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Diffstat (limited to 'bfd/section.c')
| -rw-r--r-- | bfd/section.c | 1278 |
1 files changed, 0 insertions, 1278 deletions
diff --git a/bfd/section.c b/bfd/section.c deleted file mode 100644 index 78ab0cb4830..00000000000 --- a/bfd/section.c +++ /dev/null @@ -1,1278 +0,0 @@ -/* Object file "section" support for the BFD library. - Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, - 2000, 2001 - Free Software Foundation, Inc. - Written by Cygnus Support. - -This file is part of BFD, the Binary File Descriptor library. - -This program is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 2 of the License, or -(at your option) any later version. - -This program is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -GNU General Public License for more details. - -You should have received a copy of the GNU General Public License -along with this program; if not, write to the Free Software -Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ - -/* -SECTION - Sections - - The raw data contained within a BFD is maintained through the - section abstraction. A single BFD may have any number of - sections. It keeps hold of them by pointing to the first; - each one points to the next in the list. - - Sections are supported in BFD in <<section.c>>. - -@menu -@* Section Input:: -@* Section Output:: -@* typedef asection:: -@* section prototypes:: -@end menu - -INODE -Section Input, Section Output, Sections, Sections -SUBSECTION - Section input - - When a BFD is opened for reading, the section structures are - created and attached to the BFD. - - Each section has a name which describes the section in the - outside world---for example, <<a.out>> would contain at least - three sections, called <<.text>>, <<.data>> and <<.bss>>. - - Names need not be unique; for example a COFF file may have several - sections named <<.data>>. - - Sometimes a BFD will contain more than the ``natural'' number of - sections. A back end may attach other sections containing - constructor data, or an application may add a section (using - <<bfd_make_section>>) to the sections attached to an already open - BFD. For example, the linker creates an extra section - <<COMMON>> for each input file's BFD to hold information about - common storage. - - The raw data is not necessarily read in when - the section descriptor is created. Some targets may leave the - data in place until a <<bfd_get_section_contents>> call is - made. Other back ends may read in all the data at once. For - example, an S-record file has to be read once to determine the - size of the data. An IEEE-695 file doesn't contain raw data in - sections, but data and relocation expressions intermixed, so - the data area has to be parsed to get out the data and - relocations. - -INODE -Section Output, typedef asection, Section Input, Sections - -SUBSECTION - Section output - - To write a new object style BFD, the various sections to be - written have to be created. They are attached to the BFD in - the same way as input sections; data is written to the - sections using <<bfd_set_section_contents>>. - - Any program that creates or combines sections (e.g., the assembler - and linker) must use the <<asection>> fields <<output_section>> and - <<output_offset>> to indicate the file sections to which each - section must be written. (If the section is being created from - scratch, <<output_section>> should probably point to the section - itself and <<output_offset>> should probably be zero.) - - The data to be written comes from input sections attached - (via <<output_section>> pointers) to - the output sections. The output section structure can be - considered a filter for the input section: the output section - determines the vma of the output data and the name, but the - input section determines the offset into the output section of - the data to be written. - - E.g., to create a section "O", starting at 0x100, 0x123 long, - containing two subsections, "A" at offset 0x0 (i.e., at vma - 0x100) and "B" at offset 0x20 (i.e., at vma 0x120) the <<asection>> - structures would look like: - -| section name "A" -| output_offset 0x00 -| size 0x20 -| output_section -----------> section name "O" -| | vma 0x100 -| section name "B" | size 0x123 -| output_offset 0x20 | -| size 0x103 | -| output_section --------| - -SUBSECTION - Link orders - - The data within a section is stored in a @dfn{link_order}. - These are much like the fixups in <<gas>>. The link_order - abstraction allows a section to grow and shrink within itself. - - A link_order knows how big it is, and which is the next - link_order and where the raw data for it is; it also points to - a list of relocations which apply to it. - - The link_order is used by the linker to perform relaxing on - final code. The compiler creates code which is as big as - necessary to make it work without relaxing, and the user can - select whether to relax. Sometimes relaxing takes a lot of - time. The linker runs around the relocations to see if any - are attached to data which can be shrunk, if so it does it on - a link_order by link_order basis. - -*/ - -#include "bfd.h" -#include "sysdep.h" -#include "libbfd.h" -#include "bfdlink.h" - -/* -DOCDD -INODE -typedef asection, section prototypes, Section Output, Sections -SUBSECTION - typedef asection - - Here is the section structure: - -CODE_FRAGMENT -. -.{* This structure is used for a comdat section, as in PE. A comdat -. section is associated with a particular symbol. When the linker -. sees a comdat section, it keeps only one of the sections with a -. given name and associated with a given symbol. *} -. -.struct bfd_comdat_info -.{ -. {* The name of the symbol associated with a comdat section. *} -. const char *name; -. -. {* The local symbol table index of the symbol associated with a -. comdat section. This is only meaningful to the object file format -. specific code; it is not an index into the list returned by -. bfd_canonicalize_symtab. *} -. long symbol; -.}; -. -.typedef struct sec -.{ -. {* The name of the section; the name isn't a copy, the pointer is -. the same as that passed to bfd_make_section. *} -. -. const char *name; -. -. {* A unique sequence number. *} -. -. int id; -. -. {* Which section is it; 0..nth. *} -. -. int index; -. -. {* The next section in the list belonging to the BFD, or NULL. *} -. -. struct sec *next; -. -. {* The field flags contains attributes of the section. Some -. flags are read in from the object file, and some are -. synthesized from other information. *} -. -. flagword flags; -. -.#define SEC_NO_FLAGS 0x000 -. -. {* Tells the OS to allocate space for this section when loading. -. This is clear for a section containing debug information only. *} -.#define SEC_ALLOC 0x001 -. -. {* Tells the OS to load the section from the file when loading. -. This is clear for a .bss section. *} -.#define SEC_LOAD 0x002 -. -. {* The section contains data still to be relocated, so there is -. some relocation information too. *} -.#define SEC_RELOC 0x004 -. -.#if 0 {* Obsolete ? *} -.#define SEC_BALIGN 0x008 -.#endif -. -. {* A signal to the OS that the section contains read only data. *} -.#define SEC_READONLY 0x010 -. -. {* The section contains code only. *} -.#define SEC_CODE 0x020 -. -. {* The section contains data only. *} -.#define SEC_DATA 0x040 -. -. {* The section will reside in ROM. *} -.#define SEC_ROM 0x080 -. -. {* The section contains constructor information. This section -. type is used by the linker to create lists of constructors and -. destructors used by <<g++>>. When a back end sees a symbol -. which should be used in a constructor list, it creates a new -. section for the type of name (e.g., <<__CTOR_LIST__>>), attaches -. the symbol to it, and builds a relocation. To build the lists -. of constructors, all the linker has to do is catenate all the -. sections called <<__CTOR_LIST__>> and relocate the data -. contained within - exactly the operations it would peform on -. standard data. *} -.#define SEC_CONSTRUCTOR 0x100 -. -. {* The section is a constructor, and should be placed at the -. end of the text, data, or bss section(?). *} -.#define SEC_CONSTRUCTOR_TEXT 0x1100 -.#define SEC_CONSTRUCTOR_DATA 0x2100 -.#define SEC_CONSTRUCTOR_BSS 0x3100 -. -. {* The section has contents - a data section could be -. <<SEC_ALLOC>> | <<SEC_HAS_CONTENTS>>; a debug section could be -. <<SEC_HAS_CONTENTS>> *} -.#define SEC_HAS_CONTENTS 0x200 -. -. {* An instruction to the linker to not output the section -. even if it has information which would normally be written. *} -.#define SEC_NEVER_LOAD 0x400 -. -. {* The section is a COFF shared library section. This flag is -. only for the linker. If this type of section appears in -. the input file, the linker must copy it to the output file -. without changing the vma or size. FIXME: Although this -. was originally intended to be general, it really is COFF -. specific (and the flag was renamed to indicate this). It -. might be cleaner to have some more general mechanism to -. allow the back end to control what the linker does with -. sections. *} -.#define SEC_COFF_SHARED_LIBRARY 0x800 -. -. {* The section has GOT references. This flag is only for the -. linker, and is currently only used by the elf32-hppa back end. -. It will be set if global offset table references were detected -. in this section, which indicate to the linker that the section -. contains PIC code, and must be handled specially when doing a -. static link. *} -.#define SEC_HAS_GOT_REF 0x4000 -. -. {* The section contains common symbols (symbols may be defined -. multiple times, the value of a symbol is the amount of -. space it requires, and the largest symbol value is the one -. used). Most targets have exactly one of these (which we -. translate to bfd_com_section_ptr), but ECOFF has two. *} -.#define SEC_IS_COMMON 0x8000 -. -. {* The section contains only debugging information. For -. example, this is set for ELF .debug and .stab sections. -. strip tests this flag to see if a section can be -. discarded. *} -.#define SEC_DEBUGGING 0x10000 -. -. {* The contents of this section are held in memory pointed to -. by the contents field. This is checked by bfd_get_section_contents, -. and the data is retrieved from memory if appropriate. *} -.#define SEC_IN_MEMORY 0x20000 -. -. {* The contents of this section are to be excluded by the -. linker for executable and shared objects unless those -. objects are to be further relocated. *} -.#define SEC_EXCLUDE 0x40000 -. -. {* The contents of this section are to be sorted by the -. based on the address specified in the associated symbol -. table. *} -.#define SEC_SORT_ENTRIES 0x80000 -. -. {* When linking, duplicate sections of the same name should be -. discarded, rather than being combined into a single section as -. is usually done. This is similar to how common symbols are -. handled. See SEC_LINK_DUPLICATES below. *} -.#define SEC_LINK_ONCE 0x100000 -. -. {* If SEC_LINK_ONCE is set, this bitfield describes how the linker -. should handle duplicate sections. *} -.#define SEC_LINK_DUPLICATES 0x600000 -. -. {* This value for SEC_LINK_DUPLICATES means that duplicate -. sections with the same name should simply be discarded. *} -.#define SEC_LINK_DUPLICATES_DISCARD 0x0 -. -. {* This value for SEC_LINK_DUPLICATES means that the linker -. should warn if there are any duplicate sections, although -. it should still only link one copy. *} -.#define SEC_LINK_DUPLICATES_ONE_ONLY 0x200000 -. -. {* This value for SEC_LINK_DUPLICATES means that the linker -. should warn if any duplicate sections are a different size. *} -.#define SEC_LINK_DUPLICATES_SAME_SIZE 0x400000 -. -. {* This value for SEC_LINK_DUPLICATES means that the linker -. should warn if any duplicate sections contain different -. contents. *} -.#define SEC_LINK_DUPLICATES_SAME_CONTENTS 0x600000 -. -. {* This section was created by the linker as part of dynamic -. relocation or other arcane processing. It is skipped when -. going through the first-pass output, trusting that someone -. else up the line will take care of it later. *} -.#define SEC_LINKER_CREATED 0x800000 -. -. {* This section should not be subject to garbage collection. *} -.#define SEC_KEEP 0x1000000 -. -. {* This section contains "short" data, and should be placed -. "near" the GP. *} -.#define SEC_SMALL_DATA 0x2000000 -. -. {* This section contains data which may be shared with other -. executables or shared objects. *} -.#define SEC_SHARED 0x4000000 -. -. {* When a section with this flag is being linked, then if the size of -. the input section is less than a page, it should not cross a page -. boundary. If the size of the input section is one page or more, it -. should be aligned on a page boundary. *} -.#define SEC_BLOCK 0x8000000 -. -. {* Conditionally link this section; do not link if there are no -. references found to any symbol in the section. *} -.#define SEC_CLINK 0x10000000 -. -. {* Attempt to merge identical entities in the section. -. Entity size is given in the entsize field. *} -.#define SEC_MERGE 0x20000000 -. -. {* If given with SEC_MERGE, entities to merge are zero terminated -. strings where entsize specifies character size instead of fixed -. size entries. *} -.#define SEC_STRINGS 0x40000000 -. -. {* End of section flags. *} -. -. {* Some internal packed boolean fields. *} -. -. {* See the vma field. *} -. unsigned int user_set_vma : 1; -. -. {* Whether relocations have been processed. *} -. unsigned int reloc_done : 1; -. -. {* A mark flag used by some of the linker backends. *} -. unsigned int linker_mark : 1; -. -. {* Another mark flag used by some of the linker backends. Set for -. output sections that have a input section. *} -. unsigned int linker_has_input : 1; -. -. {* A mark flag used by some linker backends for garbage collection. *} -. unsigned int gc_mark : 1; -. -. {* Used by the ELF code to mark sections which have been allocated to segments. *} -. unsigned int segment_mark : 1; -. -. {* End of internal packed boolean fields. *} -. -. {* The virtual memory address of the section - where it will be -. at run time. The symbols are relocated against this. The -. user_set_vma flag is maintained by bfd; if it's not set, the -. backend can assign addresses (for example, in <<a.out>>, where -. the default address for <<.data>> is dependent on the specific -. target and various flags). *} -. -. bfd_vma vma; -. -. {* The load address of the section - where it would be in a -. rom image; really only used for writing section header -. information. *} -. -. bfd_vma lma; -. -. {* The size of the section in octets, as it will be output. -. Contains a value even if the section has no contents (e.g., the -. size of <<.bss>>). This will be filled in after relocation. *} -. -. bfd_size_type _cooked_size; -. -. {* The original size on disk of the section, in octets. Normally this -. value is the same as the size, but if some relaxing has -. been done, then this value will be bigger. *} -. -. bfd_size_type _raw_size; -. -. {* If this section is going to be output, then this value is the -. offset in *bytes* into the output section of the first byte in the -. input section (byte ==> smallest addressable unit on the -. target). In most cases, if this was going to start at the -. 100th octet (8-bit quantity) in the output section, this value -. would be 100. However, if the target byte size is 16 bits -. (bfd_octets_per_byte is "2"), this value would be 50. *} -. -. bfd_vma output_offset; -. -. {* The output section through which to map on output. *} -. -. struct sec *output_section; -. -. {* The alignment requirement of the section, as an exponent of 2 - -. e.g., 3 aligns to 2^3 (or 8). *} -. -. unsigned int alignment_power; -. -. {* If an input section, a pointer to a vector of relocation -. records for the data in this section. *} -. -. struct reloc_cache_entry *relocation; -. -. {* If an output section, a pointer to a vector of pointers to -. relocation records for the data in this section. *} -. -. struct reloc_cache_entry **orelocation; -. -. {* The number of relocation records in one of the above *} -. -. unsigned reloc_count; -. -. {* Information below is back end specific - and not always used -. or updated. *} -. -. {* File position of section data. *} -. -. file_ptr filepos; -. -. {* File position of relocation info. *} -. -. file_ptr rel_filepos; -. -. {* File position of line data. *} -. -. file_ptr line_filepos; -. -. {* Pointer to data for applications. *} -. -. PTR userdata; -. -. {* If the SEC_IN_MEMORY flag is set, this points to the actual -. contents. *} -. unsigned char *contents; -. -. {* Attached line number information. *} -. -. alent *lineno; -. -. {* Number of line number records. *} -. -. unsigned int lineno_count; -. -. {* Entity size for merging purposes. *} -. -. unsigned int entsize; -. -. {* Optional information about a COMDAT entry; NULL if not COMDAT. *} -. -. struct bfd_comdat_info *comdat; -. -. {* Points to the kept section if this section is a link-once section, -. and is discarded. *} -. struct sec *kept_section; -. -. {* When a section is being output, this value changes as more -. linenumbers are written out. *} -. -. file_ptr moving_line_filepos; -. -. {* What the section number is in the target world. *} -. -. int target_index; -. -. PTR used_by_bfd; -. -. {* If this is a constructor section then here is a list of the -. relocations created to relocate items within it. *} -. -. struct relent_chain *constructor_chain; -. -. {* The BFD which owns the section. *} -. -. bfd *owner; -. -. {* A symbol which points at this section only *} -. struct symbol_cache_entry *symbol; -. struct symbol_cache_entry **symbol_ptr_ptr; -. -. struct bfd_link_order *link_order_head; -. struct bfd_link_order *link_order_tail; -.} asection ; -. -.{* These sections are global, and are managed by BFD. The application -. and target back end are not permitted to change the values in -. these sections. New code should use the section_ptr macros rather -. than referring directly to the const sections. The const sections -. may eventually vanish. *} -.#define BFD_ABS_SECTION_NAME "*ABS*" -.#define BFD_UND_SECTION_NAME "*UND*" -.#define BFD_COM_SECTION_NAME "*COM*" -.#define BFD_IND_SECTION_NAME "*IND*" -. -.{* the absolute section *} -.extern const asection bfd_abs_section; -.#define bfd_abs_section_ptr ((asection *) &bfd_abs_section) -.#define bfd_is_abs_section(sec) ((sec) == bfd_abs_section_ptr) -.{* Pointer to the undefined section *} -.extern const asection bfd_und_section; -.#define bfd_und_section_ptr ((asection *) &bfd_und_section) -.#define bfd_is_und_section(sec) ((sec) == bfd_und_section_ptr) -.{* Pointer to the common section *} -.extern const asection bfd_com_section; -.#define bfd_com_section_ptr ((asection *) &bfd_com_section) -.{* Pointer to the indirect section *} -.extern const asection bfd_ind_section; -.#define bfd_ind_section_ptr ((asection *) &bfd_ind_section) -.#define bfd_is_ind_section(sec) ((sec) == bfd_ind_section_ptr) -. -.extern const struct symbol_cache_entry * const bfd_abs_symbol; -.extern const struct symbol_cache_entry * const bfd_com_symbol; -.extern const struct symbol_cache_entry * const bfd_und_symbol; -.extern const struct symbol_cache_entry * const bfd_ind_symbol; -.#define bfd_get_section_size_before_reloc(section) \ -. ((section)->reloc_done ? (abort (), (bfd_size_type) 1) \ -. : (section)->_raw_size) -.#define bfd_get_section_size_after_reloc(section) \ -. ((section)->reloc_done ? (section)->_cooked_size \ -. : (abort (), (bfd_size_type) 1)) -*/ - -/* We use a macro to initialize the static asymbol structures because - traditional C does not permit us to initialize a union member while - gcc warns if we don't initialize it. */ - /* the_bfd, name, value, attr, section [, udata] */ -#ifdef __STDC__ -#define GLOBAL_SYM_INIT(NAME, SECTION) \ - { 0, NAME, 0, BSF_SECTION_SYM, (asection *) SECTION, { 0 }} -#else -#define GLOBAL_SYM_INIT(NAME, SECTION) \ - { 0, NAME, 0, BSF_SECTION_SYM, (asection *) SECTION } -#endif - -/* These symbols are global, not specific to any BFD. Therefore, anything - that tries to change them is broken, and should be repaired. */ - -static const asymbol global_syms[] = -{ - GLOBAL_SYM_INIT (BFD_COM_SECTION_NAME, &bfd_com_section), - GLOBAL_SYM_INIT (BFD_UND_SECTION_NAME, &bfd_und_section), - GLOBAL_SYM_INIT (BFD_ABS_SECTION_NAME, &bfd_abs_section), - GLOBAL_SYM_INIT (BFD_IND_SECTION_NAME, &bfd_ind_section) -}; - -#define STD_SECTION(SEC, FLAGS, SYM, NAME, IDX) \ - const asymbol * const SYM = (asymbol *) &global_syms[IDX]; \ - const asection SEC = \ - /* name, id, index, next, flags, user_set_vma, reloc_done, */ \ - { NAME, IDX, 0, NULL, FLAGS, 0, 0, \ - \ - /* linker_mark, linker_has_input, gc_mark, segment_mark, */ \ - 0, 0, 1, 0, \ - \ - /* vma, lma, _cooked_size, _raw_size, */ \ - 0, 0, 0, 0, \ - \ - /* output_offset, output_section, alignment_power, */ \ - 0, (struct sec *) &SEC, 0, \ - \ - /* relocation, orelocation, reloc_count, filepos, rel_filepos, */ \ - NULL, NULL, 0, 0, 0, \ - \ - /* line_filepos, userdata, contents, lineno, lineno_count, */ \ - 0, NULL, NULL, NULL, 0, \ - \ - /* entsize, comdat, kept_section, moving_line_filepos, */ \ - 0, NULL, NULL, 0, \ - \ - /* target_index, used_by_bfd, constructor_chain, owner, */ \ - 0, NULL, NULL, NULL, \ - \ - /* symbol, */ \ - (struct symbol_cache_entry *) &global_syms[IDX], \ - \ - /* symbol_ptr_ptr, */ \ - (struct symbol_cache_entry **) &SYM, \ - \ - /* link_order_head, link_order_tail */ \ - NULL, NULL \ - } - -STD_SECTION (bfd_com_section, SEC_IS_COMMON, bfd_com_symbol, - BFD_COM_SECTION_NAME, 0); -STD_SECTION (bfd_und_section, 0, bfd_und_symbol, BFD_UND_SECTION_NAME, 1); -STD_SECTION (bfd_abs_section, 0, bfd_abs_symbol, BFD_ABS_SECTION_NAME, 2); -STD_SECTION (bfd_ind_section, 0, bfd_ind_symbol, BFD_IND_SECTION_NAME, 3); -#undef STD_SECTION - -/* -DOCDD -INODE -section prototypes, , typedef asection, Sections -SUBSECTION - Section prototypes - -These are the functions exported by the section handling part of BFD. -*/ - -/* -FUNCTION - bfd_get_section_by_name - -SYNOPSIS - asection *bfd_get_section_by_name(bfd *abfd, const char *name); - -DESCRIPTION - Run through @var{abfd} and return the one of the - <<asection>>s whose name matches @var{name}, otherwise <<NULL>>. - @xref{Sections}, for more information. - - This should only be used in special cases; the normal way to process - all sections of a given name is to use <<bfd_map_over_sections>> and - <<strcmp>> on the name (or better yet, base it on the section flags - or something else) for each section. -*/ - -asection * -bfd_get_section_by_name (abfd, name) - bfd *abfd; - const char *name; -{ - asection *sect; - - for (sect = abfd->sections; sect != NULL; sect = sect->next) - if (!strcmp (sect->name, name)) - return sect; - return NULL; -} - -/* -FUNCTION - bfd_get_unique_section_name - -SYNOPSIS - char *bfd_get_unique_section_name(bfd *abfd, - const char *templat, - int *count); - -DESCRIPTION - Invent a section name that is unique in @var{abfd} by tacking - a dot and a digit suffix onto the original @var{templat}. If - @var{count} is non-NULL, then it specifies the first number - tried as a suffix to generate a unique name. The value - pointed to by @var{count} will be incremented in this case. -*/ - -char * -bfd_get_unique_section_name (abfd, templat, count) - bfd *abfd; - const char *templat; - int *count; -{ - int num; - unsigned int len; - char *sname; - - len = strlen (templat); - sname = bfd_malloc (len + 8); - if (sname == NULL) - return NULL; - strcpy (sname, templat); - num = 1; - if (count != NULL) - num = *count; - - do - { - /* If we have a million sections, something is badly wrong. */ - if (num > 999999) - abort (); - sprintf (sname + len, ".%d", num++); - } - while (bfd_get_section_by_name (abfd, sname) != NULL); - - if (count != NULL) - *count = num; - return sname; -} - -/* -FUNCTION - bfd_make_section_old_way - -SYNOPSIS - asection *bfd_make_section_old_way(bfd *abfd, const char *name); - -DESCRIPTION - Create a new empty section called @var{name} - and attach it to the end of the chain of sections for the - BFD @var{abfd}. An attempt to create a section with a name which - is already in use returns its pointer without changing the - section chain. - - It has the funny name since this is the way it used to be - before it was rewritten.... - - Possible errors are: - o <<bfd_error_invalid_operation>> - - If output has already started for this BFD. - o <<bfd_error_no_memory>> - - If memory allocation fails. - -*/ - -asection * -bfd_make_section_old_way (abfd, name) - bfd *abfd; - const char *name; -{ - asection *sec = bfd_get_section_by_name (abfd, name); - if (sec == (asection *) NULL) - { - sec = bfd_make_section (abfd, name); - } - return sec; -} - -/* -FUNCTION - bfd_make_section_anyway - -SYNOPSIS - asection *bfd_make_section_anyway(bfd *abfd, const char *name); - -DESCRIPTION - Create a new empty section called @var{name} and attach it to the end of - the chain of sections for @var{abfd}. Create a new section even if there - is already a section with that name. - - Return <<NULL>> and set <<bfd_error>> on error; possible errors are: - o <<bfd_error_invalid_operation>> - If output has already started for @var{abfd}. - o <<bfd_error_no_memory>> - If memory allocation fails. -*/ - -sec_ptr -bfd_make_section_anyway (abfd, name) - bfd *abfd; - const char *name; -{ - static int section_id = 0x10; /* id 0 to 3 used by STD_SECTION. */ - asection *newsect; - asection **prev = &abfd->sections; - asection *sect = abfd->sections; - - if (abfd->output_has_begun) - { - bfd_set_error (bfd_error_invalid_operation); - return NULL; - } - - while (sect) - { - prev = §->next; - sect = sect->next; - } - - newsect = (asection *) bfd_zalloc (abfd, sizeof (asection)); - if (newsect == NULL) - return NULL; - - newsect->name = name; - newsect->id = section_id++; - newsect->index = abfd->section_count++; - newsect->flags = SEC_NO_FLAGS; - - newsect->userdata = NULL; - newsect->contents = NULL; - newsect->next = (asection *) NULL; - newsect->relocation = (arelent *) NULL; - newsect->reloc_count = 0; - newsect->line_filepos = 0; - newsect->owner = abfd; - newsect->comdat = NULL; - newsect->kept_section = NULL; - - /* Create a symbol whos only job is to point to this section. This is - useful for things like relocs which are relative to the base of a - section. */ - newsect->symbol = bfd_make_empty_symbol (abfd); - if (newsect->symbol == NULL) - { - bfd_release (abfd, newsect); - return NULL; - } - newsect->symbol->name = name; - newsect->symbol->value = 0; - newsect->symbol->section = newsect; - newsect->symbol->flags = BSF_SECTION_SYM; - - newsect->symbol_ptr_ptr = &newsect->symbol; - - if (BFD_SEND (abfd, _new_section_hook, (abfd, newsect)) != true) - { - bfd_release (abfd, newsect); - return NULL; - } - - *prev = newsect; - return newsect; -} - -/* -FUNCTION - bfd_make_section - -SYNOPSIS - asection *bfd_make_section(bfd *, const char *name); - -DESCRIPTION - Like <<bfd_make_section_anyway>>, but return <<NULL>> (without calling - bfd_set_error ()) without changing the section chain if there is already a - section named @var{name}. If there is an error, return <<NULL>> and set - <<bfd_error>>. -*/ - -asection * -bfd_make_section (abfd, name) - bfd *abfd; - const char *name; -{ - asection *sect = abfd->sections; - - if (strcmp (name, BFD_ABS_SECTION_NAME) == 0) - { - return bfd_abs_section_ptr; - } - if (strcmp (name, BFD_COM_SECTION_NAME) == 0) - { - return bfd_com_section_ptr; - } - if (strcmp (name, BFD_UND_SECTION_NAME) == 0) - { - return bfd_und_section_ptr; - } - - if (strcmp (name, BFD_IND_SECTION_NAME) == 0) - { - return bfd_ind_section_ptr; - } - - while (sect) - { - if (!strcmp (sect->name, name)) - return NULL; - sect = sect->next; - } - - /* The name is not already used; go ahead and make a new section. */ - return bfd_make_section_anyway (abfd, name); -} - -/* -FUNCTION - bfd_set_section_flags - -SYNOPSIS - boolean bfd_set_section_flags(bfd *abfd, asection *sec, flagword flags); - -DESCRIPTION - Set the attributes of the section @var{sec} in the BFD - @var{abfd} to the value @var{flags}. Return <<true>> on success, - <<false>> on error. Possible error returns are: - - o <<bfd_error_invalid_operation>> - - The section cannot have one or more of the attributes - requested. For example, a .bss section in <<a.out>> may not - have the <<SEC_HAS_CONTENTS>> field set. - -*/ - -/*ARGSUSED*/ -boolean -bfd_set_section_flags (abfd, section, flags) - bfd *abfd ATTRIBUTE_UNUSED; - sec_ptr section; - flagword flags; -{ -#if 0 - /* If you try to copy a text section from an input file (where it - has the SEC_CODE flag set) to an output file, this loses big if - the bfd_applicable_section_flags (abfd) doesn't have the SEC_CODE - set - which it doesn't, at least not for a.out. FIXME */ - - if ((flags & bfd_applicable_section_flags (abfd)) != flags) - { - bfd_set_error (bfd_error_invalid_operation); - return false; - } -#endif - - section->flags = flags; - return true; -} - -/* -FUNCTION - bfd_map_over_sections - -SYNOPSIS - void bfd_map_over_sections(bfd *abfd, - void (*func) (bfd *abfd, - asection *sect, - PTR obj), - PTR obj); - -DESCRIPTION - Call the provided function @var{func} for each section - attached to the BFD @var{abfd}, passing @var{obj} as an - argument. The function will be called as if by - -| func(abfd, the_section, obj); - - This is the prefered method for iterating over sections; an - alternative would be to use a loop: - -| section *p; -| for (p = abfd->sections; p != NULL; p = p->next) -| func(abfd, p, ...) - -*/ - -/*VARARGS2*/ -void -bfd_map_over_sections (abfd, operation, user_storage) - bfd *abfd; - void (*operation) PARAMS ((bfd * abfd, asection * sect, PTR obj)); - PTR user_storage; -{ - asection *sect; - unsigned int i = 0; - - for (sect = abfd->sections; sect != NULL; i++, sect = sect->next) - (*operation) (abfd, sect, user_storage); - - if (i != abfd->section_count) /* Debugging */ - abort (); -} - -/* -FUNCTION - bfd_set_section_size - -SYNOPSIS - boolean bfd_set_section_size(bfd *abfd, asection *sec, bfd_size_type val); - -DESCRIPTION - Set @var{sec} to the size @var{val}. If the operation is - ok, then <<true>> is returned, else <<false>>. - - Possible error returns: - o <<bfd_error_invalid_operation>> - - Writing has started to the BFD, so setting the size is invalid. - -*/ - -boolean -bfd_set_section_size (abfd, ptr, val) - bfd *abfd; - sec_ptr ptr; - bfd_size_type val; -{ - /* Once you've started writing to any section you cannot create or change - the size of any others. */ - - if (abfd->output_has_begun) - { - bfd_set_error (bfd_error_invalid_operation); - return false; - } - - ptr->_cooked_size = val; - ptr->_raw_size = val; - - return true; -} - -/* -FUNCTION - bfd_set_section_contents - -SYNOPSIS - boolean bfd_set_section_contents - (bfd *abfd, - asection *section, - PTR data, - file_ptr offset, - bfd_size_type count); - -DESCRIPTION - Sets the contents of the section @var{section} in BFD - @var{abfd} to the data starting in memory at @var{data}. The - data is written to the output section starting at offset - @var{offset} for @var{count} octets. - - Normally <<true>> is returned, else <<false>>. Possible error - returns are: - o <<bfd_error_no_contents>> - - The output section does not have the <<SEC_HAS_CONTENTS>> - attribute, so nothing can be written to it. - o and some more too - - This routine is front end to the back end function - <<_bfd_set_section_contents>>. - -*/ - -#define bfd_get_section_size_now(abfd,sec) \ -(sec->reloc_done \ - ? bfd_get_section_size_after_reloc (sec) \ - : bfd_get_section_size_before_reloc (sec)) - -boolean -bfd_set_section_contents (abfd, section, location, offset, count) - bfd *abfd; - sec_ptr section; - PTR location; - file_ptr offset; - bfd_size_type count; -{ - bfd_size_type sz; - - if (!(bfd_get_section_flags (abfd, section) & SEC_HAS_CONTENTS)) - { - bfd_set_error (bfd_error_no_contents); - return (false); - } - - if (offset < 0) - { - bad_val: - bfd_set_error (bfd_error_bad_value); - return false; - } - sz = bfd_get_section_size_now (abfd, section); - if ((bfd_size_type) offset > sz - || count > sz - || offset + count > sz) - goto bad_val; - - switch (abfd->direction) - { - case read_direction: - case no_direction: - bfd_set_error (bfd_error_invalid_operation); - return false; - - case write_direction: - break; - - case both_direction: - /* File is opened for update. `output_has_begun' some time ago when - the file was created. Do not recompute sections sizes or alignments - in _bfd_set_section_content. */ - abfd->output_has_begun = true; - break; - } - - /* Record a copy of the data in memory if desired. */ - if (section->contents - && location != section->contents + offset) - memcpy (section->contents + offset, location, count); - - if (BFD_SEND (abfd, _bfd_set_section_contents, - (abfd, section, location, offset, count))) - { - abfd->output_has_begun = true; - return true; - } - - return false; -} - -/* -FUNCTION - bfd_get_section_contents - -SYNOPSIS - boolean bfd_get_section_contents - (bfd *abfd, asection *section, PTR location, - file_ptr offset, bfd_size_type count); - -DESCRIPTION - Read data from @var{section} in BFD @var{abfd} - into memory starting at @var{location}. The data is read at an - offset of @var{offset} from the start of the input section, - and is read for @var{count} bytes. - - If the contents of a constructor with the <<SEC_CONSTRUCTOR>> - flag set are requested or if the section does not have the - <<SEC_HAS_CONTENTS>> flag set, then the @var{location} is filled - with zeroes. If no errors occur, <<true>> is returned, else - <<false>>. - -*/ -boolean -bfd_get_section_contents (abfd, section, location, offset, count) - bfd *abfd; - sec_ptr section; - PTR location; - file_ptr offset; - bfd_size_type count; -{ - bfd_size_type sz; - - if (section->flags & SEC_CONSTRUCTOR) - { - memset (location, 0, (unsigned) count); - return true; - } - - if (offset < 0) - { - bad_val: - bfd_set_error (bfd_error_bad_value); - return false; - } - /* Even if reloc_done is true, this function reads unrelocated - contents, so we want the raw size. */ - sz = section->_raw_size; - if ((bfd_size_type) offset > sz || count > sz || offset + count > sz) - goto bad_val; - - if (count == 0) - /* Don't bother. */ - return true; - - if ((section->flags & SEC_HAS_CONTENTS) == 0) - { - memset (location, 0, (unsigned) count); - return true; - } - - if ((section->flags & SEC_IN_MEMORY) != 0) - { - memcpy (location, section->contents + offset, (size_t) count); - return true; - } - - return BFD_SEND (abfd, _bfd_get_section_contents, - (abfd, section, location, offset, count)); -} - -/* -FUNCTION - bfd_copy_private_section_data - -SYNOPSIS - boolean bfd_copy_private_section_data(bfd *ibfd, asection *isec, bfd *obfd, asection *osec); - -DESCRIPTION - Copy private section information from @var{isec} in the BFD - @var{ibfd} to the section @var{osec} in the BFD @var{obfd}. - Return <<true>> on success, <<false>> on error. Possible error - returns are: - - o <<bfd_error_no_memory>> - - Not enough memory exists to create private data for @var{osec}. - -.#define bfd_copy_private_section_data(ibfd, isection, obfd, osection) \ -. BFD_SEND (obfd, _bfd_copy_private_section_data, \ -. (ibfd, isection, obfd, osection)) -*/ - -/* -FUNCTION - _bfd_strip_section_from_output - -SYNOPSIS - void _bfd_strip_section_from_output - (struct bfd_link_info *info, asection *section); - -DESCRIPTION - Remove @var{section} from the output. If the output section - becomes empty, remove it from the output bfd. @var{info} may - be NULL; if it is not, it is used to decide whether the output - section is empty. -*/ -void -_bfd_strip_section_from_output (info, s) - struct bfd_link_info *info; - asection *s; -{ - asection **spp, *os; - struct bfd_link_order *p, *pp; - boolean keep_os; - - /* Excise the input section from the link order. - - FIXME: For all calls that I can see to this function, the link - orders have not yet been set up. So why are we checking them? -- - Ian */ - os = s->output_section; - - /* Handle a section that wasn't output. */ - if (os == NULL) - return; - - for (p = os->link_order_head, pp = NULL; p != NULL; pp = p, p = p->next) - if (p->type == bfd_indirect_link_order - && p->u.indirect.section == s) - { - if (pp) - pp->next = p->next; - else - os->link_order_head = p->next; - if (!p->next) - os->link_order_tail = pp; - break; - } - - keep_os = os->link_order_head != NULL; - - if (! keep_os && info != NULL) - { - bfd *abfd; - for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next) - { - asection *is; - for (is = abfd->sections; is != NULL; is = is->next) - { - if (is != s && is->output_section == os) - break; - } - if (is != NULL) - break; - } - if (abfd != NULL) - keep_os = true; - } - - /* If the output section is empty, remove it too. Careful about sections - that have been discarded in the link script -- they are mapped to - bfd_abs_section, which has no owner. */ - if (!keep_os && os->owner != NULL) - { - for (spp = &os->owner->sections; *spp; spp = &(*spp)->next) - if (*spp == os) - { - *spp = os->next; - os->owner->section_count--; - break; - } - } -} |