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Diffstat (limited to 'bfd/section.c')
| -rw-r--r-- | bfd/section.c | 1075 |
1 files changed, 1075 insertions, 0 deletions
diff --git a/bfd/section.c b/bfd/section.c new file mode 100644 index 0000000..18778b5 --- /dev/null +++ b/bfd/section.c @@ -0,0 +1,1075 @@ +/* Object file "section" support for the BFD library. + Copyright (C) 1990, 91, 92, 93, 94, 95, 96, 1997 + 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 +. +.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; +. +. {* 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 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 +. +. {* 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; +. +. {* A mark flag used by some linker backends for garbage collection. *} +. unsigned int gc_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 bytes, 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 bytes. 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 into the output section of the first byte in the input +. section. E.g., if this was going to start at the 100th byte in +. the output section, this value would be 100. *} +. +. 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; +. +. {* 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(),1): (section)->_raw_size) +.#define bfd_get_section_size_after_reloc(section) \ +. ((section->reloc_done) ? (section)->_cooked_size: (abort(),1)) +*/ + +/* 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[] = +{ + /* the_bfd, name, value, attr, section [, udata] */ + {0, BFD_COM_SECTION_NAME, 0, BSF_SECTION_SYM, (asection *) &bfd_com_section}, + {0, BFD_UND_SECTION_NAME, 0, BSF_SECTION_SYM, (asection *) &bfd_und_section}, + {0, BFD_ABS_SECTION_NAME, 0, BSF_SECTION_SYM, (asection *) &bfd_abs_section}, + {0, BFD_IND_SECTION_NAME, 0, BSF_SECTION_SYM, (asection *) &bfd_ind_section}, +}; + +#define STD_SECTION(SEC, FLAGS, SYM, NAME, IDX) \ + const asymbol * const SYM = (asymbol *) &global_syms[IDX]; \ + const asection SEC = \ + { NAME, 0, 0, FLAGS, 0, 0, 0, 0, 0, 0, 0, 0, 0, (asection *) &SEC, \ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \ + (asymbol *) &global_syms[IDX], (asymbol **) &SYM, 0, 0 } + +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_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; +{ + 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->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; + + /* 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) + 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) + { + free (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; + 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} bytes. + + + + 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; + } + + 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 + (asection *section); + +DESCRIPTION + Remove @var{section} from the output. If the output section becomes + empty, remove it from the output bfd. +*/ +void +_bfd_strip_section_from_output (s) + asection *s; +{ + asection **spp, *os; + struct bfd_link_order *p, *pp; + + os = s->output_section; + 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) + { + /* Excise the input section. */ + if (pp) + pp->next = p->next; + else + os->link_order_head = p->next; + if (!p->next) + os->link_order_tail = pp; + + if (!os->link_order_head) + { + /* Excise the output section. */ + for (spp = &os->owner->sections; *spp; spp = &(*spp)->next) + if (*spp == os) + { + *spp = os->next; + os->owner->section_count--; + break; + } + } + break; + } +} |