| 1 | /* Generic symbol-table support for the BFD library. |
| 2 | Copyright (C) 1990, 91, 92, 93, 94, 95, 1996 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 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 20 | |
| 21 | /* |
| 22 | SECTION |
| 23 | Symbols |
| 24 | |
| 25 | BFD tries to maintain as much symbol information as it can when |
| 26 | it moves information from file to file. BFD passes information |
| 27 | to applications though the <<asymbol>> structure. When the |
| 28 | application requests the symbol table, BFD reads the table in |
| 29 | the native form and translates parts of it into the internal |
| 30 | format. To maintain more than the information passed to |
| 31 | applications, some targets keep some information ``behind the |
| 32 | scenes'' in a structure only the particular back end knows |
| 33 | about. For example, the coff back end keeps the original |
| 34 | symbol table structure as well as the canonical structure when |
| 35 | a BFD is read in. On output, the coff back end can reconstruct |
| 36 | the output symbol table so that no information is lost, even |
| 37 | information unique to coff which BFD doesn't know or |
| 38 | understand. If a coff symbol table were read, but were written |
| 39 | through an a.out back end, all the coff specific information |
| 40 | would be lost. The symbol table of a BFD |
| 41 | is not necessarily read in until a canonicalize request is |
| 42 | made. Then the BFD back end fills in a table provided by the |
| 43 | application with pointers to the canonical information. To |
| 44 | output symbols, the application provides BFD with a table of |
| 45 | pointers to pointers to <<asymbol>>s. This allows applications |
| 46 | like the linker to output a symbol as it was read, since the ``behind |
| 47 | the scenes'' information will be still available. |
| 48 | @menu |
| 49 | @* Reading Symbols:: |
| 50 | @* Writing Symbols:: |
| 51 | @* Mini Symbols:: |
| 52 | @* typedef asymbol:: |
| 53 | @* symbol handling functions:: |
| 54 | @end menu |
| 55 | |
| 56 | INODE |
| 57 | Reading Symbols, Writing Symbols, Symbols, Symbols |
| 58 | SUBSECTION |
| 59 | Reading symbols |
| 60 | |
| 61 | There are two stages to reading a symbol table from a BFD: |
| 62 | allocating storage, and the actual reading process. This is an |
| 63 | excerpt from an application which reads the symbol table: |
| 64 | |
| 65 | | long storage_needed; |
| 66 | | asymbol **symbol_table; |
| 67 | | long number_of_symbols; |
| 68 | | long i; |
| 69 | | |
| 70 | | storage_needed = bfd_get_symtab_upper_bound (abfd); |
| 71 | | |
| 72 | | if (storage_needed < 0) |
| 73 | | FAIL |
| 74 | | |
| 75 | | if (storage_needed == 0) { |
| 76 | | return ; |
| 77 | | } |
| 78 | | symbol_table = (asymbol **) xmalloc (storage_needed); |
| 79 | | ... |
| 80 | | number_of_symbols = |
| 81 | | bfd_canonicalize_symtab (abfd, symbol_table); |
| 82 | | |
| 83 | | if (number_of_symbols < 0) |
| 84 | | FAIL |
| 85 | | |
| 86 | | for (i = 0; i < number_of_symbols; i++) { |
| 87 | | process_symbol (symbol_table[i]); |
| 88 | | } |
| 89 | |
| 90 | All storage for the symbols themselves is in an obstack |
| 91 | connected to the BFD; it is freed when the BFD is closed. |
| 92 | |
| 93 | |
| 94 | INODE |
| 95 | Writing Symbols, Mini Symbols, Reading Symbols, Symbols |
| 96 | SUBSECTION |
| 97 | Writing symbols |
| 98 | |
| 99 | Writing of a symbol table is automatic when a BFD open for |
| 100 | writing is closed. The application attaches a vector of |
| 101 | pointers to pointers to symbols to the BFD being written, and |
| 102 | fills in the symbol count. The close and cleanup code reads |
| 103 | through the table provided and performs all the necessary |
| 104 | operations. The BFD output code must always be provided with an |
| 105 | ``owned'' symbol: one which has come from another BFD, or one |
| 106 | which has been created using <<bfd_make_empty_symbol>>. Here is an |
| 107 | example showing the creation of a symbol table with only one element: |
| 108 | |
| 109 | | #include "bfd.h" |
| 110 | | main() |
| 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] = (asymbol *)0; |
| 126 | | |
| 127 | | bfd_set_symtab(abfd, ptrs, 1); |
| 128 | | bfd_close(abfd); |
| 129 | | } |
| 130 | | |
| 131 | | ./makesym |
| 132 | | nm foo |
| 133 | | 00012345 A dummy_symbol |
| 134 | |
| 135 | Many formats cannot represent arbitary symbol information; for |
| 136 | instance, the <<a.out>> object format does not allow an |
| 137 | arbitary number of sections. A symbol pointing to a section |
| 138 | which is not one of <<.text>>, <<.data>> or <<.bss>> cannot |
| 139 | be described. |
| 140 | |
| 141 | INODE |
| 142 | Mini Symbols, typedef asymbol, Writing Symbols, Symbols |
| 143 | SUBSECTION |
| 144 | Mini Symbols |
| 145 | |
| 146 | Mini symbols provide read-only access to the symbol table. |
| 147 | They use less memory space, but require more time to access. |
| 148 | They can be useful for tools like nm or objdump, which may |
| 149 | have to handle symbol tables of extremely large executables. |
| 150 | |
| 151 | The <<bfd_read_minisymbols>> function will read the symbols |
| 152 | into memory in an internal form. It will return a <<void *>> |
| 153 | pointer to a block of memory, a symbol count, and the size of |
| 154 | each symbol. The pointer is allocated using <<malloc>>, and |
| 155 | should be freed by the caller when it is no longer needed. |
| 156 | |
| 157 | The function <<bfd_minisymbol_to_symbol>> will take a pointer |
| 158 | to a minisymbol, and a pointer to a structure returned by |
| 159 | <<bfd_make_empty_symbol>>, and return a <<asymbol>> structure. |
| 160 | The return value may or may not be the same as the value from |
| 161 | <<bfd_make_empty_symbol>> which was passed in. |
| 162 | |
| 163 | */ |
| 164 | |
| 165 | |
| 166 | |
| 167 | /* |
| 168 | DOCDD |
| 169 | INODE |
| 170 | typedef asymbol, symbol handling functions, Mini Symbols, Symbols |
| 171 | |
| 172 | */ |
| 173 | /* |
| 174 | SUBSECTION |
| 175 | typedef asymbol |
| 176 | |
| 177 | An <<asymbol>> has the form: |
| 178 | |
| 179 | */ |
| 180 | |
| 181 | /* |
| 182 | CODE_FRAGMENT |
| 183 | |
| 184 | . |
| 185 | .typedef struct symbol_cache_entry |
| 186 | .{ |
| 187 | . {* A pointer to the BFD which owns the symbol. This information |
| 188 | . is necessary so that a back end can work out what additional |
| 189 | . information (invisible to the application writer) is carried |
| 190 | . with the symbol. |
| 191 | . |
| 192 | . This field is *almost* redundant, since you can use section->owner |
| 193 | . instead, except that some symbols point to the global sections |
| 194 | . bfd_{abs,com,und}_section. This could be fixed by making |
| 195 | . these globals be per-bfd (or per-target-flavor). FIXME. *} |
| 196 | . |
| 197 | . struct _bfd *the_bfd; {* Use bfd_asymbol_bfd(sym) to access this field. *} |
| 198 | . |
| 199 | . {* The text of the symbol. The name is left alone, and not copied; the |
| 200 | . application may not alter it. *} |
| 201 | . CONST char *name; |
| 202 | . |
| 203 | . {* The value of the symbol. This really should be a union of a |
| 204 | . numeric value with a pointer, since some flags indicate that |
| 205 | . a pointer to another symbol is stored here. *} |
| 206 | . symvalue value; |
| 207 | . |
| 208 | . {* Attributes of a symbol: *} |
| 209 | . |
| 210 | .#define BSF_NO_FLAGS 0x00 |
| 211 | . |
| 212 | . {* The symbol has local scope; <<static>> in <<C>>. The value |
| 213 | . is the offset into the section of the data. *} |
| 214 | .#define BSF_LOCAL 0x01 |
| 215 | . |
| 216 | . {* The symbol has global scope; initialized data in <<C>>. The |
| 217 | . value is the offset into the section of the data. *} |
| 218 | .#define BSF_GLOBAL 0x02 |
| 219 | . |
| 220 | . {* The symbol has global scope and is exported. The value is |
| 221 | . the offset into the section of the data. *} |
| 222 | .#define BSF_EXPORT BSF_GLOBAL {* no real difference *} |
| 223 | . |
| 224 | . {* A normal C symbol would be one of: |
| 225 | . <<BSF_LOCAL>>, <<BSF_FORT_COMM>>, <<BSF_UNDEFINED>> or |
| 226 | . <<BSF_GLOBAL>> *} |
| 227 | . |
| 228 | . {* The symbol is a debugging record. The value has an arbitary |
| 229 | . meaning. *} |
| 230 | .#define BSF_DEBUGGING 0x08 |
| 231 | . |
| 232 | . {* The symbol denotes a function entry point. Used in ELF, |
| 233 | . perhaps others someday. *} |
| 234 | .#define BSF_FUNCTION 0x10 |
| 235 | . |
| 236 | . {* Used by the linker. *} |
| 237 | .#define BSF_KEEP 0x20 |
| 238 | .#define BSF_KEEP_G 0x40 |
| 239 | . |
| 240 | . {* A weak global symbol, overridable without warnings by |
| 241 | . a regular global symbol of the same name. *} |
| 242 | .#define BSF_WEAK 0x80 |
| 243 | . |
| 244 | . {* This symbol was created to point to a section, e.g. ELF's |
| 245 | . STT_SECTION symbols. *} |
| 246 | .#define BSF_SECTION_SYM 0x100 |
| 247 | . |
| 248 | . {* The symbol used to be a common symbol, but now it is |
| 249 | . allocated. *} |
| 250 | .#define BSF_OLD_COMMON 0x200 |
| 251 | . |
| 252 | . {* The default value for common data. *} |
| 253 | .#define BFD_FORT_COMM_DEFAULT_VALUE 0 |
| 254 | . |
| 255 | . {* In some files the type of a symbol sometimes alters its |
| 256 | . location in an output file - ie in coff a <<ISFCN>> symbol |
| 257 | . which is also <<C_EXT>> symbol appears where it was |
| 258 | . declared and not at the end of a section. This bit is set |
| 259 | . by the target BFD part to convey this information. *} |
| 260 | . |
| 261 | .#define BSF_NOT_AT_END 0x400 |
| 262 | . |
| 263 | . {* Signal that the symbol is the label of constructor section. *} |
| 264 | .#define BSF_CONSTRUCTOR 0x800 |
| 265 | . |
| 266 | . {* Signal that the symbol is a warning symbol. The name is a |
| 267 | . warning. The name of the next symbol is the one to warn about; |
| 268 | . if a reference is made to a symbol with the same name as the next |
| 269 | . symbol, a warning is issued by the linker. *} |
| 270 | .#define BSF_WARNING 0x1000 |
| 271 | . |
| 272 | . {* Signal that the symbol is indirect. This symbol is an indirect |
| 273 | . pointer to the symbol with the same name as the next symbol. *} |
| 274 | .#define BSF_INDIRECT 0x2000 |
| 275 | . |
| 276 | . {* BSF_FILE marks symbols that contain a file name. This is used |
| 277 | . for ELF STT_FILE symbols. *} |
| 278 | .#define BSF_FILE 0x4000 |
| 279 | . |
| 280 | . {* Symbol is from dynamic linking information. *} |
| 281 | .#define BSF_DYNAMIC 0x8000 |
| 282 | . |
| 283 | . {* The symbol denotes a data object. Used in ELF, and perhaps |
| 284 | . others someday. *} |
| 285 | .#define BSF_OBJECT 0x10000 |
| 286 | . |
| 287 | . flagword flags; |
| 288 | . |
| 289 | . {* A pointer to the section to which this symbol is |
| 290 | . relative. This will always be non NULL, there are special |
| 291 | . sections for undefined and absolute symbols. *} |
| 292 | . struct sec *section; |
| 293 | . |
| 294 | . {* Back end special data. *} |
| 295 | . union |
| 296 | . { |
| 297 | . PTR p; |
| 298 | . bfd_vma i; |
| 299 | . } udata; |
| 300 | . |
| 301 | .} asymbol; |
| 302 | */ |
| 303 | |
| 304 | #include "bfd.h" |
| 305 | #include "sysdep.h" |
| 306 | #include "libbfd.h" |
| 307 | #include "bfdlink.h" |
| 308 | #include "aout/stab_gnu.h" |
| 309 | |
| 310 | /* |
| 311 | DOCDD |
| 312 | INODE |
| 313 | symbol handling functions, , typedef asymbol, Symbols |
| 314 | SUBSECTION |
| 315 | Symbol handling functions |
| 316 | */ |
| 317 | |
| 318 | /* |
| 319 | FUNCTION |
| 320 | bfd_get_symtab_upper_bound |
| 321 | |
| 322 | DESCRIPTION |
| 323 | Return the number of bytes required to store a vector of pointers |
| 324 | to <<asymbols>> for all the symbols in the BFD @var{abfd}, |
| 325 | including a terminal NULL pointer. If there are no symbols in |
| 326 | the BFD, then return 0. If an error occurs, return -1. |
| 327 | |
| 328 | .#define bfd_get_symtab_upper_bound(abfd) \ |
| 329 | . BFD_SEND (abfd, _bfd_get_symtab_upper_bound, (abfd)) |
| 330 | |
| 331 | */ |
| 332 | |
| 333 | /* |
| 334 | FUNCTION |
| 335 | bfd_is_local_label |
| 336 | |
| 337 | SYNOPSIS |
| 338 | boolean bfd_is_local_label(bfd *abfd, asymbol *sym); |
| 339 | |
| 340 | DESCRIPTION |
| 341 | Return true if the given symbol @var{sym} in the BFD @var{abfd} is |
| 342 | a compiler generated local label, else return false. |
| 343 | .#define bfd_is_local_label(abfd, sym) \ |
| 344 | . BFD_SEND (abfd, _bfd_is_local_label,(abfd, sym)) |
| 345 | */ |
| 346 | |
| 347 | /* |
| 348 | FUNCTION |
| 349 | bfd_canonicalize_symtab |
| 350 | |
| 351 | DESCRIPTION |
| 352 | Read the symbols from the BFD @var{abfd}, and fills in |
| 353 | the vector @var{location} with pointers to the symbols and |
| 354 | a trailing NULL. |
| 355 | Return the actual number of symbol pointers, not |
| 356 | including the NULL. |
| 357 | |
| 358 | |
| 359 | .#define bfd_canonicalize_symtab(abfd, location) \ |
| 360 | . BFD_SEND (abfd, _bfd_canonicalize_symtab,\ |
| 361 | . (abfd, location)) |
| 362 | |
| 363 | */ |
| 364 | |
| 365 | |
| 366 | /* |
| 367 | FUNCTION |
| 368 | bfd_set_symtab |
| 369 | |
| 370 | SYNOPSIS |
| 371 | boolean bfd_set_symtab (bfd *abfd, asymbol **location, unsigned int count); |
| 372 | |
| 373 | DESCRIPTION |
| 374 | Arrange that when the output BFD @var{abfd} is closed, |
| 375 | the table @var{location} of @var{count} pointers to symbols |
| 376 | will be written. |
| 377 | */ |
| 378 | |
| 379 | boolean |
| 380 | bfd_set_symtab (abfd, location, symcount) |
| 381 | bfd *abfd; |
| 382 | asymbol **location; |
| 383 | unsigned int symcount; |
| 384 | { |
| 385 | if ((abfd->format != bfd_object) || (bfd_read_p (abfd))) |
| 386 | { |
| 387 | bfd_set_error (bfd_error_invalid_operation); |
| 388 | return false; |
| 389 | } |
| 390 | |
| 391 | bfd_get_outsymbols (abfd) = location; |
| 392 | bfd_get_symcount (abfd) = symcount; |
| 393 | return true; |
| 394 | } |
| 395 | |
| 396 | /* |
| 397 | FUNCTION |
| 398 | bfd_print_symbol_vandf |
| 399 | |
| 400 | SYNOPSIS |
| 401 | void bfd_print_symbol_vandf(PTR file, asymbol *symbol); |
| 402 | |
| 403 | DESCRIPTION |
| 404 | Print the value and flags of the @var{symbol} supplied to the |
| 405 | stream @var{file}. |
| 406 | */ |
| 407 | void |
| 408 | bfd_print_symbol_vandf (arg, symbol) |
| 409 | PTR arg; |
| 410 | asymbol *symbol; |
| 411 | { |
| 412 | FILE *file = (FILE *) arg; |
| 413 | flagword type = symbol->flags; |
| 414 | if (symbol->section != (asection *) NULL) |
| 415 | { |
| 416 | fprintf_vma (file, symbol->value + symbol->section->vma); |
| 417 | } |
| 418 | else |
| 419 | { |
| 420 | fprintf_vma (file, symbol->value); |
| 421 | } |
| 422 | |
| 423 | /* This presumes that a symbol can not be both BSF_DEBUGGING and |
| 424 | BSF_DYNAMIC, nor more than one of BSF_FUNCTION, BSF_FILE, and |
| 425 | BSF_OBJECT. */ |
| 426 | fprintf (file, " %c%c%c%c%c%c%c", |
| 427 | ((type & BSF_LOCAL) |
| 428 | ? (type & BSF_GLOBAL) ? '!' : 'l' |
| 429 | : (type & BSF_GLOBAL) ? 'g' : ' '), |
| 430 | (type & BSF_WEAK) ? 'w' : ' ', |
| 431 | (type & BSF_CONSTRUCTOR) ? 'C' : ' ', |
| 432 | (type & BSF_WARNING) ? 'W' : ' ', |
| 433 | (type & BSF_INDIRECT) ? 'I' : ' ', |
| 434 | (type & BSF_DEBUGGING) ? 'd' : (type & BSF_DYNAMIC) ? 'D' : ' ', |
| 435 | ((type & BSF_FUNCTION) |
| 436 | ? 'F' |
| 437 | : ((type & BSF_FILE) |
| 438 | ? 'f' |
| 439 | : ((type & BSF_OBJECT) ? 'O' : ' ')))); |
| 440 | } |
| 441 | |
| 442 | |
| 443 | /* |
| 444 | FUNCTION |
| 445 | bfd_make_empty_symbol |
| 446 | |
| 447 | DESCRIPTION |
| 448 | Create a new <<asymbol>> structure for the BFD @var{abfd} |
| 449 | and return a pointer to it. |
| 450 | |
| 451 | This routine is necessary because each back end has private |
| 452 | information surrounding the <<asymbol>>. Building your own |
| 453 | <<asymbol>> and pointing to it will not create the private |
| 454 | information, and will cause problems later on. |
| 455 | |
| 456 | .#define bfd_make_empty_symbol(abfd) \ |
| 457 | . BFD_SEND (abfd, _bfd_make_empty_symbol, (abfd)) |
| 458 | */ |
| 459 | |
| 460 | /* |
| 461 | FUNCTION |
| 462 | bfd_make_debug_symbol |
| 463 | |
| 464 | DESCRIPTION |
| 465 | Create a new <<asymbol>> structure for the BFD @var{abfd}, |
| 466 | to be used as a debugging symbol. Further details of its use have |
| 467 | yet to be worked out. |
| 468 | |
| 469 | .#define bfd_make_debug_symbol(abfd,ptr,size) \ |
| 470 | . BFD_SEND (abfd, _bfd_make_debug_symbol, (abfd, ptr, size)) |
| 471 | */ |
| 472 | |
| 473 | struct section_to_type |
| 474 | { |
| 475 | CONST char *section; |
| 476 | char type; |
| 477 | }; |
| 478 | |
| 479 | /* Map section names to POSIX/BSD single-character symbol types. |
| 480 | This table is probably incomplete. It is sorted for convenience of |
| 481 | adding entries. Since it is so short, a linear search is used. */ |
| 482 | static CONST struct section_to_type stt[] = |
| 483 | { |
| 484 | {"*DEBUG*", 'N'}, |
| 485 | {".bss", 'b'}, |
| 486 | {".data", 'd'}, |
| 487 | {".rdata", 'r'}, /* Read only data. */ |
| 488 | {".rodata", 'r'}, /* Read only data. */ |
| 489 | {".sbss", 's'}, /* Small BSS (uninitialized data). */ |
| 490 | {".scommon", 'c'}, /* Small common. */ |
| 491 | {".sdata", 'g'}, /* Small initialized data. */ |
| 492 | {".text", 't'}, |
| 493 | {0, 0} |
| 494 | }; |
| 495 | |
| 496 | /* Return the single-character symbol type corresponding to |
| 497 | section S, or '?' for an unknown COFF section. |
| 498 | |
| 499 | Check for any leading string which matches, so .text5 returns |
| 500 | 't' as well as .text */ |
| 501 | |
| 502 | static char |
| 503 | coff_section_type (s) |
| 504 | char *s; |
| 505 | { |
| 506 | CONST struct section_to_type *t; |
| 507 | |
| 508 | for (t = &stt[0]; t->section; t++) |
| 509 | if (!strncmp (s, t->section, strlen (t->section))) |
| 510 | return t->type; |
| 511 | |
| 512 | return '?'; |
| 513 | } |
| 514 | |
| 515 | #ifndef islower |
| 516 | #define islower(c) ((c) >= 'a' && (c) <= 'z') |
| 517 | #endif |
| 518 | #ifndef toupper |
| 519 | #define toupper(c) (islower(c) ? ((c) & ~0x20) : (c)) |
| 520 | #endif |
| 521 | |
| 522 | /* |
| 523 | FUNCTION |
| 524 | bfd_decode_symclass |
| 525 | |
| 526 | DESCRIPTION |
| 527 | Return a character corresponding to the symbol |
| 528 | class of @var{symbol}, or '?' for an unknown class. |
| 529 | |
| 530 | SYNOPSIS |
| 531 | int bfd_decode_symclass(asymbol *symbol); |
| 532 | */ |
| 533 | int |
| 534 | bfd_decode_symclass (symbol) |
| 535 | asymbol *symbol; |
| 536 | { |
| 537 | char c; |
| 538 | |
| 539 | if (bfd_is_com_section (symbol->section)) |
| 540 | return 'C'; |
| 541 | if (bfd_is_und_section (symbol->section)) |
| 542 | return 'U'; |
| 543 | if (bfd_is_ind_section (symbol->section)) |
| 544 | return 'I'; |
| 545 | if (symbol->flags & BSF_WEAK) |
| 546 | return 'W'; |
| 547 | if (!(symbol->flags & (BSF_GLOBAL | BSF_LOCAL))) |
| 548 | return '?'; |
| 549 | |
| 550 | if (bfd_is_abs_section (symbol->section)) |
| 551 | c = 'a'; |
| 552 | else if (symbol->section) |
| 553 | c = coff_section_type (symbol->section->name); |
| 554 | else |
| 555 | return '?'; |
| 556 | if (symbol->flags & BSF_GLOBAL) |
| 557 | c = toupper (c); |
| 558 | return c; |
| 559 | |
| 560 | /* We don't have to handle these cases just yet, but we will soon: |
| 561 | N_SETV: 'v'; |
| 562 | N_SETA: 'l'; |
| 563 | N_SETT: 'x'; |
| 564 | N_SETD: 'z'; |
| 565 | N_SETB: 's'; |
| 566 | N_INDR: 'i'; |
| 567 | */ |
| 568 | } |
| 569 | |
| 570 | /* |
| 571 | FUNCTION |
| 572 | bfd_symbol_info |
| 573 | |
| 574 | DESCRIPTION |
| 575 | Fill in the basic info about symbol that nm needs. |
| 576 | Additional info may be added by the back-ends after |
| 577 | calling this function. |
| 578 | |
| 579 | SYNOPSIS |
| 580 | void bfd_symbol_info(asymbol *symbol, symbol_info *ret); |
| 581 | */ |
| 582 | |
| 583 | void |
| 584 | bfd_symbol_info (symbol, ret) |
| 585 | asymbol *symbol; |
| 586 | symbol_info *ret; |
| 587 | { |
| 588 | ret->type = bfd_decode_symclass (symbol); |
| 589 | if (ret->type != 'U') |
| 590 | ret->value = symbol->value + symbol->section->vma; |
| 591 | else |
| 592 | ret->value = 0; |
| 593 | ret->name = symbol->name; |
| 594 | } |
| 595 | |
| 596 | void |
| 597 | bfd_symbol_is_absolute () |
| 598 | { |
| 599 | abort (); |
| 600 | } |
| 601 | |
| 602 | /* |
| 603 | FUNCTION |
| 604 | bfd_copy_private_symbol_data |
| 605 | |
| 606 | SYNOPSIS |
| 607 | boolean bfd_copy_private_symbol_data(bfd *ibfd, asymbol *isym, bfd *obfd, asymbol *osym); |
| 608 | |
| 609 | DESCRIPTION |
| 610 | Copy private symbol information from @var{isym} in the BFD |
| 611 | @var{ibfd} to the symbol @var{osym} in the BFD @var{obfd}. |
| 612 | Return <<true>> on success, <<false>> on error. Possible error |
| 613 | returns are: |
| 614 | |
| 615 | o <<bfd_error_no_memory>> - |
| 616 | Not enough memory exists to create private data for @var{osec}. |
| 617 | |
| 618 | .#define bfd_copy_private_symbol_data(ibfd, isymbol, obfd, osymbol) \ |
| 619 | . BFD_SEND (ibfd, _bfd_copy_private_symbol_data, \ |
| 620 | . (ibfd, isymbol, obfd, osymbol)) |
| 621 | |
| 622 | */ |
| 623 | |
| 624 | /* The generic version of the function which returns mini symbols. |
| 625 | This is used when the backend does not provide a more efficient |
| 626 | version. It just uses BFD asymbol structures as mini symbols. */ |
| 627 | |
| 628 | long |
| 629 | _bfd_generic_read_minisymbols (abfd, dynamic, minisymsp, sizep) |
| 630 | bfd *abfd; |
| 631 | boolean dynamic; |
| 632 | PTR *minisymsp; |
| 633 | unsigned int *sizep; |
| 634 | { |
| 635 | long storage; |
| 636 | asymbol **syms = NULL; |
| 637 | long symcount; |
| 638 | |
| 639 | if (dynamic) |
| 640 | storage = bfd_get_dynamic_symtab_upper_bound (abfd); |
| 641 | else |
| 642 | storage = bfd_get_symtab_upper_bound (abfd); |
| 643 | if (storage < 0) |
| 644 | goto error_return; |
| 645 | |
| 646 | syms = (asymbol **) bfd_malloc ((size_t) storage); |
| 647 | if (syms == NULL) |
| 648 | goto error_return; |
| 649 | |
| 650 | if (dynamic) |
| 651 | symcount = bfd_canonicalize_dynamic_symtab (abfd, syms); |
| 652 | else |
| 653 | symcount = bfd_canonicalize_symtab (abfd, syms); |
| 654 | if (symcount < 0) |
| 655 | goto error_return; |
| 656 | |
| 657 | *minisymsp = (PTR) syms; |
| 658 | *sizep = sizeof (asymbol *); |
| 659 | return symcount; |
| 660 | |
| 661 | error_return: |
| 662 | if (syms != NULL) |
| 663 | free (syms); |
| 664 | return -1; |
| 665 | } |
| 666 | |
| 667 | /* The generic version of the function which converts a minisymbol to |
| 668 | an asymbol. We don't worry about the sym argument we are passed; |
| 669 | we just return the asymbol the minisymbol points to. */ |
| 670 | |
| 671 | /*ARGSUSED*/ |
| 672 | asymbol * |
| 673 | _bfd_generic_minisymbol_to_symbol (abfd, dynamic, minisym, sym) |
| 674 | bfd *abfd; |
| 675 | boolean dynamic; |
| 676 | const PTR minisym; |
| 677 | asymbol *sym; |
| 678 | { |
| 679 | return *(asymbol **) minisym; |
| 680 | } |
| 681 | |
| 682 | /* Look through stabs debugging information in .stab and .stabstr |
| 683 | sections to find the source file and line closest to a desired |
| 684 | location. This is used by COFF and ELF targets. It sets *pfound |
| 685 | to true if it finds some information. The *pinfo field is used to |
| 686 | pass cached information in and out of this routine; this first time |
| 687 | the routine is called for a BFD, *pinfo should be NULL. The value |
| 688 | placed in *pinfo should be saved with the BFD, and passed back each |
| 689 | time this function is called. */ |
| 690 | |
| 691 | /* A pointer to this structure is stored in *pinfo. */ |
| 692 | |
| 693 | struct stab_find_info |
| 694 | { |
| 695 | /* The .stab section. */ |
| 696 | asection *stabsec; |
| 697 | /* The .stabstr section. */ |
| 698 | asection *strsec; |
| 699 | /* The contents of the .stab section. */ |
| 700 | bfd_byte *stabs; |
| 701 | /* The contents of the .stabstr section. */ |
| 702 | bfd_byte *strs; |
| 703 | /* An malloc buffer to hold the file name. */ |
| 704 | char *filename; |
| 705 | /* Cached values to restart quickly. */ |
| 706 | bfd_vma cached_offset; |
| 707 | bfd_byte *cached_stab; |
| 708 | bfd_byte *cached_str; |
| 709 | bfd_size_type cached_stroff; |
| 710 | }; |
| 711 | |
| 712 | boolean |
| 713 | _bfd_stab_section_find_nearest_line (abfd, symbols, section, offset, pfound, |
| 714 | pfilename, pfnname, pline, pinfo) |
| 715 | bfd *abfd; |
| 716 | asymbol **symbols; |
| 717 | asection *section; |
| 718 | bfd_vma offset; |
| 719 | boolean *pfound; |
| 720 | const char **pfilename; |
| 721 | const char **pfnname; |
| 722 | unsigned int *pline; |
| 723 | PTR *pinfo; |
| 724 | { |
| 725 | struct stab_find_info *info; |
| 726 | bfd_size_type stabsize, strsize; |
| 727 | bfd_byte *stab, *stabend, *str; |
| 728 | bfd_size_type stroff; |
| 729 | bfd_vma fnaddr; |
| 730 | char *directory_name, *main_file_name, *current_file_name, *line_file_name; |
| 731 | char *fnname; |
| 732 | bfd_vma low_func_vma, low_line_vma; |
| 733 | |
| 734 | *pfound = false; |
| 735 | *pfilename = bfd_get_filename (abfd); |
| 736 | *pfnname = NULL; |
| 737 | *pline = 0; |
| 738 | |
| 739 | info = (struct stab_find_info *) *pinfo; |
| 740 | if (info != NULL) |
| 741 | { |
| 742 | if (info->stabsec == NULL || info->strsec == NULL) |
| 743 | { |
| 744 | /* No stabs debugging information. */ |
| 745 | return true; |
| 746 | } |
| 747 | |
| 748 | stabsize = info->stabsec->_raw_size; |
| 749 | strsize = info->strsec->_raw_size; |
| 750 | } |
| 751 | else |
| 752 | { |
| 753 | long reloc_size, reloc_count; |
| 754 | arelent **reloc_vector; |
| 755 | |
| 756 | info = (struct stab_find_info *) bfd_zalloc (abfd, sizeof *info); |
| 757 | if (info == NULL) |
| 758 | return false; |
| 759 | |
| 760 | /* FIXME: When using the linker --split-by-file or |
| 761 | --split-by-reloc options, it is possible for the .stab and |
| 762 | .stabstr sections to be split. We should handle that. */ |
| 763 | |
| 764 | info->stabsec = bfd_get_section_by_name (abfd, ".stab"); |
| 765 | info->strsec = bfd_get_section_by_name (abfd, ".stabstr"); |
| 766 | |
| 767 | if (info->stabsec == NULL || info->strsec == NULL) |
| 768 | { |
| 769 | /* No stabs debugging information. Set *pinfo so that we |
| 770 | can return quickly in the info != NULL case above. */ |
| 771 | *pinfo = info; |
| 772 | return true; |
| 773 | } |
| 774 | |
| 775 | stabsize = info->stabsec->_raw_size; |
| 776 | strsize = info->strsec->_raw_size; |
| 777 | |
| 778 | info->stabs = (bfd_byte *) bfd_alloc (abfd, stabsize); |
| 779 | info->strs = (bfd_byte *) bfd_alloc (abfd, strsize); |
| 780 | if (info->stabs == NULL || info->strs == NULL) |
| 781 | return false; |
| 782 | |
| 783 | if (! bfd_get_section_contents (abfd, info->stabsec, info->stabs, 0, |
| 784 | stabsize) |
| 785 | || ! bfd_get_section_contents (abfd, info->strsec, info->strs, 0, |
| 786 | strsize)) |
| 787 | return false; |
| 788 | |
| 789 | /* If this is a relocateable object file, we have to relocate |
| 790 | the entries in .stab. This should always be simple 32 bit |
| 791 | relocations against symbols defined in this object file, so |
| 792 | this should be no big deal. */ |
| 793 | reloc_size = bfd_get_reloc_upper_bound (abfd, info->stabsec); |
| 794 | if (reloc_size < 0) |
| 795 | return false; |
| 796 | reloc_vector = (arelent **) bfd_malloc (reloc_size); |
| 797 | if (reloc_vector == NULL && reloc_size != 0) |
| 798 | return false; |
| 799 | reloc_count = bfd_canonicalize_reloc (abfd, info->stabsec, reloc_vector, |
| 800 | symbols); |
| 801 | if (reloc_count < 0) |
| 802 | { |
| 803 | if (reloc_vector != NULL) |
| 804 | free (reloc_vector); |
| 805 | return false; |
| 806 | } |
| 807 | if (reloc_count > 0) |
| 808 | { |
| 809 | arelent **pr; |
| 810 | |
| 811 | for (pr = reloc_vector; *pr != NULL; pr++) |
| 812 | { |
| 813 | arelent *r; |
| 814 | unsigned long val; |
| 815 | asymbol *sym; |
| 816 | |
| 817 | r = *pr; |
| 818 | if (r->howto->rightshift != 0 |
| 819 | || r->howto->size != 2 |
| 820 | || r->howto->bitsize != 32 |
| 821 | || r->howto->pc_relative |
| 822 | || r->howto->bitpos != 0 |
| 823 | || r->howto->dst_mask != 0xffffffff) |
| 824 | { |
| 825 | (*_bfd_error_handler) |
| 826 | ("Unsupported .stab relocation"); |
| 827 | bfd_set_error (bfd_error_invalid_operation); |
| 828 | if (reloc_vector != NULL) |
| 829 | free (reloc_vector); |
| 830 | return false; |
| 831 | } |
| 832 | |
| 833 | val = bfd_get_32 (abfd, info->stabs + r->address); |
| 834 | val &= r->howto->src_mask; |
| 835 | sym = *r->sym_ptr_ptr; |
| 836 | val += sym->value + sym->section->vma + r->addend; |
| 837 | bfd_put_32 (abfd, val, info->stabs + r->address); |
| 838 | } |
| 839 | } |
| 840 | |
| 841 | if (reloc_vector != NULL) |
| 842 | free (reloc_vector); |
| 843 | |
| 844 | *pinfo = info; |
| 845 | } |
| 846 | |
| 847 | /* We are passed a section relative offset. The offsets in the |
| 848 | stabs information are absolute. */ |
| 849 | offset += bfd_get_section_vma (abfd, section); |
| 850 | |
| 851 | /* Stabs entries use a 12 byte format: |
| 852 | 4 byte string table index |
| 853 | 1 byte stab type |
| 854 | 1 byte stab other field |
| 855 | 2 byte stab desc field |
| 856 | 4 byte stab value |
| 857 | FIXME: This will have to change for a 64 bit object format. |
| 858 | |
| 859 | The stabs symbols are divided into compilation units. For the |
| 860 | first entry in each unit, the type of 0, the value is the length |
| 861 | of the string table for this unit, and the desc field is the |
| 862 | number of stabs symbols for this unit. */ |
| 863 | |
| 864 | #define STRDXOFF (0) |
| 865 | #define TYPEOFF (4) |
| 866 | #define OTHEROFF (5) |
| 867 | #define DESCOFF (6) |
| 868 | #define VALOFF (8) |
| 869 | #define STABSIZE (12) |
| 870 | |
| 871 | /* It would be nice if we could skip ahead to the stabs symbols for |
| 872 | the next compilation unit to quickly scan through the compilation |
| 873 | units. Unfortunately, since each line number gets a separate |
| 874 | stabs entry, it is entirely plausible that a large source file |
| 875 | will overflow the 16 bit count of stabs entries. */ |
| 876 | fnaddr = 0; |
| 877 | directory_name = NULL; |
| 878 | main_file_name = NULL; |
| 879 | current_file_name = NULL; |
| 880 | line_file_name = NULL; |
| 881 | fnname = NULL; |
| 882 | low_func_vma = 0; |
| 883 | low_line_vma = 0; |
| 884 | |
| 885 | stabend = info->stabs + stabsize; |
| 886 | |
| 887 | if (info->cached_stab == NULL || offset < info->cached_offset) |
| 888 | { |
| 889 | stab = info->stabs; |
| 890 | str = info->strs; |
| 891 | stroff = 0; |
| 892 | } |
| 893 | else |
| 894 | { |
| 895 | stab = info->cached_stab; |
| 896 | str = info->cached_str; |
| 897 | stroff = info->cached_stroff; |
| 898 | } |
| 899 | |
| 900 | info->cached_offset = offset; |
| 901 | |
| 902 | for (; stab < stabend; stab += STABSIZE) |
| 903 | { |
| 904 | boolean done; |
| 905 | bfd_vma val; |
| 906 | char *name; |
| 907 | |
| 908 | done = false; |
| 909 | |
| 910 | switch (stab[TYPEOFF]) |
| 911 | { |
| 912 | case 0: |
| 913 | /* This is the first entry in a compilation unit. */ |
| 914 | if ((bfd_size_type) ((info->strs + strsize) - str) < stroff) |
| 915 | { |
| 916 | done = true; |
| 917 | break; |
| 918 | } |
| 919 | str += stroff; |
| 920 | stroff = bfd_get_32 (abfd, stab + VALOFF); |
| 921 | break; |
| 922 | |
| 923 | case N_SO: |
| 924 | /* The main file name. */ |
| 925 | |
| 926 | val = bfd_get_32 (abfd, stab + VALOFF); |
| 927 | if (val > offset) |
| 928 | { |
| 929 | done = true; |
| 930 | break; |
| 931 | } |
| 932 | |
| 933 | name = str + bfd_get_32 (abfd, stab + STRDXOFF); |
| 934 | |
| 935 | /* An empty string indicates the end of the compilation |
| 936 | unit. */ |
| 937 | if (*name == '\0') |
| 938 | { |
| 939 | /* If there are functions in different sections, they |
| 940 | may have addresses larger than val, but we don't want |
| 941 | to forget the file name. When there are functions in |
| 942 | different cases, there is supposed to be an N_FUN at |
| 943 | the end of the function indicating where it ends. */ |
| 944 | if (low_func_vma < val || fnname == NULL) |
| 945 | main_file_name = NULL; |
| 946 | break; |
| 947 | } |
| 948 | |
| 949 | /* We know that we have to get to at least this point in the |
| 950 | stabs entries for this offset. */ |
| 951 | info->cached_stab = stab; |
| 952 | info->cached_str = str; |
| 953 | info->cached_stroff = stroff; |
| 954 | |
| 955 | current_file_name = name; |
| 956 | |
| 957 | /* Look ahead to the next symbol. Two consecutive N_SO |
| 958 | symbols are a directory and a file name. */ |
| 959 | if (stab + STABSIZE >= stabend |
| 960 | || *(stab + STABSIZE + TYPEOFF) != N_SO) |
| 961 | directory_name = NULL; |
| 962 | else |
| 963 | { |
| 964 | stab += STABSIZE; |
| 965 | directory_name = current_file_name; |
| 966 | current_file_name = str + bfd_get_32 (abfd, stab + STRDXOFF); |
| 967 | } |
| 968 | |
| 969 | main_file_name = current_file_name; |
| 970 | |
| 971 | break; |
| 972 | |
| 973 | case N_SOL: |
| 974 | /* The name of an include file. */ |
| 975 | current_file_name = str + bfd_get_32 (abfd, stab + STRDXOFF); |
| 976 | break; |
| 977 | |
| 978 | case N_SLINE: |
| 979 | case N_DSLINE: |
| 980 | case N_BSLINE: |
| 981 | /* A line number. The value is relative to the start of the |
| 982 | current function. */ |
| 983 | val = fnaddr + bfd_get_32 (abfd, stab + VALOFF); |
| 984 | if (val >= low_line_vma && val <= offset) |
| 985 | { |
| 986 | *pline = bfd_get_16 (abfd, stab + DESCOFF); |
| 987 | low_line_vma = val; |
| 988 | line_file_name = current_file_name; |
| 989 | } |
| 990 | break; |
| 991 | |
| 992 | case N_FUN: |
| 993 | /* A function name. */ |
| 994 | val = bfd_get_32 (abfd, stab + VALOFF); |
| 995 | name = str + bfd_get_32 (abfd, stab + STRDXOFF); |
| 996 | |
| 997 | /* An empty string here indicates the end of a function, and |
| 998 | the value is relative to fnaddr. */ |
| 999 | |
| 1000 | if (*name == '\0') |
| 1001 | { |
| 1002 | val += fnaddr; |
| 1003 | if (val >= low_func_vma && val < offset) |
| 1004 | fnname = NULL; |
| 1005 | } |
| 1006 | else |
| 1007 | { |
| 1008 | if (val >= low_func_vma && val <= offset) |
| 1009 | { |
| 1010 | fnname = name; |
| 1011 | low_func_vma = val; |
| 1012 | } |
| 1013 | |
| 1014 | fnaddr = val; |
| 1015 | } |
| 1016 | |
| 1017 | break; |
| 1018 | } |
| 1019 | |
| 1020 | if (done) |
| 1021 | break; |
| 1022 | } |
| 1023 | |
| 1024 | if (main_file_name == NULL) |
| 1025 | { |
| 1026 | /* No information found. */ |
| 1027 | return true; |
| 1028 | } |
| 1029 | |
| 1030 | *pfound = true; |
| 1031 | |
| 1032 | if (*pline != 0) |
| 1033 | main_file_name = line_file_name; |
| 1034 | |
| 1035 | if (main_file_name != NULL) |
| 1036 | { |
| 1037 | if (main_file_name[0] == '/' || directory_name == NULL) |
| 1038 | *pfilename = main_file_name; |
| 1039 | else |
| 1040 | { |
| 1041 | size_t dirlen; |
| 1042 | |
| 1043 | dirlen = strlen (directory_name); |
| 1044 | if (info->filename == NULL |
| 1045 | || strncmp (info->filename, directory_name, dirlen) != 0 |
| 1046 | || strcmp (info->filename + dirlen, main_file_name) != 0) |
| 1047 | { |
| 1048 | if (info->filename != NULL) |
| 1049 | free (info->filename); |
| 1050 | info->filename = (char *) bfd_malloc (dirlen + |
| 1051 | strlen (main_file_name) |
| 1052 | + 1); |
| 1053 | if (info->filename == NULL) |
| 1054 | return false; |
| 1055 | strcpy (info->filename, directory_name); |
| 1056 | strcpy (info->filename + dirlen, main_file_name); |
| 1057 | } |
| 1058 | |
| 1059 | *pfilename = info->filename; |
| 1060 | } |
| 1061 | } |
| 1062 | |
| 1063 | if (fnname != NULL) |
| 1064 | { |
| 1065 | char *s; |
| 1066 | |
| 1067 | /* This will typically be something like main:F(0,1), so we want |
| 1068 | to clobber the colon. It's OK to change the name, since the |
| 1069 | string is in our own local storage anyhow. */ |
| 1070 | |
| 1071 | s = strchr (fnname, ':'); |
| 1072 | if (s != NULL) |
| 1073 | *s = '\0'; |
| 1074 | |
| 1075 | *pfnname = fnname; |
| 1076 | } |
| 1077 | |
| 1078 | return true; |
| 1079 | } |