1 /* Object file "section" support for the BFD library.
2 Copyright (C) 1990, 91, 92, 93, 94, 95, 96, 1997
3 Free Software Foundation, Inc.
4 Written by Cygnus Support.
6 This file is part of BFD, the Binary File Descriptor library.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
26 The raw data contained within a BFD is maintained through the
27 section abstraction. A single BFD may have any number of
28 sections. It keeps hold of them by pointing to the first;
29 each one points to the next in the list.
31 Sections are supported in BFD in <<section.c>>.
37 @* section prototypes::
41 Section Input, Section Output, Sections, Sections
45 When a BFD is opened for reading, the section structures are
46 created and attached to the BFD.
48 Each section has a name which describes the section in the
49 outside world---for example, <<a.out>> would contain at least
50 three sections, called <<.text>>, <<.data>> and <<.bss>>.
52 Names need not be unique; for example a COFF file may have several
53 sections named <<.data>>.
55 Sometimes a BFD will contain more than the ``natural'' number of
56 sections. A back end may attach other sections containing
57 constructor data, or an application may add a section (using
58 <<bfd_make_section>>) to the sections attached to an already open
59 BFD. For example, the linker creates an extra section
60 <<COMMON>> for each input file's BFD to hold information about
63 The raw data is not necessarily read in when
64 the section descriptor is created. Some targets may leave the
65 data in place until a <<bfd_get_section_contents>> call is
66 made. Other back ends may read in all the data at once. For
67 example, an S-record file has to be read once to determine the
68 size of the data. An IEEE-695 file doesn't contain raw data in
69 sections, but data and relocation expressions intermixed, so
70 the data area has to be parsed to get out the data and
74 Section Output, typedef asection, Section Input, Sections
79 To write a new object style BFD, the various sections to be
80 written have to be created. They are attached to the BFD in
81 the same way as input sections; data is written to the
82 sections using <<bfd_set_section_contents>>.
84 Any program that creates or combines sections (e.g., the assembler
85 and linker) must use the <<asection>> fields <<output_section>> and
86 <<output_offset>> to indicate the file sections to which each
87 section must be written. (If the section is being created from
88 scratch, <<output_section>> should probably point to the section
89 itself and <<output_offset>> should probably be zero.)
91 The data to be written comes from input sections attached
92 (via <<output_section>> pointers) to
93 the output sections. The output section structure can be
94 considered a filter for the input section: the output section
95 determines the vma of the output data and the name, but the
96 input section determines the offset into the output section of
97 the data to be written.
99 E.g., to create a section "O", starting at 0x100, 0x123 long,
100 containing two subsections, "A" at offset 0x0 (i.e., at vma
101 0x100) and "B" at offset 0x20 (i.e., at vma 0x120) the <<asection>>
102 structures would look like:
107 | output_section -----------> section name "O"
109 | section name "B" | size 0x123
110 | output_offset 0x20 |
112 | output_section --------|
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.
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.
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.
145 typedef asection, section prototypes, Section Output, Sections
149 Here is the section structure:
155 . {* The name of the section; the name isn't a copy, the pointer is
156 . the same as that passed to bfd_make_section. *}
160 . {* Which section is it; 0..nth. *}
164 . {* The next section in the list belonging to the BFD, or NULL. *}
168 . {* The field flags contains attributes of the section. Some
169 . flags are read in from the object file, and some are
170 . synthesized from other information. *}
174 .#define SEC_NO_FLAGS 0x000
176 . {* Tells the OS to allocate space for this section when loading.
177 . This is clear for a section containing debug information
179 .#define SEC_ALLOC 0x001
181 . {* Tells the OS to load the section from the file when loading.
182 . This is clear for a .bss section. *}
183 .#define SEC_LOAD 0x002
185 . {* The section contains data still to be relocated, so there is
186 . some relocation information too. *}
187 .#define SEC_RELOC 0x004
189 .#if 0 {* Obsolete ? *}
190 .#define SEC_BALIGN 0x008
193 . {* A signal to the OS that the section contains read only
195 .#define SEC_READONLY 0x010
197 . {* The section contains code only. *}
198 .#define SEC_CODE 0x020
200 . {* The section contains data only. *}
201 .#define SEC_DATA 0x040
203 . {* The section will reside in ROM. *}
204 .#define SEC_ROM 0x080
206 . {* The section contains constructor information. This section
207 . type is used by the linker to create lists of constructors and
208 . destructors used by <<g++>>. When a back end sees a symbol
209 . which should be used in a constructor list, it creates a new
210 . section for the type of name (e.g., <<__CTOR_LIST__>>), attaches
211 . the symbol to it, and builds a relocation. To build the lists
212 . of constructors, all the linker has to do is catenate all the
213 . sections called <<__CTOR_LIST__>> and relocate the data
214 . contained within - exactly the operations it would peform on
216 .#define SEC_CONSTRUCTOR 0x100
218 . {* The section is a constructor, and should be placed at the
219 . end of the text, data, or bss section(?). *}
220 .#define SEC_CONSTRUCTOR_TEXT 0x1100
221 .#define SEC_CONSTRUCTOR_DATA 0x2100
222 .#define SEC_CONSTRUCTOR_BSS 0x3100
224 . {* The section has contents - a data section could be
225 . <<SEC_ALLOC>> | <<SEC_HAS_CONTENTS>>; a debug section could be
226 . <<SEC_HAS_CONTENTS>> *}
227 .#define SEC_HAS_CONTENTS 0x200
229 . {* An instruction to the linker to not output the section
230 . even if it has information which would normally be written. *}
231 .#define SEC_NEVER_LOAD 0x400
233 . {* The section is a COFF shared library section. This flag is
234 . only for the linker. If this type of section appears in
235 . the input file, the linker must copy it to the output file
236 . without changing the vma or size. FIXME: Although this
237 . was originally intended to be general, it really is COFF
238 . specific (and the flag was renamed to indicate this). It
239 . might be cleaner to have some more general mechanism to
240 . allow the back end to control what the linker does with
242 .#define SEC_COFF_SHARED_LIBRARY 0x800
244 . {* The section contains common symbols (symbols may be defined
245 . multiple times, the value of a symbol is the amount of
246 . space it requires, and the largest symbol value is the one
247 . used). Most targets have exactly one of these (which we
248 . translate to bfd_com_section_ptr), but ECOFF has two. *}
249 .#define SEC_IS_COMMON 0x8000
251 . {* The section contains only debugging information. For
252 . example, this is set for ELF .debug and .stab sections.
253 . strip tests this flag to see if a section can be
255 .#define SEC_DEBUGGING 0x10000
257 . {* The contents of this section are held in memory pointed to
258 . by the contents field. This is checked by
259 . bfd_get_section_contents, and the data is retrieved from
260 . memory if appropriate. *}
261 .#define SEC_IN_MEMORY 0x20000
263 . {* The contents of this section are to be excluded by the
264 . linker for executable and shared objects unless those
265 . objects are to be further relocated. *}
266 .#define SEC_EXCLUDE 0x40000
268 . {* The contents of this section are to be sorted by the
269 . based on the address specified in the associated symbol
271 .#define SEC_SORT_ENTRIES 0x80000
273 . {* When linking, duplicate sections of the same name should be
274 . discarded, rather than being combined into a single section as
275 . is usually done. This is similar to how common symbols are
276 . handled. See SEC_LINK_DUPLICATES below. *}
277 .#define SEC_LINK_ONCE 0x100000
279 . {* If SEC_LINK_ONCE is set, this bitfield describes how the linker
280 . should handle duplicate sections. *}
281 .#define SEC_LINK_DUPLICATES 0x600000
283 . {* This value for SEC_LINK_DUPLICATES means that duplicate
284 . sections with the same name should simply be discarded. *}
285 .#define SEC_LINK_DUPLICATES_DISCARD 0x0
287 . {* This value for SEC_LINK_DUPLICATES means that the linker
288 . should warn if there are any duplicate sections, although
289 . it should still only link one copy. *}
290 .#define SEC_LINK_DUPLICATES_ONE_ONLY 0x200000
292 . {* This value for SEC_LINK_DUPLICATES means that the linker
293 . should warn if any duplicate sections are a different size. *}
294 .#define SEC_LINK_DUPLICATES_SAME_SIZE 0x400000
296 . {* This value for SEC_LINK_DUPLICATES means that the linker
297 . should warn if any duplicate sections contain different
299 .#define SEC_LINK_DUPLICATES_SAME_CONTENTS 0x600000
301 . {* This section was created by the linker as part of dynamic
302 . relocation or other arcane processing. It is skipped when
303 . going through the first-pass output, trusting that someone
304 . else up the line will take care of it later. *}
305 .#define SEC_LINKER_CREATED 0x800000
307 . {* This section should not be subject to garbage collection. *}
308 .#define SEC_KEEP 0x1000000
310 . {* This section contains "short" data, and should be placed
312 .#define SEC_SHORT 0x2000000
314 . {* End of section flags. *}
316 . {* Some internal packed boolean fields. *}
318 . {* See the vma field. *}
319 . unsigned int user_set_vma : 1;
321 . {* Whether relocations have been processed. *}
322 . unsigned int reloc_done : 1;
324 . {* A mark flag used by some of the linker backends. *}
325 . unsigned int linker_mark : 1;
327 . {* A mark flag used by some linker backends for garbage collection. *}
328 . unsigned int gc_mark : 1;
330 . {* End of internal packed boolean fields. *}
332 . {* The virtual memory address of the section - where it will be
333 . at run time. The symbols are relocated against this. The
334 . user_set_vma flag is maintained by bfd; if it's not set, the
335 . backend can assign addresses (for example, in <<a.out>>, where
336 . the default address for <<.data>> is dependent on the specific
337 . target and various flags). *}
341 . {* The load address of the section - where it would be in a
342 . rom image; really only used for writing section header
347 . {* The size of the section in bytes, as it will be output.
348 . contains a value even if the section has no contents (e.g., the
349 . size of <<.bss>>). This will be filled in after relocation *}
351 . bfd_size_type _cooked_size;
353 . {* The original size on disk of the section, in bytes. Normally this
354 . value is the same as the size, but if some relaxing has
355 . been done, then this value will be bigger. *}
357 . bfd_size_type _raw_size;
359 . {* If this section is going to be output, then this value is the
360 . offset into the output section of the first byte in the input
361 . section. E.g., if this was going to start at the 100th byte in
362 . the output section, this value would be 100. *}
364 . bfd_vma output_offset;
366 . {* The output section through which to map on output. *}
368 . struct sec *output_section;
370 . {* The alignment requirement of the section, as an exponent of 2 -
371 . e.g., 3 aligns to 2^3 (or 8). *}
373 . unsigned int alignment_power;
375 . {* If an input section, a pointer to a vector of relocation
376 . records for the data in this section. *}
378 . struct reloc_cache_entry *relocation;
380 . {* If an output section, a pointer to a vector of pointers to
381 . relocation records for the data in this section. *}
383 . struct reloc_cache_entry **orelocation;
385 . {* The number of relocation records in one of the above *}
387 . unsigned reloc_count;
389 . {* Information below is back end specific - and not always used
392 . {* File position of section data *}
396 . {* File position of relocation info *}
398 . file_ptr rel_filepos;
400 . {* File position of line data *}
402 . file_ptr line_filepos;
404 . {* Pointer to data for applications *}
408 . {* If the SEC_IN_MEMORY flag is set, this points to the actual
410 . unsigned char *contents;
412 . {* Attached line number information *}
416 . {* Number of line number records *}
418 . unsigned int lineno_count;
420 . {* When a section is being output, this value changes as more
421 . linenumbers are written out *}
423 . file_ptr moving_line_filepos;
425 . {* What the section number is in the target world *}
431 . {* If this is a constructor section then here is a list of the
432 . relocations created to relocate items within it. *}
434 . struct relent_chain *constructor_chain;
436 . {* The BFD which owns the section. *}
440 . {* A symbol which points at this section only *}
441 . struct symbol_cache_entry *symbol;
442 . struct symbol_cache_entry **symbol_ptr_ptr;
444 . struct bfd_link_order *link_order_head;
445 . struct bfd_link_order *link_order_tail;
448 . {* These sections are global, and are managed by BFD. The application
449 . and target back end are not permitted to change the values in
450 . these sections. New code should use the section_ptr macros rather
451 . than referring directly to the const sections. The const sections
452 . may eventually vanish. *}
453 .#define BFD_ABS_SECTION_NAME "*ABS*"
454 .#define BFD_UND_SECTION_NAME "*UND*"
455 .#define BFD_COM_SECTION_NAME "*COM*"
456 .#define BFD_IND_SECTION_NAME "*IND*"
458 . {* the absolute section *}
459 .extern const asection bfd_abs_section;
460 .#define bfd_abs_section_ptr ((asection *) &bfd_abs_section)
461 .#define bfd_is_abs_section(sec) ((sec) == bfd_abs_section_ptr)
462 . {* Pointer to the undefined section *}
463 .extern const asection bfd_und_section;
464 .#define bfd_und_section_ptr ((asection *) &bfd_und_section)
465 .#define bfd_is_und_section(sec) ((sec) == bfd_und_section_ptr)
466 . {* Pointer to the common section *}
467 .extern const asection bfd_com_section;
468 .#define bfd_com_section_ptr ((asection *) &bfd_com_section)
469 . {* Pointer to the indirect section *}
470 .extern const asection bfd_ind_section;
471 .#define bfd_ind_section_ptr ((asection *) &bfd_ind_section)
472 .#define bfd_is_ind_section(sec) ((sec) == bfd_ind_section_ptr)
474 .extern const struct symbol_cache_entry * const bfd_abs_symbol;
475 .extern const struct symbol_cache_entry * const bfd_com_symbol;
476 .extern const struct symbol_cache_entry * const bfd_und_symbol;
477 .extern const struct symbol_cache_entry * const bfd_ind_symbol;
478 .#define bfd_get_section_size_before_reloc(section) \
479 . (section->reloc_done ? (abort(),1): (section)->_raw_size)
480 .#define bfd_get_section_size_after_reloc(section) \
481 . ((section->reloc_done) ? (section)->_cooked_size: (abort(),1))
484 /* These symbols are global, not specific to any BFD. Therefore, anything
485 that tries to change them is broken, and should be repaired. */
486 static const asymbol global_syms
[] =
488 /* the_bfd, name, value, attr, section [, udata] */
489 {0, BFD_COM_SECTION_NAME
, 0, BSF_SECTION_SYM
, (asection
*) &bfd_com_section
},
490 {0, BFD_UND_SECTION_NAME
, 0, BSF_SECTION_SYM
, (asection
*) &bfd_und_section
},
491 {0, BFD_ABS_SECTION_NAME
, 0, BSF_SECTION_SYM
, (asection
*) &bfd_abs_section
},
492 {0, BFD_IND_SECTION_NAME
, 0, BSF_SECTION_SYM
, (asection
*) &bfd_ind_section
},
495 #define STD_SECTION(SEC, FLAGS, SYM, NAME, IDX) \
496 const asymbol * const SYM = (asymbol *) &global_syms[IDX]; \
497 const asection SEC = \
498 { NAME, 0, 0, FLAGS, 0, 0, 0, 0, 0, 0, 0, 0, 0, (asection *) &SEC, \
499 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
500 (asymbol *) &global_syms[IDX], (asymbol **) &SYM, 0, 0 }
502 STD_SECTION (bfd_com_section
, SEC_IS_COMMON
, bfd_com_symbol
,
503 BFD_COM_SECTION_NAME
, 0);
504 STD_SECTION (bfd_und_section
, 0, bfd_und_symbol
, BFD_UND_SECTION_NAME
, 1);
505 STD_SECTION (bfd_abs_section
, 0, bfd_abs_symbol
, BFD_ABS_SECTION_NAME
, 2);
506 STD_SECTION (bfd_ind_section
, 0, bfd_ind_symbol
, BFD_IND_SECTION_NAME
, 3);
512 section prototypes, , typedef asection, Sections
516 These are the functions exported by the section handling part of BFD.
521 bfd_get_section_by_name
524 asection *bfd_get_section_by_name(bfd *abfd, CONST char *name);
527 Run through @var{abfd} and return the one of the
528 <<asection>>s whose name matches @var{name}, otherwise <<NULL>>.
529 @xref{Sections}, for more information.
531 This should only be used in special cases; the normal way to process
532 all sections of a given name is to use <<bfd_map_over_sections>> and
533 <<strcmp>> on the name (or better yet, base it on the section flags
534 or something else) for each section.
538 bfd_get_section_by_name (abfd
, name
)
544 for (sect
= abfd
->sections
; sect
!= NULL
; sect
= sect
->next
)
545 if (!strcmp (sect
->name
, name
))
553 bfd_make_section_old_way
556 asection *bfd_make_section_old_way(bfd *abfd, CONST char *name);
559 Create a new empty section called @var{name}
560 and attach it to the end of the chain of sections for the
561 BFD @var{abfd}. An attempt to create a section with a name which
562 is already in use returns its pointer without changing the
565 It has the funny name since this is the way it used to be
566 before it was rewritten....
569 o <<bfd_error_invalid_operation>> -
570 If output has already started for this BFD.
571 o <<bfd_error_no_memory>> -
572 If memory allocation fails.
578 bfd_make_section_old_way (abfd
, name
)
582 asection
*sec
= bfd_get_section_by_name (abfd
, name
);
583 if (sec
== (asection
*) NULL
)
585 sec
= bfd_make_section (abfd
, name
);
592 bfd_make_section_anyway
595 asection *bfd_make_section_anyway(bfd *abfd, CONST char *name);
598 Create a new empty section called @var{name} and attach it to the end of
599 the chain of sections for @var{abfd}. Create a new section even if there
600 is already a section with that name.
602 Return <<NULL>> and set <<bfd_error>> on error; possible errors are:
603 o <<bfd_error_invalid_operation>> - If output has already started for @var{abfd}.
604 o <<bfd_error_no_memory>> - If memory allocation fails.
608 bfd_make_section_anyway (abfd
, name
)
613 asection
**prev
= &abfd
->sections
;
614 asection
*sect
= abfd
->sections
;
616 if (abfd
->output_has_begun
)
618 bfd_set_error (bfd_error_invalid_operation
);
628 newsect
= (asection
*) bfd_zalloc (abfd
, sizeof (asection
));
632 newsect
->name
= name
;
633 newsect
->index
= abfd
->section_count
++;
634 newsect
->flags
= SEC_NO_FLAGS
;
636 newsect
->userdata
= NULL
;
637 newsect
->contents
= NULL
;
638 newsect
->next
= (asection
*) NULL
;
639 newsect
->relocation
= (arelent
*) NULL
;
640 newsect
->reloc_count
= 0;
641 newsect
->line_filepos
= 0;
642 newsect
->owner
= abfd
;
644 /* Create a symbol whos only job is to point to this section. This is
645 useful for things like relocs which are relative to the base of a
647 newsect
->symbol
= bfd_make_empty_symbol (abfd
);
648 if (newsect
->symbol
== NULL
)
650 newsect
->symbol
->name
= name
;
651 newsect
->symbol
->value
= 0;
652 newsect
->symbol
->section
= newsect
;
653 newsect
->symbol
->flags
= BSF_SECTION_SYM
;
655 newsect
->symbol_ptr_ptr
= &newsect
->symbol
;
657 if (BFD_SEND (abfd
, _new_section_hook
, (abfd
, newsect
)) != true)
672 asection *bfd_make_section(bfd *, CONST char *name);
675 Like <<bfd_make_section_anyway>>, but return <<NULL>> (without calling
676 bfd_set_error ()) without changing the section chain if there is already a
677 section named @var{name}. If there is an error, return <<NULL>> and set
682 bfd_make_section (abfd
, name
)
686 asection
*sect
= abfd
->sections
;
688 if (strcmp (name
, BFD_ABS_SECTION_NAME
) == 0)
690 return bfd_abs_section_ptr
;
692 if (strcmp (name
, BFD_COM_SECTION_NAME
) == 0)
694 return bfd_com_section_ptr
;
696 if (strcmp (name
, BFD_UND_SECTION_NAME
) == 0)
698 return bfd_und_section_ptr
;
701 if (strcmp (name
, BFD_IND_SECTION_NAME
) == 0)
703 return bfd_ind_section_ptr
;
708 if (!strcmp (sect
->name
, name
))
713 /* The name is not already used; go ahead and make a new section. */
714 return bfd_make_section_anyway (abfd
, name
);
720 bfd_set_section_flags
723 boolean bfd_set_section_flags(bfd *abfd, asection *sec, flagword flags);
726 Set the attributes of the section @var{sec} in the BFD
727 @var{abfd} to the value @var{flags}. Return <<true>> on success,
728 <<false>> on error. Possible error returns are:
730 o <<bfd_error_invalid_operation>> -
731 The section cannot have one or more of the attributes
732 requested. For example, a .bss section in <<a.out>> may not
733 have the <<SEC_HAS_CONTENTS>> field set.
739 bfd_set_section_flags (abfd
, section
, flags
)
745 /* If you try to copy a text section from an input file (where it
746 has the SEC_CODE flag set) to an output file, this loses big if
747 the bfd_applicable_section_flags (abfd) doesn't have the SEC_CODE
748 set - which it doesn't, at least not for a.out. FIXME */
750 if ((flags
& bfd_applicable_section_flags (abfd
)) != flags
)
752 bfd_set_error (bfd_error_invalid_operation
);
757 section
->flags
= flags
;
764 bfd_map_over_sections
767 void bfd_map_over_sections(bfd *abfd,
768 void (*func)(bfd *abfd,
774 Call the provided function @var{func} for each section
775 attached to the BFD @var{abfd}, passing @var{obj} as an
776 argument. The function will be called as if by
778 | func(abfd, the_section, obj);
780 This is the prefered method for iterating over sections; an
781 alternative would be to use a loop:
784 | for (p = abfd->sections; p != NULL; p = p->next)
792 bfd_map_over_sections (abfd
, operation
, user_storage
)
794 void (*operation
) PARAMS ((bfd
* abfd
, asection
* sect
, PTR obj
));
800 for (sect
= abfd
->sections
; sect
!= NULL
; i
++, sect
= sect
->next
)
801 (*operation
) (abfd
, sect
, user_storage
);
803 if (i
!= abfd
->section_count
) /* Debugging */
813 boolean bfd_set_section_size(bfd *abfd, asection *sec, bfd_size_type val);
816 Set @var{sec} to the size @var{val}. If the operation is
817 ok, then <<true>> is returned, else <<false>>.
819 Possible error returns:
820 o <<bfd_error_invalid_operation>> -
821 Writing has started to the BFD, so setting the size is invalid.
826 bfd_set_section_size (abfd
, ptr
, val
)
831 /* Once you've started writing to any section you cannot create or change
832 the size of any others. */
834 if (abfd
->output_has_begun
)
836 bfd_set_error (bfd_error_invalid_operation
);
840 ptr
->_cooked_size
= val
;
841 ptr
->_raw_size
= val
;
848 bfd_set_section_contents
851 boolean bfd_set_section_contents
856 bfd_size_type count);
860 Sets the contents of the section @var{section} in BFD
861 @var{abfd} to the data starting in memory at @var{data}. The
862 data is written to the output section starting at offset
863 @var{offset} for @var{count} bytes.
867 Normally <<true>> is returned, else <<false>>. Possible error
869 o <<bfd_error_no_contents>> -
870 The output section does not have the <<SEC_HAS_CONTENTS>>
871 attribute, so nothing can be written to it.
874 This routine is front end to the back end function
875 <<_bfd_set_section_contents>>.
880 #define bfd_get_section_size_now(abfd,sec) \
882 ? bfd_get_section_size_after_reloc (sec) \
883 : bfd_get_section_size_before_reloc (sec))
886 bfd_set_section_contents (abfd
, section
, location
, offset
, count
)
895 if (!(bfd_get_section_flags (abfd
, section
) & SEC_HAS_CONTENTS
))
897 bfd_set_error (bfd_error_no_contents
);
904 bfd_set_error (bfd_error_bad_value
);
907 sz
= bfd_get_section_size_now (abfd
, section
);
908 if ((bfd_size_type
) offset
> sz
910 || offset
+ count
> sz
)
913 switch (abfd
->direction
)
917 bfd_set_error (bfd_error_invalid_operation
);
920 case write_direction
:
924 /* File is opened for update. `output_has_begun' some time ago when
925 the file was created. Do not recompute sections sizes or alignments
926 in _bfd_set_section_content. */
927 abfd
->output_has_begun
= true;
931 if (BFD_SEND (abfd
, _bfd_set_section_contents
,
932 (abfd
, section
, location
, offset
, count
)))
934 abfd
->output_has_begun
= true;
943 bfd_get_section_contents
946 boolean bfd_get_section_contents
947 (bfd *abfd, asection *section, PTR location,
948 file_ptr offset, bfd_size_type count);
951 Read data from @var{section} in BFD @var{abfd}
952 into memory starting at @var{location}. The data is read at an
953 offset of @var{offset} from the start of the input section,
954 and is read for @var{count} bytes.
956 If the contents of a constructor with the <<SEC_CONSTRUCTOR>>
957 flag set are requested or if the section does not have the
958 <<SEC_HAS_CONTENTS>> flag set, then the @var{location} is filled
959 with zeroes. If no errors occur, <<true>> is returned, else
966 bfd_get_section_contents (abfd
, section
, location
, offset
, count
)
975 if (section
->flags
& SEC_CONSTRUCTOR
)
977 memset (location
, 0, (unsigned) count
);
984 bfd_set_error (bfd_error_bad_value
);
987 /* Even if reloc_done is true, this function reads unrelocated
988 contents, so we want the raw size. */
989 sz
= section
->_raw_size
;
990 if ((bfd_size_type
) offset
> sz
|| count
> sz
|| offset
+ count
> sz
)
997 if ((section
->flags
& SEC_HAS_CONTENTS
) == 0)
999 memset (location
, 0, (unsigned) count
);
1003 if ((section
->flags
& SEC_IN_MEMORY
) != 0)
1005 memcpy (location
, section
->contents
+ offset
, (size_t) count
);
1009 return BFD_SEND (abfd
, _bfd_get_section_contents
,
1010 (abfd
, section
, location
, offset
, count
));
1015 bfd_copy_private_section_data
1018 boolean bfd_copy_private_section_data(bfd *ibfd, asection *isec, bfd *obfd, asection *osec);
1021 Copy private section information from @var{isec} in the BFD
1022 @var{ibfd} to the section @var{osec} in the BFD @var{obfd}.
1023 Return <<true>> on success, <<false>> on error. Possible error
1026 o <<bfd_error_no_memory>> -
1027 Not enough memory exists to create private data for @var{osec}.
1029 .#define bfd_copy_private_section_data(ibfd, isection, obfd, osection) \
1030 . BFD_SEND (obfd, _bfd_copy_private_section_data, \
1031 . (ibfd, isection, obfd, osection))
1036 _bfd_strip_section_from_output
1039 void _bfd_strip_section_from_output
1040 (asection *section);
1043 Remove @var{section} from the output. If the output section becomes
1044 empty, remove it from the output bfd.
1047 _bfd_strip_section_from_output (s
)
1050 asection
**spp
, *os
;
1051 struct bfd_link_order
*p
, *pp
;
1053 /* Excise the input section from the link order. */
1054 os
= s
->output_section
;
1055 for (p
= os
->link_order_head
, pp
= NULL
; p
!= NULL
; pp
= p
, p
= p
->next
)
1056 if (p
->type
== bfd_indirect_link_order
1057 && p
->u
.indirect
.section
== s
)
1062 os
->link_order_head
= p
->next
;
1064 os
->link_order_tail
= pp
;
1068 /* If the output section is empty, remove it too. Careful about sections
1069 that have been discarded in the link script -- they are mapped to
1070 bfd_abs_section, which has no owner. */
1071 if (!os
->link_order_head
&& os
->owner
)
1073 for (spp
= &os
->owner
->sections
; *spp
; spp
= &(*spp
)->next
)
1077 os
->owner
->section_count
--;