/* bfdlink.h -- header file for BFD link routines
- Copyright 1993 Free Software Foundation, Inc.
+ Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000
+ 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.
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. */
#ifndef BFDLINK_H
#define BFDLINK_H
if strip_all is used. */
enum bfd_link_discard
{
+ discard_sec_merge, /* Discard local temporary symbols in SEC_MERGE
+ sections. */
discard_none, /* Don't discard any locals. */
- discard_l, /* Discard locals with a certain prefix. */
+ discard_l, /* Discard local temporary symbols. */
discard_all /* Discard all locals. */
};
+
+/* Describes the type of hash table entry structure being used.
+ Different hash table structure have different fields and so
+ support different linking features. */
+enum bfd_link_hash_table_type
+ {
+ bfd_link_generic_hash_table,
+ bfd_link_elf_hash_table
+ };
\f
/* These are the possible types of an entry in the BFD link hash
table. */
{
bfd_link_hash_new, /* Symbol is new. */
bfd_link_hash_undefined, /* Symbol seen before, but undefined. */
- bfd_link_hash_weak, /* Symbol is weak and undefined. */
+ bfd_link_hash_undefweak, /* Symbol is weak and undefined. */
bfd_link_hash_defined, /* Symbol is defined. */
+ bfd_link_hash_defweak, /* Symbol is weak and defined. */
bfd_link_hash_common, /* Symbol is common. */
bfd_link_hash_indirect, /* Symbol is an indirect link. */
bfd_link_hash_warning /* Like indirect, but warn if referenced. */
struct bfd_hash_entry root;
/* Type of this entry. */
enum bfd_link_hash_type type;
- /* Whether this symbol has been written out. */
- boolean written;
- /* Undefined and common entries are kept in a linked list through
+
+ /* 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
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. */
+ 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;
/* A union of information depending upon the type. */
union
{
/* Nothing is kept for bfd_hash_new. */
- /* bfd_link_hash_undefined, bfd_link_hash_weak. */
+ /* bfd_link_hash_undefined, bfd_link_hash_undefweak. */
struct
{
bfd *abfd; /* BFD symbol was found in. */
} undef;
- /* bfd_link_hash_defined. */
+ /* bfd_link_hash_defined, bfd_link_hash_defweak. */
struct
{
bfd_vma value; /* Symbol value. */
/* bfd_link_hash_common. */
struct
{
- bfd_vma size; /* Common symbol size. */
- asection *section; /* Symbol section. */
+ /* 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
+ here, and we allocate a small structure to hold the
+ section and the alignment. The alignment is stored as a
+ power of two. We don't store all the information
+ directly because we don't want to increase the size of
+ the union; this structure is a major space user in the
+ linker. */
+ 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;
};
type of the entries in the hash table, which is sometimes
important information when linking object files of different
types together. */
- bfd_target *creator;
+ 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;
/* Entries are added to the tail of the undefs list. */
struct bfd_link_hash_entry *undefs_tail;
+ /* The type of the ink hash table. */
+ enum bfd_link_hash_table_type type;
};
/* Look up an entry in a link hash table. If FOLLOW is true, this
PARAMS ((struct bfd_link_hash_table *, const char *, boolean create,
boolean copy, boolean follow));
+/* Look up an entry in the main linker hash table if the symbol might
+ be wrapped. This should only be used for references to an
+ undefined symbol, not for definitions of a symbol. */
+
+extern struct bfd_link_hash_entry *bfd_wrapped_link_hash_lookup
+ PARAMS ((bfd *, struct bfd_link_info *, const char *, boolean, boolean,
+ boolean));
+
/* Traverse a link hash table. */
extern void bfd_link_hash_traverse
PARAMS ((struct bfd_link_hash_table *,
const struct bfd_link_callbacks *callbacks;
/* true if BFD should generate a relocateable object file. */
boolean relocateable;
+ /* true if BFD should generate relocation information in the final executable. */
+ boolean emitrelocations;
+ /* true if BFD should generate a "task linked" object file,
+ similar to relocatable but also with globals converted to statics. */
+ boolean task_link;
+ /* true if BFD should generate a shared object. */
+ boolean shared;
+ /* true if BFD should pre-bind symbols in a shared object. */
+ boolean symbolic;
+ /* true if BFD should export all symbols in the dynamic symbol table
+ of an executable, rather than only those used. */
+ boolean export_dynamic;
+ /* true if shared objects should be linked directly, not shared. */
+ boolean static_link;
+ /* true if the output file should be in a traditional format. This
+ is equivalent to the setting of the BFD_TRADITIONAL_FORMAT flag
+ on the output file, but may be checked when reading the input
+ files. */
+ boolean traditional_format;
+ /* true if we want to produced optimized output files. This might
+ need much more time and therefore must be explicitly selected. */
+ boolean optimize;
+ /* true if BFD should generate errors for undefined symbols
+ even if generating a shared object. */
+ boolean no_undefined;
+ /* true if BFD should allow undefined symbols in shared objects even
+ when no_undefined is set to disallow undefined symbols. The net
+ result will be that undefined symbols in regular objects will
+ still trigger an error, but undefined symbols in shared objects
+ will be ignored. The implementation of no_undefined makes the
+ assumption that the runtime linker will choke on undefined
+ symbols. However there is at least one system (BeOS) where
+ undefined symbols in shared libraries is normal since the kernel
+ patches them at load time to select which function is most
+ appropriate for the current architecture. I.E. dynamically
+ select an appropriate memset function. Apparently it is also
+ normal for HPPA shared libraries to have undefined symbols. */
+ boolean allow_shlib_undefined;
/* Which symbols to strip. */
enum bfd_link_strip strip;
/* Which local symbols to discard. */
enum bfd_link_discard discard;
- /* The local symbol prefix to discard if using discard_l. */
- unsigned int lprefix_len;
- const char *lprefix;
/* true if symbols should be retained in memory, false if they
should be freed and reread. */
boolean keep_memory;
/* Hash table of symbols to keep. This is NULL unless strip is
strip_some. */
struct bfd_hash_table *keep_hash;
- /* Hash table of symbols to report back via notice_callback. If
- this is NULL no symbols are reported back. */
+ /* true if every symbol should be reported back via the notice
+ callback. */
+ boolean notice_all;
+ /* Hash table of symbols to report back via the notice callback. If
+ this is NULL, and notice_all is false, then no symbols are
+ reported back. */
struct bfd_hash_table *notice_hash;
+ /* Hash table of symbols which are being wrapped (the --wrap linker
+ option). If this is NULL, no symbols are being wrapped. */
+ struct bfd_hash_table *wrap_hash;
+ /* If a base output file is wanted, then this points to it */
+ PTR base_file;
+
+ /* If non-zero, specifies that branches which are problematic for the
+ MPC860 C0 (or earlier) should be checked for and modified. It gives the
+ number of bytes that should be checked at the end of each text page. */
+ int mpc860c0;
+
+ /* The function to call when the executable or shared object is
+ loaded. */
+ const char *init_function;
+ /* The function to call when the executable or shared object is
+ unloaded. */
+ const char *fini_function;
+
+ /* true if the new ELF dynamic tags are enabled. */
+ boolean new_dtags;
+
+ /* May be used to set DT_FLAGS for ELF. */
+ bfd_vma flags;
+
+ /* May be used to set DT_FLAGS_1 for ELF. */
+ bfd_vma flags_1;
+
+ /* True if auto-import thunks for DATA items in pei386 DLLs
+ should be generated/linked against. */
+ boolean pei386_auto_import;
+
+ /* True if non-PLT relocs should be merged into one reloc section
+ and sorted so that relocs against the same symbol come together. */
+ boolean combreloc;
+
+ /* True if executable should not contain copy relocs.
+ Setting this true may result in a non-sharable text segment. */
+ boolean nocopyreloc;
+
+ /* True if .eh_frame_hdr section and PT_GNU_EH_FRAME ELF segment
+ should be created. */
+ boolean eh_frame_hdr;
+
+ /* How many spare .dynamic DT_NULL entries should be added? */
+ unsigned int spare_dynamic_tags;
};
/* This structures holds a set of callback functions. These are
bfd_vma nval));
/* A function which is called when a common symbol is defined
multiple times. NAME is the symbol appearing multiple times.
- OBFD is the BFD of the existing symbol. OTYPE is the type of the
- existing symbol, either bfd_link_hash_defined or
- bfd_link_hash_common. If OTYPE is bfd_link_hash_common, OSIZE is
- the size of the existing symbol. NBFD is the BFD of the new
- symbol. NTYPE is the type of the new symbol, either
- bfd_link_hash_defined or bfd_link_hash_common. If NTYPE is
- bfd_link_hash_common, NSIZE is the size of the new symbol. */
+ OBFD is the BFD of the existing symbol; it may be NULL if this is
+ not known. OTYPE is the type of the existing symbol, which may
+ be bfd_link_hash_defined, bfd_link_hash_defweak,
+ bfd_link_hash_common, or bfd_link_hash_indirect. If OTYPE is
+ bfd_link_hash_common, OSIZE is the size of the existing symbol.
+ NBFD is the BFD of the new symbol. NTYPE is the type of the new
+ symbol, one of bfd_link_hash_defined, bfd_link_hash_common, or
+ bfd_link_hash_indirect. If NTYPE is bfd_link_hash_common, NSIZE
+ is the size of the new symbol. */
boolean (*multiple_common) PARAMS ((struct bfd_link_info *,
const char *name,
bfd *obfd,
boolean constructor,
const char *name, bfd *abfd, asection *sec,
bfd_vma value));
- /* A function which is called when there is a reference to a warning
- symbol. WARNING is the warning to be issued. */
+ /* A function which is called to issue a linker warning. For
+ example, this is called when there is a reference to a warning
+ symbol. WARNING is the warning to be issued. SYMBOL is the name
+ of the symbol which triggered the warning; it may be NULL if
+ there is none. ABFD, SECTION and ADDRESS identify the location
+ which trigerred the warning; either ABFD or SECTION or both may
+ be NULL if the location is not known. */
boolean (*warning) PARAMS ((struct bfd_link_info *,
- const char *warning));
+ const char *warning, const char *symbol,
+ bfd *abfd, asection *section,
+ bfd_vma address));
/* A function which is called when a relocation is attempted against
an undefined symbol. NAME is the symbol which is undefined.
ABFD, SECTION and ADDRESS identify the location from which the
- reference is made. */
+ reference is made. FATAL indicates whether an undefined symbol is
+ a fatal error or not. In some cases SECTION may be NULL. */
boolean (*undefined_symbol) PARAMS ((struct bfd_link_info *,
const char *name, bfd *abfd,
- asection *section, bfd_vma address));
+ asection *section,
+ bfd_vma address,
+ 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
bfd_undefined_link_order, /* Undefined. */
bfd_indirect_link_order, /* Built from a section. */
bfd_fill_link_order, /* Fill with a 16 bit constant. */
+ bfd_data_link_order, /* Set to explicit data. */
bfd_section_reloc_link_order, /* Relocate against a section. */
bfd_symbol_reloc_link_order /* Relocate against a symbol. */
};
/* Value to fill with. */
unsigned int value;
} fill;
+ struct
+ {
+ /* Data to put into file. The size field gives the number
+ of bytes which this field points to. */
+ bfd_byte *contents;
+ } data;
struct
{
/* Description of reloc to generate. Used for
/* Allocate a new link_order for a section. */
extern struct bfd_link_order *bfd_new_link_order PARAMS ((bfd *, asection *));
+/* These structures are used to describe version information for the
+ ELF linker. These structures could be manipulated entirely inside
+ BFD, but it would be a pain. Instead, the regular linker sets up
+ these structures, and then passes them into BFD. */
+
+/* Regular expressions for a version. */
+
+struct bfd_elf_version_expr
+{
+ /* Next regular expression for this version. */
+ struct bfd_elf_version_expr *next;
+ /* Regular expression. */
+ const char *pattern;
+ /* Matching function. */
+ int (*match) PARAMS((struct bfd_elf_version_expr *, const char *));
+};
+
+/* Version dependencies. */
+
+struct bfd_elf_version_deps
+{
+ /* Next dependency for this version. */
+ struct bfd_elf_version_deps *next;
+ /* The version which this version depends upon. */
+ struct bfd_elf_version_tree *version_needed;
+};
+
+/* A node in the version tree. */
+
+struct bfd_elf_version_tree
+{
+ /* Next version. */
+ struct bfd_elf_version_tree *next;
+ /* Name of this version. */
+ const char *name;
+ /* Version number. */
+ unsigned int vernum;
+ /* Regular expressions for global symbols in this version. */
+ struct bfd_elf_version_expr *globals;
+ /* Regular expressions for local symbols in this version. */
+ struct bfd_elf_version_expr *locals;
+ /* List of versions which this version depends upon. */
+ struct bfd_elf_version_deps *deps;
+ /* Index of the version name. This is used within BFD. */
+ unsigned int name_indx;
+ /* Whether this version tree was used. This is used within BFD. */
+ int used;
+};
+
#endif
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