bfd/libecoff.h

   1 /* BFD ECOFF object file private structure.
   2    Copyright (C) 1993-2022 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   bool 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   bool (*relocate_section)
  69     (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, void *);
  70   /* Do final adjustments to filehdr and aouthdr.  */
  71   bool (*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, struct bfd_link_info *);
  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   bool linker;
 136
 137   /* TRUE if a warning that multiple global pointer values are
 138      needed in the output binary was issued already.  */
 139   bool 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   bool 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   bool 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 bool _bfd_ecoff_mkobject (bfd *);
 228
 229 /* Read in the ECOFF symbolic debugging information.  */
 230 extern bool _bfd_ecoff_slurp_symbolic_info
 231   (bfd *, asection *, struct ecoff_debug_info *);
 232
 233 /* Generic ECOFF BFD backend vectors.  */
 234
 235 extern bool _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 bool _bfd_ecoff_new_section_hook
 240   (bfd *, asection *);
 241 extern bool _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 bool _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 bool _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 bool _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_bool_bfd_true
 279 #define _bfd_ecoff_bfd_is_target_special_symbol _bfd_bool_bfd_asymbol_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 #define _bfd_ecoff_get_symbol_version_string \
 289   _bfd_nosymbols_get_symbol_version_string
 290 extern bool _bfd_ecoff_bfd_is_local_label_name
 291   (bfd *, const char *);
 292 #define _bfd_ecoff_get_lineno _bfd_nosymbols_get_lineno
 293 extern bool _bfd_ecoff_find_nearest_line
 294   (bfd *, asymbol **, asection *, bfd_vma,
 295    const char **, const char **, unsigned int *, unsigned int *);
 296 #define _bfd_ecoff_find_line _bfd_nosymbols_find_line
 297 #define _bfd_ecoff_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
 298 #define _bfd_ecoff_read_minisymbols _bfd_generic_read_minisymbols
 299 #define _bfd_ecoff_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
 300 #define _bfd_ecoff_find_inliner_info _bfd_nosymbols_find_inliner_info
 301
 302 #define _bfd_ecoff_get_reloc_upper_bound coff_get_reloc_upper_bound
 303 extern long _bfd_ecoff_canonicalize_reloc
 304   (bfd *, asection *, arelent **, asymbol **);
 305 /* ecoff_bfd_reloc_type_lookup defined by backend. */
 306
 307 extern bool _bfd_ecoff_set_arch_mach
 308   (bfd *, enum bfd_architecture, unsigned long);
 309 extern bool _bfd_ecoff_set_section_contents
 310   (bfd *, asection *, const void * location, file_ptr, bfd_size_type);
 311
 312 extern int _bfd_ecoff_sizeof_headers (bfd *, struct bfd_link_info *);
 313 /* ecoff_bfd_get_relocated_section_contents defined by backend.  */
 314 /* ecoff_bfd_relax_section defined by backend.  */
 315 extern struct bfd_link_hash_table *_bfd_ecoff_bfd_link_hash_table_create
 316   (bfd *);
 317 extern bool _bfd_ecoff_bfd_link_add_symbols
 318   (bfd *, struct bfd_link_info *);
 319 #define _bfd_ecoff_bfd_link_just_syms _bfd_generic_link_just_syms
 320 #define _bfd_ecoff_bfd_copy_link_hash_symbol_type \
 321   _bfd_generic_copy_link_hash_symbol_type
 322 extern bool _bfd_ecoff_bfd_final_link
 323   (bfd *, struct bfd_link_info *);
 324
 325 /* Hook functions for the generic COFF section reading code.  */
 326
 327 extern void * _bfd_ecoff_mkobject_hook (bfd *, void *, void *);
 328 extern void _bfd_ecoff_set_alignment_hook
 329   (bfd *, asection *, void *);
 330 extern bool _bfd_ecoff_set_arch_mach_hook
 331   (bfd *, void *);
 332 extern bool _bfd_ecoff_no_long_sections
 333   (bfd *abfd, int enable);
 334 extern bool _bfd_ecoff_styp_to_sec_flags
 335   (bfd *, void *, const char *, asection *, flagword *);
 336 extern bool _bfd_ecoff_slurp_symbol_table (bfd *);
 337
 338 /* ECOFF auxiliary information swapping routines.  These are the same
 339    for all ECOFF targets, so they are defined in ecofflink.c.  */
 340
 341 extern void _bfd_ecoff_swap_tir_in
 342   (int, const struct tir_ext *, TIR *);
 343 extern void _bfd_ecoff_swap_tir_out
 344   (int, const TIR *, struct tir_ext *);
 345 extern void _bfd_ecoff_swap_rndx_in
 346   (int, const struct rndx_ext *, RNDXR *);
 347 extern void _bfd_ecoff_swap_rndx_out
 348   (int, const RNDXR *, struct rndx_ext *);