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Diffstat (limited to 'binutils-2.25/include/bfdlink.h')
| -rw-r--r-- | binutils-2.25/include/bfdlink.h | 842 |
1 files changed, 842 insertions, 0 deletions
diff --git a/binutils-2.25/include/bfdlink.h b/binutils-2.25/include/bfdlink.h new file mode 100644 index 00000000..1ac07382 --- /dev/null +++ b/binutils-2.25/include/bfdlink.h @@ -0,0 +1,842 @@ +/* bfdlink.h -- header file for BFD link routines + Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, + 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 + 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 3 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., 51 Franklin Street - Fifth Floor, Boston, + MA 02110-1301, 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_symbols +{ + bfd_link_common_skip_none, + bfd_link_common_skip_text, + bfd_link_common_skip_data, + 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. */ + +struct bfd_link_hash_entry +{ + /* Base hash table entry structure. */ + struct bfd_hash_entry root; + + /* Type of this entry. */ + ENUM_BITFIELD (bfd_link_hash_type) type : 8; + + unsigned int non_ir_ref : 1; + + /* 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 + { + /* 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. */ + } undef; + /* bfd_link_hash_defined, bfd_link_hash_defweak. */ + struct + { + 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 + 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. */ + struct bfd_link_hash_common_entry *p; + bfd_size_type size; /* Common symbol size. */ + } 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; + /* 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 link 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 + (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 + (bfd *, struct bfd_link_info *, const char *, bfd_boolean, + bfd_boolean, bfd_boolean); + +/* Traverse a link hash table. */ +extern void bfd_link_hash_traverse + (struct bfd_link_hash_table *, + bfd_boolean (*) (struct bfd_link_hash_entry *, void *), + void *); + +/* Add an entry to the undefs list. */ +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; + const char *name; +}; + +/* How to handle unresolved symbols. + There are four possibilities which are enumerated below: */ +enum report_method +{ + /* This is the initial value when then link_info structure is created. + It allows the various stages of the linker to determine whether they + allowed to set the value. */ + RM_NOT_YET_SET = 0, + RM_IGNORE, + RM_GENERATE_WARNING, + RM_GENERATE_ERROR +}; + +typedef enum {with_flags, without_flags} flag_type; + +/* A section flag list. */ +struct flag_info_list +{ + flag_type with; + const char *name; + bfd_boolean valid; + struct flag_info_list *next; +}; + +/* Section flag info. */ +struct flag_info +{ + flagword only_with_flags; + flagword not_with_flags; + struct flag_info_list *flag_list; + bfd_boolean flags_initialized; +}; + +struct bfd_elf_dynamic_list; +struct bfd_elf_version_tree; + +/* 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 shared object (or a pie). */ + unsigned int shared: 1; + + /* TRUE if generating an executable, position independent or not. */ + unsigned int executable : 1; + + /* TRUE if generating a position independent executable. */ + unsigned int pie: 1; + + /* TRUE if BFD should generate a relocatable object file. */ + unsigned int relocatable: 1; + + /* TRUE if BFD should pre-bind symbols in a shared object. */ + unsigned int symbolic: 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 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 a default symbol version should be created and used for + exported symbols. */ + unsigned int create_default_symver: 1; + + /* TRUE if unreferenced sections should be removed. */ + unsigned int gc_sections: 1; + + /* TRUE if every symbol should be reported back via the notice + callback. */ + unsigned int notice_all: 1; + + /* TRUE if we are loading LTO outputs. */ + unsigned int loading_lto_outputs: 1; + + /* TRUE if global symbols in discarded sections should be stripped. */ + unsigned int strip_discarded: 1; + + /* TRUE if all data symbols should be dynamic. */ + unsigned int dynamic_data: 1; + + /* Which symbols to strip. */ + ENUM_BITFIELD (bfd_link_strip) strip : 2; + + /* Which local symbols to discard. */ + ENUM_BITFIELD (bfd_link_discard) discard : 2; + + /* Criteria for skipping symbols when determining + whether to include an object from an archive. */ + ENUM_BITFIELD (bfd_link_common_skip_ar_symbols) common_skip_ar_symbols : 2; + + /* What to do with unresolved symbols in an object file. + 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_BITFIELD (report_method) unresolved_syms_in_objects : 2; + + /* What to do with unresolved symbols in a shared library. + The same defaults apply. */ + ENUM_BITFIELD (report_method) unresolved_syms_in_shared_libs : 2; + + /* TRUE if shared objects should be linked directly, not shared. */ + unsigned int static_link: 1; + + /* TRUE if symbols should be retained in memory, FALSE if they + should be freed and reread. */ + unsigned int keep_memory: 1; + + /* TRUE if BFD should generate relocation information in the final + executable. */ + unsigned int emitrelocations: 1; + + /* TRUE if PT_GNU_RELRO segment should be created. */ + unsigned int relro: 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 we should warn when adding a DT_TEXTREL to a shared object. */ + unsigned int warn_shared_textrel: 1; + + /* TRUE if we should error when adding a DT_TEXTREL. */ + unsigned int error_textrel: 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 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 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 a default symbol version should be created and used for + imported symbols. */ + unsigned int default_imported_symver: 1; + + /* TRUE if the new ELF dynamic tags are enabled. */ + unsigned int new_dtags: 1; + + /* FALSE if .eh_frame unwind info should be generated for PLT and other + linker created sections, TRUE if it should be omitted. */ + unsigned int no_ld_generated_unwind_info: 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 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 some symbols have to be dynamic, controlled by + --dynamic-list command line options. */ + unsigned int dynamic: 1; + + /* TRUE if PT_GNU_STACK segment should be created with PF_R|PF_W|PF_X + flags. */ + unsigned int execstack: 1; + + /* TRUE if PT_GNU_STACK segment should be created with PF_R|PF_W + flags. */ + unsigned int noexecstack: 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 user should be informed of removed unreferenced sections. */ + unsigned int print_gc_sections: 1; + + /* TRUE if we should warn alternate ELF machine code. */ + unsigned int warn_alternate_em: 1; + + /* TRUE if the linker script contained an explicit PHDRS command. */ + unsigned int user_phdrs: 1; + + /* 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; + + /* Default stack size. Zero means default (often zero itself), -1 + means explicitly zero-sized. */ + bfd_signed_vma stacksize; + + /* Enable or disable target specific optimizations. + + Not all targets have optimizations to enable. + + Normally these optimizations are disabled by default but some targets + prefer to enable them by default. So this field is a tri-state variable. + The values are: + + zero: Enable the optimizations (either from --relax being specified on + the command line or the backend's before_allocation emulation function. + + positive: The user has requested that these optimizations be disabled. + (Via the --no-relax command line option). + + negative: The optimizations are disabled. (Set when initializing the + args_type structure in ldmain.c:main. */ + signed int disable_target_specific_optimizations; + + /* 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; + + /* Hash table of symbols which may be left unresolved during + a link. If this is NULL, no symbols can be left unresolved. */ + struct bfd_hash_table *ignore_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 + 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 */ + void *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; + + /* 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. */ + 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; + + /* 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; + + /* The version information. */ + struct bfd_elf_version_tree *version_info; +}; + +/* 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 +{ + /* 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. This function may set *SUBSBFD to point to an alternative + BFD from which symbols should in fact be added in place of the + original BFD's symbols. */ + bfd_boolean (*add_archive_element) + (struct bfd_link_info *, bfd *abfd, const char *name, bfd **subsbfd); + /* A function which is called when a symbol is found with multiple + definitions. H is the symbol which is defined multiple times. + NBFD is the new BFD, NSEC is the new section, and NVAL is the new + value. NSEC may be bfd_com_section or bfd_ind_section. */ + bfd_boolean (*multiple_definition) + (struct bfd_link_info *, struct bfd_link_hash_entry *h, + bfd *nbfd, asection *nsec, bfd_vma nval); + /* A function which is called when a common symbol is defined + multiple times. H is the symbol appearing multiple times. + 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) + (struct bfd_link_info *, struct bfd_link_hash_entry *h, + 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 relocatable 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) + (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 + relocatable file. NAME is the name of the symbol found. ABFD, + SECTION and VALUE are the value of the symbol. */ + bfd_boolean (*constructor) + (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) + (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. IS_FATAL indicates whether an undefined symbol is + a fatal error or not. In some cases SECTION may be NULL. */ + bfd_boolean (*undefined_symbol) + (struct bfd_link_info *, const char *name, bfd *abfd, + asection *section, bfd_vma address, bfd_boolean is_fatal); + /* 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 *, 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. + 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) + (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) + (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. H is the symbol. ABFD, SECTION and + ADDRESS are the (new) value of the symbol. If SECTION is + bfd_und_section, this is a reference. FLAGS are the symbol + BSF_* flags. STRING is the name of the symbol to indirect to if + the sym is indirect, or the warning string if a warning sym. */ + bfd_boolean (*notice) + (struct bfd_link_info *, struct bfd_link_hash_entry *h, + bfd *abfd, asection *section, bfd_vma address, flagword flags, + const char *string); + /* 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); +}; + +/* 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 output 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->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 should be filled by + the architecture-dependent fill function. + 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 (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. */ + +/* Glob pattern for a version. */ + +struct bfd_elf_version_expr +{ + /* Next glob pattern for this version. */ + struct bfd_elf_version_expr *next; + /* Glob pattern. */ + const char *pattern; + /* Set if pattern is not a glob. */ + unsigned int literal : 1; + /* Defined by ".symver". */ + unsigned int symver : 1; + /* Defined by version script. */ + unsigned int script : 1; + /* Pattern type. */ +#define BFD_ELF_VERSION_C_TYPE 1 +#define BFD_ELF_VERSION_CXX_TYPE 2 +#define BFD_ELF_VERSION_JAVA_TYPE 4 + unsigned int mask : 3; +}; + +struct bfd_elf_version_expr_head +{ + /* List of all patterns, both wildcards and non-wildcards. */ + struct bfd_elf_version_expr *list; + /* Hash table for non-wildcards. */ + void *htab; + /* Remaining patterns. */ + struct bfd_elf_version_expr *remaining; + /* What kind of pattern types are present in list (bitmask). */ + unsigned int mask; +}; + +/* 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_head globals; + /* Regular expressions for local symbols in this version. */ + struct bfd_elf_version_expr_head 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; + /* Matching hook. */ + struct bfd_elf_version_expr *(*match) + (struct bfd_elf_version_expr_head *head, + 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 |