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-/* bfdlink.h -- header file for BFD link routines
- Copyright 1993, 94, 95, 96, 97, 1999 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
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-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. */
-
-#ifndef BFDLINK_H
-#define BFDLINK_H
-
-/* Which symbols to strip during a link. */
-enum bfd_link_strip
-{
- strip_none, /* Don't strip any symbols. */
- strip_debugger, /* Strip debugging symbols. */
- strip_some, /* keep_hash is the list of symbols to keep. */
- strip_all /* Strip all symbols. */
-};
-
-/* Which local symbols to discard during a link. This is irrelevant
- if strip_all is used. */
-enum bfd_link_discard
-{
- discard_none, /* Don't discard any locals. */
- discard_l, /* Discard local temporary symbols. */
- discard_all /* Discard all locals. */
-};
-
-/* These are the possible types of an entry in the BFD link hash
- table. */
-
-enum bfd_link_hash_type
-{
- bfd_link_hash_new, /* Symbol is new. */
- bfd_link_hash_undefined, /* Symbol seen before, but 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. */
-};
-
-/* The linking routines use a hash table which uses this structure for
- its elements. */
-
-struct bfd_link_hash_entry
-{
- /* Base hash table entry structure. */
- struct bfd_hash_entry root;
- /* 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 *next;
- /* A union of information depending upon the type. */
- union
- {
- /* Nothing is kept for bfd_hash_new. */
- /* bfd_link_hash_undefined, bfd_link_hash_undefweak. */
- struct
- {
- bfd *abfd; /* BFD symbol was found in. */
- } undef;
- /* bfd_link_hash_defined, bfd_link_hash_defweak. */
- struct
- {
- bfd_vma value; /* Symbol value. */
- asection *section; /* Symbol section. */
- } def;
- /* bfd_link_hash_indirect, bfd_link_hash_warning. */
- struct
- {
- struct bfd_link_hash_entry *link; /* Real symbol. */
- const char *warning; /* Warning (bfd_link_hash_warning only). */
- } i;
- /* bfd_link_hash_common. */
- struct
- {
- /* 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;
-};
-
-/* This is the link hash table. It is a derived class of
- bfd_hash_table. */
-
-struct bfd_link_hash_table
-{
- /* 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;
- /* Entries are added to the tail of the undefs list. */
- struct bfd_link_hash_entry *undefs_tail;
-};
-
-/* Look up an entry in a link hash table. If FOLLOW is true, this
- follows bfd_link_hash_indirect and bfd_link_hash_warning links to
- the real symbol. */
-extern struct bfd_link_hash_entry *bfd_link_hash_lookup
- 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 *,
- boolean (*) (struct bfd_link_hash_entry *, PTR),
- PTR));
-
-/* Add an entry to the undefs list. */
-extern void bfd_link_add_undef
- PARAMS ((struct bfd_link_hash_table *, struct bfd_link_hash_entry *));
-
-/* This structure holds all the information needed to communicate
- between BFD and the linker when doing a link. */
-
-struct bfd_link_info
-{
- /* Function callbacks. */
- 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 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;
- /* true if symbols should be retained in memory, false if they
- should be freed and reread. */
- boolean keep_memory;
- /* The list of input BFD's involved in the link. These are chained
- together via the link_next field. */
- bfd *input_bfds;
- /* 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
- the output BFD. It may be NULL, in which case no such symbols
- will be created. This is to support CREATE_OBJECT_SYMBOLS in the
- linker command language. */
- asection *create_object_symbols_section;
- /* Hash table handled by BFD. */
- struct bfd_link_hash_table *hash;
- /* Hash table of symbols to keep. This is NULL unless strip is
- strip_some. */
- struct bfd_hash_table *keep_hash;
- /* 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;
-};
-
-/* 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. */
-
-struct bfd_link_callbacks
-{
- /* A function which is called when an object is added from an
- archive. ABFD is the archive element being added. NAME is the
- name of the symbol which caused the archive element to be pulled
- in. */
- boolean (*add_archive_element) PARAMS ((struct bfd_link_info *,
- bfd *abfd,
- const char *name));
- /* A function which is called when a symbol is found with multiple
- definitions. NAME is the symbol which is defined multiple times.
- OBFD is the old BFD, OSEC is the old section, OVAL is the old
- value, NBFD is the new BFD, NSEC is the new section, and NVAL is
- the new value. OBFD may be NULL. OSEC and NSEC may be
- bfd_com_section or bfd_ind_section. */
- boolean (*multiple_definition) PARAMS ((struct bfd_link_info *,
- const char *name,
- bfd *obfd,
- asection *osec,
- bfd_vma oval,
- bfd *nbfd,
- asection *nsec,
- 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; 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,
- enum bfd_link_hash_type otype,
- bfd_vma osize,
- bfd *nbfd,
- enum bfd_link_hash_type ntype,
- bfd_vma nsize));
- /* A function which is called to add a symbol to a set. ENTRY is
- the link hash table entry for the set itself (e.g.,
- __CTOR_LIST__). RELOC is the relocation to use for an entry in
- the set when generating a relocateable file, and is also used to
- get the size of the entry when generating an executable file.
- ABFD, SEC and VALUE identify the value to add to the set. */
- boolean (*add_to_set) PARAMS ((struct bfd_link_info *,
- struct bfd_link_hash_entry *entry,
- bfd_reloc_code_real_type reloc,
- bfd *abfd, asection *sec, bfd_vma value));
- /* A function which is called when the name of a g++ constructor or
- destructor is found. This is only called by some object file
- formats. CONSTRUCTOR is true for a constructor, false for a
- destructor. This will use BFD_RELOC_CTOR when generating a
- relocateable file. NAME is the name of the symbol found. ABFD,
- SECTION and VALUE are the value of the symbol. */
- boolean (*constructor) PARAMS ((struct bfd_link_info *,
- boolean constructor,
- const char *name, bfd *abfd, asection *sec,
- bfd_vma value));
- /* 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 *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. 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,
- 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
- 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. */
- boolean (*reloc_overflow) PARAMS ((struct bfd_link_info *,
- 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.
- 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
- ABFD will be NULL. */
- boolean (*reloc_dangerous) PARAMS ((struct bfd_link_info *,
- const char *message,
- bfd *abfd, asection *section,
- bfd_vma address));
- /* A function which is called when a reloc is found to be attached
- to a symbol which is not being written out. NAME is the name of
- the symbol. ABFD, SECTION and ADDRESS identify the location of
- the reloc; if this is the result of a
- bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then
- ABFD will be NULL. */
- boolean (*unattached_reloc) PARAMS ((struct bfd_link_info *,
- const char *name,
- bfd *abfd, asection *section,
- bfd_vma address));
- /* A function which is called when a symbol in notice_hash is
- defined or referenced. NAME is the symbol. ABFD, SECTION and
- ADDRESS are the value of the symbol. If SECTION is
- bfd_und_section, this is a reference. */
- boolean (*notice) PARAMS ((struct bfd_link_info *, const char *name,
- bfd *abfd, asection *section, bfd_vma address));
-};
-
-/* The linker builds link_order structures which tell the code how to
- include input data in the output file. */
-
-/* These are the types of link_order structures. */
-
-enum bfd_link_order_type
-{
- 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. */
-};
-
-/* This is the link_order structure itself. These form a chain
- attached to the section whose contents they are describing. */
-
-struct bfd_link_order
-{
- /* Next link_order in chain. */
- struct bfd_link_order *next;
- /* Type of link_order. */
- enum bfd_link_order_type type;
- /* Offset within output section. */
- bfd_vma offset;
- /* Size within output section. */
- bfd_size_type size;
- /* Type specific information. */
- union
- {
- struct
- {
- /* 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
- must equal the link_order size field. Maybe these
- restrictions should be relaxed someday. */
- asection *section;
- } indirect;
- struct
- {
- /* 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
- bfd_section_reloc_link_order and
- bfd_symbol_reloc_link_order. */
- struct bfd_link_order_reloc *p;
- } reloc;
- } u;
-};
-
-/* A linker order of type bfd_section_reloc_link_order or
- bfd_symbol_reloc_link_order means to create a reloc against a
- section or symbol, respectively. This is used to implement -Ur to
- generate relocs for the constructor tables. The
- bfd_link_order_reloc structure describes the reloc that BFD should
- create. It is similar to a arelent, but I didn't use arelent
- because the linker does not know anything about most symbols, and
- any asymbol structure it creates will be partially meaningless.
- This information could logically be in the bfd_link_order struct,
- but I didn't want to waste the space since these types of relocs
- are relatively rare. */
-
-struct bfd_link_order_reloc
-{
- /* Reloc type. */
- bfd_reloc_code_real_type reloc;
-
- union
- {
- /* For type bfd_section_reloc_link_order, this is the section
- the reloc should be against. This must be a section in the
- output BFD, not any of the input BFDs. */
- asection *section;
- /* For type bfd_symbol_reloc_link_order, this is the name of the
- symbol the reloc should be against. */
- const char *name;
- } u;
-
- /* Addend to use. The object file should contain zero. The BFD
- backend is responsible for filling in the contents of the object
- file correctly. For some object file formats (e.g., COFF) the
- addend must be stored into in the object file, and for some
- (e.g., SPARC a.out) it is kept in the reloc. */
- bfd_vma addend;
-};
-
-/* 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