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[/] [or1k/] [trunk/] [insight/] [bfd/] [libecoff.h] - Blame information for rev 1765

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1 578 markom
/* BFD ECOFF object file private structure.
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   Copyright 1993, 1994, 1995, 1996, 1999 Free Software Foundation, Inc.
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   Written by Ian Lance Taylor, Cygnus Support.
4
 
5
This file is part of BFD, the Binary File Descriptor library.
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7
This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
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#include "bfdlink.h"
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23
#ifndef ECOFF_H
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#include "coff/ecoff.h"
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#endif
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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)
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struct ecoff_backend_data
36
{
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  /* COFF backend information.  This must be the first field.  */
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  bfd_coff_backend_data coff;
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  /* Supported architecture.  */
40
  enum bfd_architecture arch;
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  /* Initial portion of armap string.  */
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  const char *armap_start;
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  /* The page boundary used to align sections in a demand-paged
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     executable file.  E.g., 0x1000.  */
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  bfd_vma round;
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  /* True if the .rdata section is part of the text segment, as on the
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     Alpha.  False if .rdata is part of the data segment, as on the
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     MIPS.  */
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  boolean rdata_in_text;
50
  /* Bitsize of constructor entries.  */
51
  unsigned int constructor_bitsize;
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  /* Reloc to use for constructor entries.  */
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  reloc_howto_type *constructor_reloc;
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  /* How to swap debugging information.  */
55
  struct ecoff_debug_swap debug_swap;
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  /* External reloc size.  */
57
  bfd_size_type external_reloc_size;
58
  /* Reloc swapping functions.  */
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  void (*swap_reloc_in) PARAMS ((bfd *, PTR, struct internal_reloc *));
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  void (*swap_reloc_out) PARAMS ((bfd *, const struct internal_reloc *, PTR));
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  /* Backend reloc tweaking.  */
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  void (*adjust_reloc_in) PARAMS ((bfd *, const struct internal_reloc *,
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                                   arelent *));
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  void (*adjust_reloc_out) PARAMS ((bfd *, const arelent *,
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                                    struct internal_reloc *));
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  /* Relocate section contents while linking.  */
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  boolean (*relocate_section) PARAMS ((bfd *output_bfd, struct bfd_link_info *,
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                                       bfd *input_bfd, asection *input_section,
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                                       bfd_byte *contents,
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                                       PTR external_relocs));
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  /* Do final adjustments to filehdr and aouthdr.  */
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  boolean (*adjust_headers) PARAMS ((bfd *, struct internal_filehdr *,
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                                     struct internal_aouthdr *));
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  /* 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) PARAMS ((bfd *, file_ptr));
77
};
78
 
79
/* This is the target specific information kept for ECOFF files.  */
80
 
81
#define ecoff_data(abfd) ((abfd)->tdata.ecoff_obj_data)
82
 
83
typedef struct ecoff_tdata
84
{
85
  /* The reloc file position, set by
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     ecoff_compute_section_file_positions.  */
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  file_ptr reloc_filepos;
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89
  /* The symbol table file position, set by _bfd_ecoff_mkobject_hook.  */
90
  file_ptr sym_filepos;
91
 
92
  /* The start and end of the text segment.  Only valid for an
93
     existing file, not for one we are creating.  */
94
  unsigned long text_start;
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  unsigned long text_end;
96
 
97
  /* The cached gp value.  This is used when relocating.  */
98
  bfd_vma gp;
99
 
100
  /* The maximum size of objects to optimize using gp.  This is
101
     typically set by the -G option to the compiler, assembler or
102
     linker.  */
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  unsigned int gp_size;
104
 
105
  /* The register masks.  When linking, all the masks found in the
106
     input files are combined into the masks of the output file.
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     These are not all used for all targets, but that's OK, because
108
     the relevant ones are the only ones swapped in and out.  */
109
  unsigned long gprmask;
110
  unsigned long fprmask;
111
  unsigned long cprmask[4];
112
 
113
  /* The ECOFF symbolic debugging information.  */
114
  struct ecoff_debug_info debug_info;
115
 
116
  /* The unswapped ECOFF symbolic information.  */
117
  PTR raw_syments;
118
 
119
  /* The canonical BFD symbols.  */
120
  struct ecoff_symbol_struct *canonical_symbols;
121
 
122
  /* A mapping from external symbol numbers to entries in the linker
123
     hash table, used when linking.  */
124
  struct ecoff_link_hash_entry **sym_hashes;
125
 
126
  /* A mapping from reloc symbol indices to sections, used when
127
     linking.  */
128
  asection **symndx_to_section;
129
 
130
  /* True if this BFD was written by the backend linker.  */
131
  boolean linker;
132
 
133
  /* True if a warning that multiple global pointer values are
134
     needed in the output binary was issued already.  */
135
  boolean issued_multiple_gp_warning;
136
 
137
  /* Used by find_nearest_line entry point.  The structure could be
138
     included directly in this one, but there's no point to wasting
139
     the memory just for the infrequently called find_nearest_line.  */
140
  struct ecoff_find_line *find_line_info;
141
 
142
  /* Whether the .rdata section is in the text segment for this
143
     particular ECOFF file.  This is not valid until
144
     ecoff_compute_section_file_positions is called.  */
145
  boolean rdata_in_text;
146
 
147
} ecoff_data_type;
148
 
149
/* Each canonical asymbol really looks like this.  */
150
 
151
typedef struct ecoff_symbol_struct
152
{
153
  /* The actual symbol which the rest of BFD works with */
154
  asymbol symbol;
155
 
156
  /* The fdr for this symbol.  */
157
  FDR *fdr;
158
 
159
  /* true if this is a local symbol rather than an external one.  */
160
  boolean local;
161
 
162
  /* A pointer to the unswapped hidden information for this symbol.
163
     This is either a struct sym_ext or a struct ext_ext, depending on
164
     the value of the local field above.  */
165
  PTR native;
166
} ecoff_symbol_type;
167
 
168
/* We take the address of the first element of a asymbol to ensure that the
169
   macro is only ever applied to an asymbol.  */
170
#define ecoffsymbol(asymbol) ((ecoff_symbol_type *) (&((asymbol)->the_bfd)))
171
 
172
/* We need to save the index of an external symbol when we write it
173
   out so that can set the symbol index correctly when we write out
174
   the relocs.  */
175
#define ecoff_get_sym_index(symbol) ((symbol)->udata.i)
176
#define ecoff_set_sym_index(symbol, idx) ((symbol)->udata.i = (idx))
177
 
178
/* When generating MIPS embedded PIC code, the linker relaxes the code
179
   to turn PC relative branches into longer code sequences when the PC
180
   relative branch is out of range.  This involves reading the relocs
181
   in bfd_relax_section as well as in bfd_final_link, and requires the
182
   code to keep track of which relocs have been expanded.  A pointer
183
   to this structure is put in the used_by_bfd pointer of a section to
184
   keep track of this information.  The user_by_bfd pointer will be
185
   NULL if the information was not needed.  */
186
 
187
struct ecoff_section_tdata
188
{
189
  /* The unswapped relocs for this section.  These are stored in
190
     memory so the input file does not have to be read twice.  */
191
  PTR external_relocs;
192
 
193
  /* The contents of the section.  These bytes may or may not be saved
194
     in memory, but if it is this is a pointer to them.  */
195
  bfd_byte *contents;
196
 
197
  /* Offset adjustments for PC relative branches.  A number other than
198
     1 is an addend for a PC relative branch, or a switch table entry
199
     which is the difference of two .text locations; this addend
200
     arises because the branch or difference crosses one or more
201
     branches which were expanded into a larger code sequence.  A 1
202
     means that this branch was itself expanded into a larger code
203
     sequence.  1 is not a possible offset, since all offsets must be
204
     multiples of the instruction size, which is 4; also, the only
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     relocs with non-zero offsets will be PC relative branches or
206
     switch table entries within the same object file.  If this field
207
     is NULL, no branches were expanded and no offsets are required.
208
     Otherwise there are as many entries as there are relocs in the
209
     section, and the entry for any reloc that is not PC relative is
210
     zero.  */
211
  long *offsets;
212
 
213
  /* When producing an executable (i.e., final, non-relocatable link)
214
     on the Alpha, we may need to use multiple global pointer values
215
     to span the entire .lita section.  In essence, we allow each
216
     input .lita section to have its own gp value.  To support this,
217
     we need to keep track of the gp values that we picked for each
218
     input .lita section . */
219
  bfd_vma gp;
220
};
221
 
222
/* An accessor macro for the ecoff_section_tdata structure.  */
223
#define ecoff_section_data(abfd, sec) \
224
  ((struct ecoff_section_tdata *) (sec)->used_by_bfd)
225
 
226
/* ECOFF linker hash table entries.  */
227
 
228
struct ecoff_link_hash_entry
229
{
230
  struct bfd_link_hash_entry root;
231
  /* Symbol index in output file.  */
232
  long indx;
233
  /* BFD that ext field value came from.  */
234
  bfd *abfd;
235
  /* ECOFF external symbol information.  */
236
  EXTR esym;
237
  /* Nonzero if this symbol has been written out.  */
238
  char written;
239
  /* Nonzero if this symbol was referred to as small undefined.  */
240
  char small;
241
};
242
 
243
/* ECOFF linker hash table.  */
244
 
245
struct ecoff_link_hash_table
246
{
247
  struct bfd_link_hash_table root;
248
};
249
 
250
/* Make an ECOFF object.  */
251
extern boolean _bfd_ecoff_mkobject PARAMS ((bfd *));
252
 
253
/* Read in the ECOFF symbolic debugging information.  */
254
extern boolean _bfd_ecoff_slurp_symbolic_info
255
  PARAMS ((bfd *, asection *, struct ecoff_debug_info *));
256
 
257
/* Generic ECOFF BFD backend vectors.  */
258
 
259
extern boolean _bfd_ecoff_write_object_contents PARAMS ((bfd *abfd));
260
extern const bfd_target *_bfd_ecoff_archive_p PARAMS ((bfd *abfd));
261
 
262
#define _bfd_ecoff_close_and_cleanup _bfd_generic_close_and_cleanup
263
#define _bfd_ecoff_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
264
extern boolean _bfd_ecoff_new_section_hook
265
  PARAMS ((bfd *, asection *));
266
extern boolean _bfd_ecoff_get_section_contents
267
  PARAMS ((bfd *, asection *, PTR location, file_ptr, bfd_size_type));
268
 
269
#define _bfd_ecoff_bfd_link_split_section _bfd_generic_link_split_section
270
 
271
extern boolean _bfd_ecoff_bfd_copy_private_bfd_data PARAMS ((bfd *, bfd *));
272
#define _bfd_ecoff_bfd_copy_private_section_data \
273
  _bfd_generic_bfd_copy_private_section_data
274
 
275
#define _bfd_ecoff_bfd_copy_private_symbol_data \
276
  _bfd_generic_bfd_copy_private_symbol_data
277
 
278
#define _bfd_ecoff_bfd_print_private_bfd_data \
279
  _bfd_generic_bfd_print_private_bfd_data
280
 
281
#define _bfd_ecoff_bfd_merge_private_bfd_data \
282
  _bfd_generic_bfd_merge_private_bfd_data
283
 
284
#define _bfd_ecoff_bfd_set_private_flags _bfd_generic_bfd_set_private_flags
285
extern boolean _bfd_ecoff_slurp_armap PARAMS ((bfd *abfd));
286
#define _bfd_ecoff_slurp_extended_name_table _bfd_slurp_extended_name_table
287
#define _bfd_ecoff_construct_extended_name_table \
288
  _bfd_archive_bsd_construct_extended_name_table
289
#define _bfd_ecoff_truncate_arname bfd_dont_truncate_arname
290
extern boolean _bfd_ecoff_write_armap
291
  PARAMS ((bfd *, unsigned int, struct orl *, unsigned int, int));
292
#define _bfd_ecoff_read_ar_hdr _bfd_generic_read_ar_hdr
293
#define _bfd_ecoff_openr_next_archived_file \
294
  bfd_generic_openr_next_archived_file
295
#define _bfd_ecoff_get_elt_at_index _bfd_generic_get_elt_at_index
296
#define _bfd_ecoff_generic_stat_arch_elt bfd_generic_stat_arch_elt
297
#define _bfd_ecoff_update_armap_timestamp bfd_true
298
 
299
extern long _bfd_ecoff_get_symtab_upper_bound PARAMS ((bfd *abfd));
300
extern long _bfd_ecoff_get_symtab PARAMS ((bfd *abfd, asymbol **alocation));
301
extern asymbol *_bfd_ecoff_make_empty_symbol PARAMS ((bfd *abfd));
302
extern void _bfd_ecoff_print_symbol
303
  PARAMS ((bfd *, PTR filep, asymbol *, bfd_print_symbol_type));
304
extern void _bfd_ecoff_get_symbol_info
305
  PARAMS ((bfd *, asymbol *, symbol_info *));
306
extern boolean _bfd_ecoff_bfd_is_local_label_name
307
  PARAMS ((bfd *, const char *));
308
#define _bfd_ecoff_get_lineno _bfd_nosymbols_get_lineno
309
extern boolean _bfd_ecoff_find_nearest_line
310
  PARAMS ((bfd *, asection *, asymbol **, bfd_vma offset,
311
           const char **filename_ptr, const char **fnname_ptr,
312
           unsigned int *retline_ptr));
313
#define _bfd_ecoff_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
314
#define _bfd_ecoff_read_minisymbols _bfd_generic_read_minisymbols
315
#define _bfd_ecoff_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
316
 
317
#define _bfd_ecoff_get_reloc_upper_bound coff_get_reloc_upper_bound
318
extern long _bfd_ecoff_canonicalize_reloc
319
  PARAMS ((bfd *, asection *, arelent **, asymbol **symbols));
320
/* ecoff_bfd_reloc_type_lookup defined by backend. */
321
 
322
extern boolean _bfd_ecoff_set_arch_mach
323
  PARAMS ((bfd *, enum bfd_architecture, unsigned long machine));
324
extern boolean _bfd_ecoff_set_section_contents
325
  PARAMS ((bfd *, asection *, PTR location, file_ptr, bfd_size_type));
326
 
327
extern int _bfd_ecoff_sizeof_headers PARAMS ((bfd *abfd, boolean reloc));
328
/* ecoff_bfd_get_relocated_section_contents defined by backend.  */
329
/* ecoff_bfd_relax_section defined by backend.  */
330
extern struct bfd_link_hash_table *_bfd_ecoff_bfd_link_hash_table_create
331
  PARAMS ((bfd *));
332
extern boolean _bfd_ecoff_bfd_link_add_symbols
333
  PARAMS ((bfd *, struct bfd_link_info *));
334
extern boolean _bfd_ecoff_bfd_final_link
335
  PARAMS ((bfd *, struct bfd_link_info *));
336
 
337
/* Hook functions for the generic COFF section reading code.  */
338
 
339
extern PTR _bfd_ecoff_mkobject_hook PARAMS ((bfd *, PTR filehdr, PTR aouthdr));
340
#define _bfd_ecoff_set_alignment_hook \
341
  ((void (*) PARAMS ((bfd *, asection *, PTR))) bfd_void)
342
extern boolean _bfd_ecoff_set_arch_mach_hook PARAMS ((bfd *abfd, PTR filehdr));
343
extern flagword _bfd_ecoff_styp_to_sec_flags
344
  PARAMS ((bfd *, PTR, const char *, asection *, flagword *));
345
extern boolean _bfd_ecoff_slurp_symbol_table PARAMS ((bfd *abfd));
346
 
347
/* ECOFF auxiliary information swapping routines.  These are the same
348
   for all ECOFF targets, so they are defined in ecofflink.c.  */
349
 
350
extern void _bfd_ecoff_swap_tir_in
351
  PARAMS ((int, const struct tir_ext *, TIR *));
352
extern void _bfd_ecoff_swap_tir_out
353
  PARAMS ((int, const TIR *, struct tir_ext *));
354
extern void _bfd_ecoff_swap_rndx_in
355
  PARAMS ((int, const struct rndx_ext *, RNDXR *));
356
extern void _bfd_ecoff_swap_rndx_out
357
  PARAMS ((int, const RNDXR *, struct rndx_ext *));

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