| 1 | /* bfdlink.h -- header file for BFD link routines |
| 2 | Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000 |
| 3 | Free Software Foundation, Inc. |
| 4 | Written by Steve Chamberlain and Ian Lance Taylor, Cygnus Support. |
| 5 | |
| 6 | This file is part of BFD, the Binary File Descriptor library. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 2 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | #ifndef BFDLINK_H |
| 23 | #define BFDLINK_H |
| 24 | |
| 25 | /* Which symbols to strip during a link. */ |
| 26 | enum bfd_link_strip |
| 27 | { |
| 28 | strip_none, /* Don't strip any symbols. */ |
| 29 | strip_debugger, /* Strip debugging symbols. */ |
| 30 | strip_some, /* keep_hash is the list of symbols to keep. */ |
| 31 | strip_all /* Strip all symbols. */ |
| 32 | }; |
| 33 | |
| 34 | /* Which local symbols to discard during a link. This is irrelevant |
| 35 | if strip_all is used. */ |
| 36 | enum bfd_link_discard |
| 37 | { |
| 38 | discard_sec_merge, /* Discard local temporary symbols in SEC_MERGE |
| 39 | sections. */ |
| 40 | discard_none, /* Don't discard any locals. */ |
| 41 | discard_l, /* Discard local temporary symbols. */ |
| 42 | discard_all /* Discard all locals. */ |
| 43 | }; |
| 44 | |
| 45 | /* Describes the type of hash table entry structure being used. |
| 46 | Different hash table structure have different fields and so |
| 47 | support different linking features. */ |
| 48 | enum bfd_link_hash_table_type |
| 49 | { |
| 50 | bfd_link_generic_hash_table, |
| 51 | bfd_link_elf_hash_table |
| 52 | }; |
| 53 | \f |
| 54 | /* These are the possible types of an entry in the BFD link hash |
| 55 | table. */ |
| 56 | |
| 57 | enum bfd_link_hash_type |
| 58 | { |
| 59 | bfd_link_hash_new, /* Symbol is new. */ |
| 60 | bfd_link_hash_undefined, /* Symbol seen before, but undefined. */ |
| 61 | bfd_link_hash_undefweak, /* Symbol is weak and undefined. */ |
| 62 | bfd_link_hash_defined, /* Symbol is defined. */ |
| 63 | bfd_link_hash_defweak, /* Symbol is weak and defined. */ |
| 64 | bfd_link_hash_common, /* Symbol is common. */ |
| 65 | bfd_link_hash_indirect, /* Symbol is an indirect link. */ |
| 66 | bfd_link_hash_warning /* Like indirect, but warn if referenced. */ |
| 67 | }; |
| 68 | |
| 69 | /* The linking routines use a hash table which uses this structure for |
| 70 | its elements. */ |
| 71 | |
| 72 | struct bfd_link_hash_entry |
| 73 | { |
| 74 | /* Base hash table entry structure. */ |
| 75 | struct bfd_hash_entry root; |
| 76 | /* Type of this entry. */ |
| 77 | enum bfd_link_hash_type type; |
| 78 | |
| 79 | /* Undefined and common symbols are kept in a linked list through |
| 80 | this field. This field is not in the union because that would |
| 81 | force us to remove entries from the list when we changed their |
| 82 | type, which would force the list to be doubly linked, which would |
| 83 | waste more memory. When an undefined or common symbol is |
| 84 | created, it should be added to this list, the head of which is in |
| 85 | the link hash table itself. As symbols are defined, they need |
| 86 | not be removed from the list; anything which reads the list must |
| 87 | doublecheck the symbol type. |
| 88 | |
| 89 | Weak symbols are not kept on this list. |
| 90 | |
| 91 | Defined and defweak symbols use this field as a reference marker. |
| 92 | If the field is not NULL, or this structure is the tail of the |
| 93 | undefined symbol list, the symbol has been referenced. If the |
| 94 | symbol is undefined and becomes defined, this field will |
| 95 | automatically be non-NULL since the symbol will have been on the |
| 96 | undefined symbol list. */ |
| 97 | struct bfd_link_hash_entry *next; |
| 98 | /* A union of information depending upon the type. */ |
| 99 | union |
| 100 | { |
| 101 | /* Nothing is kept for bfd_hash_new. */ |
| 102 | /* bfd_link_hash_undefined, bfd_link_hash_undefweak. */ |
| 103 | struct |
| 104 | { |
| 105 | bfd *abfd; /* BFD symbol was found in. */ |
| 106 | } undef; |
| 107 | /* bfd_link_hash_defined, bfd_link_hash_defweak. */ |
| 108 | struct |
| 109 | { |
| 110 | bfd_vma value; /* Symbol value. */ |
| 111 | asection *section; /* Symbol section. */ |
| 112 | } def; |
| 113 | /* bfd_link_hash_indirect, bfd_link_hash_warning. */ |
| 114 | struct |
| 115 | { |
| 116 | struct bfd_link_hash_entry *link; /* Real symbol. */ |
| 117 | const char *warning; /* Warning (bfd_link_hash_warning only). */ |
| 118 | } i; |
| 119 | /* bfd_link_hash_common. */ |
| 120 | struct |
| 121 | { |
| 122 | /* The linker needs to know three things about common |
| 123 | symbols: the size, the alignment, and the section in |
| 124 | which the symbol should be placed. We store the size |
| 125 | here, and we allocate a small structure to hold the |
| 126 | section and the alignment. The alignment is stored as a |
| 127 | power of two. We don't store all the information |
| 128 | directly because we don't want to increase the size of |
| 129 | the union; this structure is a major space user in the |
| 130 | linker. */ |
| 131 | bfd_size_type size; /* Common symbol size. */ |
| 132 | struct bfd_link_hash_common_entry |
| 133 | { |
| 134 | unsigned int alignment_power; /* Alignment. */ |
| 135 | asection *section; /* Symbol section. */ |
| 136 | } *p; |
| 137 | } c; |
| 138 | } u; |
| 139 | }; |
| 140 | |
| 141 | /* This is the link hash table. It is a derived class of |
| 142 | bfd_hash_table. */ |
| 143 | |
| 144 | struct bfd_link_hash_table |
| 145 | { |
| 146 | /* The hash table itself. */ |
| 147 | struct bfd_hash_table table; |
| 148 | /* The back end which created this hash table. This indicates the |
| 149 | type of the entries in the hash table, which is sometimes |
| 150 | important information when linking object files of different |
| 151 | types together. */ |
| 152 | const bfd_target *creator; |
| 153 | /* A linked list of undefined and common symbols, linked through the |
| 154 | next field in the bfd_link_hash_entry structure. */ |
| 155 | struct bfd_link_hash_entry *undefs; |
| 156 | /* Entries are added to the tail of the undefs list. */ |
| 157 | struct bfd_link_hash_entry *undefs_tail; |
| 158 | /* The type of the ink hash table. */ |
| 159 | enum bfd_link_hash_table_type type; |
| 160 | }; |
| 161 | |
| 162 | /* Look up an entry in a link hash table. If FOLLOW is true, this |
| 163 | follows bfd_link_hash_indirect and bfd_link_hash_warning links to |
| 164 | the real symbol. */ |
| 165 | extern struct bfd_link_hash_entry *bfd_link_hash_lookup |
| 166 | PARAMS ((struct bfd_link_hash_table *, const char *, boolean create, |
| 167 | boolean copy, boolean follow)); |
| 168 | |
| 169 | /* Look up an entry in the main linker hash table if the symbol might |
| 170 | be wrapped. This should only be used for references to an |
| 171 | undefined symbol, not for definitions of a symbol. */ |
| 172 | |
| 173 | extern struct bfd_link_hash_entry *bfd_wrapped_link_hash_lookup |
| 174 | PARAMS ((bfd *, struct bfd_link_info *, const char *, boolean, boolean, |
| 175 | boolean)); |
| 176 | |
| 177 | /* Traverse a link hash table. */ |
| 178 | extern void bfd_link_hash_traverse |
| 179 | PARAMS ((struct bfd_link_hash_table *, |
| 180 | boolean (*) (struct bfd_link_hash_entry *, PTR), |
| 181 | PTR)); |
| 182 | |
| 183 | /* Add an entry to the undefs list. */ |
| 184 | extern void bfd_link_add_undef |
| 185 | PARAMS ((struct bfd_link_hash_table *, struct bfd_link_hash_entry *)); |
| 186 | \f |
| 187 | /* This structure holds all the information needed to communicate |
| 188 | between BFD and the linker when doing a link. */ |
| 189 | |
| 190 | struct bfd_link_info |
| 191 | { |
| 192 | /* Function callbacks. */ |
| 193 | const struct bfd_link_callbacks *callbacks; |
| 194 | /* true if BFD should generate a relocateable object file. */ |
| 195 | boolean relocateable; |
| 196 | /* true if BFD should generate relocation information in the final executable. */ |
| 197 | boolean emitrelocations; |
| 198 | /* true if BFD should generate a "task linked" object file, |
| 199 | similar to relocatable but also with globals converted to statics. */ |
| 200 | boolean task_link; |
| 201 | /* true if BFD should generate a shared object. */ |
| 202 | boolean shared; |
| 203 | /* true if BFD should pre-bind symbols in a shared object. */ |
| 204 | boolean symbolic; |
| 205 | /* true if BFD should export all symbols in the dynamic symbol table |
| 206 | of an executable, rather than only those used. */ |
| 207 | boolean export_dynamic; |
| 208 | /* true if shared objects should be linked directly, not shared. */ |
| 209 | boolean static_link; |
| 210 | /* true if the output file should be in a traditional format. This |
| 211 | is equivalent to the setting of the BFD_TRADITIONAL_FORMAT flag |
| 212 | on the output file, but may be checked when reading the input |
| 213 | files. */ |
| 214 | boolean traditional_format; |
| 215 | /* true if we want to produced optimized output files. This might |
| 216 | need much more time and therefore must be explicitly selected. */ |
| 217 | boolean optimize; |
| 218 | /* true if BFD should generate errors for undefined symbols |
| 219 | even if generating a shared object. */ |
| 220 | boolean no_undefined; |
| 221 | /* true if BFD should allow undefined symbols in shared objects even |
| 222 | when no_undefined is set to disallow undefined symbols. The net |
| 223 | result will be that undefined symbols in regular objects will |
| 224 | still trigger an error, but undefined symbols in shared objects |
| 225 | will be ignored. The implementation of no_undefined makes the |
| 226 | assumption that the runtime linker will choke on undefined |
| 227 | symbols. However there is at least one system (BeOS) where |
| 228 | undefined symbols in shared libraries is normal since the kernel |
| 229 | patches them at load time to select which function is most |
| 230 | appropriate for the current architecture. I.E. dynamically |
| 231 | select an appropriate memset function. Apparently it is also |
| 232 | normal for HPPA shared libraries to have undefined symbols. */ |
| 233 | boolean allow_shlib_undefined; |
| 234 | /* Which symbols to strip. */ |
| 235 | enum bfd_link_strip strip; |
| 236 | /* Which local symbols to discard. */ |
| 237 | enum bfd_link_discard discard; |
| 238 | /* true if symbols should be retained in memory, false if they |
| 239 | should be freed and reread. */ |
| 240 | boolean keep_memory; |
| 241 | /* The list of input BFD's involved in the link. These are chained |
| 242 | together via the link_next field. */ |
| 243 | bfd *input_bfds; |
| 244 | /* If a symbol should be created for each input BFD, this is section |
| 245 | where those symbols should be placed. It must be a section in |
| 246 | the output BFD. It may be NULL, in which case no such symbols |
| 247 | will be created. This is to support CREATE_OBJECT_SYMBOLS in the |
| 248 | linker command language. */ |
| 249 | asection *create_object_symbols_section; |
| 250 | /* Hash table handled by BFD. */ |
| 251 | struct bfd_link_hash_table *hash; |
| 252 | /* Hash table of symbols to keep. This is NULL unless strip is |
| 253 | strip_some. */ |
| 254 | struct bfd_hash_table *keep_hash; |
| 255 | /* true if every symbol should be reported back via the notice |
| 256 | callback. */ |
| 257 | boolean notice_all; |
| 258 | /* Hash table of symbols to report back via the notice callback. If |
| 259 | this is NULL, and notice_all is false, then no symbols are |
| 260 | reported back. */ |
| 261 | struct bfd_hash_table *notice_hash; |
| 262 | /* Hash table of symbols which are being wrapped (the --wrap linker |
| 263 | option). If this is NULL, no symbols are being wrapped. */ |
| 264 | struct bfd_hash_table *wrap_hash; |
| 265 | /* If a base output file is wanted, then this points to it */ |
| 266 | PTR base_file; |
| 267 | |
| 268 | /* If non-zero, specifies that branches which are problematic for the |
| 269 | MPC860 C0 (or earlier) should be checked for and modified. It gives the |
| 270 | number of bytes that should be checked at the end of each text page. */ |
| 271 | int mpc860c0; |
| 272 | |
| 273 | /* The function to call when the executable or shared object is |
| 274 | loaded. */ |
| 275 | const char *init_function; |
| 276 | /* The function to call when the executable or shared object is |
| 277 | unloaded. */ |
| 278 | const char *fini_function; |
| 279 | |
| 280 | /* true if the new ELF dynamic tags are enabled. */ |
| 281 | boolean new_dtags; |
| 282 | |
| 283 | /* May be used to set DT_FLAGS for ELF. */ |
| 284 | bfd_vma flags; |
| 285 | |
| 286 | /* May be used to set DT_FLAGS_1 for ELF. */ |
| 287 | bfd_vma flags_1; |
| 288 | |
| 289 | /* True if auto-import thunks for DATA items in pei386 DLLs |
| 290 | should be generated/linked against. */ |
| 291 | boolean pei386_auto_import; |
| 292 | |
| 293 | /* True if non-PLT relocs should be merged into one reloc section |
| 294 | and sorted so that relocs against the same symbol come together. */ |
| 295 | boolean combreloc; |
| 296 | |
| 297 | /* How many spare .dynamic DT_NULL entries should be added? */ |
| 298 | int spare_dynamic_tags; |
| 299 | }; |
| 300 | |
| 301 | /* This structures holds a set of callback functions. These are |
| 302 | called by the BFD linker routines. The first argument to each |
| 303 | callback function is the bfd_link_info structure being used. Each |
| 304 | function returns a boolean value. If the function returns false, |
| 305 | then the BFD function which called it will return with a failure |
| 306 | indication. */ |
| 307 | |
| 308 | struct bfd_link_callbacks |
| 309 | { |
| 310 | /* A function which is called when an object is added from an |
| 311 | archive. ABFD is the archive element being added. NAME is the |
| 312 | name of the symbol which caused the archive element to be pulled |
| 313 | in. */ |
| 314 | boolean (*add_archive_element) PARAMS ((struct bfd_link_info *, |
| 315 | bfd *abfd, |
| 316 | const char *name)); |
| 317 | /* A function which is called when a symbol is found with multiple |
| 318 | definitions. NAME is the symbol which is defined multiple times. |
| 319 | OBFD is the old BFD, OSEC is the old section, OVAL is the old |
| 320 | value, NBFD is the new BFD, NSEC is the new section, and NVAL is |
| 321 | the new value. OBFD may be NULL. OSEC and NSEC may be |
| 322 | bfd_com_section or bfd_ind_section. */ |
| 323 | boolean (*multiple_definition) PARAMS ((struct bfd_link_info *, |
| 324 | const char *name, |
| 325 | bfd *obfd, |
| 326 | asection *osec, |
| 327 | bfd_vma oval, |
| 328 | bfd *nbfd, |
| 329 | asection *nsec, |
| 330 | bfd_vma nval)); |
| 331 | /* A function which is called when a common symbol is defined |
| 332 | multiple times. NAME is the symbol appearing multiple times. |
| 333 | OBFD is the BFD of the existing symbol; it may be NULL if this is |
| 334 | not known. OTYPE is the type of the existing symbol, which may |
| 335 | be bfd_link_hash_defined, bfd_link_hash_defweak, |
| 336 | bfd_link_hash_common, or bfd_link_hash_indirect. If OTYPE is |
| 337 | bfd_link_hash_common, OSIZE is the size of the existing symbol. |
| 338 | NBFD is the BFD of the new symbol. NTYPE is the type of the new |
| 339 | symbol, one of bfd_link_hash_defined, bfd_link_hash_common, or |
| 340 | bfd_link_hash_indirect. If NTYPE is bfd_link_hash_common, NSIZE |
| 341 | is the size of the new symbol. */ |
| 342 | boolean (*multiple_common) PARAMS ((struct bfd_link_info *, |
| 343 | const char *name, |
| 344 | bfd *obfd, |
| 345 | enum bfd_link_hash_type otype, |
| 346 | bfd_vma osize, |
| 347 | bfd *nbfd, |
| 348 | enum bfd_link_hash_type ntype, |
| 349 | bfd_vma nsize)); |
| 350 | /* A function which is called to add a symbol to a set. ENTRY is |
| 351 | the link hash table entry for the set itself (e.g., |
| 352 | __CTOR_LIST__). RELOC is the relocation to use for an entry in |
| 353 | the set when generating a relocateable file, and is also used to |
| 354 | get the size of the entry when generating an executable file. |
| 355 | ABFD, SEC and VALUE identify the value to add to the set. */ |
| 356 | boolean (*add_to_set) PARAMS ((struct bfd_link_info *, |
| 357 | struct bfd_link_hash_entry *entry, |
| 358 | bfd_reloc_code_real_type reloc, |
| 359 | bfd *abfd, asection *sec, bfd_vma value)); |
| 360 | /* A function which is called when the name of a g++ constructor or |
| 361 | destructor is found. This is only called by some object file |
| 362 | formats. CONSTRUCTOR is true for a constructor, false for a |
| 363 | destructor. This will use BFD_RELOC_CTOR when generating a |
| 364 | relocateable file. NAME is the name of the symbol found. ABFD, |
| 365 | SECTION and VALUE are the value of the symbol. */ |
| 366 | boolean (*constructor) PARAMS ((struct bfd_link_info *, |
| 367 | boolean constructor, |
| 368 | const char *name, bfd *abfd, asection *sec, |
| 369 | bfd_vma value)); |
| 370 | /* A function which is called to issue a linker warning. For |
| 371 | example, this is called when there is a reference to a warning |
| 372 | symbol. WARNING is the warning to be issued. SYMBOL is the name |
| 373 | of the symbol which triggered the warning; it may be NULL if |
| 374 | there is none. ABFD, SECTION and ADDRESS identify the location |
| 375 | which trigerred the warning; either ABFD or SECTION or both may |
| 376 | be NULL if the location is not known. */ |
| 377 | boolean (*warning) PARAMS ((struct bfd_link_info *, |
| 378 | const char *warning, const char *symbol, |
| 379 | bfd *abfd, asection *section, |
| 380 | bfd_vma address)); |
| 381 | /* A function which is called when a relocation is attempted against |
| 382 | an undefined symbol. NAME is the symbol which is undefined. |
| 383 | ABFD, SECTION and ADDRESS identify the location from which the |
| 384 | reference is made. FATAL indicates whether an undefined symbol is |
| 385 | a fatal error or not. In some cases SECTION may be NULL. */ |
| 386 | boolean (*undefined_symbol) PARAMS ((struct bfd_link_info *, |
| 387 | const char *name, bfd *abfd, |
| 388 | asection *section, |
| 389 | bfd_vma address, |
| 390 | boolean fatal)); |
| 391 | /* A function which is called when a reloc overflow occurs. NAME is |
| 392 | the name of the symbol or section the reloc is against, |
| 393 | RELOC_NAME is the name of the relocation, and ADDEND is any |
| 394 | addend that is used. ABFD, SECTION and ADDRESS identify the |
| 395 | location at which the overflow occurs; if this is the result of a |
| 396 | bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then |
| 397 | ABFD will be NULL. */ |
| 398 | boolean (*reloc_overflow) PARAMS ((struct bfd_link_info *, |
| 399 | const char *name, |
| 400 | const char *reloc_name, bfd_vma addend, |
| 401 | bfd *abfd, asection *section, |
| 402 | bfd_vma address)); |
| 403 | /* A function which is called when a dangerous reloc is performed. |
| 404 | The canonical example is an a29k IHCONST reloc which does not |
| 405 | follow an IHIHALF reloc. MESSAGE is an appropriate message. |
| 406 | ABFD, SECTION and ADDRESS identify the location at which the |
| 407 | problem occurred; if this is the result of a |
| 408 | bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then |
| 409 | ABFD will be NULL. */ |
| 410 | boolean (*reloc_dangerous) PARAMS ((struct bfd_link_info *, |
| 411 | const char *message, |
| 412 | bfd *abfd, asection *section, |
| 413 | bfd_vma address)); |
| 414 | /* A function which is called when a reloc is found to be attached |
| 415 | to a symbol which is not being written out. NAME is the name of |
| 416 | the symbol. ABFD, SECTION and ADDRESS identify the location of |
| 417 | the reloc; if this is the result of a |
| 418 | bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then |
| 419 | ABFD will be NULL. */ |
| 420 | boolean (*unattached_reloc) PARAMS ((struct bfd_link_info *, |
| 421 | const char *name, |
| 422 | bfd *abfd, asection *section, |
| 423 | bfd_vma address)); |
| 424 | /* A function which is called when a symbol in notice_hash is |
| 425 | defined or referenced. NAME is the symbol. ABFD, SECTION and |
| 426 | ADDRESS are the value of the symbol. If SECTION is |
| 427 | bfd_und_section, this is a reference. */ |
| 428 | boolean (*notice) PARAMS ((struct bfd_link_info *, const char *name, |
| 429 | bfd *abfd, asection *section, bfd_vma address)); |
| 430 | }; |
| 431 | \f |
| 432 | /* The linker builds link_order structures which tell the code how to |
| 433 | include input data in the output file. */ |
| 434 | |
| 435 | /* These are the types of link_order structures. */ |
| 436 | |
| 437 | enum bfd_link_order_type |
| 438 | { |
| 439 | bfd_undefined_link_order, /* Undefined. */ |
| 440 | bfd_indirect_link_order, /* Built from a section. */ |
| 441 | bfd_fill_link_order, /* Fill with a 16 bit constant. */ |
| 442 | bfd_data_link_order, /* Set to explicit data. */ |
| 443 | bfd_section_reloc_link_order, /* Relocate against a section. */ |
| 444 | bfd_symbol_reloc_link_order /* Relocate against a symbol. */ |
| 445 | }; |
| 446 | |
| 447 | /* This is the link_order structure itself. These form a chain |
| 448 | attached to the section whose contents they are describing. */ |
| 449 | |
| 450 | struct bfd_link_order |
| 451 | { |
| 452 | /* Next link_order in chain. */ |
| 453 | struct bfd_link_order *next; |
| 454 | /* Type of link_order. */ |
| 455 | enum bfd_link_order_type type; |
| 456 | /* Offset within output section. */ |
| 457 | bfd_vma offset; |
| 458 | /* Size within output section. */ |
| 459 | bfd_size_type size; |
| 460 | /* Type specific information. */ |
| 461 | union |
| 462 | { |
| 463 | struct |
| 464 | { |
| 465 | /* Section to include. If this is used, then |
| 466 | section->output_section must be the section the |
| 467 | link_order is attached to, section->output_offset must |
| 468 | equal the link_order offset field, and section->_raw_size |
| 469 | must equal the link_order size field. Maybe these |
| 470 | restrictions should be relaxed someday. */ |
| 471 | asection *section; |
| 472 | } indirect; |
| 473 | struct |
| 474 | { |
| 475 | /* Value to fill with. */ |
| 476 | unsigned int value; |
| 477 | } fill; |
| 478 | struct |
| 479 | { |
| 480 | /* Data to put into file. The size field gives the number |
| 481 | of bytes which this field points to. */ |
| 482 | bfd_byte *contents; |
| 483 | } data; |
| 484 | struct |
| 485 | { |
| 486 | /* Description of reloc to generate. Used for |
| 487 | bfd_section_reloc_link_order and |
| 488 | bfd_symbol_reloc_link_order. */ |
| 489 | struct bfd_link_order_reloc *p; |
| 490 | } reloc; |
| 491 | } u; |
| 492 | }; |
| 493 | |
| 494 | /* A linker order of type bfd_section_reloc_link_order or |
| 495 | bfd_symbol_reloc_link_order means to create a reloc against a |
| 496 | section or symbol, respectively. This is used to implement -Ur to |
| 497 | generate relocs for the constructor tables. The |
| 498 | bfd_link_order_reloc structure describes the reloc that BFD should |
| 499 | create. It is similar to a arelent, but I didn't use arelent |
| 500 | because the linker does not know anything about most symbols, and |
| 501 | any asymbol structure it creates will be partially meaningless. |
| 502 | This information could logically be in the bfd_link_order struct, |
| 503 | but I didn't want to waste the space since these types of relocs |
| 504 | are relatively rare. */ |
| 505 | |
| 506 | struct bfd_link_order_reloc |
| 507 | { |
| 508 | /* Reloc type. */ |
| 509 | bfd_reloc_code_real_type reloc; |
| 510 | |
| 511 | union |
| 512 | { |
| 513 | /* For type bfd_section_reloc_link_order, this is the section |
| 514 | the reloc should be against. This must be a section in the |
| 515 | output BFD, not any of the input BFDs. */ |
| 516 | asection *section; |
| 517 | /* For type bfd_symbol_reloc_link_order, this is the name of the |
| 518 | symbol the reloc should be against. */ |
| 519 | const char *name; |
| 520 | } u; |
| 521 | |
| 522 | /* Addend to use. The object file should contain zero. The BFD |
| 523 | backend is responsible for filling in the contents of the object |
| 524 | file correctly. For some object file formats (e.g., COFF) the |
| 525 | addend must be stored into in the object file, and for some |
| 526 | (e.g., SPARC a.out) it is kept in the reloc. */ |
| 527 | bfd_vma addend; |
| 528 | }; |
| 529 | |
| 530 | /* Allocate a new link_order for a section. */ |
| 531 | extern struct bfd_link_order *bfd_new_link_order PARAMS ((bfd *, asection *)); |
| 532 | |
| 533 | /* These structures are used to describe version information for the |
| 534 | ELF linker. These structures could be manipulated entirely inside |
| 535 | BFD, but it would be a pain. Instead, the regular linker sets up |
| 536 | these structures, and then passes them into BFD. */ |
| 537 | |
| 538 | /* Regular expressions for a version. */ |
| 539 | |
| 540 | struct bfd_elf_version_expr |
| 541 | { |
| 542 | /* Next regular expression for this version. */ |
| 543 | struct bfd_elf_version_expr *next; |
| 544 | /* Regular expression. */ |
| 545 | const char *pattern; |
| 546 | /* Matching function. */ |
| 547 | int (*match) PARAMS((struct bfd_elf_version_expr *, const char *)); |
| 548 | }; |
| 549 | |
| 550 | /* Version dependencies. */ |
| 551 | |
| 552 | struct bfd_elf_version_deps |
| 553 | { |
| 554 | /* Next dependency for this version. */ |
| 555 | struct bfd_elf_version_deps *next; |
| 556 | /* The version which this version depends upon. */ |
| 557 | struct bfd_elf_version_tree *version_needed; |
| 558 | }; |
| 559 | |
| 560 | /* A node in the version tree. */ |
| 561 | |
| 562 | struct bfd_elf_version_tree |
| 563 | { |
| 564 | /* Next version. */ |
| 565 | struct bfd_elf_version_tree *next; |
| 566 | /* Name of this version. */ |
| 567 | const char *name; |
| 568 | /* Version number. */ |
| 569 | unsigned int vernum; |
| 570 | /* Regular expressions for global symbols in this version. */ |
| 571 | struct bfd_elf_version_expr *globals; |
| 572 | /* Regular expressions for local symbols in this version. */ |
| 573 | struct bfd_elf_version_expr *locals; |
| 574 | /* List of versions which this version depends upon. */ |
| 575 | struct bfd_elf_version_deps *deps; |
| 576 | /* Index of the version name. This is used within BFD. */ |
| 577 | unsigned int name_indx; |
| 578 | /* Whether this version tree was used. This is used within BFD. */ |
| 579 | int used; |
| 580 | }; |
| 581 | |
| 582 | #endif |