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252b5132 | 1 | /* Object file "section" support for the BFD library. |
7898deda NC |
2 | Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, |
3 | 2000 | |
252b5132 RH |
4 | Free Software Foundation, Inc. |
5 | Written by Cygnus Support. | |
6 | ||
7 | This file is part of BFD, the Binary File Descriptor library. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 2 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program; if not, write to the Free Software | |
21 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
22 | ||
23 | /* | |
24 | SECTION | |
25 | Sections | |
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. It keeps hold of them by pointing to the first; | |
30 | each one points to the next in the list. | |
31 | ||
32 | Sections are supported in BFD in <<section.c>>. | |
33 | ||
34 | @menu | |
35 | @* Section Input:: | |
36 | @* Section Output:: | |
37 | @* typedef asection:: | |
38 | @* section prototypes:: | |
39 | @end menu | |
40 | ||
41 | INODE | |
42 | Section Input, Section Output, Sections, Sections | |
43 | SUBSECTION | |
44 | Section input | |
45 | ||
46 | When a BFD is opened for reading, the section structures are | |
47 | created and attached to the BFD. | |
48 | ||
49 | Each section has a name which describes the section in the | |
50 | outside world---for example, <<a.out>> would contain at least | |
51 | three sections, called <<.text>>, <<.data>> and <<.bss>>. | |
52 | ||
53 | Names need not be unique; for example a COFF file may have several | |
54 | sections named <<.data>>. | |
55 | ||
56 | Sometimes a BFD will contain more than the ``natural'' number of | |
57 | sections. A back end may attach other sections containing | |
58 | constructor data, or an application may add a section (using | |
59 | <<bfd_make_section>>) to the sections attached to an already open | |
60 | BFD. For example, the linker creates an extra section | |
61 | <<COMMON>> for each input file's BFD to hold information about | |
62 | common storage. | |
63 | ||
64 | The raw data is not necessarily read in when | |
65 | the section descriptor is created. Some targets may leave the | |
66 | data in place until a <<bfd_get_section_contents>> call is | |
67 | made. Other back ends may read in all the data at once. For | |
68 | example, an S-record file has to be read once to determine the | |
69 | size of the data. An IEEE-695 file doesn't contain raw data in | |
70 | sections, but data and relocation expressions intermixed, so | |
71 | the data area has to be parsed to get out the data and | |
72 | relocations. | |
73 | ||
74 | INODE | |
75 | Section Output, typedef asection, Section Input, Sections | |
76 | ||
77 | SUBSECTION | |
78 | Section output | |
79 | ||
80 | To write a new object style BFD, the various sections to be | |
81 | written have to be created. They are attached to the BFD in | |
82 | the same way as input sections; data is written to the | |
83 | sections using <<bfd_set_section_contents>>. | |
84 | ||
85 | Any program that creates or combines sections (e.g., the assembler | |
86 | and linker) must use the <<asection>> fields <<output_section>> and | |
87 | <<output_offset>> to indicate the file sections to which each | |
88 | section must be written. (If the section is being created from | |
89 | scratch, <<output_section>> should probably point to the section | |
90 | itself and <<output_offset>> should probably be zero.) | |
91 | ||
92 | The data to be written comes from input sections attached | |
93 | (via <<output_section>> pointers) to | |
94 | the output sections. The output section structure can be | |
95 | considered a filter for the input section: the output section | |
96 | determines the vma of the output data and the name, but the | |
97 | input section determines the offset into the output section of | |
98 | the data to be written. | |
99 | ||
100 | E.g., to create a section "O", starting at 0x100, 0x123 long, | |
101 | containing two subsections, "A" at offset 0x0 (i.e., at vma | |
102 | 0x100) and "B" at offset 0x20 (i.e., at vma 0x120) the <<asection>> | |
103 | structures would look like: | |
104 | ||
105 | | section name "A" | |
106 | | output_offset 0x00 | |
107 | | size 0x20 | |
108 | | output_section -----------> section name "O" | |
109 | | | vma 0x100 | |
110 | | section name "B" | size 0x123 | |
111 | | output_offset 0x20 | | |
112 | | size 0x103 | | |
113 | | output_section --------| | |
114 | ||
252b5132 RH |
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 | ||
252b5132 RH |
136 | #include "bfd.h" |
137 | #include "sysdep.h" | |
138 | #include "libbfd.h" | |
139 | #include "bfdlink.h" | |
140 | ||
141 | /* | |
142 | DOCDD | |
143 | INODE | |
144 | typedef asection, section prototypes, Section Output, Sections | |
145 | SUBSECTION | |
146 | typedef asection | |
147 | ||
148 | Here is the section structure: | |
149 | ||
150 | CODE_FRAGMENT | |
151 | . | |
52b219b5 AM |
152 | .{* This structure is used for a comdat section, as in PE. A comdat |
153 | . section is associated with a particular symbol. When the linker | |
154 | . sees a comdat section, it keeps only one of the sections with a | |
155 | . given name and associated with a given symbol. *} | |
022a5af4 ILT |
156 | . |
157 | .struct bfd_comdat_info | |
158 | .{ | |
159 | . {* The name of the symbol associated with a comdat section. *} | |
160 | . const char *name; | |
161 | . | |
162 | . {* The local symbol table index of the symbol associated with a | |
163 | . comdat section. This is only meaningful to the object file format | |
164 | . specific code; it is not an index into the list returned by | |
165 | . bfd_canonicalize_symtab. *} | |
166 | . long symbol; | |
022a5af4 ILT |
167 | .}; |
168 | . | |
252b5132 RH |
169 | .typedef struct sec |
170 | .{ | |
52b219b5 AM |
171 | . {* The name of the section; the name isn't a copy, the pointer is |
172 | . the same as that passed to bfd_make_section. *} | |
252b5132 | 173 | . |
52b219b5 AM |
174 | . const char *name; |
175 | . | |
176 | . {* A unique sequence number. *} | |
177 | . | |
178 | . int id; | |
252b5132 | 179 | . |
52b219b5 | 180 | . {* Which section is it; 0..nth. *} |
252b5132 | 181 | . |
52b219b5 | 182 | . int index; |
252b5132 | 183 | . |
52b219b5 | 184 | . {* The next section in the list belonging to the BFD, or NULL. *} |
252b5132 | 185 | . |
52b219b5 | 186 | . struct sec *next; |
252b5132 | 187 | . |
52b219b5 AM |
188 | . {* The field flags contains attributes of the section. Some |
189 | . flags are read in from the object file, and some are | |
190 | . synthesized from other information. *} | |
252b5132 | 191 | . |
52b219b5 | 192 | . flagword flags; |
252b5132 RH |
193 | . |
194 | .#define SEC_NO_FLAGS 0x000 | |
195 | . | |
52b219b5 AM |
196 | . {* Tells the OS to allocate space for this section when loading. |
197 | . This is clear for a section containing debug information only. *} | |
252b5132 RH |
198 | .#define SEC_ALLOC 0x001 |
199 | . | |
52b219b5 AM |
200 | . {* Tells the OS to load the section from the file when loading. |
201 | . This is clear for a .bss section. *} | |
252b5132 RH |
202 | .#define SEC_LOAD 0x002 |
203 | . | |
52b219b5 AM |
204 | . {* The section contains data still to be relocated, so there is |
205 | . some relocation information too. *} | |
252b5132 RH |
206 | .#define SEC_RELOC 0x004 |
207 | . | |
208 | .#if 0 {* Obsolete ? *} | |
209 | .#define SEC_BALIGN 0x008 | |
210 | .#endif | |
211 | . | |
52b219b5 | 212 | . {* A signal to the OS that the section contains read only data. *} |
252b5132 RH |
213 | .#define SEC_READONLY 0x010 |
214 | . | |
52b219b5 | 215 | . {* The section contains code only. *} |
252b5132 RH |
216 | .#define SEC_CODE 0x020 |
217 | . | |
52b219b5 | 218 | . {* The section contains data only. *} |
252b5132 RH |
219 | .#define SEC_DATA 0x040 |
220 | . | |
52b219b5 | 221 | . {* The section will reside in ROM. *} |
252b5132 RH |
222 | .#define SEC_ROM 0x080 |
223 | . | |
52b219b5 AM |
224 | . {* The section contains constructor information. This section |
225 | . type is used by the linker to create lists of constructors and | |
226 | . destructors used by <<g++>>. When a back end sees a symbol | |
227 | . which should be used in a constructor list, it creates a new | |
228 | . section for the type of name (e.g., <<__CTOR_LIST__>>), attaches | |
229 | . the symbol to it, and builds a relocation. To build the lists | |
230 | . of constructors, all the linker has to do is catenate all the | |
231 | . sections called <<__CTOR_LIST__>> and relocate the data | |
232 | . contained within - exactly the operations it would peform on | |
233 | . standard data. *} | |
252b5132 RH |
234 | .#define SEC_CONSTRUCTOR 0x100 |
235 | . | |
52b219b5 AM |
236 | . {* The section is a constructor, and should be placed at the |
237 | . end of the text, data, or bss section(?). *} | |
252b5132 RH |
238 | .#define SEC_CONSTRUCTOR_TEXT 0x1100 |
239 | .#define SEC_CONSTRUCTOR_DATA 0x2100 | |
240 | .#define SEC_CONSTRUCTOR_BSS 0x3100 | |
241 | . | |
52b219b5 AM |
242 | . {* The section has contents - a data section could be |
243 | . <<SEC_ALLOC>> | <<SEC_HAS_CONTENTS>>; a debug section could be | |
244 | . <<SEC_HAS_CONTENTS>> *} | |
252b5132 RH |
245 | .#define SEC_HAS_CONTENTS 0x200 |
246 | . | |
52b219b5 AM |
247 | . {* An instruction to the linker to not output the section |
248 | . even if it has information which would normally be written. *} | |
252b5132 RH |
249 | .#define SEC_NEVER_LOAD 0x400 |
250 | . | |
52b219b5 AM |
251 | . {* The section is a COFF shared library section. This flag is |
252 | . only for the linker. If this type of section appears in | |
253 | . the input file, the linker must copy it to the output file | |
254 | . without changing the vma or size. FIXME: Although this | |
255 | . was originally intended to be general, it really is COFF | |
256 | . specific (and the flag was renamed to indicate this). It | |
257 | . might be cleaner to have some more general mechanism to | |
258 | . allow the back end to control what the linker does with | |
259 | . sections. *} | |
252b5132 RH |
260 | .#define SEC_COFF_SHARED_LIBRARY 0x800 |
261 | . | |
1bd91689 AM |
262 | . {* The section has GOT references. This flag is only for the |
263 | . linker, and is currently only used by the elf32-hppa back end. | |
264 | . It will be set if global offset table references were detected | |
265 | . in this section, which indicate to the linker that the section | |
266 | . contains PIC code, and must be handled specially when doing a | |
267 | . static link. *} | |
268 | .#define SEC_HAS_GOT_REF 0x4000 | |
269 | . | |
52b219b5 AM |
270 | . {* The section contains common symbols (symbols may be defined |
271 | . multiple times, the value of a symbol is the amount of | |
272 | . space it requires, and the largest symbol value is the one | |
273 | . used). Most targets have exactly one of these (which we | |
274 | . translate to bfd_com_section_ptr), but ECOFF has two. *} | |
252b5132 RH |
275 | .#define SEC_IS_COMMON 0x8000 |
276 | . | |
52b219b5 AM |
277 | . {* The section contains only debugging information. For |
278 | . example, this is set for ELF .debug and .stab sections. | |
279 | . strip tests this flag to see if a section can be | |
280 | . discarded. *} | |
252b5132 RH |
281 | .#define SEC_DEBUGGING 0x10000 |
282 | . | |
52b219b5 AM |
283 | . {* The contents of this section are held in memory pointed to |
284 | . by the contents field. This is checked by bfd_get_section_contents, | |
285 | . and the data is retrieved from memory if appropriate. *} | |
252b5132 RH |
286 | .#define SEC_IN_MEMORY 0x20000 |
287 | . | |
52b219b5 AM |
288 | . {* The contents of this section are to be excluded by the |
289 | . linker for executable and shared objects unless those | |
290 | . objects are to be further relocated. *} | |
252b5132 RH |
291 | .#define SEC_EXCLUDE 0x40000 |
292 | . | |
52b219b5 AM |
293 | . {* The contents of this section are to be sorted by the |
294 | . based on the address specified in the associated symbol | |
295 | . table. *} | |
252b5132 RH |
296 | .#define SEC_SORT_ENTRIES 0x80000 |
297 | . | |
52b219b5 AM |
298 | . {* When linking, duplicate sections of the same name should be |
299 | . discarded, rather than being combined into a single section as | |
300 | . is usually done. This is similar to how common symbols are | |
301 | . handled. See SEC_LINK_DUPLICATES below. *} | |
252b5132 RH |
302 | .#define SEC_LINK_ONCE 0x100000 |
303 | . | |
52b219b5 AM |
304 | . {* If SEC_LINK_ONCE is set, this bitfield describes how the linker |
305 | . should handle duplicate sections. *} | |
252b5132 RH |
306 | .#define SEC_LINK_DUPLICATES 0x600000 |
307 | . | |
52b219b5 AM |
308 | . {* This value for SEC_LINK_DUPLICATES means that duplicate |
309 | . sections with the same name should simply be discarded. *} | |
252b5132 RH |
310 | .#define SEC_LINK_DUPLICATES_DISCARD 0x0 |
311 | . | |
52b219b5 AM |
312 | . {* This value for SEC_LINK_DUPLICATES means that the linker |
313 | . should warn if there are any duplicate sections, although | |
314 | . it should still only link one copy. *} | |
252b5132 RH |
315 | .#define SEC_LINK_DUPLICATES_ONE_ONLY 0x200000 |
316 | . | |
52b219b5 AM |
317 | . {* This value for SEC_LINK_DUPLICATES means that the linker |
318 | . should warn if any duplicate sections are a different size. *} | |
252b5132 RH |
319 | .#define SEC_LINK_DUPLICATES_SAME_SIZE 0x400000 |
320 | . | |
52b219b5 AM |
321 | . {* This value for SEC_LINK_DUPLICATES means that the linker |
322 | . should warn if any duplicate sections contain different | |
323 | . contents. *} | |
252b5132 RH |
324 | .#define SEC_LINK_DUPLICATES_SAME_CONTENTS 0x600000 |
325 | . | |
52b219b5 AM |
326 | . {* This section was created by the linker as part of dynamic |
327 | . relocation or other arcane processing. It is skipped when | |
328 | . going through the first-pass output, trusting that someone | |
329 | . else up the line will take care of it later. *} | |
252b5132 RH |
330 | .#define SEC_LINKER_CREATED 0x800000 |
331 | . | |
52b219b5 | 332 | . {* This section should not be subject to garbage collection. *} |
252b5132 RH |
333 | .#define SEC_KEEP 0x1000000 |
334 | . | |
52b219b5 AM |
335 | . {* This section contains "short" data, and should be placed |
336 | . "near" the GP. *} | |
851edbaf | 337 | .#define SEC_SMALL_DATA 0x2000000 |
0c3ff40b | 338 | . |
52b219b5 AM |
339 | . {* This section contains data which may be shared with other |
340 | . executables or shared objects. *} | |
bd826630 ILT |
341 | .#define SEC_SHARED 0x4000000 |
342 | . | |
52b219b5 AM |
343 | . {* When a section with this flag is being linked, then if the size of |
344 | . the input section is less than a page, it should not cross a page | |
345 | . boundary. If the size of the input section is one page or more, it | |
346 | . should be aligned on a page boundary. *} | |
34cbe64e TW |
347 | .#define SEC_BLOCK 0x8000000 |
348 | . | |
52b219b5 AM |
349 | . {* Conditionally link this section; do not link if there are no |
350 | . references found to any symbol in the section. *} | |
34cbe64e TW |
351 | .#define SEC_CLINK 0x10000000 |
352 | . | |
2dd439c5 L |
353 | . {* Attempt to merge identical entities in the section. |
354 | . Entity size is given in the entsize field. *} | |
355 | .#define SEC_MERGE 0x20000000 | |
356 | . | |
357 | . {* If given with SEC_MERGE, entities to merge are zero terminated | |
358 | . strings where entsize specifies character size instead of fixed | |
359 | . size entries. *} | |
360 | .#define SEC_STRINGS 0x40000000 | |
361 | . | |
52b219b5 | 362 | . {* End of section flags. *} |
252b5132 | 363 | . |
52b219b5 | 364 | . {* Some internal packed boolean fields. *} |
252b5132 | 365 | . |
52b219b5 AM |
366 | . {* See the vma field. *} |
367 | . unsigned int user_set_vma : 1; | |
252b5132 | 368 | . |
52b219b5 AM |
369 | . {* Whether relocations have been processed. *} |
370 | . unsigned int reloc_done : 1; | |
252b5132 | 371 | . |
52b219b5 AM |
372 | . {* A mark flag used by some of the linker backends. *} |
373 | . unsigned int linker_mark : 1; | |
252b5132 | 374 | . |
52b219b5 AM |
375 | . {* A mark flag used by some linker backends for garbage collection. *} |
376 | . unsigned int gc_mark : 1; | |
252b5132 | 377 | . |
bc67d8a6 NC |
378 | . {* Used by the ELF code to mark sections which have been allocated to segments. *} |
379 | . unsigned int segment_mark : 1; | |
380 | . | |
52b219b5 | 381 | . {* End of internal packed boolean fields. *} |
252b5132 | 382 | . |
52b219b5 AM |
383 | . {* The virtual memory address of the section - where it will be |
384 | . at run time. The symbols are relocated against this. The | |
385 | . user_set_vma flag is maintained by bfd; if it's not set, the | |
386 | . backend can assign addresses (for example, in <<a.out>>, where | |
387 | . the default address for <<.data>> is dependent on the specific | |
388 | . target and various flags). *} | |
252b5132 | 389 | . |
52b219b5 | 390 | . bfd_vma vma; |
252b5132 | 391 | . |
52b219b5 AM |
392 | . {* The load address of the section - where it would be in a |
393 | . rom image; really only used for writing section header | |
394 | . information. *} | |
252b5132 | 395 | . |
52b219b5 | 396 | . bfd_vma lma; |
252b5132 | 397 | . |
52b219b5 AM |
398 | . {* The size of the section in octets, as it will be output. |
399 | . Contains a value even if the section has no contents (e.g., the | |
400 | . size of <<.bss>>). This will be filled in after relocation. *} | |
252b5132 | 401 | . |
52b219b5 | 402 | . bfd_size_type _cooked_size; |
252b5132 | 403 | . |
52b219b5 AM |
404 | . {* The original size on disk of the section, in octets. Normally this |
405 | . value is the same as the size, but if some relaxing has | |
406 | . been done, then this value will be bigger. *} | |
252b5132 | 407 | . |
52b219b5 | 408 | . bfd_size_type _raw_size; |
252b5132 | 409 | . |
52b219b5 AM |
410 | . {* If this section is going to be output, then this value is the |
411 | . offset in *bytes* into the output section of the first byte in the | |
412 | . input section (byte ==> smallest addressable unit on the | |
413 | . target). In most cases, if this was going to start at the | |
414 | . 100th octet (8-bit quantity) in the output section, this value | |
415 | . would be 100. However, if the target byte size is 16 bits | |
416 | . (bfd_octets_per_byte is "2"), this value would be 50. *} | |
252b5132 | 417 | . |
52b219b5 | 418 | . bfd_vma output_offset; |
252b5132 | 419 | . |
52b219b5 | 420 | . {* The output section through which to map on output. *} |
252b5132 | 421 | . |
52b219b5 | 422 | . struct sec *output_section; |
252b5132 | 423 | . |
52b219b5 AM |
424 | . {* The alignment requirement of the section, as an exponent of 2 - |
425 | . e.g., 3 aligns to 2^3 (or 8). *} | |
252b5132 | 426 | . |
52b219b5 | 427 | . unsigned int alignment_power; |
252b5132 | 428 | . |
52b219b5 AM |
429 | . {* If an input section, a pointer to a vector of relocation |
430 | . records for the data in this section. *} | |
252b5132 | 431 | . |
52b219b5 | 432 | . struct reloc_cache_entry *relocation; |
252b5132 | 433 | . |
52b219b5 AM |
434 | . {* If an output section, a pointer to a vector of pointers to |
435 | . relocation records for the data in this section. *} | |
252b5132 | 436 | . |
52b219b5 | 437 | . struct reloc_cache_entry **orelocation; |
252b5132 | 438 | . |
52b219b5 | 439 | . {* The number of relocation records in one of the above *} |
252b5132 | 440 | . |
52b219b5 | 441 | . unsigned reloc_count; |
252b5132 | 442 | . |
52b219b5 AM |
443 | . {* Information below is back end specific - and not always used |
444 | . or updated. *} | |
252b5132 | 445 | . |
52b219b5 | 446 | . {* File position of section data. *} |
252b5132 | 447 | . |
52b219b5 | 448 | . file_ptr filepos; |
252b5132 | 449 | . |
52b219b5 | 450 | . {* File position of relocation info. *} |
252b5132 | 451 | . |
52b219b5 | 452 | . file_ptr rel_filepos; |
252b5132 | 453 | . |
52b219b5 | 454 | . {* File position of line data. *} |
252b5132 | 455 | . |
52b219b5 | 456 | . file_ptr line_filepos; |
252b5132 | 457 | . |
52b219b5 | 458 | . {* Pointer to data for applications. *} |
252b5132 | 459 | . |
52b219b5 | 460 | . PTR userdata; |
252b5132 | 461 | . |
52b219b5 AM |
462 | . {* If the SEC_IN_MEMORY flag is set, this points to the actual |
463 | . contents. *} | |
464 | . unsigned char *contents; | |
252b5132 | 465 | . |
52b219b5 | 466 | . {* Attached line number information. *} |
252b5132 | 467 | . |
52b219b5 | 468 | . alent *lineno; |
252b5132 | 469 | . |
52b219b5 | 470 | . {* Number of line number records. *} |
252b5132 | 471 | . |
52b219b5 | 472 | . unsigned int lineno_count; |
252b5132 | 473 | . |
2dd439c5 L |
474 | . {* Entity size for merging purposes. *} |
475 | . | |
476 | . unsigned int entsize; | |
477 | . | |
52b219b5 | 478 | . {* Optional information about a COMDAT entry; NULL if not COMDAT. *} |
022a5af4 | 479 | . |
52b219b5 | 480 | . struct bfd_comdat_info *comdat; |
022a5af4 | 481 | . |
24376d1b AM |
482 | . {* Points to the kept section if this section is a link-once section, |
483 | . and is discarded. *} | |
484 | . struct sec *kept_section; | |
485 | . | |
52b219b5 AM |
486 | . {* When a section is being output, this value changes as more |
487 | . linenumbers are written out. *} | |
252b5132 | 488 | . |
52b219b5 | 489 | . file_ptr moving_line_filepos; |
252b5132 | 490 | . |
52b219b5 | 491 | . {* What the section number is in the target world. *} |
252b5132 | 492 | . |
52b219b5 | 493 | . int target_index; |
252b5132 | 494 | . |
52b219b5 | 495 | . PTR used_by_bfd; |
252b5132 | 496 | . |
52b219b5 AM |
497 | . {* If this is a constructor section then here is a list of the |
498 | . relocations created to relocate items within it. *} | |
252b5132 | 499 | . |
52b219b5 | 500 | . struct relent_chain *constructor_chain; |
252b5132 | 501 | . |
52b219b5 | 502 | . {* The BFD which owns the section. *} |
252b5132 | 503 | . |
52b219b5 | 504 | . bfd *owner; |
252b5132 | 505 | . |
52b219b5 AM |
506 | . {* A symbol which points at this section only *} |
507 | . struct symbol_cache_entry *symbol; | |
508 | . struct symbol_cache_entry **symbol_ptr_ptr; | |
252b5132 | 509 | . |
52b219b5 AM |
510 | . struct bfd_link_order *link_order_head; |
511 | . struct bfd_link_order *link_order_tail; | |
252b5132 RH |
512 | .} asection ; |
513 | . | |
52b219b5 AM |
514 | .{* These sections are global, and are managed by BFD. The application |
515 | . and target back end are not permitted to change the values in | |
516 | . these sections. New code should use the section_ptr macros rather | |
517 | . than referring directly to the const sections. The const sections | |
518 | . may eventually vanish. *} | |
252b5132 RH |
519 | .#define BFD_ABS_SECTION_NAME "*ABS*" |
520 | .#define BFD_UND_SECTION_NAME "*UND*" | |
521 | .#define BFD_COM_SECTION_NAME "*COM*" | |
522 | .#define BFD_IND_SECTION_NAME "*IND*" | |
523 | . | |
52b219b5 | 524 | .{* the absolute section *} |
252b5132 RH |
525 | .extern const asection bfd_abs_section; |
526 | .#define bfd_abs_section_ptr ((asection *) &bfd_abs_section) | |
527 | .#define bfd_is_abs_section(sec) ((sec) == bfd_abs_section_ptr) | |
52b219b5 | 528 | .{* Pointer to the undefined section *} |
252b5132 RH |
529 | .extern const asection bfd_und_section; |
530 | .#define bfd_und_section_ptr ((asection *) &bfd_und_section) | |
531 | .#define bfd_is_und_section(sec) ((sec) == bfd_und_section_ptr) | |
52b219b5 | 532 | .{* Pointer to the common section *} |
252b5132 RH |
533 | .extern const asection bfd_com_section; |
534 | .#define bfd_com_section_ptr ((asection *) &bfd_com_section) | |
52b219b5 | 535 | .{* Pointer to the indirect section *} |
252b5132 RH |
536 | .extern const asection bfd_ind_section; |
537 | .#define bfd_ind_section_ptr ((asection *) &bfd_ind_section) | |
538 | .#define bfd_is_ind_section(sec) ((sec) == bfd_ind_section_ptr) | |
539 | . | |
540 | .extern const struct symbol_cache_entry * const bfd_abs_symbol; | |
541 | .extern const struct symbol_cache_entry * const bfd_com_symbol; | |
542 | .extern const struct symbol_cache_entry * const bfd_und_symbol; | |
543 | .extern const struct symbol_cache_entry * const bfd_ind_symbol; | |
544 | .#define bfd_get_section_size_before_reloc(section) \ | |
f6af82bd AM |
545 | . ((section)->reloc_done ? (abort (), (bfd_size_type) 1) \ |
546 | . : (section)->_raw_size) | |
252b5132 | 547 | .#define bfd_get_section_size_after_reloc(section) \ |
f6af82bd AM |
548 | . ((section)->reloc_done ? (section)->_cooked_size \ |
549 | . : (abort (), (bfd_size_type) 1)) | |
252b5132 RH |
550 | */ |
551 | ||
22bc497d ILT |
552 | /* We use a macro to initialize the static asymbol structures because |
553 | traditional C does not permit us to initialize a union member while | |
554 | gcc warns if we don't initialize it. */ | |
555 | /* the_bfd, name, value, attr, section [, udata] */ | |
556 | #ifdef __STDC__ | |
557 | #define GLOBAL_SYM_INIT(NAME, SECTION) \ | |
558 | { 0, NAME, 0, BSF_SECTION_SYM, (asection *) SECTION, { 0 }} | |
559 | #else | |
560 | #define GLOBAL_SYM_INIT(NAME, SECTION) \ | |
561 | { 0, NAME, 0, BSF_SECTION_SYM, (asection *) SECTION } | |
562 | #endif | |
563 | ||
252b5132 RH |
564 | /* These symbols are global, not specific to any BFD. Therefore, anything |
565 | that tries to change them is broken, and should be repaired. */ | |
22bc497d | 566 | |
252b5132 RH |
567 | static const asymbol global_syms[] = |
568 | { | |
22bc497d ILT |
569 | GLOBAL_SYM_INIT (BFD_COM_SECTION_NAME, &bfd_com_section), |
570 | GLOBAL_SYM_INIT (BFD_UND_SECTION_NAME, &bfd_und_section), | |
571 | GLOBAL_SYM_INIT (BFD_ABS_SECTION_NAME, &bfd_abs_section), | |
572 | GLOBAL_SYM_INIT (BFD_IND_SECTION_NAME, &bfd_ind_section) | |
252b5132 RH |
573 | }; |
574 | ||
bc67d8a6 NC |
575 | #define STD_SECTION(SEC, FLAGS, SYM, NAME, IDX) \ |
576 | const asymbol * const SYM = (asymbol *) &global_syms[IDX]; \ | |
577 | const asection SEC = \ | |
3df7b4e2 AM |
578 | /* name, id, index, next, flags, user_set_vma, reloc_done, */ \ |
579 | { NAME, IDX, 0, NULL, FLAGS, 0, 0, \ | |
52b219b5 | 580 | \ |
bc67d8a6 | 581 | /* linker_mark, gc_mark, segment_mark, vma, lma, _cooked_size, */ \ |
90460d97 | 582 | 0, 1, 0, 0, 0, 0, \ |
52b219b5 | 583 | \ |
bc67d8a6 NC |
584 | /* _raw_size, output_offset, output_section, alignment_power, */ \ |
585 | 0, 0, (struct sec *) &SEC, 0, \ | |
52b219b5 AM |
586 | \ |
587 | /* relocation, orelocation, reloc_count, filepos, rel_filepos, */ \ | |
588 | NULL, NULL, 0, 0, 0, \ | |
589 | \ | |
590 | /* line_filepos, userdata, contents, lineno, lineno_count, */ \ | |
591 | 0, NULL, NULL, NULL, 0, \ | |
592 | \ | |
24376d1b AM |
593 | /* comdat, kept_section, moving_line_filepos, target_index, */ \ |
594 | NULL, NULL, 0, 0, \ | |
52b219b5 | 595 | \ |
24376d1b AM |
596 | /* used_by_bfd, constructor_chain, owner, */ \ |
597 | NULL, NULL, NULL, \ | |
52b219b5 AM |
598 | \ |
599 | /* symbol, */ \ | |
600 | (struct symbol_cache_entry *) &global_syms[IDX], \ | |
601 | \ | |
602 | /* symbol_ptr_ptr, */ \ | |
603 | (struct symbol_cache_entry **) &SYM, \ | |
604 | \ | |
605 | /* link_order_head, link_order_tail */ \ | |
606 | NULL, NULL \ | |
022a5af4 | 607 | } |
252b5132 RH |
608 | |
609 | STD_SECTION (bfd_com_section, SEC_IS_COMMON, bfd_com_symbol, | |
610 | BFD_COM_SECTION_NAME, 0); | |
611 | STD_SECTION (bfd_und_section, 0, bfd_und_symbol, BFD_UND_SECTION_NAME, 1); | |
612 | STD_SECTION (bfd_abs_section, 0, bfd_abs_symbol, BFD_ABS_SECTION_NAME, 2); | |
613 | STD_SECTION (bfd_ind_section, 0, bfd_ind_symbol, BFD_IND_SECTION_NAME, 3); | |
614 | #undef STD_SECTION | |
615 | ||
616 | /* | |
617 | DOCDD | |
618 | INODE | |
619 | section prototypes, , typedef asection, Sections | |
620 | SUBSECTION | |
621 | Section prototypes | |
622 | ||
623 | These are the functions exported by the section handling part of BFD. | |
624 | */ | |
625 | ||
626 | /* | |
627 | FUNCTION | |
628 | bfd_get_section_by_name | |
629 | ||
630 | SYNOPSIS | |
52b219b5 | 631 | asection *bfd_get_section_by_name(bfd *abfd, const char *name); |
252b5132 RH |
632 | |
633 | DESCRIPTION | |
634 | Run through @var{abfd} and return the one of the | |
635 | <<asection>>s whose name matches @var{name}, otherwise <<NULL>>. | |
636 | @xref{Sections}, for more information. | |
637 | ||
638 | This should only be used in special cases; the normal way to process | |
639 | all sections of a given name is to use <<bfd_map_over_sections>> and | |
640 | <<strcmp>> on the name (or better yet, base it on the section flags | |
641 | or something else) for each section. | |
642 | */ | |
643 | ||
644 | asection * | |
645 | bfd_get_section_by_name (abfd, name) | |
646 | bfd *abfd; | |
52b219b5 | 647 | const char *name; |
252b5132 RH |
648 | { |
649 | asection *sect; | |
650 | ||
651 | for (sect = abfd->sections; sect != NULL; sect = sect->next) | |
652 | if (!strcmp (sect->name, name)) | |
653 | return sect; | |
654 | return NULL; | |
655 | } | |
656 | ||
1bd91689 AM |
657 | /* |
658 | FUNCTION | |
659 | bfd_get_unique_section_name | |
660 | ||
661 | SYNOPSIS | |
662 | char *bfd_get_unique_section_name(bfd *abfd, | |
a966dba9 | 663 | const char *templat, |
1bd91689 AM |
664 | int *count); |
665 | ||
666 | DESCRIPTION | |
667 | Invent a section name that is unique in @var{abfd} by tacking | |
77cb06e9 AM |
668 | a dot and a digit suffix onto the original @var{templat}. If |
669 | @var{count} is non-NULL, then it specifies the first number | |
670 | tried as a suffix to generate a unique name. The value | |
671 | pointed to by @var{count} will be incremented in this case. | |
1bd91689 AM |
672 | */ |
673 | ||
674 | char * | |
a966dba9 | 675 | bfd_get_unique_section_name (abfd, templat, count) |
1bd91689 | 676 | bfd *abfd; |
a966dba9 | 677 | const char *templat; |
1bd91689 AM |
678 | int *count; |
679 | { | |
680 | int num; | |
681 | unsigned int len; | |
682 | char *sname; | |
683 | ||
a966dba9 | 684 | len = strlen (templat); |
77cb06e9 | 685 | sname = bfd_malloc (len + 8); |
b3ea3584 AM |
686 | if (sname == NULL) |
687 | return NULL; | |
a966dba9 | 688 | strcpy (sname, templat); |
1bd91689 AM |
689 | num = 1; |
690 | if (count != NULL) | |
691 | num = *count; | |
692 | ||
693 | do | |
694 | { | |
695 | /* If we have a million sections, something is badly wrong. */ | |
696 | if (num > 999999) | |
697 | abort (); | |
77cb06e9 | 698 | sprintf (sname + len, ".%d", num++); |
1bd91689 AM |
699 | } |
700 | while (bfd_get_section_by_name (abfd, sname) != NULL); | |
701 | ||
702 | if (count != NULL) | |
703 | *count = num; | |
704 | return sname; | |
705 | } | |
706 | ||
252b5132 RH |
707 | /* |
708 | FUNCTION | |
709 | bfd_make_section_old_way | |
710 | ||
711 | SYNOPSIS | |
52b219b5 | 712 | asection *bfd_make_section_old_way(bfd *abfd, const char *name); |
252b5132 RH |
713 | |
714 | DESCRIPTION | |
715 | Create a new empty section called @var{name} | |
716 | and attach it to the end of the chain of sections for the | |
717 | BFD @var{abfd}. An attempt to create a section with a name which | |
718 | is already in use returns its pointer without changing the | |
719 | section chain. | |
720 | ||
721 | It has the funny name since this is the way it used to be | |
722 | before it was rewritten.... | |
723 | ||
724 | Possible errors are: | |
725 | o <<bfd_error_invalid_operation>> - | |
726 | If output has already started for this BFD. | |
727 | o <<bfd_error_no_memory>> - | |
728 | If memory allocation fails. | |
729 | ||
730 | */ | |
731 | ||
252b5132 RH |
732 | asection * |
733 | bfd_make_section_old_way (abfd, name) | |
734 | bfd *abfd; | |
52b219b5 | 735 | const char *name; |
252b5132 RH |
736 | { |
737 | asection *sec = bfd_get_section_by_name (abfd, name); | |
738 | if (sec == (asection *) NULL) | |
739 | { | |
740 | sec = bfd_make_section (abfd, name); | |
741 | } | |
742 | return sec; | |
743 | } | |
744 | ||
745 | /* | |
746 | FUNCTION | |
747 | bfd_make_section_anyway | |
748 | ||
749 | SYNOPSIS | |
52b219b5 | 750 | asection *bfd_make_section_anyway(bfd *abfd, const char *name); |
252b5132 RH |
751 | |
752 | DESCRIPTION | |
753 | Create a new empty section called @var{name} and attach it to the end of | |
754 | the chain of sections for @var{abfd}. Create a new section even if there | |
755 | is already a section with that name. | |
756 | ||
757 | Return <<NULL>> and set <<bfd_error>> on error; possible errors are: | |
758 | o <<bfd_error_invalid_operation>> - If output has already started for @var{abfd}. | |
759 | o <<bfd_error_no_memory>> - If memory allocation fails. | |
760 | */ | |
761 | ||
762 | sec_ptr | |
763 | bfd_make_section_anyway (abfd, name) | |
764 | bfd *abfd; | |
52b219b5 | 765 | const char *name; |
252b5132 | 766 | { |
3df7b4e2 | 767 | static int section_id = 0x10; /* id 0 to 3 used by STD_SECTION. */ |
252b5132 RH |
768 | asection *newsect; |
769 | asection **prev = &abfd->sections; | |
770 | asection *sect = abfd->sections; | |
771 | ||
772 | if (abfd->output_has_begun) | |
773 | { | |
774 | bfd_set_error (bfd_error_invalid_operation); | |
775 | return NULL; | |
776 | } | |
777 | ||
778 | while (sect) | |
779 | { | |
780 | prev = §->next; | |
781 | sect = sect->next; | |
782 | } | |
783 | ||
784 | newsect = (asection *) bfd_zalloc (abfd, sizeof (asection)); | |
785 | if (newsect == NULL) | |
786 | return NULL; | |
787 | ||
788 | newsect->name = name; | |
52b219b5 | 789 | newsect->id = section_id++; |
252b5132 RH |
790 | newsect->index = abfd->section_count++; |
791 | newsect->flags = SEC_NO_FLAGS; | |
792 | ||
793 | newsect->userdata = NULL; | |
794 | newsect->contents = NULL; | |
795 | newsect->next = (asection *) NULL; | |
796 | newsect->relocation = (arelent *) NULL; | |
797 | newsect->reloc_count = 0; | |
798 | newsect->line_filepos = 0; | |
799 | newsect->owner = abfd; | |
022a5af4 | 800 | newsect->comdat = NULL; |
24376d1b | 801 | newsect->kept_section = NULL; |
252b5132 RH |
802 | |
803 | /* Create a symbol whos only job is to point to this section. This is | |
804 | useful for things like relocs which are relative to the base of a | |
805 | section. */ | |
806 | newsect->symbol = bfd_make_empty_symbol (abfd); | |
807 | if (newsect->symbol == NULL) | |
4d7ce4dd AM |
808 | { |
809 | bfd_release (abfd, newsect); | |
810 | return NULL; | |
811 | } | |
252b5132 RH |
812 | newsect->symbol->name = name; |
813 | newsect->symbol->value = 0; | |
814 | newsect->symbol->section = newsect; | |
815 | newsect->symbol->flags = BSF_SECTION_SYM; | |
816 | ||
817 | newsect->symbol_ptr_ptr = &newsect->symbol; | |
818 | ||
819 | if (BFD_SEND (abfd, _new_section_hook, (abfd, newsect)) != true) | |
820 | { | |
4d7ce4dd | 821 | bfd_release (abfd, newsect); |
252b5132 RH |
822 | return NULL; |
823 | } | |
824 | ||
825 | *prev = newsect; | |
826 | return newsect; | |
827 | } | |
828 | ||
829 | /* | |
830 | FUNCTION | |
831 | bfd_make_section | |
832 | ||
833 | SYNOPSIS | |
52b219b5 | 834 | asection *bfd_make_section(bfd *, const char *name); |
252b5132 RH |
835 | |
836 | DESCRIPTION | |
837 | Like <<bfd_make_section_anyway>>, but return <<NULL>> (without calling | |
838 | bfd_set_error ()) without changing the section chain if there is already a | |
839 | section named @var{name}. If there is an error, return <<NULL>> and set | |
840 | <<bfd_error>>. | |
841 | */ | |
842 | ||
843 | asection * | |
844 | bfd_make_section (abfd, name) | |
845 | bfd *abfd; | |
52b219b5 | 846 | const char *name; |
252b5132 RH |
847 | { |
848 | asection *sect = abfd->sections; | |
849 | ||
850 | if (strcmp (name, BFD_ABS_SECTION_NAME) == 0) | |
851 | { | |
852 | return bfd_abs_section_ptr; | |
853 | } | |
854 | if (strcmp (name, BFD_COM_SECTION_NAME) == 0) | |
855 | { | |
856 | return bfd_com_section_ptr; | |
857 | } | |
858 | if (strcmp (name, BFD_UND_SECTION_NAME) == 0) | |
859 | { | |
860 | return bfd_und_section_ptr; | |
861 | } | |
862 | ||
863 | if (strcmp (name, BFD_IND_SECTION_NAME) == 0) | |
864 | { | |
865 | return bfd_ind_section_ptr; | |
866 | } | |
867 | ||
868 | while (sect) | |
869 | { | |
870 | if (!strcmp (sect->name, name)) | |
871 | return NULL; | |
872 | sect = sect->next; | |
873 | } | |
874 | ||
875 | /* The name is not already used; go ahead and make a new section. */ | |
876 | return bfd_make_section_anyway (abfd, name); | |
877 | } | |
878 | ||
252b5132 RH |
879 | /* |
880 | FUNCTION | |
881 | bfd_set_section_flags | |
882 | ||
883 | SYNOPSIS | |
884 | boolean bfd_set_section_flags(bfd *abfd, asection *sec, flagword flags); | |
885 | ||
886 | DESCRIPTION | |
887 | Set the attributes of the section @var{sec} in the BFD | |
888 | @var{abfd} to the value @var{flags}. Return <<true>> on success, | |
889 | <<false>> on error. Possible error returns are: | |
890 | ||
891 | o <<bfd_error_invalid_operation>> - | |
892 | The section cannot have one or more of the attributes | |
893 | requested. For example, a .bss section in <<a.out>> may not | |
894 | have the <<SEC_HAS_CONTENTS>> field set. | |
895 | ||
896 | */ | |
897 | ||
898 | /*ARGSUSED*/ | |
899 | boolean | |
900 | bfd_set_section_flags (abfd, section, flags) | |
7442e600 | 901 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
902 | sec_ptr section; |
903 | flagword flags; | |
904 | { | |
905 | #if 0 | |
906 | /* If you try to copy a text section from an input file (where it | |
907 | has the SEC_CODE flag set) to an output file, this loses big if | |
908 | the bfd_applicable_section_flags (abfd) doesn't have the SEC_CODE | |
909 | set - which it doesn't, at least not for a.out. FIXME */ | |
910 | ||
911 | if ((flags & bfd_applicable_section_flags (abfd)) != flags) | |
912 | { | |
913 | bfd_set_error (bfd_error_invalid_operation); | |
914 | return false; | |
915 | } | |
916 | #endif | |
917 | ||
918 | section->flags = flags; | |
919 | return true; | |
920 | } | |
921 | ||
252b5132 RH |
922 | /* |
923 | FUNCTION | |
924 | bfd_map_over_sections | |
925 | ||
926 | SYNOPSIS | |
927 | void bfd_map_over_sections(bfd *abfd, | |
7b82c249 | 928 | void (*func) (bfd *abfd, |
252b5132 RH |
929 | asection *sect, |
930 | PTR obj), | |
931 | PTR obj); | |
932 | ||
933 | DESCRIPTION | |
934 | Call the provided function @var{func} for each section | |
935 | attached to the BFD @var{abfd}, passing @var{obj} as an | |
936 | argument. The function will be called as if by | |
937 | ||
938 | | func(abfd, the_section, obj); | |
939 | ||
940 | This is the prefered method for iterating over sections; an | |
941 | alternative would be to use a loop: | |
942 | ||
943 | | section *p; | |
944 | | for (p = abfd->sections; p != NULL; p = p->next) | |
945 | | func(abfd, p, ...) | |
946 | ||
252b5132 RH |
947 | */ |
948 | ||
949 | /*VARARGS2*/ | |
950 | void | |
951 | bfd_map_over_sections (abfd, operation, user_storage) | |
952 | bfd *abfd; | |
953 | void (*operation) PARAMS ((bfd * abfd, asection * sect, PTR obj)); | |
954 | PTR user_storage; | |
955 | { | |
956 | asection *sect; | |
957 | unsigned int i = 0; | |
958 | ||
959 | for (sect = abfd->sections; sect != NULL; i++, sect = sect->next) | |
960 | (*operation) (abfd, sect, user_storage); | |
961 | ||
962 | if (i != abfd->section_count) /* Debugging */ | |
963 | abort (); | |
964 | } | |
965 | ||
252b5132 RH |
966 | /* |
967 | FUNCTION | |
968 | bfd_set_section_size | |
969 | ||
970 | SYNOPSIS | |
971 | boolean bfd_set_section_size(bfd *abfd, asection *sec, bfd_size_type val); | |
972 | ||
973 | DESCRIPTION | |
974 | Set @var{sec} to the size @var{val}. If the operation is | |
975 | ok, then <<true>> is returned, else <<false>>. | |
976 | ||
977 | Possible error returns: | |
978 | o <<bfd_error_invalid_operation>> - | |
979 | Writing has started to the BFD, so setting the size is invalid. | |
980 | ||
981 | */ | |
982 | ||
983 | boolean | |
984 | bfd_set_section_size (abfd, ptr, val) | |
985 | bfd *abfd; | |
986 | sec_ptr ptr; | |
987 | bfd_size_type val; | |
988 | { | |
989 | /* Once you've started writing to any section you cannot create or change | |
7b82c249 | 990 | the size of any others. */ |
252b5132 RH |
991 | |
992 | if (abfd->output_has_begun) | |
993 | { | |
994 | bfd_set_error (bfd_error_invalid_operation); | |
995 | return false; | |
996 | } | |
997 | ||
998 | ptr->_cooked_size = val; | |
999 | ptr->_raw_size = val; | |
1000 | ||
1001 | return true; | |
1002 | } | |
1003 | ||
1004 | /* | |
1005 | FUNCTION | |
1006 | bfd_set_section_contents | |
1007 | ||
1008 | SYNOPSIS | |
1009 | boolean bfd_set_section_contents | |
1010 | (bfd *abfd, | |
1011 | asection *section, | |
1012 | PTR data, | |
1013 | file_ptr offset, | |
1014 | bfd_size_type count); | |
1015 | ||
252b5132 RH |
1016 | DESCRIPTION |
1017 | Sets the contents of the section @var{section} in BFD | |
1018 | @var{abfd} to the data starting in memory at @var{data}. The | |
1019 | data is written to the output section starting at offset | |
9a968f43 | 1020 | @var{offset} for @var{count} octets. |
252b5132 | 1021 | |
252b5132 RH |
1022 | Normally <<true>> is returned, else <<false>>. Possible error |
1023 | returns are: | |
1024 | o <<bfd_error_no_contents>> - | |
1025 | The output section does not have the <<SEC_HAS_CONTENTS>> | |
1026 | attribute, so nothing can be written to it. | |
1027 | o and some more too | |
1028 | ||
1029 | This routine is front end to the back end function | |
1030 | <<_bfd_set_section_contents>>. | |
1031 | ||
252b5132 RH |
1032 | */ |
1033 | ||
1034 | #define bfd_get_section_size_now(abfd,sec) \ | |
1035 | (sec->reloc_done \ | |
1036 | ? bfd_get_section_size_after_reloc (sec) \ | |
1037 | : bfd_get_section_size_before_reloc (sec)) | |
1038 | ||
1039 | boolean | |
1040 | bfd_set_section_contents (abfd, section, location, offset, count) | |
1041 | bfd *abfd; | |
1042 | sec_ptr section; | |
1043 | PTR location; | |
1044 | file_ptr offset; | |
1045 | bfd_size_type count; | |
1046 | { | |
1047 | bfd_size_type sz; | |
1048 | ||
1049 | if (!(bfd_get_section_flags (abfd, section) & SEC_HAS_CONTENTS)) | |
1050 | { | |
1051 | bfd_set_error (bfd_error_no_contents); | |
1052 | return (false); | |
1053 | } | |
1054 | ||
1055 | if (offset < 0) | |
1056 | { | |
1057 | bad_val: | |
1058 | bfd_set_error (bfd_error_bad_value); | |
1059 | return false; | |
1060 | } | |
1061 | sz = bfd_get_section_size_now (abfd, section); | |
1062 | if ((bfd_size_type) offset > sz | |
1063 | || count > sz | |
1064 | || offset + count > sz) | |
1065 | goto bad_val; | |
1066 | ||
1067 | switch (abfd->direction) | |
1068 | { | |
1069 | case read_direction: | |
1070 | case no_direction: | |
1071 | bfd_set_error (bfd_error_invalid_operation); | |
1072 | return false; | |
1073 | ||
1074 | case write_direction: | |
1075 | break; | |
1076 | ||
1077 | case both_direction: | |
1078 | /* File is opened for update. `output_has_begun' some time ago when | |
1079 | the file was created. Do not recompute sections sizes or alignments | |
1080 | in _bfd_set_section_content. */ | |
1081 | abfd->output_has_begun = true; | |
1082 | break; | |
1083 | } | |
1084 | ||
9a951beb RH |
1085 | /* Record a copy of the data in memory if desired. */ |
1086 | if (section->contents | |
1087 | && location != section->contents + offset) | |
1088 | memcpy (section->contents + offset, location, count); | |
1089 | ||
252b5132 RH |
1090 | if (BFD_SEND (abfd, _bfd_set_section_contents, |
1091 | (abfd, section, location, offset, count))) | |
1092 | { | |
1093 | abfd->output_has_begun = true; | |
1094 | return true; | |
1095 | } | |
1096 | ||
1097 | return false; | |
1098 | } | |
1099 | ||
1100 | /* | |
1101 | FUNCTION | |
1102 | bfd_get_section_contents | |
1103 | ||
1104 | SYNOPSIS | |
1105 | boolean bfd_get_section_contents | |
1106 | (bfd *abfd, asection *section, PTR location, | |
1107 | file_ptr offset, bfd_size_type count); | |
1108 | ||
1109 | DESCRIPTION | |
1110 | Read data from @var{section} in BFD @var{abfd} | |
1111 | into memory starting at @var{location}. The data is read at an | |
1112 | offset of @var{offset} from the start of the input section, | |
1113 | and is read for @var{count} bytes. | |
1114 | ||
1115 | If the contents of a constructor with the <<SEC_CONSTRUCTOR>> | |
1116 | flag set are requested or if the section does not have the | |
1117 | <<SEC_HAS_CONTENTS>> flag set, then the @var{location} is filled | |
1118 | with zeroes. If no errors occur, <<true>> is returned, else | |
1119 | <<false>>. | |
1120 | ||
252b5132 RH |
1121 | */ |
1122 | boolean | |
1123 | bfd_get_section_contents (abfd, section, location, offset, count) | |
1124 | bfd *abfd; | |
1125 | sec_ptr section; | |
1126 | PTR location; | |
1127 | file_ptr offset; | |
1128 | bfd_size_type count; | |
1129 | { | |
1130 | bfd_size_type sz; | |
1131 | ||
1132 | if (section->flags & SEC_CONSTRUCTOR) | |
1133 | { | |
1134 | memset (location, 0, (unsigned) count); | |
1135 | return true; | |
1136 | } | |
1137 | ||
1138 | if (offset < 0) | |
1139 | { | |
1140 | bad_val: | |
1141 | bfd_set_error (bfd_error_bad_value); | |
1142 | return false; | |
1143 | } | |
1144 | /* Even if reloc_done is true, this function reads unrelocated | |
1145 | contents, so we want the raw size. */ | |
1146 | sz = section->_raw_size; | |
1147 | if ((bfd_size_type) offset > sz || count > sz || offset + count > sz) | |
1148 | goto bad_val; | |
1149 | ||
1150 | if (count == 0) | |
1151 | /* Don't bother. */ | |
1152 | return true; | |
1153 | ||
1154 | if ((section->flags & SEC_HAS_CONTENTS) == 0) | |
1155 | { | |
1156 | memset (location, 0, (unsigned) count); | |
1157 | return true; | |
1158 | } | |
1159 | ||
1160 | if ((section->flags & SEC_IN_MEMORY) != 0) | |
1161 | { | |
1162 | memcpy (location, section->contents + offset, (size_t) count); | |
1163 | return true; | |
1164 | } | |
1165 | ||
1166 | return BFD_SEND (abfd, _bfd_get_section_contents, | |
1167 | (abfd, section, location, offset, count)); | |
1168 | } | |
1169 | ||
1170 | /* | |
1171 | FUNCTION | |
1172 | bfd_copy_private_section_data | |
1173 | ||
1174 | SYNOPSIS | |
1175 | boolean bfd_copy_private_section_data(bfd *ibfd, asection *isec, bfd *obfd, asection *osec); | |
1176 | ||
1177 | DESCRIPTION | |
1178 | Copy private section information from @var{isec} in the BFD | |
1179 | @var{ibfd} to the section @var{osec} in the BFD @var{obfd}. | |
1180 | Return <<true>> on success, <<false>> on error. Possible error | |
1181 | returns are: | |
1182 | ||
1183 | o <<bfd_error_no_memory>> - | |
1184 | Not enough memory exists to create private data for @var{osec}. | |
1185 | ||
1186 | .#define bfd_copy_private_section_data(ibfd, isection, obfd, osection) \ | |
1187 | . BFD_SEND (obfd, _bfd_copy_private_section_data, \ | |
1188 | . (ibfd, isection, obfd, osection)) | |
1189 | */ | |
1190 | ||
1191 | /* | |
1192 | FUNCTION | |
1193 | _bfd_strip_section_from_output | |
1194 | ||
1195 | SYNOPSIS | |
1196 | void _bfd_strip_section_from_output | |
7f8d5fc9 | 1197 | (struct bfd_link_info *info, asection *section); |
252b5132 RH |
1198 | |
1199 | DESCRIPTION | |
7f8d5fc9 ILT |
1200 | Remove @var{section} from the output. If the output section |
1201 | becomes empty, remove it from the output bfd. @var{info} may | |
1202 | be NULL; if it is not, it is used to decide whether the output | |
1203 | section is empty. | |
252b5132 RH |
1204 | */ |
1205 | void | |
7f8d5fc9 ILT |
1206 | _bfd_strip_section_from_output (info, s) |
1207 | struct bfd_link_info *info; | |
252b5132 RH |
1208 | asection *s; |
1209 | { | |
1210 | asection **spp, *os; | |
1211 | struct bfd_link_order *p, *pp; | |
7f8d5fc9 | 1212 | boolean keep_os; |
252b5132 | 1213 | |
7f8d5fc9 ILT |
1214 | /* Excise the input section from the link order. |
1215 | ||
1216 | FIXME: For all calls that I can see to this function, the link | |
1217 | orders have not yet been set up. So why are we checking them? -- | |
1218 | Ian */ | |
252b5132 RH |
1219 | os = s->output_section; |
1220 | for (p = os->link_order_head, pp = NULL; p != NULL; pp = p, p = p->next) | |
1221 | if (p->type == bfd_indirect_link_order | |
1222 | && p->u.indirect.section == s) | |
1223 | { | |
252b5132 RH |
1224 | if (pp) |
1225 | pp->next = p->next; | |
1226 | else | |
1227 | os->link_order_head = p->next; | |
1228 | if (!p->next) | |
1229 | os->link_order_tail = pp; | |
9d7428a9 RH |
1230 | break; |
1231 | } | |
252b5132 | 1232 | |
7f8d5fc9 ILT |
1233 | keep_os = os->link_order_head != NULL; |
1234 | ||
1235 | if (! keep_os && info != NULL) | |
1236 | { | |
1237 | bfd *abfd; | |
1238 | for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next) | |
1239 | { | |
1240 | asection *is; | |
1241 | for (is = abfd->sections; is != NULL; is = is->next) | |
1242 | { | |
1243 | if (is != s && is->output_section == os) | |
1244 | break; | |
1245 | } | |
1246 | if (is != NULL) | |
1247 | break; | |
1248 | } | |
1249 | if (abfd != NULL) | |
1250 | keep_os = true; | |
1251 | } | |
1252 | ||
0bde07d4 | 1253 | /* If the output section is empty, remove it too. Careful about sections |
52b219b5 | 1254 | that have been discarded in the link script -- they are mapped to |
0bde07d4 | 1255 | bfd_abs_section, which has no owner. */ |
7f8d5fc9 | 1256 | if (!keep_os && os->owner != NULL) |
9d7428a9 RH |
1257 | { |
1258 | for (spp = &os->owner->sections; *spp; spp = &(*spp)->next) | |
1259 | if (*spp == os) | |
252b5132 | 1260 | { |
9d7428a9 RH |
1261 | *spp = os->next; |
1262 | os->owner->section_count--; | |
1263 | break; | |
252b5132 | 1264 | } |
9d7428a9 | 1265 | } |
252b5132 | 1266 | } |