1 /* BFD ECOFF object file private structure. 2 Copyright (C) 1993-2016 Free Software Foundation, Inc. 3 Written by Ian Lance Taylor, 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 #include "bfdlink.h" 23 24 #ifndef ECOFF_H 25 #include "coff/ecoff.h" 26 #endif 27 28 /* This is the backend information kept for ECOFF files. This 29 structure is constant for a particular backend. The first element 30 is the COFF backend data structure, so that ECOFF targets can use 31 the generic COFF code. */ 32 33 #define ecoff_backend(abfd) \ 34 ((struct ecoff_backend_data *) (abfd)->xvec->backend_data) 35 36 struct ecoff_backend_data 37 { 38 /* COFF backend information. This must be the first field. */ 39 bfd_coff_backend_data coff; 40 /* Supported architecture. */ 41 enum bfd_architecture arch; 42 /* Initial portion of armap string. */ 43 const char *armap_start; 44 /* The page boundary used to align sections in a demand-paged 45 executable file. E.g., 0x1000. */ 46 bfd_vma round; 47 /* TRUE if the .rdata section is part of the text segment, as on the 48 Alpha. FALSE if .rdata is part of the data segment, as on the 49 MIPS. */ 50 bfd_boolean rdata_in_text; 51 /* Bitsize of constructor entries. */ 52 unsigned int constructor_bitsize; 53 /* Reloc to use for constructor entries. */ 54 reloc_howto_type *constructor_reloc; 55 /* How to swap debugging information. */ 56 struct ecoff_debug_swap debug_swap; 57 /* External reloc size. */ 58 bfd_size_type external_reloc_size; 59 /* Reloc swapping functions. */ 60 void (*swap_reloc_in) (bfd *, void *, struct internal_reloc *); 61 void (*swap_reloc_out) (bfd *, const struct internal_reloc *, void *); 62 /* Backend reloc tweaking. */ 63 void (*adjust_reloc_in) 64 (bfd *, const struct internal_reloc *, arelent *); 65 void (*adjust_reloc_out) 66 (bfd *, const arelent *, struct internal_reloc *); 67 /* Relocate section contents while linking. */ 68 bfd_boolean (*relocate_section) 69 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, void *); 70 /* Do final adjustments to filehdr and aouthdr. */ 71 bfd_boolean (*adjust_headers) 72 (bfd *, struct internal_filehdr *, struct internal_aouthdr *); 73 /* Read an element from an archive at a given file position. This 74 is needed because OSF/1 3.2 uses a weird archive format. */ 75 bfd *(*get_elt_at_filepos) (bfd *, file_ptr); 76 }; 77 78 /* ECOFF targets don't support COFF long section names, so this 79 macro is provided to use as an initialiser for the related 80 members of the embedded bfd_coff_backend_data struct. */ 81 #define ECOFF_NO_LONG_SECTION_NAMES (FALSE), _bfd_ecoff_no_long_sections 82 83 /* This is the target specific information kept for ECOFF files. */ 84 85 #define ecoff_data(abfd) ((abfd)->tdata.ecoff_obj_data) 86 87 typedef struct ecoff_tdata 88 { 89 /* The reloc file position, set by 90 ecoff_compute_section_file_positions. */ 91 file_ptr reloc_filepos; 92 93 /* The symbol table file position, set by _bfd_ecoff_mkobject_hook. */ 94 file_ptr sym_filepos; 95 96 /* The start and end of the text segment. Only valid for an 97 existing file, not for one we are creating. */ 98 unsigned long text_start; 99 unsigned long text_end; 100 101 /* The cached gp value. This is used when relocating. */ 102 bfd_vma gp; 103 104 /* The maximum size of objects to optimize using gp. This is 105 typically set by the -G option to the compiler, assembler or 106 linker. */ 107 unsigned int gp_size; 108 109 /* The register masks. When linking, all the masks found in the 110 input files are combined into the masks of the output file. 111 These are not all used for all targets, but that's OK, because 112 the relevant ones are the only ones swapped in and out. */ 113 unsigned long gprmask; 114 unsigned long fprmask; 115 unsigned long cprmask[4]; 116 117 /* The ECOFF symbolic debugging information. */ 118 struct ecoff_debug_info debug_info; 119 120 /* The unswapped ECOFF symbolic information. */ 121 void * raw_syments; 122 123 /* The canonical BFD symbols. */ 124 struct ecoff_symbol_struct *canonical_symbols; 125 126 /* A mapping from external symbol numbers to entries in the linker 127 hash table, used when linking. */ 128 struct ecoff_link_hash_entry **sym_hashes; 129 130 /* A mapping from reloc symbol indices to sections, used when 131 linking. */ 132 asection **symndx_to_section; 133 134 /* TRUE if this BFD was written by the backend linker. */ 135 bfd_boolean linker; 136 137 /* TRUE if a warning that multiple global pointer values are 138 needed in the output binary was issued already. */ 139 bfd_boolean issued_multiple_gp_warning; 140 141 /* Used by find_nearest_line entry point. The structure could be 142 included directly in this one, but there's no point to wasting 143 the memory just for the infrequently called find_nearest_line. */ 144 struct ecoff_find_line *find_line_info; 145 146 /* Whether the .rdata section is in the text segment for this 147 particular ECOFF file. This is not valid until 148 ecoff_compute_section_file_positions is called. */ 149 bfd_boolean rdata_in_text; 150 151 } ecoff_data_type; 152 153 /* Each canonical asymbol really looks like this. */ 154 155 typedef struct ecoff_symbol_struct 156 { 157 /* The actual symbol which the rest of BFD works with */ 158 asymbol symbol; 159 160 /* The fdr for this symbol. */ 161 FDR *fdr; 162 163 /* TRUE if this is a local symbol rather than an external one. */ 164 bfd_boolean local; 165 166 /* A pointer to the unswapped hidden information for this symbol. 167 This is either a struct sym_ext or a struct ext_ext, depending on 168 the value of the local field above. */ 169 void * native; 170 } ecoff_symbol_type; 171 172 /* We take the address of the first element of an asymbol to ensure that the 173 macro is only ever applied to an asymbol. */ 174 #define ecoffsymbol(asymbol) ((ecoff_symbol_type *) (&((asymbol)->the_bfd))) 175 176 /* We need to save the index of an external symbol when we write it 177 out so that can set the symbol index correctly when we write out 178 the relocs. */ 179 #define ecoff_get_sym_index(symbol) ((symbol)->udata.i) 180 #define ecoff_set_sym_index(symbol, idx) ((symbol)->udata.i = (idx)) 181 182 /* A pointer to this structure is put in the used_by_bfd pointer of 183 a section to keep track of any per-section data. 184 The user_by_bfd pointer will be NULL if the information was not 185 needed. */ 186 187 struct ecoff_section_tdata 188 { 189 /* When producing an executable (i.e., final, non-relocatable link) 190 on the Alpha, we may need to use multiple global pointer values 191 to span the entire .lita section. In essence, we allow each 192 input .lita section to have its own gp value. To support this, 193 we need to keep track of the gp values that we picked for each 194 input .lita section . */ 195 bfd_vma gp; 196 }; 197 198 /* An accessor macro for the ecoff_section_tdata structure. */ 199 #define ecoff_section_data(abfd, sec) \ 200 ((struct ecoff_section_tdata *) (sec)->used_by_bfd) 201 202 /* ECOFF linker hash table entries. */ 203 204 struct ecoff_link_hash_entry 205 { 206 struct bfd_link_hash_entry root; 207 /* Symbol index in output file. */ 208 long indx; 209 /* BFD that ext field value came from. */ 210 bfd *abfd; 211 /* ECOFF external symbol information. */ 212 EXTR esym; 213 /* Nonzero if this symbol has been written out. */ 214 char written; 215 /* Nonzero if this symbol was referred to as small undefined. */ 216 char small; 217 }; 218 219 /* ECOFF linker hash table. */ 220 221 struct ecoff_link_hash_table 222 { 223 struct bfd_link_hash_table root; 224 }; 225 226 /* Make an ECOFF object. */ 227 extern bfd_boolean _bfd_ecoff_mkobject (bfd *); 228 229 /* Read in the ECOFF symbolic debugging information. */ 230 extern bfd_boolean _bfd_ecoff_slurp_symbolic_info 231 (bfd *, asection *, struct ecoff_debug_info *); 232 233 /* Generic ECOFF BFD backend vectors. */ 234 235 extern bfd_boolean _bfd_ecoff_write_object_contents (bfd *); 236 237 #define _bfd_ecoff_close_and_cleanup _bfd_generic_close_and_cleanup 238 #define _bfd_ecoff_bfd_free_cached_info _bfd_generic_bfd_free_cached_info 239 extern bfd_boolean _bfd_ecoff_new_section_hook 240 (bfd *, asection *); 241 extern bfd_boolean _bfd_ecoff_get_section_contents 242 (bfd *, asection *, void * location, file_ptr, bfd_size_type); 243 244 #define _bfd_ecoff_bfd_link_split_section _bfd_generic_link_split_section 245 #define _bfd_ecoff_bfd_link_check_relocs _bfd_generic_link_check_relocs 246 247 extern bfd_boolean _bfd_ecoff_bfd_copy_private_bfd_data 248 (bfd *, bfd *); 249 #define _bfd_ecoff_bfd_copy_private_section_data \ 250 _bfd_generic_bfd_copy_private_section_data 251 252 #define _bfd_ecoff_bfd_copy_private_symbol_data \ 253 _bfd_generic_bfd_copy_private_symbol_data 254 255 #define _bfd_ecoff_bfd_copy_private_header_data \ 256 _bfd_generic_bfd_copy_private_header_data 257 258 #define _bfd_ecoff_bfd_print_private_bfd_data \ 259 _bfd_generic_bfd_print_private_bfd_data 260 261 #define _bfd_ecoff_bfd_merge_private_bfd_data \ 262 _bfd_generic_bfd_merge_private_bfd_data 263 264 #define _bfd_ecoff_bfd_set_private_flags _bfd_generic_bfd_set_private_flags 265 extern bfd_boolean _bfd_ecoff_slurp_armap (bfd *); 266 #define _bfd_ecoff_slurp_extended_name_table _bfd_slurp_extended_name_table 267 #define _bfd_ecoff_construct_extended_name_table \ 268 _bfd_archive_bsd_construct_extended_name_table 269 #define _bfd_ecoff_truncate_arname bfd_dont_truncate_arname 270 extern bfd_boolean _bfd_ecoff_write_armap 271 (bfd *, unsigned int, struct orl *, unsigned int, int); 272 #define _bfd_ecoff_read_ar_hdr _bfd_generic_read_ar_hdr 273 #define _bfd_ecoff_write_ar_hdr _bfd_generic_write_ar_hdr 274 #define _bfd_ecoff_openr_next_archived_file \ 275 bfd_generic_openr_next_archived_file 276 #define _bfd_ecoff_get_elt_at_index _bfd_generic_get_elt_at_index 277 #define _bfd_ecoff_generic_stat_arch_elt bfd_generic_stat_arch_elt 278 #define _bfd_ecoff_update_armap_timestamp bfd_true 279 #define _bfd_ecoff_bfd_is_target_special_symbol \ 280 ((bfd_boolean (*) (bfd *, asymbol *)) bfd_false) 281 282 extern long _bfd_ecoff_get_symtab_upper_bound (bfd *); 283 extern long _bfd_ecoff_canonicalize_symtab (bfd *, asymbol **); 284 extern asymbol *_bfd_ecoff_make_empty_symbol (bfd *); 285 extern void _bfd_ecoff_print_symbol 286 (bfd *, void *, asymbol *, bfd_print_symbol_type); 287 extern void _bfd_ecoff_get_symbol_info 288 (bfd *, asymbol *, symbol_info *); 289 #define _bfd_ecoff_get_symbol_version_string \ 290 _bfd_nosymbols_get_symbol_version_string 291 extern bfd_boolean _bfd_ecoff_bfd_is_local_label_name 292 (bfd *, const char *); 293 #define _bfd_ecoff_get_lineno _bfd_nosymbols_get_lineno 294 extern bfd_boolean _bfd_ecoff_find_nearest_line 295 (bfd *, asymbol **, asection *, bfd_vma, 296 const char **, const char **, unsigned int *, unsigned int *); 297 #define _bfd_ecoff_find_line _bfd_nosymbols_find_line 298 #define _bfd_ecoff_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol 299 #define _bfd_ecoff_read_minisymbols _bfd_generic_read_minisymbols 300 #define _bfd_ecoff_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol 301 #define _bfd_ecoff_find_inliner_info _bfd_nosymbols_find_inliner_info 302 303 #define _bfd_ecoff_get_reloc_upper_bound coff_get_reloc_upper_bound 304 extern long _bfd_ecoff_canonicalize_reloc 305 (bfd *, asection *, arelent **, asymbol **symbols); 306 /* ecoff_bfd_reloc_type_lookup defined by backend. */ 307 308 extern bfd_boolean _bfd_ecoff_set_arch_mach 309 (bfd *, enum bfd_architecture, unsigned long); 310 extern bfd_boolean _bfd_ecoff_set_section_contents 311 (bfd *, asection *, const void * location, file_ptr, bfd_size_type); 312 313 extern int _bfd_ecoff_sizeof_headers (bfd *, struct bfd_link_info *); 314 /* ecoff_bfd_get_relocated_section_contents defined by backend. */ 315 /* ecoff_bfd_relax_section defined by backend. */ 316 extern struct bfd_link_hash_table *_bfd_ecoff_bfd_link_hash_table_create 317 (bfd *); 318 extern bfd_boolean _bfd_ecoff_bfd_link_add_symbols 319 (bfd *, struct bfd_link_info *); 320 #define _bfd_ecoff_bfd_link_just_syms _bfd_generic_link_just_syms 321 #define _bfd_ecoff_bfd_copy_link_hash_symbol_type \ 322 _bfd_generic_copy_link_hash_symbol_type 323 extern bfd_boolean _bfd_ecoff_bfd_final_link 324 (bfd *, struct bfd_link_info *); 325 326 /* Hook functions for the generic COFF section reading code. */ 327 328 extern void * _bfd_ecoff_mkobject_hook (bfd *, void *, void *); 329 #define _bfd_ecoff_set_alignment_hook \ 330 ((void (*) (bfd *, asection *, void *)) bfd_void) 331 extern bfd_boolean _bfd_ecoff_set_arch_mach_hook 332 (bfd *, void *); 333 extern bfd_boolean _bfd_ecoff_no_long_sections 334 (bfd *abfd, int enable); 335 extern bfd_boolean _bfd_ecoff_styp_to_sec_flags 336 (bfd *, void *, const char *, asection *, flagword *); 337 extern bfd_boolean _bfd_ecoff_slurp_symbol_table (bfd *); 338 339 /* ECOFF auxiliary information swapping routines. These are the same 340 for all ECOFF targets, so they are defined in ecofflink.c. */ 341 342 extern void _bfd_ecoff_swap_tir_in 343 (int, const struct tir_ext *, TIR *); 344 extern void _bfd_ecoff_swap_tir_out 345 (int, const TIR *, struct tir_ext *); 346 extern void _bfd_ecoff_swap_rndx_in 347 (int, const struct rndx_ext *, RNDXR *); 348 extern void _bfd_ecoff_swap_rndx_out 349 (int, const RNDXR *, struct rndx_ext *); 350
