/* Object file "section" support for the BFD library.
Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
- 2000, 2001
+ 2000, 2001, 2002
Free Software Foundation, Inc.
Written by Cygnus Support.
.{
. {* 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 sec *next;
.
. {* The field flags contains attributes of the section. Some
. flags are read in from the object file, and some are
. synthesized from other information. *}
-.
. flagword flags;
.
.#define SEC_NO_FLAGS 0x000
. standard data. *}
.#define SEC_CONSTRUCTOR 0x100
.
-. {* The section is a constructor, and should be placed at the
-. end of the text, data, or bss section(?). *}
-.#define SEC_CONSTRUCTOR_TEXT 0x1100
-.#define SEC_CONSTRUCTOR_DATA 0x2100
-.#define SEC_CONSTRUCTOR_BSS 0x3100
-.
. {* The section has contents - a data section could be
. <<SEC_ALLOC>> | <<SEC_HAS_CONTENTS>>; a debug section could be
. <<SEC_HAS_CONTENTS>> *}
. sections. *}
.#define SEC_COFF_SHARED_LIBRARY 0x800
.
+. {* The section contains thread local data. *}
+.#define SEC_THREAD_LOCAL 0x1000
+.
. {* 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
. 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. *}
-.
+. information. *}
. bfd_vma lma;
.
. {* The size of the section in octets, as it will be output.
. Contains a value even if the section has no contents (e.g., the
. size of <<.bss>>). This will be filled in after relocation. *}
-.
. bfd_size_type _cooked_size;
.
. {* The original size on disk of the section, in octets. Normally this
. value is the same as the size, but if some relaxing has
. been done, then this value will be bigger. *}
-.
. bfd_size_type _raw_size;
.
. {* If this section is going to be output, then this value is the
. 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 sec *output_section;
.
. {* The alignment requirement of the section, as an exponent of 2 -
. e.g., 3 aligns to 2^3 (or 8). *}
-.
. unsigned int alignment_power;
.
. {* If an input section, a pointer to a vector of relocation
. records for the data in this section. *}
-.
. struct reloc_cache_entry *relocation;
.
. {* If an output section, a pointer to a vector of pointers to
. relocation records for the data in this section. *}
-.
. struct reloc_cache_entry **orelocation;
.
-. {* The number of relocation records in one of the above *}
-.
+. {* The number of relocation records in one of the above. *}
. unsigned reloc_count;
.
. {* Information below is back end specific - and not always used
. or updated. *}
.
. {* File position of section data. *}
-.
. file_ptr filepos;
.
. {* File position of relocation info. *}
-.
. file_ptr rel_filepos;
.
. {* File position of line data. *}
-.
. file_ptr line_filepos;
.
. {* Pointer to data for applications. *}
-.
. PTR userdata;
.
. {* If the SEC_IN_MEMORY flag is set, this points to the actual
. 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;
.
. {* Optional information about a COMDAT entry; NULL if not COMDAT. *}
-.
. struct bfd_comdat_info *comdat;
.
. {* When a section is being output, this value changes as more
. linenumbers are written out. *}
-.
. file_ptr moving_line_filepos;
.
. {* What the section number is in the target world. *}
-.
. int target_index;
.
. PTR used_by_bfd;
.
. {* If this is a constructor section then here is a list of the
. relocations created to relocate items within it. *}
-.
. struct relent_chain *constructor_chain;
.
. {* The BFD which owns the section. *}
-.
. bfd *owner;
.
-. {* A symbol which points at this section only *}
+. {* A symbol which points at this section only. *}
. struct symbol_cache_entry *symbol;
. struct symbol_cache_entry **symbol_ptr_ptr;
.
. struct bfd_link_order *link_order_head;
. struct bfd_link_order *link_order_tail;
-.} asection ;
+.} asection;
.
.{* These sections are global, and are managed by BFD. The application
. and target back end are not permitted to change the values in
.#define BFD_COM_SECTION_NAME "*COM*"
.#define BFD_IND_SECTION_NAME "*IND*"
.
-.{* the absolute section *}
+.{* The absolute section. *}
.extern const asection bfd_abs_section;
.#define bfd_abs_section_ptr ((asection *) &bfd_abs_section)
.#define bfd_is_abs_section(sec) ((sec) == bfd_abs_section_ptr)
-.{* Pointer to the undefined section *}
+.{* Pointer to the undefined section. *}
.extern const asection bfd_und_section;
.#define bfd_und_section_ptr ((asection *) &bfd_und_section)
.#define bfd_is_und_section(sec) ((sec) == bfd_und_section_ptr)
-.{* Pointer to the common section *}
+.{* Pointer to the common section. *}
.extern const asection bfd_com_section;
.#define bfd_com_section_ptr ((asection *) &bfd_com_section)
-.{* Pointer to the indirect section *}
+.{* 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)
.#define bfd_get_section_size_after_reloc(section) \
. ((section)->reloc_done ? (section)->_cooked_size \
. : (abort (), (bfd_size_type) 1))
+.
+.{* 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, PS) \
+. do \
+. { \
+. asection **_ps = PS; \
+. asection *_s = *_ps; \
+. *_ps = _s->next; \
+. if (_s->next == NULL) \
+. (ABFD)->section_tail = _ps; \
+. } \
+. while (0)
+.#define bfd_section_list_insert(ABFD, PS, S) \
+. do \
+. { \
+. asection **_ps = PS; \
+. asection *_s = S; \
+. _s->next = *_ps; \
+. *_ps = _s; \
+. if (_s->next == NULL) \
+. (ABFD)->section_tail = &_s->next; \
+. } \
+. while (0)
+.
*/
/* We use a macro to initialize the static asymbol structures because
subclass. */
if (entry == NULL)
{
- entry = bfd_hash_allocate (table, sizeof (struct section_hash_entry));
+ entry = (struct bfd_hash_entry *)
+ bfd_hash_allocate (table, sizeof (struct section_hash_entry));
if (entry == NULL)
return entry;
}
newsect->id = section_id;
newsect->index = abfd->section_count;
- newsect->flags = SEC_NO_FLAGS;
-
- newsect->userdata = NULL;
- newsect->contents = NULL;
- newsect->next = (asection *) NULL;
- newsect->relocation = (arelent *) NULL;
- newsect->reloc_count = 0;
- newsect->line_filepos = 0;
newsect->owner = abfd;
- newsect->comdat = NULL;
/* Create a symbol whose only job is to point to this section. This
is useful for things like relocs which are relative to the base
These are the functions exported by the section handling part of BFD.
*/
+/*
+FUNCTION
+ bfd_section_list_clear
+
+SYNOPSIS
+ void bfd_section_list_clear (bfd *);
+
+DESCRIPTION
+ Clears the section list, and also resets the section count and
+ hash table entries.
+*/
+
+void
+bfd_section_list_clear (abfd)
+ bfd *abfd;
+{
+ abfd->sections = NULL;
+ abfd->section_tail = &abfd->sections;
+ abfd->section_count = 0;
+ memset ((PTR) abfd->section_htab.table, 0,
+ abfd->section_htab.size * sizeof (struct bfd_hash_entry *));
+}
+
/*
FUNCTION
bfd_get_section_by_name
{
struct section_hash_entry *sh;
- sh = section_hash_lookup (&abfd->section_htab, name, false, false);
+ sh = section_hash_lookup (&abfd->section_htab, name, FALSE, FALSE);
if (sh != NULL)
return &sh->section;
sname = bfd_malloc ((bfd_size_type) len + 8);
if (sname == NULL)
return NULL;
- strcpy (sname, templat);
+ memcpy (sname, templat, len);
num = 1;
if (count != NULL)
num = *count;
abort ();
sprintf (sname + len, ".%d", num++);
}
- while (section_hash_lookup (&abfd->section_htab, sname, false, false));
+ while (section_hash_lookup (&abfd->section_htab, sname, FALSE, FALSE));
if (count != NULL)
*count = num;
if (strcmp (name, BFD_IND_SECTION_NAME) == 0)
return bfd_ind_section_ptr;
- sh = section_hash_lookup (&abfd->section_htab, name, true, false);
+ sh = section_hash_lookup (&abfd->section_htab, name, TRUE, FALSE);
if (sh == NULL)
return NULL;
return NULL;
}
- sh = section_hash_lookup (&abfd->section_htab, name, true, false);
+ sh = section_hash_lookup (&abfd->section_htab, name, TRUE, FALSE);
if (sh == NULL)
return NULL;
|| strcmp (name, BFD_IND_SECTION_NAME) == 0)
return NULL;
- sh = section_hash_lookup (&abfd->section_htab, name, true, false);
+ sh = section_hash_lookup (&abfd->section_htab, name, TRUE, FALSE);
if (sh == NULL)
return NULL;
bfd_set_section_flags
SYNOPSIS
- boolean bfd_set_section_flags(bfd *abfd, asection *sec, flagword flags);
+ bfd_boolean bfd_set_section_flags (bfd *abfd, asection *sec, flagword flags);
DESCRIPTION
Set the attributes of the section @var{sec} in the BFD
- @var{abfd} to the value @var{flags}. Return <<true>> on success,
- <<false>> on error. Possible error returns are:
+ @var{abfd} to the value @var{flags}. Return <<TRUE>> on success,
+ <<FALSE>> on error. Possible error returns are:
o <<bfd_error_invalid_operation>> -
The section cannot have one or more of the attributes
*/
/*ARGSUSED*/
-boolean
+bfd_boolean
bfd_set_section_flags (abfd, section, flags)
bfd *abfd ATTRIBUTE_UNUSED;
sec_ptr section;
if ((flags & bfd_applicable_section_flags (abfd)) != flags)
{
bfd_set_error (bfd_error_invalid_operation);
- return false;
+ return FALSE;
}
#endif
section->flags = flags;
- return true;
+ return TRUE;
}
/*
bfd_set_section_size
SYNOPSIS
- boolean bfd_set_section_size(bfd *abfd, asection *sec, bfd_size_type val);
+ bfd_boolean bfd_set_section_size (bfd *abfd, asection *sec, bfd_size_type val);
DESCRIPTION
Set @var{sec} to the size @var{val}. If the operation is
- ok, then <<true>> is returned, else <<false>>.
+ ok, then <<TRUE>> is returned, else <<FALSE>>.
Possible error returns:
o <<bfd_error_invalid_operation>> -
*/
-boolean
+bfd_boolean
bfd_set_section_size (abfd, ptr, val)
bfd *abfd;
sec_ptr ptr;
if (abfd->output_has_begun)
{
bfd_set_error (bfd_error_invalid_operation);
- return false;
+ return FALSE;
}
ptr->_cooked_size = val;
ptr->_raw_size = val;
- return true;
+ return TRUE;
}
/*
bfd_set_section_contents
SYNOPSIS
- boolean bfd_set_section_contents (bfd *abfd, asection *section,
- PTR data, file_ptr offset,
- bfd_size_type count);
+ bfd_boolean bfd_set_section_contents (bfd *abfd, asection *section,
+ PTR data, file_ptr offset,
+ bfd_size_type count);
DESCRIPTION
Sets the contents of the section @var{section} in BFD
data is written to the output section starting at offset
@var{offset} for @var{count} octets.
- Normally <<true>> is returned, else <<false>>. Possible error
+ Normally <<TRUE>> is returned, else <<FALSE>>. Possible error
returns are:
o <<bfd_error_no_contents>> -
The output section does not have the <<SEC_HAS_CONTENTS>>
? bfd_get_section_size_after_reloc (sec) \
: bfd_get_section_size_before_reloc (sec))
-boolean
+bfd_boolean
bfd_set_section_contents (abfd, section, location, offset, count)
bfd *abfd;
sec_ptr section;
if (!(bfd_get_section_flags (abfd, section) & SEC_HAS_CONTENTS))
{
bfd_set_error (bfd_error_no_contents);
- return (false);
+ return FALSE;
}
sz = bfd_get_section_size_now (abfd, section);
|| count != (size_t) count)
{
bfd_set_error (bfd_error_bad_value);
- return false;
+ return FALSE;
}
switch (abfd->direction)
case read_direction:
case no_direction:
bfd_set_error (bfd_error_invalid_operation);
- return false;
+ return FALSE;
case write_direction:
break;
/* 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;
+ abfd->output_has_begun = TRUE;
break;
}
/* Record a copy of the data in memory if desired. */
if (section->contents
- && location != section->contents + offset)
+ && location != (PTR) (section->contents + offset))
memcpy (section->contents + offset, location, (size_t) count);
if (BFD_SEND (abfd, _bfd_set_section_contents,
(abfd, section, location, offset, count)))
{
- abfd->output_has_begun = true;
- return true;
+ abfd->output_has_begun = TRUE;
+ return TRUE;
}
- return false;
+ return FALSE;
}
/*
bfd_get_section_contents
SYNOPSIS
- boolean bfd_get_section_contents (bfd *abfd, asection *section,
- PTR location, file_ptr offset,
- bfd_size_type count);
+ bfd_boolean bfd_get_section_contents (bfd *abfd, asection *section,
+ PTR location, file_ptr offset,
+ bfd_size_type count);
DESCRIPTION
Read data from @var{section} in BFD @var{abfd}
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>>.
+ with zeroes. If no errors occur, <<TRUE>> is returned, else
+ <<FALSE>>.
*/
-boolean
+bfd_boolean
bfd_get_section_contents (abfd, section, location, offset, count)
bfd *abfd;
sec_ptr section;
if (section->flags & SEC_CONSTRUCTOR)
{
memset (location, 0, (size_t) count);
- return true;
+ return TRUE;
}
- /* Even if reloc_done is true, this function reads unrelocated
+ /* 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 != (size_t) count)
{
bfd_set_error (bfd_error_bad_value);
- return false;
+ return FALSE;
}
if (count == 0)
/* Don't bother. */
- return true;
+ return TRUE;
if ((section->flags & SEC_HAS_CONTENTS) == 0)
{
memset (location, 0, (size_t) count);
- return true;
+ return TRUE;
}
if ((section->flags & SEC_IN_MEMORY) != 0)
{
memcpy (location, section->contents + offset, (size_t) count);
- return true;
+ return TRUE;
}
return BFD_SEND (abfd, _bfd_get_section_contents,
bfd_copy_private_section_data
SYNOPSIS
- boolean bfd_copy_private_section_data (bfd *ibfd, asection *isec,
- bfd *obfd, asection *osec);
+ bfd_boolean bfd_copy_private_section_data (bfd *ibfd, asection *isec,
+ bfd *obfd, asection *osec);
DESCRIPTION
Copy private section information from @var{isec} in the BFD
@var{ibfd} to the section @var{osec} in the BFD @var{obfd}.
- Return <<true>> on success, <<false>> on error. Possible error
+ Return <<TRUE>> on success, <<FALSE>> on error. Possible error
returns are:
o <<bfd_error_no_memory>> -
DESCRIPTION
Remove @var{section} from the output. If the output section
- becomes empty, remove it from the output bfd. @var{info} may
- be NULL; if it is not, it is used to decide whether the output
- section is empty.
+ becomes empty, remove it from the output bfd.
+
+ This function won't actually do anything except twiddle flags
+ if called too late in the linking process, when it's not safe
+ to remove sections.
*/
void
_bfd_strip_section_from_output (info, s)
struct bfd_link_info *info;
asection *s;
{
- asection **spp, *os;
- struct bfd_link_order *p, *pp;
- boolean keep_os;
+ asection *os;
+ asection *is;
+ bfd *abfd;
- /* Excise the input section from the link order.
+ s->flags |= SEC_EXCLUDE;
- FIXME: For all calls that I can see to this function, the link
- orders have not yet been set up. So why are we checking them? --
- Ian */
+ /* If the section wasn't assigned to an output section, or the
+ section has been discarded by the linker script, there's nothing
+ more to do. */
os = s->output_section;
-
- /* Handle a section that wasn't output. */
- if (os == NULL)
+ if (os == NULL || os->owner == NULL)
return;
- for (p = os->link_order_head, pp = NULL; p != NULL; pp = p, p = p->next)
- if (p->type == bfd_indirect_link_order
- && p->u.indirect.section == s)
- {
- if (pp)
- pp->next = p->next;
- else
- os->link_order_head = p->next;
- if (!p->next)
- os->link_order_tail = pp;
- break;
- }
-
- keep_os = os->link_order_head != NULL;
-
- if (! keep_os && info != NULL)
- {
- bfd *abfd;
- for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
- {
- asection *is;
- for (is = abfd->sections; is != NULL; is = is->next)
- {
- if (is != s && is->output_section == os
- && (is->flags & SEC_EXCLUDE) == 0)
- break;
- }
- if (is != NULL)
- break;
- }
- if (abfd != NULL)
- keep_os = true;
- }
+ /* If the output section has other (non-excluded) input sections, we
+ can't remove it. */
+ for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
+ for (is = abfd->sections; is != NULL; is = is->next)
+ if (is->output_section == os && (is->flags & SEC_EXCLUDE) == 0)
+ return;
- /* If the output section is empty, remove it too. Careful about sections
- that have been discarded in the link script -- they are mapped to
- bfd_abs_section, which has no owner. */
- if (!keep_os && os->owner != NULL)
- {
- for (spp = &os->owner->sections; *spp; spp = &(*spp)->next)
- if (*spp == os)
- {
- *spp = os->next;
- if (os->next == NULL)
- os->owner->section_tail = spp;
- os->owner->section_count--;
- break;
- }
- }
+ /* If the output section is empty, flag it for removal too.
+ See ldlang.c:strip_excluded_output_sections for the action. */
+ os->flags |= SEC_EXCLUDE;
+}
- s->flags |= SEC_EXCLUDE;
+/*
+FUNCTION
+ bfd_generic_discard_group
+
+SYNOPSIS
+ bfd_boolean bfd_generic_discard_group (bfd *abfd, asection *group);
+
+DESCRIPTION
+ Remove all members of @var{group} from the output.
+*/
+
+bfd_boolean
+bfd_generic_discard_group (abfd, group)
+ bfd *abfd ATTRIBUTE_UNUSED;
+ asection *group ATTRIBUTE_UNUSED;
+{
+ return TRUE;
}