/* Object file "section" support for the BFD library.
- Copyright (C) 1990, 91, 92, 93, 94, 95, 1996 Free Software Foundation, Inc.
+ Copyright (C) 1990, 91, 92, 93, 94, 95, 96, 97, 98, 1999
+ Free Software Foundation, Inc.
Written by Cygnus Support.
This file is part of BFD, the Binary File Descriptor library.
#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"
-
+#include "bfdlink.h"
/*
DOCDD
CODE_FRAGMENT
.
+. {* This structure is used for a comdat section, as in PE. A comdat
+. section is associated with a particular symbol. When the linker
+. sees a comdat section, it keeps only one of the sections with a
+. given name and associated with a given symbol. *}
+.
+.struct bfd_comdat_info
+.{
+. {* The name of the symbol associated with a comdat section. *}
+. const char *name;
+.
+. {* The local symbol table index of the symbol associated with a
+. comdat section. This is only meaningful to the object file format
+. specific code; it is not an index into the list returned by
+. bfd_canonicalize_symtab. *}
+. long symbol;
+.
+. {* If this section is being discarded, the linker uses this field
+. to point to the input section which is being kept. *}
+. struct sec *sec;
+.};
+.
.typedef struct sec
.{
. {* The name of the section; the name isn't a copy, the pointer is
. standard data. *}
.#define SEC_CONSTRUCTOR 0x100
.
-. {* The section is a constuctor, and should be placed at the
+. {* 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
. sections. *}
.#define SEC_COFF_SHARED_LIBRARY 0x800
.
-. {* The section is a common section (symbols may be defined
+. {* 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
. 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
+.
+. {* This section should not be subject to garbage collection. *}
+.#define SEC_KEEP 0x1000000
+.
+. {* This section contains "short" data, and should be placed
+. "near" the GP. *}
+.#define SEC_SMALL_DATA 0x2000000
+.
+. {* This section contains data which may be shared with other
+. executables or shared objects. *}
+.#define SEC_SHARED 0x4000000
+.
. {* End of section flags. *}
.
. {* Some internal packed boolean fields. *}
. {* A mark flag used by some of the linker backends. *}
. unsigned int linker_mark : 1;
.
+. {* A mark flag used by some linker backends for garbage collection. *}
+. unsigned int gc_mark : 1;
+.
. {* End of internal packed boolean fields. *}
.
. {* The virtual memory address of the section - where it will be
.
. unsigned int lineno_count;
.
+. {* 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 *}
.
. ((section->reloc_done) ? (section)->_cooked_size: (abort(),1))
*/
+/* We use a macro to initialize the static asymbol structures because
+ traditional C does not permit us to initialize a union member while
+ gcc warns if we don't initialize it. */
+ /* the_bfd, name, value, attr, section [, udata] */
+#ifdef __STDC__
+#define GLOBAL_SYM_INIT(NAME, SECTION) \
+ { 0, NAME, 0, BSF_SECTION_SYM, (asection *) SECTION, { 0 }}
+#else
+#define GLOBAL_SYM_INIT(NAME, SECTION) \
+ { 0, NAME, 0, BSF_SECTION_SYM, (asection *) SECTION }
+#endif
+
/* 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},
+ GLOBAL_SYM_INIT (BFD_COM_SECTION_NAME, &bfd_com_section),
+ GLOBAL_SYM_INIT (BFD_UND_SECTION_NAME, &bfd_und_section),
+ GLOBAL_SYM_INIT (BFD_ABS_SECTION_NAME, &bfd_abs_section),
+ GLOBAL_SYM_INIT (BFD_IND_SECTION_NAME, &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 }
+ /* name, index, next, flags, set_vma, reloc_done, linker_mark, gc_mark */ \
+ { NAME, 0, 0, FLAGS, 0, 0, 0, 0, \
+ \
+ /* vma, lma, _cooked_size, _raw_size, output_offset, output_section, */ \
+ 0, 0, 0, 0, 0, (struct sec *) &SEC, \
+ \
+ /* alig..., reloc..., orel..., reloc_count, filepos, rel_..., line_... */ \
+ 0, 0, 0, 0, 0, 0, 0, \
+ \
+ /* userdata, contents, lineno, lineno_count */ \
+ 0, 0, 0, 0, \
+ \
+ /* comdat_info, moving_line_filepos, target_index, used_by_bfd, */ \
+ NULL, 0, 0, 0, \
+ \
+ /* cons..., owner, symbol */ \
+ 0, 0, (struct symbol_cache_entry *) &global_syms[IDX], \
+ \
+ /* symbol_ptr_ptr, link_order_head, ..._tail */ \
+ (struct symbol_cache_entry **) &SYM, 0, 0 \
+ }
STD_SECTION (bfd_com_section, SEC_IS_COMMON, bfd_com_symbol,
BFD_COM_SECTION_NAME, 0);
o <<bfd_error_invalid_operation>> -
If output has already started for this BFD.
o <<bfd_error_no_memory>> -
- If obstack alloc fails.
+ If memory allocation 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.
+ o <<bfd_error_no_memory>> - If memory allocation fails.
*/
sec_ptr
newsect->reloc_count = 0;
newsect->line_filepos = 0;
newsect->owner = abfd;
+ newsect->comdat = NULL;
/* 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
/*ARGSUSED*/
boolean
bfd_set_section_flags (abfd, section, flags)
- bfd *abfd;
+ bfd *abfd ATTRIBUTE_UNUSED;
sec_ptr section;
flagword flags;
{
Not enough memory exists to create private data for @var{osec}.
.#define bfd_copy_private_section_data(ibfd, isection, obfd, osection) \
-. BFD_SEND (ibfd, _bfd_copy_private_section_data, \
+. BFD_SEND (obfd, _bfd_copy_private_section_data, \
. (ibfd, isection, obfd, osection))
*/
+
+/*
+FUNCTION
+ _bfd_strip_section_from_output
+
+SYNOPSIS
+ void _bfd_strip_section_from_output
+ (asection *section);
+
+DESCRIPTION
+ Remove @var{section} from the output. If the output section becomes
+ empty, remove it from the output bfd.
+*/
+void
+_bfd_strip_section_from_output (s)
+ asection *s;
+{
+ asection **spp, *os;
+ struct bfd_link_order *p, *pp;
+
+ /* Excise the input section from the link order. */
+ os = s->output_section;
+ 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;
+ }
+
+ /* 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 (!os->link_order_head && os->owner)
+ {
+ for (spp = &os->owner->sections; *spp; spp = &(*spp)->next)
+ if (*spp == os)
+ {
+ *spp = os->next;
+ os->owner->section_count--;
+ break;
+ }
+ }
+}
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