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>>.
+ three sections, called <<.text>>, <<.data>> and <<.bss>>.
Names need not be unique; for example a COFF file may have several
sections named <<.data>>.
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>>.
+ 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
SUBSECTION
- Seclets
+ Link orders
- The data within a section is stored in a <<seclet>>. These
- are much like the fixups in <<gas>>. The seclet abstraction
- allows 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 seclet knows how big it is, and which is the next seclet and
- where the raw data for it is; it 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 seclet is used by the linker to perform relaxing on final
- code. The compiler 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 seclet by seclet basis.
+ a link_order by link_order basis.
*/
CODE_FRAGMENT
.
-.typedef struct sec
+.typedef struct sec
.{
. {* The name of the section; the name isn't a copy, the pointer is
. the same as that passed to bfd_make_section. *}
.
. {* Which section is it; 0..nth. *}
.
-. int index;
+. int index;
.
. {* The next section in the list belonging to the BFD, or NULL. *}
.
.
. {* 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;
.
. 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
. 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
+.
. {* End of section flags. *}
.
. {* The virtual memory address of the section - where it will be
. 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 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
.
. {* 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;
.
. 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 *seclets_head;
-. struct bfd_seclet *seclets_tail;
+. struct bfd_link_order *link_order_head;
+. struct bfd_link_order *link_order_tail;
.} asection ;
.
.
/* 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, &bfd_com_section },
- { 0, BFD_UND_SECTION_NAME, 0, BSF_SECTION_SYM, &bfd_und_section },
- { 0, BFD_ABS_SECTION_NAME, 0, BSF_SECTION_SYM, &bfd_abs_section },
- { 0, BFD_IND_SECTION_NAME, 0, BSF_SECTION_SYM, &bfd_ind_section },
+static CONST asymbol global_syms[] =
+{
+ /* the_bfd, name, value, attr, section [, udata] */
+ {0, BFD_COM_SECTION_NAME, 0, BSF_SECTION_SYM, &bfd_com_section},
+ {0, BFD_UND_SECTION_NAME, 0, BSF_SECTION_SYM, &bfd_und_section},
+ {0, BFD_ABS_SECTION_NAME, 0, BSF_SECTION_SYM, &bfd_abs_section},
+ {0, BFD_IND_SECTION_NAME, 0, BSF_SECTION_SYM, &bfd_ind_section},
};
#define STD_SECTION(SEC, FLAGS, SYM, NAME, IDX) \
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
- Run through the provided @var{abfd} and return the one of the
- <<asection>>s whose name matches @var{name}, 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
+ 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;
}
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
+ is already in use returns its pointer without changing the
section chain.
It has the funny name since this is the way it used to be
before it was rewritten....
Possible errors are:
- o 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;
}
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.
+ is already a section with that name.
- Returns NULL and sets bfd_error on error; possible errors are:
- o invalid_operation - If output has already started for @var{abfd}.
- 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
{
asection *newsect;
asection **prev = &abfd->sections;
- asection * sect = abfd->sections;
+ asection *sect = abfd->sections;
if (abfd->output_has_begun)
{
- bfd_error = invalid_operation;
+ bfd_set_error (bfd_error_invalid_operation);
return NULL;
}
- while (sect) {
- prev = §->next;
- sect = sect->next;
- }
+ while (sect)
+ {
+ prev = §->next;
+ sect = sect->next;
+ }
- newsect = (asection *) bfd_zalloc(abfd, sizeof (asection));
- if (newsect == NULL) {
- bfd_error = no_memory;
- return NULL;
- }
+ newsect = (asection *) bfd_zalloc (abfd, sizeof (asection));
+ if (newsect == NULL)
+ {
+ bfd_set_error (bfd_error_no_memory);
+ 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
useful for things like relocs which are relative to the base of a
section. */
- newsect->symbol = bfd_make_empty_symbol(abfd);
+ newsect->symbol = bfd_make_empty_symbol (abfd);
+ if (!newsect)
+ return NULL;
newsect->symbol->name = name;
newsect->symbol->value = 0;
newsect->symbol->section = newsect;
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;
asection *bfd_make_section(bfd *, CONST char *name);
DESCRIPTION
- Like <<bfd_make_section_anyway>>, but return NULL (without setting
- bfd_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.
+ 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>>.
*/
sec_ptr
-DEFUN(bfd_make_section,(abfd, name),
- bfd *abfd AND
- CONST char * name)
+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;
- }
- if (strcmp(name, BFD_COM_SECTION_NAME) == 0)
- {
- return &bfd_com_section;
- }
- if (strcmp(name, BFD_UND_SECTION_NAME) == 0)
- {
- return &bfd_und_section;
- }
-
- if (strcmp(name, BFD_IND_SECTION_NAME) == 0)
- {
- return &bfd_ind_section;
- }
-
- while (sect) {
- if (!strcmp(sect->name, name)) return NULL;
- sect = sect->next;
- }
+ asection *sect = abfd->sections;
+
+ 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;
+ }
+
+ if (strcmp (name, BFD_IND_SECTION_NAME) == 0)
+ {
+ return &bfd_ind_section;
+ }
+
+ 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);
DESCRIPTION
Set the attributes of the section @var{sec} in the BFD
- @var{abfd} to the value @var{flags}. Returns <<true>> on success,
+ @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 0
/* If you try to copy a text section from an input file (where it
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_error = invalid_operation;
- return false;
- }
+ if ((flags & bfd_applicable_section_flags (abfd)) != flags)
+ {
+ bfd_set_error (bfd_error_invalid_operation);
+ return false;
+ }
#endif
section->flags = flags;
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
+ argument. The function will be called as if by
| func(abfd, the_section, obj);
/*VARARGS2*/
void
-DEFUN(bfd_map_over_sections,(abfd, operation, user_storage),
- bfd *abfd AND
- void (*operation) PARAMS ((bfd *abfd, asection *sect, PTR obj)) 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;
-
+
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 ();
}
DESCRIPTION
Set @var{sec} to the size @var{val}. If the operation is
- ok, then <<true>> is returned, else <<false>>.
+ 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
: 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;
{
bfd_size_type sz;
- if (!bfd_get_section_flags(abfd, section) & SEC_HAS_CONTENTS)
- {
- bfd_error = no_contents;
- return(false);
- }
+ 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_error = bad_value;
+ bfd_set_error (bfd_error_bad_value);
return false;
}
sz = bfd_get_section_size_now (abfd, section);
switch (abfd->direction)
{
- case read_direction:
- case no_direction:
- bfd_error = invalid_operation;
- return false;
+ case read_direction:
+ case no_direction:
+ bfd_set_error (bfd_error_invalid_operation);
+ return false;
- case write_direction:
- break;
+ case write_direction:
+ break;
- case both_direction:
- /* File is opened for update. `output_has_begun' some time ago when
+ 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;
+ 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);
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;
{
bfd_size_type sz;
- if (section->flags & SEC_CONSTRUCTOR)
+ if (section->flags & SEC_CONSTRUCTOR)
{
- memset(location, 0, (unsigned)count);
+ memset (location, 0, (unsigned) count);
return true;
}
if (offset < 0)
{
bad_val:
- bfd_error = bad_value;
+ bfd_set_error (bfd_error_bad_value);
return false;
}
- sz = bfd_get_section_size_now (abfd, section);
- if (offset > sz
- || count > sz
- || offset + count > sz)
+ /* Even if reloc_done is true, this function reads unrelocated
+ contents, so we want the raw size. */
+ sz = section->_raw_size;
+ if (offset > sz || count > sz || offset + count > sz)
goto bad_val;
if (count == 0)
/* Don't bother. */
return true;
+ if ((section->flags & SEC_HAS_CONTENTS) == 0)
+ {
+ memset (location, 0, (unsigned) count);
+ return true;
+ }
+
+ if ((section->flags & SEC_IN_MEMORY) != 0)
+ {
+ memcpy (location, section->contents + offset, count);
+ return true;
+ }
+
return BFD_SEND (abfd, _bfd_get_section_contents,
(abfd, section, location, offset, count));
}
projects / binutils.git / blobdiff