1 /* BFD ECOFF object file private structure. 2 Copyright 1993, 1994, 1995, 1996, 1999, 2001, 2002, 2003, 2004, 3 2005 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 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., 51 Franklin Street - Fifth Floor, Boston, 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 /* This is the target specific information kept for ECOFF files. */ 79 80 #define ecoff_data(abfd) ((abfd)->tdata.ecoff_obj_data) 81 82 typedef struct ecoff_tdata 83 { 84 /* The reloc file position, set by 85 ecoff_compute_section_file_positions. */ 86 file_ptr reloc_filepos; 87 88 /* The symbol table file position, set by _bfd_ecoff_mkobject_hook. */ 89 file_ptr sym_filepos; 90 91 /* The start and end of the text segment. Only valid for an 92 existing file, not for one we are creating. */ 93 unsigned long text_start; 94 unsigned long text_end; 95 96 /* The cached gp value. This is used when relocating. */ 97 bfd_vma gp; 98 99 /* The maximum size of objects to optimize using gp. This is 100 typically set by the -G option to the compiler, assembler or 101 linker. */ 102 unsigned int gp_size; 103 104 /* The register masks. When linking, all the masks found in the 105 input files are combined into the masks of the output file. 106 These are not all used for all targets, but that's OK, because 107 the relevant ones are the only ones swapped in and out. */ 108 unsigned long gprmask; 109 unsigned long fprmask; 110 unsigned long cprmask[4]; 111 112 /* The ECOFF symbolic debugging information. */ 113 struct ecoff_debug_info debug_info; 114 115 /* The unswapped ECOFF symbolic information. */ 116 void * raw_syments; 117 118 /* The canonical BFD symbols. */ 119 struct ecoff_symbol_struct *canonical_symbols; 120 121 /* A mapping from external symbol numbers to entries in the linker 122 hash table, used when linking. */ 123 struct ecoff_link_hash_entry **sym_hashes; 124 125 /* A mapping from reloc symbol indices to sections, used when 126 linking. */ 127 asection **symndx_to_section; 128 129 /* TRUE if this BFD was written by the backend linker. */ 130 bfd_boolean linker; 131 132 /* TRUE if a warning that multiple global pointer values are 133 needed in the output binary was issued already. */ 134 bfd_boolean issued_multiple_gp_warning; 135 136 /* Used by find_nearest_line entry point. The structure could be 137 included directly in this one, but there's no point to wasting 138 the memory just for the infrequently called find_nearest_line. */ 139 struct ecoff_find_line *find_line_info; 140 141 /* Whether the .rdata section is in the text segment for this 142 particular ECOFF file. This is not valid until 143 ecoff_compute_section_file_positions is called. */ 144 bfd_boolean rdata_in_text; 145 146 } ecoff_data_type; 147 148 /* Each canonical asymbol really looks like this. */ 149 150 typedef struct ecoff_symbol_struct 151 { 152 /* The actual symbol which the rest of BFD works with */ 153 asymbol symbol; 154 155 /* The fdr for this symbol. */ 156 FDR *fdr; 157 158 /* TRUE if this is a local symbol rather than an external one. */ 159 bfd_boolean local; 160 161 /* A pointer to the unswapped hidden information for this symbol. 162 This is either a struct sym_ext or a struct ext_ext, depending on 163 the value of the local field above. */ 164 void * native; 165 } ecoff_symbol_type; 166 167 /* We take the address of the first element of an asymbol to ensure that the 168 macro is only ever applied to an asymbol. */ 169 #define ecoffsymbol(asymbol) ((ecoff_symbol_type *) (&((asymbol)->the_bfd))) 170 171 /* We need to save the index of an external symbol when we write it 172 out so that can set the symbol index correctly when we write out 173 the relocs. */ 174 #define ecoff_get_sym_index(symbol) ((symbol)->udata.i) 175 #define ecoff_set_sym_index(symbol, idx) ((symbol)->udata.i = (idx)) 176 177 /* A pointer to this structure is put in the used_by_bfd pointer of 178 a section to keep track of any per-section data. 179 The user_by_bfd pointer will be NULL if the information was not 180 needed. */ 181 182 struct ecoff_section_tdata 183 { 184 /* When producing an executable (i.e., final, non-relocatable link) 185 on the Alpha, we may need to use multiple global pointer values 186 to span the entire .lita section. In essence, we allow each 187 input .lita section to have its own gp value. To support this, 188 we need to keep track of the gp values that we picked for each 189 input .lita section . */ 190 bfd_vma gp; 191 }; 192 193 /* An accessor macro for the ecoff_section_tdata structure. */ 194 #define ecoff_section_data(abfd, sec) \ 195 ((struct ecoff_section_tdata *) (sec)->used_by_bfd) 196 197 /* ECOFF linker hash table entries. */ 198 199 struct ecoff_link_hash_entry 200 { 201 struct bfd_link_hash_entry root; 202 /* Symbol index in output file. */ 203 long indx; 204 /* BFD that ext field value came from. */ 205 bfd *abfd; 206 /* ECOFF external symbol information. */ 207 EXTR esym; 208 /* Nonzero if this symbol has been written out. */ 209 char written; 210 /* Nonzero if this symbol was referred to as small undefined. */ 211 char small; 212 }; 213 214 /* ECOFF linker hash table. */ 215 216 struct ecoff_link_hash_table 217 { 218 struct bfd_link_hash_table root; 219 }; 220 221 /* Make an ECOFF object. */ 222 extern bfd_boolean _bfd_ecoff_mkobject (bfd *); 223 224 /* Read in the ECOFF symbolic debugging information. */ 225 extern bfd_boolean _bfd_ecoff_slurp_symbolic_info 226 (bfd *, asection *, struct ecoff_debug_info *); 227 228 /* Generic ECOFF BFD backend vectors. */ 229 230 extern bfd_boolean _bfd_ecoff_write_object_contents (bfd *); 231 extern const bfd_target *_bfd_ecoff_archive_p (bfd *); 232 233 #define _bfd_ecoff_close_and_cleanup _bfd_generic_close_and_cleanup 234 #define _bfd_ecoff_bfd_free_cached_info _bfd_generic_bfd_free_cached_info 235 extern bfd_boolean _bfd_ecoff_new_section_hook 236 (bfd *, asection *); 237 extern bfd_boolean _bfd_ecoff_get_section_contents 238 (bfd *, asection *, void * location, file_ptr, bfd_size_type); 239 240 #define _bfd_ecoff_bfd_link_split_section _bfd_generic_link_split_section 241 242 extern bfd_boolean _bfd_ecoff_bfd_copy_private_bfd_data 243 (bfd *, bfd *); 244 #define _bfd_ecoff_bfd_copy_private_section_data \ 245 _bfd_generic_bfd_copy_private_section_data 246 247 #define _bfd_ecoff_bfd_copy_private_symbol_data \ 248 _bfd_generic_bfd_copy_private_symbol_data 249 250 #define _bfd_ecoff_bfd_copy_private_header_data \ 251 _bfd_generic_bfd_copy_private_header_data 252 253 #define _bfd_ecoff_bfd_print_private_bfd_data \ 254 _bfd_generic_bfd_print_private_bfd_data 255 256 #define _bfd_ecoff_bfd_merge_private_bfd_data \ 257 _bfd_generic_bfd_merge_private_bfd_data 258 259 #define _bfd_ecoff_bfd_set_private_flags _bfd_generic_bfd_set_private_flags 260 extern bfd_boolean _bfd_ecoff_slurp_armap (bfd *); 261 #define _bfd_ecoff_slurp_extended_name_table _bfd_slurp_extended_name_table 262 #define _bfd_ecoff_construct_extended_name_table \ 263 _bfd_archive_bsd_construct_extended_name_table 264 #define _bfd_ecoff_truncate_arname bfd_dont_truncate_arname 265 extern bfd_boolean _bfd_ecoff_write_armap 266 (bfd *, unsigned int, struct orl *, unsigned int, int); 267 #define _bfd_ecoff_read_ar_hdr _bfd_generic_read_ar_hdr 268 #define _bfd_ecoff_openr_next_archived_file \ 269 bfd_generic_openr_next_archived_file 270 #define _bfd_ecoff_get_elt_at_index _bfd_generic_get_elt_at_index 271 #define _bfd_ecoff_generic_stat_arch_elt bfd_generic_stat_arch_elt 272 #define _bfd_ecoff_update_armap_timestamp bfd_true 273 #define _bfd_ecoff_bfd_is_target_special_symbol \ 274 ((bfd_boolean (*) (bfd *, asymbol *)) bfd_false) 275 276 extern long _bfd_ecoff_get_symtab_upper_bound (bfd *); 277 extern long _bfd_ecoff_canonicalize_symtab (bfd *, asymbol **); 278 extern asymbol *_bfd_ecoff_make_empty_symbol (bfd *); 279 extern void _bfd_ecoff_print_symbol 280 (bfd *, void *, asymbol *, bfd_print_symbol_type); 281 extern void _bfd_ecoff_get_symbol_info 282 (bfd *, asymbol *, symbol_info *); 283 extern bfd_boolean _bfd_ecoff_bfd_is_local_label_name 284 (bfd *, const char *); 285 #define _bfd_ecoff_get_lineno _bfd_nosymbols_get_lineno 286 extern bfd_boolean _bfd_ecoff_find_nearest_line 287 (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **, 288 unsigned int *); 289 #define _bfd_ecoff_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol 290 #define _bfd_ecoff_read_minisymbols _bfd_generic_read_minisymbols 291 #define _bfd_ecoff_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol 292 #define _bfd_ecoff_find_inliner_info _bfd_nosymbols_find_inliner_info 293 294 #define _bfd_ecoff_get_reloc_upper_bound coff_get_reloc_upper_bound 295 extern long _bfd_ecoff_canonicalize_reloc 296 (bfd *, asection *, arelent **, asymbol **symbols); 297 /* ecoff_bfd_reloc_type_lookup defined by backend. */ 298 299 extern bfd_boolean _bfd_ecoff_set_arch_mach 300 (bfd *, enum bfd_architecture, unsigned long); 301 extern bfd_boolean _bfd_ecoff_set_section_contents 302 (bfd *, asection *, const void * location, file_ptr, bfd_size_type); 303 304 extern int _bfd_ecoff_sizeof_headers (bfd *, bfd_boolean); 305 /* ecoff_bfd_get_relocated_section_contents defined by backend. */ 306 /* ecoff_bfd_relax_section defined by backend. */ 307 extern struct bfd_link_hash_table *_bfd_ecoff_bfd_link_hash_table_create 308 (bfd *); 309 #define _bfd_ecoff_bfd_link_hash_table_free _bfd_generic_link_hash_table_free 310 extern bfd_boolean _bfd_ecoff_bfd_link_add_symbols 311 (bfd *, struct bfd_link_info *); 312 #define _bfd_ecoff_bfd_link_just_syms _bfd_generic_link_just_syms 313 extern bfd_boolean _bfd_ecoff_bfd_final_link 314 (bfd *, struct bfd_link_info *); 315 316 /* Hook functions for the generic COFF section reading code. */ 317 318 extern void * _bfd_ecoff_mkobject_hook (bfd *, void *, void *); 319 #define _bfd_ecoff_set_alignment_hook \ 320 ((void (*) (bfd *, asection *, void *)) bfd_void) 321 extern bfd_boolean _bfd_ecoff_set_arch_mach_hook 322 (bfd *, void *); 323 extern bfd_boolean _bfd_ecoff_styp_to_sec_flags 324 (bfd *, void *, const char *, asection *, flagword *); 325 extern bfd_boolean _bfd_ecoff_slurp_symbol_table (bfd *); 326 327 /* ECOFF auxiliary information swapping routines. These are the same 328 for all ECOFF targets, so they are defined in ecofflink.c. */ 329 330 extern void _bfd_ecoff_swap_tir_in 331 (int, const struct tir_ext *, TIR *); 332 extern void _bfd_ecoff_swap_tir_out 333 (int, const TIR *, struct tir_ext *); 334 extern void _bfd_ecoff_swap_rndx_in 335 (int, const struct rndx_ext *, RNDXR *); 336 extern void _bfd_ecoff_swap_rndx_out 337 (int, const RNDXR *, struct rndx_ext *); 338