1 /* BFD ECOFF object file private structure.
2 Copyright (C) 1993 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 2 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
24 #include "coff/ecoff.h"
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. */
32 #define ecoff_backend(abfd) \
33 ((struct ecoff_backend_data *) (abfd)->xvec->backend_data)
35 struct ecoff_backend_data
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. */
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
49 boolean rdata_in_text;
50 /* Bitsize of constructor entries. */
51 unsigned int constructor_bitsize;
52 /* Reloc to use for constructor entries. */
53 CONST struct reloc_howto_struct *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 *,
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,
70 PTR external_relocs));
73 /* This is the target specific information kept for ECOFF files. */
75 #define ecoff_data(abfd) ((abfd)->tdata.ecoff_obj_data)
77 typedef struct ecoff_tdata
79 /* The reloc file position, set by
80 ecoff_compute_section_file_positions. */
81 file_ptr reloc_filepos;
83 /* The symbol table file position, set by ecoff_mkobject_hook. */
86 /* The start and end of the text segment. Only valid for an
87 existing file, not for one we are creating. */
88 unsigned long text_start;
89 unsigned long text_end;
91 /* The cached gp value. This is used when relocating. */
94 /* The maximum size of objects to optimize using gp. This is
95 typically set by the -G option to the compiler, assembler or
99 /* The register masks. When linking, all the masks found in the
100 input files are combined into the masks of the output file.
101 These are not all used for all targets, but that's OK, because
102 the relevant ones are the only ones swapped in and out. */
103 unsigned long gprmask;
104 unsigned long fprmask;
105 unsigned long cprmask[4];
107 /* The ECOFF symbolic debugging information. */
108 struct ecoff_debug_info debug_info;
110 /* The unswapped ECOFF symbolic information. */
113 /* The canonical BFD symbols. */
114 struct ecoff_symbol_struct *canonical_symbols;
116 /* A mapping from external symbol numbers to entries in the linker
117 hash table, used when linking. */
118 struct ecoff_link_hash_entry **sym_hashes;
120 /* A mapping from reloc symbol indices to sections, used when
122 asection **symndx_to_section;
124 /* True if this BFD was written by the backend linker. */
129 /* Each canonical asymbol really looks like this. */
131 typedef struct ecoff_symbol_struct
133 /* The actual symbol which the rest of BFD works with */
136 /* The fdr for this symbol. */
139 /* true if this is a local symbol rather than an external one. */
142 /* A pointer to the unswapped hidden information for this symbol.
143 This is either a struct sym_ext or a struct ext_ext, depending on
144 the value of the local field above. */
148 /* We take the address of the first element of a asymbol to ensure that the
149 macro is only ever applied to an asymbol. */
150 #define ecoffsymbol(asymbol) ((ecoff_symbol_type *) (&((asymbol)->the_bfd)))
152 /* This is a hack borrowed from coffcode.h; we need to save the index
153 of an external symbol when we write it out so that can set the
154 symbol index correctly when we write out the relocs. */
155 #define ecoff_get_sym_index(symbol) ((unsigned long) (symbol)->udata)
156 #define ecoff_set_sym_index(symbol, idx) ((symbol)->udata = (PTR) (idx))
158 /* When generating MIPS embedded PIC code, the linker relaxes the code
159 to turn PC relative branches into longer code sequences when the PC
160 relative branch is out of range. This involves reading the relocs
161 in bfd_relax_section as well as in bfd_final_link, and requires the
162 code to keep track of which relocs have been expanded. A pointer
163 to this structure is put in the used_by_bfd pointer of a section to
164 keep track of this information. The user_by_bfd pointer will be
165 NULL if the information was not needed. */
167 struct ecoff_section_tdata
169 /* The unswapped relocs for this section. These are stored in
170 memory so the input file does not have to be read twice. */
173 /* The contents of the section. These bytes may or may not be saved
174 in memory, but if it is this is a pointer to them. */
177 /* Offset adjustments for PC relative branches. A number other than
178 1 is an addend for a PC relative branch, or a switch table entry
179 which is the difference of two .text locations; this addend
180 arises because the branch or difference crosses one or more
181 branches which were expanded into a larger code sequence. A 1
182 means that this branch was itself expanded into a larger code
183 sequence. 1 is not a possible offset, since all offsets must be
184 multiples of the instruction size, which is 4; also, the only
185 relocs with non-zero offsets will be PC relative branches or
186 switch table entries within the same object file. If this field
187 is NULL, no branches were expanded and no offsets are required.
188 Otherwise there are as many entries as there are relocs in the
189 section, and the entry for any reloc that is not PC relative is
194 /* An accessor macro for the ecoff_section_tdata structure. */
195 #define ecoff_section_data(abfd, sec) \
196 ((struct ecoff_section_tdata *) (sec)->used_by_bfd)
198 /* ECOFF linker hash table entries. */
200 struct ecoff_link_hash_entry
202 struct bfd_link_hash_entry root;
203 /* Symbol index in output file. */
205 /* BFD that ext field value came from. */
207 /* ECOFF external symbol information. */
209 /* Nonzero if this symbol has been written out. */
211 /* Nonzero if this symbol was referred to as small undefined. */
215 /* ECOFF linker hash table. */
217 struct ecoff_link_hash_table
219 struct bfd_link_hash_table root;
222 /* Make an ECOFF object. */
223 extern boolean ecoff_mkobject PARAMS ((bfd *));
225 /* Read in the ECOFF symbolic debugging information. */
226 extern boolean ecoff_slurp_symbolic_info PARAMS ((bfd *));
228 /* Generic ECOFF BFD backend vectors. */
230 extern boolean ecoff_write_object_contents PARAMS ((bfd *abfd));
231 extern bfd_target *ecoff_archive_p PARAMS ((bfd *abfd));
233 #define ecoff_close_and_cleanup _bfd_generic_close_and_cleanup
234 #define ecoff_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
235 extern boolean ecoff_new_section_hook PARAMS ((bfd *abfd,
237 extern boolean ecoff_get_section_contents PARAMS ((bfd *abfd,
241 bfd_size_type count));
243 extern boolean ecoff_bfd_copy_private_bfd_data PARAMS ((bfd *, bfd *));
244 #define ecoff_bfd_copy_private_section_data \
245 _bfd_generic_bfd_copy_private_section_data
247 extern boolean ecoff_slurp_armap PARAMS ((bfd *abfd));
248 #define ecoff_slurp_extended_name_table _bfd_slurp_extended_name_table
249 #define ecoff_truncate_arname bfd_dont_truncate_arname
250 extern boolean ecoff_write_armap PARAMS ((bfd *abfd, unsigned int elength,
252 unsigned int orl_count,
254 #define ecoff_openr_next_archived_file bfd_generic_openr_next_archived_file
255 #define ecoff_generic_stat_arch_elt bfd_generic_stat_arch_elt
257 extern long ecoff_get_symtab_upper_bound PARAMS ((bfd *abfd));
258 extern long ecoff_get_symtab PARAMS ((bfd *abfd, asymbol **alocation));
259 extern asymbol *ecoff_make_empty_symbol PARAMS ((bfd *abfd));
260 extern void ecoff_print_symbol PARAMS ((bfd *abfd, PTR filep,
262 bfd_print_symbol_type how));
263 extern void ecoff_get_symbol_info PARAMS ((bfd *abfd,
266 #define ecoff_bfd_is_local_label bfd_generic_is_local_label
267 #define ecoff_get_lineno _bfd_nosymbols_get_lineno
268 extern boolean ecoff_find_nearest_line PARAMS ((bfd *abfd,
272 CONST char **filename_ptr,
273 CONST char **fnname_ptr,
274 unsigned int *retline_ptr));
275 #define ecoff_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
277 #define ecoff_get_reloc_upper_bound coff_get_reloc_upper_bound
278 extern long ecoff_canonicalize_reloc PARAMS ((bfd *abfd,
282 /* ecoff_bfd_reloc_type_lookup defined by backend. */
284 extern boolean ecoff_set_arch_mach PARAMS ((bfd *abfd,
285 enum bfd_architecture arch,
286 unsigned long machine));
287 extern boolean ecoff_set_section_contents PARAMS ((bfd *abfd,
291 bfd_size_type count));
293 extern int ecoff_sizeof_headers PARAMS ((bfd *abfd, boolean reloc));
294 /* ecoff_bfd_get_relocated_section_contents defined by backend. */
295 /* ecoff_bfd_relax_section defined by backend. */
296 extern struct bfd_link_hash_table *ecoff_bfd_link_hash_table_create
298 extern boolean ecoff_bfd_link_add_symbols
299 PARAMS ((bfd *, struct bfd_link_info *));
300 extern boolean ecoff_bfd_final_link PARAMS ((bfd *, struct bfd_link_info *));
302 /* Hook functions for the generic COFF section reading code. */
304 extern PTR ecoff_mkobject_hook PARAMS ((bfd *, PTR filehdr, PTR aouthdr));
305 extern asection *ecoff_make_section_hook PARAMS ((bfd *abfd, char *name));
306 #define ecoff_set_alignment_hook \
307 ((void (*) PARAMS ((bfd *, asection *, PTR))) bfd_void)
308 extern boolean ecoff_set_arch_mach_hook PARAMS ((bfd *abfd, PTR filehdr));
309 extern long ecoff_sec_to_styp_flags PARAMS ((CONST char *name,
311 extern flagword ecoff_styp_to_sec_flags PARAMS ((bfd *abfd, PTR hdr));
312 extern boolean ecoff_slurp_symbol_table PARAMS ((bfd *abfd));