bfd/libecoff.h

   1 /* BFD ECOFF object file private structure.
   2    Copyright (C) 1993 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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  20
  21 #include "bfdlink.h"
  22
  23 #ifndef ECOFF_H
  24 #include "coff/ecoff.h"
  25 #endif
  26
  27 /* This is the backend information kept for ECOFF files.  This
  28    structure is constant for a particular backend.  The first element
  29    is the COFF backend data structure, so that ECOFF targets can use
  30    the generic COFF code.  */
  31
  32 #define ecoff_backend(abfd) \
  33   ((struct ecoff_backend_data *) (abfd)->xvec->backend_data)
  34
  35 struct ecoff_backend_data
  36 {
  37   /* COFF backend information.  This must be the first field.  */
  38   bfd_coff_backend_data coff;
  39   /* Supported architecture.  */
  40   enum bfd_architecture arch;
  41   /* Initial portion of armap string.  */
  42   const char *armap_start;
  43   /* The page boundary used to align sections in a demand-paged
  44      executable file.  E.g., 0x1000.  */
  45   bfd_vma round;
  46   /* True if the .rdata section is part of the text segment, as on the
  47      Alpha.  False if .rdata is part of the data segment, as on the
  48      MIPS.  */
  49   boolean rdata_in_text;
  50   /* Bitsize of constructor entries.  */
  51   unsigned int constructor_bitsize;
  52   /* Reloc to use for constructor entries.  */
  53   reloc_howto_type *constructor_reloc;
  54   /* How to swap debugging information.  */
  55   struct ecoff_debug_swap debug_swap;
  56   /* External reloc size.  */
  57   bfd_size_type external_reloc_size;
  58   /* Reloc swapping functions.  */
  59   void (*swap_reloc_in) PARAMS ((bfd *, PTR, struct internal_reloc *));
  60   void (*swap_reloc_out) PARAMS ((bfd *, const struct internal_reloc *, PTR));
  61   /* Backend reloc tweaking.  */
  62   void (*adjust_reloc_in) PARAMS ((bfd *, const struct internal_reloc *,
  63                                    arelent *));
  64   void (*adjust_reloc_out) PARAMS ((bfd *, const arelent *,
  65                                     struct internal_reloc *));
  66   /* Relocate section contents while linking.  */
  67   boolean (*relocate_section) PARAMS ((bfd *output_bfd, struct bfd_link_info *,
  68                                        bfd *input_bfd, asection *input_section,
  69                                        bfd_byte *contents,
  70                                        PTR external_relocs));
  71   /* Do final adjustments to filehdr and aouthdr.  */
  72   boolean (*adjust_headers) PARAMS ((bfd *, struct internal_filehdr *,
  73                                      struct internal_aouthdr *));
  74 };
  75
  76 /* This is the target specific information kept for ECOFF files.  */
  77
  78 #define ecoff_data(abfd) ((abfd)->tdata.ecoff_obj_data)
  79
  80 typedef struct ecoff_tdata
  81 {
  82   /* The reloc file position, set by
  83      ecoff_compute_section_file_positions.  */
  84   file_ptr reloc_filepos;
  85
  86   /* The symbol table file position, set by _bfd_ecoff_mkobject_hook.  */
  87   file_ptr sym_filepos;
  88
  89   /* The start and end of the text segment.  Only valid for an
  90      existing file, not for one we are creating.  */
  91   unsigned long text_start;
  92   unsigned long text_end;
  93
  94   /* The cached gp value.  This is used when relocating.  */
  95   bfd_vma gp;
  96
  97   /* The maximum size of objects to optimize using gp.  This is
  98      typically set by the -G option to the compiler, assembler or
  99      linker.  */
 100   unsigned int gp_size;
 101
 102   /* The register masks.  When linking, all the masks found in the
 103      input files are combined into the masks of the output file.
 104      These are not all used for all targets, but that's OK, because
 105      the relevant ones are the only ones swapped in and out.  */
 106   unsigned long gprmask;
 107   unsigned long fprmask;
 108   unsigned long cprmask[4];
 109
 110   /* The ECOFF symbolic debugging information.  */
 111   struct ecoff_debug_info debug_info;
 112
 113   /* The unswapped ECOFF symbolic information.  */
 114   PTR raw_syments;
 115
 116   /* The canonical BFD symbols.  */
 117   struct ecoff_symbol_struct *canonical_symbols;
 118
 119   /* A mapping from external symbol numbers to entries in the linker
 120      hash table, used when linking.  */
 121   struct ecoff_link_hash_entry **sym_hashes;
 122
 123   /* A mapping from reloc symbol indices to sections, used when
 124      linking.  */
 125   asection **symndx_to_section;
 126
 127   /* True if this BFD was written by the backend linker.  */
 128   boolean linker;
 129
 130   /* Used by find_nearest_line entry point.  The structure could be
 131      included directly in this one, but there's no point to wasting
 132      the memory just for the infrequently called find_nearest_line.  */
 133   struct ecoff_find_line *find_line_info;
 134
 135 } ecoff_data_type;
 136
 137 /* Each canonical asymbol really looks like this.  */
 138
 139 typedef struct ecoff_symbol_struct
 140 {
 141   /* The actual symbol which the rest of BFD works with */
 142   asymbol symbol;
 143
 144   /* The fdr for this symbol.  */
 145   FDR *fdr;
 146
 147   /* true if this is a local symbol rather than an external one.  */
 148   boolean local;
 149
 150   /* A pointer to the unswapped hidden information for this symbol.
 151      This is either a struct sym_ext or a struct ext_ext, depending on
 152      the value of the local field above.  */
 153   PTR native;
 154 } ecoff_symbol_type;
 155
 156 /* We take the address of the first element of a asymbol to ensure that the
 157    macro is only ever applied to an asymbol.  */
 158 #define ecoffsymbol(asymbol) ((ecoff_symbol_type *) (&((asymbol)->the_bfd)))
 159
 160 /* We need to save the index of an external symbol when we write it
 161    out so that can set the symbol index correctly when we write out
 162    the relocs.  */
 163 #define ecoff_get_sym_index(symbol) ((symbol)->udata.i)
 164 #define ecoff_set_sym_index(symbol, idx) ((symbol)->udata.i = (idx))
 165
 166 /* When generating MIPS embedded PIC code, the linker relaxes the code
 167    to turn PC relative branches into longer code sequences when the PC
 168    relative branch is out of range.  This involves reading the relocs
 169    in bfd_relax_section as well as in bfd_final_link, and requires the
 170    code to keep track of which relocs have been expanded.  A pointer
 171    to this structure is put in the used_by_bfd pointer of a section to
 172    keep track of this information.  The user_by_bfd pointer will be
 173    NULL if the information was not needed.  */
 174
 175 struct ecoff_section_tdata
 176 {
 177   /* The unswapped relocs for this section.  These are stored in
 178      memory so the input file does not have to be read twice.  */
 179   PTR external_relocs;
 180
 181   /* The contents of the section.  These bytes may or may not be saved
 182      in memory, but if it is this is a pointer to them.  */
 183   bfd_byte *contents;
 184
 185   /* Offset adjustments for PC relative branches.  A number other than
 186      1 is an addend for a PC relative branch, or a switch table entry
 187      which is the difference of two .text locations; this addend
 188      arises because the branch or difference crosses one or more
 189      branches which were expanded into a larger code sequence.  A 1
 190      means that this branch was itself expanded into a larger code
 191      sequence.  1 is not a possible offset, since all offsets must be
 192      multiples of the instruction size, which is 4; also, the only
 193      relocs with non-zero offsets will be PC relative branches or
 194      switch table entries within the same object file.  If this field
 195      is NULL, no branches were expanded and no offsets are required.
 196      Otherwise there are as many entries as there are relocs in the
 197      section, and the entry for any reloc that is not PC relative is
 198      zero.  */
 199   long *offsets;
 200 };
 201
 202 /* An accessor macro for the ecoff_section_tdata structure.  */
 203 #define ecoff_section_data(abfd, sec) \
 204   ((struct ecoff_section_tdata *) (sec)->used_by_bfd)
 205
 206 /* ECOFF linker hash table entries.  */
 207
 208 struct ecoff_link_hash_entry
 209 {
 210   struct bfd_link_hash_entry root;
 211   /* Symbol index in output file.  */
 212   long indx;
 213   /* BFD that ext field value came from.  */
 214   bfd *abfd;
 215   /* ECOFF external symbol information.  */
 216   EXTR esym;
 217   /* Nonzero if this symbol has been written out.  */
 218   char written;
 219   /* Nonzero if this symbol was referred to as small undefined.  */
 220   char small;
 221 };
 222
 223 /* ECOFF linker hash table.  */
 224
 225 struct ecoff_link_hash_table
 226 {
 227   struct bfd_link_hash_table root;
 228 };
 229
 230 /* Make an ECOFF object.  */
 231 extern boolean _bfd_ecoff_mkobject PARAMS ((bfd *));
 232
 233 /* Read in the ECOFF symbolic debugging information.  */
 234 extern boolean _bfd_ecoff_slurp_symbolic_info
 235   PARAMS ((bfd *, asection *, struct ecoff_debug_info *));
 236
 237 /* Generic ECOFF BFD backend vectors.  */
 238
 239 extern boolean _bfd_ecoff_write_object_contents PARAMS ((bfd *abfd));
 240 extern const bfd_target *_bfd_ecoff_archive_p PARAMS ((bfd *abfd));
 241
 242 #define _bfd_ecoff_close_and_cleanup _bfd_generic_close_and_cleanup
 243 #define _bfd_ecoff_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
 244 extern boolean _bfd_ecoff_new_section_hook
 245   PARAMS ((bfd *, asection *));
 246 extern boolean _bfd_ecoff_get_section_contents
 247   PARAMS ((bfd *, asection *, PTR location, file_ptr, bfd_size_type));
 248
 249 #define _bfd_ecoff_bfd_link_split_section _bfd_generic_link_split_section
 250
 251 extern boolean _bfd_ecoff_bfd_copy_private_bfd_data PARAMS ((bfd *, bfd *));
 252 #define _bfd_ecoff_bfd_copy_private_section_data \
 253   _bfd_generic_bfd_copy_private_section_data
 254
 255 #define _bfd_ecoff_bfd_copy_private_symbol_data \
 256   _bfd_generic_bfd_copy_private_symbol_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 boolean _bfd_ecoff_slurp_armap PARAMS ((bfd *abfd));
 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 boolean _bfd_ecoff_write_armap
 271   PARAMS ((bfd *, unsigned int, struct orl *, unsigned int, int));
 272 #define _bfd_ecoff_openr_next_archived_file \
 273   bfd_generic_openr_next_archived_file
 274 #define _bfd_ecoff_generic_stat_arch_elt bfd_generic_stat_arch_elt
 275 #define _bfd_ecoff_update_armap_timestamp bfd_true
 276
 277 extern long _bfd_ecoff_get_symtab_upper_bound PARAMS ((bfd *abfd));
 278 extern long _bfd_ecoff_get_symtab PARAMS ((bfd *abfd, asymbol **alocation));
 279 extern asymbol *_bfd_ecoff_make_empty_symbol PARAMS ((bfd *abfd));
 280 extern void _bfd_ecoff_print_symbol
 281   PARAMS ((bfd *, PTR filep, asymbol *, bfd_print_symbol_type));
 282 extern void _bfd_ecoff_get_symbol_info
 283   PARAMS ((bfd *, asymbol *, symbol_info *));
 284 extern boolean _bfd_ecoff_bfd_is_local_label
 285   PARAMS ((bfd *, asymbol *));
 286 #define _bfd_ecoff_get_lineno _bfd_nosymbols_get_lineno
 287 extern boolean _bfd_ecoff_find_nearest_line
 288   PARAMS ((bfd *, asection *, asymbol **, bfd_vma offset,
 289            const char **filename_ptr, const char **fnname_ptr,
 290            unsigned int *retline_ptr));
 291 #define _bfd_ecoff_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
 292 #define _bfd_ecoff_read_minisymbols _bfd_generic_read_minisymbols
 293 #define _bfd_ecoff_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
 294
 295 #define _bfd_ecoff_get_reloc_upper_bound coff_get_reloc_upper_bound
 296 extern long _bfd_ecoff_canonicalize_reloc
 297   PARAMS ((bfd *, asection *, arelent **, asymbol **symbols));
 298 /* ecoff_bfd_reloc_type_lookup defined by backend. */
 299
 300 extern boolean _bfd_ecoff_set_arch_mach
 301   PARAMS ((bfd *, enum bfd_architecture, unsigned long machine));
 302 extern boolean _bfd_ecoff_set_section_contents
 303   PARAMS ((bfd *, asection *, PTR location, file_ptr, bfd_size_type));
 304
 305 extern int _bfd_ecoff_sizeof_headers PARAMS ((bfd *abfd, boolean reloc));
 306 /* ecoff_bfd_get_relocated_section_contents defined by backend.  */
 307 /* ecoff_bfd_relax_section defined by backend.  */
 308 extern struct bfd_link_hash_table *_bfd_ecoff_bfd_link_hash_table_create
 309   PARAMS ((bfd *));
 310 extern boolean _bfd_ecoff_bfd_link_add_symbols
 311   PARAMS ((bfd *, struct bfd_link_info *));
 312 extern boolean _bfd_ecoff_bfd_final_link
 313   PARAMS ((bfd *, struct bfd_link_info *));
 314
 315 /* Hook functions for the generic COFF section reading code.  */
 316
 317 extern PTR _bfd_ecoff_mkobject_hook PARAMS ((bfd *, PTR filehdr, PTR aouthdr));
 318 #define _bfd_ecoff_set_alignment_hook \
 319   ((void (*) PARAMS ((bfd *, asection *, PTR))) bfd_void)
 320 extern boolean _bfd_ecoff_set_arch_mach_hook PARAMS ((bfd *abfd, PTR filehdr));
 321 extern flagword _bfd_ecoff_styp_to_sec_flags
 322   PARAMS ((bfd *abfd, PTR hdr, const char *name));
 323 extern boolean _bfd_ecoff_slurp_symbol_table PARAMS ((bfd *abfd));
 324
 325 /* ECOFF auxiliary information swapping routines.  These are the same
 326    for all ECOFF targets, so they are defined in ecofflink.c.  */
 327
 328 extern void _bfd_ecoff_swap_tir_in
 329   PARAMS ((int, const struct tir_ext *, TIR *));
 330 extern void _bfd_ecoff_swap_tir_out
 331   PARAMS ((int, const TIR *, struct tir_ext *));
 332 extern void _bfd_ecoff_swap_rndx_in
 333   PARAMS ((int, const struct rndx_ext *, RNDXR *));
 334 extern void _bfd_ecoff_swap_rndx_out
 335   PARAMS ((int, const RNDXR *, struct rndx_ext *));