| 1 | /* Generic symbol-table support for the BFD library. |
| 2 | Copyright (C) 1990-2020 Free Software Foundation, Inc. |
| 3 | Written by Cygnus Support. |
| 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 3 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., 51 Franklin Street - Fifth Floor, Boston, |
| 20 | MA 02110-1301, USA. */ |
| 21 | |
| 22 | /* |
| 23 | SECTION |
| 24 | Symbols |
| 25 | |
| 26 | BFD tries to maintain as much symbol information as it can when |
| 27 | it moves information from file to file. BFD passes information |
| 28 | to applications though the <<asymbol>> structure. When the |
| 29 | application requests the symbol table, BFD reads the table in |
| 30 | the native form and translates parts of it into the internal |
| 31 | format. To maintain more than the information passed to |
| 32 | applications, some targets keep some information ``behind the |
| 33 | scenes'' in a structure only the particular back end knows |
| 34 | about. For example, the coff back end keeps the original |
| 35 | symbol table structure as well as the canonical structure when |
| 36 | a BFD is read in. On output, the coff back end can reconstruct |
| 37 | the output symbol table so that no information is lost, even |
| 38 | information unique to coff which BFD doesn't know or |
| 39 | understand. If a coff symbol table were read, but were written |
| 40 | through an a.out back end, all the coff specific information |
| 41 | would be lost. The symbol table of a BFD |
| 42 | is not necessarily read in until a canonicalize request is |
| 43 | made. Then the BFD back end fills in a table provided by the |
| 44 | application with pointers to the canonical information. To |
| 45 | output symbols, the application provides BFD with a table of |
| 46 | pointers to pointers to <<asymbol>>s. This allows applications |
| 47 | like the linker to output a symbol as it was read, since the ``behind |
| 48 | the scenes'' information will be still available. |
| 49 | @menu |
| 50 | @* Reading Symbols:: |
| 51 | @* Writing Symbols:: |
| 52 | @* Mini Symbols:: |
| 53 | @* typedef asymbol:: |
| 54 | @* symbol handling functions:: |
| 55 | @end menu |
| 56 | |
| 57 | INODE |
| 58 | Reading Symbols, Writing Symbols, Symbols, Symbols |
| 59 | SUBSECTION |
| 60 | Reading symbols |
| 61 | |
| 62 | There are two stages to reading a symbol table from a BFD: |
| 63 | allocating storage, and the actual reading process. This is an |
| 64 | excerpt from an application which reads the symbol table: |
| 65 | |
| 66 | | long storage_needed; |
| 67 | | asymbol **symbol_table; |
| 68 | | long number_of_symbols; |
| 69 | | long i; |
| 70 | | |
| 71 | | storage_needed = bfd_get_symtab_upper_bound (abfd); |
| 72 | | |
| 73 | | if (storage_needed < 0) |
| 74 | | FAIL |
| 75 | | |
| 76 | | if (storage_needed == 0) |
| 77 | | return; |
| 78 | | |
| 79 | | symbol_table = xmalloc (storage_needed); |
| 80 | | ... |
| 81 | | number_of_symbols = |
| 82 | | bfd_canonicalize_symtab (abfd, symbol_table); |
| 83 | | |
| 84 | | if (number_of_symbols < 0) |
| 85 | | FAIL |
| 86 | | |
| 87 | | for (i = 0; i < number_of_symbols; i++) |
| 88 | | process_symbol (symbol_table[i]); |
| 89 | |
| 90 | All storage for the symbols themselves is in an objalloc |
| 91 | connected to the BFD; it is freed when the BFD is closed. |
| 92 | |
| 93 | INODE |
| 94 | Writing Symbols, Mini Symbols, Reading Symbols, Symbols |
| 95 | SUBSECTION |
| 96 | Writing symbols |
| 97 | |
| 98 | Writing of a symbol table is automatic when a BFD open for |
| 99 | writing is closed. The application attaches a vector of |
| 100 | pointers to pointers to symbols to the BFD being written, and |
| 101 | fills in the symbol count. The close and cleanup code reads |
| 102 | through the table provided and performs all the necessary |
| 103 | operations. The BFD output code must always be provided with an |
| 104 | ``owned'' symbol: one which has come from another BFD, or one |
| 105 | which has been created using <<bfd_make_empty_symbol>>. Here is an |
| 106 | example showing the creation of a symbol table with only one element: |
| 107 | |
| 108 | | #include "sysdep.h" |
| 109 | | #include "bfd.h" |
| 110 | | int main (void) |
| 111 | | { |
| 112 | | bfd *abfd; |
| 113 | | asymbol *ptrs[2]; |
| 114 | | asymbol *new; |
| 115 | | |
| 116 | | abfd = bfd_openw ("foo","a.out-sunos-big"); |
| 117 | | bfd_set_format (abfd, bfd_object); |
| 118 | | new = bfd_make_empty_symbol (abfd); |
| 119 | | new->name = "dummy_symbol"; |
| 120 | | new->section = bfd_make_section_old_way (abfd, ".text"); |
| 121 | | new->flags = BSF_GLOBAL; |
| 122 | | new->value = 0x12345; |
| 123 | | |
| 124 | | ptrs[0] = new; |
| 125 | | ptrs[1] = 0; |
| 126 | | |
| 127 | | bfd_set_symtab (abfd, ptrs, 1); |
| 128 | | bfd_close (abfd); |
| 129 | | return 0; |
| 130 | | } |
| 131 | | |
| 132 | | ./makesym |
| 133 | | nm foo |
| 134 | | 00012345 A dummy_symbol |
| 135 | |
| 136 | Many formats cannot represent arbitrary symbol information; for |
| 137 | instance, the <<a.out>> object format does not allow an |
| 138 | arbitrary number of sections. A symbol pointing to a section |
| 139 | which is not one of <<.text>>, <<.data>> or <<.bss>> cannot |
| 140 | be described. |
| 141 | |
| 142 | INODE |
| 143 | Mini Symbols, typedef asymbol, Writing Symbols, Symbols |
| 144 | SUBSECTION |
| 145 | Mini Symbols |
| 146 | |
| 147 | Mini symbols provide read-only access to the symbol table. |
| 148 | They use less memory space, but require more time to access. |
| 149 | They can be useful for tools like nm or objdump, which may |
| 150 | have to handle symbol tables of extremely large executables. |
| 151 | |
| 152 | The <<bfd_read_minisymbols>> function will read the symbols |
| 153 | into memory in an internal form. It will return a <<void *>> |
| 154 | pointer to a block of memory, a symbol count, and the size of |
| 155 | each symbol. The pointer is allocated using <<malloc>>, and |
| 156 | should be freed by the caller when it is no longer needed. |
| 157 | |
| 158 | The function <<bfd_minisymbol_to_symbol>> will take a pointer |
| 159 | to a minisymbol, and a pointer to a structure returned by |
| 160 | <<bfd_make_empty_symbol>>, and return a <<asymbol>> structure. |
| 161 | The return value may or may not be the same as the value from |
| 162 | <<bfd_make_empty_symbol>> which was passed in. |
| 163 | |
| 164 | */ |
| 165 | |
| 166 | /* |
| 167 | DOCDD |
| 168 | INODE |
| 169 | typedef asymbol, symbol handling functions, Mini Symbols, Symbols |
| 170 | |
| 171 | */ |
| 172 | /* |
| 173 | SUBSECTION |
| 174 | typedef asymbol |
| 175 | |
| 176 | An <<asymbol>> has the form: |
| 177 | |
| 178 | */ |
| 179 | |
| 180 | /* |
| 181 | CODE_FRAGMENT |
| 182 | |
| 183 | . |
| 184 | .typedef struct bfd_symbol |
| 185 | .{ |
| 186 | . {* A pointer to the BFD which owns the symbol. This information |
| 187 | . is necessary so that a back end can work out what additional |
| 188 | . information (invisible to the application writer) is carried |
| 189 | . with the symbol. |
| 190 | . |
| 191 | . This field is *almost* redundant, since you can use section->owner |
| 192 | . instead, except that some symbols point to the global sections |
| 193 | . bfd_{abs,com,und}_section. This could be fixed by making |
| 194 | . these globals be per-bfd (or per-target-flavor). FIXME. *} |
| 195 | . struct bfd *the_bfd; {* Use bfd_asymbol_bfd(sym) to access this field. *} |
| 196 | . |
| 197 | . {* The text of the symbol. The name is left alone, and not copied; the |
| 198 | . application may not alter it. *} |
| 199 | . const char *name; |
| 200 | . |
| 201 | . {* The value of the symbol. This really should be a union of a |
| 202 | . numeric value with a pointer, since some flags indicate that |
| 203 | . a pointer to another symbol is stored here. *} |
| 204 | . symvalue value; |
| 205 | . |
| 206 | . {* Attributes of a symbol. *} |
| 207 | .#define BSF_NO_FLAGS 0 |
| 208 | . |
| 209 | . {* The symbol has local scope; <<static>> in <<C>>. The value |
| 210 | . is the offset into the section of the data. *} |
| 211 | .#define BSF_LOCAL (1 << 0) |
| 212 | . |
| 213 | . {* The symbol has global scope; initialized data in <<C>>. The |
| 214 | . value is the offset into the section of the data. *} |
| 215 | .#define BSF_GLOBAL (1 << 1) |
| 216 | . |
| 217 | . {* The symbol has global scope and is exported. The value is |
| 218 | . the offset into the section of the data. *} |
| 219 | .#define BSF_EXPORT BSF_GLOBAL {* No real difference. *} |
| 220 | . |
| 221 | . {* A normal C symbol would be one of: |
| 222 | . <<BSF_LOCAL>>, <<BSF_UNDEFINED>> or <<BSF_GLOBAL>>. *} |
| 223 | . |
| 224 | . {* The symbol is a debugging record. The value has an arbitrary |
| 225 | . meaning, unless BSF_DEBUGGING_RELOC is also set. *} |
| 226 | .#define BSF_DEBUGGING (1 << 2) |
| 227 | . |
| 228 | . {* The symbol denotes a function entry point. Used in ELF, |
| 229 | . perhaps others someday. *} |
| 230 | .#define BSF_FUNCTION (1 << 3) |
| 231 | . |
| 232 | . {* Used by the linker. *} |
| 233 | .#define BSF_KEEP (1 << 5) |
| 234 | . |
| 235 | . {* An ELF common symbol. *} |
| 236 | .#define BSF_ELF_COMMON (1 << 6) |
| 237 | . |
| 238 | . {* A weak global symbol, overridable without warnings by |
| 239 | . a regular global symbol of the same name. *} |
| 240 | .#define BSF_WEAK (1 << 7) |
| 241 | . |
| 242 | . {* This symbol was created to point to a section, e.g. ELF's |
| 243 | . STT_SECTION symbols. *} |
| 244 | .#define BSF_SECTION_SYM (1 << 8) |
| 245 | . |
| 246 | . {* The symbol used to be a common symbol, but now it is |
| 247 | . allocated. *} |
| 248 | .#define BSF_OLD_COMMON (1 << 9) |
| 249 | . |
| 250 | . {* In some files the type of a symbol sometimes alters its |
| 251 | . location in an output file - ie in coff a <<ISFCN>> symbol |
| 252 | . which is also <<C_EXT>> symbol appears where it was |
| 253 | . declared and not at the end of a section. This bit is set |
| 254 | . by the target BFD part to convey this information. *} |
| 255 | .#define BSF_NOT_AT_END (1 << 10) |
| 256 | . |
| 257 | . {* Signal that the symbol is the label of constructor section. *} |
| 258 | .#define BSF_CONSTRUCTOR (1 << 11) |
| 259 | . |
| 260 | . {* Signal that the symbol is a warning symbol. The name is a |
| 261 | . warning. The name of the next symbol is the one to warn about; |
| 262 | . if a reference is made to a symbol with the same name as the next |
| 263 | . symbol, a warning is issued by the linker. *} |
| 264 | .#define BSF_WARNING (1 << 12) |
| 265 | . |
| 266 | . {* Signal that the symbol is indirect. This symbol is an indirect |
| 267 | . pointer to the symbol with the same name as the next symbol. *} |
| 268 | .#define BSF_INDIRECT (1 << 13) |
| 269 | . |
| 270 | . {* BSF_FILE marks symbols that contain a file name. This is used |
| 271 | . for ELF STT_FILE symbols. *} |
| 272 | .#define BSF_FILE (1 << 14) |
| 273 | . |
| 274 | . {* Symbol is from dynamic linking information. *} |
| 275 | .#define BSF_DYNAMIC (1 << 15) |
| 276 | . |
| 277 | . {* The symbol denotes a data object. Used in ELF, and perhaps |
| 278 | . others someday. *} |
| 279 | .#define BSF_OBJECT (1 << 16) |
| 280 | . |
| 281 | . {* This symbol is a debugging symbol. The value is the offset |
| 282 | . into the section of the data. BSF_DEBUGGING should be set |
| 283 | . as well. *} |
| 284 | .#define BSF_DEBUGGING_RELOC (1 << 17) |
| 285 | . |
| 286 | . {* This symbol is thread local. Used in ELF. *} |
| 287 | .#define BSF_THREAD_LOCAL (1 << 18) |
| 288 | . |
| 289 | . {* This symbol represents a complex relocation expression, |
| 290 | . with the expression tree serialized in the symbol name. *} |
| 291 | .#define BSF_RELC (1 << 19) |
| 292 | . |
| 293 | . {* This symbol represents a signed complex relocation expression, |
| 294 | . with the expression tree serialized in the symbol name. *} |
| 295 | .#define BSF_SRELC (1 << 20) |
| 296 | . |
| 297 | . {* This symbol was created by bfd_get_synthetic_symtab. *} |
| 298 | .#define BSF_SYNTHETIC (1 << 21) |
| 299 | . |
| 300 | . {* This symbol is an indirect code object. Unrelated to BSF_INDIRECT. |
| 301 | . The dynamic linker will compute the value of this symbol by |
| 302 | . calling the function that it points to. BSF_FUNCTION must |
| 303 | . also be also set. *} |
| 304 | .#define BSF_GNU_INDIRECT_FUNCTION (1 << 22) |
| 305 | . {* This symbol is a globally unique data object. The dynamic linker |
| 306 | . will make sure that in the entire process there is just one symbol |
| 307 | . with this name and type in use. BSF_OBJECT must also be set. *} |
| 308 | .#define BSF_GNU_UNIQUE (1 << 23) |
| 309 | . |
| 310 | . flagword flags; |
| 311 | . |
| 312 | . {* A pointer to the section to which this symbol is |
| 313 | . relative. This will always be non NULL, there are special |
| 314 | . sections for undefined and absolute symbols. *} |
| 315 | . struct bfd_section *section; |
| 316 | . |
| 317 | . {* Back end special data. *} |
| 318 | . union |
| 319 | . { |
| 320 | . void *p; |
| 321 | . bfd_vma i; |
| 322 | . } |
| 323 | . udata; |
| 324 | .} |
| 325 | .asymbol; |
| 326 | . |
| 327 | */ |
| 328 | |
| 329 | #include "sysdep.h" |
| 330 | #include "bfd.h" |
| 331 | #include "libbfd.h" |
| 332 | #include "safe-ctype.h" |
| 333 | #include "bfdlink.h" |
| 334 | #include "aout/stab_gnu.h" |
| 335 | |
| 336 | /* |
| 337 | DOCDD |
| 338 | INODE |
| 339 | symbol handling functions, , typedef asymbol, Symbols |
| 340 | SUBSECTION |
| 341 | Symbol handling functions |
| 342 | */ |
| 343 | |
| 344 | /* |
| 345 | FUNCTION |
| 346 | bfd_get_symtab_upper_bound |
| 347 | |
| 348 | DESCRIPTION |
| 349 | Return the number of bytes required to store a vector of pointers |
| 350 | to <<asymbols>> for all the symbols in the BFD @var{abfd}, |
| 351 | including a terminal NULL pointer. If there are no symbols in |
| 352 | the BFD, then return 0. If an error occurs, return -1. |
| 353 | |
| 354 | .#define bfd_get_symtab_upper_bound(abfd) \ |
| 355 | . BFD_SEND (abfd, _bfd_get_symtab_upper_bound, (abfd)) |
| 356 | . |
| 357 | */ |
| 358 | |
| 359 | /* |
| 360 | FUNCTION |
| 361 | bfd_is_local_label |
| 362 | |
| 363 | SYNOPSIS |
| 364 | bfd_boolean bfd_is_local_label (bfd *abfd, asymbol *sym); |
| 365 | |
| 366 | DESCRIPTION |
| 367 | Return TRUE if the given symbol @var{sym} in the BFD @var{abfd} is |
| 368 | a compiler generated local label, else return FALSE. |
| 369 | */ |
| 370 | |
| 371 | bfd_boolean |
| 372 | bfd_is_local_label (bfd *abfd, asymbol *sym) |
| 373 | { |
| 374 | /* The BSF_SECTION_SYM check is needed for IA-64, where every label that |
| 375 | starts with '.' is local. This would accidentally catch section names |
| 376 | if we didn't reject them here. */ |
| 377 | if ((sym->flags & (BSF_GLOBAL | BSF_WEAK | BSF_FILE | BSF_SECTION_SYM)) != 0) |
| 378 | return FALSE; |
| 379 | if (sym->name == NULL) |
| 380 | return FALSE; |
| 381 | return bfd_is_local_label_name (abfd, sym->name); |
| 382 | } |
| 383 | |
| 384 | /* |
| 385 | FUNCTION |
| 386 | bfd_is_local_label_name |
| 387 | |
| 388 | SYNOPSIS |
| 389 | bfd_boolean bfd_is_local_label_name (bfd *abfd, const char *name); |
| 390 | |
| 391 | DESCRIPTION |
| 392 | Return TRUE if a symbol with the name @var{name} in the BFD |
| 393 | @var{abfd} is a compiler generated local label, else return |
| 394 | FALSE. This just checks whether the name has the form of a |
| 395 | local label. |
| 396 | |
| 397 | .#define bfd_is_local_label_name(abfd, name) \ |
| 398 | . BFD_SEND (abfd, _bfd_is_local_label_name, (abfd, name)) |
| 399 | . |
| 400 | */ |
| 401 | |
| 402 | /* |
| 403 | FUNCTION |
| 404 | bfd_is_target_special_symbol |
| 405 | |
| 406 | SYNOPSIS |
| 407 | bfd_boolean bfd_is_target_special_symbol (bfd *abfd, asymbol *sym); |
| 408 | |
| 409 | DESCRIPTION |
| 410 | Return TRUE iff a symbol @var{sym} in the BFD @var{abfd} is something |
| 411 | special to the particular target represented by the BFD. Such symbols |
| 412 | should normally not be mentioned to the user. |
| 413 | |
| 414 | .#define bfd_is_target_special_symbol(abfd, sym) \ |
| 415 | . BFD_SEND (abfd, _bfd_is_target_special_symbol, (abfd, sym)) |
| 416 | . |
| 417 | */ |
| 418 | |
| 419 | /* |
| 420 | FUNCTION |
| 421 | bfd_canonicalize_symtab |
| 422 | |
| 423 | DESCRIPTION |
| 424 | Read the symbols from the BFD @var{abfd}, and fills in |
| 425 | the vector @var{location} with pointers to the symbols and |
| 426 | a trailing NULL. |
| 427 | Return the actual number of symbol pointers, not |
| 428 | including the NULL. |
| 429 | |
| 430 | .#define bfd_canonicalize_symtab(abfd, location) \ |
| 431 | . BFD_SEND (abfd, _bfd_canonicalize_symtab, (abfd, location)) |
| 432 | . |
| 433 | */ |
| 434 | |
| 435 | /* |
| 436 | FUNCTION |
| 437 | bfd_set_symtab |
| 438 | |
| 439 | SYNOPSIS |
| 440 | bfd_boolean bfd_set_symtab |
| 441 | (bfd *abfd, asymbol **location, unsigned int count); |
| 442 | |
| 443 | DESCRIPTION |
| 444 | Arrange that when the output BFD @var{abfd} is closed, |
| 445 | the table @var{location} of @var{count} pointers to symbols |
| 446 | will be written. |
| 447 | */ |
| 448 | |
| 449 | bfd_boolean |
| 450 | bfd_set_symtab (bfd *abfd, asymbol **location, unsigned int symcount) |
| 451 | { |
| 452 | if (abfd->format != bfd_object || bfd_read_p (abfd)) |
| 453 | { |
| 454 | bfd_set_error (bfd_error_invalid_operation); |
| 455 | return FALSE; |
| 456 | } |
| 457 | |
| 458 | abfd->outsymbols = location; |
| 459 | abfd->symcount = symcount; |
| 460 | return TRUE; |
| 461 | } |
| 462 | |
| 463 | /* |
| 464 | FUNCTION |
| 465 | bfd_print_symbol_vandf |
| 466 | |
| 467 | SYNOPSIS |
| 468 | void bfd_print_symbol_vandf (bfd *abfd, void *file, asymbol *symbol); |
| 469 | |
| 470 | DESCRIPTION |
| 471 | Print the value and flags of the @var{symbol} supplied to the |
| 472 | stream @var{file}. |
| 473 | */ |
| 474 | void |
| 475 | bfd_print_symbol_vandf (bfd *abfd, void *arg, asymbol *symbol) |
| 476 | { |
| 477 | FILE *file = (FILE *) arg; |
| 478 | |
| 479 | flagword type = symbol->flags; |
| 480 | |
| 481 | if (symbol->section != NULL) |
| 482 | bfd_fprintf_vma (abfd, file, symbol->value + symbol->section->vma); |
| 483 | else |
| 484 | bfd_fprintf_vma (abfd, file, symbol->value); |
| 485 | |
| 486 | /* This presumes that a symbol can not be both BSF_DEBUGGING and |
| 487 | BSF_DYNAMIC, nor more than one of BSF_FUNCTION, BSF_FILE, and |
| 488 | BSF_OBJECT. */ |
| 489 | fprintf (file, " %c%c%c%c%c%c%c", |
| 490 | ((type & BSF_LOCAL) |
| 491 | ? (type & BSF_GLOBAL) ? '!' : 'l' |
| 492 | : (type & BSF_GLOBAL) ? 'g' |
| 493 | : (type & BSF_GNU_UNIQUE) ? 'u' : ' '), |
| 494 | (type & BSF_WEAK) ? 'w' : ' ', |
| 495 | (type & BSF_CONSTRUCTOR) ? 'C' : ' ', |
| 496 | (type & BSF_WARNING) ? 'W' : ' ', |
| 497 | (type & BSF_INDIRECT) ? 'I' : (type & BSF_GNU_INDIRECT_FUNCTION) ? 'i' : ' ', |
| 498 | (type & BSF_DEBUGGING) ? 'd' : (type & BSF_DYNAMIC) ? 'D' : ' ', |
| 499 | ((type & BSF_FUNCTION) |
| 500 | ? 'F' |
| 501 | : ((type & BSF_FILE) |
| 502 | ? 'f' |
| 503 | : ((type & BSF_OBJECT) ? 'O' : ' ')))); |
| 504 | } |
| 505 | |
| 506 | /* |
| 507 | FUNCTION |
| 508 | bfd_make_empty_symbol |
| 509 | |
| 510 | DESCRIPTION |
| 511 | Create a new <<asymbol>> structure for the BFD @var{abfd} |
| 512 | and return a pointer to it. |
| 513 | |
| 514 | This routine is necessary because each back end has private |
| 515 | information surrounding the <<asymbol>>. Building your own |
| 516 | <<asymbol>> and pointing to it will not create the private |
| 517 | information, and will cause problems later on. |
| 518 | |
| 519 | .#define bfd_make_empty_symbol(abfd) \ |
| 520 | . BFD_SEND (abfd, _bfd_make_empty_symbol, (abfd)) |
| 521 | . |
| 522 | */ |
| 523 | |
| 524 | /* |
| 525 | FUNCTION |
| 526 | _bfd_generic_make_empty_symbol |
| 527 | |
| 528 | SYNOPSIS |
| 529 | asymbol *_bfd_generic_make_empty_symbol (bfd *); |
| 530 | |
| 531 | DESCRIPTION |
| 532 | Create a new <<asymbol>> structure for the BFD @var{abfd} |
| 533 | and return a pointer to it. Used by core file routines, |
| 534 | binary back-end and anywhere else where no private info |
| 535 | is needed. |
| 536 | */ |
| 537 | |
| 538 | asymbol * |
| 539 | _bfd_generic_make_empty_symbol (bfd *abfd) |
| 540 | { |
| 541 | size_t amt = sizeof (asymbol); |
| 542 | asymbol *new_symbol = (asymbol *) bfd_zalloc (abfd, amt); |
| 543 | if (new_symbol) |
| 544 | new_symbol->the_bfd = abfd; |
| 545 | return new_symbol; |
| 546 | } |
| 547 | |
| 548 | /* |
| 549 | FUNCTION |
| 550 | bfd_make_debug_symbol |
| 551 | |
| 552 | DESCRIPTION |
| 553 | Create a new <<asymbol>> structure for the BFD @var{abfd}, |
| 554 | to be used as a debugging symbol. Further details of its use have |
| 555 | yet to be worked out. |
| 556 | |
| 557 | .#define bfd_make_debug_symbol(abfd,ptr,size) \ |
| 558 | . BFD_SEND (abfd, _bfd_make_debug_symbol, (abfd, ptr, size)) |
| 559 | . |
| 560 | */ |
| 561 | |
| 562 | struct section_to_type |
| 563 | { |
| 564 | const char *section; |
| 565 | char type; |
| 566 | }; |
| 567 | |
| 568 | /* Map special section names to POSIX/BSD single-character symbol types. |
| 569 | This table is probably incomplete. It is sorted for convenience of |
| 570 | adding entries. Since it is so short, a linear search is used. */ |
| 571 | static const struct section_to_type stt[] = |
| 572 | { |
| 573 | {".drectve", 'i'}, /* MSVC's .drective section */ |
| 574 | {".edata", 'e'}, /* MSVC's .edata (export) section */ |
| 575 | {".idata", 'i'}, /* MSVC's .idata (import) section */ |
| 576 | {".pdata", 'p'}, /* MSVC's .pdata (stack unwind) section */ |
| 577 | {0, 0} |
| 578 | }; |
| 579 | |
| 580 | /* Return the single-character symbol type corresponding to |
| 581 | section S, or '?' for an unknown COFF section. |
| 582 | |
| 583 | Check for leading strings which match, followed by a number, '.', |
| 584 | or '$' so .idata5 matches the .idata entry. */ |
| 585 | |
| 586 | static char |
| 587 | coff_section_type (const char *s) |
| 588 | { |
| 589 | const struct section_to_type *t; |
| 590 | |
| 591 | for (t = &stt[0]; t->section; t++) |
| 592 | { |
| 593 | size_t len = strlen (t->section); |
| 594 | if (strncmp (s, t->section, len) == 0 |
| 595 | && memchr (".$0123456789", s[len], 13) != 0) |
| 596 | return t->type; |
| 597 | } |
| 598 | |
| 599 | return '?'; |
| 600 | } |
| 601 | |
| 602 | /* Return the single-character symbol type corresponding to section |
| 603 | SECTION, or '?' for an unknown section. This uses section flags to |
| 604 | identify sections. |
| 605 | |
| 606 | FIXME These types are unhandled: e, i, p. If we handled these also, |
| 607 | we could perhaps obsolete coff_section_type. */ |
| 608 | |
| 609 | static char |
| 610 | decode_section_type (const struct bfd_section *section) |
| 611 | { |
| 612 | if (section->flags & SEC_CODE) |
| 613 | return 't'; |
| 614 | if (section->flags & SEC_DATA) |
| 615 | { |
| 616 | if (section->flags & SEC_READONLY) |
| 617 | return 'r'; |
| 618 | else if (section->flags & SEC_SMALL_DATA) |
| 619 | return 'g'; |
| 620 | else |
| 621 | return 'd'; |
| 622 | } |
| 623 | if ((section->flags & SEC_HAS_CONTENTS) == 0) |
| 624 | { |
| 625 | if (section->flags & SEC_SMALL_DATA) |
| 626 | return 's'; |
| 627 | else |
| 628 | return 'b'; |
| 629 | } |
| 630 | if (section->flags & SEC_DEBUGGING) |
| 631 | return 'N'; |
| 632 | if ((section->flags & SEC_HAS_CONTENTS) && (section->flags & SEC_READONLY)) |
| 633 | return 'n'; |
| 634 | |
| 635 | return '?'; |
| 636 | } |
| 637 | |
| 638 | /* |
| 639 | FUNCTION |
| 640 | bfd_decode_symclass |
| 641 | |
| 642 | DESCRIPTION |
| 643 | Return a character corresponding to the symbol |
| 644 | class of @var{symbol}, or '?' for an unknown class. |
| 645 | |
| 646 | SYNOPSIS |
| 647 | int bfd_decode_symclass (asymbol *symbol); |
| 648 | */ |
| 649 | int |
| 650 | bfd_decode_symclass (asymbol *symbol) |
| 651 | { |
| 652 | char c; |
| 653 | |
| 654 | if (symbol->section && bfd_is_com_section (symbol->section)) |
| 655 | { |
| 656 | if (symbol->section == bfd_com_section_ptr) |
| 657 | return 'C'; |
| 658 | else |
| 659 | return 'c'; |
| 660 | } |
| 661 | if (bfd_is_und_section (symbol->section)) |
| 662 | { |
| 663 | if (symbol->flags & BSF_WEAK) |
| 664 | { |
| 665 | /* If weak, determine if it's specifically an object |
| 666 | or non-object weak. */ |
| 667 | if (symbol->flags & BSF_OBJECT) |
| 668 | return 'v'; |
| 669 | else |
| 670 | return 'w'; |
| 671 | } |
| 672 | else |
| 673 | return 'U'; |
| 674 | } |
| 675 | if (bfd_is_ind_section (symbol->section)) |
| 676 | return 'I'; |
| 677 | if (symbol->flags & BSF_GNU_INDIRECT_FUNCTION) |
| 678 | return 'i'; |
| 679 | if (symbol->flags & BSF_WEAK) |
| 680 | { |
| 681 | /* If weak, determine if it's specifically an object |
| 682 | or non-object weak. */ |
| 683 | if (symbol->flags & BSF_OBJECT) |
| 684 | return 'V'; |
| 685 | else |
| 686 | return 'W'; |
| 687 | } |
| 688 | if (symbol->flags & BSF_GNU_UNIQUE) |
| 689 | return 'u'; |
| 690 | if (!(symbol->flags & (BSF_GLOBAL | BSF_LOCAL))) |
| 691 | return '?'; |
| 692 | |
| 693 | if (bfd_is_abs_section (symbol->section)) |
| 694 | c = 'a'; |
| 695 | else if (symbol->section) |
| 696 | { |
| 697 | c = coff_section_type (symbol->section->name); |
| 698 | if (c == '?') |
| 699 | c = decode_section_type (symbol->section); |
| 700 | } |
| 701 | else |
| 702 | return '?'; |
| 703 | if (symbol->flags & BSF_GLOBAL) |
| 704 | c = TOUPPER (c); |
| 705 | return c; |
| 706 | |
| 707 | /* We don't have to handle these cases just yet, but we will soon: |
| 708 | N_SETV: 'v'; |
| 709 | N_SETA: 'l'; |
| 710 | N_SETT: 'x'; |
| 711 | N_SETD: 'z'; |
| 712 | N_SETB: 's'; |
| 713 | N_INDR: 'i'; |
| 714 | */ |
| 715 | } |
| 716 | |
| 717 | /* |
| 718 | FUNCTION |
| 719 | bfd_is_undefined_symclass |
| 720 | |
| 721 | DESCRIPTION |
| 722 | Returns non-zero if the class symbol returned by |
| 723 | bfd_decode_symclass represents an undefined symbol. |
| 724 | Returns zero otherwise. |
| 725 | |
| 726 | SYNOPSIS |
| 727 | bfd_boolean bfd_is_undefined_symclass (int symclass); |
| 728 | */ |
| 729 | |
| 730 | bfd_boolean |
| 731 | bfd_is_undefined_symclass (int symclass) |
| 732 | { |
| 733 | return symclass == 'U' || symclass == 'w' || symclass == 'v'; |
| 734 | } |
| 735 | |
| 736 | /* |
| 737 | FUNCTION |
| 738 | bfd_symbol_info |
| 739 | |
| 740 | DESCRIPTION |
| 741 | Fill in the basic info about symbol that nm needs. |
| 742 | Additional info may be added by the back-ends after |
| 743 | calling this function. |
| 744 | |
| 745 | SYNOPSIS |
| 746 | void bfd_symbol_info (asymbol *symbol, symbol_info *ret); |
| 747 | */ |
| 748 | |
| 749 | void |
| 750 | bfd_symbol_info (asymbol *symbol, symbol_info *ret) |
| 751 | { |
| 752 | ret->type = bfd_decode_symclass (symbol); |
| 753 | |
| 754 | if (bfd_is_undefined_symclass (ret->type)) |
| 755 | ret->value = 0; |
| 756 | else |
| 757 | ret->value = symbol->value + symbol->section->vma; |
| 758 | |
| 759 | ret->name = symbol->name; |
| 760 | } |
| 761 | |
| 762 | /* |
| 763 | FUNCTION |
| 764 | bfd_copy_private_symbol_data |
| 765 | |
| 766 | SYNOPSIS |
| 767 | bfd_boolean bfd_copy_private_symbol_data |
| 768 | (bfd *ibfd, asymbol *isym, bfd *obfd, asymbol *osym); |
| 769 | |
| 770 | DESCRIPTION |
| 771 | Copy private symbol information from @var{isym} in the BFD |
| 772 | @var{ibfd} to the symbol @var{osym} in the BFD @var{obfd}. |
| 773 | Return <<TRUE>> on success, <<FALSE>> on error. Possible error |
| 774 | returns are: |
| 775 | |
| 776 | o <<bfd_error_no_memory>> - |
| 777 | Not enough memory exists to create private data for @var{osec}. |
| 778 | |
| 779 | .#define bfd_copy_private_symbol_data(ibfd, isymbol, obfd, osymbol) \ |
| 780 | . BFD_SEND (obfd, _bfd_copy_private_symbol_data, \ |
| 781 | . (ibfd, isymbol, obfd, osymbol)) |
| 782 | . |
| 783 | */ |
| 784 | |
| 785 | /* The generic version of the function which returns mini symbols. |
| 786 | This is used when the backend does not provide a more efficient |
| 787 | version. It just uses BFD asymbol structures as mini symbols. */ |
| 788 | |
| 789 | long |
| 790 | _bfd_generic_read_minisymbols (bfd *abfd, |
| 791 | bfd_boolean dynamic, |
| 792 | void **minisymsp, |
| 793 | unsigned int *sizep) |
| 794 | { |
| 795 | long storage; |
| 796 | asymbol **syms = NULL; |
| 797 | long symcount; |
| 798 | |
| 799 | if (dynamic) |
| 800 | storage = bfd_get_dynamic_symtab_upper_bound (abfd); |
| 801 | else |
| 802 | storage = bfd_get_symtab_upper_bound (abfd); |
| 803 | if (storage < 0) |
| 804 | goto error_return; |
| 805 | if (storage == 0) |
| 806 | return 0; |
| 807 | |
| 808 | syms = (asymbol **) bfd_malloc (storage); |
| 809 | if (syms == NULL) |
| 810 | goto error_return; |
| 811 | |
| 812 | if (dynamic) |
| 813 | symcount = bfd_canonicalize_dynamic_symtab (abfd, syms); |
| 814 | else |
| 815 | symcount = bfd_canonicalize_symtab (abfd, syms); |
| 816 | if (symcount < 0) |
| 817 | goto error_return; |
| 818 | |
| 819 | if (symcount == 0) |
| 820 | /* We return 0 above when storage is 0. Exit in the same state |
| 821 | here, so as to not complicate callers with having to deal with |
| 822 | freeing memory for zero symcount. */ |
| 823 | free (syms); |
| 824 | else |
| 825 | { |
| 826 | *minisymsp = syms; |
| 827 | *sizep = sizeof (asymbol *); |
| 828 | } |
| 829 | return symcount; |
| 830 | |
| 831 | error_return: |
| 832 | bfd_set_error (bfd_error_no_symbols); |
| 833 | if (syms != NULL) |
| 834 | free (syms); |
| 835 | return -1; |
| 836 | } |
| 837 | |
| 838 | /* The generic version of the function which converts a minisymbol to |
| 839 | an asymbol. We don't worry about the sym argument we are passed; |
| 840 | we just return the asymbol the minisymbol points to. */ |
| 841 | |
| 842 | asymbol * |
| 843 | _bfd_generic_minisymbol_to_symbol (bfd *abfd ATTRIBUTE_UNUSED, |
| 844 | bfd_boolean dynamic ATTRIBUTE_UNUSED, |
| 845 | const void *minisym, |
| 846 | asymbol *sym ATTRIBUTE_UNUSED) |
| 847 | { |
| 848 | return *(asymbol **) minisym; |
| 849 | } |
| 850 | |
| 851 | /* Look through stabs debugging information in .stab and .stabstr |
| 852 | sections to find the source file and line closest to a desired |
| 853 | location. This is used by COFF and ELF targets. It sets *pfound |
| 854 | to TRUE if it finds some information. The *pinfo field is used to |
| 855 | pass cached information in and out of this routine; this first time |
| 856 | the routine is called for a BFD, *pinfo should be NULL. The value |
| 857 | placed in *pinfo should be saved with the BFD, and passed back each |
| 858 | time this function is called. */ |
| 859 | |
| 860 | /* We use a cache by default. */ |
| 861 | |
| 862 | #define ENABLE_CACHING |
| 863 | |
| 864 | /* We keep an array of indexentry structures to record where in the |
| 865 | stabs section we should look to find line number information for a |
| 866 | particular address. */ |
| 867 | |
| 868 | struct indexentry |
| 869 | { |
| 870 | bfd_vma val; |
| 871 | bfd_byte *stab; |
| 872 | bfd_byte *str; |
| 873 | char *directory_name; |
| 874 | char *file_name; |
| 875 | char *function_name; |
| 876 | int idx; |
| 877 | }; |
| 878 | |
| 879 | /* Compare two indexentry structures. This is called via qsort. */ |
| 880 | |
| 881 | static int |
| 882 | cmpindexentry (const void *a, const void *b) |
| 883 | { |
| 884 | const struct indexentry *contestantA = (const struct indexentry *) a; |
| 885 | const struct indexentry *contestantB = (const struct indexentry *) b; |
| 886 | |
| 887 | if (contestantA->val < contestantB->val) |
| 888 | return -1; |
| 889 | if (contestantA->val > contestantB->val) |
| 890 | return 1; |
| 891 | return contestantA->idx - contestantB->idx; |
| 892 | } |
| 893 | |
| 894 | /* A pointer to this structure is stored in *pinfo. */ |
| 895 | |
| 896 | struct stab_find_info |
| 897 | { |
| 898 | /* The .stab section. */ |
| 899 | asection *stabsec; |
| 900 | /* The .stabstr section. */ |
| 901 | asection *strsec; |
| 902 | /* The contents of the .stab section. */ |
| 903 | bfd_byte *stabs; |
| 904 | /* The contents of the .stabstr section. */ |
| 905 | bfd_byte *strs; |
| 906 | |
| 907 | /* A table that indexes stabs by memory address. */ |
| 908 | struct indexentry *indextable; |
| 909 | /* The number of entries in indextable. */ |
| 910 | int indextablesize; |
| 911 | |
| 912 | #ifdef ENABLE_CACHING |
| 913 | /* Cached values to restart quickly. */ |
| 914 | struct indexentry *cached_indexentry; |
| 915 | bfd_vma cached_offset; |
| 916 | bfd_byte *cached_stab; |
| 917 | char *cached_file_name; |
| 918 | #endif |
| 919 | |
| 920 | /* Saved ptr to malloc'ed filename. */ |
| 921 | char *filename; |
| 922 | }; |
| 923 | |
| 924 | bfd_boolean |
| 925 | _bfd_stab_section_find_nearest_line (bfd *abfd, |
| 926 | asymbol **symbols, |
| 927 | asection *section, |
| 928 | bfd_vma offset, |
| 929 | bfd_boolean *pfound, |
| 930 | const char **pfilename, |
| 931 | const char **pfnname, |
| 932 | unsigned int *pline, |
| 933 | void **pinfo) |
| 934 | { |
| 935 | struct stab_find_info *info; |
| 936 | bfd_size_type stabsize, strsize; |
| 937 | bfd_byte *stab, *str; |
| 938 | bfd_byte *nul_fun, *nul_str; |
| 939 | bfd_size_type stroff; |
| 940 | struct indexentry *indexentry; |
| 941 | char *file_name; |
| 942 | char *directory_name; |
| 943 | bfd_boolean saw_line, saw_func; |
| 944 | |
| 945 | *pfound = FALSE; |
| 946 | *pfilename = bfd_get_filename (abfd); |
| 947 | *pfnname = NULL; |
| 948 | *pline = 0; |
| 949 | |
| 950 | /* Stabs entries use a 12 byte format: |
| 951 | 4 byte string table index |
| 952 | 1 byte stab type |
| 953 | 1 byte stab other field |
| 954 | 2 byte stab desc field |
| 955 | 4 byte stab value |
| 956 | FIXME: This will have to change for a 64 bit object format. |
| 957 | |
| 958 | The stabs symbols are divided into compilation units. For the |
| 959 | first entry in each unit, the type of 0, the value is the length |
| 960 | of the string table for this unit, and the desc field is the |
| 961 | number of stabs symbols for this unit. */ |
| 962 | |
| 963 | #define STRDXOFF (0) |
| 964 | #define TYPEOFF (4) |
| 965 | #define OTHEROFF (5) |
| 966 | #define DESCOFF (6) |
| 967 | #define VALOFF (8) |
| 968 | #define STABSIZE (12) |
| 969 | |
| 970 | info = (struct stab_find_info *) *pinfo; |
| 971 | if (info != NULL) |
| 972 | { |
| 973 | if (info->stabsec == NULL || info->strsec == NULL) |
| 974 | { |
| 975 | /* No stabs debugging information. */ |
| 976 | return TRUE; |
| 977 | } |
| 978 | |
| 979 | stabsize = (info->stabsec->rawsize |
| 980 | ? info->stabsec->rawsize |
| 981 | : info->stabsec->size); |
| 982 | strsize = (info->strsec->rawsize |
| 983 | ? info->strsec->rawsize |
| 984 | : info->strsec->size); |
| 985 | } |
| 986 | else |
| 987 | { |
| 988 | long reloc_size, reloc_count; |
| 989 | arelent **reloc_vector; |
| 990 | int i; |
| 991 | char *function_name; |
| 992 | bfd_size_type amt = sizeof *info; |
| 993 | |
| 994 | info = (struct stab_find_info *) bfd_zalloc (abfd, amt); |
| 995 | if (info == NULL) |
| 996 | return FALSE; |
| 997 | |
| 998 | /* FIXME: When using the linker --split-by-file or |
| 999 | --split-by-reloc options, it is possible for the .stab and |
| 1000 | .stabstr sections to be split. We should handle that. */ |
| 1001 | |
| 1002 | info->stabsec = bfd_get_section_by_name (abfd, ".stab"); |
| 1003 | info->strsec = bfd_get_section_by_name (abfd, ".stabstr"); |
| 1004 | |
| 1005 | if (info->stabsec == NULL || info->strsec == NULL) |
| 1006 | { |
| 1007 | /* Try SOM section names. */ |
| 1008 | info->stabsec = bfd_get_section_by_name (abfd, "$GDB_SYMBOLS$"); |
| 1009 | info->strsec = bfd_get_section_by_name (abfd, "$GDB_STRINGS$"); |
| 1010 | |
| 1011 | if (info->stabsec == NULL || info->strsec == NULL) |
| 1012 | { |
| 1013 | /* No stabs debugging information. Set *pinfo so that we |
| 1014 | can return quickly in the info != NULL case above. */ |
| 1015 | *pinfo = info; |
| 1016 | return TRUE; |
| 1017 | } |
| 1018 | } |
| 1019 | |
| 1020 | stabsize = (info->stabsec->rawsize |
| 1021 | ? info->stabsec->rawsize |
| 1022 | : info->stabsec->size); |
| 1023 | stabsize = (stabsize / STABSIZE) * STABSIZE; |
| 1024 | strsize = (info->strsec->rawsize |
| 1025 | ? info->strsec->rawsize |
| 1026 | : info->strsec->size); |
| 1027 | |
| 1028 | info->stabs = (bfd_byte *) bfd_alloc (abfd, stabsize); |
| 1029 | info->strs = (bfd_byte *) bfd_alloc (abfd, strsize); |
| 1030 | if (info->stabs == NULL || info->strs == NULL) |
| 1031 | return FALSE; |
| 1032 | |
| 1033 | if (! bfd_get_section_contents (abfd, info->stabsec, info->stabs, |
| 1034 | 0, stabsize) |
| 1035 | || ! bfd_get_section_contents (abfd, info->strsec, info->strs, |
| 1036 | 0, strsize)) |
| 1037 | return FALSE; |
| 1038 | |
| 1039 | /* Stab strings ought to be nul terminated. Ensure the last one |
| 1040 | is, to prevent running off the end of the buffer. */ |
| 1041 | info->strs[strsize - 1] = 0; |
| 1042 | |
| 1043 | /* If this is a relocatable object file, we have to relocate |
| 1044 | the entries in .stab. This should always be simple 32 bit |
| 1045 | relocations against symbols defined in this object file, so |
| 1046 | this should be no big deal. */ |
| 1047 | reloc_size = bfd_get_reloc_upper_bound (abfd, info->stabsec); |
| 1048 | if (reloc_size < 0) |
| 1049 | return FALSE; |
| 1050 | reloc_vector = (arelent **) bfd_malloc (reloc_size); |
| 1051 | if (reloc_vector == NULL && reloc_size != 0) |
| 1052 | return FALSE; |
| 1053 | reloc_count = bfd_canonicalize_reloc (abfd, info->stabsec, reloc_vector, |
| 1054 | symbols); |
| 1055 | if (reloc_count < 0) |
| 1056 | { |
| 1057 | if (reloc_vector != NULL) |
| 1058 | free (reloc_vector); |
| 1059 | return FALSE; |
| 1060 | } |
| 1061 | if (reloc_count > 0) |
| 1062 | { |
| 1063 | arelent **pr; |
| 1064 | |
| 1065 | for (pr = reloc_vector; *pr != NULL; pr++) |
| 1066 | { |
| 1067 | arelent *r; |
| 1068 | unsigned long val; |
| 1069 | asymbol *sym; |
| 1070 | bfd_size_type octets; |
| 1071 | |
| 1072 | r = *pr; |
| 1073 | /* Ignore R_*_NONE relocs. */ |
| 1074 | if (r->howto->dst_mask == 0) |
| 1075 | continue; |
| 1076 | |
| 1077 | octets = r->address * bfd_octets_per_byte (abfd, NULL); |
| 1078 | if (r->howto->rightshift != 0 |
| 1079 | || r->howto->size != 2 |
| 1080 | || r->howto->bitsize != 32 |
| 1081 | || r->howto->pc_relative |
| 1082 | || r->howto->bitpos != 0 |
| 1083 | || r->howto->dst_mask != 0xffffffff |
| 1084 | || octets + 4 > stabsize) |
| 1085 | { |
| 1086 | _bfd_error_handler |
| 1087 | (_("unsupported .stab relocation")); |
| 1088 | bfd_set_error (bfd_error_invalid_operation); |
| 1089 | if (reloc_vector != NULL) |
| 1090 | free (reloc_vector); |
| 1091 | return FALSE; |
| 1092 | } |
| 1093 | |
| 1094 | val = bfd_get_32 (abfd, info->stabs + octets); |
| 1095 | val &= r->howto->src_mask; |
| 1096 | sym = *r->sym_ptr_ptr; |
| 1097 | val += sym->value + sym->section->vma + r->addend; |
| 1098 | bfd_put_32 (abfd, (bfd_vma) val, info->stabs + octets); |
| 1099 | } |
| 1100 | } |
| 1101 | |
| 1102 | if (reloc_vector != NULL) |
| 1103 | free (reloc_vector); |
| 1104 | |
| 1105 | /* First time through this function, build a table matching |
| 1106 | function VM addresses to stabs, then sort based on starting |
| 1107 | VM address. Do this in two passes: once to count how many |
| 1108 | table entries we'll need, and a second to actually build the |
| 1109 | table. */ |
| 1110 | |
| 1111 | info->indextablesize = 0; |
| 1112 | nul_fun = NULL; |
| 1113 | for (stab = info->stabs; stab < info->stabs + stabsize; stab += STABSIZE) |
| 1114 | { |
| 1115 | if (stab[TYPEOFF] == (bfd_byte) N_SO) |
| 1116 | { |
| 1117 | /* if we did not see a function def, leave space for one. */ |
| 1118 | if (nul_fun != NULL) |
| 1119 | ++info->indextablesize; |
| 1120 | |
| 1121 | /* N_SO with null name indicates EOF */ |
| 1122 | if (bfd_get_32 (abfd, stab + STRDXOFF) == 0) |
| 1123 | nul_fun = NULL; |
| 1124 | else |
| 1125 | { |
| 1126 | nul_fun = stab; |
| 1127 | |
| 1128 | /* two N_SO's in a row is a filename and directory. Skip */ |
| 1129 | if (stab + STABSIZE + TYPEOFF < info->stabs + stabsize |
| 1130 | && *(stab + STABSIZE + TYPEOFF) == (bfd_byte) N_SO) |
| 1131 | stab += STABSIZE; |
| 1132 | } |
| 1133 | } |
| 1134 | else if (stab[TYPEOFF] == (bfd_byte) N_FUN |
| 1135 | && bfd_get_32 (abfd, stab + STRDXOFF) != 0) |
| 1136 | { |
| 1137 | nul_fun = NULL; |
| 1138 | ++info->indextablesize; |
| 1139 | } |
| 1140 | } |
| 1141 | |
| 1142 | if (nul_fun != NULL) |
| 1143 | ++info->indextablesize; |
| 1144 | |
| 1145 | if (info->indextablesize == 0) |
| 1146 | return TRUE; |
| 1147 | ++info->indextablesize; |
| 1148 | |
| 1149 | amt = info->indextablesize; |
| 1150 | amt *= sizeof (struct indexentry); |
| 1151 | info->indextable = (struct indexentry *) bfd_alloc (abfd, amt); |
| 1152 | if (info->indextable == NULL) |
| 1153 | return FALSE; |
| 1154 | |
| 1155 | file_name = NULL; |
| 1156 | directory_name = NULL; |
| 1157 | nul_fun = NULL; |
| 1158 | stroff = 0; |
| 1159 | |
| 1160 | for (i = 0, stab = info->stabs, nul_str = str = info->strs; |
| 1161 | i < info->indextablesize && stab < info->stabs + stabsize; |
| 1162 | stab += STABSIZE) |
| 1163 | { |
| 1164 | switch (stab[TYPEOFF]) |
| 1165 | { |
| 1166 | case 0: |
| 1167 | /* This is the first entry in a compilation unit. */ |
| 1168 | if ((bfd_size_type) ((info->strs + strsize) - str) < stroff) |
| 1169 | break; |
| 1170 | str += stroff; |
| 1171 | stroff = bfd_get_32 (abfd, stab + VALOFF); |
| 1172 | break; |
| 1173 | |
| 1174 | case N_SO: |
| 1175 | /* The main file name. */ |
| 1176 | |
| 1177 | /* The following code creates a new indextable entry with |
| 1178 | a NULL function name if there were no N_FUNs in a file. |
| 1179 | Note that a N_SO without a file name is an EOF and |
| 1180 | there could be 2 N_SO following it with the new filename |
| 1181 | and directory. */ |
| 1182 | if (nul_fun != NULL) |
| 1183 | { |
| 1184 | info->indextable[i].val = bfd_get_32 (abfd, nul_fun + VALOFF); |
| 1185 | info->indextable[i].stab = nul_fun; |
| 1186 | info->indextable[i].str = nul_str; |
| 1187 | info->indextable[i].directory_name = directory_name; |
| 1188 | info->indextable[i].file_name = file_name; |
| 1189 | info->indextable[i].function_name = NULL; |
| 1190 | info->indextable[i].idx = i; |
| 1191 | ++i; |
| 1192 | } |
| 1193 | |
| 1194 | directory_name = NULL; |
| 1195 | file_name = (char *) str + bfd_get_32 (abfd, stab + STRDXOFF); |
| 1196 | if (file_name == (char *) str) |
| 1197 | { |
| 1198 | file_name = NULL; |
| 1199 | nul_fun = NULL; |
| 1200 | } |
| 1201 | else |
| 1202 | { |
| 1203 | nul_fun = stab; |
| 1204 | nul_str = str; |
| 1205 | if (file_name >= (char *) info->strs + strsize |
| 1206 | || file_name < (char *) str) |
| 1207 | file_name = NULL; |
| 1208 | if (stab + STABSIZE + TYPEOFF < info->stabs + stabsize |
| 1209 | && *(stab + STABSIZE + TYPEOFF) == (bfd_byte) N_SO) |
| 1210 | { |
| 1211 | /* Two consecutive N_SOs are a directory and a |
| 1212 | file name. */ |
| 1213 | stab += STABSIZE; |
| 1214 | directory_name = file_name; |
| 1215 | file_name = ((char *) str |
| 1216 | + bfd_get_32 (abfd, stab + STRDXOFF)); |
| 1217 | if (file_name >= (char *) info->strs + strsize |
| 1218 | || file_name < (char *) str) |
| 1219 | file_name = NULL; |
| 1220 | } |
| 1221 | } |
| 1222 | break; |
| 1223 | |
| 1224 | case N_SOL: |
| 1225 | /* The name of an include file. */ |
| 1226 | file_name = (char *) str + bfd_get_32 (abfd, stab + STRDXOFF); |
| 1227 | /* PR 17512: file: 0c680a1f. */ |
| 1228 | /* PR 17512: file: 5da8aec4. */ |
| 1229 | if (file_name >= (char *) info->strs + strsize |
| 1230 | || file_name < (char *) str) |
| 1231 | file_name = NULL; |
| 1232 | break; |
| 1233 | |
| 1234 | case N_FUN: |
| 1235 | /* A function name. */ |
| 1236 | function_name = (char *) str + bfd_get_32 (abfd, stab + STRDXOFF); |
| 1237 | if (function_name == (char *) str) |
| 1238 | continue; |
| 1239 | if (function_name >= (char *) info->strs + strsize |
| 1240 | || function_name < (char *) str) |
| 1241 | function_name = NULL; |
| 1242 | |
| 1243 | nul_fun = NULL; |
| 1244 | info->indextable[i].val = bfd_get_32 (abfd, stab + VALOFF); |
| 1245 | info->indextable[i].stab = stab; |
| 1246 | info->indextable[i].str = str; |
| 1247 | info->indextable[i].directory_name = directory_name; |
| 1248 | info->indextable[i].file_name = file_name; |
| 1249 | info->indextable[i].function_name = function_name; |
| 1250 | info->indextable[i].idx = i; |
| 1251 | ++i; |
| 1252 | break; |
| 1253 | } |
| 1254 | } |
| 1255 | |
| 1256 | if (nul_fun != NULL) |
| 1257 | { |
| 1258 | info->indextable[i].val = bfd_get_32 (abfd, nul_fun + VALOFF); |
| 1259 | info->indextable[i].stab = nul_fun; |
| 1260 | info->indextable[i].str = nul_str; |
| 1261 | info->indextable[i].directory_name = directory_name; |
| 1262 | info->indextable[i].file_name = file_name; |
| 1263 | info->indextable[i].function_name = NULL; |
| 1264 | info->indextable[i].idx = i; |
| 1265 | ++i; |
| 1266 | } |
| 1267 | |
| 1268 | info->indextable[i].val = (bfd_vma) -1; |
| 1269 | info->indextable[i].stab = info->stabs + stabsize; |
| 1270 | info->indextable[i].str = str; |
| 1271 | info->indextable[i].directory_name = NULL; |
| 1272 | info->indextable[i].file_name = NULL; |
| 1273 | info->indextable[i].function_name = NULL; |
| 1274 | info->indextable[i].idx = i; |
| 1275 | ++i; |
| 1276 | |
| 1277 | info->indextablesize = i; |
| 1278 | qsort (info->indextable, (size_t) i, sizeof (struct indexentry), |
| 1279 | cmpindexentry); |
| 1280 | |
| 1281 | *pinfo = info; |
| 1282 | } |
| 1283 | |
| 1284 | /* We are passed a section relative offset. The offsets in the |
| 1285 | stabs information are absolute. */ |
| 1286 | offset += bfd_section_vma (section); |
| 1287 | |
| 1288 | #ifdef ENABLE_CACHING |
| 1289 | if (info->cached_indexentry != NULL |
| 1290 | && offset >= info->cached_offset |
| 1291 | && offset < (info->cached_indexentry + 1)->val) |
| 1292 | { |
| 1293 | stab = info->cached_stab; |
| 1294 | indexentry = info->cached_indexentry; |
| 1295 | file_name = info->cached_file_name; |
| 1296 | } |
| 1297 | else |
| 1298 | #endif |
| 1299 | { |
| 1300 | long low, high; |
| 1301 | long mid = -1; |
| 1302 | |
| 1303 | /* Cache non-existent or invalid. Do binary search on |
| 1304 | indextable. */ |
| 1305 | indexentry = NULL; |
| 1306 | |
| 1307 | low = 0; |
| 1308 | high = info->indextablesize - 1; |
| 1309 | while (low != high) |
| 1310 | { |
| 1311 | mid = (high + low) / 2; |
| 1312 | if (offset >= info->indextable[mid].val |
| 1313 | && offset < info->indextable[mid + 1].val) |
| 1314 | { |
| 1315 | indexentry = &info->indextable[mid]; |
| 1316 | break; |
| 1317 | } |
| 1318 | |
| 1319 | if (info->indextable[mid].val > offset) |
| 1320 | high = mid; |
| 1321 | else |
| 1322 | low = mid + 1; |
| 1323 | } |
| 1324 | |
| 1325 | if (indexentry == NULL) |
| 1326 | return TRUE; |
| 1327 | |
| 1328 | stab = indexentry->stab + STABSIZE; |
| 1329 | file_name = indexentry->file_name; |
| 1330 | } |
| 1331 | |
| 1332 | directory_name = indexentry->directory_name; |
| 1333 | str = indexentry->str; |
| 1334 | |
| 1335 | saw_line = FALSE; |
| 1336 | saw_func = FALSE; |
| 1337 | for (; stab < (indexentry+1)->stab; stab += STABSIZE) |
| 1338 | { |
| 1339 | bfd_boolean done; |
| 1340 | bfd_vma val; |
| 1341 | |
| 1342 | done = FALSE; |
| 1343 | |
| 1344 | switch (stab[TYPEOFF]) |
| 1345 | { |
| 1346 | case N_SOL: |
| 1347 | /* The name of an include file. */ |
| 1348 | val = bfd_get_32 (abfd, stab + VALOFF); |
| 1349 | if (val <= offset) |
| 1350 | { |
| 1351 | file_name = (char *) str + bfd_get_32 (abfd, stab + STRDXOFF); |
| 1352 | if (file_name >= (char *) info->strs + strsize |
| 1353 | || file_name < (char *) str) |
| 1354 | file_name = NULL; |
| 1355 | *pline = 0; |
| 1356 | } |
| 1357 | break; |
| 1358 | |
| 1359 | case N_SLINE: |
| 1360 | case N_DSLINE: |
| 1361 | case N_BSLINE: |
| 1362 | /* A line number. If the function was specified, then the value |
| 1363 | is relative to the start of the function. Otherwise, the |
| 1364 | value is an absolute address. */ |
| 1365 | val = ((indexentry->function_name ? indexentry->val : 0) |
| 1366 | + bfd_get_32 (abfd, stab + VALOFF)); |
| 1367 | /* If this line starts before our desired offset, or if it's |
| 1368 | the first line we've been able to find, use it. The |
| 1369 | !saw_line check works around a bug in GCC 2.95.3, which emits |
| 1370 | the first N_SLINE late. */ |
| 1371 | if (!saw_line || val <= offset) |
| 1372 | { |
| 1373 | *pline = bfd_get_16 (abfd, stab + DESCOFF); |
| 1374 | |
| 1375 | #ifdef ENABLE_CACHING |
| 1376 | info->cached_stab = stab; |
| 1377 | info->cached_offset = val; |
| 1378 | info->cached_file_name = file_name; |
| 1379 | info->cached_indexentry = indexentry; |
| 1380 | #endif |
| 1381 | } |
| 1382 | if (val > offset) |
| 1383 | done = TRUE; |
| 1384 | saw_line = TRUE; |
| 1385 | break; |
| 1386 | |
| 1387 | case N_FUN: |
| 1388 | case N_SO: |
| 1389 | if (saw_func || saw_line) |
| 1390 | done = TRUE; |
| 1391 | saw_func = TRUE; |
| 1392 | break; |
| 1393 | } |
| 1394 | |
| 1395 | if (done) |
| 1396 | break; |
| 1397 | } |
| 1398 | |
| 1399 | *pfound = TRUE; |
| 1400 | |
| 1401 | if (file_name == NULL || IS_ABSOLUTE_PATH (file_name) |
| 1402 | || directory_name == NULL) |
| 1403 | *pfilename = file_name; |
| 1404 | else |
| 1405 | { |
| 1406 | size_t dirlen; |
| 1407 | |
| 1408 | dirlen = strlen (directory_name); |
| 1409 | if (info->filename == NULL |
| 1410 | || filename_ncmp (info->filename, directory_name, dirlen) != 0 |
| 1411 | || filename_cmp (info->filename + dirlen, file_name) != 0) |
| 1412 | { |
| 1413 | size_t len; |
| 1414 | |
| 1415 | /* Don't free info->filename here. objdump and other |
| 1416 | apps keep a copy of a previously returned file name |
| 1417 | pointer. */ |
| 1418 | len = strlen (file_name) + 1; |
| 1419 | info->filename = (char *) bfd_alloc (abfd, dirlen + len); |
| 1420 | if (info->filename == NULL) |
| 1421 | return FALSE; |
| 1422 | memcpy (info->filename, directory_name, dirlen); |
| 1423 | memcpy (info->filename + dirlen, file_name, len); |
| 1424 | } |
| 1425 | |
| 1426 | *pfilename = info->filename; |
| 1427 | } |
| 1428 | |
| 1429 | if (indexentry->function_name != NULL) |
| 1430 | { |
| 1431 | char *s; |
| 1432 | |
| 1433 | /* This will typically be something like main:F(0,1), so we want |
| 1434 | to clobber the colon. It's OK to change the name, since the |
| 1435 | string is in our own local storage anyhow. */ |
| 1436 | s = strchr (indexentry->function_name, ':'); |
| 1437 | if (s != NULL) |
| 1438 | *s = '\0'; |
| 1439 | |
| 1440 | *pfnname = indexentry->function_name; |
| 1441 | } |
| 1442 | |
| 1443 | return TRUE; |
| 1444 | } |
| 1445 | |
| 1446 | long |
| 1447 | _bfd_nosymbols_canonicalize_symtab (bfd *abfd ATTRIBUTE_UNUSED, |
| 1448 | asymbol **location ATTRIBUTE_UNUSED) |
| 1449 | { |
| 1450 | return 0; |
| 1451 | } |
| 1452 | |
| 1453 | void |
| 1454 | _bfd_nosymbols_print_symbol (bfd *abfd ATTRIBUTE_UNUSED, |
| 1455 | void *afile ATTRIBUTE_UNUSED, |
| 1456 | asymbol *symbol ATTRIBUTE_UNUSED, |
| 1457 | bfd_print_symbol_type how ATTRIBUTE_UNUSED) |
| 1458 | { |
| 1459 | } |
| 1460 | |
| 1461 | void |
| 1462 | _bfd_nosymbols_get_symbol_info (bfd *abfd ATTRIBUTE_UNUSED, |
| 1463 | asymbol *sym ATTRIBUTE_UNUSED, |
| 1464 | symbol_info *ret ATTRIBUTE_UNUSED) |
| 1465 | { |
| 1466 | } |
| 1467 | |
| 1468 | const char * |
| 1469 | _bfd_nosymbols_get_symbol_version_string (bfd *abfd, |
| 1470 | asymbol *symbol ATTRIBUTE_UNUSED, |
| 1471 | bfd_boolean *hidden ATTRIBUTE_UNUSED) |
| 1472 | { |
| 1473 | return (const char *) _bfd_ptr_bfd_null_error (abfd); |
| 1474 | } |
| 1475 | |
| 1476 | bfd_boolean |
| 1477 | _bfd_nosymbols_bfd_is_local_label_name (bfd *abfd ATTRIBUTE_UNUSED, |
| 1478 | const char *name ATTRIBUTE_UNUSED) |
| 1479 | { |
| 1480 | return FALSE; |
| 1481 | } |
| 1482 | |
| 1483 | alent * |
| 1484 | _bfd_nosymbols_get_lineno (bfd *abfd, asymbol *sym ATTRIBUTE_UNUSED) |
| 1485 | { |
| 1486 | return (alent *) _bfd_ptr_bfd_null_error (abfd); |
| 1487 | } |
| 1488 | |
| 1489 | bfd_boolean |
| 1490 | _bfd_nosymbols_find_nearest_line |
| 1491 | (bfd *abfd, |
| 1492 | asymbol **symbols ATTRIBUTE_UNUSED, |
| 1493 | asection *section ATTRIBUTE_UNUSED, |
| 1494 | bfd_vma offset ATTRIBUTE_UNUSED, |
| 1495 | const char **filename_ptr ATTRIBUTE_UNUSED, |
| 1496 | const char **functionname_ptr ATTRIBUTE_UNUSED, |
| 1497 | unsigned int *line_ptr ATTRIBUTE_UNUSED, |
| 1498 | unsigned int *discriminator_ptr ATTRIBUTE_UNUSED) |
| 1499 | { |
| 1500 | return _bfd_bool_bfd_false_error (abfd); |
| 1501 | } |
| 1502 | |
| 1503 | bfd_boolean |
| 1504 | _bfd_nosymbols_find_line (bfd *abfd, |
| 1505 | asymbol **symbols ATTRIBUTE_UNUSED, |
| 1506 | asymbol *symbol ATTRIBUTE_UNUSED, |
| 1507 | const char **filename_ptr ATTRIBUTE_UNUSED, |
| 1508 | unsigned int *line_ptr ATTRIBUTE_UNUSED) |
| 1509 | { |
| 1510 | return _bfd_bool_bfd_false_error (abfd); |
| 1511 | } |
| 1512 | |
| 1513 | bfd_boolean |
| 1514 | _bfd_nosymbols_find_inliner_info |
| 1515 | (bfd *abfd, |
| 1516 | const char **filename_ptr ATTRIBUTE_UNUSED, |
| 1517 | const char **functionname_ptr ATTRIBUTE_UNUSED, |
| 1518 | unsigned int *line_ptr ATTRIBUTE_UNUSED) |
| 1519 | { |
| 1520 | return _bfd_bool_bfd_false_error (abfd); |
| 1521 | } |
| 1522 | |
| 1523 | asymbol * |
| 1524 | _bfd_nosymbols_bfd_make_debug_symbol (bfd *abfd, |
| 1525 | void *ptr ATTRIBUTE_UNUSED, |
| 1526 | unsigned long sz ATTRIBUTE_UNUSED) |
| 1527 | { |
| 1528 | return (asymbol *) _bfd_ptr_bfd_null_error (abfd); |
| 1529 | } |
| 1530 | |
| 1531 | long |
| 1532 | _bfd_nosymbols_read_minisymbols (bfd *abfd, |
| 1533 | bfd_boolean dynamic ATTRIBUTE_UNUSED, |
| 1534 | void **minisymsp ATTRIBUTE_UNUSED, |
| 1535 | unsigned int *sizep ATTRIBUTE_UNUSED) |
| 1536 | { |
| 1537 | return _bfd_long_bfd_n1_error (abfd); |
| 1538 | } |
| 1539 | |
| 1540 | asymbol * |
| 1541 | _bfd_nosymbols_minisymbol_to_symbol (bfd *abfd, |
| 1542 | bfd_boolean dynamic ATTRIBUTE_UNUSED, |
| 1543 | const void *minisym ATTRIBUTE_UNUSED, |
| 1544 | asymbol *sym ATTRIBUTE_UNUSED) |
| 1545 | { |
| 1546 | return (asymbol *) _bfd_ptr_bfd_null_error (abfd); |
| 1547 | } |
| 1548 | |
| 1549 | long |
| 1550 | _bfd_nodynamic_get_synthetic_symtab (bfd *abfd, |
| 1551 | long symcount ATTRIBUTE_UNUSED, |
| 1552 | asymbol **syms ATTRIBUTE_UNUSED, |
| 1553 | long dynsymcount ATTRIBUTE_UNUSED, |
| 1554 | asymbol **dynsyms ATTRIBUTE_UNUSED, |
| 1555 | asymbol **ret ATTRIBUTE_UNUSED) |
| 1556 | { |
| 1557 | return _bfd_long_bfd_n1_error (abfd); |
| 1558 | } |