bfd/libecoff.h

   1 /* BFD ECOFF object file private structure.
   2    Copyright 1993, 1994, 1995, 1996, 1999, 2001, 2002, 2003, 2004,
   3    2005, 2006, 2007, 2008, 2009, 2010
   4    Free Software Foundation, Inc.
   5    Written by Ian Lance Taylor, Cygnus Support.
   6
   7    This file is part of BFD, the Binary File Descriptor library.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  22    MA 02110-1301, USA.  */
  23
  24 #include "bfdlink.h"
  25
  26 #ifndef ECOFF_H
  27 #include "coff/ecoff.h"
  28 #endif
  29
  30 /* This is the backend information kept for ECOFF files.  This
  31    structure is constant for a particular backend.  The first element
  32    is the COFF backend data structure, so that ECOFF targets can use
  33    the generic COFF code.  */
  34
  35 #define ecoff_backend(abfd) \
  36   ((struct ecoff_backend_data *) (abfd)->xvec->backend_data)
  37
  38 struct ecoff_backend_data
  39 {
  40   /* COFF backend information.  This must be the first field.  */
  41   bfd_coff_backend_data coff;
  42   /* Supported architecture.  */
  43   enum bfd_architecture arch;
  44   /* Initial portion of armap string.  */
  45   const char *armap_start;
  46   /* The page boundary used to align sections in a demand-paged
  47      executable file.  E.g., 0x1000.  */
  48   bfd_vma round;
  49   /* TRUE if the .rdata section is part of the text segment, as on the
  50      Alpha.  FALSE if .rdata is part of the data segment, as on the
  51      MIPS.  */
  52   bfd_boolean rdata_in_text;
  53   /* Bitsize of constructor entries.  */
  54   unsigned int constructor_bitsize;
  55   /* Reloc to use for constructor entries.  */
  56   reloc_howto_type *constructor_reloc;
  57   /* How to swap debugging information.  */
  58   struct ecoff_debug_swap debug_swap;
  59   /* External reloc size.  */
  60   bfd_size_type external_reloc_size;
  61   /* Reloc swapping functions.  */
  62   void (*swap_reloc_in) (bfd *, void *, struct internal_reloc *);
  63   void (*swap_reloc_out) (bfd *, const struct internal_reloc *, void *);
  64   /* Backend reloc tweaking.  */
  65   void (*adjust_reloc_in)
  66     (bfd *, const struct internal_reloc *, arelent *);
  67   void (*adjust_reloc_out)
  68     (bfd *, const arelent *, struct internal_reloc *);
  69   /* Relocate section contents while linking.  */
  70   bfd_boolean (*relocate_section)
  71     (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, void *);
  72   /* Do final adjustments to filehdr and aouthdr.  */
  73   bfd_boolean (*adjust_headers)
  74     (bfd *, struct internal_filehdr *, struct internal_aouthdr *);
  75   /* Read an element from an archive at a given file position.  This
  76      is needed because OSF/1 3.2 uses a weird archive format.  */
  77   bfd *(*get_elt_at_filepos) (bfd *, file_ptr);
  78 };
  79
  80 /* ECOFF targets don't support COFF long section names, so this
  81   macro is provided to use as an initialiser for the related
  82   members of the embedded bfd_coff_backend_data struct.  */
  83 #define ECOFF_NO_LONG_SECTION_NAMES (FALSE), _bfd_ecoff_no_long_sections
  84
  85 /* This is the target specific information kept for ECOFF files.  */
  86
  87 #define ecoff_data(abfd) ((abfd)->tdata.ecoff_obj_data)
  88
  89 typedef struct ecoff_tdata
  90 {
  91   /* The reloc file position, set by
  92      ecoff_compute_section_file_positions.  */
  93   file_ptr reloc_filepos;
  94
  95   /* The symbol table file position, set by _bfd_ecoff_mkobject_hook.  */
  96   file_ptr sym_filepos;
  97
  98   /* The start and end of the text segment.  Only valid for an
  99      existing file, not for one we are creating.  */
 100   unsigned long text_start;
 101   unsigned long text_end;
 102
 103   /* The cached gp value.  This is used when relocating.  */
 104   bfd_vma gp;
 105
 106   /* The maximum size of objects to optimize using gp.  This is
 107      typically set by the -G option to the compiler, assembler or
 108      linker.  */
 109   unsigned int gp_size;
 110
 111   /* The register masks.  When linking, all the masks found in the
 112      input files are combined into the masks of the output file.
 113      These are not all used for all targets, but that's OK, because
 114      the relevant ones are the only ones swapped in and out.  */
 115   unsigned long gprmask;
 116   unsigned long fprmask;
 117   unsigned long cprmask[4];
 118
 119   /* The ECOFF symbolic debugging information.  */
 120   struct ecoff_debug_info debug_info;
 121
 122   /* The unswapped ECOFF symbolic information.  */
 123   void * raw_syments;
 124
 125   /* The canonical BFD symbols.  */
 126   struct ecoff_symbol_struct *canonical_symbols;
 127
 128   /* A mapping from external symbol numbers to entries in the linker
 129      hash table, used when linking.  */
 130   struct ecoff_link_hash_entry **sym_hashes;
 131
 132   /* A mapping from reloc symbol indices to sections, used when
 133      linking.  */
 134   asection **symndx_to_section;
 135
 136   /* TRUE if this BFD was written by the backend linker.  */
 137   bfd_boolean linker;
 138
 139   /* TRUE if a warning that multiple global pointer values are
 140      needed in the output binary was issued already.  */
 141   bfd_boolean issued_multiple_gp_warning;
 142
 143   /* Used by find_nearest_line entry point.  The structure could be
 144      included directly in this one, but there's no point to wasting
 145      the memory just for the infrequently called find_nearest_line.  */
 146   struct ecoff_find_line *find_line_info;
 147
 148   /* Whether the .rdata section is in the text segment for this
 149      particular ECOFF file.  This is not valid until
 150      ecoff_compute_section_file_positions is called.  */
 151   bfd_boolean rdata_in_text;
 152
 153 } ecoff_data_type;
 154
 155 /* Each canonical asymbol really looks like this.  */
 156
 157 typedef struct ecoff_symbol_struct
 158 {
 159   /* The actual symbol which the rest of BFD works with */
 160   asymbol symbol;
 161
 162   /* The fdr for this symbol.  */
 163   FDR *fdr;
 164
 165   /* TRUE if this is a local symbol rather than an external one.  */
 166   bfd_boolean local;
 167
 168   /* A pointer to the unswapped hidden information for this symbol.
 169      This is either a struct sym_ext or a struct ext_ext, depending on
 170      the value of the local field above.  */
 171   void * native;
 172 } ecoff_symbol_type;
 173
 174 /* We take the address of the first element of an asymbol to ensure that the
 175    macro is only ever applied to an asymbol.  */
 176 #define ecoffsymbol(asymbol) ((ecoff_symbol_type *) (&((asymbol)->the_bfd)))
 177
 178 /* We need to save the index of an external symbol when we write it
 179    out so that can set the symbol index correctly when we write out
 180    the relocs.  */
 181 #define ecoff_get_sym_index(symbol) ((symbol)->udata.i)
 182 #define ecoff_set_sym_index(symbol, idx) ((symbol)->udata.i = (idx))
 183
 184 /* A pointer to this structure is put in the used_by_bfd pointer of
 185    a section to keep track of any per-section data.
 186    The user_by_bfd pointer will be NULL if the information was not
 187    needed.  */
 188
 189 struct ecoff_section_tdata
 190 {
 191   /* When producing an executable (i.e., final, non-relocatable link)
 192      on the Alpha, we may need to use multiple global pointer values
 193      to span the entire .lita section.  In essence, we allow each
 194      input .lita section to have its own gp value.  To support this,
 195      we need to keep track of the gp values that we picked for each
 196      input .lita section . */
 197   bfd_vma gp;
 198 };
 199
 200 /* An accessor macro for the ecoff_section_tdata structure.  */
 201 #define ecoff_section_data(abfd, sec) \
 202   ((struct ecoff_section_tdata *) (sec)->used_by_bfd)
 203
 204 /* ECOFF linker hash table entries.  */
 205
 206 struct ecoff_link_hash_entry
 207 {
 208   struct bfd_link_hash_entry root;
 209   /* Symbol index in output file.  */
 210   long indx;
 211   /* BFD that ext field value came from.  */
 212   bfd *abfd;
 213   /* ECOFF external symbol information.  */
 214   EXTR esym;
 215   /* Nonzero if this symbol has been written out.  */
 216   char written;
 217   /* Nonzero if this symbol was referred to as small undefined.  */
 218   char small;
 219 };
 220
 221 /* ECOFF linker hash table.  */
 222
 223 struct ecoff_link_hash_table
 224 {
 225   struct bfd_link_hash_table root;
 226 };
 227
 228 /* Make an ECOFF object.  */
 229 extern bfd_boolean _bfd_ecoff_mkobject (bfd *);
 230
 231 /* Read in the ECOFF symbolic debugging information.  */
 232 extern bfd_boolean _bfd_ecoff_slurp_symbolic_info
 233   (bfd *, asection *, struct ecoff_debug_info *);
 234
 235 /* Generic ECOFF BFD backend vectors.  */
 236
 237 extern bfd_boolean _bfd_ecoff_write_object_contents (bfd *);
 238
 239 #define _bfd_ecoff_close_and_cleanup _bfd_generic_close_and_cleanup
 240 #define _bfd_ecoff_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
 241 extern bfd_boolean _bfd_ecoff_new_section_hook
 242   (bfd *, asection *);
 243 extern bfd_boolean _bfd_ecoff_get_section_contents
 244   (bfd *, asection *, void * location, file_ptr, bfd_size_type);
 245
 246 #define _bfd_ecoff_bfd_link_split_section _bfd_generic_link_split_section
 247
 248 extern bfd_boolean _bfd_ecoff_bfd_copy_private_bfd_data
 249   (bfd *, bfd *);
 250 #define _bfd_ecoff_bfd_copy_private_section_data \
 251   _bfd_generic_bfd_copy_private_section_data
 252
 253 #define _bfd_ecoff_bfd_copy_private_symbol_data \
 254   _bfd_generic_bfd_copy_private_symbol_data
 255
 256 #define _bfd_ecoff_bfd_copy_private_header_data \
 257   _bfd_generic_bfd_copy_private_header_data
 258
 259 #define _bfd_ecoff_bfd_print_private_bfd_data \
 260   _bfd_generic_bfd_print_private_bfd_data
 261
 262 #define _bfd_ecoff_bfd_merge_private_bfd_data \
 263   _bfd_generic_bfd_merge_private_bfd_data
 264
 265 #define _bfd_ecoff_bfd_set_private_flags _bfd_generic_bfd_set_private_flags
 266 extern bfd_boolean _bfd_ecoff_slurp_armap (bfd *);
 267 #define _bfd_ecoff_slurp_extended_name_table _bfd_slurp_extended_name_table
 268 #define _bfd_ecoff_construct_extended_name_table \
 269   _bfd_archive_bsd_construct_extended_name_table
 270 #define _bfd_ecoff_truncate_arname bfd_dont_truncate_arname
 271 extern bfd_boolean _bfd_ecoff_write_armap
 272   (bfd *, unsigned int, struct orl *, unsigned int, int);
 273 #define _bfd_ecoff_read_ar_hdr _bfd_generic_read_ar_hdr
 274 #define _bfd_ecoff_write_ar_hdr _bfd_generic_write_ar_hdr
 275 #define _bfd_ecoff_openr_next_archived_file \
 276   bfd_generic_openr_next_archived_file
 277 #define _bfd_ecoff_get_elt_at_index _bfd_generic_get_elt_at_index
 278 #define _bfd_ecoff_generic_stat_arch_elt bfd_generic_stat_arch_elt
 279 #define _bfd_ecoff_update_armap_timestamp bfd_true
 280 #define _bfd_ecoff_bfd_is_target_special_symbol  \
 281   ((bfd_boolean (*) (bfd *, asymbol *)) bfd_false)
 282
 283 extern long _bfd_ecoff_get_symtab_upper_bound (bfd *);
 284 extern long _bfd_ecoff_canonicalize_symtab (bfd *, asymbol **);
 285 extern asymbol *_bfd_ecoff_make_empty_symbol (bfd *);
 286 extern void _bfd_ecoff_print_symbol
 287   (bfd *, void *, asymbol *, bfd_print_symbol_type);
 288 extern void _bfd_ecoff_get_symbol_info
 289   (bfd *, asymbol *, symbol_info *);
 290 extern bfd_boolean _bfd_ecoff_bfd_is_local_label_name
 291   (bfd *, const char *);
 292 #define _bfd_ecoff_get_lineno _bfd_nosymbols_get_lineno
 293 extern bfd_boolean _bfd_ecoff_find_nearest_line
 294   (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **,
 295    unsigned int *);
 296 #define _bfd_ecoff_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
 297 #define _bfd_ecoff_read_minisymbols _bfd_generic_read_minisymbols
 298 #define _bfd_ecoff_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
 299 #define _bfd_ecoff_find_inliner_info _bfd_nosymbols_find_inliner_info
 300
 301 #define _bfd_ecoff_get_reloc_upper_bound coff_get_reloc_upper_bound
 302 extern long _bfd_ecoff_canonicalize_reloc
 303   (bfd *, asection *, arelent **, asymbol **symbols);
 304 /* ecoff_bfd_reloc_type_lookup defined by backend. */
 305
 306 extern bfd_boolean _bfd_ecoff_set_arch_mach
 307   (bfd *, enum bfd_architecture, unsigned long);
 308 extern bfd_boolean _bfd_ecoff_set_section_contents
 309   (bfd *, asection *, const void * location, file_ptr, bfd_size_type);
 310
 311 extern int _bfd_ecoff_sizeof_headers (bfd *, struct bfd_link_info *);
 312 /* ecoff_bfd_get_relocated_section_contents defined by backend.  */
 313 /* ecoff_bfd_relax_section defined by backend.  */
 314 extern struct bfd_link_hash_table *_bfd_ecoff_bfd_link_hash_table_create
 315   (bfd *);
 316 #define _bfd_ecoff_bfd_link_hash_table_free _bfd_generic_link_hash_table_free
 317 extern bfd_boolean _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 bfd_boolean _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 #define _bfd_ecoff_set_alignment_hook \
 329   ((void (*) (bfd *, asection *, void *)) bfd_void)
 330 extern bfd_boolean _bfd_ecoff_set_arch_mach_hook
 331   (bfd *, void *);
 332 extern bfd_boolean _bfd_ecoff_no_long_sections
 333   (bfd *abfd, int enable);
 334 extern bfd_boolean _bfd_ecoff_styp_to_sec_flags
 335   (bfd *, void *, const char *, asection *, flagword *);
 336 extern bfd_boolean _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 *);