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6724ff46 RP |
1 | /* Object file "section" support for the BFD library. |
2 | Copyright (C) 1990-1991 Free Software Foundation, Inc. | |
3 | Written by 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
20 | ||
4a96bc04 SC |
21 | /* |
22 | SECTION | |
23 | Sections | |
985fca12 | 24 | |
4a96bc04 SC |
25 | Sections are supported in BFD in <<section.c>>. |
26 | ||
27 | The raw data contained within a BFD is maintained through the | |
28 | section abstraction. A single BFD may have any number of | |
29 | sections, and keeps hold of them by pointing to the first, | |
30 | each one points to the next in the list. | |
985fca12 SC |
31 | |
32 | @menu | |
151760d0 RP |
33 | @* Section Input:: |
34 | @* Section Output:: | |
35 | @* typedef asection:: | |
36 | @* section prototypes:: | |
985fca12 SC |
37 | @end menu |
38 | ||
fefb4b30 JG |
39 | INODE |
40 | Section Input, Section Output, Sections, Sections | |
4a96bc04 SC |
41 | SUBSECTION |
42 | Section Input | |
43 | ||
44 | When a BFD is opened for reading, the section structures are | |
45 | created and attached to the BFD. | |
46 | ||
47 | Each section has a name which describes the section in the | |
48 | outside world - for example, <<a.out>> would contain at least | |
49 | three sections, called <<.text>>, <<.data>> and <<.bss>>. | |
50 | ||
51 | Sometimes a BFD will contain more than the 'natural' number of | |
52 | sections. A back end may attach other sections containing | |
53 | constructor data, or an application may add a section (using | |
54 | bfd_make_section) to the sections attached to an already open | |
55 | BFD. For example, the linker creates a supernumary section | |
56 | <<COMMON>> for each input file's BFD to hold information about | |
57 | common storage. | |
58 | ||
59 | The raw data is not necessarily read in at the same time as | |
60 | the section descriptor is created. Some targets may leave the | |
61 | data in place until a <<bfd_get_section_contents>> call is | |
62 | made. Other back ends may read in all the data at once - For | |
63 | example; an S-record file has to be read once to determine the | |
64 | size of the data. An IEEE-695 file doesn't contain raw data in | |
65 | sections, but data and relocation expressions intermixed, so | |
66 | the data area has to be parsed to get out the data and | |
67 | relocations. | |
68 | ||
fefb4b30 JG |
69 | INODE |
70 | Section Output, typedef asection, Section Input, Sections | |
4a96bc04 SC |
71 | |
72 | SUBSECTION | |
73 | Section Output | |
74 | ||
75 | To write a new object style BFD, the various sections to be | |
76 | written have to be created. They are attached to the BFD in | |
77 | the same way as input sections, data is written to the | |
78 | sections using <<bfd_set_section_contents>>. | |
79 | ||
fefb4b30 JG |
80 | Any program that creates or combines sections (e.g., the assembler |
81 | and linker) must use the fields <<output_section>> and | |
82 | <<output_offset>> to indicate the file sections to which each | |
83 | section must be written. (If the section is being created from | |
84 | scratch, <<output_section>> should probably point to the section | |
85 | itself, and <<output_offset>> should probably be zero.) | |
4a96bc04 SC |
86 | |
87 | The data to be written comes from input sections attached to | |
88 | the output sections. The output section structure can be | |
89 | considered a filter for the input section, the output section | |
90 | determines the vma of the output data and the name, but the | |
91 | input section determines the offset into the output section of | |
92 | the data to be written. | |
93 | ||
fefb4b30 | 94 | E.g., to create a section "O", starting at 0x100, 0x123 long, |
4a96bc04 SC |
95 | containing two subsections, "A" at offset 0x0 (ie at vma |
96 | 0x100) and "B" at offset 0x20 (ie at vma 0x120) the structures | |
97 | would look like: | |
98 | ||
99 | | section name "A" | |
100 | | output_offset 0x00 | |
101 | | size 0x20 | |
102 | | output_section -----------> section name "O" | |
103 | | | vma 0x100 | |
104 | | section name "B" | size 0x123 | |
105 | | output_offset 0x20 | | |
106 | | size 0x103 | | |
107 | | output_section --------| | |
108 | ||
985fca12 | 109 | |
e98e6ec1 SC |
110 | SUBSECTION |
111 | Seglets | |
112 | ||
113 | The data within a section is stored in a <<seglet>>. These | |
114 | are much like the fixups in <<gas>>. The seglet abstraction | |
115 | allows the a section to grow and shrink within itself. | |
116 | ||
117 | A seglet knows how big it is, and which is the next seglet and | |
118 | where the raw data for it is, and also points to a list of | |
119 | relocations which apply to it. | |
120 | ||
121 | The seglet is used by the linker to perform relaxing on final | |
122 | code. The application creates code which is as big as | |
123 | necessary to make it work without relaxing, and the user can | |
124 | select whether to relax. Sometimes relaxing takes a lot of | |
125 | time. The linker runs around the relocations to see if any | |
126 | are attached to data which can be shrunk, if so it does it on | |
127 | a seglet by seglet basis. | |
128 | ||
985fca12 SC |
129 | */ |
130 | ||
131 | ||
985fca12 | 132 | #include "bfd.h" |
cbdc7909 | 133 | #include "sysdep.h" |
985fca12 SC |
134 | #include "libbfd.h" |
135 | ||
4a96bc04 | 136 | |
fefb4b30 JG |
137 | /* |
138 | DOCDD | |
139 | INODE | |
140 | typedef asection, section prototypes, Section Output, Sections | |
4a96bc04 SC |
141 | SUBSECTION |
142 | typedef asection | |
143 | ||
144 | The shape of a section struct: | |
145 | ||
146 | CODE_FRAGMENT | |
147 | . | |
148 | .typedef struct sec | |
149 | .{ | |
150 | . {* The name of the section, the name isn't a copy, the pointer is | |
151 | . the same as that passed to bfd_make_section. *} | |
152 | . | |
153 | . CONST char *name; | |
154 | . | |
e98e6ec1 SC |
155 | . |
156 | . {* Which section is it 0.nth *} | |
157 | . | |
158 | . int index; | |
159 | . | |
4a96bc04 SC |
160 | . {* The next section in the list belonging to the BFD, or NULL. *} |
161 | . | |
162 | . struct sec *next; | |
163 | . | |
164 | . {* The field flags contains attributes of the section. Some of | |
165 | . flags are read in from the object file, and some are | |
166 | . synthesized from other information. *} | |
167 | . | |
168 | . flagword flags; | |
169 | . | |
170 | .#define SEC_NO_FLAGS 0x000 | |
171 | . | |
172 | . {* Tells the OS to allocate space for this section when loaded. | |
173 | . This would clear for a section containing debug information | |
174 | . only. *} | |
175 | . | |
176 | . | |
177 | .#define SEC_ALLOC 0x001 | |
178 | . {* Tells the OS to load the section from the file when loading. | |
179 | . This would be clear for a .bss section *} | |
180 | . | |
181 | .#define SEC_LOAD 0x002 | |
182 | . {* The section contains data still to be relocated, so there will | |
183 | . be some relocation information too. *} | |
184 | . | |
185 | .#define SEC_RELOC 0x004 | |
186 | . | |
187 | . {* Obsolete ? *} | |
188 | . | |
189 | .#define SEC_BALIGN 0x008 | |
190 | . | |
191 | . {* A signal to the OS that the section contains read only | |
192 | . data. *} | |
193 | .#define SEC_READONLY 0x010 | |
194 | . | |
195 | . {* The section contains code only. *} | |
196 | . | |
197 | .#define SEC_CODE 0x020 | |
198 | . | |
199 | . {* The section contains data only. *} | |
200 | . | |
201 | .#define SEC_DATA 0x040 | |
202 | . | |
203 | . {* The section will reside in ROM. *} | |
204 | . | |
205 | .#define SEC_ROM 0x080 | |
206 | . | |
207 | . {* The section contains constructor information. This section | |
208 | . type is used by the linker to create lists of constructors and | |
209 | . destructors used by <<g++>>. When a back end sees a symbol | |
210 | . which should be used in a constructor list, it creates a new | |
211 | . section for the type of name (eg <<__CTOR_LIST__>>), attaches | |
212 | . the symbol to it and builds a relocation. To build the lists | |
213 | . of constructors, all the linker has to to is catenate all the | |
214 | . sections called <<__CTOR_LIST__>> and relocte the data | |
215 | . contained within - exactly the operations it would peform on | |
216 | . standard data. *} | |
217 | . | |
218 | .#define SEC_CONSTRUCTOR 0x100 | |
219 | . | |
220 | . {* The section is a constuctor, and should be placed at the | |
221 | . end of the . *} | |
222 | . | |
223 | . | |
224 | .#define SEC_CONSTRUCTOR_TEXT 0x1100 | |
225 | . | |
226 | .#define SEC_CONSTRUCTOR_DATA 0x2100 | |
227 | . | |
228 | .#define SEC_CONSTRUCTOR_BSS 0x3100 | |
229 | . | |
230 | . | |
231 | . {* The section has contents - a bss section could be | |
232 | . <<SEC_ALLOC>> | <<SEC_HAS_CONTENTS>>, a debug section could be | |
233 | . <<SEC_HAS_CONTENTS>> *} | |
234 | . | |
235 | .#define SEC_HAS_CONTENTS 0x200 | |
236 | . | |
237 | . {* An instruction to the linker not to output sections | |
238 | . containing this flag even if they have information which | |
239 | . would normally be written. *} | |
240 | . | |
241 | .#define SEC_NEVER_LOAD 0x400 | |
242 | . | |
e98e6ec1 | 243 | . |
4a96bc04 SC |
244 | . |
245 | . bfd_vma vma; | |
fefb4b30 | 246 | . boolean user_set_vma; |
4a96bc04 | 247 | . |
e98e6ec1 | 248 | . {* The size of the section in bytes, as it will be output. |
4a96bc04 | 249 | . contains a value even if the section has no contents (eg, the |
e98e6ec1 SC |
250 | . size of <<.bss>>). This will be filled in after relocation *} |
251 | . | |
252 | . bfd_size_type _cooked_size; | |
253 | . | |
254 | . {* The size on disk of the section in bytes originally. Normally this | |
255 | . value is the same as the size, but if some relaxing has | |
256 | . been done, then this value will be bigger. *} | |
4a96bc04 | 257 | . |
e98e6ec1 | 258 | . bfd_size_type _raw_size; |
4a96bc04 SC |
259 | . |
260 | . {* If this section is going to be output, then this value is the | |
261 | . offset into the output section of the first byte in the input | |
262 | . section. Eg, if this was going to start at the 100th byte in | |
263 | . the output section, this value would be 100. *} | |
264 | . | |
265 | . bfd_vma output_offset; | |
266 | . | |
267 | . {* The output section through which to map on output. *} | |
268 | . | |
269 | . struct sec *output_section; | |
270 | . | |
271 | . {* The alignment requirement of the section, as an exponent - eg | |
272 | . 3 aligns to 2^3 (or 8) *} | |
273 | . | |
274 | . unsigned int alignment_power; | |
275 | . | |
276 | . {* If an input section, a pointer to a vector of relocation | |
277 | . records for the data in this section. *} | |
278 | . | |
279 | . struct reloc_cache_entry *relocation; | |
280 | . | |
281 | . {* If an output section, a pointer to a vector of pointers to | |
282 | . relocation records for the data in this section. *} | |
283 | . | |
284 | . struct reloc_cache_entry **orelocation; | |
285 | . | |
286 | . {* The number of relocation records in one of the above *} | |
287 | . | |
288 | . unsigned reloc_count; | |
289 | . | |
4a96bc04 SC |
290 | . {* Information below is back end specific - and not always used |
291 | . or updated | |
292 | . | |
293 | . File position of section data *} | |
294 | . | |
295 | . file_ptr filepos; | |
296 | . | |
297 | . {* File position of relocation info *} | |
298 | . | |
299 | . file_ptr rel_filepos; | |
300 | . | |
301 | . {* File position of line data *} | |
302 | . | |
303 | . file_ptr line_filepos; | |
304 | . | |
305 | . {* Pointer to data for applications *} | |
306 | . | |
307 | . PTR userdata; | |
308 | . | |
309 | . struct lang_output_section *otheruserdata; | |
310 | . | |
311 | . {* Attached line number information *} | |
312 | . | |
313 | . alent *lineno; | |
314 | . | |
315 | . {* Number of line number records *} | |
316 | . | |
317 | . unsigned int lineno_count; | |
318 | . | |
319 | . {* When a section is being output, this value changes as more | |
320 | . linenumbers are written out *} | |
321 | . | |
322 | . file_ptr moving_line_filepos; | |
323 | . | |
324 | . {* what the section number is in the target world *} | |
325 | . | |
e98e6ec1 | 326 | . int target_index; |
4a96bc04 SC |
327 | . |
328 | . PTR used_by_bfd; | |
329 | . | |
330 | . {* If this is a constructor section then here is a list of the | |
331 | . relocations created to relocate items within it. *} | |
332 | . | |
333 | . struct relent_chain *constructor_chain; | |
334 | . | |
335 | . {* The BFD which owns the section. *} | |
336 | . | |
337 | . bfd *owner; | |
338 | . | |
e98e6ec1 SC |
339 | . boolean reloc_done; |
340 | . {* A symbol which points at this section only *} | |
341 | . struct symbol_cache_entry *symbol; | |
342 | . struct symbol_cache_entry **symbol_ptr_ptr; | |
990e7c22 JG |
343 | . struct bfd_seclet *seclets_head; |
344 | . struct bfd_seclet *seclets_tail; | |
4a96bc04 | 345 | .} asection ; |
e98e6ec1 SC |
346 | . |
347 | . | |
348 | .#define BFD_ABS_SECTION_NAME "*ABS*" | |
349 | .#define BFD_UND_SECTION_NAME "*UND*" | |
350 | .#define BFD_COM_SECTION_NAME "*COM*" | |
351 | . | |
352 | . {* the absolute section *} | |
353 | . extern asection bfd_abs_section; | |
354 | . {* Pointer to the undefined section *} | |
355 | . extern asection bfd_und_section; | |
356 | . {* Pointer to the common section *} | |
357 | . extern asection bfd_com_section; | |
358 | . | |
359 | . extern struct symbol_cache_entry *bfd_abs_symbol; | |
360 | . extern struct symbol_cache_entry *bfd_com_symbol; | |
361 | . extern struct symbol_cache_entry *bfd_und_symbol; | |
362 | .#define bfd_get_section_size_before_reloc(section) \ | |
363 | . (section->reloc_done ? (abort(),1): (section)->_raw_size) | |
364 | .#define bfd_get_section_size_after_reloc(section) \ | |
365 | . ((section->reloc_done) ? (section)->_cooked_size: (abort(),1)) | |
985fca12 SC |
366 | */ |
367 | ||
fefb4b30 JG |
368 | /* These symbols are global, not specific to any BFD. Therefore, anything |
369 | that tries to change them is broken, and should be repaired. */ | |
370 | static CONST asymbol global_syms[] = { | |
371 | /* bfd, name, value, attr, section [, udata] */ | |
372 | { 0, BFD_COM_SECTION_NAME, 0, BSF_SECTION_SYM, &bfd_com_section }, | |
373 | { 0, BFD_UND_SECTION_NAME, 0, BSF_SECTION_SYM, &bfd_und_section }, | |
374 | { 0, BFD_ABS_SECTION_NAME, 0, BSF_SECTION_SYM, &bfd_abs_section }, | |
375 | }; | |
376 | ||
377 | #define STD_SECTION(SEC,SYM,NAME, IDX) \ | |
378 | asymbol *SYM = (asymbol *) &global_syms[IDX]; \ | |
379 | asection SEC = { NAME, 0, 0, 0, 0, (boolean) 0, 0, 0, 0, &SEC,\ | |
380 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, (boolean) 0, \ | |
381 | (asymbol *) &global_syms[IDX], &SYM, } | |
382 | ||
383 | STD_SECTION (bfd_com_section, bfd_com_symbol, BFD_COM_SECTION_NAME, 0); | |
384 | STD_SECTION (bfd_und_section, bfd_und_symbol, BFD_UND_SECTION_NAME, 1); | |
385 | STD_SECTION (bfd_abs_section, bfd_abs_symbol, BFD_ABS_SECTION_NAME, 2); | |
386 | #undef STD_SECTION | |
e98e6ec1 SC |
387 | |
388 | /* | |
fefb4b30 JG |
389 | DOCDD |
390 | INODE | |
391 | section prototypes, , typedef asection, Sections | |
4a96bc04 SC |
392 | SUBSECTION |
393 | section prototypes | |
985fca12 | 394 | |
4a96bc04 SC |
395 | These are the functions exported by the section handling part of |
396 | <<libbfd>. | |
397 | */ | |
985fca12 | 398 | |
4a96bc04 SC |
399 | /* |
400 | FUNCTION | |
401 | bfd_get_section_by_name | |
985fca12 | 402 | |
4a96bc04 SC |
403 | SYNOPSIS |
404 | asection *bfd_get_section_by_name(bfd *abfd, CONST char *name); | |
985fca12 | 405 | |
4a96bc04 SC |
406 | DESCRIPTION |
407 | Runs through the provided @var{abfd} and returns the | |
408 | <<asection>> who's name matches that provided, otherwise NULL. | |
409 | @xref{Sections}, for more information. | |
985fca12 | 410 | |
4a96bc04 | 411 | */ |
985fca12 | 412 | |
4a96bc04 SC |
413 | asection * |
414 | DEFUN(bfd_get_section_by_name,(abfd, name), | |
415 | bfd *abfd AND | |
416 | CONST char *name) | |
417 | { | |
418 | asection *sect; | |
985fca12 | 419 | |
4a96bc04 SC |
420 | for (sect = abfd->sections; sect != NULL; sect = sect->next) |
421 | if (!strcmp (sect->name, name)) return sect; | |
422 | return NULL; | |
423 | } | |
985fca12 | 424 | |
985fca12 | 425 | |
4a96bc04 SC |
426 | /* |
427 | FUNCTION | |
428 | bfd_make_section_old_way | |
985fca12 | 429 | |
4a96bc04 SC |
430 | SYNOPSIS |
431 | asection *bfd_make_section_old_way(bfd *, CONST char *name); | |
985fca12 | 432 | |
4a96bc04 SC |
433 | DESCRIPTION |
434 | This function creates a new empty section called @var{name} | |
435 | and attaches it to the end of the chain of sections for the | |
436 | BFD supplied. An attempt to create a section with a name which | |
437 | is already in use, returns its pointer without changing the | |
438 | section chain. | |
985fca12 | 439 | |
4a96bc04 SC |
440 | It has the funny name since this is the way it used to be |
441 | before is was rewritten... | |
985fca12 | 442 | |
4a96bc04 | 443 | Possible errors are: |
fefb4b30 | 444 | o invalid_operation - |
4a96bc04 | 445 | If output has already started for this BFD. |
fefb4b30 | 446 | o no_memory - |
4a96bc04 | 447 | If obstack alloc fails. |
985fca12 SC |
448 | |
449 | */ | |
450 | ||
985fca12 | 451 | |
985fca12 | 452 | asection * |
4a96bc04 | 453 | DEFUN(bfd_make_section_old_way,(abfd, name), |
985fca12 | 454 | bfd *abfd AND |
4a96bc04 | 455 | CONST char * name) |
985fca12 | 456 | { |
4a96bc04 SC |
457 | asection *sec = bfd_get_section_by_name(abfd, name); |
458 | if (sec == (asection *)NULL) | |
459 | { | |
460 | sec = bfd_make_section(abfd, name); | |
461 | } | |
462 | return sec; | |
985fca12 SC |
463 | } |
464 | ||
465 | ||
4a96bc04 SC |
466 | /* |
467 | FUNCTION | |
468 | bfd_make_section | |
985fca12 | 469 | |
4a96bc04 SC |
470 | SYNOPSIS |
471 | asection * bfd_make_section(bfd *, CONST char *name); | |
985fca12 | 472 | |
4a96bc04 SC |
473 | DESCRIPTION |
474 | This function creates a new empty section called @var{name} | |
475 | and attaches it to the end of the chain of sections for the | |
476 | BFD supplied. An attempt to create a section with a name which | |
477 | is already in use, returns NULL without changing the section | |
478 | chain. | |
479 | ||
480 | Possible errors are: | |
481 | o invalid_operation - If output has already started for this BFD. | |
482 | o no_memory - If obstack alloc fails. | |
985fca12 SC |
483 | */ |
484 | ||
485 | ||
486 | ||
487 | sec_ptr | |
488 | DEFUN(bfd_make_section,(abfd, name), | |
489 | bfd *abfd AND | |
490 | CONST char * name) | |
491 | { | |
492 | asection *newsect; | |
493 | asection ** prev = &abfd->sections; | |
494 | asection * sect = abfd->sections; | |
495 | ||
496 | if (abfd->output_has_begun) { | |
497 | bfd_error = invalid_operation; | |
498 | return NULL; | |
499 | } | |
500 | ||
e98e6ec1 SC |
501 | if (strcmp(name, BFD_ABS_SECTION_NAME) == 0) |
502 | { | |
503 | return &bfd_abs_section; | |
504 | } | |
505 | if (strcmp(name, BFD_COM_SECTION_NAME) == 0) | |
506 | { | |
507 | return &bfd_com_section; | |
508 | } | |
509 | if (strcmp(name, BFD_UND_SECTION_NAME) == 0) | |
510 | { | |
511 | return &bfd_und_section; | |
512 | } | |
513 | ||
985fca12 | 514 | while (sect) { |
cbdc7909 | 515 | if (!strcmp(sect->name, name)) return NULL; |
985fca12 SC |
516 | prev = §->next; |
517 | sect = sect->next; | |
518 | } | |
519 | ||
520 | newsect = (asection *) bfd_zalloc(abfd, sizeof (asection)); | |
521 | if (newsect == NULL) { | |
522 | bfd_error = no_memory; | |
523 | return NULL; | |
524 | } | |
525 | ||
526 | newsect->name = name; | |
527 | newsect->index = abfd->section_count++; | |
528 | newsect->flags = SEC_NO_FLAGS; | |
529 | ||
530 | newsect->userdata = 0; | |
531 | newsect->next = (asection *)NULL; | |
532 | newsect->relocation = (arelent *)NULL; | |
533 | newsect->reloc_count = 0; | |
534 | newsect->line_filepos =0; | |
535 | newsect->owner = abfd; | |
e98e6ec1 | 536 | |
fefb4b30 JG |
537 | /* Create a symbol whos only job is to point to this section. This is |
538 | useful for things like relocs which are relative to the base of a | |
539 | section. */ | |
e98e6ec1 SC |
540 | newsect->symbol = bfd_make_empty_symbol(abfd); |
541 | newsect->symbol->name = name; | |
542 | newsect->symbol->value = 0; | |
543 | newsect->symbol->section = newsect; | |
544 | newsect->symbol->flags = BSF_SECTION_SYM; | |
545 | ||
546 | ||
547 | newsect->symbol_ptr_ptr = &newsect->symbol; | |
548 | ||
985fca12 SC |
549 | if (BFD_SEND (abfd, _new_section_hook, (abfd, newsect)) != true) { |
550 | free (newsect); | |
551 | return NULL; | |
552 | } | |
553 | ||
554 | *prev = newsect; | |
555 | return newsect; | |
556 | } | |
557 | ||
558 | ||
4a96bc04 SC |
559 | /* |
560 | FUNCTION | |
561 | bfd_set_section_flags | |
562 | ||
563 | SYNOPSIS | |
564 | boolean bfd_set_section_flags(bfd *, asection *, flagword); | |
565 | ||
566 | DESCRIPTION | |
567 | Attempts to set the attributes of the section named in the BFD | |
568 | supplied to the value. Returns true on success, false on | |
569 | error. Possible error returns are: | |
570 | ||
fefb4b30 | 571 | o invalid operation - |
4a96bc04 SC |
572 | The section cannot have one or more of the attributes |
573 | requested. For example, a .bss section in <<a.out>> may not | |
574 | have the <<SEC_HAS_CONTENTS>> field set. | |
985fca12 | 575 | |
985fca12 SC |
576 | */ |
577 | ||
578 | boolean | |
579 | DEFUN(bfd_set_section_flags,(abfd, section, flags), | |
580 | bfd *abfd AND | |
581 | sec_ptr section AND | |
582 | flagword flags) | |
583 | { | |
fefb4b30 JG |
584 | #if 0 |
585 | /* If you try to copy a text section from an input file (where it | |
586 | has the SEC_CODE flag set) to an output file, this loses big if | |
587 | the bfd_applicable_section_flags (abfd) doesn't have the SEC_CODE | |
588 | set - which it doesn't, at least not for a.out. FIXME */ | |
589 | ||
985fca12 SC |
590 | if ((flags & bfd_applicable_section_flags (abfd)) != flags) { |
591 | bfd_error = invalid_operation; | |
592 | return false; | |
593 | } | |
fefb4b30 | 594 | #endif |
985fca12 SC |
595 | |
596 | section->flags = flags; | |
597 | return true; | |
598 | } | |
599 | ||
600 | ||
4a96bc04 SC |
601 | /* |
602 | FUNCTION | |
603 | bfd_map_over_sections | |
604 | ||
605 | SYNOPSIS | |
fefb4b30 JG |
606 | void bfd_map_over_sections(bfd *abfd, |
607 | void (*func)(bfd *abfd, | |
608 | asection *sect, | |
609 | PTR obj), | |
610 | PTR obj); | |
985fca12 | 611 | |
4a96bc04 SC |
612 | DESCRIPTION |
613 | Calls the provided function @var{func} for each section | |
614 | attached to the BFD @var{abfd}, passing @var{obj} as an | |
615 | argument. The function will be called as if by | |
985fca12 | 616 | |
4a96bc04 | 617 | | func(abfd, the_section, obj); |
985fca12 | 618 | |
4a96bc04 SC |
619 | This is the prefered method for iterating over sections, an |
620 | alternative would be to use a loop: | |
621 | ||
622 | | section *p; | |
623 | | for (p = abfd->sections; p != NULL; p = p->next) | |
624 | | func(abfd, p, ...) | |
985fca12 | 625 | |
985fca12 | 626 | |
985fca12 SC |
627 | */ |
628 | ||
629 | /*VARARGS2*/ | |
630 | void | |
631 | DEFUN(bfd_map_over_sections,(abfd, operation, user_storage), | |
632 | bfd *abfd AND | |
fefb4b30 | 633 | void (*operation) PARAMS ((bfd *abfd, asection *sect, PTR obj)) AND |
985fca12 SC |
634 | PTR user_storage) |
635 | { | |
636 | asection *sect; | |
637 | int i = 0; | |
638 | ||
639 | for (sect = abfd->sections; sect != NULL; i++, sect = sect->next) | |
640 | (*operation) (abfd, sect, user_storage); | |
641 | ||
642 | if (i != abfd->section_count) /* Debugging */ | |
643 | abort(); | |
644 | } | |
645 | ||
646 | ||
4a96bc04 SC |
647 | /* |
648 | FUNCTION | |
649 | bfd_set_section_size | |
650 | ||
651 | SYNOPSIS | |
652 | boolean bfd_set_section_size(bfd *, asection *, bfd_size_type val); | |
985fca12 | 653 | |
4a96bc04 SC |
654 | DESCRIPTION |
655 | Sets @var{section} to the size @var{val}. If the operation is | |
656 | ok, then <<true>> is returned, else <<false>>. | |
657 | ||
658 | Possible error returns: | |
fefb4b30 | 659 | o invalid_operation - |
4a96bc04 | 660 | Writing has started to the BFD, so setting the size is invalid |
985fca12 | 661 | |
985fca12 SC |
662 | */ |
663 | ||
664 | boolean | |
665 | DEFUN(bfd_set_section_size,(abfd, ptr, val), | |
666 | bfd *abfd AND | |
667 | sec_ptr ptr AND | |
6724ff46 | 668 | bfd_size_type val) |
985fca12 SC |
669 | { |
670 | /* Once you've started writing to any section you cannot create or change | |
671 | the size of any others. */ | |
672 | ||
673 | if (abfd->output_has_begun) { | |
674 | bfd_error = invalid_operation; | |
675 | return false; | |
676 | } | |
677 | ||
e98e6ec1 SC |
678 | ptr->_cooked_size = val; |
679 | ptr->_raw_size = val; | |
985fca12 SC |
680 | |
681 | return true; | |
682 | } | |
683 | ||
4a96bc04 SC |
684 | /* |
685 | FUNCTION | |
686 | bfd_set_section_contents | |
687 | ||
688 | SYNOPSIS | |
689 | boolean bfd_set_section_contents | |
985fca12 SC |
690 | (bfd *abfd, |
691 | asection *section, | |
692 | PTR data, | |
693 | file_ptr offset, | |
4a96bc04 SC |
694 | bfd_size_type count); |
695 | ||
696 | ||
697 | DESCRIPTION | |
698 | Sets the contents of the section @var{section} in BFD | |
699 | @var{abfd} to the data starting in memory at @var{data}. The | |
700 | data is written to the output section starting at offset | |
701 | @var{offset} for @var{count} bytes. | |
702 | ||
e98e6ec1 SC |
703 | |
704 | ||
4a96bc04 SC |
705 | Normally <<true>> is returned, else <<false>>. Possible error |
706 | returns are: | |
fefb4b30 | 707 | o no_contents - |
4a96bc04 SC |
708 | The output section does not have the <<SEC_HAS_CONTENTS>> |
709 | attribute, so nothing can be written to it. | |
710 | o and some more too | |
711 | ||
712 | This routine is front end to the back end function | |
713 | <<_bfd_set_section_contents>>. | |
714 | ||
985fca12 SC |
715 | |
716 | */ | |
717 | ||
fefb4b30 JG |
718 | #define bfd_get_section_size_now(abfd,sec) \ |
719 | (sec->reloc_done \ | |
720 | ? bfd_get_section_size_after_reloc (sec) \ | |
721 | : bfd_get_section_size_before_reloc (sec)) | |
722 | ||
985fca12 SC |
723 | boolean |
724 | DEFUN(bfd_set_section_contents,(abfd, section, location, offset, count), | |
725 | bfd *abfd AND | |
726 | sec_ptr section AND | |
727 | PTR location AND | |
728 | file_ptr offset AND | |
729 | bfd_size_type count) | |
730 | { | |
fefb4b30 JG |
731 | bfd_size_type sz; |
732 | ||
985fca12 SC |
733 | if (!(bfd_get_section_flags(abfd, section) & SEC_HAS_CONTENTS)) |
734 | { | |
735 | bfd_error = no_contents; | |
736 | return(false); | |
fefb4b30 JG |
737 | } |
738 | ||
739 | if (offset < 0 || count < 0) | |
740 | { | |
741 | bad_val: | |
742 | bfd_error = bad_value; | |
743 | return false; | |
744 | } | |
745 | sz = bfd_get_section_size_now (abfd, section); | |
746 | if (offset > sz | |
747 | || count > sz | |
748 | || offset + count > sz) | |
749 | goto bad_val; | |
985fca12 SC |
750 | |
751 | if (BFD_SEND (abfd, _bfd_set_section_contents, | |
752 | (abfd, section, location, offset, count))) | |
753 | { | |
754 | abfd->output_has_begun = true; | |
755 | return true; | |
756 | } | |
757 | ||
758 | return false; | |
759 | } | |
760 | ||
4a96bc04 SC |
761 | /* |
762 | FUNCTION | |
763 | bfd_get_section_contents | |
985fca12 | 764 | |
4a96bc04 SC |
765 | SYNOPSIS |
766 | boolean bfd_get_section_contents | |
767 | (bfd *abfd, asection *section, PTR location, | |
768 | file_ptr offset, bfd_size_type count); | |
985fca12 | 769 | |
4a96bc04 SC |
770 | DESCRIPTION |
771 | This function reads data from @var{section} in BFD @var{abfd} | |
772 | into memory starting at @var{location}. The data is read at an | |
773 | offset of @var{offset} from the start of the input section, | |
774 | and is read for @var{count} bytes. | |
985fca12 | 775 | |
4a96bc04 SC |
776 | If the contents of a constuctor with the <<SEC_CONSTUCTOR>> |
777 | flag set are requested, then the @var{location} is filled with | |
778 | zeroes. If no errors occur, <<true>> is returned, else | |
779 | <<false>>. | |
985fca12 | 780 | |
985fca12 SC |
781 | |
782 | ||
783 | */ | |
784 | boolean | |
785 | DEFUN(bfd_get_section_contents,(abfd, section, location, offset, count), | |
786 | bfd *abfd AND | |
787 | sec_ptr section AND | |
788 | PTR location AND | |
789 | file_ptr offset AND | |
790 | bfd_size_type count) | |
791 | { | |
fefb4b30 | 792 | bfd_size_type sz; |
e98e6ec1 | 793 | |
fefb4b30 JG |
794 | if (section->flags & SEC_CONSTRUCTOR) |
795 | { | |
796 | memset(location, 0, (unsigned)count); | |
797 | return true; | |
798 | } | |
e98e6ec1 | 799 | |
fefb4b30 JG |
800 | if (offset < 0 || count < 0) |
801 | { | |
802 | bad_val: | |
803 | bfd_error = bad_value; | |
804 | return false; | |
805 | } | |
806 | sz = bfd_get_section_size_now (abfd, section); | |
807 | if (offset > sz | |
808 | || count > sz | |
809 | || offset + count > sz) | |
810 | goto bad_val; | |
811 | ||
812 | if (count == 0) | |
813 | /* Don't bother. */ | |
814 | return true; | |
815 | ||
816 | return BFD_SEND (abfd, _bfd_get_section_contents, | |
817 | (abfd, section, location, offset, count)); | |
e98e6ec1 | 818 | } |