1 /* BFD ECOFF object file private structure.
2 Copyright (C) 1993-2014 Free Software Foundation, Inc.
3 Written by Ian Lance Taylor, Cygnus Support.
5 This file is part of BFD, the Binary File Descriptor library.
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.
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.
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. */
25 #include "coff/ecoff.h"
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. */
33 #define ecoff_backend(abfd) \
34 ((struct ecoff_backend_data *) (abfd)->xvec->backend_data)
36 struct ecoff_backend_data
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. */
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
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);
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
83 /* This is the target specific information kept for ECOFF files. */
85 #define ecoff_data(abfd) ((abfd)->tdata.ecoff_obj_data)
87 typedef struct ecoff_tdata
89 /* The reloc file position, set by
90 ecoff_compute_section_file_positions. */
91 file_ptr reloc_filepos;
93 /* The symbol table file position, set by _bfd_ecoff_mkobject_hook. */
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;
101 /* The cached gp value. This is used when relocating. */
104 /* The maximum size of objects to optimize using gp. This is
105 typically set by the -G option to the compiler, assembler or
107 unsigned int gp_size;
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];
117 /* The ECOFF symbolic debugging information. */
118 struct ecoff_debug_info debug_info;
120 /* The unswapped ECOFF symbolic information. */
123 /* The canonical BFD symbols. */
124 struct ecoff_symbol_struct *canonical_symbols;
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;
130 /* A mapping from reloc symbol indices to sections, used when
132 asection **symndx_to_section;
134 /* TRUE if this BFD was written by the backend linker. */
137 /* TRUE if a warning that multiple global pointer values are
138 needed in the output binary was issued already. */
139 bfd_boolean issued_multiple_gp_warning;
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;
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 bfd_boolean rdata_in_text;
153 /* Each canonical asymbol really looks like this. */
155 typedef struct ecoff_symbol_struct
157 /* The actual symbol which the rest of BFD works with */
160 /* The fdr for this symbol. */
163 /* TRUE if this is a local symbol rather than an external one. */
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. */
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)))
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
179 #define ecoff_get_sym_index(symbol) ((symbol)->udata.i)
180 #define ecoff_set_sym_index(symbol, idx) ((symbol)->udata.i = (idx))
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
187 struct ecoff_section_tdata
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 . */
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)
202 /* ECOFF linker hash table entries. */
204 struct ecoff_link_hash_entry
206 struct bfd_link_hash_entry root;
207 /* Symbol index in output file. */
209 /* BFD that ext field value came from. */
211 /* ECOFF external symbol information. */
213 /* Nonzero if this symbol has been written out. */
215 /* Nonzero if this symbol was referred to as small undefined. */
219 /* ECOFF linker hash table. */
221 struct ecoff_link_hash_table
223 struct bfd_link_hash_table root;
226 /* Make an ECOFF object. */
227 extern bfd_boolean _bfd_ecoff_mkobject (bfd *);
229 /* Read in the ECOFF symbolic debugging information. */
230 extern bfd_boolean _bfd_ecoff_slurp_symbolic_info
231 (bfd *, asection *, struct ecoff_debug_info *);
233 /* Generic ECOFF BFD backend vectors. */
235 extern bfd_boolean _bfd_ecoff_write_object_contents (bfd *);
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 bfd_boolean _bfd_ecoff_new_section_hook
241 extern bfd_boolean _bfd_ecoff_get_section_contents
242 (bfd *, asection *, void * location, file_ptr, bfd_size_type);
244 #define _bfd_ecoff_bfd_link_split_section _bfd_generic_link_split_section
246 extern bfd_boolean _bfd_ecoff_bfd_copy_private_bfd_data
248 #define _bfd_ecoff_bfd_copy_private_section_data \
249 _bfd_generic_bfd_copy_private_section_data
251 #define _bfd_ecoff_bfd_copy_private_symbol_data \
252 _bfd_generic_bfd_copy_private_symbol_data
254 #define _bfd_ecoff_bfd_copy_private_header_data \
255 _bfd_generic_bfd_copy_private_header_data
257 #define _bfd_ecoff_bfd_print_private_bfd_data \
258 _bfd_generic_bfd_print_private_bfd_data
260 #define _bfd_ecoff_bfd_merge_private_bfd_data \
261 _bfd_generic_bfd_merge_private_bfd_data
263 #define _bfd_ecoff_bfd_set_private_flags _bfd_generic_bfd_set_private_flags
264 extern bfd_boolean _bfd_ecoff_slurp_armap (bfd *);
265 #define _bfd_ecoff_slurp_extended_name_table _bfd_slurp_extended_name_table
266 #define _bfd_ecoff_construct_extended_name_table \
267 _bfd_archive_bsd_construct_extended_name_table
268 #define _bfd_ecoff_truncate_arname bfd_dont_truncate_arname
269 extern bfd_boolean _bfd_ecoff_write_armap
270 (bfd *, unsigned int, struct orl *, unsigned int, int);
271 #define _bfd_ecoff_read_ar_hdr _bfd_generic_read_ar_hdr
272 #define _bfd_ecoff_write_ar_hdr _bfd_generic_write_ar_hdr
273 #define _bfd_ecoff_openr_next_archived_file \
274 bfd_generic_openr_next_archived_file
275 #define _bfd_ecoff_get_elt_at_index _bfd_generic_get_elt_at_index
276 #define _bfd_ecoff_generic_stat_arch_elt bfd_generic_stat_arch_elt
277 #define _bfd_ecoff_update_armap_timestamp bfd_true
278 #define _bfd_ecoff_bfd_is_target_special_symbol \
279 ((bfd_boolean (*) (bfd *, asymbol *)) bfd_false)
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 extern bfd_boolean _bfd_ecoff_bfd_is_local_label_name
289 (bfd *, const char *);
290 #define _bfd_ecoff_get_lineno _bfd_nosymbols_get_lineno
291 extern bfd_boolean _bfd_ecoff_find_nearest_line
292 (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **,
294 #define _bfd_ecoff_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
295 #define _bfd_ecoff_read_minisymbols _bfd_generic_read_minisymbols
296 #define _bfd_ecoff_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
297 #define _bfd_ecoff_find_inliner_info _bfd_nosymbols_find_inliner_info
299 #define _bfd_ecoff_get_reloc_upper_bound coff_get_reloc_upper_bound
300 extern long _bfd_ecoff_canonicalize_reloc
301 (bfd *, asection *, arelent **, asymbol **symbols);
302 /* ecoff_bfd_reloc_type_lookup defined by backend. */
304 extern bfd_boolean _bfd_ecoff_set_arch_mach
305 (bfd *, enum bfd_architecture, unsigned long);
306 extern bfd_boolean _bfd_ecoff_set_section_contents
307 (bfd *, asection *, const void * location, file_ptr, bfd_size_type);
309 extern int _bfd_ecoff_sizeof_headers (bfd *, struct bfd_link_info *);
310 /* ecoff_bfd_get_relocated_section_contents defined by backend. */
311 /* ecoff_bfd_relax_section defined by backend. */
312 extern struct bfd_link_hash_table *_bfd_ecoff_bfd_link_hash_table_create
314 extern bfd_boolean _bfd_ecoff_bfd_link_add_symbols
315 (bfd *, struct bfd_link_info *);
316 #define _bfd_ecoff_bfd_link_just_syms _bfd_generic_link_just_syms
317 #define _bfd_ecoff_bfd_copy_link_hash_symbol_type \
318 _bfd_generic_copy_link_hash_symbol_type
319 extern bfd_boolean _bfd_ecoff_bfd_final_link
320 (bfd *, struct bfd_link_info *);
322 /* Hook functions for the generic COFF section reading code. */
324 extern void * _bfd_ecoff_mkobject_hook (bfd *, void *, void *);
325 #define _bfd_ecoff_set_alignment_hook \
326 ((void (*) (bfd *, asection *, void *)) bfd_void)
327 extern bfd_boolean _bfd_ecoff_set_arch_mach_hook
329 extern bfd_boolean _bfd_ecoff_no_long_sections
330 (bfd *abfd, int enable);
331 extern bfd_boolean _bfd_ecoff_styp_to_sec_flags
332 (bfd *, void *, const char *, asection *, flagword *);
333 extern bfd_boolean _bfd_ecoff_slurp_symbol_table (bfd *);
335 /* ECOFF auxiliary information swapping routines. These are the same
336 for all ECOFF targets, so they are defined in ecofflink.c. */
338 extern void _bfd_ecoff_swap_tir_in
339 (int, const struct tir_ext *, TIR *);
340 extern void _bfd_ecoff_swap_tir_out
341 (int, const TIR *, struct tir_ext *);
342 extern void _bfd_ecoff_swap_rndx_in
343 (int, const struct rndx_ext *, RNDXR *);
344 extern void _bfd_ecoff_swap_rndx_out
345 (int, const RNDXR *, struct rndx_ext *);