/* Object file "section" support for the BFD library.
- Copyright (C) 1990-1991 Free Software Foundation, Inc.
+ Copyright (C) 1990, 91, 92, 93, 94, 95, 1996 Free Software Foundation, Inc.
Written by Cygnus Support.
This file is part of BFD, the Binary File Descriptor library.
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/*
SECTION
Sections
- Sections are supported in BFD in <<section.c>>.
-
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,
+ sections. It keeps hold of them by pointing to the first;
each one points to the next in the list.
+ Sections are supported in BFD in <<section.c>>.
+
@menu
@* Section Input::
@* Section Output::
@* section prototypes::
@end menu
-@node Section Input, Section Output, Sections, Sections
+INODE
+Section Input, Section Output, Sections, Sections
SUBSECTION
- Section Input
+ Section input
When a BFD is opened for reading, the section structures are
created and attached to the BFD.
Each section has a name which describes the section in the
- outside world
- for example, <<a.out>> would contain at least
- three sections, called <<.text>>, <<.data>> and <<.bss>>.
+ outside world
---for example, <<a.out>> would contain at least
+ three sections, called <<.text>>, <<.data>> and <<.bss>>.
- Sometimes a BFD will contain more than the 'natural' number of
+ Names need not be unique; for example a COFF file may have several
+ sections named <<.data>>.
+
+ Sometimes a BFD will contain more than the ``natural'' number of
sections. A back end may attach other sections containing
constructor data, or an application may add a section (using
- bfd_make_section) to the sections attached to an already open
- BFD. For example, the linker creates a supernumary section
+ <<bfd_make_section>>) to the sections attached to an already open
+ BFD. For example, the linker creates an extra section
<<COMMON>> for each input file's BFD to hold information about
common storage.
- The raw data is not necessarily read in at the same time as
+ The raw data is not necessarily read in when
the section descriptor is created. Some targets may leave the
data in place until a <<bfd_get_section_contents>> call is
- made. Other back ends may read in all the data at once - For
- example; an S-record file has to be read once to determine the
+ 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
+INODE
+Section Output, typedef asection, Section Input, Sections
SUBSECTION
- Section Output
+ Section output
To write a new object style BFD, the various sections to be
written have to be created. They are attached to the BFD in
- the same way as input sections, data is written to the
- sections using <<bfd_set_section_contents>>.
-
- The linker uses the fields <<output_section>> and
- <<output_offset>> to create an output file.
-
- The data to be written comes from input sections attached to
+ the same way as input sections; data is written to the
+ sections using <<bfd_set_section_contents>>.
+
+ Any program that creates or combines sections (e.g., the assembler
+ and linker) must use the <<asection>> fields <<output_section>> and
+ <<output_offset>> to indicate the file sections to which each
+ section must be written. (If the section is being created from
+ scratch, <<output_section>> should probably point to the section
+ itself and <<output_offset>> should probably be zero.)
+
+ The data to be written comes from input sections attached
+ (via <<output_section>> pointers) to
the output sections. The output section structure can be
- considered a filter for the input section, the output section
+ 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:
+ E.g., to create a section "O", starting at 0x100, 0x123 long,
+ containing two subsections, "A" at offset 0x0 (i.e., at vma
+ 0x100) and "B" at offset 0x20 (i.e., at vma 0x120) the <<asection>>
+ structures would look like:
| section name "A"
| output_offset 0x00
SUBSECTION
- Seglets
+ Link orders
- The data within a section is stored in a <<seglet>>. These
- are much like the fixups in <<gas>>. The seglet abstraction
- allows the a section to grow and shrink within itself.
+ The data within a section is stored in a @dfn{link_order}.
+ These are much like the fixups in <<gas>>. The link_order
+ abstraction allows a section to grow and shrink within itself.
- A seglet knows how big it is, and which is the next seglet and
- where the raw data for it is, and also points to a list of
- relocations which apply to it.
+ 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 seglet is used by the linker to perform relaxing on final
- code. The application creates code which is as big as
+ 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 seglet by seglet basis.
+ a link_order by link_order basis.
*/
#include "libbfd.h"
-/*doc*
-@node typedef asection, section prototypes, Section Output, Sections
+/*
+DOCDD
+INODE
+typedef asection, section prototypes, Section Output, Sections
SUBSECTION
typedef asection
- The shape of a section struct:
+ Here is the section structure:
CODE_FRAGMENT
.
-.typedef struct sec
+.typedef struct sec
.{
-. {* The name of the section, the name isn't a copy, the pointer is
+. {* The name of the section; the name isn't a copy, the pointer is
. the same as that passed to bfd_make_section. *}
.
. CONST char *name;
.
+. {* Which section is it; 0..nth. *}
.
-. {* Which section is it 0.nth *}
-.
-. int index;
+. int index;
.
. {* The next section in the list belonging to the BFD, or NULL. *}
.
. struct sec *next;
.
-. {* The field flags contains attributes of the section. Some of
+. {* The field flags contains attributes of the section. Some
. flags are read in from the object file, and some are
-. synthesized from other information. *}
+. synthesized from other information. *}
.
. flagword flags;
.
.#define SEC_NO_FLAGS 0x000
.
-. {* Tells the OS to allocate space for this section when loaded.
-. This would clear for a section containing debug information
+. {* 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 would be clear for a .bss section *}
.
+. {* 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 will
-. be some relocation information too. *}
.
+. {* The section contains data still to be relocated, so there is
+. some relocation information too. *}
.#define SEC_RELOC 0x004
.
-. {* Obsolete ? *}
-.
+.#if 0 {* Obsolete ? *}
.#define SEC_BALIGN 0x008
+.#endif
.
. {* A signal to the OS that the section contains read only
. data. *}
.#define SEC_READONLY 0x010
.
. {* The section contains code only. *}
-.
.#define SEC_CODE 0x020
.
. {* The section contains data only. *}
-.
-.#define SEC_DATA 0x040
+.#define SEC_DATA 0x040
.
. {* The section will reside in ROM. *}
-.
.#define SEC_ROM 0x080
.
. {* The section contains constructor information. This section
. type is used by the linker to create lists of constructors and
. destructors used by <<g++>>. When a back end sees a symbol
. which should be used in a constructor list, it creates a new
-. section for the type of name (eg <<__CTOR_LIST__>>), attaches
-. 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 <<__CTOR_LIST__>> and relocte the data
+. section for the type of name (e.g., <<__CTOR_LIST__>>), attaches
+. the symbol to it, and builds a relocation. To build the lists
+. of constructors, all the linker has to do is catenate all the
+. sections called <<__CTOR_LIST__>> and relocate the data
. contained within - exactly the operations it would peform on
. standard data. *}
-.
.#define SEC_CONSTRUCTOR 0x100
.
. {* The section is a constuctor, and should be placed at the
-. end of the . *}
-.
-.
+. end of the text, data, or bss section(?). *}
.#define SEC_CONSTRUCTOR_TEXT 0x1100
-.
.#define SEC_CONSTRUCTOR_DATA 0x2100
-.
.#define SEC_CONSTRUCTOR_BSS 0x3100
.
-.
-. {* The section has contents - a bss section could be
-. <<SEC_ALLOC>> | <<SEC_HAS_CONTENTS>>, a debug section could be
+. {* The section has contents - a data section could be
+. <<SEC_ALLOC>> | <<SEC_HAS_CONTENTS>>; a debug section could be
. <<SEC_HAS_CONTENTS>> *}
-.
.#define SEC_HAS_CONTENTS 0x200
.
-. {* An instruction to the linker not to output sections
-. containing this flag even if they have information which
-. would normally be written. *}
-.
+. {* An instruction to the linker to not output the section
+. even if it has information which would normally be written. *}
.#define SEC_NEVER_LOAD 0x400
.
+. {* The section is a COFF shared library section. This flag is
+. only for the linker. If this type of section appears in
+. the input file, the linker must copy it to the output file
+. without changing the vma or size. FIXME: Although this
+. was originally intended to be general, it really is COFF
+. specific (and the flag was renamed to indicate this). It
+. might be cleaner to have some more general mechanism to
+. allow the back end to control what the linker does with
+. sections. *}
+.#define SEC_COFF_SHARED_LIBRARY 0x800
+.
+. {* The section contains common symbols (symbols may be defined
+. multiple times, the value of a symbol is the amount of
+. space it requires, and the largest symbol value is the one
+. used). Most targets have exactly one of these (which we
+. translate to bfd_com_section_ptr), but ECOFF has two. *}
+.#define SEC_IS_COMMON 0x8000
+.
+. {* The section contains only debugging information. For
+. example, this is set for ELF .debug and .stab sections.
+. strip tests this flag to see if a section can be
+. discarded. *}
+.#define SEC_DEBUGGING 0x10000
+.
+. {* The contents of this section are held in memory pointed to
+. by the contents field. This is checked by
+. bfd_get_section_contents, and the data is retrieved from
+. memory if appropriate. *}
+.#define SEC_IN_MEMORY 0x20000
+.
+. {* The contents of this section are to be excluded by the
+. linker for executable and shared objects unless those
+. objects are to be further relocated. *}
+.#define SEC_EXCLUDE 0x40000
+.
+. {* The contents of this section are to be sorted by the
+. based on the address specified in the associated symbol
+. table. *}
+.#define SEC_SORT_ENTRIES 0x80000
+.
+. {* When linking, duplicate sections of the same name should be
+. discarded, rather than being combined into a single section as
+. is usually done. This is similar to how common symbols are
+. handled. See SEC_LINK_DUPLICATES below. *}
+.#define SEC_LINK_ONCE 0x100000
+.
+. {* If SEC_LINK_ONCE is set, this bitfield describes how the linker
+. should handle duplicate sections. *}
+.#define SEC_LINK_DUPLICATES 0x600000
+.
+. {* This value for SEC_LINK_DUPLICATES means that duplicate
+. sections with the same name should simply be discarded. *}
+.#define SEC_LINK_DUPLICATES_DISCARD 0x0
+.
+. {* This value for SEC_LINK_DUPLICATES means that the linker
+. should warn if there are any duplicate sections, although
+. it should still only link one copy. *}
+.#define SEC_LINK_DUPLICATES_ONE_ONLY 0x200000
+.
+. {* This value for SEC_LINK_DUPLICATES means that the linker
+. should warn if any duplicate sections are a different size. *}
+.#define SEC_LINK_DUPLICATES_SAME_SIZE 0x400000
+.
+. {* This value for SEC_LINK_DUPLICATES means that the linker
+. should warn if any duplicate sections contain different
+. contents. *}
+.#define SEC_LINK_DUPLICATES_SAME_CONTENTS 0x600000
+.
+. {* This section was created by the linker as part of dynamic
+. relocation or other arcane processing. It is skipped when
+. going through the first-pass output, trusting that someone
+. else up the line will take care of it later. *}
+.#define SEC_LINKER_CREATED 0x800000
+.
+. {* End of section flags. *}
+.
+. {* Some internal packed boolean fields. *}
+.
+. {* See the vma field. *}
+. unsigned int user_set_vma : 1;
+.
+. {* Whether relocations have been processed. *}
+. unsigned int reloc_done : 1;
+.
+. {* A mark flag used by some of the linker backends. *}
+. unsigned int linker_mark : 1;
+.
+. {* End of internal packed boolean fields. *}
+.
+. {* The virtual memory address of the section - where it will be
+. at run time. The symbols are relocated against this. The
+. user_set_vma flag is maintained by bfd; if it's not set, the
+. backend can assign addresses (for example, in <<a.out>>, where
+. the default address for <<.data>> is dependent on the specific
+. target and various flags). *}
.
-.
. bfd_vma vma;
.
+. {* The load address of the section - where it would be in a
+. rom image; really only used for writing section header
+. information. *}
+.
+. bfd_vma lma;
+.
. {* The size of the section in bytes, as it will be output.
-. contains a value even if the section has no contents (eg, the
+. contains a value even if the section has no contents (e.g., the
. size of <<.bss>>). This will be filled in after relocation *}
.
-. bfd_size_type _cooked_size;
+. bfd_size_type _cooked_size;
.
-. {* The size on disk of the section in bytes originally. Normally this
+. {* The original size on disk of the section, in bytes. Normally this
. value is the same as the size, but if some relaxing has
. been done, then this value will be bigger. *}
.
-. bfd_size_type _raw_size;
+. bfd_size_type _raw_size;
.
. {* If this section is going to be output, then this value is the
. offset into the output section of the first byte in the input
-. section. Eg, if this was going to start at the 100th byte in
+. section. E.g., if this was going to start at the 100th byte in
. the output section, this value would be 100. *}
.
. bfd_vma output_offset;
.
. struct sec *output_section;
.
-. {* The alignment requirement of the section, as an exponent - eg
-. 3 aligns to 2^3 (or 8) *}
+. {* The alignment requirement of the section, as an exponent of 2 -
+. e.g., 3 aligns to 2^3 (or 8). *}
.
. unsigned int alignment_power;
.
. unsigned reloc_count;
.
. {* Information below is back end specific - and not always used
-. or updated
+. or updated. *}
+.
+. {* File position of section data *}
.
-. File position of section data *}
+. file_ptr filepos;
.
-. file_ptr filepos;
-.
. {* File position of relocation info *}
.
. file_ptr rel_filepos;
.
. PTR userdata;
.
-. struct lang_output_section *otheruserdata;
+. {* 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;
.
. file_ptr moving_line_filepos;
.
-. {* what the section number is in the target world *}
+. {* What the section number is in the target world *}
.
. int target_index;
.
.
. bfd *owner;
.
-. boolean reloc_done;
. {* A symbol which points at this section only *}
-. struct symbol_cache_entry *symbol;
+. struct symbol_cache_entry *symbol;
. struct symbol_cache_entry **symbol_ptr_ptr;
-. struct bfd_seclet_struct *seclets_head;
-. struct bfd_seclet_struct *seclets_tail;
-.} asection ;
.
+. struct bfd_link_order *link_order_head;
+. struct bfd_link_order *link_order_tail;
+.} asection ;
.
+. {* These sections are global, and are managed by BFD. The application
+. and target back end are not permitted to change the values in
+. these sections. New code should use the section_ptr macros rather
+. than referring directly to the const sections. The const sections
+. may eventually vanish. *}
.#define BFD_ABS_SECTION_NAME "*ABS*"
.#define BFD_UND_SECTION_NAME "*UND*"
.#define BFD_COM_SECTION_NAME "*COM*"
+.#define BFD_IND_SECTION_NAME "*IND*"
.
. {* the absolute section *}
-. extern asection bfd_abs_section;
+.extern const asection bfd_abs_section;
+.#define bfd_abs_section_ptr ((asection *) &bfd_abs_section)
+.#define bfd_is_abs_section(sec) ((sec) == bfd_abs_section_ptr)
. {* Pointer to the undefined section *}
-. extern asection bfd_und_section;
+.extern const asection bfd_und_section;
+.#define bfd_und_section_ptr ((asection *) &bfd_und_section)
+.#define bfd_is_und_section(sec) ((sec) == bfd_und_section_ptr)
. {* Pointer to the common section *}
-. extern asection bfd_com_section;
-.
-. extern struct symbol_cache_entry *bfd_abs_symbol;
-. extern struct symbol_cache_entry *bfd_com_symbol;
-. extern struct symbol_cache_entry *bfd_und_symbol;
+.extern const asection bfd_com_section;
+.#define bfd_com_section_ptr ((asection *) &bfd_com_section)
+. {* Pointer to the indirect section *}
+.extern const asection bfd_ind_section;
+.#define bfd_ind_section_ptr ((asection *) &bfd_ind_section)
+.#define bfd_is_ind_section(sec) ((sec) == bfd_ind_section_ptr)
+.
+.extern const struct symbol_cache_entry * const bfd_abs_symbol;
+.extern const struct symbol_cache_entry * const bfd_com_symbol;
+.extern const struct symbol_cache_entry * const bfd_und_symbol;
+.extern const struct symbol_cache_entry * const bfd_ind_symbol;
.#define bfd_get_section_size_before_reloc(section) \
. (section->reloc_done ? (abort(),1): (section)->_raw_size)
.#define bfd_get_section_size_after_reloc(section) \
. ((section->reloc_done) ? (section)->_cooked_size: (abort(),1))
*/
-
-
-asection bfd_com_section = { BFD_COM_SECTION_NAME ,0 };
-asection bfd_und_section = { BFD_UND_SECTION_NAME ,0 };
-asection bfd_abs_section = { BFD_ABS_SECTION_NAME ,0 };
-
-struct symbol_cache_entry *bfd_abs_symbol;
-struct symbol_cache_entry *bfd_com_symbol;
-struct symbol_cache_entry *bfd_und_symbol;
+/* These symbols are global, not specific to any BFD. Therefore, anything
+ that tries to change them is broken, and should be repaired. */
+static const asymbol global_syms[] =
+{
+ /* the_bfd, name, value, attr, section [, udata] */
+ {0, BFD_COM_SECTION_NAME, 0, BSF_SECTION_SYM, (asection *) &bfd_com_section},
+ {0, BFD_UND_SECTION_NAME, 0, BSF_SECTION_SYM, (asection *) &bfd_und_section},
+ {0, BFD_ABS_SECTION_NAME, 0, BSF_SECTION_SYM, (asection *) &bfd_abs_section},
+ {0, BFD_IND_SECTION_NAME, 0, BSF_SECTION_SYM, (asection *) &bfd_ind_section},
+};
+
+#define STD_SECTION(SEC, FLAGS, SYM, NAME, IDX) \
+ const asymbol * const SYM = (asymbol *) &global_syms[IDX]; \
+ const asection SEC = \
+ { NAME, 0, 0, FLAGS, 0, 0, 0, 0, 0, 0, 0, 0, (asection *) &SEC, \
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
+ (asymbol *) &global_syms[IDX], (asymbol **) &SYM, 0, 0 }
+
+STD_SECTION (bfd_com_section, SEC_IS_COMMON, bfd_com_symbol,
+ BFD_COM_SECTION_NAME, 0);
+STD_SECTION (bfd_und_section, 0, bfd_und_symbol, BFD_UND_SECTION_NAME, 1);
+STD_SECTION (bfd_abs_section, 0, bfd_abs_symbol, BFD_ABS_SECTION_NAME, 2);
+STD_SECTION (bfd_ind_section, 0, bfd_ind_symbol, BFD_IND_SECTION_NAME, 3);
+#undef STD_SECTION
/*
-@node section prototypes, , typedef asection, Sections
+DOCDD
+INODE
+section prototypes, , typedef asection, Sections
SUBSECTION
- section prototypes
+ Section prototypes
-These are the functions exported by the section handling part of
-<<libbfd>.
+These are the functions exported by the section handling part of BFD.
*/
/*
-FUNCTION
+FUNCTION
bfd_get_section_by_name
SYNOPSIS
asection *bfd_get_section_by_name(bfd *abfd, CONST char *name);
DESCRIPTION
- Runs through the provided @var{abfd} and returns the
- <<asection>> who's name matches that provided, otherwise NULL.
+ Run through @var{abfd} and return the one of the
+ <<asection>>s whose name matches @var{name}, otherwise <<NULL>>.
@xref{Sections}, for more information.
+ This should only be used in special cases; the normal way to process
+ all sections of a given name is to use <<bfd_map_over_sections>> and
+ <<strcmp>> on the name (or better yet, base it on the section flags
+ or something else) for each section.
*/
asection *
-DEFUN(bfd_get_section_by_name,(abfd, name),
- bfd *abfd AND
- CONST char *name)
+bfd_get_section_by_name (abfd, name)
+ bfd *abfd;
+ CONST char *name;
{
asection *sect;
for (sect = abfd->sections; sect != NULL; sect = sect->next)
- if (!strcmp (sect->name, name)) return sect;
+ if (!strcmp (sect->name, name))
+ return sect;
return NULL;
}
bfd_make_section_old_way
SYNOPSIS
- asection *bfd_make_section_old_way(bfd *, CONST char *name);
+ asection *bfd_make_section_old_way(bfd *abfd, CONST char *name);
DESCRIPTION
- This function creates a new empty section called @var{name}
- and attaches it to the end of the chain of sections for the
- BFD supplied. An attempt to create a section with a name which
- is already in use, returns its pointer without changing the
+ 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 is was rewritten...
+ before it was rewritten....
Possible errors are:
- o invalid_operation
+ o <<bfd_error_invalid_operation>> -
If output has already started for this BFD.
- o no_memory
+ o <<bfd_error_no_memory>> -
If obstack alloc fails.
*/
asection *
-DEFUN(bfd_make_section_old_way,(abfd, name),
- bfd *abfd AND
- CONST char * name)
+bfd_make_section_old_way (abfd, name)
+ bfd *abfd;
+ CONST char *name;
{
- asection *sec = bfd_get_section_by_name(abfd, name);
- if (sec == (asection *)NULL)
+ asection *sec = bfd_get_section_by_name (abfd, name);
+ if (sec == (asection *) NULL)
{
- sec = bfd_make_section(abfd, name);
+ sec = bfd_make_section (abfd, name);
}
return sec;
}
-
/*
FUNCTION
- bfd_make_section
+ bfd_make_section_anyway
SYNOPSIS
- asection * bfd_make_section(bfd *, CONST char *name);
+ asection *bfd_make_section_anyway(bfd *abfd, CONST char *name);
DESCRIPTION
- This function creates a new empty section called @var{name}
- and attaches it to the end of the chain of sections for the
- BFD supplied. An attempt to create a section with a name which
- is already in use, returns NULL without changing the section
- chain.
+ 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.
- Possible errors are:
- o invalid_operation - If output has already started for this BFD.
- o no_memory - If obstack alloc fails.
+ Return <<NULL>> and set <<bfd_error>> on error; possible errors are:
+ o <<bfd_error_invalid_operation>> - If output has already started for @var{abfd}.
+ o <<bfd_error_no_memory>> - If obstack alloc fails.
*/
-
-
sec_ptr
-DEFUN(bfd_make_section,(abfd, name),
- bfd *abfd AND
- CONST char * name)
+bfd_make_section_anyway (abfd, name)
+ bfd *abfd;
+ CONST char *name;
{
- asection *newsect;
- asection ** prev = &abfd->sections;
- asection * sect = abfd->sections;
-
- if (abfd->output_has_begun) {
- bfd_error = invalid_operation;
- return NULL;
- }
-
- if (strcmp(name, BFD_ABS_SECTION_NAME) == 0)
- {
- return &bfd_abs_section;
- }
- if (strcmp(name, BFD_COM_SECTION_NAME) == 0)
- {
- return &bfd_com_section;
- }
- if (strcmp(name, BFD_UND_SECTION_NAME) == 0)
- {
- return &bfd_und_section;
- }
-
- while (sect) {
- if (!strcmp(sect->name, name)) return NULL;
- prev = §->next;
- sect = sect->next;
- }
-
- newsect = (asection *) bfd_zalloc(abfd, sizeof (asection));
- if (newsect == NULL) {
- bfd_error = no_memory;
+ asection *newsect;
+ asection **prev = &abfd->sections;
+ asection *sect = abfd->sections;
+
+ if (abfd->output_has_begun)
+ {
+ bfd_set_error (bfd_error_invalid_operation);
+ return NULL;
+ }
+
+ while (sect)
+ {
+ prev = §->next;
+ sect = sect->next;
+ }
+
+ newsect = (asection *) bfd_zalloc (abfd, sizeof (asection));
+ if (newsect == NULL)
return NULL;
- }
newsect->name = name;
newsect->index = abfd->section_count++;
newsect->flags = SEC_NO_FLAGS;
- newsect->userdata = 0;
- newsect->next = (asection *)NULL;
- newsect->relocation = (arelent *)NULL;
+ newsect->userdata = NULL;
+ newsect->contents = NULL;
+ newsect->next = (asection *) NULL;
+ newsect->relocation = (arelent *) NULL;
newsect->reloc_count = 0;
- newsect->line_filepos =0;
+ newsect->line_filepos = 0;
newsect->owner = abfd;
-/* Create a symbol whos only job is to point to this section. This is
- usfull for things like relocs which are relative to the base of a
- section
- */
- newsect->symbol = bfd_make_empty_symbol(abfd);
+ /* Create a symbol whos only job is to point to this section. This is
+ useful for things like relocs which are relative to the base of a
+ section. */
+ newsect->symbol = bfd_make_empty_symbol (abfd);
+ if (newsect->symbol == NULL)
+ return NULL;
newsect->symbol->name = name;
newsect->symbol->value = 0;
newsect->symbol->section = newsect;
newsect->symbol->flags = BSF_SECTION_SYM;
-
newsect->symbol_ptr_ptr = &newsect->symbol;
-
- if (BFD_SEND (abfd, _new_section_hook, (abfd, newsect)) != true) {
- free (newsect);
- return NULL;
- }
+
+ if (BFD_SEND (abfd, _new_section_hook, (abfd, newsect)) != true)
+ {
+ free (newsect);
+ return NULL;
+ }
*prev = newsect;
return newsect;
}
+/*
+FUNCTION
+ bfd_make_section
+
+SYNOPSIS
+ asection *bfd_make_section(bfd *, CONST char *name);
+
+DESCRIPTION
+ Like <<bfd_make_section_anyway>>, but return <<NULL>> (without calling
+ bfd_set_error ()) without changing the section chain if there is already a
+ section named @var{name}. If there is an error, return <<NULL>> and set
+ <<bfd_error>>.
+*/
+
+asection *
+bfd_make_section (abfd, name)
+ bfd *abfd;
+ CONST char *name;
+{
+ asection *sect = abfd->sections;
+
+ if (strcmp (name, BFD_ABS_SECTION_NAME) == 0)
+ {
+ return bfd_abs_section_ptr;
+ }
+ if (strcmp (name, BFD_COM_SECTION_NAME) == 0)
+ {
+ return bfd_com_section_ptr;
+ }
+ if (strcmp (name, BFD_UND_SECTION_NAME) == 0)
+ {
+ return bfd_und_section_ptr;
+ }
+
+ if (strcmp (name, BFD_IND_SECTION_NAME) == 0)
+ {
+ return bfd_ind_section_ptr;
+ }
+
+ while (sect)
+ {
+ if (!strcmp (sect->name, name))
+ return NULL;
+ sect = sect->next;
+ }
+
+ /* The name is not already used; go ahead and make a new section. */
+ return bfd_make_section_anyway (abfd, name);
+}
+
/*
FUNCTION
bfd_set_section_flags
SYNOPSIS
- boolean bfd_set_section_flags(bfd *, asection *, flagword);
+ boolean bfd_set_section_flags(bfd *abfd, asection *sec, flagword flags);
DESCRIPTION
- 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:
+ Set the attributes of the section @var{sec} in the BFD
+ @var{abfd} to the value @var{flags}. Return <<true>> on success,
+ <<false>> on error. Possible error returns are:
- o invalid operation
+ o <<bfd_error_invalid_operation>> -
The section cannot have one or more of the attributes
requested. For example, a .bss section in <<a.out>> may not
have the <<SEC_HAS_CONTENTS>> field set.
*/
+/*ARGSUSED*/
boolean
-DEFUN(bfd_set_section_flags,(abfd, section, flags),
- bfd *abfd AND
- sec_ptr section AND
- flagword flags)
+bfd_set_section_flags (abfd, section, flags)
+ bfd *abfd;
+ sec_ptr section;
+ flagword flags;
{
- if ((flags & bfd_applicable_section_flags (abfd)) != flags) {
- bfd_error = invalid_operation;
- return false;
- }
+#if 0
+ /* If you try to copy a text section from an input file (where it
+ has the SEC_CODE flag set) to an output file, this loses big if
+ the bfd_applicable_section_flags (abfd) doesn't have the SEC_CODE
+ set - which it doesn't, at least not for a.out. FIXME */
+
+ if ((flags & bfd_applicable_section_flags (abfd)) != flags)
+ {
+ bfd_set_error (bfd_error_invalid_operation);
+ return false;
+ }
+#endif
section->flags = flags;
return true;
bfd_map_over_sections
SYNOPSIS
- void bfd_map_over_sections(bfd *abfd, void (*func)(), PTR obj);
+ void bfd_map_over_sections(bfd *abfd,
+ void (*func)(bfd *abfd,
+ asection *sect,
+ PTR obj),
+ PTR obj);
DESCRIPTION
- Calls the provided function @var{func} for each section
+ 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
+ argument. The function will be called as if by
| func(abfd, the_section, obj);
- This is the prefered method for iterating over sections, an
+ This is the prefered method for iterating over sections; an
alternative would be to use a loop:
| section *p;
/*VARARGS2*/
void
-DEFUN(bfd_map_over_sections,(abfd, operation, user_storage),
- bfd *abfd AND
- void (*operation)() AND
- PTR user_storage)
+bfd_map_over_sections (abfd, operation, user_storage)
+ bfd *abfd;
+ void (*operation) PARAMS ((bfd * abfd, asection * sect, PTR obj));
+ PTR user_storage;
{
asection *sect;
- int i = 0;
-
+ unsigned int i = 0;
+
for (sect = abfd->sections; sect != NULL; i++, sect = sect->next)
(*operation) (abfd, sect, user_storage);
- if (i != abfd->section_count) /* Debugging */
- abort();
+ if (i != abfd->section_count) /* Debugging */
+ abort ();
}
bfd_set_section_size
SYNOPSIS
- boolean bfd_set_section_size(bfd *, asection *, bfd_size_type val);
+ boolean bfd_set_section_size(bfd *abfd, asection *sec, bfd_size_type val);
DESCRIPTION
- Sets @var{section} to the size @var{val}. If the operation is
- ok, then <<true>> is returned, else <<false>>.
+ Set @var{sec} to the size @var{val}. If the operation is
+ ok, then <<true>> is returned, else <<false>>.
Possible error returns:
- o invalid_operation
- Writing has started to the BFD, so setting the size is invalid
+ o <<bfd_error_invalid_operation>> -
+ Writing has started to the BFD, so setting the size is invalid.
*/
boolean
-DEFUN(bfd_set_section_size,(abfd, ptr, val),
- bfd *abfd AND
- sec_ptr ptr AND
- bfd_size_type val)
+bfd_set_section_size (abfd, ptr, val)
+ bfd *abfd;
+ sec_ptr ptr;
+ bfd_size_type val;
{
/* Once you've started writing to any section you cannot create or change
the size of any others. */
- if (abfd->output_has_begun) {
- bfd_error = invalid_operation;
- return false;
- }
+ if (abfd->output_has_begun)
+ {
+ bfd_set_error (bfd_error_invalid_operation);
+ return false;
+ }
ptr->_cooked_size = val;
ptr->_raw_size = val;
-
+
return true;
}
SYNOPSIS
boolean bfd_set_section_contents
- (bfd *abfd,
+ (bfd *abfd,
asection *section,
PTR data,
file_ptr offset,
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.
+ @var{offset} for @var{count} bytes.
Normally <<true>> is returned, else <<false>>. Possible error
returns are:
- o no_contents
+ o <<bfd_error_no_contents>> -
The output section does not have the <<SEC_HAS_CONTENTS>>
attribute, so nothing can be written to it.
o and some more too
*/
+#define bfd_get_section_size_now(abfd,sec) \
+(sec->reloc_done \
+ ? bfd_get_section_size_after_reloc (sec) \
+ : bfd_get_section_size_before_reloc (sec))
+
boolean
-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_set_section_contents (abfd, section, location, offset, count)
+ bfd *abfd;
+ sec_ptr section;
+ PTR 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_get_section_flags (abfd, section) & SEC_HAS_CONTENTS))
+ {
+ bfd_set_error (bfd_error_no_contents);
+ return (false);
+ }
+
+ if (offset < 0)
+ {
+ bad_val:
+ bfd_set_error (bfd_error_bad_value);
+ return false;
+ }
+ sz = bfd_get_section_size_now (abfd, section);
+ if ((bfd_size_type) offset > sz
+ || count > sz
+ || offset + count > sz)
+ goto bad_val;
+
+ switch (abfd->direction)
+ {
+ case read_direction:
+ case no_direction:
+ bfd_set_error (bfd_error_invalid_operation);
+ return false;
+
+ case write_direction:
+ break;
+
+ case both_direction:
+ /* File is opened for update. `output_has_begun' some time ago when
+ the file was created. Do not recompute sections sizes or alignments
+ in _bfd_set_section_content. */
+ abfd->output_has_begun = true;
+ break;
+ }
if (BFD_SEND (abfd, _bfd_set_section_contents,
- (abfd, section, location, offset, count)))
- {
- abfd->output_has_begun = true;
- return true;
- }
+ (abfd, section, location, offset, count)))
+ {
+ abfd->output_has_begun = true;
+ return true;
+ }
return false;
}
bfd_get_section_contents
SYNOPSIS
- boolean bfd_get_section_contents
+ boolean bfd_get_section_contents
(bfd *abfd, asection *section, PTR location,
file_ptr offset, bfd_size_type count);
DESCRIPTION
- This function reads data from @var{section} in BFD @var{abfd}
+ 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 constuctor with the <<SEC_CONSTUCTOR>>
- flag set are requested, then the @var{location} is filled with
- zeroes. If no errors occur, <<true>> is returned, else
+ If the contents of a constructor with the <<SEC_CONSTRUCTOR>>
+ flag set are requested or if the section does not have the
+ <<SEC_HAS_CONTENTS>> flag set, then the @var{location} is filled
+ with zeroes. If no errors occur, <<true>> is returned, else
<<false>>.
*/
boolean
-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)
+bfd_get_section_contents (abfd, section, location, offset, count)
+ bfd *abfd;
+ sec_ptr section;
+ PTR location;
+ file_ptr offset;
+ bfd_size_type count;
{
- 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)));
- }
-}
+ bfd_size_type sz;
+ if (section->flags & SEC_CONSTRUCTOR)
+ {
+ memset (location, 0, (unsigned) count);
+ return true;
+ }
-/* Initialize the internal data structures */
-DEFUN_VOID(bfd_section_init)
-{
+ if (offset < 0)
+ {
+ bad_val:
+ bfd_set_error (bfd_error_bad_value);
+ return false;
+ }
+ /* Even if reloc_done is true, this function reads unrelocated
+ contents, so we want the raw size. */
+ sz = section->_raw_size;
+ if ((bfd_size_type) offset > sz || count > sz || offset + count > sz)
+ goto bad_val;
- bfd_com_symbol = (asymbol *)zalloc(sizeof(asymbol));
- bfd_com_symbol->name = BFD_COM_SECTION_NAME;
- bfd_com_symbol->flags = BSF_SECTION_SYM;
- bfd_com_symbol->section = &bfd_com_section;
- bfd_com_section.symbol = bfd_com_symbol;
- bfd_com_section.symbol_ptr_ptr = &bfd_com_symbol;
- bfd_com_section.output_section = &bfd_com_section;
-
+ if (count == 0)
+ /* Don't bother. */
+ return true;
+ if ((section->flags & SEC_HAS_CONTENTS) == 0)
+ {
+ memset (location, 0, (unsigned) count);
+ return true;
+ }
- bfd_und_symbol = (asymbol *)zalloc(sizeof(asymbol));
- bfd_und_symbol->name = BFD_UND_SECTION_NAME;
- bfd_und_symbol->flags = BSF_SECTION_SYM;
- bfd_und_symbol->section = &bfd_und_section;
- bfd_und_section.symbol = bfd_und_symbol;
- bfd_und_section.symbol_ptr_ptr = &bfd_und_symbol;
- bfd_und_section.output_section = &bfd_und_section;
+ if ((section->flags & SEC_IN_MEMORY) != 0)
+ {
+ memcpy (location, section->contents + offset, (size_t) count);
+ return true;
+ }
- bfd_abs_symbol = (asymbol *)zalloc(sizeof(asymbol));
- bfd_abs_symbol->name = BFD_ABS_SECTION_NAME;
- bfd_abs_symbol->flags = BSF_SECTION_SYM;
- bfd_abs_symbol->section = &bfd_abs_section;
- bfd_abs_section.symbol = bfd_abs_symbol;
- bfd_abs_section.symbol_ptr_ptr = &bfd_abs_symbol;
- bfd_abs_section.output_section = &bfd_abs_section;
+ return BFD_SEND (abfd, _bfd_get_section_contents,
+ (abfd, section, location, offset, count));
+}
-
-
+/*
+FUNCTION
+ bfd_copy_private_section_data
+SYNOPSIS
+ boolean bfd_copy_private_section_data(bfd *ibfd, asection *isec, bfd *obfd, asection *osec);
-}
+DESCRIPTION
+ Copy private section information from @var{isec} in the BFD
+ @var{ibfd} to the section @var{osec} in the BFD @var{obfd}.
+ Return <<true>> on success, <<false>> on error. Possible error
+ returns are:
+
+ o <<bfd_error_no_memory>> -
+ Not enough memory exists to create private data for @var{osec}.
+
+.#define bfd_copy_private_section_data(ibfd, isection, obfd, osection) \
+. BFD_SEND (obfd, _bfd_copy_private_section_data, \
+. (ibfd, isection, obfd, osection))
+*/
projects / binutils.git / blobdiff