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6724ff46 | 1 | /* Object file "section" support for the BFD library. |
21c77703 | 2 | Copyright (C) 1990, 1991, 1992, 1993 Free Software Foundation, Inc. |
6724ff46 RP |
3 | Written by Cygnus Support. |
4 | ||
5 | This file is part of BFD, the Binary File Descriptor library. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
20 | ||
4a96bc04 SC |
21 | /* |
22 | SECTION | |
23 | Sections | |
985fca12 | 24 | |
4a96bc04 SC |
25 | The raw data contained within a BFD is maintained through the |
26 | section abstraction. A single BFD may have any number of | |
c188b0be | 27 | sections. It keeps hold of them by pointing to the first; |
4a96bc04 | 28 | each one points to the next in the list. |
985fca12 | 29 | |
c188b0be DM |
30 | Sections are supported in BFD in <<section.c>>. |
31 | ||
985fca12 | 32 | @menu |
151760d0 RP |
33 | @* Section Input:: |
34 | @* Section Output:: | |
35 | @* typedef asection:: | |
36 | @* section prototypes:: | |
985fca12 SC |
37 | @end menu |
38 | ||
fefb4b30 JG |
39 | INODE |
40 | Section Input, Section Output, Sections, Sections | |
4a96bc04 SC |
41 | SUBSECTION |
42 | Section Input | |
43 | ||
44 | When a BFD is opened for reading, the section structures are | |
45 | created and attached to the BFD. | |
46 | ||
47 | Each section has a name which describes the section in the | |
c188b0be | 48 | outside world---for example, <<a.out>> would contain at least |
4a96bc04 SC |
49 | three sections, called <<.text>>, <<.data>> and <<.bss>>. |
50 | ||
c188b0be DM |
51 | Names need not be unique; for example a COFF file may have several |
52 | sections named <<.data>>. | |
53 | ||
54 | Sometimes a BFD will contain more than the ``natural'' number of | |
4a96bc04 SC |
55 | sections. A back end may attach other sections containing |
56 | constructor data, or an application may add a section (using | |
c188b0be DM |
57 | <<bfd_make_section>>) to the sections attached to an already open |
58 | BFD. For example, the linker creates an extra section | |
4a96bc04 SC |
59 | <<COMMON>> for each input file's BFD to hold information about |
60 | common storage. | |
61 | ||
c188b0be | 62 | The raw data is not necessarily read in when |
4a96bc04 SC |
63 | the section descriptor is created. Some targets may leave the |
64 | data in place until a <<bfd_get_section_contents>> call is | |
c188b0be DM |
65 | made. Other back ends may read in all the data at once. For |
66 | example, an S-record file has to be read once to determine the | |
4a96bc04 SC |
67 | size of the data. An IEEE-695 file doesn't contain raw data in |
68 | sections, but data and relocation expressions intermixed, so | |
69 | the data area has to be parsed to get out the data and | |
70 | relocations. | |
71 | ||
fefb4b30 JG |
72 | INODE |
73 | Section Output, typedef asection, Section Input, Sections | |
4a96bc04 SC |
74 | |
75 | SUBSECTION | |
76 | Section Output | |
77 | ||
78 | To write a new object style BFD, the various sections to be | |
79 | written have to be created. They are attached to the BFD in | |
c188b0be | 80 | the same way as input sections; data is written to the |
4a96bc04 SC |
81 | sections using <<bfd_set_section_contents>>. |
82 | ||
fefb4b30 | 83 | Any program that creates or combines sections (e.g., the assembler |
c188b0be | 84 | and linker) must use the <<asection>> fields <<output_section>> and |
fefb4b30 JG |
85 | <<output_offset>> to indicate the file sections to which each |
86 | section must be written. (If the section is being created from | |
87 | scratch, <<output_section>> should probably point to the section | |
c188b0be | 88 | itself and <<output_offset>> should probably be zero.) |
4a96bc04 | 89 | |
c188b0be DM |
90 | The data to be written comes from input sections attached |
91 | (via <<output_section>> pointers) to | |
4a96bc04 | 92 | the output sections. The output section structure can be |
c188b0be | 93 | considered a filter for the input section: the output section |
4a96bc04 SC |
94 | determines the vma of the output data and the name, but the |
95 | input section determines the offset into the output section of | |
96 | the data to be written. | |
97 | ||
fefb4b30 | 98 | E.g., to create a section "O", starting at 0x100, 0x123 long, |
c188b0be DM |
99 | containing two subsections, "A" at offset 0x0 (i.e., at vma |
100 | 0x100) and "B" at offset 0x20 (i.e., at vma 0x120) the <<asection>> | |
101 | structures would look like: | |
4a96bc04 SC |
102 | |
103 | | section name "A" | |
104 | | output_offset 0x00 | |
105 | | size 0x20 | |
106 | | output_section -----------> section name "O" | |
107 | | | vma 0x100 | |
108 | | section name "B" | size 0x123 | |
109 | | output_offset 0x20 | | |
110 | | size 0x103 | | |
111 | | output_section --------| | |
112 | ||
985fca12 | 113 | |
e98e6ec1 | 114 | SUBSECTION |
c188b0be | 115 | Seclets |
e98e6ec1 | 116 | |
c188b0be DM |
117 | The data within a section is stored in a <<seclet>>. These |
118 | are much like the fixups in <<gas>>. The seclet abstraction | |
119 | allows a section to grow and shrink within itself. | |
e98e6ec1 | 120 | |
c188b0be DM |
121 | A seclet knows how big it is, and which is the next seclet and |
122 | where the raw data for it is; it also points to a list of | |
e98e6ec1 SC |
123 | relocations which apply to it. |
124 | ||
c188b0be DM |
125 | The seclet is used by the linker to perform relaxing on final |
126 | code. The compiler creates code which is as big as | |
e98e6ec1 SC |
127 | necessary to make it work without relaxing, and the user can |
128 | select whether to relax. Sometimes relaxing takes a lot of | |
129 | time. The linker runs around the relocations to see if any | |
130 | are attached to data which can be shrunk, if so it does it on | |
c188b0be | 131 | a seclet by seclet basis. |
e98e6ec1 | 132 | |
985fca12 SC |
133 | */ |
134 | ||
135 | ||
985fca12 | 136 | #include "bfd.h" |
cbdc7909 | 137 | #include "sysdep.h" |
985fca12 SC |
138 | #include "libbfd.h" |
139 | ||
4a96bc04 | 140 | |
fefb4b30 JG |
141 | /* |
142 | DOCDD | |
143 | INODE | |
144 | typedef asection, section prototypes, Section Output, Sections | |
4a96bc04 SC |
145 | SUBSECTION |
146 | typedef asection | |
147 | ||
c188b0be | 148 | Here is the section structure: |
4a96bc04 SC |
149 | |
150 | CODE_FRAGMENT | |
151 | . | |
152 | .typedef struct sec | |
153 | .{ | |
c188b0be | 154 | . {* The name of the section; the name isn't a copy, the pointer is |
4a96bc04 SC |
155 | . the same as that passed to bfd_make_section. *} |
156 | . | |
157 | . CONST char *name; | |
158 | . | |
c188b0be | 159 | . {* Which section is it; 0..nth. *} |
e98e6ec1 SC |
160 | . |
161 | . int index; | |
162 | . | |
4a96bc04 SC |
163 | . {* The next section in the list belonging to the BFD, or NULL. *} |
164 | . | |
165 | . struct sec *next; | |
166 | . | |
c188b0be | 167 | . {* The field flags contains attributes of the section. Some |
4a96bc04 SC |
168 | . flags are read in from the object file, and some are |
169 | . synthesized from other information. *} | |
170 | . | |
171 | . flagword flags; | |
172 | . | |
173 | .#define SEC_NO_FLAGS 0x000 | |
174 | . | |
c188b0be DM |
175 | . {* Tells the OS to allocate space for this section when loading. |
176 | . This is clear for a section containing debug information | |
4a96bc04 | 177 | . only. *} |
4a96bc04 | 178 | .#define SEC_ALLOC 0x001 |
a8a4b6b5 | 179 | . |
4a96bc04 | 180 | . {* Tells the OS to load the section from the file when loading. |
c188b0be | 181 | . This is clear for a .bss section. *} |
4a96bc04 | 182 | .#define SEC_LOAD 0x002 |
a8a4b6b5 | 183 | . |
c188b0be DM |
184 | . {* The section contains data still to be relocated, so there is |
185 | . some relocation information too. *} | |
4a96bc04 SC |
186 | .#define SEC_RELOC 0x004 |
187 | . | |
a8a4b6b5 | 188 | .#if 0 {* Obsolete ? *} |
4a96bc04 | 189 | .#define SEC_BALIGN 0x008 |
a8a4b6b5 | 190 | .#endif |
4a96bc04 SC |
191 | . |
192 | . {* A signal to the OS that the section contains read only | |
193 | . data. *} | |
194 | .#define SEC_READONLY 0x010 | |
195 | . | |
196 | . {* The section contains code only. *} | |
4a96bc04 SC |
197 | .#define SEC_CODE 0x020 |
198 | . | |
199 | . {* The section contains data only. *} | |
a8a4b6b5 | 200 | .#define SEC_DATA 0x040 |
4a96bc04 SC |
201 | . |
202 | . {* The section will reside in ROM. *} | |
4a96bc04 SC |
203 | .#define SEC_ROM 0x080 |
204 | . | |
205 | . {* The section contains constructor information. This section | |
206 | . type is used by the linker to create lists of constructors and | |
207 | . destructors used by <<g++>>. When a back end sees a symbol | |
208 | . which should be used in a constructor list, it creates a new | |
c188b0be DM |
209 | . section for the type of name (e.g., <<__CTOR_LIST__>>), attaches |
210 | . the symbol to it, and builds a relocation. To build the lists | |
211 | . of constructors, all the linker has to do is catenate all the | |
212 | . sections called <<__CTOR_LIST__>> and relocate the data | |
4a96bc04 SC |
213 | . contained within - exactly the operations it would peform on |
214 | . standard data. *} | |
4a96bc04 SC |
215 | .#define SEC_CONSTRUCTOR 0x100 |
216 | . | |
217 | . {* The section is a constuctor, and should be placed at the | |
a8a4b6b5 | 218 | . end of the text, data, or bss section(?). *} |
4a96bc04 | 219 | .#define SEC_CONSTRUCTOR_TEXT 0x1100 |
4a96bc04 | 220 | .#define SEC_CONSTRUCTOR_DATA 0x2100 |
4a96bc04 SC |
221 | .#define SEC_CONSTRUCTOR_BSS 0x3100 |
222 | . | |
21c77703 | 223 | . {* The section has contents - a data section could be |
c188b0be | 224 | . <<SEC_ALLOC>> | <<SEC_HAS_CONTENTS>>; a debug section could be |
4a96bc04 | 225 | . <<SEC_HAS_CONTENTS>> *} |
4a96bc04 SC |
226 | .#define SEC_HAS_CONTENTS 0x200 |
227 | . | |
c188b0be DM |
228 | . {* An instruction to the linker to not output the section |
229 | . even if it has information which would normally be written. *} | |
4a96bc04 SC |
230 | .#define SEC_NEVER_LOAD 0x400 |
231 | . | |
21c77703 SC |
232 | . {* The section is a shared library section. The linker must leave |
233 | . these completely alone, as the vma and size are used when | |
234 | . the executable is loaded. *} | |
21c77703 SC |
235 | .#define SEC_SHARED_LIBRARY 0x800 |
236 | . | |
237 | . {* The section is a common section (symbols may be defined | |
238 | . multiple times, the value of a symbol is the amount of | |
239 | . space it requires, and the largest symbol value is the one | |
a8a4b6b5 KR |
240 | . used). Most targets have exactly one of these (which we |
241 | . translate to bfd_com_section), but ECOFF has two. *} | |
21c77703 | 242 | .#define SEC_IS_COMMON 0x8000 |
a8a4b6b5 | 243 | . |
c188b0be DM |
244 | . {* The section contains only debugging information. For |
245 | . example, this is set for ELF .debug and .stab sections. | |
246 | . strip tests this flag to see if a section can be | |
247 | . discarded. *} | |
248 | .#define SEC_DEBUGGING 0x10000 | |
249 | . | |
a8a4b6b5 KR |
250 | . {* End of section flags. *} |
251 | . | |
252 | . {* The virtual memory address of the section - where it will be | |
253 | . at run time. The symbols are relocated against this. The | |
254 | . user_set_vma flag is maintained by bfd; if it's not set, the | |
255 | . backend can assign addresses (for example, in <<a.out>>, where | |
256 | . the default address for <<.data>> is dependent on the specific | |
257 | . target and various flags). *} | |
258 | . | |
4a96bc04 | 259 | . bfd_vma vma; |
fefb4b30 | 260 | . boolean user_set_vma; |
4a96bc04 | 261 | . |
a8a4b6b5 | 262 | . {* The load address of the section - where it would be in a |
c188b0be | 263 | . rom image; really only used for writing section header |
a8a4b6b5 KR |
264 | . information. *} |
265 | . | |
266 | . bfd_vma lma; | |
267 | . | |
e98e6ec1 | 268 | . {* The size of the section in bytes, as it will be output. |
c188b0be | 269 | . contains a value even if the section has no contents (e.g., the |
e98e6ec1 SC |
270 | . size of <<.bss>>). This will be filled in after relocation *} |
271 | . | |
272 | . bfd_size_type _cooked_size; | |
273 | . | |
c188b0be | 274 | . {* The original size on disk of the section, in bytes. Normally this |
e98e6ec1 SC |
275 | . value is the same as the size, but if some relaxing has |
276 | . been done, then this value will be bigger. *} | |
4a96bc04 | 277 | . |
e98e6ec1 | 278 | . bfd_size_type _raw_size; |
4a96bc04 SC |
279 | . |
280 | . {* If this section is going to be output, then this value is the | |
281 | . offset into the output section of the first byte in the input | |
c188b0be | 282 | . section. E.g., if this was going to start at the 100th byte in |
4a96bc04 SC |
283 | . the output section, this value would be 100. *} |
284 | . | |
285 | . bfd_vma output_offset; | |
286 | . | |
287 | . {* The output section through which to map on output. *} | |
288 | . | |
289 | . struct sec *output_section; | |
290 | . | |
c188b0be DM |
291 | . {* The alignment requirement of the section, as an exponent of 2 - |
292 | . e.g., 3 aligns to 2^3 (or 8). *} | |
4a96bc04 SC |
293 | . |
294 | . unsigned int alignment_power; | |
295 | . | |
296 | . {* If an input section, a pointer to a vector of relocation | |
297 | . records for the data in this section. *} | |
298 | . | |
299 | . struct reloc_cache_entry *relocation; | |
300 | . | |
301 | . {* If an output section, a pointer to a vector of pointers to | |
302 | . relocation records for the data in this section. *} | |
303 | . | |
304 | . struct reloc_cache_entry **orelocation; | |
305 | . | |
306 | . {* The number of relocation records in one of the above *} | |
307 | . | |
308 | . unsigned reloc_count; | |
309 | . | |
4a96bc04 | 310 | . {* Information below is back end specific - and not always used |
a8a4b6b5 | 311 | . or updated. *} |
4a96bc04 | 312 | . |
a8a4b6b5 | 313 | . {* File position of section data *} |
4a96bc04 SC |
314 | . |
315 | . file_ptr filepos; | |
316 | . | |
317 | . {* File position of relocation info *} | |
318 | . | |
319 | . file_ptr rel_filepos; | |
320 | . | |
321 | . {* File position of line data *} | |
322 | . | |
323 | . file_ptr line_filepos; | |
324 | . | |
325 | . {* Pointer to data for applications *} | |
326 | . | |
327 | . PTR userdata; | |
328 | . | |
329 | . struct lang_output_section *otheruserdata; | |
330 | . | |
331 | . {* Attached line number information *} | |
332 | . | |
333 | . alent *lineno; | |
334 | . | |
335 | . {* Number of line number records *} | |
336 | . | |
337 | . unsigned int lineno_count; | |
338 | . | |
339 | . {* When a section is being output, this value changes as more | |
340 | . linenumbers are written out *} | |
341 | . | |
342 | . file_ptr moving_line_filepos; | |
343 | . | |
c188b0be | 344 | . {* What the section number is in the target world *} |
4a96bc04 | 345 | . |
e98e6ec1 | 346 | . int target_index; |
4a96bc04 SC |
347 | . |
348 | . PTR used_by_bfd; | |
349 | . | |
350 | . {* If this is a constructor section then here is a list of the | |
351 | . relocations created to relocate items within it. *} | |
352 | . | |
353 | . struct relent_chain *constructor_chain; | |
354 | . | |
355 | . {* The BFD which owns the section. *} | |
356 | . | |
357 | . bfd *owner; | |
358 | . | |
e98e6ec1 SC |
359 | . boolean reloc_done; |
360 | . {* A symbol which points at this section only *} | |
361 | . struct symbol_cache_entry *symbol; | |
362 | . struct symbol_cache_entry **symbol_ptr_ptr; | |
a8a4b6b5 | 363 | . |
990e7c22 JG |
364 | . struct bfd_seclet *seclets_head; |
365 | . struct bfd_seclet *seclets_tail; | |
4a96bc04 | 366 | .} asection ; |
e98e6ec1 SC |
367 | . |
368 | . | |
a8a4b6b5 KR |
369 | . {* These sections are global, and are managed by BFD. The application |
370 | . and target back end are not permitted to change the values in | |
371 | . these sections. *} | |
e98e6ec1 SC |
372 | .#define BFD_ABS_SECTION_NAME "*ABS*" |
373 | .#define BFD_UND_SECTION_NAME "*UND*" | |
374 | .#define BFD_COM_SECTION_NAME "*COM*" | |
21c77703 | 375 | .#define BFD_IND_SECTION_NAME "*IND*" |
e98e6ec1 SC |
376 | . |
377 | . {* the absolute section *} | |
a8a4b6b5 | 378 | .extern asection bfd_abs_section; |
e98e6ec1 | 379 | . {* Pointer to the undefined section *} |
a8a4b6b5 | 380 | .extern asection bfd_und_section; |
e98e6ec1 | 381 | . {* Pointer to the common section *} |
a8a4b6b5 | 382 | .extern asection bfd_com_section; |
21c77703 | 383 | . {* Pointer to the indirect section *} |
a8a4b6b5 | 384 | .extern asection bfd_ind_section; |
e98e6ec1 | 385 | . |
a8a4b6b5 KR |
386 | .extern struct symbol_cache_entry *bfd_abs_symbol; |
387 | .extern struct symbol_cache_entry *bfd_com_symbol; | |
388 | .extern struct symbol_cache_entry *bfd_und_symbol; | |
389 | .extern struct symbol_cache_entry *bfd_ind_symbol; | |
e98e6ec1 SC |
390 | .#define bfd_get_section_size_before_reloc(section) \ |
391 | . (section->reloc_done ? (abort(),1): (section)->_raw_size) | |
392 | .#define bfd_get_section_size_after_reloc(section) \ | |
393 | . ((section->reloc_done) ? (section)->_cooked_size: (abort(),1)) | |
985fca12 SC |
394 | */ |
395 | ||
fefb4b30 JG |
396 | /* These symbols are global, not specific to any BFD. Therefore, anything |
397 | that tries to change them is broken, and should be repaired. */ | |
398 | static CONST asymbol global_syms[] = { | |
21c77703 | 399 | /* the_bfd, name, value, attr, section [, udata] */ |
fefb4b30 JG |
400 | { 0, BFD_COM_SECTION_NAME, 0, BSF_SECTION_SYM, &bfd_com_section }, |
401 | { 0, BFD_UND_SECTION_NAME, 0, BSF_SECTION_SYM, &bfd_und_section }, | |
402 | { 0, BFD_ABS_SECTION_NAME, 0, BSF_SECTION_SYM, &bfd_abs_section }, | |
21c77703 | 403 | { 0, BFD_IND_SECTION_NAME, 0, BSF_SECTION_SYM, &bfd_ind_section }, |
fefb4b30 JG |
404 | }; |
405 | ||
21c77703 | 406 | #define STD_SECTION(SEC, FLAGS, SYM, NAME, IDX) \ |
fefb4b30 | 407 | asymbol *SYM = (asymbol *) &global_syms[IDX]; \ |
a8a4b6b5 | 408 | asection SEC = { NAME, 0, 0, FLAGS, 0, 0, (boolean) 0, 0, 0, 0, &SEC,\ |
fefb4b30 JG |
409 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, (boolean) 0, \ |
410 | (asymbol *) &global_syms[IDX], &SYM, } | |
411 | ||
21c77703 SC |
412 | STD_SECTION (bfd_com_section, SEC_IS_COMMON, bfd_com_symbol, BFD_COM_SECTION_NAME, 0); |
413 | STD_SECTION (bfd_und_section, 0, bfd_und_symbol, BFD_UND_SECTION_NAME, 1); | |
414 | STD_SECTION (bfd_abs_section, 0, bfd_abs_symbol, BFD_ABS_SECTION_NAME, 2); | |
415 | STD_SECTION (bfd_ind_section, 0, bfd_ind_symbol, BFD_IND_SECTION_NAME, 3); | |
fefb4b30 | 416 | #undef STD_SECTION |
e98e6ec1 SC |
417 | |
418 | /* | |
fefb4b30 JG |
419 | DOCDD |
420 | INODE | |
421 | section prototypes, , typedef asection, Sections | |
4a96bc04 SC |
422 | SUBSECTION |
423 | section prototypes | |
985fca12 | 424 | |
4a96bc04 | 425 | These are the functions exported by the section handling part of |
c188b0be | 426 | <<libbfd>>. |
4a96bc04 | 427 | */ |
985fca12 | 428 | |
4a96bc04 SC |
429 | /* |
430 | FUNCTION | |
431 | bfd_get_section_by_name | |
985fca12 | 432 | |
4a96bc04 SC |
433 | SYNOPSIS |
434 | asection *bfd_get_section_by_name(bfd *abfd, CONST char *name); | |
985fca12 | 435 | |
4a96bc04 | 436 | DESCRIPTION |
c188b0be DM |
437 | Run through the provided @var{abfd} and return the one of the |
438 | <<asection>>s whose name matches @var{name}, otherwise NULL. | |
4a96bc04 | 439 | @xref{Sections}, for more information. |
985fca12 | 440 | |
c188b0be DM |
441 | This should only be used in special cases; the normal way to process |
442 | all sections of a given name is to use bfd_map_over_sections and | |
443 | strcmp on the name (or better yet, base it on the section flags | |
444 | or something else) for each section. | |
4a96bc04 | 445 | */ |
985fca12 | 446 | |
4a96bc04 SC |
447 | asection * |
448 | DEFUN(bfd_get_section_by_name,(abfd, name), | |
449 | bfd *abfd AND | |
450 | CONST char *name) | |
451 | { | |
452 | asection *sect; | |
985fca12 | 453 | |
4a96bc04 SC |
454 | for (sect = abfd->sections; sect != NULL; sect = sect->next) |
455 | if (!strcmp (sect->name, name)) return sect; | |
456 | return NULL; | |
457 | } | |
985fca12 | 458 | |
985fca12 | 459 | |
4a96bc04 SC |
460 | /* |
461 | FUNCTION | |
462 | bfd_make_section_old_way | |
985fca12 | 463 | |
4a96bc04 | 464 | SYNOPSIS |
c188b0be | 465 | asection *bfd_make_section_old_way(bfd *abfd, CONST char *name); |
985fca12 | 466 | |
4a96bc04 | 467 | DESCRIPTION |
c188b0be DM |
468 | Create a new empty section called @var{name} |
469 | and attach it to the end of the chain of sections for the | |
470 | BFD @var{abfd}. An attempt to create a section with a name which | |
4a96bc04 SC |
471 | is already in use, returns its pointer without changing the |
472 | section chain. | |
985fca12 | 473 | |
4a96bc04 | 474 | It has the funny name since this is the way it used to be |
c188b0be | 475 | before it was rewritten.... |
985fca12 | 476 | |
4a96bc04 | 477 | Possible errors are: |
fefb4b30 | 478 | o invalid_operation - |
4a96bc04 | 479 | If output has already started for this BFD. |
fefb4b30 | 480 | o no_memory - |
4a96bc04 | 481 | If obstack alloc fails. |
985fca12 SC |
482 | |
483 | */ | |
484 | ||
985fca12 | 485 | |
985fca12 | 486 | asection * |
4a96bc04 | 487 | DEFUN(bfd_make_section_old_way,(abfd, name), |
985fca12 | 488 | bfd *abfd AND |
4a96bc04 | 489 | CONST char * name) |
985fca12 | 490 | { |
4a96bc04 SC |
491 | asection *sec = bfd_get_section_by_name(abfd, name); |
492 | if (sec == (asection *)NULL) | |
493 | { | |
494 | sec = bfd_make_section(abfd, name); | |
495 | } | |
496 | return sec; | |
985fca12 SC |
497 | } |
498 | ||
4a96bc04 SC |
499 | /* |
500 | FUNCTION | |
c188b0be | 501 | bfd_make_section_anyway |
985fca12 | 502 | |
4a96bc04 | 503 | SYNOPSIS |
c188b0be | 504 | asection *bfd_make_section_anyway(bfd *abfd, CONST char *name); |
985fca12 | 505 | |
4a96bc04 | 506 | DESCRIPTION |
c188b0be DM |
507 | Create a new empty section called @var{name} and attach it to the end of |
508 | the chain of sections for @var{abfd}. Create a new section even if there | |
509 | is already a section with that name. | |
4a96bc04 | 510 | |
c188b0be DM |
511 | Returns NULL and sets bfd_error on error; possible errors are: |
512 | o invalid_operation - If output has already started for @var{abfd}. | |
513 | o no_memory - If obstack alloc fails. | |
985fca12 SC |
514 | */ |
515 | ||
985fca12 | 516 | sec_ptr |
c188b0be DM |
517 | bfd_make_section_anyway (abfd, name) |
518 | bfd *abfd; | |
519 | CONST char *name; | |
985fca12 | 520 | { |
c188b0be DM |
521 | asection *newsect; |
522 | asection **prev = &abfd->sections; | |
985fca12 | 523 | asection * sect = abfd->sections; |
985fca12 | 524 | |
c188b0be DM |
525 | if (abfd->output_has_begun) |
526 | { | |
527 | bfd_error = invalid_operation; | |
528 | return NULL; | |
529 | } | |
21c77703 | 530 | |
985fca12 | 531 | while (sect) { |
985fca12 SC |
532 | prev = §->next; |
533 | sect = sect->next; | |
534 | } | |
535 | ||
536 | newsect = (asection *) bfd_zalloc(abfd, sizeof (asection)); | |
537 | if (newsect == NULL) { | |
538 | bfd_error = no_memory; | |
539 | return NULL; | |
540 | } | |
541 | ||
542 | newsect->name = name; | |
543 | newsect->index = abfd->section_count++; | |
544 | newsect->flags = SEC_NO_FLAGS; | |
545 | ||
546 | newsect->userdata = 0; | |
547 | newsect->next = (asection *)NULL; | |
548 | newsect->relocation = (arelent *)NULL; | |
549 | newsect->reloc_count = 0; | |
550 | newsect->line_filepos =0; | |
551 | newsect->owner = abfd; | |
e98e6ec1 | 552 | |
fefb4b30 JG |
553 | /* Create a symbol whos only job is to point to this section. This is |
554 | useful for things like relocs which are relative to the base of a | |
555 | section. */ | |
e98e6ec1 SC |
556 | newsect->symbol = bfd_make_empty_symbol(abfd); |
557 | newsect->symbol->name = name; | |
558 | newsect->symbol->value = 0; | |
559 | newsect->symbol->section = newsect; | |
560 | newsect->symbol->flags = BSF_SECTION_SYM; | |
e98e6ec1 SC |
561 | |
562 | newsect->symbol_ptr_ptr = &newsect->symbol; | |
c188b0be | 563 | |
985fca12 SC |
564 | if (BFD_SEND (abfd, _new_section_hook, (abfd, newsect)) != true) { |
565 | free (newsect); | |
566 | return NULL; | |
567 | } | |
568 | ||
569 | *prev = newsect; | |
570 | return newsect; | |
571 | } | |
572 | ||
c188b0be DM |
573 | /* |
574 | FUNCTION | |
575 | bfd_make_section | |
576 | ||
577 | SYNOPSIS | |
578 | asection *bfd_make_section(bfd *, CONST char *name); | |
579 | ||
580 | DESCRIPTION | |
581 | Like <<bfd_make_section_anyway>>, but return NULL (without setting | |
582 | bfd_error) without changing the section chain if there is already a | |
583 | section named @var{name}. If there is an error, return NULL and set | |
584 | bfd_error. | |
585 | */ | |
586 | ||
587 | sec_ptr | |
588 | DEFUN(bfd_make_section,(abfd, name), | |
589 | bfd *abfd AND | |
590 | CONST char * name) | |
591 | { | |
592 | asection * sect = abfd->sections; | |
593 | ||
594 | if (strcmp(name, BFD_ABS_SECTION_NAME) == 0) | |
595 | { | |
596 | return &bfd_abs_section; | |
597 | } | |
598 | if (strcmp(name, BFD_COM_SECTION_NAME) == 0) | |
599 | { | |
600 | return &bfd_com_section; | |
601 | } | |
602 | if (strcmp(name, BFD_UND_SECTION_NAME) == 0) | |
603 | { | |
604 | return &bfd_und_section; | |
605 | } | |
606 | ||
607 | if (strcmp(name, BFD_IND_SECTION_NAME) == 0) | |
608 | { | |
609 | return &bfd_ind_section; | |
610 | } | |
611 | ||
612 | while (sect) { | |
613 | if (!strcmp(sect->name, name)) return NULL; | |
614 | sect = sect->next; | |
615 | } | |
616 | ||
617 | /* The name is not already used; go ahead and make a new section. */ | |
618 | return bfd_make_section_anyway (abfd, name); | |
619 | } | |
620 | ||
985fca12 | 621 | |
4a96bc04 SC |
622 | /* |
623 | FUNCTION | |
624 | bfd_set_section_flags | |
625 | ||
626 | SYNOPSIS | |
c188b0be | 627 | boolean bfd_set_section_flags(bfd *abfd, asection *sec, flagword flags); |
4a96bc04 SC |
628 | |
629 | DESCRIPTION | |
c188b0be DM |
630 | Set the attributes of the section @var{sec} in the BFD |
631 | @var{abfd} to the value @var{flags}. Returns <<true>> on success, | |
632 | <<false>> on error. Possible error returns are: | |
4a96bc04 | 633 | |
fefb4b30 | 634 | o invalid operation - |
4a96bc04 SC |
635 | The section cannot have one or more of the attributes |
636 | requested. For example, a .bss section in <<a.out>> may not | |
637 | have the <<SEC_HAS_CONTENTS>> field set. | |
985fca12 | 638 | |
985fca12 SC |
639 | */ |
640 | ||
641 | boolean | |
642 | DEFUN(bfd_set_section_flags,(abfd, section, flags), | |
643 | bfd *abfd AND | |
644 | sec_ptr section AND | |
645 | flagword flags) | |
646 | { | |
fefb4b30 JG |
647 | #if 0 |
648 | /* If you try to copy a text section from an input file (where it | |
649 | has the SEC_CODE flag set) to an output file, this loses big if | |
650 | the bfd_applicable_section_flags (abfd) doesn't have the SEC_CODE | |
651 | set - which it doesn't, at least not for a.out. FIXME */ | |
652 | ||
985fca12 SC |
653 | if ((flags & bfd_applicable_section_flags (abfd)) != flags) { |
654 | bfd_error = invalid_operation; | |
655 | return false; | |
656 | } | |
fefb4b30 | 657 | #endif |
985fca12 SC |
658 | |
659 | section->flags = flags; | |
660 | return true; | |
661 | } | |
662 | ||
663 | ||
4a96bc04 SC |
664 | /* |
665 | FUNCTION | |
666 | bfd_map_over_sections | |
667 | ||
668 | SYNOPSIS | |
fefb4b30 JG |
669 | void bfd_map_over_sections(bfd *abfd, |
670 | void (*func)(bfd *abfd, | |
671 | asection *sect, | |
672 | PTR obj), | |
673 | PTR obj); | |
985fca12 | 674 | |
4a96bc04 | 675 | DESCRIPTION |
c188b0be | 676 | Call the provided function @var{func} for each section |
4a96bc04 SC |
677 | attached to the BFD @var{abfd}, passing @var{obj} as an |
678 | argument. The function will be called as if by | |
985fca12 | 679 | |
4a96bc04 | 680 | | func(abfd, the_section, obj); |
985fca12 | 681 | |
c188b0be | 682 | This is the prefered method for iterating over sections; an |
4a96bc04 SC |
683 | alternative would be to use a loop: |
684 | ||
685 | | section *p; | |
686 | | for (p = abfd->sections; p != NULL; p = p->next) | |
687 | | func(abfd, p, ...) | |
985fca12 | 688 | |
985fca12 | 689 | |
985fca12 SC |
690 | */ |
691 | ||
692 | /*VARARGS2*/ | |
693 | void | |
694 | DEFUN(bfd_map_over_sections,(abfd, operation, user_storage), | |
695 | bfd *abfd AND | |
fefb4b30 | 696 | void (*operation) PARAMS ((bfd *abfd, asection *sect, PTR obj)) AND |
985fca12 SC |
697 | PTR user_storage) |
698 | { | |
699 | asection *sect; | |
700 | int i = 0; | |
701 | ||
702 | for (sect = abfd->sections; sect != NULL; i++, sect = sect->next) | |
703 | (*operation) (abfd, sect, user_storage); | |
704 | ||
705 | if (i != abfd->section_count) /* Debugging */ | |
706 | abort(); | |
707 | } | |
708 | ||
709 | ||
4a96bc04 SC |
710 | /* |
711 | FUNCTION | |
712 | bfd_set_section_size | |
713 | ||
714 | SYNOPSIS | |
c188b0be | 715 | boolean bfd_set_section_size(bfd *abfd, asection *sec, bfd_size_type val); |
985fca12 | 716 | |
4a96bc04 | 717 | DESCRIPTION |
c188b0be | 718 | Set @var{sec} to the size @var{val}. If the operation is |
4a96bc04 SC |
719 | ok, then <<true>> is returned, else <<false>>. |
720 | ||
721 | Possible error returns: | |
fefb4b30 | 722 | o invalid_operation - |
4a96bc04 | 723 | Writing has started to the BFD, so setting the size is invalid |
985fca12 | 724 | |
985fca12 SC |
725 | */ |
726 | ||
727 | boolean | |
728 | DEFUN(bfd_set_section_size,(abfd, ptr, val), | |
729 | bfd *abfd AND | |
730 | sec_ptr ptr AND | |
6724ff46 | 731 | bfd_size_type val) |
985fca12 SC |
732 | { |
733 | /* Once you've started writing to any section you cannot create or change | |
734 | the size of any others. */ | |
735 | ||
736 | if (abfd->output_has_begun) { | |
737 | bfd_error = invalid_operation; | |
738 | return false; | |
739 | } | |
740 | ||
e98e6ec1 SC |
741 | ptr->_cooked_size = val; |
742 | ptr->_raw_size = val; | |
985fca12 SC |
743 | |
744 | return true; | |
745 | } | |
746 | ||
4a96bc04 SC |
747 | /* |
748 | FUNCTION | |
749 | bfd_set_section_contents | |
750 | ||
751 | SYNOPSIS | |
752 | boolean bfd_set_section_contents | |
985fca12 SC |
753 | (bfd *abfd, |
754 | asection *section, | |
755 | PTR data, | |
756 | file_ptr offset, | |
4a96bc04 SC |
757 | bfd_size_type count); |
758 | ||
759 | ||
760 | DESCRIPTION | |
761 | Sets the contents of the section @var{section} in BFD | |
762 | @var{abfd} to the data starting in memory at @var{data}. The | |
763 | data is written to the output section starting at offset | |
764 | @var{offset} for @var{count} bytes. | |
765 | ||
e98e6ec1 SC |
766 | |
767 | ||
4a96bc04 SC |
768 | Normally <<true>> is returned, else <<false>>. Possible error |
769 | returns are: | |
fefb4b30 | 770 | o no_contents - |
4a96bc04 SC |
771 | The output section does not have the <<SEC_HAS_CONTENTS>> |
772 | attribute, so nothing can be written to it. | |
773 | o and some more too | |
774 | ||
775 | This routine is front end to the back end function | |
776 | <<_bfd_set_section_contents>>. | |
777 | ||
985fca12 SC |
778 | |
779 | */ | |
780 | ||
fefb4b30 JG |
781 | #define bfd_get_section_size_now(abfd,sec) \ |
782 | (sec->reloc_done \ | |
783 | ? bfd_get_section_size_after_reloc (sec) \ | |
784 | : bfd_get_section_size_before_reloc (sec)) | |
785 | ||
985fca12 SC |
786 | boolean |
787 | DEFUN(bfd_set_section_contents,(abfd, section, location, offset, count), | |
788 | bfd *abfd AND | |
789 | sec_ptr section AND | |
790 | PTR location AND | |
791 | file_ptr offset AND | |
792 | bfd_size_type count) | |
793 | { | |
fefb4b30 JG |
794 | bfd_size_type sz; |
795 | ||
21c77703 | 796 | if (!bfd_get_section_flags(abfd, section) & SEC_HAS_CONTENTS) |
985fca12 SC |
797 | { |
798 | bfd_error = no_contents; | |
799 | return(false); | |
fefb4b30 JG |
800 | } |
801 | ||
a8a4b6b5 | 802 | if (offset < 0) |
fefb4b30 JG |
803 | { |
804 | bad_val: | |
805 | bfd_error = bad_value; | |
806 | return false; | |
807 | } | |
808 | sz = bfd_get_section_size_now (abfd, section); | |
809 | if (offset > sz | |
810 | || count > sz | |
811 | || offset + count > sz) | |
812 | goto bad_val; | |
985fca12 | 813 | |
a8a4b6b5 KR |
814 | switch (abfd->direction) |
815 | { | |
816 | case read_direction: | |
817 | case no_direction: | |
818 | bfd_error = invalid_operation; | |
819 | return false; | |
820 | ||
821 | case write_direction: | |
822 | break; | |
823 | ||
824 | case both_direction: | |
825 | /* File is opened for update. `output_has_begun' some time ago when | |
826 | the file was created. Do not recompute sections sizes or alignments | |
827 | in _bfd_set_section_content. */ | |
828 | abfd->output_has_begun = true; | |
829 | break; | |
830 | } | |
831 | ||
985fca12 SC |
832 | if (BFD_SEND (abfd, _bfd_set_section_contents, |
833 | (abfd, section, location, offset, count))) | |
834 | { | |
835 | abfd->output_has_begun = true; | |
836 | return true; | |
837 | } | |
838 | ||
839 | return false; | |
840 | } | |
841 | ||
4a96bc04 SC |
842 | /* |
843 | FUNCTION | |
844 | bfd_get_section_contents | |
985fca12 | 845 | |
4a96bc04 SC |
846 | SYNOPSIS |
847 | boolean bfd_get_section_contents | |
848 | (bfd *abfd, asection *section, PTR location, | |
849 | file_ptr offset, bfd_size_type count); | |
985fca12 | 850 | |
4a96bc04 | 851 | DESCRIPTION |
c188b0be | 852 | Read data from @var{section} in BFD @var{abfd} |
4a96bc04 SC |
853 | into memory starting at @var{location}. The data is read at an |
854 | offset of @var{offset} from the start of the input section, | |
855 | and is read for @var{count} bytes. | |
985fca12 | 856 | |
4a96bc04 SC |
857 | If the contents of a constuctor with the <<SEC_CONSTUCTOR>> |
858 | flag set are requested, then the @var{location} is filled with | |
859 | zeroes. If no errors occur, <<true>> is returned, else | |
860 | <<false>>. | |
985fca12 | 861 | |
985fca12 SC |
862 | |
863 | ||
864 | */ | |
865 | boolean | |
866 | DEFUN(bfd_get_section_contents,(abfd, section, location, offset, count), | |
867 | bfd *abfd AND | |
868 | sec_ptr section AND | |
869 | PTR location AND | |
870 | file_ptr offset AND | |
871 | bfd_size_type count) | |
872 | { | |
fefb4b30 | 873 | bfd_size_type sz; |
e98e6ec1 | 874 | |
fefb4b30 JG |
875 | if (section->flags & SEC_CONSTRUCTOR) |
876 | { | |
877 | memset(location, 0, (unsigned)count); | |
878 | return true; | |
879 | } | |
e98e6ec1 | 880 | |
a8a4b6b5 | 881 | if (offset < 0) |
fefb4b30 JG |
882 | { |
883 | bad_val: | |
884 | bfd_error = bad_value; | |
885 | return false; | |
886 | } | |
887 | sz = bfd_get_section_size_now (abfd, section); | |
888 | if (offset > sz | |
889 | || count > sz | |
890 | || offset + count > sz) | |
891 | goto bad_val; | |
892 | ||
893 | if (count == 0) | |
894 | /* Don't bother. */ | |
895 | return true; | |
896 | ||
897 | return BFD_SEND (abfd, _bfd_get_section_contents, | |
898 | (abfd, section, location, offset, count)); | |
e98e6ec1 | 899 | } |