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
;
126 /* Each canonical asymbol really looks like this. */
128 typedef struct ecoff_symbol_struct
130 /* The actual symbol which the rest of BFD works with */
133 /* The fdr for this symbol. */
136 /* true if this is a local symbol rather than an external one. */
139 /* A pointer to the unswapped hidden information for this symbol.
140 This is either a struct sym_ext or a struct ext_ext, depending on
141 the value of the local field above. */
145 /* We take the address of the first element of a asymbol to ensure that the
146 macro is only ever applied to an asymbol. */
147 #define ecoffsymbol(asymbol) ((ecoff_symbol_type *) (&((asymbol)->the_bfd)))
149 /* This is a hack borrowed from coffcode.h; we need to save the index
150 of an external symbol when we write it out so that can set the
151 symbol index correctly when we write out the relocs. */
152 #define ecoff_get_sym_index(symbol) ((unsigned long) (symbol)->udata)
153 #define ecoff_set_sym_index(symbol, idx) ((symbol)->udata = (PTR) (idx))
155 /* When generating MIPS embedded PIC code, the linker relaxes the code
156 to turn PC relative branches into longer code sequences when the PC
157 relative branch is out of range. This involves reading the relocs
158 in bfd_relax_section as well as in bfd_final_link, and requires the
159 code to keep track of which relocs have been expanded. A pointer
160 to this structure is put in the used_by_bfd pointer of a section to
161 keep track of this information. The user_by_bfd pointer will be
162 NULL if the information was not needed. */
164 struct ecoff_section_tdata
166 /* The unswapped relocs for this section. These are stored in
167 memory so the input file does not have to be read twice. */
170 /* The contents of the section. These bytes may or may not be saved
171 in memory, but if it is this is a pointer to them. */
174 /* Offset adjustments for PC relative branches. A number other than
175 1 is an addend for a PC relative branch; this addend arises because
176 it crosses one or more branches which were expanded into a larger
177 code sequence. A 1 means that this branch was itself expanded into
178 a larger code sequence. 1 is not a possible offset, since all
179 offsets must be multiples of the instruction size, which is 4;
180 also, the only relocs with non-zero offsets will be PC relative
181 branches within the same object file. If this field is NULL, no
182 branches were expanded and no offsets are required. Otherwise
183 there are as many entries as there are relocs in the section, and
184 the entry for any reloc that is not PC relative is zero. */
188 /* An accessor macro for the ecoff_section_tdata structure. */
189 #define ecoff_section_data(abfd, sec) \
190 ((struct ecoff_section_tdata *) (sec)->used_by_bfd)
192 /* ECOFF linker hash table entries. */
194 struct ecoff_link_hash_entry
196 struct bfd_link_hash_entry root
;
197 /* Symbol index in output file. */
199 /* BFD that ext field value came from. */
201 /* ECOFF external symbol information. */
205 /* ECOFF linker hash table. */
207 struct ecoff_link_hash_table
209 struct bfd_link_hash_table root
;
212 /* Make an ECOFF object. */
213 extern boolean ecoff_mkobject
PARAMS ((bfd
*));
215 /* Read in the ECOFF symbolic debugging information. */
216 extern boolean ecoff_slurp_symbolic_info
PARAMS ((bfd
*));
218 /* Generic ECOFF BFD backend vectors. */
219 extern asymbol
*ecoff_make_empty_symbol
PARAMS ((bfd
*abfd
));
220 extern long ecoff_get_symtab_upper_bound
PARAMS ((bfd
*abfd
));
221 extern long ecoff_get_symtab
PARAMS ((bfd
*abfd
, asymbol
**alocation
));
222 extern void ecoff_get_symbol_info
PARAMS ((bfd
*abfd
,
225 extern void ecoff_print_symbol
PARAMS ((bfd
*abfd
, PTR filep
,
227 bfd_print_symbol_type how
));
228 extern long ecoff_canonicalize_reloc
PARAMS ((bfd
*abfd
,
232 extern boolean ecoff_find_nearest_line
PARAMS ((bfd
*abfd
,
236 CONST
char **filename_ptr
,
237 CONST
char **fnname_ptr
,
238 unsigned int *retline_ptr
));
239 extern boolean ecoff_set_arch_mach
PARAMS ((bfd
*abfd
,
240 enum bfd_architecture arch
,
241 unsigned long machine
));
242 extern int ecoff_sizeof_headers
PARAMS ((bfd
*abfd
, boolean reloc
));
243 extern boolean ecoff_set_section_contents
PARAMS ((bfd
*abfd
,
247 bfd_size_type count
));
248 extern boolean ecoff_get_section_contents
PARAMS ((bfd
*abfd
,
252 bfd_size_type count
));
253 extern boolean ecoff_write_object_contents
PARAMS ((bfd
*abfd
));
254 extern boolean ecoff_slurp_armap
PARAMS ((bfd
*abfd
));
255 extern boolean ecoff_write_armap
PARAMS ((bfd
*abfd
, unsigned int elength
,
257 unsigned int orl_count
,
259 #define ecoff_slurp_extended_name_table _bfd_slurp_extended_name_table
260 extern bfd_target
*ecoff_archive_p
PARAMS ((bfd
*abfd
));
261 #define ecoff_get_lineno \
262 ((alent *(*) PARAMS ((bfd *, asymbol *))) bfd_nullvoidptr)
263 #define ecoff_truncate_arname bfd_dont_truncate_arname
264 #define ecoff_openr_next_archived_file bfd_generic_openr_next_archived_file
265 #define ecoff_generic_stat_arch_elt bfd_generic_stat_arch_elt
266 #define ecoff_get_reloc_upper_bound coff_get_reloc_upper_bound
267 #define ecoff_close_and_cleanup bfd_generic_close_and_cleanup
268 #define ecoff_bfd_debug_info_start bfd_void
269 #define ecoff_bfd_debug_info_end bfd_void
270 #define ecoff_bfd_debug_info_accumulate \
271 ((void (*) PARAMS ((bfd *, struct sec *))) bfd_void)
272 #define ecoff_bfd_make_debug_symbol \
273 ((asymbol *(*) PARAMS ((bfd *, void *, unsigned long))) bfd_nullvoidptr)
274 extern struct bfd_link_hash_table
*ecoff_bfd_link_hash_table_create
276 extern boolean ecoff_bfd_link_add_symbols
277 PARAMS ((bfd
*, struct bfd_link_info
*));
278 extern boolean ecoff_bfd_final_link
PARAMS ((bfd
*, struct bfd_link_info
*));
280 #ifndef ecoff_bfd_copy_private_section_data
281 #define ecoff_bfd_copy_private_section_data \
282 ((boolean (*) PARAMS ((bfd *, asection *, bfd *, asection *))) bfd_true)
284 #ifndef ecoff_bfd_copy_private_bfd_data
285 #define ecoff_bfd_copy_private_bfd_data \
286 ((boolean (*) PARAMS ((bfd *, bfd *))) bfd_true)
288 #ifndef ecoff_bfd_is_local_label
289 #define ecoff_bfd_is_local_label bfd_generic_is_local_label
292 /* Hook functions for the generic COFF section reading code. */
293 extern PTR ecoff_mkobject_hook
PARAMS ((bfd
*, PTR filehdr
, PTR aouthdr
));
294 extern asection
*ecoff_make_section_hook
PARAMS ((bfd
*abfd
, char *name
));
295 extern boolean ecoff_new_section_hook
PARAMS ((bfd
*abfd
,
297 #define ecoff_set_alignment_hook \
298 ((void (*) PARAMS ((bfd *, asection *, PTR))) bfd_void)
299 extern boolean ecoff_set_arch_mach_hook
PARAMS ((bfd
*abfd
, PTR filehdr
));
300 extern long ecoff_sec_to_styp_flags
PARAMS ((CONST
char *name
,
302 extern flagword ecoff_styp_to_sec_flags
PARAMS ((bfd
*abfd
, PTR hdr
));
303 extern boolean ecoff_slurp_symbol_table
PARAMS ((bfd
*abfd
));