X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=bfd%2Fsection.c;h=17f5b4c3d83f10f548c6366d05df3722f3c8a369;hb=c69ad65744134f0c28432cc7c5204b9950f0b2c7;hp=099f0bd1639ba4e2baebc5bfebc55a90be949b72;hpb=985fca129365a7bfa8e8e91b4d8b57d65f308583;p=deliverable%2Fbinutils-gdb.git diff --git a/bfd/section.c b/bfd/section.c index 099f0bd163..17f5b4c3d8 100644 --- a/bfd/section.c +++ b/bfd/section.c @@ -1,553 +1,1713 @@ -/*doc* -@section Sections -Sections are supported in bfd in @code{section.c}. +/* Object file "section" support for the BFD library. + Copyright (C) 1990-2020 Free Software Foundation, Inc. + Written by Cygnus Support. -The raw data contained within a bfd is maintained through the section -abstraction. A single bfd may have any number of sections, and keeps -hold of them by pointing to the first, each one points to the next in -the list. + 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 3 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., 51 Franklin Street - Fifth Floor, Boston, + MA 02110-1301, 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 <>. @menu -* Section Input:: -* Section Output:: -* typedef asection:: -* section prototypes:: +@* Section Input:: +@* Section Output:: +@* typedef asection:: +@* section prototypes:: @end menu -@node Section Input, Section Output,,Sections -@comment node-name, next, previous, up -@subsection Section Input -When a bfd is opened for reading, the section structures are created -and attatched to the bfd. - -Each section has a name which describes the section in the outside -world - for example, @code{a.out} would contain at least three -sections, called @code{.text}, @code{.data} and @code{.bss}. - -Sometimes a bfd will contain more than the 'natural' number of -sections. A back end may attatch other sections containing constructor -data, or an application may add a section (using bfd_make_section) to -the sections attatched to an already open bfd. For example, the linker -creates a supernumary section @code{COMMON} for each input file's bfd -to hold information about common storage. - -The raw data is not necessarily read in at the same time as the -section descriptor is created. Some targets may leave the data in -place until a @code{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. - -@node 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 attatched to the bfd in the same way as -input sections, data is written to the sections using -@code{bfd_set_section_contents}. - -The linker uses the fields @code{output_section} and -@code{output_offset} to create an output file. - -The data to be written comes from input sections attatched 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. - -Eg to create a section "O", starting at 0x100, 0x123 long, containing two -subsections, "A" at offset 0x0 (ie at vma 0x100) and "B" at offset -0x20 (ie at vma 0x120) the 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 --------| - -*- +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, <> 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 + <>) to the sections attached to an already open + BFD. For example, the linker creates an extra section + <> 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 <> 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. + +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 <>. + + Any program that creates or combines sections (e.g., the assembler + and linker) must use the <> fields <> and + <> to indicate the file sections to which each + section must be written. (If the section is being created from + scratch, <> should probably point to the section + itself and <> should probably be zero.) + + The data to be written comes from input sections attached + (via <> 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 <> + 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 <>. 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 "sysdep.h" #include "bfd.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 bfd_section +.{ +. {* 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. *} +. unsigned int id; +. +. {* A unique section number which can be used by assembler to +. distinguish different sections with the same section name. *} +. unsigned int section_id; +. +. {* Which section in the bfd; 0..n-1 as sections are created in a bfd. *} +. unsigned int index; +. +. {* The next section in the list belonging to the BFD, or NULL. *} +. struct bfd_section *next; +. +. {* The previous section in the list belonging to the BFD, or NULL. *} +. struct bfd_section *prev; +. +. {* 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 0x0 +. +. {* Tells the OS to allocate space for this section when loading. +. This is clear for a section containing debug information only. *} +.#define SEC_ALLOC 0x1 +. +. {* Tells the OS to load the section from the file when loading. +. This is clear for a .bss section. *} +.#define SEC_LOAD 0x2 +. +. {* The section contains data still to be relocated, so there is +. some relocation information too. *} +.#define SEC_RELOC 0x4 +. +. {* A signal to the OS that the section contains read only data. *} +.#define SEC_READONLY 0x8 +. +. {* The section contains code only. *} +.#define SEC_CODE 0x10 +. +. {* The section contains data only. *} +.#define SEC_DATA 0x20 +. +. {* The section will reside in ROM. *} +.#define SEC_ROM 0x40 +. +. {* The section contains constructor information. This section +. type is used by the linker to create lists of constructors and +. destructors used by <>. 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 0x80 +. +. {* The section has contents - a data section could be +. <> | <>; a debug section could be +. <> *} +.#define SEC_HAS_CONTENTS 0x100 +. +. {* An instruction to the linker to not output the section +. even if it has information which would normally be written. *} +.#define SEC_NEVER_LOAD 0x200 +. +. {* The section contains thread local data. *} +.#define SEC_THREAD_LOCAL 0x400 +. +. {* The section's size is fixed. Generic linker code will not +. recalculate it and it is up to whoever has set this flag to +. get the size right. *} +.#define SEC_FIXED_SIZE 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 0x1000 +. +. {* 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 0x2000 +. +. {* 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 0x4000 +. +. {* 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 0x8000 +. +. {* The contents of this section are to be sorted based on the sum of +. the symbol and addend values specified by the associated relocation +. entries. Entries without associated relocation entries will be +. appended to the end of the section in an unspecified order. *} +.#define SEC_SORT_ENTRIES 0x10000 +. +. {* 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 0x20000 +. +. {* If SEC_LINK_ONCE is set, this bitfield describes how the linker +. should handle duplicate sections. *} +.#define SEC_LINK_DUPLICATES 0xc0000 +. +. {* 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 0x40000 +. +. {* 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 0x80000 +. +. {* 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 \ +. (SEC_LINK_DUPLICATES_ONE_ONLY | SEC_LINK_DUPLICATES_SAME_SIZE) +. +. {* 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 0x100000 +. +. {* This section contains a section ID to distinguish different +. sections with the same section name. *} +.#define SEC_ASSEMBLER_SECTION_ID 0x100000 +. +. {* This section should not be subject to garbage collection. +. Also set to inform the linker that this section should not be +. listed in the link map as discarded. *} +.#define SEC_KEEP 0x200000 +. +. {* This section contains "short" data, and should be placed +. "near" the GP. *} +.#define SEC_SMALL_DATA 0x400000 +. +. {* Attempt to merge identical entities in the section. +. Entity size is given in the entsize field. *} +.#define SEC_MERGE 0x800000 +. +. {* 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 0x1000000 +. +. {* This section contains data about section groups. *} +.#define SEC_GROUP 0x2000000 +. +. {* 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 0x4000000 +. +. {* This input section should be copied to output in reverse order +. as an array of pointers. This is for ELF linker internal use +. only. *} +.#define SEC_ELF_REVERSE_COPY 0x4000000 +. +. {* This section contains data which may be shared with other +. executables or shared objects. This is for COFF only. *} +.#define SEC_COFF_SHARED 0x8000000 +. +. {* This section should be compressed. This is for ELF linker +. internal use only. *} +.#define SEC_ELF_COMPRESS 0x8000000 +. +. {* 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. This is for TI +. TMS320C54X only. *} +.#define SEC_TIC54X_BLOCK 0x10000000 +. +. {* This section should be renamed. This is for ELF linker +. internal use only. *} +.#define SEC_ELF_RENAME 0x10000000 +. +. {* Conditionally link this section; do not link if there are no +. references found to any symbol in the section. This is for TI +. TMS320C54X only. *} +.#define SEC_TIC54X_CLINK 0x20000000 +. +. {* This section contains vliw code. This is for Toshiba MeP only. *} +.#define SEC_MEP_VLIW 0x20000000 +. +. {* All symbols, sizes and relocations in this section are octets +. instead of bytes. Required for DWARF debug sections as DWARF +. information is organized in octets, not bytes. *} +.#define SEC_ELF_OCTETS 0x40000000 +. +. {* Indicate that section has the no read flag set. This happens +. when memory read flag isn't set. *} +.#define SEC_COFF_NOREAD 0x40000000 +. +. {* Indicate that section has the purecode flag set. *} +.#define SEC_ELF_PURECODE 0x80000000 +. +. {* End of section flags. *} +. +. {* Some internal packed boolean fields. *} +. +. {* See the vma field. *} +. unsigned int user_set_vma : 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 an input section. *} +. unsigned int linker_has_input : 1; +. +. {* Mark flag used by some linker backends for garbage collection. *} +. unsigned int gc_mark : 1; +. +. {* Section compression status. *} +. unsigned int compress_status : 2; +.#define COMPRESS_SECTION_NONE 0 +.#define COMPRESS_SECTION_DONE 1 +.#define DECOMPRESS_SECTION_SIZED 2 +. +. {* The following flags are used by the ELF linker. *} +. +. {* Mark sections which have been allocated to segments. *} +. unsigned int segment_mark : 1; +. +. {* Type of sec_info information. *} +. unsigned int sec_info_type:3; +.#define SEC_INFO_TYPE_NONE 0 +.#define SEC_INFO_TYPE_STABS 1 +.#define SEC_INFO_TYPE_MERGE 2 +.#define SEC_INFO_TYPE_EH_FRAME 3 +.#define SEC_INFO_TYPE_JUST_SYMS 4 +.#define SEC_INFO_TYPE_TARGET 5 +.#define SEC_INFO_TYPE_EH_FRAME_ENTRY 6 +. +. {* Nonzero if this section uses RELA relocations, rather than REL. *} +. unsigned int use_rela_p:1; +. +. {* Bits used by various backends. The generic code doesn't touch +. these fields. *} +. +. unsigned int sec_flg0:1; +. unsigned int sec_flg1:1; +. unsigned int sec_flg2:1; +. unsigned int sec_flg3:1; +. unsigned int sec_flg4:1; +. unsigned int sec_flg5:1; +. +. {* 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 <>, 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>>). *} +. bfd_size_type size; +. +. {* For input sections, the original size on disk of the section, in +. octets. This field should be set for any section whose size is +. changed by linker relaxation. It is required for sections where +. the linker relaxation scheme doesn't cache altered section and +. reloc contents (stabs, eh_frame, SEC_MERGE, some coff relaxing +. targets), and thus the original size needs to be kept to read the +. section multiple times. For output sections, rawsize holds the +. section size calculated on a previous linker relaxation pass. *} +. bfd_size_type rawsize; +. +. {* The compressed size of the section in octets. *} +. bfd_size_type compressed_size; +. +. {* Relaxation table. *} +. struct relax_table *relax; +. +. {* Count of used relaxation table entries. *} +. int relax_count; +. +. +. {* 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 bfd_section *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. *} +. void *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; +. +. {* Points to the kept section if this section is a link-once section, +. and is discarded. *} +. struct bfd_section *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; +. +. void *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 bfd_symbol *symbol; +. struct bfd_symbol **symbol_ptr_ptr; +. +. {* Early in the link process, map_head and map_tail are used to build +. a list of input sections attached to an output section. Later, +. output sections use these fields for a list of bfd_link_order +. structs. The linked_to_symbol_name field is for ELF assembler +. internal use. *} +. union { +. struct bfd_link_order *link_order; +. struct bfd_section *s; +. const char *linked_to_symbol_name; +. } map_head, map_tail; +. {* Points to the output section this section is already assigned to, if any. +. This is used when support for non-contiguous memory regions is enabled. *} +. struct bfd_section *already_assigned; +. +.} asection; +. +.{* Relax table contains information about instructions which can +. be removed by relaxation -- replacing a long address with a +. short address. *} +.struct relax_table { +. {* Address where bytes may be deleted. *} +. bfd_vma addr; +. +. {* Number of bytes to be deleted. *} +. int size; +.}; +. +.static inline const char * +.bfd_section_name (const asection *sec) +.{ +. return sec->name; +.} +. +.static inline bfd_size_type +.bfd_section_size (const asection *sec) +.{ +. return sec->size; +.} +. +.static inline bfd_vma +.bfd_section_vma (const asection *sec) +.{ +. return sec->vma; +.} +. +.static inline bfd_vma +.bfd_section_lma (const asection *sec) +.{ +. return sec->lma; +.} +. +.static inline unsigned int +.bfd_section_alignment (const asection *sec) +.{ +. return sec->alignment_power; +.} +. +.static inline flagword +.bfd_section_flags (const asection *sec) +.{ +. return sec->flags; +.} +. +.static inline void * +.bfd_section_userdata (const asection *sec) +.{ +. return sec->userdata; +.} +.static inline bfd_boolean +.bfd_is_com_section (const asection *sec) +.{ +. return (sec->flags & SEC_IS_COMMON) != 0; +.} +. +.{* Note: the following are provided as inline functions rather than macros +. because not all callers use the return value. A macro implementation +. would use a comma expression, eg: "((ptr)->foo = val, TRUE)" and some +. compilers will complain about comma expressions that have no effect. *} +.static inline bfd_boolean +.bfd_set_section_userdata (asection *sec, void *val) +.{ +. sec->userdata = val; +. return TRUE; +.} +. +.static inline bfd_boolean +.bfd_set_section_vma (asection *sec, bfd_vma val) +.{ +. sec->vma = sec->lma = val; +. sec->user_set_vma = TRUE; +. return TRUE; +.} +. +.static inline bfd_boolean +.bfd_set_section_lma (asection *sec, bfd_vma val) +.{ +. sec->lma = val; +. return TRUE; +.} +. +.static inline bfd_boolean +.bfd_set_section_alignment (asection *sec, unsigned int val) +.{ +. sec->alignment_power = val; +. return TRUE; +.} +. +.{* 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. *} +.extern asection _bfd_std_section[4]; +. +.#define BFD_ABS_SECTION_NAME "*ABS*" +.#define BFD_UND_SECTION_NAME "*UND*" +.#define BFD_COM_SECTION_NAME "*COM*" +.#define BFD_IND_SECTION_NAME "*IND*" +. +.{* Pointer to the common section. *} +.#define bfd_com_section_ptr (&_bfd_std_section[0]) +.{* Pointer to the undefined section. *} +.#define bfd_und_section_ptr (&_bfd_std_section[1]) +.{* Pointer to the absolute section. *} +.#define bfd_abs_section_ptr (&_bfd_std_section[2]) +.{* Pointer to the indirect section. *} +.#define bfd_ind_section_ptr (&_bfd_std_section[3]) +. +.static inline bfd_boolean +.bfd_is_und_section (const asection *sec) +.{ +. return sec == bfd_und_section_ptr; +.} +. +.static inline bfd_boolean +.bfd_is_abs_section (const asection *sec) +.{ +. return sec == bfd_abs_section_ptr; +.} +. +.static inline bfd_boolean +.bfd_is_ind_section (const asection *sec) +.{ +. return sec == bfd_ind_section_ptr; +.} +. +.static inline bfd_boolean +.bfd_is_const_section (const asection *sec) +.{ +. return (sec >= _bfd_std_section +. && sec < _bfd_std_section + (sizeof (_bfd_std_section) +. / sizeof (_bfd_std_section[0]))); +.} +. +.{* Return TRUE if input section SEC has been discarded. *} +.static inline bfd_boolean +.discarded_section (const asection *sec) +.{ +. return (!bfd_is_abs_section (sec) +. && bfd_is_abs_section (sec->output_section) +. && sec->sec_info_type != SEC_INFO_TYPE_MERGE +. && sec->sec_info_type != SEC_INFO_TYPE_JUST_SYMS); +.} +. +.#define BFD_FAKE_SECTION(SEC, SYM, NAME, IDX, FLAGS) \ +. {* name, id, section_id, index, next, prev, flags, user_set_vma, *} \ +. { NAME, IDX, 0, 0, NULL, NULL, FLAGS, 0, \ +. \ +. {* linker_mark, linker_has_input, gc_mark, decompress_status, *} \ +. 0, 0, 1, 0, \ +. \ +. {* segment_mark, sec_info_type, use_rela_p, *} \ +. 0, 0, 0, \ +. \ +. {* sec_flg0, sec_flg1, sec_flg2, sec_flg3, sec_flg4, sec_flg5, *} \ +. 0, 0, 0, 0, 0, 0, \ +. \ +. {* vma, lma, size, rawsize, compressed_size, relax, relax_count, *} \ +. 0, 0, 0, 0, 0, 0, 0, \ +. \ +. {* output_offset, output_section, alignment_power, *} \ +. 0, &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, kept_section, moving_line_filepos, *} \ +. 0, NULL, 0, \ +. \ +. {* target_index, used_by_bfd, constructor_chain, owner, *} \ +. 0, NULL, NULL, NULL, \ +. \ +. {* symbol, symbol_ptr_ptr, *} \ +. (struct bfd_symbol *) SYM, &SEC.symbol, \ +. \ +. {* map_head, map_tail, already_assigned *} \ +. { NULL }, { NULL }, NULL \ +. \ +. } +. +.{* 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, SECTION, { 0 }} +.#else +.#define GLOBAL_SYM_INIT(NAME, SECTION) \ +. { 0, NAME, 0, BSF_SECTION_SYM, SECTION } +.#endif +. +*/ +/* These symbols are global, not specific to any BFD. Therefore, anything + that tries to change them is broken, and should be repaired. */ -/*doc* -@node typedef asection,section prototypes,Section Output,Sections -@subsection typedef asection -*/ +static const asymbol global_syms[] = +{ + GLOBAL_SYM_INIT (BFD_COM_SECTION_NAME, bfd_com_section_ptr), + GLOBAL_SYM_INIT (BFD_UND_SECTION_NAME, bfd_und_section_ptr), + GLOBAL_SYM_INIT (BFD_ABS_SECTION_NAME, bfd_abs_section_ptr), + GLOBAL_SYM_INIT (BFD_IND_SECTION_NAME, bfd_ind_section_ptr) +}; + +#define STD_SECTION(NAME, IDX, FLAGS) \ + BFD_FAKE_SECTION(_bfd_std_section[IDX], &global_syms[IDX], NAME, IDX, FLAGS) + +asection _bfd_std_section[] = { + STD_SECTION (BFD_COM_SECTION_NAME, 0, SEC_IS_COMMON), + STD_SECTION (BFD_UND_SECTION_NAME, 1, 0), + STD_SECTION (BFD_ABS_SECTION_NAME, 2, 0), + STD_SECTION (BFD_IND_SECTION_NAME, 3, 0) +}; +#undef STD_SECTION + +/* Initialize an entry in the section hash table. */ + +struct bfd_hash_entry * +bfd_section_hash_newfunc (struct bfd_hash_entry *entry, + struct bfd_hash_table *table, + const char *string) +{ + /* Allocate the structure if it has not already been allocated by a + subclass. */ + if (entry == NULL) + { + entry = (struct bfd_hash_entry *) + bfd_hash_allocate (table, sizeof (struct section_hash_entry)); + if (entry == NULL) + return entry; + } + + /* Call the allocation method of the superclass. */ + entry = bfd_hash_newfunc (entry, table, string); + if (entry != NULL) + memset (&((struct section_hash_entry *) entry)->section, 0, + sizeof (asection)); + + return entry; +} -/*proto* -The shape of a section struct: +#define section_hash_lookup(table, string, create, copy) \ + ((struct section_hash_entry *) \ + bfd_hash_lookup ((table), (string), (create), (copy))) -*+++ +/* Create a symbol whose only job is to point to this section. This + is useful for things like relocs which are relative to the base + of a section. */ -$typedef struct sec { +bfd_boolean +_bfd_generic_new_section_hook (bfd *abfd, asection *newsect) +{ + newsect->symbol = bfd_make_empty_symbol (abfd); + if (newsect->symbol == NULL) + return FALSE; -The name of the section, the name isn't a copy, the pointer is -the same as that passed to bfd_make_section. + newsect->symbol->name = newsect->name; + newsect->symbol->value = 0; + newsect->symbol->section = newsect; + newsect->symbol->flags = BSF_SECTION_SYM; -$ CONST char *name; + newsect->symbol_ptr_ptr = &newsect->symbol; + return TRUE; +} -The next section in the list belonging to the bfd, or NULL. +unsigned int _bfd_section_id = 0x10; /* id 0 to 3 used by STD_SECTION. */ -$ struct sec *next; +/* Initializes a new section. NEWSECT->NAME is already set. */ -The field flags contains attributes of the section. Some of these -flags are read in from the object file, and some are synthesized from -other information. +static asection * +bfd_section_init (bfd *abfd, asection *newsect) +{ + newsect->id = _bfd_section_id; + newsect->index = abfd->section_count; + newsect->owner = abfd; -$flagword flags; + if (! BFD_SEND (abfd, _new_section_hook, (abfd, newsect))) + return NULL; + _bfd_section_id++; + abfd->section_count++; + bfd_section_list_append (abfd, newsect); + return newsect; +} -$#define SEC_NO_FLAGS 0x000 +/* +DOCDD +INODE +section prototypes, , typedef asection, Sections +SUBSECTION + Section prototypes -Tells the OS to allocate space for this section when loaded. -This would clear for a section containing debug information only. +These are the functions exported by the section handling part of BFD. +*/ -$#define SEC_ALLOC 0x001 +/* +FUNCTION + bfd_section_list_clear -Tells the OS to load the section from the file when loading. -This would be clear for a .bss section +SYNOPSIS + void bfd_section_list_clear (bfd *); -$#define SEC_LOAD 0x002 +DESCRIPTION + Clears the section list, and also resets the section count and + hash table entries. +*/ -The section contains data still to be relocated, so there will be some -relocation information too. +void +bfd_section_list_clear (bfd *abfd) +{ + abfd->sections = NULL; + abfd->section_last = NULL; + abfd->section_count = 0; + memset (abfd->section_htab.table, 0, + abfd->section_htab.size * sizeof (struct bfd_hash_entry *)); + abfd->section_htab.count = 0; +} -$#define SEC_RELOC 0x004 +/* +FUNCTION + bfd_get_section_by_name -Obsolete ? +SYNOPSIS + asection *bfd_get_section_by_name (bfd *abfd, const char *name); -$#define SEC_BALIGN 0x008 +DESCRIPTION + Return the most recently created section attached to @var{abfd} + named @var{name}. Return NULL if no such section exists. +*/ -A signal to the OS that the section contains read only data. +asection * +bfd_get_section_by_name (bfd *abfd, const char *name) +{ + struct section_hash_entry *sh; -$#define SEC_READONLY 0x010 + sh = section_hash_lookup (&abfd->section_htab, name, FALSE, FALSE); + if (sh != NULL) + return &sh->section; -The section contains code only. + return NULL; +} -$#define SEC_CODE 0x020 +/* +FUNCTION + bfd_get_next_section_by_name -The section contains data only. +SYNOPSIS + asection *bfd_get_next_section_by_name (bfd *ibfd, asection *sec); -$#define SEC_DATA 0x040 +DESCRIPTION + Given @var{sec} is a section returned by @code{bfd_get_section_by_name}, + return the next most recently created section attached to the same + BFD with the same name, or if no such section exists in the same BFD and + IBFD is non-NULL, the next section with the same name in any input + BFD following IBFD. Return NULL on finding no section. +*/ -The section will reside in ROM. +asection * +bfd_get_next_section_by_name (bfd *ibfd, asection *sec) +{ + struct section_hash_entry *sh; + const char *name; + unsigned long hash; + + sh = ((struct section_hash_entry *) + ((char *) sec - offsetof (struct section_hash_entry, section))); + + hash = sh->root.hash; + name = sec->name; + for (sh = (struct section_hash_entry *) sh->root.next; + sh != NULL; + sh = (struct section_hash_entry *) sh->root.next) + if (sh->root.hash == hash + && strcmp (sh->root.string, name) == 0) + return &sh->section; + + if (ibfd != NULL) + { + while ((ibfd = ibfd->link.next) != NULL) + { + asection *s = bfd_get_section_by_name (ibfd, name); + if (s != NULL) + return s; + } + } -$#define SEC_ROM 0x080 + return NULL; +} -The section contains constructor information. This section type is -used by the linker to create lists of constructors and destructors -used by @code{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 -(eg @code{__CTOR_LIST__}), attatches the symbol to it and builds a -relocation. To build the lists of constructors, all the linker has to -to is catenate all the sections called @code{__CTOR_LIST__} and -relocte the data contained within - exactly the operations it would -peform on standard data. +/* +FUNCTION + bfd_get_linker_section -$#define SEC_CONSTRUCTOR 0x100 +SYNOPSIS + asection *bfd_get_linker_section (bfd *abfd, const char *name); -The section has contents - a bss section could be -@code{SEC_ALLOC} | @code{SEC_HAS_CONTENTS}, a debug section could be -@code{SEC_HAS_CONTENTS} +DESCRIPTION + Return the linker created section attached to @var{abfd} + named @var{name}. Return NULL if no such section exists. +*/ -$#define SEC_HAS_CONTENTS 0x200 +asection * +bfd_get_linker_section (bfd *abfd, const char *name) +{ + asection *sec = bfd_get_section_by_name (abfd, name); -An instruction to the linker not to output sections containing -this flag even if they have information which would normally be written. + while (sec != NULL && (sec->flags & SEC_LINKER_CREATED) == 0) + sec = bfd_get_next_section_by_name (NULL, sec); + return sec; +} -$#define SEC_NEVER_LOAD 0x400 +/* +FUNCTION + bfd_get_section_by_name_if -The base address of the section in the address space of the target. +SYNOPSIS + asection *bfd_get_section_by_name_if + (bfd *abfd, + const char *name, + bfd_boolean (*func) (bfd *abfd, asection *sect, void *obj), + void *obj); -$ bfd_vma vma; +DESCRIPTION + Call the provided function @var{func} for each section + attached to the BFD @var{abfd} whose name matches @var{name}, + passing @var{obj} as an argument. The function will be called + as if by -The size of the section in bytes of the loaded section. This contains -a value even if the section has no contents (eg, the size of @code{.bss}). +| func (abfd, the_section, obj); -$ bfd_size_type size; + It returns the first section for which @var{func} returns true, + otherwise <>. -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. Eg, if this was going to start at the 100th byte in the -output section, this value would be 100. +*/ -$ bfd_vma output_offset; +asection * +bfd_get_section_by_name_if (bfd *abfd, const char *name, + bfd_boolean (*operation) (bfd *, + asection *, + void *), + void *user_storage) +{ + struct section_hash_entry *sh; + unsigned long hash; -The output section through which to map on output. + sh = section_hash_lookup (&abfd->section_htab, name, FALSE, FALSE); + if (sh == NULL) + return NULL; -$ struct sec *output_section; + hash = sh->root.hash; + for (; sh != NULL; sh = (struct section_hash_entry *) sh->root.next) + if (sh->root.hash == hash + && strcmp (sh->root.string, name) == 0 + && (*operation) (abfd, &sh->section, user_storage)) + return &sh->section; -The alignment requirement of the section, as an exponent - eg 3 -aligns to 2^3 (or 8) + return NULL; +} -$ unsigned int alignment_power; +/* +FUNCTION + bfd_get_unique_section_name -If an input section, a pointer to a vector of relocation records for -the data in this section. +SYNOPSIS + char *bfd_get_unique_section_name + (bfd *abfd, const char *templat, int *count); -$ struct reloc_cache_entry *relocation; +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. +*/ -If an output section, a pointer to a vector of pointers to -relocation records for the data in this section. +char * +bfd_get_unique_section_name (bfd *abfd, const char *templat, int *count) +{ + int num; + unsigned int len; + char *sname; -$ struct reloc_cache_entry **orelocation; + len = strlen (templat); + sname = (char *) bfd_malloc (len + 8); + if (sname == NULL) + return NULL; + memcpy (sname, templat, len); + 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 (section_hash_lookup (&abfd->section_htab, sname, FALSE, FALSE)); + + if (count != NULL) + *count = num; + return sname; +} -The number of relocation records in one of the above +/* +FUNCTION + bfd_make_section_old_way -$ unsigned reloc_count; +SYNOPSIS + asection *bfd_make_section_old_way (bfd *abfd, const char *name); -Which section is it 0..nth +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. -$ int index; + It has the funny name since this is the way it used to be + before it was rewritten.... -Information below is back end specific - and not always used or -updated + Possible errors are: + o <> - + If output has already started for this BFD. + o <> - + If memory allocation fails. -File position of section data +*/ -$ file_ptr filepos; -File position of relocation info +asection * +bfd_make_section_old_way (bfd *abfd, const char *name) +{ + asection *newsect; + + if (abfd->output_has_begun) + { + bfd_set_error (bfd_error_invalid_operation); + return NULL; + } + + if (strcmp (name, BFD_ABS_SECTION_NAME) == 0) + newsect = bfd_abs_section_ptr; + else if (strcmp (name, BFD_COM_SECTION_NAME) == 0) + newsect = bfd_com_section_ptr; + else if (strcmp (name, BFD_UND_SECTION_NAME) == 0) + newsect = bfd_und_section_ptr; + else if (strcmp (name, BFD_IND_SECTION_NAME) == 0) + newsect = bfd_ind_section_ptr; + else + { + struct section_hash_entry *sh; + + sh = section_hash_lookup (&abfd->section_htab, name, TRUE, FALSE); + if (sh == NULL) + return NULL; + + newsect = &sh->section; + if (newsect->name != NULL) + { + /* Section already exists. */ + return newsect; + } + + newsect->name = name; + return bfd_section_init (abfd, newsect); + } + + /* Call new_section_hook when "creating" the standard abs, com, und + and ind sections to tack on format specific section data. + Also, create a proper section symbol. */ + if (! BFD_SEND (abfd, _new_section_hook, (abfd, newsect))) + return NULL; + return newsect; +} -$ file_ptr rel_filepos; +/* +FUNCTION + bfd_make_section_anyway_with_flags -File position of line data +SYNOPSIS + asection *bfd_make_section_anyway_with_flags + (bfd *abfd, const char *name, flagword flags); -$ file_ptr line_filepos; +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. Also set the attributes of the + new section to the value @var{flags}. -Pointer to data for applications + Return <> and set <> on error; possible errors are: + o <> - If output has already started for @var{abfd}. + o <> - If memory allocation fails. +*/ -$ PTR userdata; +sec_ptr +bfd_make_section_anyway_with_flags (bfd *abfd, const char *name, + flagword flags) +{ + struct section_hash_entry *sh; + asection *newsect; -$ struct lang_output_section *otheruserdata; + if (abfd->output_has_begun) + { + bfd_set_error (bfd_error_invalid_operation); + return NULL; + } -Attached line number information + sh = section_hash_lookup (&abfd->section_htab, name, TRUE, FALSE); + if (sh == NULL) + return NULL; -$ alent *lineno; -Number of line number records + newsect = &sh->section; + if (newsect->name != NULL) + { + /* We are making a section of the same name. Put it in the + section hash table. Even though we can't find it directly by a + hash lookup, we'll be able to find the section by traversing + sh->root.next quicker than looking at all the bfd sections. */ + struct section_hash_entry *new_sh; + new_sh = (struct section_hash_entry *) + bfd_section_hash_newfunc (NULL, &abfd->section_htab, name); + if (new_sh == NULL) + return NULL; + + new_sh->root = sh->root; + sh->root.next = &new_sh->root; + newsect = &new_sh->section; + } + + newsect->flags = flags; + newsect->name = name; + return bfd_section_init (abfd, newsect); +} -$ unsigned int lineno_count; +/* +FUNCTION + bfd_make_section_anyway -When a section is being output, this value changes as more -linenumbers are written out +SYNOPSIS + asection *bfd_make_section_anyway (bfd *abfd, const char *name); -$ file_ptr moving_line_filepos; +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. -what the section number is in the target world + Return <> and set <> on error; possible errors are: + o <> - If output has already started for @var{abfd}. + o <> - If memory allocation fails. +*/ -$ unsigned int target_index; +sec_ptr +bfd_make_section_anyway (bfd *abfd, const char *name) +{ + return bfd_make_section_anyway_with_flags (abfd, name, 0); +} -$ PTR used_by_bfd; +/* +FUNCTION + bfd_make_section_with_flags -If this is a constructor section then here is a list of the -relocations created to relocate items within it. +SYNOPSIS + asection *bfd_make_section_with_flags + (bfd *, const char *name, flagword flags); -$ struct relent_chain *constructor_chain; +DESCRIPTION + Like <>, but return <> (without calling + bfd_set_error ()) without changing the section chain if there is already a + section named @var{name}. Also set the attributes of the new section to + the value @var{flags}. If there is an error, return <> and set + <>. +*/ -The bfd which owns the section. +asection * +bfd_make_section_with_flags (bfd *abfd, const char *name, + flagword flags) +{ + struct section_hash_entry *sh; + asection *newsect; + + if (abfd == NULL || name == NULL || abfd->output_has_begun) + { + bfd_set_error (bfd_error_invalid_operation); + return NULL; + } + + if (strcmp (name, BFD_ABS_SECTION_NAME) == 0 + || strcmp (name, BFD_COM_SECTION_NAME) == 0 + || strcmp (name, BFD_UND_SECTION_NAME) == 0 + || strcmp (name, BFD_IND_SECTION_NAME) == 0) + return NULL; -$ bfd *owner; + sh = section_hash_lookup (&abfd->section_htab, name, TRUE, FALSE); + if (sh == NULL) + return NULL; -$} asection ; + newsect = &sh->section; + if (newsect->name != NULL) + { + /* Section already exists. */ + return NULL; + } -*--- + newsect->name = name; + newsect->flags = flags; + return bfd_section_init (abfd, newsect); +} -*/ +/* +FUNCTION + bfd_make_section -/*doc* -@node section prototypes,Section,typedef section,Sections -@subsection section prototypes +SYNOPSIS + asection *bfd_make_section (bfd *, const char *name); +DESCRIPTION + Like <>, but return <> (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 <> and set + <>. */ -/*proto* bfd_get_section_by_name -Runs through the provided @var{abfd} and returns the @code{asection} -who's name matches that provided, otherwise NULL. @xref{Sections}, for more information. -*; PROTO(asection *, bfd_get_section_by_name, - (bfd *abfd, CONST char *name)); -*/ asection * -DEFUN(bfd_get_section_by_name,(abfd, name), - bfd *abfd AND - CONST char *name) +bfd_make_section (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; + return bfd_make_section_with_flags (abfd, name, 0); } +/* +FUNCTION + bfd_set_section_flags -/*proto* bfd_make_section -This function creates a new empty section called @var{name} and attatches it -to the end of the chain of sections for @var{bfd}. An attempt to -create a section with a name which is already in use, returns the old -section by that name instead. +SYNOPSIS + bfd_boolean bfd_set_section_flags (asection *sec, flagword flags); -Possible errors are: -@table @code -@item invalid_operation -If output has already started for this bfd. -@item no_memory -If obstack alloc fails. -@end table +DESCRIPTION + Set the attributes of the section @var{sec} to the value @var{flags}. + Return <> on success, <> on error. Possible error + returns are: + + o <> - + The section cannot have one or more of the attributes + requested. For example, a .bss section in <> may not + have the <> field set. -*; PROTO(asection *, bfd_make_section, (bfd *, CONST char *name)); */ +bfd_boolean +bfd_set_section_flags (asection *section, flagword flags) +{ + section->flags = flags; + return TRUE; +} + +/* +FUNCTION + bfd_rename_section +SYNOPSIS + void bfd_rename_section + (asection *sec, const char *newname); -sec_ptr -DEFUN(bfd_make_section,(abfd, name), - bfd *abfd AND - CONST char * name) +DESCRIPTION + Rename section @var{sec} to @var{newname}. +*/ + +void +bfd_rename_section (asection *sec, const char *newname) { - asection *newsect; - asection ** prev = &abfd->sections; - asection * sect = abfd->sections; - - if (abfd->output_has_begun) { - bfd_error = invalid_operation; - return NULL; - } + struct section_hash_entry *sh; - while (sect) { - if (!strcmp(sect->name, name)) return sect; - prev = §->next; - sect = sect->next; - } + sh = (struct section_hash_entry *) + ((char *) sec - offsetof (struct section_hash_entry, section)); + sh->section.name = newname; + bfd_hash_rename (&sec->owner->section_htab, newname, &sh->root); +} - newsect = (asection *) bfd_zalloc(abfd, sizeof (asection)); - if (newsect == NULL) { - bfd_error = no_memory; - return NULL; - } +/* +FUNCTION + bfd_map_over_sections - newsect->name = name; - newsect->index = abfd->section_count++; - newsect->flags = SEC_NO_FLAGS; - - newsect->userdata = 0; - newsect->next = (asection *)NULL; - newsect->relocation = (arelent *)NULL; - newsect->reloc_count = 0; - newsect->line_filepos =0; - newsect->owner = abfd; - if (BFD_SEND (abfd, _new_section_hook, (abfd, newsect)) != true) { - free (newsect); - return NULL; - } +SYNOPSIS + void bfd_map_over_sections + (bfd *abfd, + void (*func) (bfd *abfd, asection *sect, void *obj), + void *obj); - *prev = newsect; - return newsect; -} +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 preferred method for iterating over sections; an + alternative would be to use a loop: -/*proto* bfd_set_section_flags -Attempts to set the attributes of the section named in the bfd -supplied to the value. Returns true on success, false on error. -Possible error returns are: -@table @code -@item invalid operation -The section cannot have one or more of the attributes requested. For -example, a .bss section in @code{a.out} may not have the -@code{SEC_HAS_CONTENTS} field set. -@end table +| asection *p; +| for (p = abfd->sections; p != NULL; p = p->next) +| func (abfd, p, ...) -*; PROTO(boolean, bfd_set_section_flags, - (bfd *, asection *, flagword)); */ -boolean -DEFUN(bfd_set_section_flags,(abfd, section, flags), - bfd *abfd AND - sec_ptr section AND - flagword flags) +void +bfd_map_over_sections (bfd *abfd, + void (*operation) (bfd *, asection *, void *), + void *user_storage) { - if ((flags & bfd_applicable_section_flags (abfd)) != flags) { - bfd_error = invalid_operation; - return false; - } + asection *sect; + unsigned int i = 0; - section->flags = flags; - return true; -} + for (sect = abfd->sections; sect != NULL; i++, sect = sect->next) + (*operation) (abfd, sect, user_storage); + if (i != abfd->section_count) /* Debugging */ + abort (); +} -/*proto* bfd_map_over_sections -Calls the provided function @var{func} for each section attatched to -the bfd @var{abfd}, passing @var{obj} as an argument. The function -will be called as if by +/* +FUNCTION + bfd_sections_find_if -@example - func(abfd, the_section, obj); -@end example +SYNOPSIS + asection *bfd_sections_find_if + (bfd *abfd, + bfd_boolean (*operation) (bfd *abfd, asection *sect, void *obj), + void *obj); +DESCRIPTION + Call the provided function @var{operation} for each section + attached to the BFD @var{abfd}, passing @var{obj} as an + argument. The function will be called as if by -*; PROTO(void, bfd_map_over_sections, - (bfd *abfd, void (*func)(), PTR obj)); +| operation (abfd, the_section, obj); -This is the prefered method for iterating over sections, an -alternative would be to use a loop: + It returns the first section for which @var{operation} returns true. -@example - section *p; - for (p = abfd->sections; p != NULL; p = p->next) - func(abfd, p, ...) -@end example */ -/*VARARGS2*/ -void -DEFUN(bfd_map_over_sections,(abfd, operation, user_storage), - bfd *abfd AND - void (*operation)() AND - PTR user_storage) +asection * +bfd_sections_find_if (bfd *abfd, + bfd_boolean (*operation) (bfd *, asection *, void *), + void *user_storage) { asection *sect; - 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(); + for (sect = abfd->sections; sect != NULL; sect = sect->next) + if ((*operation) (abfd, sect, user_storage)) + break; + + return sect; } +/* +FUNCTION + bfd_set_section_size -/*proto* bfd_set_section_size -Sets @var{section} to the size @var{val}. If the operation is ok, then -@code{true} is returned, else @code{false}. +SYNOPSIS + bfd_boolean bfd_set_section_size (asection *sec, bfd_size_type val); -Possible error returns: -@table @code -@item invalid_operation -Writing has started to the bfd, so setting the size is invalid -@end table +DESCRIPTION + Set @var{sec} to the size @var{val}. If the operation is + ok, then <> is returned, else <>. + + Possible error returns: + o <> - + Writing has started to the BFD, so setting the size is invalid. -*; PROTO(boolean, bfd_set_section_size, - (bfd *, asection *, bfd_size_type val)); */ -boolean -DEFUN(bfd_set_section_size,(abfd, ptr, val), - bfd *abfd AND - sec_ptr ptr AND - unsigned long val) +bfd_boolean +bfd_set_section_size (asection *sec, bfd_size_type val) { /* Once you've started writing to any section you cannot create or change - the size of any others. */ + the size of any others. */ - if (abfd->output_has_begun) { - bfd_error = invalid_operation; - return false; - } + if (sec->owner == NULL || sec->owner->output_has_begun) + { + bfd_set_error (bfd_error_invalid_operation); + return FALSE; + } - ptr->size = val; - - return true; + sec->size = val; + return TRUE; } -/*proto* bfd_set_section_contents -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 @code{true} is returned, else @code{false}. Possible error -returns are: -@table @code -@item no_contents -The output section does not have the @code{SEC_HAS_CONTENTS} -attribute, so nothing can be written to it. -@item and some more too -@end table -This routine is front end to the back end function @code{_bfd_set_section_contents}. - -*; PROTO(boolean, bfd_set_section_contents, - (bfd *abfd, - asection *section, - PTR data, - file_ptr offset, - bfd_size_type count)); +/* +FUNCTION + bfd_set_section_contents + +SYNOPSIS + bfd_boolean bfd_set_section_contents + (bfd *abfd, asection *section, const void *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{location}. + The data is written to the output section starting at offset + @var{offset} for @var{count} octets. + + Normally <> is returned, but <> is returned if + there was an error. Possible error returns are: + o <> - + The output section does not have the <> + attribute, so nothing can be written to it. + o <> - + The section is unable to contain all of the data. + o <> - + The BFD is not writeable. + o and some more too. + + This routine is front end to the back end function + <<_bfd_set_section_contents>>. */ -boolean -DEFUN(bfd_set_section_contents,(abfd, section, location, offset, count), - bfd *abfd AND - sec_ptr section AND - PTR location AND - file_ptr offset AND - bfd_size_type count) +bfd_boolean +bfd_set_section_contents (bfd *abfd, + sec_ptr section, + const void *location, + file_ptr offset, + bfd_size_type count) { - if (!(bfd_get_section_flags(abfd, section) & SEC_HAS_CONTENTS)) - { - bfd_error = no_contents; - return(false); - } + bfd_size_type sz; + + if (!(bfd_section_flags (section) & SEC_HAS_CONTENTS)) + { + bfd_set_error (bfd_error_no_contents); + return FALSE; + } + + sz = section->size; + if ((bfd_size_type) offset > sz + || count > sz + || offset + count > sz + || count != (size_t) count) + { + bfd_set_error (bfd_error_bad_value); + return FALSE; + } + + if (!bfd_write_p (abfd)) + { + bfd_set_error (bfd_error_invalid_operation); + return FALSE; + } + + /* Record a copy of the data in memory if desired. */ + if (section->contents + && location != section->contents + offset) + memcpy (section->contents + offset, location, (size_t) count); if (BFD_SEND (abfd, _bfd_set_section_contents, - (abfd, section, location, offset, count))) - { - abfd->output_has_begun = true; - return true; - } + (abfd, section, location, offset, count))) + { + abfd->output_has_begun = TRUE; + return TRUE; + } + + return FALSE; +} + +/* +FUNCTION + bfd_get_section_contents + +SYNOPSIS + bfd_boolean bfd_get_section_contents + (bfd *abfd, asection *section, void *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 <> + flag set are requested or if the section does not have the + <> flag set, then the @var{location} is filled + with zeroes. If no errors occur, <> is returned, else + <>. + +*/ +bfd_boolean +bfd_get_section_contents (bfd *abfd, + sec_ptr section, + void *location, + file_ptr offset, + bfd_size_type count) +{ + bfd_size_type sz; + + if (section->flags & SEC_CONSTRUCTOR) + { + memset (location, 0, (size_t) count); + return TRUE; + } + + if (abfd->direction != write_direction && section->rawsize != 0) + sz = section->rawsize; + else + sz = section->size; + if ((bfd_size_type) offset > sz + || count > sz + || offset + count > sz + || count != (size_t) count) + { + bfd_set_error (bfd_error_bad_value); + return FALSE; + } + + if (count == 0) + /* Don't bother. */ + return TRUE; + + if ((section->flags & SEC_HAS_CONTENTS) == 0) + { + memset (location, 0, (size_t) count); + return TRUE; + } + + if ((section->flags & SEC_IN_MEMORY) != 0) + { + if (section->contents == NULL) + { + /* This can happen because of errors earlier on in the linking process. + We do not want to seg-fault here, so clear the flag and return an + error code. */ + section->flags &= ~ SEC_IN_MEMORY; + bfd_set_error (bfd_error_invalid_operation); + return FALSE; + } + + memmove (location, section->contents + offset, (size_t) count); + return TRUE; + } + + return BFD_SEND (abfd, _bfd_get_section_contents, + (abfd, section, location, offset, count)); +} + +/* +FUNCTION + bfd_malloc_and_get_section + +SYNOPSIS + bfd_boolean bfd_malloc_and_get_section + (bfd *abfd, asection *section, bfd_byte **buf); + +DESCRIPTION + Read all data from @var{section} in BFD @var{abfd} + into a buffer, *@var{buf}, malloc'd by this function. +*/ - return false; +bfd_boolean +bfd_malloc_and_get_section (bfd *abfd, sec_ptr sec, bfd_byte **buf) +{ + *buf = NULL; + return bfd_get_full_section_contents (abfd, sec, buf); } +/* +FUNCTION + bfd_copy_private_section_data + +SYNOPSIS + bfd_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 <> on success, <> on error. Possible error + returns are: + + o <> - + 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)) +*/ -/*proto* bfd_get_section_contents -This function reads 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. +/* +FUNCTION + bfd_generic_is_group_section -If the contents of a constuctor with the @code{SEC_CONSTUCTOR} flag -set are requested, then the @var{location} is filled with zeroes. +SYNOPSIS + bfd_boolean bfd_generic_is_group_section (bfd *, const asection *sec); -If no errors occur, @code{true} is returned, else @code{false}. -Possible errors are: +DESCRIPTION + Returns TRUE if @var{sec} is a member of a group. +*/ -@table @code -@item unknown yet -@end table +bfd_boolean +bfd_generic_is_group_section (bfd *abfd ATTRIBUTE_UNUSED, + const asection *sec ATTRIBUTE_UNUSED) +{ + return FALSE; +} -*; PROTO(boolean, bfd_get_section_contents, - (bfd *abfd, asection *section, PTR location, - file_ptr offset, bfd_size_type count)); +/* +FUNCTION + bfd_generic_group_name +SYNOPSIS + const char *bfd_generic_group_name (bfd *, const asection *sec); +DESCRIPTION + Returns group name if @var{sec} is a member of a group. */ -boolean -DEFUN(bfd_get_section_contents,(abfd, section, location, offset, count), - bfd *abfd AND - sec_ptr section AND - PTR location AND - file_ptr offset AND - bfd_size_type count) + +const char * +bfd_generic_group_name (bfd *abfd ATTRIBUTE_UNUSED, + const asection *sec ATTRIBUTE_UNUSED) { - if (section->flags & SEC_CONSTRUCTOR) - { - memset(location, 0, (unsigned)count); - return true; - } - else - { - return (BFD_SEND (abfd, _bfd_get_section_contents, - (abfd, section, location, offset, count))); - } + return NULL; } +/* +FUNCTION + bfd_generic_discard_group + +SYNOPSIS + bfd_boolean bfd_generic_discard_group (bfd *abfd, asection *group); + +DESCRIPTION + Remove all members of @var{group} from the output. +*/ + +bfd_boolean +bfd_generic_discard_group (bfd *abfd ATTRIBUTE_UNUSED, + asection *group ATTRIBUTE_UNUSED) +{ + return TRUE; +} + +bfd_boolean +_bfd_nowrite_set_section_contents (bfd *abfd, + sec_ptr section ATTRIBUTE_UNUSED, + const void *location ATTRIBUTE_UNUSED, + file_ptr offset ATTRIBUTE_UNUSED, + bfd_size_type count ATTRIBUTE_UNUSED) +{ + return _bfd_bool_bfd_false_error (abfd); +}