diff options
Diffstat (limited to 'include/bfdlink.h')
| -rw-r--r-- | include/bfdlink.h | 638 |
1 files changed, 0 insertions, 638 deletions
diff --git a/include/bfdlink.h b/include/bfdlink.h deleted file mode 100644 index c258262..0000000 --- a/include/bfdlink.h +++ /dev/null @@ -1,638 +0,0 @@ -/* bfdlink.h -- header file for BFD link routines - Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002 - 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_sec_merge, /* Discard local temporary symbols in SEC_MERGE - sections. */ - discard_none, /* Don't discard any locals. */ - 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 - }; - -/* 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. */ -}; - -enum bfd_link_common_skip_ar_aymbols -{ - bfd_link_common_skip_none, - bfd_link_common_skip_text, - bfd_link_common_skip_data, - bfd_link_common_skip_all -}; - -/* 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; - /* 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 - 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 *, bfd_boolean create, - bfd_boolean copy, bfd_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 *, bfd_boolean, - bfd_boolean, bfd_boolean)); - -/* Traverse a link hash table. */ -extern void bfd_link_hash_traverse - PARAMS ((struct bfd_link_hash_table *, - bfd_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 *)); - -struct bfd_sym_chain -{ - struct bfd_sym_chain *next; - const char *name; -}; - -/* This structure holds all the information needed to communicate - between BFD and the linker when doing a link. */ - -struct bfd_link_info -{ - /* TRUE if BFD should generate a relocatable object file. */ - unsigned int relocateable: 1; - - /* TRUE if BFD should generate relocation information in the final - executable. */ - unsigned int emitrelocations: 1; - - /* TRUE if BFD should generate a "task linked" object file, - similar to relocatable but also with globals converted to - statics. */ - unsigned int task_link: 1; - - /* TRUE if BFD should generate a shared object. */ - unsigned int shared: 1; - - /* TRUE if BFD should pre-bind symbols in a shared object. */ - unsigned int symbolic: 1; - - /* TRUE if BFD should export all symbols in the dynamic symbol table - of an executable, rather than only those used. */ - unsigned int export_dynamic: 1; - - /* TRUE if shared objects should be linked directly, not shared. */ - unsigned int static_link: 1; - - /* 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. */ - unsigned int traditional_format: 1; - - /* TRUE if we want to produced optimized output files. This might - need much more time and therefore must be explicitly selected. */ - unsigned int optimize: 1; - - /* TRUE if BFD should generate errors for undefined symbols - even if generating a shared object. */ - unsigned int no_undefined: 1; - - /* 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. */ - unsigned int allow_shlib_undefined: 1; - - /* TRUE if ok to have multiple definition. */ - unsigned int allow_multiple_definition: 1; - - /* TRUE if ok to have version with no definition. */ - unsigned int allow_undefined_version: 1; - - /* TRUE if symbols should be retained in memory, FALSE if they - should be freed and reread. */ - unsigned int keep_memory: 1; - - /* TRUE if every symbol should be reported back via the notice - callback. */ - unsigned int notice_all: 1; - - /* TRUE if executable should not contain copy relocs. - Setting this true may result in a non-sharable text segment. */ - unsigned int nocopyreloc: 1; - - /* TRUE if the new ELF dynamic tags are enabled. */ - unsigned int new_dtags: 1; - - /* TRUE if non-PLT relocs should be merged into one reloc section - and sorted so that relocs against the same symbol come together. */ - unsigned int combreloc: 1; - - /* TRUE if .eh_frame_hdr section and PT_GNU_EH_FRAME ELF segment - should be created. */ - unsigned int eh_frame_hdr: 1; - - /* TRUE if global symbols in discarded sections should be stripped. */ - unsigned int strip_discarded: 1; - - /* Which symbols to strip. */ - enum bfd_link_strip strip; - - /* Which local symbols to discard. */ - enum bfd_link_discard discard; - - /* Criteria for skipping symbols when detemining - whether to include an object from an archive. */ - enum bfd_link_common_skip_ar_aymbols common_skip_ar_aymbols; - - /* Function callbacks. */ - const struct bfd_link_callbacks *callbacks; - - /* 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; - - /* 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; - - /* 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; - - /* List of global symbol names that are starting points for marking - sections against garbage collection. */ - struct bfd_sym_chain *gc_sym_list; - - /* If a base output file is wanted, then this points to it */ - PTR base_file; - - /* 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; - - /* 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; - - /* 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. */ - int pei386_auto_import; - - /* Non-zero if runtime relocs for DATA items with non-zero addends - in pei386 DLLs should be generated. Set to 1 if this feature - is explicitly requested by the user, -1 if enabled by default. */ - int pei386_runtime_pseudo_reloc; - - /* How many spare .dynamic DT_NULL entries should be added? */ - unsigned int spare_dynamic_tags; - - /* 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. */ - bfd_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. */ - bfd_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. */ - bfd_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. */ - bfd_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. */ - bfd_boolean (*constructor) - PARAMS ((struct bfd_link_info *, bfd_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. */ - bfd_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. */ - bfd_boolean (*undefined_symbol) - PARAMS ((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 - 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) - 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. */ - bfd_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. */ - bfd_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. */ - bfd_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_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 - { - /* Size of contents, or zero when contents size == size - within output section. - A non-zero value allows filling of the output section - with an arbitrary repeated pattern. */ - unsigned int size; - /* Data to put into file. */ - 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 *)); - /* Defined by ".symver". */ - unsigned int symver: 1; - /* Defined by version script. */ - unsigned int script : 1; -}; - -/* 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 |