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252b5132 | 1 | /* Object file "section" support for the BFD library. |
7898deda | 2 | Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, |
68bfbfcc | 3 | 2000, 2001, 2002, 2003 |
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. *} | |
52b219b5 AM |
173 | . const char *name; |
174 | . | |
175 | . {* A unique sequence number. *} | |
52b219b5 | 176 | . int id; |
252b5132 | 177 | . |
dbb410c3 | 178 | . {* Which section in the bfd; 0..n-1 as sections are created in a bfd. *} |
52b219b5 | 179 | . int index; |
252b5132 | 180 | . |
52b219b5 | 181 | . {* The next section in the list belonging to the BFD, or NULL. *} |
52b219b5 | 182 | . struct sec *next; |
252b5132 | 183 | . |
52b219b5 AM |
184 | . {* The field flags contains attributes of the section. Some |
185 | . flags are read in from the object file, and some are | |
186 | . synthesized from other information. *} | |
52b219b5 | 187 | . flagword flags; |
252b5132 RH |
188 | . |
189 | .#define SEC_NO_FLAGS 0x000 | |
190 | . | |
52b219b5 AM |
191 | . {* Tells the OS to allocate space for this section when loading. |
192 | . This is clear for a section containing debug information only. *} | |
252b5132 RH |
193 | .#define SEC_ALLOC 0x001 |
194 | . | |
52b219b5 AM |
195 | . {* Tells the OS to load the section from the file when loading. |
196 | . This is clear for a .bss section. *} | |
252b5132 RH |
197 | .#define SEC_LOAD 0x002 |
198 | . | |
52b219b5 AM |
199 | . {* The section contains data still to be relocated, so there is |
200 | . some relocation information too. *} | |
252b5132 RH |
201 | .#define SEC_RELOC 0x004 |
202 | . | |
65db3b0d RH |
203 | . {* ELF reserves 4 processor specific bits and 8 operating system |
204 | . specific bits in sh_flags; at present we can get away with just | |
205 | . one in communicating between the assembler and BFD, but this | |
206 | . isn't a good long-term solution. *} | |
207 | .#define SEC_ARCH_BIT_0 0x008 | |
252b5132 | 208 | . |
52b219b5 | 209 | . {* A signal to the OS that the section contains read only data. *} |
252b5132 RH |
210 | .#define SEC_READONLY 0x010 |
211 | . | |
52b219b5 | 212 | . {* The section contains code only. *} |
252b5132 RH |
213 | .#define SEC_CODE 0x020 |
214 | . | |
52b219b5 | 215 | . {* The section contains data only. *} |
252b5132 RH |
216 | .#define SEC_DATA 0x040 |
217 | . | |
52b219b5 | 218 | . {* The section will reside in ROM. *} |
252b5132 RH |
219 | .#define SEC_ROM 0x080 |
220 | . | |
52b219b5 AM |
221 | . {* The section contains constructor information. This section |
222 | . type is used by the linker to create lists of constructors and | |
223 | . destructors used by <<g++>>. When a back end sees a symbol | |
224 | . which should be used in a constructor list, it creates a new | |
225 | . section for the type of name (e.g., <<__CTOR_LIST__>>), attaches | |
226 | . the symbol to it, and builds a relocation. To build the lists | |
227 | . of constructors, all the linker has to do is catenate all the | |
228 | . sections called <<__CTOR_LIST__>> and relocate the data | |
229 | . contained within - exactly the operations it would peform on | |
230 | . standard data. *} | |
252b5132 RH |
231 | .#define SEC_CONSTRUCTOR 0x100 |
232 | . | |
52b219b5 AM |
233 | . {* The section has contents - a data section could be |
234 | . <<SEC_ALLOC>> | <<SEC_HAS_CONTENTS>>; a debug section could be | |
235 | . <<SEC_HAS_CONTENTS>> *} | |
252b5132 RH |
236 | .#define SEC_HAS_CONTENTS 0x200 |
237 | . | |
52b219b5 AM |
238 | . {* An instruction to the linker to not output the section |
239 | . even if it has information which would normally be written. *} | |
252b5132 RH |
240 | .#define SEC_NEVER_LOAD 0x400 |
241 | . | |
52b219b5 AM |
242 | . {* The section is a COFF shared library section. This flag is |
243 | . only for the linker. If this type of section appears in | |
244 | . the input file, the linker must copy it to the output file | |
245 | . without changing the vma or size. FIXME: Although this | |
246 | . was originally intended to be general, it really is COFF | |
247 | . specific (and the flag was renamed to indicate this). It | |
248 | . might be cleaner to have some more general mechanism to | |
249 | . allow the back end to control what the linker does with | |
250 | . sections. *} | |
252b5132 RH |
251 | .#define SEC_COFF_SHARED_LIBRARY 0x800 |
252 | . | |
13ae64f3 JJ |
253 | . {* The section contains thread local data. *} |
254 | .#define SEC_THREAD_LOCAL 0x1000 | |
255 | . | |
1bd91689 AM |
256 | . {* The section has GOT references. This flag is only for the |
257 | . linker, and is currently only used by the elf32-hppa back end. | |
258 | . It will be set if global offset table references were detected | |
259 | . in this section, which indicate to the linker that the section | |
260 | . contains PIC code, and must be handled specially when doing a | |
261 | . static link. *} | |
262 | .#define SEC_HAS_GOT_REF 0x4000 | |
263 | . | |
52b219b5 AM |
264 | . {* The section contains common symbols (symbols may be defined |
265 | . multiple times, the value of a symbol is the amount of | |
266 | . space it requires, and the largest symbol value is the one | |
267 | . used). Most targets have exactly one of these (which we | |
268 | . translate to bfd_com_section_ptr), but ECOFF has two. *} | |
252b5132 RH |
269 | .#define SEC_IS_COMMON 0x8000 |
270 | . | |
52b219b5 AM |
271 | . {* The section contains only debugging information. For |
272 | . example, this is set for ELF .debug and .stab sections. | |
273 | . strip tests this flag to see if a section can be | |
274 | . discarded. *} | |
252b5132 RH |
275 | .#define SEC_DEBUGGING 0x10000 |
276 | . | |
52b219b5 AM |
277 | . {* The contents of this section are held in memory pointed to |
278 | . by the contents field. This is checked by bfd_get_section_contents, | |
279 | . and the data is retrieved from memory if appropriate. *} | |
252b5132 RH |
280 | .#define SEC_IN_MEMORY 0x20000 |
281 | . | |
52b219b5 AM |
282 | . {* The contents of this section are to be excluded by the |
283 | . linker for executable and shared objects unless those | |
284 | . objects are to be further relocated. *} | |
252b5132 RH |
285 | .#define SEC_EXCLUDE 0x40000 |
286 | . | |
dbb410c3 AM |
287 | . {* The contents of this section are to be sorted based on the sum of |
288 | . the symbol and addend values specified by the associated relocation | |
289 | . entries. Entries without associated relocation entries will be | |
290 | . appended to the end of the section in an unspecified order. *} | |
252b5132 RH |
291 | .#define SEC_SORT_ENTRIES 0x80000 |
292 | . | |
52b219b5 AM |
293 | . {* When linking, duplicate sections of the same name should be |
294 | . discarded, rather than being combined into a single section as | |
295 | . is usually done. This is similar to how common symbols are | |
296 | . handled. See SEC_LINK_DUPLICATES below. *} | |
252b5132 RH |
297 | .#define SEC_LINK_ONCE 0x100000 |
298 | . | |
52b219b5 AM |
299 | . {* If SEC_LINK_ONCE is set, this bitfield describes how the linker |
300 | . should handle duplicate sections. *} | |
252b5132 RH |
301 | .#define SEC_LINK_DUPLICATES 0x600000 |
302 | . | |
52b219b5 AM |
303 | . {* This value for SEC_LINK_DUPLICATES means that duplicate |
304 | . sections with the same name should simply be discarded. *} | |
252b5132 RH |
305 | .#define SEC_LINK_DUPLICATES_DISCARD 0x0 |
306 | . | |
52b219b5 AM |
307 | . {* This value for SEC_LINK_DUPLICATES means that the linker |
308 | . should warn if there are any duplicate sections, although | |
309 | . it should still only link one copy. *} | |
252b5132 RH |
310 | .#define SEC_LINK_DUPLICATES_ONE_ONLY 0x200000 |
311 | . | |
52b219b5 AM |
312 | . {* This value for SEC_LINK_DUPLICATES means that the linker |
313 | . should warn if any duplicate sections are a different size. *} | |
252b5132 RH |
314 | .#define SEC_LINK_DUPLICATES_SAME_SIZE 0x400000 |
315 | . | |
52b219b5 AM |
316 | . {* This value for SEC_LINK_DUPLICATES means that the linker |
317 | . should warn if any duplicate sections contain different | |
318 | . contents. *} | |
252b5132 RH |
319 | .#define SEC_LINK_DUPLICATES_SAME_CONTENTS 0x600000 |
320 | . | |
52b219b5 AM |
321 | . {* This section was created by the linker as part of dynamic |
322 | . relocation or other arcane processing. It is skipped when | |
323 | . going through the first-pass output, trusting that someone | |
324 | . else up the line will take care of it later. *} | |
252b5132 RH |
325 | .#define SEC_LINKER_CREATED 0x800000 |
326 | . | |
52b219b5 | 327 | . {* This section should not be subject to garbage collection. *} |
252b5132 RH |
328 | .#define SEC_KEEP 0x1000000 |
329 | . | |
52b219b5 AM |
330 | . {* This section contains "short" data, and should be placed |
331 | . "near" the GP. *} | |
851edbaf | 332 | .#define SEC_SMALL_DATA 0x2000000 |
0c3ff40b | 333 | . |
52b219b5 AM |
334 | . {* This section contains data which may be shared with other |
335 | . executables or shared objects. *} | |
bd826630 ILT |
336 | .#define SEC_SHARED 0x4000000 |
337 | . | |
52b219b5 AM |
338 | . {* When a section with this flag is being linked, then if the size of |
339 | . the input section is less than a page, it should not cross a page | |
340 | . boundary. If the size of the input section is one page or more, it | |
341 | . should be aligned on a page boundary. *} | |
34cbe64e TW |
342 | .#define SEC_BLOCK 0x8000000 |
343 | . | |
52b219b5 AM |
344 | . {* Conditionally link this section; do not link if there are no |
345 | . references found to any symbol in the section. *} | |
34cbe64e TW |
346 | .#define SEC_CLINK 0x10000000 |
347 | . | |
2dd439c5 L |
348 | . {* Attempt to merge identical entities in the section. |
349 | . Entity size is given in the entsize field. *} | |
350 | .#define SEC_MERGE 0x20000000 | |
351 | . | |
352 | . {* If given with SEC_MERGE, entities to merge are zero terminated | |
353 | . strings where entsize specifies character size instead of fixed | |
354 | . size entries. *} | |
355 | .#define SEC_STRINGS 0x40000000 | |
356 | . | |
dbb410c3 AM |
357 | . {* This section contains data about section groups. *} |
358 | .#define SEC_GROUP 0x80000000 | |
359 | . | |
52b219b5 | 360 | . {* End of section flags. *} |
252b5132 | 361 | . |
52b219b5 | 362 | . {* Some internal packed boolean fields. *} |
252b5132 | 363 | . |
52b219b5 AM |
364 | . {* See the vma field. *} |
365 | . unsigned int user_set_vma : 1; | |
252b5132 | 366 | . |
52b219b5 AM |
367 | . {* Whether relocations have been processed. *} |
368 | . unsigned int reloc_done : 1; | |
252b5132 | 369 | . |
52b219b5 AM |
370 | . {* A mark flag used by some of the linker backends. *} |
371 | . unsigned int linker_mark : 1; | |
252b5132 | 372 | . |
d1778b88 | 373 | . {* Another mark flag used by some of the linker backends. Set for |
08da05b0 | 374 | . output sections that have an input section. *} |
d1778b88 AM |
375 | . unsigned int linker_has_input : 1; |
376 | . | |
52b219b5 AM |
377 | . {* A mark flag used by some linker backends for garbage collection. *} |
378 | . unsigned int gc_mark : 1; | |
252b5132 | 379 | . |
68bfbfcc AM |
380 | . {* The following flags are used by the ELF linker. *} |
381 | . | |
382 | . {* Mark sections which have been allocated to segments. *} | |
bc67d8a6 NC |
383 | . unsigned int segment_mark : 1; |
384 | . | |
68bfbfcc AM |
385 | . {* Type of sec_info information. *} |
386 | . unsigned int sec_info_type:3; | |
387 | .#define ELF_INFO_TYPE_NONE 0 | |
388 | .#define ELF_INFO_TYPE_STABS 1 | |
389 | .#define ELF_INFO_TYPE_MERGE 2 | |
390 | .#define ELF_INFO_TYPE_EH_FRAME 3 | |
391 | .#define ELF_INFO_TYPE_JUST_SYMS 4 | |
392 | . | |
393 | . {* Nonzero if this section uses RELA relocations, rather than REL. *} | |
394 | . unsigned int use_rela_p:1; | |
395 | . | |
396 | . {* Bits used by various backends. *} | |
397 | . unsigned int has_tls_reloc:1; | |
398 | . | |
c7996ad6 L |
399 | . {* Nonzero if this section needs the relax finalize pass. *} |
400 | . unsigned int need_finalize_relax:1; | |
401 | . | |
ad8e1ba5 AM |
402 | . {* Nonzero if this section has a gp reloc. *} |
403 | . unsigned int has_gp_reloc:1; | |
404 | . | |
68bfbfcc | 405 | . {* Usused bits. *} |
68bfbfcc AM |
406 | . unsigned int flag13:1; |
407 | . unsigned int flag14:1; | |
408 | . unsigned int flag15:1; | |
409 | . unsigned int flag16:4; | |
410 | . unsigned int flag20:4; | |
411 | . unsigned int flag24:8; | |
412 | . | |
52b219b5 | 413 | . {* End of internal packed boolean fields. *} |
252b5132 | 414 | . |
52b219b5 AM |
415 | . {* The virtual memory address of the section - where it will be |
416 | . at run time. The symbols are relocated against this. The | |
417 | . user_set_vma flag is maintained by bfd; if it's not set, the | |
418 | . backend can assign addresses (for example, in <<a.out>>, where | |
419 | . the default address for <<.data>> is dependent on the specific | |
420 | . target and various flags). *} | |
52b219b5 | 421 | . bfd_vma vma; |
252b5132 | 422 | . |
52b219b5 AM |
423 | . {* The load address of the section - where it would be in a |
424 | . rom image; really only used for writing section header | |
b5f79c76 | 425 | . information. *} |
52b219b5 | 426 | . bfd_vma lma; |
252b5132 | 427 | . |
52b219b5 AM |
428 | . {* The size of the section in octets, as it will be output. |
429 | . Contains a value even if the section has no contents (e.g., the | |
430 | . size of <<.bss>>). This will be filled in after relocation. *} | |
52b219b5 | 431 | . bfd_size_type _cooked_size; |
252b5132 | 432 | . |
52b219b5 AM |
433 | . {* The original size on disk of the section, in octets. Normally this |
434 | . value is the same as the size, but if some relaxing has | |
435 | . been done, then this value will be bigger. *} | |
52b219b5 | 436 | . bfd_size_type _raw_size; |
252b5132 | 437 | . |
52b219b5 AM |
438 | . {* If this section is going to be output, then this value is the |
439 | . offset in *bytes* into the output section of the first byte in the | |
440 | . input section (byte ==> smallest addressable unit on the | |
441 | . target). In most cases, if this was going to start at the | |
442 | . 100th octet (8-bit quantity) in the output section, this value | |
443 | . would be 100. However, if the target byte size is 16 bits | |
444 | . (bfd_octets_per_byte is "2"), this value would be 50. *} | |
52b219b5 | 445 | . bfd_vma output_offset; |
252b5132 | 446 | . |
52b219b5 | 447 | . {* The output section through which to map on output. *} |
52b219b5 | 448 | . struct sec *output_section; |
252b5132 | 449 | . |
52b219b5 AM |
450 | . {* The alignment requirement of the section, as an exponent of 2 - |
451 | . e.g., 3 aligns to 2^3 (or 8). *} | |
52b219b5 | 452 | . unsigned int alignment_power; |
252b5132 | 453 | . |
52b219b5 AM |
454 | . {* If an input section, a pointer to a vector of relocation |
455 | . records for the data in this section. *} | |
52b219b5 | 456 | . struct reloc_cache_entry *relocation; |
252b5132 | 457 | . |
52b219b5 AM |
458 | . {* If an output section, a pointer to a vector of pointers to |
459 | . relocation records for the data in this section. *} | |
52b219b5 | 460 | . struct reloc_cache_entry **orelocation; |
252b5132 | 461 | . |
b5f79c76 | 462 | . {* The number of relocation records in one of the above. *} |
52b219b5 | 463 | . unsigned reloc_count; |
252b5132 | 464 | . |
52b219b5 AM |
465 | . {* Information below is back end specific - and not always used |
466 | . or updated. *} | |
252b5132 | 467 | . |
52b219b5 | 468 | . {* File position of section data. *} |
52b219b5 | 469 | . file_ptr filepos; |
252b5132 | 470 | . |
52b219b5 | 471 | . {* File position of relocation info. *} |
52b219b5 | 472 | . file_ptr rel_filepos; |
252b5132 | 473 | . |
52b219b5 | 474 | . {* File position of line data. *} |
52b219b5 | 475 | . file_ptr line_filepos; |
252b5132 | 476 | . |
52b219b5 | 477 | . {* Pointer to data for applications. *} |
c58b9523 | 478 | . void *userdata; |
252b5132 | 479 | . |
52b219b5 AM |
480 | . {* If the SEC_IN_MEMORY flag is set, this points to the actual |
481 | . contents. *} | |
482 | . unsigned char *contents; | |
252b5132 | 483 | . |
52b219b5 | 484 | . {* Attached line number information. *} |
52b219b5 | 485 | . alent *lineno; |
252b5132 | 486 | . |
52b219b5 | 487 | . {* Number of line number records. *} |
52b219b5 | 488 | . unsigned int lineno_count; |
252b5132 | 489 | . |
2dd439c5 | 490 | . {* Entity size for merging purposes. *} |
2dd439c5 L |
491 | . unsigned int entsize; |
492 | . | |
52b219b5 | 493 | . {* Optional information about a COMDAT entry; NULL if not COMDAT. *} |
52b219b5 | 494 | . struct bfd_comdat_info *comdat; |
022a5af4 | 495 | . |
f97b9cb8 L |
496 | . {* Points to the kept section if this section is a link-once section, |
497 | . and is discarded. *} | |
498 | . struct sec *kept_section; | |
499 | . | |
52b219b5 AM |
500 | . {* When a section is being output, this value changes as more |
501 | . linenumbers are written out. *} | |
52b219b5 | 502 | . file_ptr moving_line_filepos; |
252b5132 | 503 | . |
52b219b5 | 504 | . {* What the section number is in the target world. *} |
52b219b5 | 505 | . int target_index; |
252b5132 | 506 | . |
c58b9523 | 507 | . void *used_by_bfd; |
252b5132 | 508 | . |
52b219b5 AM |
509 | . {* If this is a constructor section then here is a list of the |
510 | . relocations created to relocate items within it. *} | |
52b219b5 | 511 | . struct relent_chain *constructor_chain; |
252b5132 | 512 | . |
52b219b5 | 513 | . {* The BFD which owns the section. *} |
52b219b5 | 514 | . bfd *owner; |
252b5132 | 515 | . |
b5f79c76 | 516 | . {* A symbol which points at this section only. *} |
52b219b5 AM |
517 | . struct symbol_cache_entry *symbol; |
518 | . struct symbol_cache_entry **symbol_ptr_ptr; | |
252b5132 | 519 | . |
52b219b5 AM |
520 | . struct bfd_link_order *link_order_head; |
521 | . struct bfd_link_order *link_order_tail; | |
b5f79c76 | 522 | .} asection; |
252b5132 | 523 | . |
52b219b5 AM |
524 | .{* These sections are global, and are managed by BFD. The application |
525 | . and target back end are not permitted to change the values in | |
526 | . these sections. New code should use the section_ptr macros rather | |
527 | . than referring directly to the const sections. The const sections | |
528 | . may eventually vanish. *} | |
252b5132 RH |
529 | .#define BFD_ABS_SECTION_NAME "*ABS*" |
530 | .#define BFD_UND_SECTION_NAME "*UND*" | |
531 | .#define BFD_COM_SECTION_NAME "*COM*" | |
532 | .#define BFD_IND_SECTION_NAME "*IND*" | |
533 | . | |
b5f79c76 | 534 | .{* The absolute section. *} |
2f89ff8d | 535 | .extern asection bfd_abs_section; |
252b5132 RH |
536 | .#define bfd_abs_section_ptr ((asection *) &bfd_abs_section) |
537 | .#define bfd_is_abs_section(sec) ((sec) == bfd_abs_section_ptr) | |
b5f79c76 | 538 | .{* Pointer to the undefined section. *} |
2f89ff8d | 539 | .extern asection bfd_und_section; |
252b5132 RH |
540 | .#define bfd_und_section_ptr ((asection *) &bfd_und_section) |
541 | .#define bfd_is_und_section(sec) ((sec) == bfd_und_section_ptr) | |
b5f79c76 | 542 | .{* Pointer to the common section. *} |
2f89ff8d | 543 | .extern asection bfd_com_section; |
252b5132 | 544 | .#define bfd_com_section_ptr ((asection *) &bfd_com_section) |
b5f79c76 | 545 | .{* Pointer to the indirect section. *} |
2f89ff8d | 546 | .extern asection bfd_ind_section; |
252b5132 RH |
547 | .#define bfd_ind_section_ptr ((asection *) &bfd_ind_section) |
548 | .#define bfd_is_ind_section(sec) ((sec) == bfd_ind_section_ptr) | |
549 | . | |
84c254c6 NC |
550 | .#define bfd_is_const_section(SEC) \ |
551 | . ( ((SEC) == bfd_abs_section_ptr) \ | |
552 | . || ((SEC) == bfd_und_section_ptr) \ | |
553 | . || ((SEC) == bfd_com_section_ptr) \ | |
554 | . || ((SEC) == bfd_ind_section_ptr)) | |
555 | . | |
252b5132 RH |
556 | .extern const struct symbol_cache_entry * const bfd_abs_symbol; |
557 | .extern const struct symbol_cache_entry * const bfd_com_symbol; | |
558 | .extern const struct symbol_cache_entry * const bfd_und_symbol; | |
559 | .extern const struct symbol_cache_entry * const bfd_ind_symbol; | |
560 | .#define bfd_get_section_size_before_reloc(section) \ | |
f6af82bd AM |
561 | . ((section)->reloc_done ? (abort (), (bfd_size_type) 1) \ |
562 | . : (section)->_raw_size) | |
252b5132 | 563 | .#define bfd_get_section_size_after_reloc(section) \ |
f6af82bd AM |
564 | . ((section)->reloc_done ? (section)->_cooked_size \ |
565 | . : (abort (), (bfd_size_type) 1)) | |
9e7b37b3 AM |
566 | . |
567 | .{* Macros to handle insertion and deletion of a bfd's sections. These | |
568 | . only handle the list pointers, ie. do not adjust section_count, | |
569 | . target_index etc. *} | |
570 | .#define bfd_section_list_remove(ABFD, PS) \ | |
571 | . do \ | |
572 | . { \ | |
573 | . asection **_ps = PS; \ | |
574 | . asection *_s = *_ps; \ | |
575 | . *_ps = _s->next; \ | |
576 | . if (_s->next == NULL) \ | |
577 | . (ABFD)->section_tail = _ps; \ | |
578 | . } \ | |
579 | . while (0) | |
580 | .#define bfd_section_list_insert(ABFD, PS, S) \ | |
581 | . do \ | |
582 | . { \ | |
583 | . asection **_ps = PS; \ | |
584 | . asection *_s = S; \ | |
585 | . _s->next = *_ps; \ | |
586 | . *_ps = _s; \ | |
587 | . if (_s->next == NULL) \ | |
588 | . (ABFD)->section_tail = &_s->next; \ | |
589 | . } \ | |
590 | . while (0) | |
591 | . | |
252b5132 RH |
592 | */ |
593 | ||
22bc497d ILT |
594 | /* We use a macro to initialize the static asymbol structures because |
595 | traditional C does not permit us to initialize a union member while | |
596 | gcc warns if we don't initialize it. */ | |
597 | /* the_bfd, name, value, attr, section [, udata] */ | |
598 | #ifdef __STDC__ | |
599 | #define GLOBAL_SYM_INIT(NAME, SECTION) \ | |
600 | { 0, NAME, 0, BSF_SECTION_SYM, (asection *) SECTION, { 0 }} | |
601 | #else | |
602 | #define GLOBAL_SYM_INIT(NAME, SECTION) \ | |
603 | { 0, NAME, 0, BSF_SECTION_SYM, (asection *) SECTION } | |
604 | #endif | |
605 | ||
252b5132 RH |
606 | /* These symbols are global, not specific to any BFD. Therefore, anything |
607 | that tries to change them is broken, and should be repaired. */ | |
22bc497d | 608 | |
252b5132 RH |
609 | static const asymbol global_syms[] = |
610 | { | |
22bc497d ILT |
611 | GLOBAL_SYM_INIT (BFD_COM_SECTION_NAME, &bfd_com_section), |
612 | GLOBAL_SYM_INIT (BFD_UND_SECTION_NAME, &bfd_und_section), | |
613 | GLOBAL_SYM_INIT (BFD_ABS_SECTION_NAME, &bfd_abs_section), | |
614 | GLOBAL_SYM_INIT (BFD_IND_SECTION_NAME, &bfd_ind_section) | |
252b5132 RH |
615 | }; |
616 | ||
bc67d8a6 NC |
617 | #define STD_SECTION(SEC, FLAGS, SYM, NAME, IDX) \ |
618 | const asymbol * const SYM = (asymbol *) &global_syms[IDX]; \ | |
2f89ff8d | 619 | asection SEC = \ |
3df7b4e2 AM |
620 | /* name, id, index, next, flags, user_set_vma, reloc_done, */ \ |
621 | { NAME, IDX, 0, NULL, FLAGS, 0, 0, \ | |
52b219b5 | 622 | \ |
d1778b88 AM |
623 | /* linker_mark, linker_has_input, gc_mark, segment_mark, */ \ |
624 | 0, 0, 1, 0, \ | |
625 | \ | |
ad8e1ba5 AM |
626 | /* sec_info_type, use_rela_p, has_tls_reloc, */ \ |
627 | 0, 0, 0, \ | |
628 | \ | |
629 | /* need_finalize_relax, has_gp_reloc, */ \ | |
630 | 0, 0, \ | |
68bfbfcc AM |
631 | \ |
632 | /* flag13, flag14, flag15, flag16, flag20, flag24, */ \ | |
633 | 0, 0, 0, 0, 0, 0, \ | |
634 | \ | |
d1778b88 AM |
635 | /* vma, lma, _cooked_size, _raw_size, */ \ |
636 | 0, 0, 0, 0, \ | |
52b219b5 | 637 | \ |
d1778b88 AM |
638 | /* output_offset, output_section, alignment_power, */ \ |
639 | 0, (struct sec *) &SEC, 0, \ | |
52b219b5 AM |
640 | \ |
641 | /* relocation, orelocation, reloc_count, filepos, rel_filepos, */ \ | |
642 | NULL, NULL, 0, 0, 0, \ | |
643 | \ | |
644 | /* line_filepos, userdata, contents, lineno, lineno_count, */ \ | |
645 | 0, NULL, NULL, NULL, 0, \ | |
646 | \ | |
f97b9cb8 L |
647 | /* entsize, comdat, kept_section, moving_line_filepos, */ \ |
648 | 0, NULL, NULL, 0, \ | |
52b219b5 | 649 | \ |
767e4b0d JJ |
650 | /* target_index, used_by_bfd, constructor_chain, owner, */ \ |
651 | 0, NULL, NULL, NULL, \ | |
52b219b5 AM |
652 | \ |
653 | /* symbol, */ \ | |
654 | (struct symbol_cache_entry *) &global_syms[IDX], \ | |
655 | \ | |
656 | /* symbol_ptr_ptr, */ \ | |
657 | (struct symbol_cache_entry **) &SYM, \ | |
658 | \ | |
659 | /* link_order_head, link_order_tail */ \ | |
660 | NULL, NULL \ | |
022a5af4 | 661 | } |
252b5132 RH |
662 | |
663 | STD_SECTION (bfd_com_section, SEC_IS_COMMON, bfd_com_symbol, | |
664 | BFD_COM_SECTION_NAME, 0); | |
665 | STD_SECTION (bfd_und_section, 0, bfd_und_symbol, BFD_UND_SECTION_NAME, 1); | |
666 | STD_SECTION (bfd_abs_section, 0, bfd_abs_symbol, BFD_ABS_SECTION_NAME, 2); | |
667 | STD_SECTION (bfd_ind_section, 0, bfd_ind_symbol, BFD_IND_SECTION_NAME, 3); | |
668 | #undef STD_SECTION | |
669 | ||
73e87d70 AM |
670 | struct section_hash_entry |
671 | { | |
672 | struct bfd_hash_entry root; | |
673 | asection section; | |
674 | }; | |
675 | ||
676 | /* Initialize an entry in the section hash table. */ | |
677 | ||
678 | struct bfd_hash_entry * | |
c58b9523 AM |
679 | bfd_section_hash_newfunc (struct bfd_hash_entry *entry, |
680 | struct bfd_hash_table *table, | |
681 | const char *string) | |
73e87d70 AM |
682 | { |
683 | /* Allocate the structure if it has not already been allocated by a | |
684 | subclass. */ | |
685 | if (entry == NULL) | |
686 | { | |
d45913a0 DA |
687 | entry = (struct bfd_hash_entry *) |
688 | bfd_hash_allocate (table, sizeof (struct section_hash_entry)); | |
73e87d70 AM |
689 | if (entry == NULL) |
690 | return entry; | |
691 | } | |
692 | ||
693 | /* Call the allocation method of the superclass. */ | |
694 | entry = bfd_hash_newfunc (entry, table, string); | |
695 | if (entry != NULL) | |
c58b9523 AM |
696 | memset (&((struct section_hash_entry *) entry)->section, 0, |
697 | sizeof (asection)); | |
73e87d70 AM |
698 | |
699 | return entry; | |
700 | } | |
701 | ||
702 | #define section_hash_lookup(table, string, create, copy) \ | |
703 | ((struct section_hash_entry *) \ | |
704 | bfd_hash_lookup ((table), (string), (create), (copy))) | |
705 | ||
706 | /* Initializes a new section. NEWSECT->NAME is already set. */ | |
707 | ||
73e87d70 | 708 | static asection * |
c58b9523 | 709 | bfd_section_init (bfd *abfd, asection *newsect) |
73e87d70 AM |
710 | { |
711 | static int section_id = 0x10; /* id 0 to 3 used by STD_SECTION. */ | |
712 | ||
713 | newsect->id = section_id; | |
714 | newsect->index = abfd->section_count; | |
73e87d70 | 715 | newsect->owner = abfd; |
73e87d70 AM |
716 | |
717 | /* Create a symbol whose only job is to point to this section. This | |
718 | is useful for things like relocs which are relative to the base | |
719 | of a section. */ | |
720 | newsect->symbol = bfd_make_empty_symbol (abfd); | |
721 | if (newsect->symbol == NULL) | |
722 | return NULL; | |
723 | ||
724 | newsect->symbol->name = newsect->name; | |
725 | newsect->symbol->value = 0; | |
726 | newsect->symbol->section = newsect; | |
727 | newsect->symbol->flags = BSF_SECTION_SYM; | |
728 | ||
729 | newsect->symbol_ptr_ptr = &newsect->symbol; | |
730 | ||
731 | if (! BFD_SEND (abfd, _new_section_hook, (abfd, newsect))) | |
732 | return NULL; | |
733 | ||
734 | section_id++; | |
735 | abfd->section_count++; | |
736 | *abfd->section_tail = newsect; | |
737 | abfd->section_tail = &newsect->next; | |
738 | return newsect; | |
739 | } | |
740 | ||
252b5132 RH |
741 | /* |
742 | DOCDD | |
743 | INODE | |
744 | section prototypes, , typedef asection, Sections | |
745 | SUBSECTION | |
746 | Section prototypes | |
747 | ||
748 | These are the functions exported by the section handling part of BFD. | |
749 | */ | |
750 | ||
9e7b37b3 AM |
751 | /* |
752 | FUNCTION | |
753 | bfd_section_list_clear | |
754 | ||
755 | SYNOPSIS | |
756 | void bfd_section_list_clear (bfd *); | |
757 | ||
758 | DESCRIPTION | |
759 | Clears the section list, and also resets the section count and | |
760 | hash table entries. | |
761 | */ | |
762 | ||
763 | void | |
c58b9523 | 764 | bfd_section_list_clear (bfd *abfd) |
9e7b37b3 AM |
765 | { |
766 | abfd->sections = NULL; | |
767 | abfd->section_tail = &abfd->sections; | |
768 | abfd->section_count = 0; | |
c58b9523 | 769 | memset (abfd->section_htab.table, 0, |
9e7b37b3 AM |
770 | abfd->section_htab.size * sizeof (struct bfd_hash_entry *)); |
771 | } | |
772 | ||
252b5132 RH |
773 | /* |
774 | FUNCTION | |
775 | bfd_get_section_by_name | |
776 | ||
777 | SYNOPSIS | |
c58b9523 | 778 | asection *bfd_get_section_by_name (bfd *abfd, const char *name); |
252b5132 RH |
779 | |
780 | DESCRIPTION | |
781 | Run through @var{abfd} and return the one of the | |
782 | <<asection>>s whose name matches @var{name}, otherwise <<NULL>>. | |
783 | @xref{Sections}, for more information. | |
784 | ||
785 | This should only be used in special cases; the normal way to process | |
786 | all sections of a given name is to use <<bfd_map_over_sections>> and | |
787 | <<strcmp>> on the name (or better yet, base it on the section flags | |
788 | or something else) for each section. | |
789 | */ | |
790 | ||
791 | asection * | |
c58b9523 | 792 | bfd_get_section_by_name (bfd *abfd, const char *name) |
252b5132 | 793 | { |
73e87d70 AM |
794 | struct section_hash_entry *sh; |
795 | ||
b34976b6 | 796 | sh = section_hash_lookup (&abfd->section_htab, name, FALSE, FALSE); |
73e87d70 AM |
797 | if (sh != NULL) |
798 | return &sh->section; | |
252b5132 | 799 | |
252b5132 RH |
800 | return NULL; |
801 | } | |
802 | ||
1bd91689 AM |
803 | /* |
804 | FUNCTION | |
805 | bfd_get_unique_section_name | |
806 | ||
807 | SYNOPSIS | |
c58b9523 AM |
808 | char *bfd_get_unique_section_name |
809 | (bfd *abfd, const char *templat, int *count); | |
1bd91689 AM |
810 | |
811 | DESCRIPTION | |
812 | Invent a section name that is unique in @var{abfd} by tacking | |
77cb06e9 AM |
813 | a dot and a digit suffix onto the original @var{templat}. If |
814 | @var{count} is non-NULL, then it specifies the first number | |
815 | tried as a suffix to generate a unique name. The value | |
816 | pointed to by @var{count} will be incremented in this case. | |
1bd91689 AM |
817 | */ |
818 | ||
819 | char * | |
c58b9523 | 820 | bfd_get_unique_section_name (bfd *abfd, const char *templat, int *count) |
1bd91689 AM |
821 | { |
822 | int num; | |
823 | unsigned int len; | |
824 | char *sname; | |
825 | ||
a966dba9 | 826 | len = strlen (templat); |
c58b9523 | 827 | sname = bfd_malloc (len + 8); |
b3ea3584 AM |
828 | if (sname == NULL) |
829 | return NULL; | |
d4c88bbb | 830 | memcpy (sname, templat, len); |
1bd91689 AM |
831 | num = 1; |
832 | if (count != NULL) | |
833 | num = *count; | |
834 | ||
835 | do | |
836 | { | |
837 | /* If we have a million sections, something is badly wrong. */ | |
838 | if (num > 999999) | |
839 | abort (); | |
77cb06e9 | 840 | sprintf (sname + len, ".%d", num++); |
1bd91689 | 841 | } |
b34976b6 | 842 | while (section_hash_lookup (&abfd->section_htab, sname, FALSE, FALSE)); |
1bd91689 AM |
843 | |
844 | if (count != NULL) | |
845 | *count = num; | |
846 | return sname; | |
847 | } | |
848 | ||
252b5132 RH |
849 | /* |
850 | FUNCTION | |
851 | bfd_make_section_old_way | |
852 | ||
853 | SYNOPSIS | |
c58b9523 | 854 | asection *bfd_make_section_old_way (bfd *abfd, const char *name); |
252b5132 RH |
855 | |
856 | DESCRIPTION | |
857 | Create a new empty section called @var{name} | |
858 | and attach it to the end of the chain of sections for the | |
859 | BFD @var{abfd}. An attempt to create a section with a name which | |
860 | is already in use returns its pointer without changing the | |
861 | section chain. | |
862 | ||
863 | It has the funny name since this is the way it used to be | |
864 | before it was rewritten.... | |
865 | ||
866 | Possible errors are: | |
867 | o <<bfd_error_invalid_operation>> - | |
868 | If output has already started for this BFD. | |
869 | o <<bfd_error_no_memory>> - | |
870 | If memory allocation fails. | |
871 | ||
872 | */ | |
873 | ||
252b5132 | 874 | asection * |
c58b9523 | 875 | bfd_make_section_old_way (bfd *abfd, const char *name) |
252b5132 | 876 | { |
73e87d70 AM |
877 | struct section_hash_entry *sh; |
878 | asection *newsect; | |
879 | ||
880 | if (abfd->output_has_begun) | |
881 | { | |
882 | bfd_set_error (bfd_error_invalid_operation); | |
883 | return NULL; | |
884 | } | |
885 | ||
886 | if (strcmp (name, BFD_ABS_SECTION_NAME) == 0) | |
887 | return bfd_abs_section_ptr; | |
888 | ||
889 | if (strcmp (name, BFD_COM_SECTION_NAME) == 0) | |
890 | return bfd_com_section_ptr; | |
891 | ||
892 | if (strcmp (name, BFD_UND_SECTION_NAME) == 0) | |
893 | return bfd_und_section_ptr; | |
894 | ||
895 | if (strcmp (name, BFD_IND_SECTION_NAME) == 0) | |
896 | return bfd_ind_section_ptr; | |
897 | ||
b34976b6 | 898 | sh = section_hash_lookup (&abfd->section_htab, name, TRUE, FALSE); |
73e87d70 AM |
899 | if (sh == NULL) |
900 | return NULL; | |
901 | ||
902 | newsect = &sh->section; | |
903 | if (newsect->name != NULL) | |
252b5132 | 904 | { |
73e87d70 AM |
905 | /* Section already exists. */ |
906 | return newsect; | |
252b5132 | 907 | } |
73e87d70 AM |
908 | |
909 | newsect->name = name; | |
910 | return bfd_section_init (abfd, newsect); | |
252b5132 RH |
911 | } |
912 | ||
913 | /* | |
914 | FUNCTION | |
915 | bfd_make_section_anyway | |
916 | ||
917 | SYNOPSIS | |
c58b9523 | 918 | asection *bfd_make_section_anyway (bfd *abfd, const char *name); |
252b5132 RH |
919 | |
920 | DESCRIPTION | |
921 | Create a new empty section called @var{name} and attach it to the end of | |
922 | the chain of sections for @var{abfd}. Create a new section even if there | |
923 | is already a section with that name. | |
924 | ||
925 | Return <<NULL>> and set <<bfd_error>> on error; possible errors are: | |
926 | o <<bfd_error_invalid_operation>> - If output has already started for @var{abfd}. | |
927 | o <<bfd_error_no_memory>> - If memory allocation fails. | |
928 | */ | |
929 | ||
930 | sec_ptr | |
c58b9523 | 931 | bfd_make_section_anyway (bfd *abfd, const char *name) |
252b5132 | 932 | { |
73e87d70 | 933 | struct section_hash_entry *sh; |
252b5132 | 934 | asection *newsect; |
252b5132 RH |
935 | |
936 | if (abfd->output_has_begun) | |
937 | { | |
938 | bfd_set_error (bfd_error_invalid_operation); | |
939 | return NULL; | |
940 | } | |
941 | ||
b34976b6 | 942 | sh = section_hash_lookup (&abfd->section_htab, name, TRUE, FALSE); |
73e87d70 | 943 | if (sh == NULL) |
252b5132 RH |
944 | return NULL; |
945 | ||
73e87d70 AM |
946 | newsect = &sh->section; |
947 | if (newsect->name != NULL) | |
4d7ce4dd | 948 | { |
73e87d70 AM |
949 | /* We are making a section of the same name. It can't go in |
950 | section_htab without generating a unique section name and | |
951 | that would be pointless; We don't need to traverse the | |
952 | hash table. */ | |
c58b9523 | 953 | newsect = bfd_zalloc (abfd, sizeof (asection)); |
73e87d70 AM |
954 | if (newsect == NULL) |
955 | return NULL; | |
252b5132 RH |
956 | } |
957 | ||
73e87d70 AM |
958 | newsect->name = name; |
959 | return bfd_section_init (abfd, newsect); | |
252b5132 RH |
960 | } |
961 | ||
962 | /* | |
963 | FUNCTION | |
964 | bfd_make_section | |
965 | ||
966 | SYNOPSIS | |
c58b9523 | 967 | asection *bfd_make_section (bfd *, const char *name); |
252b5132 RH |
968 | |
969 | DESCRIPTION | |
970 | Like <<bfd_make_section_anyway>>, but return <<NULL>> (without calling | |
971 | bfd_set_error ()) without changing the section chain if there is already a | |
972 | section named @var{name}. If there is an error, return <<NULL>> and set | |
973 | <<bfd_error>>. | |
974 | */ | |
975 | ||
976 | asection * | |
c58b9523 | 977 | bfd_make_section (bfd *abfd, const char *name) |
252b5132 | 978 | { |
73e87d70 AM |
979 | struct section_hash_entry *sh; |
980 | asection *newsect; | |
252b5132 | 981 | |
73e87d70 | 982 | if (abfd->output_has_begun) |
252b5132 | 983 | { |
73e87d70 AM |
984 | bfd_set_error (bfd_error_invalid_operation); |
985 | return NULL; | |
252b5132 RH |
986 | } |
987 | ||
73e87d70 AM |
988 | if (strcmp (name, BFD_ABS_SECTION_NAME) == 0 |
989 | || strcmp (name, BFD_COM_SECTION_NAME) == 0 | |
990 | || strcmp (name, BFD_UND_SECTION_NAME) == 0 | |
991 | || strcmp (name, BFD_IND_SECTION_NAME) == 0) | |
992 | return NULL; | |
252b5132 | 993 | |
b34976b6 | 994 | sh = section_hash_lookup (&abfd->section_htab, name, TRUE, FALSE); |
73e87d70 AM |
995 | if (sh == NULL) |
996 | return NULL; | |
997 | ||
998 | newsect = &sh->section; | |
999 | if (newsect->name != NULL) | |
252b5132 | 1000 | { |
73e87d70 | 1001 | /* Section already exists. */ |
003d627e | 1002 | return NULL; |
252b5132 RH |
1003 | } |
1004 | ||
73e87d70 AM |
1005 | newsect->name = name; |
1006 | return bfd_section_init (abfd, newsect); | |
252b5132 RH |
1007 | } |
1008 | ||
252b5132 RH |
1009 | /* |
1010 | FUNCTION | |
1011 | bfd_set_section_flags | |
1012 | ||
1013 | SYNOPSIS | |
c58b9523 AM |
1014 | bfd_boolean bfd_set_section_flags |
1015 | (bfd *abfd, asection *sec, flagword flags); | |
252b5132 RH |
1016 | |
1017 | DESCRIPTION | |
1018 | Set the attributes of the section @var{sec} in the BFD | |
b34976b6 AM |
1019 | @var{abfd} to the value @var{flags}. Return <<TRUE>> on success, |
1020 | <<FALSE>> on error. Possible error returns are: | |
252b5132 RH |
1021 | |
1022 | o <<bfd_error_invalid_operation>> - | |
1023 | The section cannot have one or more of the attributes | |
1024 | requested. For example, a .bss section in <<a.out>> may not | |
1025 | have the <<SEC_HAS_CONTENTS>> field set. | |
1026 | ||
1027 | */ | |
1028 | ||
1029 | /*ARGSUSED*/ | |
b34976b6 | 1030 | bfd_boolean |
c58b9523 AM |
1031 | bfd_set_section_flags (bfd *abfd ATTRIBUTE_UNUSED, |
1032 | sec_ptr section, | |
1033 | flagword flags) | |
252b5132 RH |
1034 | { |
1035 | #if 0 | |
1036 | /* If you try to copy a text section from an input file (where it | |
1037 | has the SEC_CODE flag set) to an output file, this loses big if | |
1038 | the bfd_applicable_section_flags (abfd) doesn't have the SEC_CODE | |
1039 | set - which it doesn't, at least not for a.out. FIXME */ | |
1040 | ||
1041 | if ((flags & bfd_applicable_section_flags (abfd)) != flags) | |
1042 | { | |
1043 | bfd_set_error (bfd_error_invalid_operation); | |
b34976b6 | 1044 | return FALSE; |
252b5132 RH |
1045 | } |
1046 | #endif | |
1047 | ||
1048 | section->flags = flags; | |
b34976b6 | 1049 | return TRUE; |
252b5132 RH |
1050 | } |
1051 | ||
252b5132 RH |
1052 | /* |
1053 | FUNCTION | |
1054 | bfd_map_over_sections | |
1055 | ||
1056 | SYNOPSIS | |
c58b9523 AM |
1057 | void bfd_map_over_sections |
1058 | (bfd *abfd, | |
1059 | void (*func) (bfd *abfd, asection *sect, void *obj), | |
1060 | void *obj); | |
252b5132 RH |
1061 | |
1062 | DESCRIPTION | |
1063 | Call the provided function @var{func} for each section | |
1064 | attached to the BFD @var{abfd}, passing @var{obj} as an | |
1065 | argument. The function will be called as if by | |
1066 | ||
c58b9523 | 1067 | | func (abfd, the_section, obj); |
252b5132 RH |
1068 | |
1069 | This is the prefered method for iterating over sections; an | |
1070 | alternative would be to use a loop: | |
1071 | ||
1072 | | section *p; | |
1073 | | for (p = abfd->sections; p != NULL; p = p->next) | |
c58b9523 | 1074 | | func (abfd, p, ...) |
252b5132 | 1075 | |
252b5132 RH |
1076 | */ |
1077 | ||
1078 | /*VARARGS2*/ | |
1079 | void | |
c58b9523 AM |
1080 | bfd_map_over_sections (bfd *abfd, |
1081 | void (*operation) (bfd *, asection *, void *), | |
1082 | void *user_storage) | |
252b5132 RH |
1083 | { |
1084 | asection *sect; | |
1085 | unsigned int i = 0; | |
1086 | ||
1087 | for (sect = abfd->sections; sect != NULL; i++, sect = sect->next) | |
1088 | (*operation) (abfd, sect, user_storage); | |
1089 | ||
1090 | if (i != abfd->section_count) /* Debugging */ | |
1091 | abort (); | |
1092 | } | |
1093 | ||
252b5132 RH |
1094 | /* |
1095 | FUNCTION | |
1096 | bfd_set_section_size | |
1097 | ||
1098 | SYNOPSIS | |
c58b9523 AM |
1099 | bfd_boolean bfd_set_section_size |
1100 | (bfd *abfd, asection *sec, bfd_size_type val); | |
252b5132 RH |
1101 | |
1102 | DESCRIPTION | |
1103 | Set @var{sec} to the size @var{val}. If the operation is | |
b34976b6 | 1104 | ok, then <<TRUE>> is returned, else <<FALSE>>. |
252b5132 RH |
1105 | |
1106 | Possible error returns: | |
1107 | o <<bfd_error_invalid_operation>> - | |
1108 | Writing has started to the BFD, so setting the size is invalid. | |
1109 | ||
1110 | */ | |
1111 | ||
b34976b6 | 1112 | bfd_boolean |
c58b9523 | 1113 | bfd_set_section_size (bfd *abfd, sec_ptr ptr, bfd_size_type val) |
252b5132 RH |
1114 | { |
1115 | /* Once you've started writing to any section you cannot create or change | |
7b82c249 | 1116 | the size of any others. */ |
252b5132 RH |
1117 | |
1118 | if (abfd->output_has_begun) | |
1119 | { | |
1120 | bfd_set_error (bfd_error_invalid_operation); | |
b34976b6 | 1121 | return FALSE; |
252b5132 RH |
1122 | } |
1123 | ||
1124 | ptr->_cooked_size = val; | |
1125 | ptr->_raw_size = val; | |
1126 | ||
b34976b6 | 1127 | return TRUE; |
252b5132 RH |
1128 | } |
1129 | ||
1130 | /* | |
1131 | FUNCTION | |
1132 | bfd_set_section_contents | |
1133 | ||
1134 | SYNOPSIS | |
c58b9523 AM |
1135 | bfd_boolean bfd_set_section_contents |
1136 | (bfd *abfd, asection *section, void *data, file_ptr offset, | |
1137 | bfd_size_type count); | |
252b5132 | 1138 | |
252b5132 RH |
1139 | DESCRIPTION |
1140 | Sets the contents of the section @var{section} in BFD | |
1141 | @var{abfd} to the data starting in memory at @var{data}. The | |
1142 | data is written to the output section starting at offset | |
9a968f43 | 1143 | @var{offset} for @var{count} octets. |
252b5132 | 1144 | |
b34976b6 | 1145 | Normally <<TRUE>> is returned, else <<FALSE>>. Possible error |
252b5132 RH |
1146 | returns are: |
1147 | o <<bfd_error_no_contents>> - | |
1148 | The output section does not have the <<SEC_HAS_CONTENTS>> | |
1149 | attribute, so nothing can be written to it. | |
1150 | o and some more too | |
1151 | ||
1152 | This routine is front end to the back end function | |
1153 | <<_bfd_set_section_contents>>. | |
1154 | ||
252b5132 RH |
1155 | */ |
1156 | ||
c58b9523 AM |
1157 | #define bfd_get_section_size_now(abfd, sec) \ |
1158 | (sec->reloc_done \ | |
1159 | ? bfd_get_section_size_after_reloc (sec) \ | |
1160 | : bfd_get_section_size_before_reloc (sec)) | |
252b5132 | 1161 | |
b34976b6 | 1162 | bfd_boolean |
c58b9523 AM |
1163 | bfd_set_section_contents (bfd *abfd, |
1164 | sec_ptr section, | |
1165 | void *location, | |
1166 | file_ptr offset, | |
1167 | bfd_size_type count) | |
252b5132 RH |
1168 | { |
1169 | bfd_size_type sz; | |
1170 | ||
1171 | if (!(bfd_get_section_flags (abfd, section) & SEC_HAS_CONTENTS)) | |
1172 | { | |
1173 | bfd_set_error (bfd_error_no_contents); | |
b34976b6 | 1174 | return FALSE; |
252b5132 RH |
1175 | } |
1176 | ||
dc810e39 AM |
1177 | sz = bfd_get_section_size_now (abfd, section); |
1178 | if ((bfd_size_type) offset > sz | |
1179 | || count > sz | |
1180 | || offset + count > sz | |
1181 | || count != (size_t) count) | |
252b5132 | 1182 | { |
252b5132 | 1183 | bfd_set_error (bfd_error_bad_value); |
b34976b6 | 1184 | return FALSE; |
252b5132 | 1185 | } |
252b5132 RH |
1186 | |
1187 | switch (abfd->direction) | |
1188 | { | |
1189 | case read_direction: | |
1190 | case no_direction: | |
1191 | bfd_set_error (bfd_error_invalid_operation); | |
b34976b6 | 1192 | return FALSE; |
252b5132 RH |
1193 | |
1194 | case write_direction: | |
1195 | break; | |
1196 | ||
1197 | case both_direction: | |
1198 | /* File is opened for update. `output_has_begun' some time ago when | |
1199 | the file was created. Do not recompute sections sizes or alignments | |
1200 | in _bfd_set_section_content. */ | |
b34976b6 | 1201 | abfd->output_has_begun = TRUE; |
252b5132 RH |
1202 | break; |
1203 | } | |
1204 | ||
9a951beb RH |
1205 | /* Record a copy of the data in memory if desired. */ |
1206 | if (section->contents | |
c58b9523 | 1207 | && location != section->contents + offset) |
dc810e39 | 1208 | memcpy (section->contents + offset, location, (size_t) count); |
9a951beb | 1209 | |
252b5132 RH |
1210 | if (BFD_SEND (abfd, _bfd_set_section_contents, |
1211 | (abfd, section, location, offset, count))) | |
1212 | { | |
b34976b6 AM |
1213 | abfd->output_has_begun = TRUE; |
1214 | return TRUE; | |
252b5132 RH |
1215 | } |
1216 | ||
b34976b6 | 1217 | return FALSE; |
252b5132 RH |
1218 | } |
1219 | ||
1220 | /* | |
1221 | FUNCTION | |
1222 | bfd_get_section_contents | |
1223 | ||
1224 | SYNOPSIS | |
c58b9523 AM |
1225 | bfd_boolean bfd_get_section_contents |
1226 | (bfd *abfd, asection *section, void *location, file_ptr offset, | |
1227 | bfd_size_type count); | |
252b5132 RH |
1228 | |
1229 | DESCRIPTION | |
1230 | Read data from @var{section} in BFD @var{abfd} | |
1231 | into memory starting at @var{location}. The data is read at an | |
1232 | offset of @var{offset} from the start of the input section, | |
1233 | and is read for @var{count} bytes. | |
1234 | ||
1235 | If the contents of a constructor with the <<SEC_CONSTRUCTOR>> | |
1236 | flag set are requested or if the section does not have the | |
1237 | <<SEC_HAS_CONTENTS>> flag set, then the @var{location} is filled | |
b34976b6 AM |
1238 | with zeroes. If no errors occur, <<TRUE>> is returned, else |
1239 | <<FALSE>>. | |
252b5132 | 1240 | |
252b5132 | 1241 | */ |
b34976b6 | 1242 | bfd_boolean |
c58b9523 AM |
1243 | bfd_get_section_contents (bfd *abfd, |
1244 | sec_ptr section, | |
1245 | void *location, | |
1246 | file_ptr offset, | |
1247 | bfd_size_type count) | |
252b5132 RH |
1248 | { |
1249 | bfd_size_type sz; | |
1250 | ||
1251 | if (section->flags & SEC_CONSTRUCTOR) | |
1252 | { | |
dc810e39 | 1253 | memset (location, 0, (size_t) count); |
b34976b6 | 1254 | return TRUE; |
252b5132 RH |
1255 | } |
1256 | ||
b34976b6 | 1257 | /* Even if reloc_done is TRUE, this function reads unrelocated |
dc810e39 AM |
1258 | contents, so we want the raw size. */ |
1259 | sz = section->_raw_size; | |
1260 | if ((bfd_size_type) offset > sz | |
1261 | || count > sz | |
1262 | || offset + count > sz | |
1263 | || count != (size_t) count) | |
252b5132 | 1264 | { |
252b5132 | 1265 | bfd_set_error (bfd_error_bad_value); |
b34976b6 | 1266 | return FALSE; |
252b5132 | 1267 | } |
252b5132 RH |
1268 | |
1269 | if (count == 0) | |
1270 | /* Don't bother. */ | |
b34976b6 | 1271 | return TRUE; |
252b5132 RH |
1272 | |
1273 | if ((section->flags & SEC_HAS_CONTENTS) == 0) | |
1274 | { | |
dc810e39 | 1275 | memset (location, 0, (size_t) count); |
b34976b6 | 1276 | return TRUE; |
252b5132 RH |
1277 | } |
1278 | ||
1279 | if ((section->flags & SEC_IN_MEMORY) != 0) | |
1280 | { | |
1281 | memcpy (location, section->contents + offset, (size_t) count); | |
b34976b6 | 1282 | return TRUE; |
252b5132 RH |
1283 | } |
1284 | ||
1285 | return BFD_SEND (abfd, _bfd_get_section_contents, | |
1286 | (abfd, section, location, offset, count)); | |
1287 | } | |
1288 | ||
1289 | /* | |
1290 | FUNCTION | |
1291 | bfd_copy_private_section_data | |
1292 | ||
1293 | SYNOPSIS | |
c58b9523 AM |
1294 | bfd_boolean bfd_copy_private_section_data |
1295 | (bfd *ibfd, asection *isec, bfd *obfd, asection *osec); | |
252b5132 RH |
1296 | |
1297 | DESCRIPTION | |
1298 | Copy private section information from @var{isec} in the BFD | |
1299 | @var{ibfd} to the section @var{osec} in the BFD @var{obfd}. | |
b34976b6 | 1300 | Return <<TRUE>> on success, <<FALSE>> on error. Possible error |
252b5132 RH |
1301 | returns are: |
1302 | ||
1303 | o <<bfd_error_no_memory>> - | |
1304 | Not enough memory exists to create private data for @var{osec}. | |
1305 | ||
1306 | .#define bfd_copy_private_section_data(ibfd, isection, obfd, osection) \ | |
1307 | . BFD_SEND (obfd, _bfd_copy_private_section_data, \ | |
1308 | . (ibfd, isection, obfd, osection)) | |
1309 | */ | |
1310 | ||
1311 | /* | |
1312 | FUNCTION | |
1313 | _bfd_strip_section_from_output | |
1314 | ||
1315 | SYNOPSIS | |
1316 | void _bfd_strip_section_from_output | |
c58b9523 | 1317 | (struct bfd_link_info *info, asection *section); |
252b5132 RH |
1318 | |
1319 | DESCRIPTION | |
7f8d5fc9 | 1320 | Remove @var{section} from the output. If the output section |
bc0ba537 AM |
1321 | becomes empty, remove it from the output bfd. |
1322 | ||
1323 | This function won't actually do anything except twiddle flags | |
1324 | if called too late in the linking process, when it's not safe | |
1325 | to remove sections. | |
252b5132 RH |
1326 | */ |
1327 | void | |
c58b9523 | 1328 | _bfd_strip_section_from_output (struct bfd_link_info *info, asection *s) |
252b5132 | 1329 | { |
bc0ba537 AM |
1330 | asection *os; |
1331 | asection *is; | |
1332 | bfd *abfd; | |
252b5132 | 1333 | |
bc0ba537 | 1334 | s->flags |= SEC_EXCLUDE; |
7f8d5fc9 | 1335 | |
bc0ba537 AM |
1336 | /* If the section wasn't assigned to an output section, or the |
1337 | section has been discarded by the linker script, there's nothing | |
1338 | more to do. */ | |
252b5132 | 1339 | os = s->output_section; |
bc0ba537 | 1340 | if (os == NULL || os->owner == NULL) |
2f484710 HPN |
1341 | return; |
1342 | ||
bc0ba537 AM |
1343 | /* If the output section has other (non-excluded) input sections, we |
1344 | can't remove it. */ | |
1345 | for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next) | |
1346 | for (is = abfd->sections; is != NULL; is = is->next) | |
1347 | if (is->output_section == os && (is->flags & SEC_EXCLUDE) == 0) | |
1348 | return; | |
7f8d5fc9 | 1349 | |
bc0ba537 AM |
1350 | /* If the output section is empty, flag it for removal too. |
1351 | See ldlang.c:strip_excluded_output_sections for the action. */ | |
1352 | os->flags |= SEC_EXCLUDE; | |
252b5132 | 1353 | } |
b885599b AM |
1354 | |
1355 | /* | |
1356 | FUNCTION | |
e61463e1 | 1357 | bfd_generic_discard_group |
b885599b AM |
1358 | |
1359 | SYNOPSIS | |
b34976b6 | 1360 | bfd_boolean bfd_generic_discard_group (bfd *abfd, asection *group); |
b885599b AM |
1361 | |
1362 | DESCRIPTION | |
1363 | Remove all members of @var{group} from the output. | |
1364 | */ | |
1365 | ||
b34976b6 | 1366 | bfd_boolean |
c58b9523 AM |
1367 | bfd_generic_discard_group (bfd *abfd ATTRIBUTE_UNUSED, |
1368 | asection *group ATTRIBUTE_UNUSED) | |
b885599b | 1369 | { |
b34976b6 | 1370 | return TRUE; |
b885599b | 1371 | } |