1 /* BFD ECOFF object file private structure. 2 Copyright 1993, 1994, 1995, 1996, 1999, 2001, 2002, 2003, 2004, 3 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. 4 Written by 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 3 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., 51 Franklin Street - Fifth Floor, Boston, 21 MA 02110-1301, USA. */ 22 23 #include "bfdlink.h" 24 25 #ifndef ECOFF_H 26 #include "coff/ecoff.h" 27 #endif 28 29 /* This is the backend information kept for ECOFF files. This 30 structure is constant for a particular backend. The first element 31 is the COFF backend data structure, so that ECOFF targets can use 32 the generic COFF code. */ 33 34 #define ecoff_backend(abfd) \ 35 ((struct ecoff_backend_data *) (abfd)->xvec->backend_data) 36 37 struct ecoff_backend_data 38 { 39 /* COFF backend information. This must be the first field. */ 40 bfd_coff_backend_data coff; 41 /* Supported architecture. */ 42 enum bfd_architecture arch; 43 /* Initial portion of armap string. */ 44 const char *armap_start; 45 /* The page boundary used to align sections in a demand-paged 46 executable file. E.g., 0x1000. */ 47 bfd_vma round; 48 /* TRUE if the .rdata section is part of the text segment, as on the 49 Alpha. FALSE if .rdata is part of the data segment, as on the 50 MIPS. */ 51 bfd_boolean rdata_in_text; 52 /* Bitsize of constructor entries. */ 53 unsigned int constructor_bitsize; 54 /* Reloc to use for constructor entries. */ 55 reloc_howto_type *constructor_reloc; 56 /* How to swap debugging information. */ 57 struct ecoff_debug_swap debug_swap; 58 /* External reloc size. */ 59 bfd_size_type external_reloc_size; 60 /* Reloc swapping functions. */ 61 void (*swap_reloc_in) (bfd *, void *, struct internal_reloc *); 62 void (*swap_reloc_out) (bfd *, const struct internal_reloc *, void *); 63 /* Backend reloc tweaking. */ 64 void (*adjust_reloc_in) 65 (bfd *, const struct internal_reloc *, arelent *); 66 void (*adjust_reloc_out) 67 (bfd *, const arelent *, struct internal_reloc *); 68 /* Relocate section contents while linking. */ 69 bfd_boolean (*relocate_section) 70 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, void *); 71 /* Do final adjustments to filehdr and aouthdr. */ 72 bfd_boolean (*adjust_headers) 73 (bfd *, struct internal_filehdr *, struct internal_aouthdr *); 74 /* Read an element from an archive at a given file position. This 75 is needed because OSF/1 3.2 uses a weird archive format. */ 76 bfd *(*get_elt_at_filepos) (bfd *, file_ptr); 77 }; 78 79 /* ECOFF targets don't support COFF long section names, so this 80 macro is provided to use as an initialiser for the related 81 members of the embedded bfd_coff_backend_data struct. */ 82 #define ECOFF_NO_LONG_SECTION_NAMES (FALSE), _bfd_ecoff_no_long_sections 83 84 /* This is the target specific information kept for ECOFF files. */ 85 86 #define ecoff_data(abfd) ((abfd)->tdata.ecoff_obj_data) 87 88 typedef struct ecoff_tdata 89 { 90 /* The reloc file position, set by 91 ecoff_compute_section_file_positions. */ 92 file_ptr reloc_filepos; 93 94 /* The symbol table file position, set by _bfd_ecoff_mkobject_hook. */ 95 file_ptr sym_filepos; 96 97 /* The start and end of the text segment. Only valid for an 98 existing file, not for one we are creating. */ 99 unsigned long text_start; 100 unsigned long text_end; 101 102 /* The cached gp value. This is used when relocating. */ 103 bfd_vma gp; 104 105 /* The maximum size of objects to optimize using gp. This is 106 typically set by the -G option to the compiler, assembler or 107 linker. */ 108 unsigned int gp_size; 109 110 /* The register masks. When linking, all the masks found in the 111 input files are combined into the masks of the output file. 112 These are not all used for all targets, but that's OK, because 113 the relevant ones are the only ones swapped in and out. */ 114 unsigned long gprmask; 115 unsigned long fprmask; 116 unsigned long cprmask[4]; 117 118 /* The ECOFF symbolic debugging information. */ 119 struct ecoff_debug_info debug_info; 120 121 /* The unswapped ECOFF symbolic information. */ 122 void * raw_syments; 123 124 /* The canonical BFD symbols. */ 125 struct ecoff_symbol_struct *canonical_symbols; 126 127 /* A mapping from external symbol numbers to entries in the linker 128 hash table, used when linking. */ 129 struct ecoff_link_hash_entry **sym_hashes; 130 131 /* A mapping from reloc symbol indices to sections, used when 132 linking. */ 133 asection **symndx_to_section; 134 135 /* TRUE if this BFD was written by the backend linker. */ 136 bfd_boolean linker; 137 138 /* TRUE if a warning that multiple global pointer values are 139 needed in the output binary was issued already. */ 140 bfd_boolean issued_multiple_gp_warning; 141 142 /* Used by find_nearest_line entry point. The structure could be 143 included directly in this one, but there's no point to wasting 144 the memory just for the infrequently called find_nearest_line. */ 145 struct ecoff_find_line *find_line_info; 146 147 /* Whether the .rdata section is in the text segment for this 148 particular ECOFF file. This is not valid until 149 ecoff_compute_section_file_positions is called. */ 150 bfd_boolean rdata_in_text; 151 152 } ecoff_data_type; 153 154 /* Each canonical asymbol really looks like this. */ 155 156 typedef struct ecoff_symbol_struct 157 { 158 /* The actual symbol which the rest of BFD works with */ 159 asymbol symbol; 160 161 /* The fdr for this symbol. */ 162 FDR *fdr; 163 164 /* TRUE if this is a local symbol rather than an external one. */ 165 bfd_boolean local; 166 167 /* A pointer to the unswapped hidden information for this symbol. 168 This is either a struct sym_ext or a struct ext_ext, depending on 169 the value of the local field above. */ 170 void * native; 171 } ecoff_symbol_type; 172 173 /* We take the address of the first element of an asymbol to ensure that the 174 macro is only ever applied to an asymbol. */ 175 #define ecoffsymbol(asymbol) ((ecoff_symbol_type *) (&((asymbol)->the_bfd))) 176 177 /* We need to save the index of an external symbol when we write it 178 out so that can set the symbol index correctly when we write out 179 the relocs. */ 180 #define ecoff_get_sym_index(symbol) ((symbol)->udata.i) 181 #define ecoff_set_sym_index(symbol, idx) ((symbol)->udata.i = (idx)) 182 183 /* A pointer to this structure is put in the used_by_bfd pointer of 184 a section to keep track of any per-section data. 185 The user_by_bfd pointer will be NULL if the information was not 186 needed. */ 187 188 struct ecoff_section_tdata 189 { 190 /* When producing an executable (i.e., final, non-relocatable link) 191 on the Alpha, we may need to use multiple global pointer values 192 to span the entire .lita section. In essence, we allow each 193 input .lita section to have its own gp value. To support this, 194 we need to keep track of the gp values that we picked for each 195 input .lita section . */ 196 bfd_vma gp; 197 }; 198 199 /* An accessor macro for the ecoff_section_tdata structure. */ 200 #define ecoff_section_data(abfd, sec) \ 201 ((struct ecoff_section_tdata *) (sec)->used_by_bfd) 202 203 /* ECOFF linker hash table entries. */ 204 205 struct ecoff_link_hash_entry 206 { 207 struct bfd_link_hash_entry root; 208 /* Symbol index in output file. */ 209 long indx; 210 /* BFD that ext field value came from. */ 211 bfd *abfd; 212 /* ECOFF external symbol information. */ 213 EXTR esym; 214 /* Nonzero if this symbol has been written out. */ 215 char written; 216 /* Nonzero if this symbol was referred to as small undefined. */ 217 char small; 218 }; 219 220 /* ECOFF linker hash table. */ 221 222 struct ecoff_link_hash_table 223 { 224 struct bfd_link_hash_table root; 225 }; 226 227 /* Make an ECOFF object. */ 228 extern bfd_boolean _bfd_ecoff_mkobject (bfd *); 229 230 /* Read in the ECOFF symbolic debugging information. */ 231 extern bfd_boolean _bfd_ecoff_slurp_symbolic_info 232 (bfd *, asection *, struct ecoff_debug_info *); 233 234 /* Generic ECOFF BFD backend vectors. */ 235 236 extern bfd_boolean _bfd_ecoff_write_object_contents (bfd *); 237 238 #define _bfd_ecoff_close_and_cleanup _bfd_generic_close_and_cleanup 239 #define _bfd_ecoff_bfd_free_cached_info _bfd_generic_bfd_free_cached_info 240 extern bfd_boolean _bfd_ecoff_new_section_hook 241 (bfd *, asection *); 242 extern bfd_boolean _bfd_ecoff_get_section_contents 243 (bfd *, asection *, void * location, file_ptr, bfd_size_type); 244 245 #define _bfd_ecoff_bfd_link_split_section _bfd_generic_link_split_section 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_openr_next_archived_file \ 274 bfd_generic_openr_next_archived_file 275 #define _bfd_ecoff_get_elt_at_index _bfd_generic_get_elt_at_index 276 #define _bfd_ecoff_generic_stat_arch_elt bfd_generic_stat_arch_elt 277 #define _bfd_ecoff_update_armap_timestamp bfd_true 278 #define _bfd_ecoff_bfd_is_target_special_symbol \ 279 ((bfd_boolean (*) (bfd *, asymbol *)) bfd_false) 280 281 extern long _bfd_ecoff_get_symtab_upper_bound (bfd *); 282 extern long _bfd_ecoff_canonicalize_symtab (bfd *, asymbol **); 283 extern asymbol *_bfd_ecoff_make_empty_symbol (bfd *); 284 extern void _bfd_ecoff_print_symbol 285 (bfd *, void *, asymbol *, bfd_print_symbol_type); 286 extern void _bfd_ecoff_get_symbol_info 287 (bfd *, asymbol *, symbol_info *); 288 extern bfd_boolean _bfd_ecoff_bfd_is_local_label_name 289 (bfd *, const char *); 290 #define _bfd_ecoff_get_lineno _bfd_nosymbols_get_lineno 291 extern bfd_boolean _bfd_ecoff_find_nearest_line 292 (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **, 293 unsigned int *); 294 #define _bfd_ecoff_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol 295 #define _bfd_ecoff_read_minisymbols _bfd_generic_read_minisymbols 296 #define _bfd_ecoff_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol 297 #define _bfd_ecoff_find_inliner_info _bfd_nosymbols_find_inliner_info 298 299 #define _bfd_ecoff_get_reloc_upper_bound coff_get_reloc_upper_bound 300 extern long _bfd_ecoff_canonicalize_reloc 301 (bfd *, asection *, arelent **, asymbol **symbols); 302 /* ecoff_bfd_reloc_type_lookup defined by backend. */ 303 304 extern bfd_boolean _bfd_ecoff_set_arch_mach 305 (bfd *, enum bfd_architecture, unsigned long); 306 extern bfd_boolean _bfd_ecoff_set_section_contents 307 (bfd *, asection *, const void * location, file_ptr, bfd_size_type); 308 309 extern int _bfd_ecoff_sizeof_headers (bfd *, struct bfd_link_info *); 310 /* ecoff_bfd_get_relocated_section_contents defined by backend. */ 311 /* ecoff_bfd_relax_section defined by backend. */ 312 extern struct bfd_link_hash_table *_bfd_ecoff_bfd_link_hash_table_create 313 (bfd *); 314 #define _bfd_ecoff_bfd_link_hash_table_free _bfd_generic_link_hash_table_free 315 extern bfd_boolean _bfd_ecoff_bfd_link_add_symbols 316 (bfd *, struct bfd_link_info *); 317 #define _bfd_ecoff_bfd_link_just_syms _bfd_generic_link_just_syms 318 extern bfd_boolean _bfd_ecoff_bfd_final_link 319 (bfd *, struct bfd_link_info *); 320 321 /* Hook functions for the generic COFF section reading code. */ 322 323 extern void * _bfd_ecoff_mkobject_hook (bfd *, void *, void *); 324 #define _bfd_ecoff_set_alignment_hook \ 325 ((void (*) (bfd *, asection *, void *)) bfd_void) 326 extern bfd_boolean _bfd_ecoff_set_arch_mach_hook 327 (bfd *, void *); 328 extern bfd_boolean _bfd_ecoff_no_long_sections 329 (bfd *abfd, int enable); 330 extern bfd_boolean _bfd_ecoff_styp_to_sec_flags 331 (bfd *, void *, const char *, asection *, flagword *); 332 extern bfd_boolean _bfd_ecoff_slurp_symbol_table (bfd *); 333 334 /* ECOFF auxiliary information swapping routines. These are the same 335 for all ECOFF targets, so they are defined in ecofflink.c. */ 336 337 extern void _bfd_ecoff_swap_tir_in 338 (int, const struct tir_ext *, TIR *); 339 extern void _bfd_ecoff_swap_tir_out 340 (int, const TIR *, struct tir_ext *); 341 extern void _bfd_ecoff_swap_rndx_in 342 (int, const struct rndx_ext *, RNDXR *); 343 extern void _bfd_ecoff_swap_rndx_out 344 (int, const RNDXR *, struct rndx_ext *); 345