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252b5132 | 1 | /* Object file "section" support for the BFD library. |
52b219b5 | 2 | Copyright (C) 1990, 91, 92, 93, 94, 95, 96, 97, 98, 99, 2000 |
252b5132 RH |
3 | Free Software Foundation, Inc. |
4 | Written by Cygnus Support. | |
5 | ||
6 | This file is part of BFD, the Binary File Descriptor library. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
21 | ||
22 | /* | |
23 | SECTION | |
24 | Sections | |
25 | ||
26 | The raw data contained within a BFD is maintained through the | |
27 | section abstraction. A single BFD may have any number of | |
28 | sections. It keeps hold of them by pointing to the first; | |
29 | each one points to the next in the list. | |
30 | ||
31 | Sections are supported in BFD in <<section.c>>. | |
32 | ||
33 | @menu | |
34 | @* Section Input:: | |
35 | @* Section Output:: | |
36 | @* typedef asection:: | |
37 | @* section prototypes:: | |
38 | @end menu | |
39 | ||
40 | INODE | |
41 | Section Input, Section Output, Sections, Sections | |
42 | SUBSECTION | |
43 | Section input | |
44 | ||
45 | When a BFD is opened for reading, the section structures are | |
46 | created and attached to the BFD. | |
47 | ||
48 | Each section has a name which describes the section in the | |
49 | outside world---for example, <<a.out>> would contain at least | |
50 | three sections, called <<.text>>, <<.data>> and <<.bss>>. | |
51 | ||
52 | Names need not be unique; for example a COFF file may have several | |
53 | sections named <<.data>>. | |
54 | ||
55 | Sometimes a BFD will contain more than the ``natural'' number of | |
56 | sections. A back end may attach other sections containing | |
57 | constructor data, or an application may add a section (using | |
58 | <<bfd_make_section>>) to the sections attached to an already open | |
59 | BFD. For example, the linker creates an extra section | |
60 | <<COMMON>> for each input file's BFD to hold information about | |
61 | common storage. | |
62 | ||
63 | The raw data is not necessarily read in when | |
64 | the section descriptor is created. Some targets may leave the | |
65 | data in place until a <<bfd_get_section_contents>> call is | |
66 | made. Other back ends may read in all the data at once. For | |
67 | example, an S-record file has to be read once to determine the | |
68 | size of the data. An IEEE-695 file doesn't contain raw data in | |
69 | sections, but data and relocation expressions intermixed, so | |
70 | the data area has to be parsed to get out the data and | |
71 | relocations. | |
72 | ||
73 | INODE | |
74 | Section Output, typedef asection, Section Input, Sections | |
75 | ||
76 | SUBSECTION | |
77 | Section output | |
78 | ||
79 | To write a new object style BFD, the various sections to be | |
80 | written have to be created. They are attached to the BFD in | |
81 | the same way as input sections; data is written to the | |
82 | sections using <<bfd_set_section_contents>>. | |
83 | ||
84 | Any program that creates or combines sections (e.g., the assembler | |
85 | and linker) must use the <<asection>> fields <<output_section>> and | |
86 | <<output_offset>> to indicate the file sections to which each | |
87 | section must be written. (If the section is being created from | |
88 | scratch, <<output_section>> should probably point to the section | |
89 | itself and <<output_offset>> should probably be zero.) | |
90 | ||
91 | The data to be written comes from input sections attached | |
92 | (via <<output_section>> pointers) to | |
93 | the output sections. The output section structure can be | |
94 | considered a filter for the input section: the output section | |
95 | determines the vma of the output data and the name, but the | |
96 | input section determines the offset into the output section of | |
97 | the data to be written. | |
98 | ||
99 | E.g., to create a section "O", starting at 0x100, 0x123 long, | |
100 | containing two subsections, "A" at offset 0x0 (i.e., at vma | |
101 | 0x100) and "B" at offset 0x20 (i.e., at vma 0x120) the <<asection>> | |
102 | structures would look like: | |
103 | ||
104 | | section name "A" | |
105 | | output_offset 0x00 | |
106 | | size 0x20 | |
107 | | output_section -----------> section name "O" | |
108 | | | vma 0x100 | |
109 | | section name "B" | size 0x123 | |
110 | | output_offset 0x20 | | |
111 | | size 0x103 | | |
112 | | output_section --------| | |
113 | ||
114 | ||
115 | SUBSECTION | |
116 | Link orders | |
117 | ||
118 | The data within a section is stored in a @dfn{link_order}. | |
119 | These are much like the fixups in <<gas>>. The link_order | |
120 | abstraction allows a section to grow and shrink within itself. | |
121 | ||
122 | A link_order knows how big it is, and which is the next | |
123 | link_order and where the raw data for it is; it also points to | |
124 | a list of relocations which apply to it. | |
125 | ||
126 | The link_order is used by the linker to perform relaxing on | |
127 | final code. The compiler creates code which is as big as | |
128 | necessary to make it work without relaxing, and the user can | |
129 | select whether to relax. Sometimes relaxing takes a lot of | |
130 | time. The linker runs around the relocations to see if any | |
131 | are attached to data which can be shrunk, if so it does it on | |
132 | a link_order by link_order basis. | |
133 | ||
134 | */ | |
135 | ||
136 | ||
137 | #include "bfd.h" | |
138 | #include "sysdep.h" | |
139 | #include "libbfd.h" | |
140 | #include "bfdlink.h" | |
141 | ||
142 | /* | |
143 | DOCDD | |
144 | INODE | |
145 | typedef asection, section prototypes, Section Output, Sections | |
146 | SUBSECTION | |
147 | typedef asection | |
148 | ||
149 | Here is the section structure: | |
150 | ||
151 | CODE_FRAGMENT | |
152 | . | |
52b219b5 AM |
153 | .{* This structure is used for a comdat section, as in PE. A comdat |
154 | . section is associated with a particular symbol. When the linker | |
155 | . sees a comdat section, it keeps only one of the sections with a | |
156 | . given name and associated with a given symbol. *} | |
022a5af4 ILT |
157 | . |
158 | .struct bfd_comdat_info | |
159 | .{ | |
160 | . {* The name of the symbol associated with a comdat section. *} | |
161 | . const char *name; | |
162 | . | |
163 | . {* The local symbol table index of the symbol associated with a | |
164 | . comdat section. This is only meaningful to the object file format | |
165 | . specific code; it is not an index into the list returned by | |
166 | . bfd_canonicalize_symtab. *} | |
167 | . long symbol; | |
168 | . | |
169 | . {* If this section is being discarded, the linker uses this field | |
170 | . to point to the input section which is being kept. *} | |
171 | . struct sec *sec; | |
172 | .}; | |
173 | . | |
252b5132 RH |
174 | .typedef struct sec |
175 | .{ | |
52b219b5 AM |
176 | . {* The name of the section; the name isn't a copy, the pointer is |
177 | . the same as that passed to bfd_make_section. *} | |
252b5132 | 178 | . |
52b219b5 AM |
179 | . const char *name; |
180 | . | |
181 | . {* A unique sequence number. *} | |
182 | . | |
183 | . int id; | |
252b5132 | 184 | . |
52b219b5 | 185 | . {* Which section is it; 0..nth. *} |
252b5132 | 186 | . |
52b219b5 | 187 | . int index; |
252b5132 | 188 | . |
52b219b5 | 189 | . {* The next section in the list belonging to the BFD, or NULL. *} |
252b5132 | 190 | . |
52b219b5 | 191 | . struct sec *next; |
252b5132 | 192 | . |
52b219b5 AM |
193 | . {* The field flags contains attributes of the section. Some |
194 | . flags are read in from the object file, and some are | |
195 | . synthesized from other information. *} | |
252b5132 | 196 | . |
52b219b5 | 197 | . flagword flags; |
252b5132 RH |
198 | . |
199 | .#define SEC_NO_FLAGS 0x000 | |
200 | . | |
52b219b5 AM |
201 | . {* Tells the OS to allocate space for this section when loading. |
202 | . This is clear for a section containing debug information only. *} | |
252b5132 RH |
203 | .#define SEC_ALLOC 0x001 |
204 | . | |
52b219b5 AM |
205 | . {* Tells the OS to load the section from the file when loading. |
206 | . This is clear for a .bss section. *} | |
252b5132 RH |
207 | .#define SEC_LOAD 0x002 |
208 | . | |
52b219b5 AM |
209 | . {* The section contains data still to be relocated, so there is |
210 | . some relocation information too. *} | |
252b5132 RH |
211 | .#define SEC_RELOC 0x004 |
212 | . | |
213 | .#if 0 {* Obsolete ? *} | |
214 | .#define SEC_BALIGN 0x008 | |
215 | .#endif | |
216 | . | |
52b219b5 | 217 | . {* A signal to the OS that the section contains read only data. *} |
252b5132 RH |
218 | .#define SEC_READONLY 0x010 |
219 | . | |
52b219b5 | 220 | . {* The section contains code only. *} |
252b5132 RH |
221 | .#define SEC_CODE 0x020 |
222 | . | |
52b219b5 | 223 | . {* The section contains data only. *} |
252b5132 RH |
224 | .#define SEC_DATA 0x040 |
225 | . | |
52b219b5 | 226 | . {* The section will reside in ROM. *} |
252b5132 RH |
227 | .#define SEC_ROM 0x080 |
228 | . | |
52b219b5 AM |
229 | . {* The section contains constructor information. This section |
230 | . type is used by the linker to create lists of constructors and | |
231 | . destructors used by <<g++>>. When a back end sees a symbol | |
232 | . which should be used in a constructor list, it creates a new | |
233 | . section for the type of name (e.g., <<__CTOR_LIST__>>), attaches | |
234 | . the symbol to it, and builds a relocation. To build the lists | |
235 | . of constructors, all the linker has to do is catenate all the | |
236 | . sections called <<__CTOR_LIST__>> and relocate the data | |
237 | . contained within - exactly the operations it would peform on | |
238 | . standard data. *} | |
252b5132 RH |
239 | .#define SEC_CONSTRUCTOR 0x100 |
240 | . | |
52b219b5 AM |
241 | . {* The section is a constructor, and should be placed at the |
242 | . end of the text, data, or bss section(?). *} | |
252b5132 RH |
243 | .#define SEC_CONSTRUCTOR_TEXT 0x1100 |
244 | .#define SEC_CONSTRUCTOR_DATA 0x2100 | |
245 | .#define SEC_CONSTRUCTOR_BSS 0x3100 | |
246 | . | |
52b219b5 AM |
247 | . {* The section has contents - a data section could be |
248 | . <<SEC_ALLOC>> | <<SEC_HAS_CONTENTS>>; a debug section could be | |
249 | . <<SEC_HAS_CONTENTS>> *} | |
252b5132 RH |
250 | .#define SEC_HAS_CONTENTS 0x200 |
251 | . | |
52b219b5 AM |
252 | . {* An instruction to the linker to not output the section |
253 | . even if it has information which would normally be written. *} | |
252b5132 RH |
254 | .#define SEC_NEVER_LOAD 0x400 |
255 | . | |
52b219b5 AM |
256 | . {* The section is a COFF shared library section. This flag is |
257 | . only for the linker. If this type of section appears in | |
258 | . the input file, the linker must copy it to the output file | |
259 | . without changing the vma or size. FIXME: Although this | |
260 | . was originally intended to be general, it really is COFF | |
261 | . specific (and the flag was renamed to indicate this). It | |
262 | . might be cleaner to have some more general mechanism to | |
263 | . allow the back end to control what the linker does with | |
264 | . sections. *} | |
252b5132 RH |
265 | .#define SEC_COFF_SHARED_LIBRARY 0x800 |
266 | . | |
1bd91689 AM |
267 | . {* The section has GOT references. This flag is only for the |
268 | . linker, and is currently only used by the elf32-hppa back end. | |
269 | . It will be set if global offset table references were detected | |
270 | . in this section, which indicate to the linker that the section | |
271 | . contains PIC code, and must be handled specially when doing a | |
272 | . static link. *} | |
273 | .#define SEC_HAS_GOT_REF 0x4000 | |
274 | . | |
52b219b5 AM |
275 | . {* The section contains common symbols (symbols may be defined |
276 | . multiple times, the value of a symbol is the amount of | |
277 | . space it requires, and the largest symbol value is the one | |
278 | . used). Most targets have exactly one of these (which we | |
279 | . translate to bfd_com_section_ptr), but ECOFF has two. *} | |
252b5132 RH |
280 | .#define SEC_IS_COMMON 0x8000 |
281 | . | |
52b219b5 AM |
282 | . {* The section contains only debugging information. For |
283 | . example, this is set for ELF .debug and .stab sections. | |
284 | . strip tests this flag to see if a section can be | |
285 | . discarded. *} | |
252b5132 RH |
286 | .#define SEC_DEBUGGING 0x10000 |
287 | . | |
52b219b5 AM |
288 | . {* The contents of this section are held in memory pointed to |
289 | . by the contents field. This is checked by bfd_get_section_contents, | |
290 | . and the data is retrieved from memory if appropriate. *} | |
252b5132 RH |
291 | .#define SEC_IN_MEMORY 0x20000 |
292 | . | |
52b219b5 AM |
293 | . {* The contents of this section are to be excluded by the |
294 | . linker for executable and shared objects unless those | |
295 | . objects are to be further relocated. *} | |
252b5132 RH |
296 | .#define SEC_EXCLUDE 0x40000 |
297 | . | |
52b219b5 AM |
298 | . {* The contents of this section are to be sorted by the |
299 | . based on the address specified in the associated symbol | |
300 | . table. *} | |
252b5132 RH |
301 | .#define SEC_SORT_ENTRIES 0x80000 |
302 | . | |
52b219b5 AM |
303 | . {* When linking, duplicate sections of the same name should be |
304 | . discarded, rather than being combined into a single section as | |
305 | . is usually done. This is similar to how common symbols are | |
306 | . handled. See SEC_LINK_DUPLICATES below. *} | |
252b5132 RH |
307 | .#define SEC_LINK_ONCE 0x100000 |
308 | . | |
52b219b5 AM |
309 | . {* If SEC_LINK_ONCE is set, this bitfield describes how the linker |
310 | . should handle duplicate sections. *} | |
252b5132 RH |
311 | .#define SEC_LINK_DUPLICATES 0x600000 |
312 | . | |
52b219b5 AM |
313 | . {* This value for SEC_LINK_DUPLICATES means that duplicate |
314 | . sections with the same name should simply be discarded. *} | |
252b5132 RH |
315 | .#define SEC_LINK_DUPLICATES_DISCARD 0x0 |
316 | . | |
52b219b5 AM |
317 | . {* This value for SEC_LINK_DUPLICATES means that the linker |
318 | . should warn if there are any duplicate sections, although | |
319 | . it should still only link one copy. *} | |
252b5132 RH |
320 | .#define SEC_LINK_DUPLICATES_ONE_ONLY 0x200000 |
321 | . | |
52b219b5 AM |
322 | . {* This value for SEC_LINK_DUPLICATES means that the linker |
323 | . should warn if any duplicate sections are a different size. *} | |
252b5132 RH |
324 | .#define SEC_LINK_DUPLICATES_SAME_SIZE 0x400000 |
325 | . | |
52b219b5 AM |
326 | . {* This value for SEC_LINK_DUPLICATES means that the linker |
327 | . should warn if any duplicate sections contain different | |
328 | . contents. *} | |
252b5132 RH |
329 | .#define SEC_LINK_DUPLICATES_SAME_CONTENTS 0x600000 |
330 | . | |
52b219b5 AM |
331 | . {* This section was created by the linker as part of dynamic |
332 | . relocation or other arcane processing. It is skipped when | |
333 | . going through the first-pass output, trusting that someone | |
334 | . else up the line will take care of it later. *} | |
252b5132 RH |
335 | .#define SEC_LINKER_CREATED 0x800000 |
336 | . | |
52b219b5 | 337 | . {* This section should not be subject to garbage collection. *} |
252b5132 RH |
338 | .#define SEC_KEEP 0x1000000 |
339 | . | |
52b219b5 AM |
340 | . {* This section contains "short" data, and should be placed |
341 | . "near" the GP. *} | |
851edbaf | 342 | .#define SEC_SMALL_DATA 0x2000000 |
0c3ff40b | 343 | . |
52b219b5 AM |
344 | . {* This section contains data which may be shared with other |
345 | . executables or shared objects. *} | |
bd826630 ILT |
346 | .#define SEC_SHARED 0x4000000 |
347 | . | |
52b219b5 AM |
348 | . {* When a section with this flag is being linked, then if the size of |
349 | . the input section is less than a page, it should not cross a page | |
350 | . boundary. If the size of the input section is one page or more, it | |
351 | . should be aligned on a page boundary. *} | |
34cbe64e TW |
352 | .#define SEC_BLOCK 0x8000000 |
353 | . | |
52b219b5 AM |
354 | . {* Conditionally link this section; do not link if there are no |
355 | . references found to any symbol in the section. *} | |
34cbe64e TW |
356 | .#define SEC_CLINK 0x10000000 |
357 | . | |
52b219b5 | 358 | . {* End of section flags. *} |
252b5132 | 359 | . |
52b219b5 | 360 | . {* Some internal packed boolean fields. *} |
252b5132 | 361 | . |
52b219b5 AM |
362 | . {* See the vma field. *} |
363 | . unsigned int user_set_vma : 1; | |
252b5132 | 364 | . |
52b219b5 AM |
365 | . {* Whether relocations have been processed. *} |
366 | . unsigned int reloc_done : 1; | |
252b5132 | 367 | . |
52b219b5 AM |
368 | . {* A mark flag used by some of the linker backends. *} |
369 | . unsigned int linker_mark : 1; | |
252b5132 | 370 | . |
52b219b5 AM |
371 | . {* A mark flag used by some linker backends for garbage collection. *} |
372 | . unsigned int gc_mark : 1; | |
252b5132 | 373 | . |
bc67d8a6 NC |
374 | . {* Used by the ELF code to mark sections which have been allocated to segments. *} |
375 | . unsigned int segment_mark : 1; | |
376 | . | |
52b219b5 | 377 | . {* End of internal packed boolean fields. *} |
252b5132 | 378 | . |
52b219b5 AM |
379 | . {* The virtual memory address of the section - where it will be |
380 | . at run time. The symbols are relocated against this. The | |
381 | . user_set_vma flag is maintained by bfd; if it's not set, the | |
382 | . backend can assign addresses (for example, in <<a.out>>, where | |
383 | . the default address for <<.data>> is dependent on the specific | |
384 | . target and various flags). *} | |
252b5132 | 385 | . |
52b219b5 | 386 | . bfd_vma vma; |
252b5132 | 387 | . |
52b219b5 AM |
388 | . {* The load address of the section - where it would be in a |
389 | . rom image; really only used for writing section header | |
390 | . information. *} | |
252b5132 | 391 | . |
52b219b5 | 392 | . bfd_vma lma; |
252b5132 | 393 | . |
52b219b5 AM |
394 | . {* The size of the section in octets, as it will be output. |
395 | . Contains a value even if the section has no contents (e.g., the | |
396 | . size of <<.bss>>). This will be filled in after relocation. *} | |
252b5132 | 397 | . |
52b219b5 | 398 | . bfd_size_type _cooked_size; |
252b5132 | 399 | . |
52b219b5 AM |
400 | . {* The original size on disk of the section, in octets. Normally this |
401 | . value is the same as the size, but if some relaxing has | |
402 | . been done, then this value will be bigger. *} | |
252b5132 | 403 | . |
52b219b5 | 404 | . bfd_size_type _raw_size; |
252b5132 | 405 | . |
52b219b5 AM |
406 | . {* If this section is going to be output, then this value is the |
407 | . offset in *bytes* into the output section of the first byte in the | |
408 | . input section (byte ==> smallest addressable unit on the | |
409 | . target). In most cases, if this was going to start at the | |
410 | . 100th octet (8-bit quantity) in the output section, this value | |
411 | . would be 100. However, if the target byte size is 16 bits | |
412 | . (bfd_octets_per_byte is "2"), this value would be 50. *} | |
252b5132 | 413 | . |
52b219b5 | 414 | . bfd_vma output_offset; |
252b5132 | 415 | . |
52b219b5 | 416 | . {* The output section through which to map on output. *} |
252b5132 | 417 | . |
52b219b5 | 418 | . struct sec *output_section; |
252b5132 | 419 | . |
52b219b5 AM |
420 | . {* The alignment requirement of the section, as an exponent of 2 - |
421 | . e.g., 3 aligns to 2^3 (or 8). *} | |
252b5132 | 422 | . |
52b219b5 | 423 | . unsigned int alignment_power; |
252b5132 | 424 | . |
52b219b5 AM |
425 | . {* If an input section, a pointer to a vector of relocation |
426 | . records for the data in this section. *} | |
252b5132 | 427 | . |
52b219b5 | 428 | . struct reloc_cache_entry *relocation; |
252b5132 | 429 | . |
52b219b5 AM |
430 | . {* If an output section, a pointer to a vector of pointers to |
431 | . relocation records for the data in this section. *} | |
252b5132 | 432 | . |
52b219b5 | 433 | . struct reloc_cache_entry **orelocation; |
252b5132 | 434 | . |
52b219b5 | 435 | . {* The number of relocation records in one of the above *} |
252b5132 | 436 | . |
52b219b5 | 437 | . unsigned reloc_count; |
252b5132 | 438 | . |
52b219b5 AM |
439 | . {* Information below is back end specific - and not always used |
440 | . or updated. *} | |
252b5132 | 441 | . |
52b219b5 | 442 | . {* File position of section data. *} |
252b5132 | 443 | . |
52b219b5 | 444 | . file_ptr filepos; |
252b5132 | 445 | . |
52b219b5 | 446 | . {* File position of relocation info. *} |
252b5132 | 447 | . |
52b219b5 | 448 | . file_ptr rel_filepos; |
252b5132 | 449 | . |
52b219b5 | 450 | . {* File position of line data. *} |
252b5132 | 451 | . |
52b219b5 | 452 | . file_ptr line_filepos; |
252b5132 | 453 | . |
52b219b5 | 454 | . {* Pointer to data for applications. *} |
252b5132 | 455 | . |
52b219b5 | 456 | . PTR userdata; |
252b5132 | 457 | . |
52b219b5 AM |
458 | . {* If the SEC_IN_MEMORY flag is set, this points to the actual |
459 | . contents. *} | |
460 | . unsigned char *contents; | |
252b5132 | 461 | . |
52b219b5 | 462 | . {* Attached line number information. *} |
252b5132 | 463 | . |
52b219b5 | 464 | . alent *lineno; |
252b5132 | 465 | . |
52b219b5 | 466 | . {* Number of line number records. *} |
252b5132 | 467 | . |
52b219b5 | 468 | . unsigned int lineno_count; |
252b5132 | 469 | . |
52b219b5 | 470 | . {* Optional information about a COMDAT entry; NULL if not COMDAT. *} |
022a5af4 | 471 | . |
52b219b5 | 472 | . struct bfd_comdat_info *comdat; |
022a5af4 | 473 | . |
52b219b5 AM |
474 | . {* When a section is being output, this value changes as more |
475 | . linenumbers are written out. *} | |
252b5132 | 476 | . |
52b219b5 | 477 | . file_ptr moving_line_filepos; |
252b5132 | 478 | . |
52b219b5 | 479 | . {* What the section number is in the target world. *} |
252b5132 | 480 | . |
52b219b5 | 481 | . int target_index; |
252b5132 | 482 | . |
52b219b5 | 483 | . PTR used_by_bfd; |
252b5132 | 484 | . |
52b219b5 AM |
485 | . {* If this is a constructor section then here is a list of the |
486 | . relocations created to relocate items within it. *} | |
252b5132 | 487 | . |
52b219b5 | 488 | . struct relent_chain *constructor_chain; |
252b5132 | 489 | . |
52b219b5 | 490 | . {* The BFD which owns the section. *} |
252b5132 | 491 | . |
52b219b5 | 492 | . bfd *owner; |
252b5132 | 493 | . |
52b219b5 AM |
494 | . {* A symbol which points at this section only *} |
495 | . struct symbol_cache_entry *symbol; | |
496 | . struct symbol_cache_entry **symbol_ptr_ptr; | |
252b5132 | 497 | . |
52b219b5 AM |
498 | . struct bfd_link_order *link_order_head; |
499 | . struct bfd_link_order *link_order_tail; | |
252b5132 RH |
500 | .} asection ; |
501 | . | |
52b219b5 AM |
502 | .{* These sections are global, and are managed by BFD. The application |
503 | . and target back end are not permitted to change the values in | |
504 | . these sections. New code should use the section_ptr macros rather | |
505 | . than referring directly to the const sections. The const sections | |
506 | . may eventually vanish. *} | |
252b5132 RH |
507 | .#define BFD_ABS_SECTION_NAME "*ABS*" |
508 | .#define BFD_UND_SECTION_NAME "*UND*" | |
509 | .#define BFD_COM_SECTION_NAME "*COM*" | |
510 | .#define BFD_IND_SECTION_NAME "*IND*" | |
511 | . | |
52b219b5 | 512 | .{* the absolute section *} |
252b5132 RH |
513 | .extern const asection bfd_abs_section; |
514 | .#define bfd_abs_section_ptr ((asection *) &bfd_abs_section) | |
515 | .#define bfd_is_abs_section(sec) ((sec) == bfd_abs_section_ptr) | |
52b219b5 | 516 | .{* Pointer to the undefined section *} |
252b5132 RH |
517 | .extern const asection bfd_und_section; |
518 | .#define bfd_und_section_ptr ((asection *) &bfd_und_section) | |
519 | .#define bfd_is_und_section(sec) ((sec) == bfd_und_section_ptr) | |
52b219b5 | 520 | .{* Pointer to the common section *} |
252b5132 RH |
521 | .extern const asection bfd_com_section; |
522 | .#define bfd_com_section_ptr ((asection *) &bfd_com_section) | |
52b219b5 | 523 | .{* Pointer to the indirect section *} |
252b5132 RH |
524 | .extern const asection bfd_ind_section; |
525 | .#define bfd_ind_section_ptr ((asection *) &bfd_ind_section) | |
526 | .#define bfd_is_ind_section(sec) ((sec) == bfd_ind_section_ptr) | |
527 | . | |
528 | .extern const struct symbol_cache_entry * const bfd_abs_symbol; | |
529 | .extern const struct symbol_cache_entry * const bfd_com_symbol; | |
530 | .extern const struct symbol_cache_entry * const bfd_und_symbol; | |
531 | .extern const struct symbol_cache_entry * const bfd_ind_symbol; | |
532 | .#define bfd_get_section_size_before_reloc(section) \ | |
f6af82bd AM |
533 | . ((section)->reloc_done ? (abort (), (bfd_size_type) 1) \ |
534 | . : (section)->_raw_size) | |
252b5132 | 535 | .#define bfd_get_section_size_after_reloc(section) \ |
f6af82bd AM |
536 | . ((section)->reloc_done ? (section)->_cooked_size \ |
537 | . : (abort (), (bfd_size_type) 1)) | |
252b5132 RH |
538 | */ |
539 | ||
22bc497d ILT |
540 | /* We use a macro to initialize the static asymbol structures because |
541 | traditional C does not permit us to initialize a union member while | |
542 | gcc warns if we don't initialize it. */ | |
543 | /* the_bfd, name, value, attr, section [, udata] */ | |
544 | #ifdef __STDC__ | |
545 | #define GLOBAL_SYM_INIT(NAME, SECTION) \ | |
546 | { 0, NAME, 0, BSF_SECTION_SYM, (asection *) SECTION, { 0 }} | |
547 | #else | |
548 | #define GLOBAL_SYM_INIT(NAME, SECTION) \ | |
549 | { 0, NAME, 0, BSF_SECTION_SYM, (asection *) SECTION } | |
550 | #endif | |
551 | ||
252b5132 RH |
552 | /* These symbols are global, not specific to any BFD. Therefore, anything |
553 | that tries to change them is broken, and should be repaired. */ | |
22bc497d | 554 | |
252b5132 RH |
555 | static const asymbol global_syms[] = |
556 | { | |
22bc497d ILT |
557 | GLOBAL_SYM_INIT (BFD_COM_SECTION_NAME, &bfd_com_section), |
558 | GLOBAL_SYM_INIT (BFD_UND_SECTION_NAME, &bfd_und_section), | |
559 | GLOBAL_SYM_INIT (BFD_ABS_SECTION_NAME, &bfd_abs_section), | |
560 | GLOBAL_SYM_INIT (BFD_IND_SECTION_NAME, &bfd_ind_section) | |
252b5132 RH |
561 | }; |
562 | ||
bc67d8a6 NC |
563 | #define STD_SECTION(SEC, FLAGS, SYM, NAME, IDX) \ |
564 | const asymbol * const SYM = (asymbol *) &global_syms[IDX]; \ | |
565 | const asection SEC = \ | |
3df7b4e2 AM |
566 | /* name, id, index, next, flags, user_set_vma, reloc_done, */ \ |
567 | { NAME, IDX, 0, NULL, FLAGS, 0, 0, \ | |
52b219b5 | 568 | \ |
bc67d8a6 NC |
569 | /* linker_mark, gc_mark, segment_mark, vma, lma, _cooked_size, */ \ |
570 | 0, 0, 0, 0, 0, 0, \ | |
52b219b5 | 571 | \ |
bc67d8a6 NC |
572 | /* _raw_size, output_offset, output_section, alignment_power, */ \ |
573 | 0, 0, (struct sec *) &SEC, 0, \ | |
52b219b5 AM |
574 | \ |
575 | /* relocation, orelocation, reloc_count, filepos, rel_filepos, */ \ | |
576 | NULL, NULL, 0, 0, 0, \ | |
577 | \ | |
578 | /* line_filepos, userdata, contents, lineno, lineno_count, */ \ | |
579 | 0, NULL, NULL, NULL, 0, \ | |
580 | \ | |
581 | /* comdat, moving_line_filepos, target_index, used_by_bfd, */ \ | |
582 | NULL, 0, 0, NULL, \ | |
583 | \ | |
584 | /* constructor_chain, owner, */ \ | |
585 | NULL, NULL, \ | |
586 | \ | |
587 | /* symbol, */ \ | |
588 | (struct symbol_cache_entry *) &global_syms[IDX], \ | |
589 | \ | |
590 | /* symbol_ptr_ptr, */ \ | |
591 | (struct symbol_cache_entry **) &SYM, \ | |
592 | \ | |
593 | /* link_order_head, link_order_tail */ \ | |
594 | NULL, NULL \ | |
022a5af4 | 595 | } |
252b5132 RH |
596 | |
597 | STD_SECTION (bfd_com_section, SEC_IS_COMMON, bfd_com_symbol, | |
598 | BFD_COM_SECTION_NAME, 0); | |
599 | STD_SECTION (bfd_und_section, 0, bfd_und_symbol, BFD_UND_SECTION_NAME, 1); | |
600 | STD_SECTION (bfd_abs_section, 0, bfd_abs_symbol, BFD_ABS_SECTION_NAME, 2); | |
601 | STD_SECTION (bfd_ind_section, 0, bfd_ind_symbol, BFD_IND_SECTION_NAME, 3); | |
602 | #undef STD_SECTION | |
603 | ||
604 | /* | |
605 | DOCDD | |
606 | INODE | |
607 | section prototypes, , typedef asection, Sections | |
608 | SUBSECTION | |
609 | Section prototypes | |
610 | ||
611 | These are the functions exported by the section handling part of BFD. | |
612 | */ | |
613 | ||
614 | /* | |
615 | FUNCTION | |
616 | bfd_get_section_by_name | |
617 | ||
618 | SYNOPSIS | |
52b219b5 | 619 | asection *bfd_get_section_by_name(bfd *abfd, const char *name); |
252b5132 RH |
620 | |
621 | DESCRIPTION | |
622 | Run through @var{abfd} and return the one of the | |
623 | <<asection>>s whose name matches @var{name}, otherwise <<NULL>>. | |
624 | @xref{Sections}, for more information. | |
625 | ||
626 | This should only be used in special cases; the normal way to process | |
627 | all sections of a given name is to use <<bfd_map_over_sections>> and | |
628 | <<strcmp>> on the name (or better yet, base it on the section flags | |
629 | or something else) for each section. | |
630 | */ | |
631 | ||
632 | asection * | |
633 | bfd_get_section_by_name (abfd, name) | |
634 | bfd *abfd; | |
52b219b5 | 635 | const char *name; |
252b5132 RH |
636 | { |
637 | asection *sect; | |
638 | ||
639 | for (sect = abfd->sections; sect != NULL; sect = sect->next) | |
640 | if (!strcmp (sect->name, name)) | |
641 | return sect; | |
642 | return NULL; | |
643 | } | |
644 | ||
645 | ||
1bd91689 AM |
646 | /* |
647 | FUNCTION | |
648 | bfd_get_unique_section_name | |
649 | ||
650 | SYNOPSIS | |
651 | char *bfd_get_unique_section_name(bfd *abfd, | |
a966dba9 | 652 | const char *templat, |
1bd91689 AM |
653 | int *count); |
654 | ||
655 | DESCRIPTION | |
656 | Invent a section name that is unique in @var{abfd} by tacking | |
77cb06e9 AM |
657 | a dot and a digit suffix onto the original @var{templat}. If |
658 | @var{count} is non-NULL, then it specifies the first number | |
659 | tried as a suffix to generate a unique name. The value | |
660 | pointed to by @var{count} will be incremented in this case. | |
1bd91689 AM |
661 | */ |
662 | ||
663 | char * | |
a966dba9 | 664 | bfd_get_unique_section_name (abfd, templat, count) |
1bd91689 | 665 | bfd *abfd; |
a966dba9 | 666 | const char *templat; |
1bd91689 AM |
667 | int *count; |
668 | { | |
669 | int num; | |
670 | unsigned int len; | |
671 | char *sname; | |
672 | ||
a966dba9 | 673 | len = strlen (templat); |
77cb06e9 | 674 | sname = bfd_malloc (len + 8); |
b3ea3584 AM |
675 | if (sname == NULL) |
676 | return NULL; | |
a966dba9 | 677 | strcpy (sname, templat); |
1bd91689 AM |
678 | num = 1; |
679 | if (count != NULL) | |
680 | num = *count; | |
681 | ||
682 | do | |
683 | { | |
684 | /* If we have a million sections, something is badly wrong. */ | |
685 | if (num > 999999) | |
686 | abort (); | |
77cb06e9 | 687 | sprintf (sname + len, ".%d", num++); |
1bd91689 AM |
688 | } |
689 | while (bfd_get_section_by_name (abfd, sname) != NULL); | |
690 | ||
691 | if (count != NULL) | |
692 | *count = num; | |
693 | return sname; | |
694 | } | |
695 | ||
696 | ||
252b5132 RH |
697 | /* |
698 | FUNCTION | |
699 | bfd_make_section_old_way | |
700 | ||
701 | SYNOPSIS | |
52b219b5 | 702 | asection *bfd_make_section_old_way(bfd *abfd, const char *name); |
252b5132 RH |
703 | |
704 | DESCRIPTION | |
705 | Create a new empty section called @var{name} | |
706 | and attach it to the end of the chain of sections for the | |
707 | BFD @var{abfd}. An attempt to create a section with a name which | |
708 | is already in use returns its pointer without changing the | |
709 | section chain. | |
710 | ||
711 | It has the funny name since this is the way it used to be | |
712 | before it was rewritten.... | |
713 | ||
714 | Possible errors are: | |
715 | o <<bfd_error_invalid_operation>> - | |
716 | If output has already started for this BFD. | |
717 | o <<bfd_error_no_memory>> - | |
718 | If memory allocation fails. | |
719 | ||
720 | */ | |
721 | ||
722 | ||
723 | asection * | |
724 | bfd_make_section_old_way (abfd, name) | |
725 | bfd *abfd; | |
52b219b5 | 726 | const char *name; |
252b5132 RH |
727 | { |
728 | asection *sec = bfd_get_section_by_name (abfd, name); | |
729 | if (sec == (asection *) NULL) | |
730 | { | |
731 | sec = bfd_make_section (abfd, name); | |
732 | } | |
733 | return sec; | |
734 | } | |
735 | ||
736 | /* | |
737 | FUNCTION | |
738 | bfd_make_section_anyway | |
739 | ||
740 | SYNOPSIS | |
52b219b5 | 741 | asection *bfd_make_section_anyway(bfd *abfd, const char *name); |
252b5132 RH |
742 | |
743 | DESCRIPTION | |
744 | Create a new empty section called @var{name} and attach it to the end of | |
745 | the chain of sections for @var{abfd}. Create a new section even if there | |
746 | is already a section with that name. | |
747 | ||
748 | Return <<NULL>> and set <<bfd_error>> on error; possible errors are: | |
749 | o <<bfd_error_invalid_operation>> - If output has already started for @var{abfd}. | |
750 | o <<bfd_error_no_memory>> - If memory allocation fails. | |
751 | */ | |
752 | ||
753 | sec_ptr | |
754 | bfd_make_section_anyway (abfd, name) | |
755 | bfd *abfd; | |
52b219b5 | 756 | const char *name; |
252b5132 | 757 | { |
3df7b4e2 | 758 | static int section_id = 0x10; /* id 0 to 3 used by STD_SECTION. */ |
252b5132 RH |
759 | asection *newsect; |
760 | asection **prev = &abfd->sections; | |
761 | asection *sect = abfd->sections; | |
762 | ||
763 | if (abfd->output_has_begun) | |
764 | { | |
765 | bfd_set_error (bfd_error_invalid_operation); | |
766 | return NULL; | |
767 | } | |
768 | ||
769 | while (sect) | |
770 | { | |
771 | prev = §->next; | |
772 | sect = sect->next; | |
773 | } | |
774 | ||
775 | newsect = (asection *) bfd_zalloc (abfd, sizeof (asection)); | |
776 | if (newsect == NULL) | |
777 | return NULL; | |
778 | ||
779 | newsect->name = name; | |
52b219b5 | 780 | newsect->id = section_id++; |
252b5132 RH |
781 | newsect->index = abfd->section_count++; |
782 | newsect->flags = SEC_NO_FLAGS; | |
783 | ||
784 | newsect->userdata = NULL; | |
785 | newsect->contents = NULL; | |
786 | newsect->next = (asection *) NULL; | |
787 | newsect->relocation = (arelent *) NULL; | |
788 | newsect->reloc_count = 0; | |
789 | newsect->line_filepos = 0; | |
790 | newsect->owner = abfd; | |
022a5af4 | 791 | newsect->comdat = NULL; |
252b5132 RH |
792 | |
793 | /* Create a symbol whos only job is to point to this section. This is | |
794 | useful for things like relocs which are relative to the base of a | |
795 | section. */ | |
796 | newsect->symbol = bfd_make_empty_symbol (abfd); | |
797 | if (newsect->symbol == NULL) | |
798 | return NULL; | |
799 | newsect->symbol->name = name; | |
800 | newsect->symbol->value = 0; | |
801 | newsect->symbol->section = newsect; | |
802 | newsect->symbol->flags = BSF_SECTION_SYM; | |
803 | ||
804 | newsect->symbol_ptr_ptr = &newsect->symbol; | |
805 | ||
806 | if (BFD_SEND (abfd, _new_section_hook, (abfd, newsect)) != true) | |
807 | { | |
808 | free (newsect); | |
809 | return NULL; | |
810 | } | |
811 | ||
812 | *prev = newsect; | |
813 | return newsect; | |
814 | } | |
815 | ||
816 | /* | |
817 | FUNCTION | |
818 | bfd_make_section | |
819 | ||
820 | SYNOPSIS | |
52b219b5 | 821 | asection *bfd_make_section(bfd *, const char *name); |
252b5132 RH |
822 | |
823 | DESCRIPTION | |
824 | Like <<bfd_make_section_anyway>>, but return <<NULL>> (without calling | |
825 | bfd_set_error ()) without changing the section chain if there is already a | |
826 | section named @var{name}. If there is an error, return <<NULL>> and set | |
827 | <<bfd_error>>. | |
828 | */ | |
829 | ||
830 | asection * | |
831 | bfd_make_section (abfd, name) | |
832 | bfd *abfd; | |
52b219b5 | 833 | const char *name; |
252b5132 RH |
834 | { |
835 | asection *sect = abfd->sections; | |
836 | ||
837 | if (strcmp (name, BFD_ABS_SECTION_NAME) == 0) | |
838 | { | |
839 | return bfd_abs_section_ptr; | |
840 | } | |
841 | if (strcmp (name, BFD_COM_SECTION_NAME) == 0) | |
842 | { | |
843 | return bfd_com_section_ptr; | |
844 | } | |
845 | if (strcmp (name, BFD_UND_SECTION_NAME) == 0) | |
846 | { | |
847 | return bfd_und_section_ptr; | |
848 | } | |
849 | ||
850 | if (strcmp (name, BFD_IND_SECTION_NAME) == 0) | |
851 | { | |
852 | return bfd_ind_section_ptr; | |
853 | } | |
854 | ||
855 | while (sect) | |
856 | { | |
857 | if (!strcmp (sect->name, name)) | |
858 | return NULL; | |
859 | sect = sect->next; | |
860 | } | |
861 | ||
862 | /* The name is not already used; go ahead and make a new section. */ | |
863 | return bfd_make_section_anyway (abfd, name); | |
864 | } | |
865 | ||
866 | ||
867 | /* | |
868 | FUNCTION | |
869 | bfd_set_section_flags | |
870 | ||
871 | SYNOPSIS | |
872 | boolean bfd_set_section_flags(bfd *abfd, asection *sec, flagword flags); | |
873 | ||
874 | DESCRIPTION | |
875 | Set the attributes of the section @var{sec} in the BFD | |
876 | @var{abfd} to the value @var{flags}. Return <<true>> on success, | |
877 | <<false>> on error. Possible error returns are: | |
878 | ||
879 | o <<bfd_error_invalid_operation>> - | |
880 | The section cannot have one or more of the attributes | |
881 | requested. For example, a .bss section in <<a.out>> may not | |
882 | have the <<SEC_HAS_CONTENTS>> field set. | |
883 | ||
884 | */ | |
885 | ||
886 | /*ARGSUSED*/ | |
887 | boolean | |
888 | bfd_set_section_flags (abfd, section, flags) | |
7442e600 | 889 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
890 | sec_ptr section; |
891 | flagword flags; | |
892 | { | |
893 | #if 0 | |
894 | /* If you try to copy a text section from an input file (where it | |
895 | has the SEC_CODE flag set) to an output file, this loses big if | |
896 | the bfd_applicable_section_flags (abfd) doesn't have the SEC_CODE | |
897 | set - which it doesn't, at least not for a.out. FIXME */ | |
898 | ||
899 | if ((flags & bfd_applicable_section_flags (abfd)) != flags) | |
900 | { | |
901 | bfd_set_error (bfd_error_invalid_operation); | |
902 | return false; | |
903 | } | |
904 | #endif | |
905 | ||
906 | section->flags = flags; | |
907 | return true; | |
908 | } | |
909 | ||
910 | ||
911 | /* | |
912 | FUNCTION | |
913 | bfd_map_over_sections | |
914 | ||
915 | SYNOPSIS | |
916 | void bfd_map_over_sections(bfd *abfd, | |
917 | void (*func)(bfd *abfd, | |
918 | asection *sect, | |
919 | PTR obj), | |
920 | PTR obj); | |
921 | ||
922 | DESCRIPTION | |
923 | Call the provided function @var{func} for each section | |
924 | attached to the BFD @var{abfd}, passing @var{obj} as an | |
925 | argument. The function will be called as if by | |
926 | ||
927 | | func(abfd, the_section, obj); | |
928 | ||
929 | This is the prefered method for iterating over sections; an | |
930 | alternative would be to use a loop: | |
931 | ||
932 | | section *p; | |
933 | | for (p = abfd->sections; p != NULL; p = p->next) | |
934 | | func(abfd, p, ...) | |
935 | ||
936 | ||
937 | */ | |
938 | ||
939 | /*VARARGS2*/ | |
940 | void | |
941 | bfd_map_over_sections (abfd, operation, user_storage) | |
942 | bfd *abfd; | |
943 | void (*operation) PARAMS ((bfd * abfd, asection * sect, PTR obj)); | |
944 | PTR user_storage; | |
945 | { | |
946 | asection *sect; | |
947 | unsigned int i = 0; | |
948 | ||
949 | for (sect = abfd->sections; sect != NULL; i++, sect = sect->next) | |
950 | (*operation) (abfd, sect, user_storage); | |
951 | ||
952 | if (i != abfd->section_count) /* Debugging */ | |
953 | abort (); | |
954 | } | |
955 | ||
956 | ||
957 | /* | |
958 | FUNCTION | |
959 | bfd_set_section_size | |
960 | ||
961 | SYNOPSIS | |
962 | boolean bfd_set_section_size(bfd *abfd, asection *sec, bfd_size_type val); | |
963 | ||
964 | DESCRIPTION | |
965 | Set @var{sec} to the size @var{val}. If the operation is | |
966 | ok, then <<true>> is returned, else <<false>>. | |
967 | ||
968 | Possible error returns: | |
969 | o <<bfd_error_invalid_operation>> - | |
970 | Writing has started to the BFD, so setting the size is invalid. | |
971 | ||
972 | */ | |
973 | ||
974 | boolean | |
975 | bfd_set_section_size (abfd, ptr, val) | |
976 | bfd *abfd; | |
977 | sec_ptr ptr; | |
978 | bfd_size_type val; | |
979 | { | |
980 | /* Once you've started writing to any section you cannot create or change | |
981 | the size of any others. */ | |
982 | ||
983 | if (abfd->output_has_begun) | |
984 | { | |
985 | bfd_set_error (bfd_error_invalid_operation); | |
986 | return false; | |
987 | } | |
988 | ||
989 | ptr->_cooked_size = val; | |
990 | ptr->_raw_size = val; | |
991 | ||
992 | return true; | |
993 | } | |
994 | ||
995 | /* | |
996 | FUNCTION | |
997 | bfd_set_section_contents | |
998 | ||
999 | SYNOPSIS | |
1000 | boolean bfd_set_section_contents | |
1001 | (bfd *abfd, | |
1002 | asection *section, | |
1003 | PTR data, | |
1004 | file_ptr offset, | |
1005 | bfd_size_type count); | |
1006 | ||
1007 | ||
1008 | DESCRIPTION | |
1009 | Sets the contents of the section @var{section} in BFD | |
1010 | @var{abfd} to the data starting in memory at @var{data}. The | |
1011 | data is written to the output section starting at offset | |
9a968f43 | 1012 | @var{offset} for @var{count} octets. |
252b5132 RH |
1013 | |
1014 | ||
1015 | ||
1016 | Normally <<true>> is returned, else <<false>>. Possible error | |
1017 | returns are: | |
1018 | o <<bfd_error_no_contents>> - | |
1019 | The output section does not have the <<SEC_HAS_CONTENTS>> | |
1020 | attribute, so nothing can be written to it. | |
1021 | o and some more too | |
1022 | ||
1023 | This routine is front end to the back end function | |
1024 | <<_bfd_set_section_contents>>. | |
1025 | ||
1026 | ||
1027 | */ | |
1028 | ||
1029 | #define bfd_get_section_size_now(abfd,sec) \ | |
1030 | (sec->reloc_done \ | |
1031 | ? bfd_get_section_size_after_reloc (sec) \ | |
1032 | : bfd_get_section_size_before_reloc (sec)) | |
1033 | ||
1034 | boolean | |
1035 | bfd_set_section_contents (abfd, section, location, offset, count) | |
1036 | bfd *abfd; | |
1037 | sec_ptr section; | |
1038 | PTR location; | |
1039 | file_ptr offset; | |
1040 | bfd_size_type count; | |
1041 | { | |
1042 | bfd_size_type sz; | |
1043 | ||
1044 | if (!(bfd_get_section_flags (abfd, section) & SEC_HAS_CONTENTS)) | |
1045 | { | |
1046 | bfd_set_error (bfd_error_no_contents); | |
1047 | return (false); | |
1048 | } | |
1049 | ||
1050 | if (offset < 0) | |
1051 | { | |
1052 | bad_val: | |
1053 | bfd_set_error (bfd_error_bad_value); | |
1054 | return false; | |
1055 | } | |
1056 | sz = bfd_get_section_size_now (abfd, section); | |
1057 | if ((bfd_size_type) offset > sz | |
1058 | || count > sz | |
1059 | || offset + count > sz) | |
1060 | goto bad_val; | |
1061 | ||
1062 | switch (abfd->direction) | |
1063 | { | |
1064 | case read_direction: | |
1065 | case no_direction: | |
1066 | bfd_set_error (bfd_error_invalid_operation); | |
1067 | return false; | |
1068 | ||
1069 | case write_direction: | |
1070 | break; | |
1071 | ||
1072 | case both_direction: | |
1073 | /* File is opened for update. `output_has_begun' some time ago when | |
1074 | the file was created. Do not recompute sections sizes or alignments | |
1075 | in _bfd_set_section_content. */ | |
1076 | abfd->output_has_begun = true; | |
1077 | break; | |
1078 | } | |
1079 | ||
1080 | if (BFD_SEND (abfd, _bfd_set_section_contents, | |
1081 | (abfd, section, location, offset, count))) | |
1082 | { | |
1083 | abfd->output_has_begun = true; | |
1084 | return true; | |
1085 | } | |
1086 | ||
1087 | return false; | |
1088 | } | |
1089 | ||
1090 | /* | |
1091 | FUNCTION | |
1092 | bfd_get_section_contents | |
1093 | ||
1094 | SYNOPSIS | |
1095 | boolean bfd_get_section_contents | |
1096 | (bfd *abfd, asection *section, PTR location, | |
1097 | file_ptr offset, bfd_size_type count); | |
1098 | ||
1099 | DESCRIPTION | |
1100 | Read data from @var{section} in BFD @var{abfd} | |
1101 | into memory starting at @var{location}. The data is read at an | |
1102 | offset of @var{offset} from the start of the input section, | |
1103 | and is read for @var{count} bytes. | |
1104 | ||
1105 | If the contents of a constructor with the <<SEC_CONSTRUCTOR>> | |
1106 | flag set are requested or if the section does not have the | |
1107 | <<SEC_HAS_CONTENTS>> flag set, then the @var{location} is filled | |
1108 | with zeroes. If no errors occur, <<true>> is returned, else | |
1109 | <<false>>. | |
1110 | ||
1111 | ||
1112 | ||
1113 | */ | |
1114 | boolean | |
1115 | bfd_get_section_contents (abfd, section, location, offset, count) | |
1116 | bfd *abfd; | |
1117 | sec_ptr section; | |
1118 | PTR location; | |
1119 | file_ptr offset; | |
1120 | bfd_size_type count; | |
1121 | { | |
1122 | bfd_size_type sz; | |
1123 | ||
1124 | if (section->flags & SEC_CONSTRUCTOR) | |
1125 | { | |
1126 | memset (location, 0, (unsigned) count); | |
1127 | return true; | |
1128 | } | |
1129 | ||
1130 | if (offset < 0) | |
1131 | { | |
1132 | bad_val: | |
1133 | bfd_set_error (bfd_error_bad_value); | |
1134 | return false; | |
1135 | } | |
1136 | /* Even if reloc_done is true, this function reads unrelocated | |
1137 | contents, so we want the raw size. */ | |
1138 | sz = section->_raw_size; | |
1139 | if ((bfd_size_type) offset > sz || count > sz || offset + count > sz) | |
1140 | goto bad_val; | |
1141 | ||
1142 | if (count == 0) | |
1143 | /* Don't bother. */ | |
1144 | return true; | |
1145 | ||
1146 | if ((section->flags & SEC_HAS_CONTENTS) == 0) | |
1147 | { | |
1148 | memset (location, 0, (unsigned) count); | |
1149 | return true; | |
1150 | } | |
1151 | ||
1152 | if ((section->flags & SEC_IN_MEMORY) != 0) | |
1153 | { | |
1154 | memcpy (location, section->contents + offset, (size_t) count); | |
1155 | return true; | |
1156 | } | |
1157 | ||
1158 | return BFD_SEND (abfd, _bfd_get_section_contents, | |
1159 | (abfd, section, location, offset, count)); | |
1160 | } | |
1161 | ||
1162 | /* | |
1163 | FUNCTION | |
1164 | bfd_copy_private_section_data | |
1165 | ||
1166 | SYNOPSIS | |
1167 | boolean bfd_copy_private_section_data(bfd *ibfd, asection *isec, bfd *obfd, asection *osec); | |
1168 | ||
1169 | DESCRIPTION | |
1170 | Copy private section information from @var{isec} in the BFD | |
1171 | @var{ibfd} to the section @var{osec} in the BFD @var{obfd}. | |
1172 | Return <<true>> on success, <<false>> on error. Possible error | |
1173 | returns are: | |
1174 | ||
1175 | o <<bfd_error_no_memory>> - | |
1176 | Not enough memory exists to create private data for @var{osec}. | |
1177 | ||
1178 | .#define bfd_copy_private_section_data(ibfd, isection, obfd, osection) \ | |
1179 | . BFD_SEND (obfd, _bfd_copy_private_section_data, \ | |
1180 | . (ibfd, isection, obfd, osection)) | |
1181 | */ | |
1182 | ||
1183 | /* | |
1184 | FUNCTION | |
1185 | _bfd_strip_section_from_output | |
1186 | ||
1187 | SYNOPSIS | |
1188 | void _bfd_strip_section_from_output | |
7f8d5fc9 | 1189 | (struct bfd_link_info *info, asection *section); |
252b5132 RH |
1190 | |
1191 | DESCRIPTION | |
7f8d5fc9 ILT |
1192 | Remove @var{section} from the output. If the output section |
1193 | becomes empty, remove it from the output bfd. @var{info} may | |
1194 | be NULL; if it is not, it is used to decide whether the output | |
1195 | section is empty. | |
252b5132 RH |
1196 | */ |
1197 | void | |
7f8d5fc9 ILT |
1198 | _bfd_strip_section_from_output (info, s) |
1199 | struct bfd_link_info *info; | |
252b5132 RH |
1200 | asection *s; |
1201 | { | |
1202 | asection **spp, *os; | |
1203 | struct bfd_link_order *p, *pp; | |
7f8d5fc9 | 1204 | boolean keep_os; |
252b5132 | 1205 | |
7f8d5fc9 ILT |
1206 | /* Excise the input section from the link order. |
1207 | ||
1208 | FIXME: For all calls that I can see to this function, the link | |
1209 | orders have not yet been set up. So why are we checking them? -- | |
1210 | Ian */ | |
252b5132 RH |
1211 | os = s->output_section; |
1212 | for (p = os->link_order_head, pp = NULL; p != NULL; pp = p, p = p->next) | |
1213 | if (p->type == bfd_indirect_link_order | |
1214 | && p->u.indirect.section == s) | |
1215 | { | |
252b5132 RH |
1216 | if (pp) |
1217 | pp->next = p->next; | |
1218 | else | |
1219 | os->link_order_head = p->next; | |
1220 | if (!p->next) | |
1221 | os->link_order_tail = pp; | |
9d7428a9 RH |
1222 | break; |
1223 | } | |
252b5132 | 1224 | |
7f8d5fc9 ILT |
1225 | keep_os = os->link_order_head != NULL; |
1226 | ||
1227 | if (! keep_os && info != NULL) | |
1228 | { | |
1229 | bfd *abfd; | |
1230 | for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next) | |
1231 | { | |
1232 | asection *is; | |
1233 | for (is = abfd->sections; is != NULL; is = is->next) | |
1234 | { | |
1235 | if (is != s && is->output_section == os) | |
1236 | break; | |
1237 | } | |
1238 | if (is != NULL) | |
1239 | break; | |
1240 | } | |
1241 | if (abfd != NULL) | |
1242 | keep_os = true; | |
1243 | } | |
1244 | ||
0bde07d4 | 1245 | /* If the output section is empty, remove it too. Careful about sections |
52b219b5 | 1246 | that have been discarded in the link script -- they are mapped to |
0bde07d4 | 1247 | bfd_abs_section, which has no owner. */ |
7f8d5fc9 | 1248 | if (!keep_os && os->owner != NULL) |
9d7428a9 RH |
1249 | { |
1250 | for (spp = &os->owner->sections; *spp; spp = &(*spp)->next) | |
1251 | if (*spp == os) | |
252b5132 | 1252 | { |
9d7428a9 RH |
1253 | *spp = os->next; |
1254 | os->owner->section_count--; | |
1255 | break; | |
252b5132 | 1256 | } |
9d7428a9 | 1257 | } |
252b5132 | 1258 | } |