GDB 7.6.50

bfd/doc/section.texi

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-@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 @code{section.c}.
-
-@menu
-* Section Input::
-* Section Output::
-* typedef asection::
-* section prototypes::
-@end menu
-
-@node 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, @code{a.out} would contain at least
-three sections, called @code{.text}, @code{.data} and @code{.bss}.
-
-Names need not be unique; for example a COFF file may have several
-sections named @code{.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
-@code{bfd_make_section}) to the sections attached to an already open
-BFD. For example, the linker creates an extra section
-@code{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 @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 attached to the BFD in
-the same way as input sections; data is written to the
-sections using @code{bfd_set_section_contents}.
-
-Any program that creates or combines sections (e.g., the assembler
-and linker) must use the @code{asection} fields @code{output_section} and
-@code{output_offset} to indicate the file sections to which each
-section must be written.  (If the section is being created from
-scratch, @code{output_section} should probably point to the section
-itself and @code{output_offset} should probably be zero.)
-
-The data to be written comes from input sections attached
-(via @code{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 @code{asection}
-structures would look like:
-
-@example
-   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  --------|
-@end example
-
-@subsection Link orders
-The data within a section is stored in a @dfn{link_order}.
-These are much like the fixups in @code{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.
-
-
-@node typedef asection, section prototypes, Section Output, Sections
-@subsection typedef asection
-Here is the section structure:
-
-
-@example
-
-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.  */
-  int id;
-
-  /* Which section in the bfd; 0..n-1 as sections are created in a bfd.  */
-  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   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
-
-  /* A signal to the OS that the section contains read only data.  */
-#define SEC_READONLY   0x008
-
-  /* The section contains code only.  */
-#define SEC_CODE       0x010
-
-  /* The section contains data only.  */
-#define SEC_DATA       0x020
-
-  /* The section will reside in ROM.  */
-#define SEC_ROM        0x040
-
-  /* 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 (e.g., @code{__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 @code{__CTOR_LIST__} and relocate the data
-     contained within - exactly the operations it would peform on
-     standard data.  */
-#define SEC_CONSTRUCTOR 0x080
-
-  /* The section has contents - a data section could be
-     @code{SEC_ALLOC} | @code{SEC_HAS_CONTENTS}; a debug section could be
-     @code{SEC_HAS_CONTENTS}  */
-#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 has GOT references.  This flag is only for the
-     linker, and is currently only used by the elf32-hppa back end.
-     It will be set if global offset table references were detected
-     in this section, which indicate to the linker that the section
-     contains PIC code, and must be handled specially when doing a
-     static link.  */
-#define SEC_HAS_GOT_REF 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 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
-
-  /* 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
-
-  /* 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
-
-  /* Indicate that section has the no read flag set. This happens
-     when memory read flag isn't set. */
-#define SEC_COFF_NOREAD 0x40000000
-
-  /*  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
-
-  /* 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 @code{a.out}, where
-      the default address for @code{.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 @code{.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.  */
-  union @{
-    struct bfd_link_order *link_order;
-    struct bfd_section *s;
-  @} map_head, map_tail;
-@} 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;
-@};
-
-/* 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 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 (&std_section[0])
-/* Pointer to the undefined section.  */
-#define bfd_und_section_ptr (&std_section[1])
-/* Pointer to the absolute section.  */
-#define bfd_abs_section_ptr (&std_section[2])
-/* Pointer to the indirect section.  */
-#define bfd_ind_section_ptr (&std_section[3])
-
-#define bfd_is_und_section(sec) ((sec) == bfd_und_section_ptr)
-#define bfd_is_abs_section(sec) ((sec) == bfd_abs_section_ptr)
-#define bfd_is_ind_section(sec) ((sec) == bfd_ind_section_ptr)
-
-#define bfd_is_const_section(SEC)              \
- (   ((SEC) == bfd_abs_section_ptr)            \
-  || ((SEC) == bfd_und_section_ptr)            \
-  || ((SEC) == bfd_com_section_ptr)            \
-  || ((SEC) == bfd_ind_section_ptr))
-
-/* Macros to handle insertion and deletion of a bfd's sections.  These
-   only handle the list pointers, ie. do not adjust section_count,
-   target_index etc.  */
-#define bfd_section_list_remove(ABFD, S) \
-  do                                                   \
-    @{                                                  \
-      asection *_s = S;                                \
-      asection *_next = _s->next;                      \
-      asection *_prev = _s->prev;                      \
-      if (_prev)                                       \
-        _prev->next = _next;                           \
-      else                                             \
-        (ABFD)->sections = _next;                      \
-      if (_next)                                       \
-        _next->prev = _prev;                           \
-      else                                             \
-        (ABFD)->section_last = _prev;                  \
-    @}                                                  \
-  while (0)
-#define bfd_section_list_append(ABFD, S) \
-  do                                                   \
-    @{                                                  \
-      asection *_s = S;                                \
-      bfd *_abfd = ABFD;                               \
-      _s->next = NULL;                                 \
-      if (_abfd->section_last)                         \
-        @{                                              \
-          _s->prev = _abfd->section_last;              \
-          _abfd->section_last->next = _s;              \
-        @}                                              \
-      else                                             \
-        @{                                              \
-          _s->prev = NULL;                             \
-          _abfd->sections = _s;                        \
-        @}                                              \
-      _abfd->section_last = _s;                        \
-    @}                                                  \
-  while (0)
-#define bfd_section_list_prepend(ABFD, S) \
-  do                                                   \
-    @{                                                  \
-      asection *_s = S;                                \
-      bfd *_abfd = ABFD;                               \
-      _s->prev = NULL;                                 \
-      if (_abfd->sections)                             \
-        @{                                              \
-          _s->next = _abfd->sections;                  \
-          _abfd->sections->prev = _s;                  \
-        @}                                              \
-      else                                             \
-        @{                                              \
-          _s->next = NULL;                             \
-          _abfd->section_last = _s;                    \
-        @}                                              \
-      _abfd->sections = _s;                            \
-    @}                                                  \
-  while (0)
-#define bfd_section_list_insert_after(ABFD, A, S) \
-  do                                                   \
-    @{                                                  \
-      asection *_a = A;                                \
-      asection *_s = S;                                \
-      asection *_next = _a->next;                      \
-      _s->next = _next;                                \
-      _s->prev = _a;                                   \
-      _a->next = _s;                                   \
-      if (_next)                                       \
-        _next->prev = _s;                              \
-      else                                             \
-        (ABFD)->section_last = _s;                     \
-    @}                                                  \
-  while (0)
-#define bfd_section_list_insert_before(ABFD, B, S) \
-  do                                                   \
-    @{                                                  \
-      asection *_b = B;                                \
-      asection *_s = S;                                \
-      asection *_prev = _b->prev;                      \
-      _s->prev = _prev;                                \
-      _s->next = _b;                                   \
-      _b->prev = _s;                                   \
-      if (_prev)                                       \
-        _prev->next = _s;                              \
-      else                                             \
-        (ABFD)->sections = _s;                         \
-    @}                                                  \
-  while (0)
-#define bfd_section_removed_from_list(ABFD, S) \
-  ((S)->next == NULL ? (ABFD)->section_last != (S) : (S)->next->prev != (S))
-
-#define BFD_FAKE_SECTION(SEC, FLAGS, SYM, NAME, IDX)                   \
-  /* name, id,  index, next, prev, flags, user_set_vma,            */  \
-  @{ NAME,  IDX, 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                                            */  \
-     @{ NULL @}, @{ NULL @}                                                \
-    @}
-
-@end example
-
-@node section prototypes,  , typedef asection, Sections
-@subsection Section prototypes
-These are the functions exported by the section handling part of BFD.
-
-@findex bfd_section_list_clear
-@subsubsection @code{bfd_section_list_clear}
-@strong{Synopsis}
-@example
-void bfd_section_list_clear (bfd *);
-@end example
-@strong{Description}@*
-Clears the section list, and also resets the section count and
-hash table entries.
-
-@findex bfd_get_section_by_name
-@subsubsection @code{bfd_get_section_by_name}
-@strong{Synopsis}
-@example
-asection *bfd_get_section_by_name (bfd *abfd, const char *name);
-@end example
-@strong{Description}@*
-Return the most recently created section attached to @var{abfd}
-named @var{name}.  Return NULL if no such section exists.
-
-@findex bfd_get_next_section_by_name
-@subsubsection @code{bfd_get_next_section_by_name}
-@strong{Synopsis}
-@example
-asection *bfd_get_next_section_by_name (asection *sec);
-@end example
-@strong{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.  Return NULL if no such section exists.
-
-@findex bfd_get_linker_section
-@subsubsection @code{bfd_get_linker_section}
-@strong{Synopsis}
-@example
-asection *bfd_get_linker_section (bfd *abfd, const char *name);
-@end example
-@strong{Description}@*
-Return the linker created section attached to @var{abfd}
-named @var{name}.  Return NULL if no such section exists.
-
-@findex bfd_get_section_by_name_if
-@subsubsection @code{bfd_get_section_by_name_if}
-@strong{Synopsis}
-@example
-asection *bfd_get_section_by_name_if
-   (bfd *abfd,
-    const char *name,
-    bfd_boolean (*func) (bfd *abfd, asection *sect, void *obj),
-    void *obj);
-@end example
-@strong{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
-
-@example
-       func (abfd, the_section, obj);
-@end example
-
-It returns the first section for which @var{func} returns true,
-otherwise @code{NULL}.
-
-@findex bfd_get_unique_section_name
-@subsubsection @code{bfd_get_unique_section_name}
-@strong{Synopsis}
-@example
-char *bfd_get_unique_section_name
-   (bfd *abfd, const char *templat, int *count);
-@end example
-@strong{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.
-
-@findex bfd_make_section_old_way
-@subsubsection @code{bfd_make_section_old_way}
-@strong{Synopsis}
-@example
-asection *bfd_make_section_old_way (bfd *abfd, const char *name);
-@end example
-@strong{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:
-@itemize @bullet
-
-@item
-@code{bfd_error_invalid_operation} -
-If output has already started for this BFD.
-@item
-@code{bfd_error_no_memory} -
-If memory allocation fails.
-@end itemize
-
-@findex bfd_make_section_anyway_with_flags
-@subsubsection @code{bfd_make_section_anyway_with_flags}
-@strong{Synopsis}
-@example
-asection *bfd_make_section_anyway_with_flags
-   (bfd *abfd, const char *name, flagword flags);
-@end example
-@strong{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}.
-
-Return @code{NULL} and set @code{bfd_error} on error; possible errors are:
-@itemize @bullet
-
-@item
-@code{bfd_error_invalid_operation} - If output has already started for @var{abfd}.
-@item
-@code{bfd_error_no_memory} - If memory allocation fails.
-@end itemize
-
-@findex bfd_make_section_anyway
-@subsubsection @code{bfd_make_section_anyway}
-@strong{Synopsis}
-@example
-asection *bfd_make_section_anyway (bfd *abfd, const char *name);
-@end example
-@strong{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 @code{NULL} and set @code{bfd_error} on error; possible errors are:
-@itemize @bullet
-
-@item
-@code{bfd_error_invalid_operation} - If output has already started for @var{abfd}.
-@item
-@code{bfd_error_no_memory} - If memory allocation fails.
-@end itemize
-
-@findex bfd_make_section_with_flags
-@subsubsection @code{bfd_make_section_with_flags}
-@strong{Synopsis}
-@example
-asection *bfd_make_section_with_flags
-   (bfd *, const char *name, flagword flags);
-@end example
-@strong{Description}@*
-Like @code{bfd_make_section_anyway}, but return @code{NULL} (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 @code{NULL} and set
-@code{bfd_error}.
-
-@findex bfd_make_section
-@subsubsection @code{bfd_make_section}
-@strong{Synopsis}
-@example
-asection *bfd_make_section (bfd *, const char *name);
-@end example
-@strong{Description}@*
-Like @code{bfd_make_section_anyway}, but return @code{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 @code{NULL} and set
-@code{bfd_error}.
-
-@findex bfd_set_section_flags
-@subsubsection @code{bfd_set_section_flags}
-@strong{Synopsis}
-@example
-bfd_boolean bfd_set_section_flags
-   (bfd *abfd, asection *sec, flagword flags);
-@end example
-@strong{Description}@*
-Set the attributes of the section @var{sec} in the BFD
-@var{abfd} to the value @var{flags}. Return @code{TRUE} on success,
-@code{FALSE} on error. Possible error returns are:
-
-@itemize @bullet
-
-@item
-@code{bfd_error_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 itemize
-
-@findex bfd_rename_section
-@subsubsection @code{bfd_rename_section}
-@strong{Synopsis}
-@example
-void bfd_rename_section
-   (bfd *abfd, asection *sec, const char *newname);
-@end example
-@strong{Description}@*
-Rename section @var{sec} in @var{abfd} to @var{newname}.
-
-@findex bfd_map_over_sections
-@subsubsection @code{bfd_map_over_sections}
-@strong{Synopsis}
-@example
-void bfd_map_over_sections
-   (bfd *abfd,
-    void (*func) (bfd *abfd, asection *sect, void *obj),
-    void *obj);
-@end example
-@strong{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
-
-@example
-       func (abfd, the_section, obj);
-@end example
-
-This is the preferred method for iterating over sections; an
-alternative would be to use a loop:
-
-@example
-          section *p;
-          for (p = abfd->sections; p != NULL; p = p->next)
-             func (abfd, p, ...)
-@end example
-
-@findex bfd_sections_find_if
-@subsubsection @code{bfd_sections_find_if}
-@strong{Synopsis}
-@example
-asection *bfd_sections_find_if
-   (bfd *abfd,
-    bfd_boolean (*operation) (bfd *abfd, asection *sect, void *obj),
-    void *obj);
-@end example
-@strong{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
-
-@example
-       operation (abfd, the_section, obj);
-@end example
-
-It returns the first section for which @var{operation} returns true.
-
-@findex bfd_set_section_size
-@subsubsection @code{bfd_set_section_size}
-@strong{Synopsis}
-@example
-bfd_boolean bfd_set_section_size
-   (bfd *abfd, asection *sec, bfd_size_type val);
-@end example
-@strong{Description}@*
-Set @var{sec} to the size @var{val}. If the operation is
-ok, then @code{TRUE} is returned, else @code{FALSE}.
-
-Possible error returns:
-@itemize @bullet
-
-@item
-@code{bfd_error_invalid_operation} -
-Writing has started to the BFD, so setting the size is invalid.
-@end itemize
-
-@findex bfd_set_section_contents
-@subsubsection @code{bfd_set_section_contents}
-@strong{Synopsis}
-@example
-bfd_boolean bfd_set_section_contents
-   (bfd *abfd, asection *section, const void *data,
-    file_ptr offset, bfd_size_type count);
-@end example
-@strong{Description}@*
-Sets the contents of the section @var{section} in BFD
-@var{abfd} to the data starting in memory at @var{data}. The
-data is written to the output section starting at offset
-@var{offset} for @var{count} octets.
-
-Normally @code{TRUE} is returned, else @code{FALSE}. Possible error
-returns are:
-@itemize @bullet
-
-@item
-@code{bfd_error_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 itemize
-This routine is front end to the back end function
-@code{_bfd_set_section_contents}.
-
-@findex bfd_get_section_contents
-@subsubsection @code{bfd_get_section_contents}
-@strong{Synopsis}
-@example
-bfd_boolean bfd_get_section_contents
-   (bfd *abfd, asection *section, void *location, file_ptr offset,
-    bfd_size_type count);
-@end example
-@strong{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 @code{SEC_CONSTRUCTOR}
-flag set are requested or if the section does not have the
-@code{SEC_HAS_CONTENTS} flag set, then the @var{location} is filled
-with zeroes. If no errors occur, @code{TRUE} is returned, else
-@code{FALSE}.
-
-@findex bfd_malloc_and_get_section
-@subsubsection @code{bfd_malloc_and_get_section}
-@strong{Synopsis}
-@example
-bfd_boolean bfd_malloc_and_get_section
-   (bfd *abfd, asection *section, bfd_byte **buf);
-@end example
-@strong{Description}@*
-Read all data from @var{section} in BFD @var{abfd}
-into a buffer, *@var{buf}, malloc'd by this function.
-
-@findex bfd_copy_private_section_data
-@subsubsection @code{bfd_copy_private_section_data}
-@strong{Synopsis}
-@example
-bfd_boolean bfd_copy_private_section_data
-   (bfd *ibfd, asection *isec, bfd *obfd, asection *osec);
-@end example
-@strong{Description}@*
-Copy private section information from @var{isec} in the BFD
-@var{ibfd} to the section @var{osec} in the BFD @var{obfd}.
-Return @code{TRUE} on success, @code{FALSE} on error.  Possible error
-returns are:
-
-@itemize @bullet
-
-@item
-@code{bfd_error_no_memory} -
-Not enough memory exists to create private data for @var{osec}.
-@end itemize
-@example
-#define bfd_copy_private_section_data(ibfd, isection, obfd, osection) \
-     BFD_SEND (obfd, _bfd_copy_private_section_data, \
-               (ibfd, isection, obfd, osection))
-@end example
-
-@findex bfd_generic_is_group_section
-@subsubsection @code{bfd_generic_is_group_section}
-@strong{Synopsis}
-@example
-bfd_boolean bfd_generic_is_group_section (bfd *, const asection *sec);
-@end example
-@strong{Description}@*
-Returns TRUE if @var{sec} is a member of a group.
-
-@findex bfd_generic_discard_group
-@subsubsection @code{bfd_generic_discard_group}
-@strong{Synopsis}
-@example
-bfd_boolean bfd_generic_discard_group (bfd *abfd, asection *group);
-@end example
-@strong{Description}@*
-Remove all members of @var{group} from the output.
-