/* bfdlink.h -- header file for BFD link routines
- Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002, 2003
- Free Software Foundation, Inc.
+ Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
+ 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
Written by Steve Chamberlain and Ian Lance Taylor, Cygnus Support.
This file is part of BFD, the Binary File Descriptor library.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+ MA 02110-1301, USA. */
#ifndef BFDLINK_H
#define BFDLINK_H
bfd_link_common_skip_all
};
+struct bfd_link_hash_common_entry
+ {
+ unsigned int alignment_power; /* Alignment. */
+ asection *section; /* Symbol section. */
+ };
+
/* The linking routines use a hash table which uses this structure for
its elements. */
/* Type of this entry. */
enum bfd_link_hash_type type;
- /* Undefined and common symbols are kept in a linked list through
- this field. This field is not in the union because that would
- force us to remove entries from the list when we changed their
- type, which would force the list to be doubly linked, which would
- waste more memory. When an undefined or common symbol is
- created, it should be added to this list, the head of which is in
- the link hash table itself. As symbols are defined, they need
- not be removed from the list; anything which reads the list must
- doublecheck the symbol type.
-
- Weak symbols are not kept on this list.
-
- Defined and defweak symbols use this field as a reference marker.
- If the field is not NULL, or this structure is the tail of the
- undefined symbol list, the symbol has been referenced. If the
- symbol is undefined and becomes defined, this field will
- automatically be non-NULL since the symbol will have been on the
- undefined symbol list. */
- struct bfd_link_hash_entry *und_next;
-
/* A union of information depending upon the type. */
union
{
/* bfd_link_hash_undefined, bfd_link_hash_undefweak. */
struct
{
+ /* Undefined and common symbols are kept in a linked list through
+ this field. This field is present in all of the union element
+ so that we don't need to remove entries from the list when we
+ change their type. Removing entries would either require the
+ list to be doubly linked, which would waste more memory, or
+ require a traversal. When an undefined or common symbol is
+ created, it should be added to this list, the head of which is in
+ the link hash table itself. As symbols are defined, they need
+ not be removed from the list; anything which reads the list must
+ doublecheck the symbol type.
+
+ Weak symbols are not kept on this list.
+
+ Defined and defweak symbols use this field as a reference marker.
+ If the field is not NULL, or this structure is the tail of the
+ undefined symbol list, the symbol has been referenced. If the
+ symbol is undefined and becomes defined, this field will
+ automatically be non-NULL since the symbol will have been on the
+ undefined symbol list. */
+ struct bfd_link_hash_entry *next;
bfd *abfd; /* BFD symbol was found in. */
+ bfd *weak; /* BFD weak symbol was found in. */
} undef;
/* bfd_link_hash_defined, bfd_link_hash_defweak. */
struct
{
- bfd_vma value; /* Symbol value. */
+ struct bfd_link_hash_entry *next;
asection *section; /* Symbol section. */
+ bfd_vma value; /* Symbol value. */
} def;
/* bfd_link_hash_indirect, bfd_link_hash_warning. */
struct
{
+ struct bfd_link_hash_entry *next;
struct bfd_link_hash_entry *link; /* Real symbol. */
const char *warning; /* Warning (bfd_link_hash_warning only). */
} i;
/* bfd_link_hash_common. */
struct
{
+ struct bfd_link_hash_entry *next;
/* The linker needs to know three things about common
symbols: the size, the alignment, and the section in
which the symbol should be placed. We store the size
directly because we don't want to increase the size of
the union; this structure is a major space user in the
linker. */
+ struct bfd_link_hash_common_entry *p;
bfd_size_type size; /* Common symbol size. */
- struct bfd_link_hash_common_entry
- {
- unsigned int alignment_power; /* Alignment. */
- asection *section; /* Symbol section. */
- } *p;
} c;
} u;
};
{
/* The hash table itself. */
struct bfd_hash_table table;
- /* The back end which created this hash table. This indicates the
- type of the entries in the hash table, which is sometimes
- important information when linking object files of different
- types together. */
- const bfd_target *creator;
/* A linked list of undefined and common symbols, linked through the
next field in the bfd_link_hash_entry structure. */
struct bfd_link_hash_entry *undefs;
extern void bfd_link_add_undef
(struct bfd_link_hash_table *, struct bfd_link_hash_entry *);
+/* Remove symbols from the undefs list that don't belong there. */
+extern void bfd_link_repair_undef_list
+ (struct bfd_link_hash_table *table);
+
+/* Read symbols and cache symbol pointer array in outsymbols. */
+extern bfd_boolean bfd_generic_link_read_symbols (bfd *);
+
struct bfd_sym_chain
{
struct bfd_sym_chain *next;
RM_GENERATE_ERROR
};
+struct bfd_elf_dynamic_list;
+
/* This structure holds all the information needed to communicate
between BFD and the linker when doing a link. */
/* TRUE if ok to have version with no definition. */
unsigned int allow_undefined_version: 1;
+ /* TRUE if a default symbol version should be created and used for
+ exported symbols. */
+ unsigned int create_default_symver: 1;
+
+ /* TRUE if a default symbol version should be created and used for
+ imported symbols. */
+ unsigned int default_imported_symver: 1;
+
/* TRUE if symbols should be retained in memory, FALSE if they
should be freed and reread. */
unsigned int keep_memory: 1;
/* TRUE if global symbols in discarded sections should be stripped. */
unsigned int strip_discarded: 1;
- /* TRUE if relaxation is being finalized. */
- unsigned int relax_finalizing: 1;
-
/* TRUE if generating a position independent executable. */
unsigned int pie: 1;
flags. */
unsigned int noexecstack: 1;
+ /* TRUE if PT_GNU_RELRO segment should be created. */
+ unsigned int relro: 1;
+
+ /* TRUE if we should warn when adding a DT_TEXTREL to a shared object. */
+ unsigned int warn_shared_textrel: 1;
+
+ /* TRUE if we should warn alternate ELF machine code. */
+ unsigned int warn_alternate_em: 1;
+
+ /* TRUE if unreferenced sections should be removed. */
+ unsigned int gc_sections: 1;
+
+ /* TRUE if user shoudl be informed of removed unreferenced sections. */
+ unsigned int print_gc_sections: 1;
+
+ /* TRUE if .hash section should be created. */
+ unsigned int emit_hash: 1;
+
+ /* TRUE if .gnu.hash section should be created. */
+ unsigned int emit_gnu_hash: 1;
+
+ /* If TRUE reduce memory overheads, at the expense of speed. This will
+ cause map file generation to use an O(N^2) algorithm and disable
+ caching ELF symbol buffer. */
+ unsigned int reduce_memory_overheads: 1;
+
+ /* TRUE if all data symbols should be dynamic. */
+ unsigned int dynamic_data: 1;
+
+ /* TRUE if some symbols have to be dynamic, controlled by
+ --dynamic-list command line options. */
+ unsigned int dynamic: 1;
+
+ /* Non-NULL if .note.gnu.build-id section should be created. */
+ char *emit_note_gnu_build_id;
+
/* What to do with unresolved symbols in an object file.
- When producing static binaries the default is GENERATE_ERROR.
- When producing dynamic binaries the default is IGNORE. The
- assumption with dynamic binaries is that the reference will be
+ When producing executables the default is GENERATE_ERROR.
+ When producing shared libraries the default is IGNORE. The
+ assumption with shared libraries is that the reference will be
resolved at load/execution time. */
enum report_method unresolved_syms_in_objects;
whether to include an object from an archive. */
enum bfd_link_common_skip_ar_aymbols common_skip_ar_aymbols;
+ /* Char that may appear as the first char of a symbol, but should be
+ skipped (like symbol_leading_char) when looking up symbols in
+ wrap_hash. Used by PowerPC Linux for 'dot' symbols. */
+ char wrap_char;
+
+ /* Separator between archive and filename in linker script filespecs. */
+ char path_separator;
+
/* Function callbacks. */
const struct bfd_link_callbacks *callbacks;
option). If this is NULL, no symbols are being wrapped. */
struct bfd_hash_table *wrap_hash;
+ /* The output BFD. */
+ bfd *output_bfd;
+
/* The list of input BFD's involved in the link. These are chained
together via the link_next field. */
bfd *input_bfds;
+ bfd **input_bfds_tail;
/* If a symbol should be created for each input BFD, this is section
where those symbols should be placed. It must be a section in
unloaded. */
const char *fini_function;
+ /* Number of relaxation passes. Usually only one relaxation pass
+ is needed. But a backend can have as many relaxation passes as
+ necessary. During bfd_relax_section call, it is set to the
+ current pass, starting from 0. */
+ int relax_pass;
+
+ /* Number of relaxation trips. This number is incremented every
+ time the relaxation pass is restarted due to a previous
+ relaxation returning true in *AGAIN. */
+ int relax_trip;
+
/* Non-zero if auto-import thunks for DATA items in pei386 DLLs
should be generated/linked against. Set to 1 if this feature
is explicitly requested by the user, -1 if enabled by default. */
/* May be used to set DT_FLAGS_1 for ELF. */
bfd_vma flags_1;
+
+ /* Start and end of RELRO region. */
+ bfd_vma relro_start, relro_end;
+
+ /* List of symbols should be dynamic. */
+ struct bfd_elf_dynamic_list *dynamic_list;
};
-/* This structures holds a set of callback functions. These are
- called by the BFD linker routines. The first argument to each
- callback function is the bfd_link_info structure being used. Each
- function returns a boolean value. If the function returns FALSE,
- then the BFD function which called it will return with a failure
- indication. */
+/* This structures holds a set of callback functions. These are called
+ by the BFD linker routines. Except for the info functions, the first
+ argument to each callback function is the bfd_link_info structure
+ being used and each function returns a boolean value. If the
+ function returns FALSE, then the BFD function which called it should
+ return with a failure indication. */
struct bfd_link_callbacks
{
bfd_boolean (*undefined_symbol)
(struct bfd_link_info *, const char *name, bfd *abfd,
asection *section, bfd_vma address, bfd_boolean fatal);
- /* A function which is called when a reloc overflow occurs. NAME is
- the name of the symbol or section the reloc is against,
- RELOC_NAME is the name of the relocation, and ADDEND is any
- addend that is used. ABFD, SECTION and ADDRESS identify the
+ /* A function which is called when a reloc overflow occurs. ENTRY is
+ the link hash table entry for the symbol the reloc is against.
+ NAME is the name of the local symbol or section the reloc is
+ against, RELOC_NAME is the name of the relocation, and ADDEND is
+ any addend that is used. ABFD, SECTION and ADDRESS identify the
location at which the overflow occurs; if this is the result of a
bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then
ABFD will be NULL. */
bfd_boolean (*reloc_overflow)
- (struct bfd_link_info *, const char *name, const char *reloc_name,
- bfd_vma addend, bfd *abfd, asection *section, bfd_vma address);
+ (struct bfd_link_info *, struct bfd_link_hash_entry *entry,
+ const char *name, const char *reloc_name, bfd_vma addend,
+ bfd *abfd, asection *section, bfd_vma address);
/* A function which is called when a dangerous reloc is performed.
- The canonical example is an a29k IHCONST reloc which does not
- follow an IHIHALF reloc. MESSAGE is an appropriate message.
+ MESSAGE is an appropriate message.
ABFD, SECTION and ADDRESS identify the location at which the
problem occurred; if this is the result of a
bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then
bfd_boolean (*notice)
(struct bfd_link_info *, const char *name,
bfd *abfd, asection *section, bfd_vma address);
- /* A function which is called for reporting a linker error. ID is the
- error identifier. The remaining input is the same as einfo () in
- ld. */
- bfd_boolean (*error_handler)
- (int id, const char *fmt, ...);
-
-/* Identifiers of linker error messages used by error_handler. */
-#define LD_DEFINITION_IN_DISCARDED_SECTION 1
+ /* Error or warning link info message. */
+ void (*einfo)
+ (const char *fmt, ...);
+ /* General link info message. */
+ void (*info)
+ (const char *fmt, ...);
+ /* Message to be printed in linker map file. */
+ void (*minfo)
+ (const char *fmt, ...);
+ /* This callback provides a chance for users of the BFD library to
+ override its decision about whether to place two adjacent sections
+ into the same segment. */
+ bfd_boolean (*override_segment_assignment)
+ (struct bfd_link_info *, bfd * abfd,
+ asection * current_section, asection * previous_section,
+ bfd_boolean new_segment);
};
\f
/* The linker builds link_order structures which tell the code how to
};
/* This is the link_order structure itself. These form a chain
- attached to the section whose contents they are describing. */
+ attached to the output section whose contents they are describing. */
struct bfd_link_order
{
/* Section to include. If this is used, then
section->output_section must be the section the
link_order is attached to, section->output_offset must
- equal the link_order offset field, and section->_raw_size
+ equal the link_order offset field, and section->size
must equal the link_order size field. Maybe these
restrictions should be relaxed someday. */
asection *section;
struct bfd_elf_version_expr *next;
/* Glob pattern. */
const char *pattern;
- /* NULL for a glob pattern, otherwise a straight symbol. */
- const char *symbol;
+ /* Set if pattern is not a glob. */
+ unsigned int literal : 1;
/* Defined by ".symver". */
unsigned int symver : 1;
/* Defined by version script. */
struct bfd_elf_version_expr *prev, const char *sym);
};
+struct bfd_elf_dynamic_list
+{
+ struct bfd_elf_version_expr_head head;
+ struct bfd_elf_version_expr *(*match)
+ (struct bfd_elf_version_expr_head *head,
+ struct bfd_elf_version_expr *prev, const char *sym);
+};
+
#endif
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