */ 363 static const char version[] = MODVERSION; 364 const char *modversion; 365 ebl_bhinit_t initp; 366 char symname[machines[cnt].prefix_len + sizeof "_init"]; 367 368 strcpy (mempcpy (symname, machines[cnt].prefix, 369 machines[cnt].prefix_len), "_init"); 370 371 initp = (ebl_bhinit_t) dlsym (h, symname); 372 if (initp != NULL 373 && (modversion = initp (elf, machine, result, sizeof (Ebl))) 374 && strcmp (version, modversion) == 0) 375 { 376 /* We found a module to handle our file. */ 377 result->dlhandle = h; 378 result->elf = elf; 379 380 /* A few entries are mandatory. */ 381 assert (result->name != NULL); 382 assert (result->destr != NULL); 383 384 return result; 385 } 386 387 /* Not the module we need. */ 388 (void) dlclose (h); 389 } 390 391 /* We cannot find a DSO but the emulation/machine ID matches. 392 Return that information. */ 393 result->dlhandle = NULL; 394 result->elf = elf; 395 result->name = machines[cnt].prefix; 396 fill_defaults (result); 397 398 return result; 399 } 400 401 /* Nothing matched. We use only the default callbacks. */ 402 result->dlhandle = NULL; 403 result->elf = elf; 404 result->emulation = "<unknown>"; 405 result->name = "<unknown>"; 406 fill_defaults (result); 407 408 return result; 409 } 410 411 412 /* Find an appropriate backend for the file associated with ELF. */ 413 Ebl * 414 ebl_openbackend (elf) 415 Elf *elf; 416 { 417 GElf_Ehdr ehdr_mem; 418 GElf_Ehdr *ehdr; 419 420 /* Get the ELF header of the object. */ 421 ehdr = gelf_getehdr (elf, &ehdr_mem); 422 if (ehdr == NULL) 423 { 424 // XXX uncomment 425 // __libebl_seterror (elf_errno ()); 426 return NULL; 427 } 428 429 return openbackend (elf, NULL, ehdr->e_machine); 430 } 431 432 433 /* Find backend without underlying ELF file. */ 434 Ebl * 435 ebl_openbackend_machine (machine) 436 GElf_Half machine; 437 { 438 return openbackend (NULL, NULL, machine); 439 } 440 441 442 /* Find backend with given emulation name. */ 443 Ebl * 444 ebl_openbackend_emulation (const char *emulation) 445 { 446 return openbackend (NULL, emulation, EM_NONE); 447 } 448 449 450 /* Default callbacks. Mostly they just return the error value. */ 451 static const char * 452 default_object_type_name (int ignore __attribute__ ((unused)), 453 char *buf __attribute__ ((unused)), 454 size_t len __attribute__ ((unused))) 455 { 456 return NULL; 457 } 458 459 static const char * 460 default_reloc_type_name (int ignore __attribute__ ((unused)), 461 char *buf __attribute__ ((unused)), 462 size_t len __attribute__ ((unused))) 463 { 464 return NULL; 465 } 466 467 static bool 468 default_reloc_type_check (int ignore __attribute__ ((unused))) 469 { 470 return false; 471 } 472 473 static bool 474 default_reloc_valid_use (Elf *elf __attribute__ ((unused)), 475 int ignore __attribute__ ((unused))) 476 { 477 return false; 478 } 479 480 static Elf_Type 481 default_reloc_simple_type (Ebl *eh __attribute__ ((unused)), 482 int ignore __attribute__ ((unused))) 483 { 484 return ELF_T_NUM; 485 } 486 487 static bool 488 default_gotpc_reloc_check (Elf *elf __attribute__ ((unused)), 489 int ignore __attribute__ ((unused))) 490 { 491 return false; 492 } 493 494 static const char * 495 default_segment_type_name (int ignore __attribute__ ((unused)), 496 char *buf __attribute__ ((unused)), 497 size_t len __attribute__ ((unused))) 498 { 499 return NULL; 500 } 501 502 static const char * 503 default_section_type_name (int ignore __attribute__ ((unused)), 504 char *buf __attribute__ ((unused)), 505 size_t len __attribute__ ((unused))) 506 { 507 return NULL; 508 } 509 510 static const char * 511 default_section_name (int ignore __attribute__ ((unused)), 512 int ignore2 __attribute__ ((unused)), 513 char *buf __attribute__ ((unused)), 514 size_t len __attribute__ ((unused))) 515 { 516 return NULL; 517 } 518 519 static const char * 520 default_machine_flag_name (Elf64_Word *ignore __attribute__ ((unused))) 521 { 522 return NULL; 523 } 524 525 static bool 526 default_machine_flag_check (Elf64_Word flags __attribute__ ((unused))) 527 { 528 return flags == 0; 529 } 530 531 static bool 532 default_machine_section_flag_check (GElf_Xword flags) 533 { 534 return flags == 0; 535 } 536 537 static bool 538 default_check_special_section (Ebl *ebl __attribute__ ((unused)), 539 int ndx __attribute__ ((unused)), 540 const GElf_Shdr *shdr __attribute__ ((unused)), 541 const char *sname __attribute__ ((unused))) 542 { 543 return false; 544 } 545 546 static const char * 547 default_symbol_type_name (int ignore __attribute__ ((unused)), 548 char *buf __attribute__ ((unused)), 549 size_t len __attribute__ ((unused))) 550 { 551 return NULL; 552 } 553 554 static const char * 555 default_symbol_binding_name (int ignore __attribute__ ((unused)), 556 char *buf __attribute__ ((unused)), 557 size_t len __attribute__ ((unused))) 558 { 559 return NULL; 560 } 561 562 static const char * 563 default_dynamic_tag_name (int64_t ignore __attribute__ ((unused)), 564 char *buf __attribute__ ((unused)), 565 size_t len __attribute__ ((unused))) 566 { 567 return NULL; 568 } 569 570 static bool 571 default_dynamic_tag_check (int64_t ignore __attribute__ ((unused))) 572 { 573 return false; 574 } 575 576 static GElf_Word 577 default_sh_flags_combine (GElf_Word flags1, GElf_Word flags2) 578 { 579 return SH_FLAGS_COMBINE (flags1, flags2); 580 } 581 582 static void 583 default_destr (struct ebl *ignore __attribute__ ((unused))) 584 { 585 } 586 587 static const char * 588 default_osabi_name (int ignore __attribute__ ((unused)), 589 char *buf __attribute__ ((unused)), 590 size_t len __attribute__ ((unused))) 591 { 592 return NULL; 593 } 594 595 static const char * 596 default_core_note_type_name (uint32_t ignore __attribute__ ((unused)), 597 char *buf __attribute__ ((unused)), 598 size_t len __attribute__ ((unused))) 599 { 600 return NULL; 601 } 602 603 static int 604 default_auxv_info (GElf_Xword a_type __attribute__ ((unused)), 605 const char **name __attribute__ ((unused)), 606 const char **format __attribute__ ((unused))) 607 { 608 return 0; 609 } 610 611 static int 612 default_core_note (GElf_Word n_type __attribute__ ((unused)), 613 GElf_Word descsz __attribute__ ((unused)), 614 GElf_Word *ro __attribute__ ((unused)), 615 size_t *nregloc __attribute__ ((unused)), 616 const Ebl_Register_Location **reglocs 617 __attribute__ ((unused)), 618 size_t *nitems __attribute__ ((unused)), 619 const Ebl_Core_Item **items __attribute__ ((unused))) 620 { 621 return 0; 622 } 623 624 static const char * 625 default_object_note_type_name (uint32_t ignore __attribute__ ((unused)), 626 char *buf __attribute__ ((unused)), 627 size_t len __attribute__ ((unused))) 628 { 629 return NULL; 630 } 631 632 static bool 633 default_object_note (const char *name __attribute__ ((unused)), 634 uint32_t type __attribute__ ((unused)), 635 uint32_t descsz __attribute__ ((unused)), 636 const char *desc __attribute__ ((unused))) 637 { 638 return NULL; 639 } 640 641 static bool 642 default_debugscn_p (const char *name) 643 { 644 /* We know by default only about the DWARF debug sections which have 645 fixed names. */ 646 static const char *dwarf_scn_names[] = 647 { 648 /* DWARF 1 */ 649 ".debug", 650 ".line", 651 /* GNU DWARF 1 extensions */ 652 ".debug_srcinfo", 653 ".debug_sfnames", 654 /* DWARF 1.1 and DWARF 2 */ 655 ".debug_aranges", 656 ".debug_pubnames", 657 /* DWARF 2 */ 658 ".debug_info", 659 ".debug_abbrev", 660 ".debug_line", 661 ".debug_frame", 662 ".debug_str", 663 ".debug_loc", 664 ".debug_macinfo", 665 /* DWARF 3 */ 666 ".debug_ranges", 667 /* SGI/MIPS DWARF 2 extensions */ 668 ".debug_weaknames", 669 ".debug_funcnames", 670 ".debug_typenames", 671 ".debug_varnames" 672 }; 673 const size_t ndwarf_scn_names = (sizeof (dwarf_scn_names) 674 / sizeof (dwarf_scn_names[0])); 675 for (size_t cnt = 0; cnt < ndwarf_scn_names; ++cnt) 676 if (strcmp (name, dwarf_scn_names[cnt]) == 0) 677 return true; 678 679 return false; 680 } 681 682 static bool 683 default_copy_reloc_p (int reloc __attribute__ ((unused))) 684 { 685 return false; 686 } 687 /* ANDROID_CHANGE_BEGIN */ 688 #ifndef __APPLE__ 689 strong_alias (default_copy_reloc_p, default_none_reloc_p) 690 strong_alias (default_copy_reloc_p, default_relative_reloc_p) 691 #endif 692 /* ANDROID_CHANGE_END */ 693 694 static bool 695 default_check_special_symbol (Elf *elf __attribute__ ((unused)), 696 GElf_Ehdr *ehdr __attribute__ ((unused)), 697 const GElf_Sym *sym __attribute__ ((unused)), 698 const char *name __attribute__ ((unused)), 699 const GElf_Shdr *destshdr __attribute__ ((unused))) 700 { 701 return false; 702 } 703 704 static bool 705 default_bss_plt_p (Elf *elf __attribute__ ((unused)), 706 GElf_Ehdr *ehdr __attribute__ ((unused))) 707 { 708 return false; 709 } 710 711 static int 712 default_return_value_location (Dwarf_Die *functypedie __attribute__ ((unused)), 713 const Dwarf_Op **locops __attribute__ ((unused))) 714 { 715 return -2; 716 } 717 718 static ssize_t 719 default_register_info (Ebl *ebl __attribute__ ((unused)), 720 int regno, char *name, size_t namelen, 721 const char **prefix, 722 const char **setname, 723 int *bits, int *type) 724 { 725 if (name == NULL) 726 return 0; 727 728 *setname = "???"; 729 *prefix = ""; 730 *bits = -1; 731 *type = DW_ATE_void; 732 return snprintf (name, namelen, "reg%d", regno); 733 } 734 735 static int 736 default_syscall_abi (Ebl *ebl __attribute__ ((unused)), 737 int *sp, int *pc, int *callno, int args[6]) 738 { 739 *sp = *pc = *callno = -1; 740 args[0] = -1; 741 args[1] = -1; 742 args[2] = -1; 743 args[3] = -1; 744 args[4] = -1; 745 args[5] = -1; 746 return -1; 747 } 748 749 static bool 750 default_check_object_attribute (Ebl *ebl __attribute__ ((unused)), 751 const char *vendor __attribute__ ((unused)), 752 int tag __attribute__ ((unused)), 753 uint64_t value __attribute__ ((unused)), 754 const char **tag_name, const char **value_name) 755 { 756 *tag_name = NULL; 757 *value_name = NULL; 758 return false; 759 } 760
