X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=include%2Fbfdlink.h;h=716343338302708f0331289fe526fe9aef67a32c;hb=43327b208ec6452c1a6accd40be965cdfa5c86a3;hp=56ab03872baa958a232a575f1082b44e4b559d56;hpb=a6a4679fc0ad12e99e0d8374752ecce9ef097ec2;p=deliverable%2Fbinutils-gdb.git diff --git a/include/bfdlink.h b/include/bfdlink.h index 56ab03872b..7163433383 100644 --- a/include/bfdlink.h +++ b/include/bfdlink.h @@ -1,5 +1,5 @@ /* bfdlink.h -- header file for BFD link routines - Copyright (C) 1993-2016 Free Software Foundation, Inc. + Copyright (C) 1993-2020 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. @@ -42,6 +42,12 @@ enum bfd_link_discard discard_all /* Discard all locals. */ }; +enum notice_asneeded_action { + notice_as_needed, + notice_not_needed, + notice_needed +}; + /* Whether to generate ELF common symbols with the STT_COMMON type during a relocatable link. */ enum bfd_link_elf_stt_common @@ -100,14 +106,26 @@ struct bfd_link_hash_entry /* Type of this entry. */ ENUM_BITFIELD (bfd_link_hash_type) type : 8; - /* Symbol is referenced in a normal object file, as distict from a LTO - IR object file. */ - unsigned int non_ir_ref : 1; + /* Symbol is referenced in a normal regular object file, + as distinct from a LTO IR object file. */ + unsigned int non_ir_ref_regular : 1; + + /* Symbol is referenced in a normal dynamic object file, + as distinct from a LTO IR object file. */ + unsigned int non_ir_ref_dynamic : 1; /* Symbol is a built-in define. These will be overridden by PROVIDE in a linker script. */ unsigned int linker_def : 1; + /* Symbol defined in a linker script. */ + unsigned int ldscript_def : 1; + + /* Symbol will be converted from absolute to section-relative. Set for + symbols defined by a script from "dot" (also SEGMENT_START or ORIGIN) + outside of an output section statement. */ + unsigned int rel_from_abs : 1; + /* A union of information depending upon the type. */ union { @@ -137,9 +155,6 @@ struct bfd_link_hash_entry struct bfd_link_hash_entry *next; /* BFD symbol was found in. */ bfd *abfd; - /* For __start_ and __stop_ symbols, the first - input section matching the name. */ - asection *section; } undef; /* bfd_link_hash_defined, bfd_link_hash_defweak. */ struct @@ -255,10 +270,21 @@ enum report_method allowed to set the value. */ RM_NOT_YET_SET = 0, RM_IGNORE, - RM_GENERATE_WARNING, - RM_GENERATE_ERROR + RM_DIAGNOSE, +}; + +/* How to handle DT_TEXTREL. */ + +enum textrel_check_method +{ + textrel_check_none, + textrel_check_warning, + textrel_check_error }; +#define bfd_link_textrel_check(info) \ + (info->textrel_check != textrel_check_none) + typedef enum {with_flags, without_flags} flag_type; /* A section flag list. */ @@ -325,6 +351,9 @@ struct bfd_link_info /* TRUE if unreferenced sections should be removed. */ unsigned int gc_sections: 1; + /* TRUE if exported symbols should be kept during section gc. */ + unsigned int gc_keep_exported: 1; + /* TRUE if every symbol should be reported back via the notice callback. */ unsigned int notice_all: 1; @@ -338,6 +367,13 @@ struct bfd_link_info /* TRUE if all data symbols should be dynamic. */ unsigned int dynamic_data: 1; + /* TRUE if section groups should be resolved. */ + unsigned int resolve_section_groups: 1; + + /* Set if output file is big-endian, or if that is unknown, from + the command line or first input file endianness. */ + unsigned int big_endian : 1; + /* Which symbols to strip. */ ENUM_BITFIELD (bfd_link_strip) strip : 2; @@ -348,7 +384,7 @@ struct bfd_link_info ENUM_BITFIELD (bfd_link_elf_stt_common) elf_stt_common : 2; /* Criteria for skipping symbols when determining - whether to include an object from an archive. */ + 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. @@ -362,6 +398,9 @@ struct bfd_link_info The same defaults apply. */ ENUM_BITFIELD (report_method) unresolved_syms_in_shared_libs : 2; + /* TRUE if unresolved symbols are to be warned, rather than errored. */ + unsigned int warn_unresolved_syms: 1; + /* TRUE if shared objects should be linked directly, not shared. */ unsigned int static_link: 1; @@ -376,15 +415,15 @@ struct bfd_link_info /* TRUE if PT_GNU_RELRO segment should be created. */ unsigned int relro: 1; + /* TRUE if separate code segment should be created. */ + unsigned int separate_code: 1; + /* Nonzero if .eh_frame_hdr section and PT_GNU_EH_FRAME ELF segment should be created. 1 for DWARF2 tables, 2 for compact tables. */ unsigned int eh_frame_hdr_type: 2; - /* 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; + /* What to do with DT_TEXTREL in output. */ + ENUM_BITFIELD (textrel_check_method) textrel_check: 2; /* TRUE if .hash section should be created. */ unsigned int emit_hash: 1; @@ -426,6 +465,9 @@ struct bfd_link_info /* TRUE if ok to have multiple definition. */ unsigned int allow_multiple_definition: 1; + /* TRUE if ok to have prohibit multiple definition of absolute symbols. */ + unsigned int prohibit_multiple_definition_absolute: 1; + /* TRUE if ok to have version with no definition. */ unsigned int allow_undefined_version: 1; @@ -454,24 +496,29 @@ struct bfd_link_info /* TRUE if the linker script contained an explicit PHDRS command. */ unsigned int user_phdrs: 1; + /* TRUE if program headers ought to be loaded. */ + unsigned int load_phdrs: 1; + /* TRUE if we should check relocations after all input files have been opened. */ unsigned int check_relocs_after_open_input: 1; - /* TRUE if BND prefix in PLT entries is always generated. */ - unsigned int bndplt: 1; - /* TRUE if generation of .interp/PT_INTERP should be suppressed. */ unsigned int nointerp: 1; - /* TRUE if we shouldn't check relocation overflow. */ - unsigned int no_reloc_overflow_check: 1; + /* TRUE if common symbols should be treated as undefined. */ + unsigned int inhibit_common_definition : 1; - /* TRUE if generate a 1-byte NOP as suffix for x86 call instruction. */ - unsigned int call_nop_as_suffix : 1; + /* TRUE if "-Map map" is passed to linker. */ + unsigned int has_map_file : 1; - /* The 1-byte NOP for x86 call instruction. */ - char call_nop_byte; + /* TRUE if "--enable-non-contiguous-regions" is passed to the + linker. */ + unsigned int non_contiguous_regions : 1; + + /* TRUE if "--enable-non-contiguous-regions-warnings" is passed to + the linker. */ + unsigned int non_contiguous_regions_warnings : 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 @@ -495,10 +542,10 @@ struct bfd_link_info 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). @@ -532,6 +579,9 @@ struct bfd_link_info /* The output BFD. */ bfd *output_bfd; + /* The import library generated. */ + bfd *out_implib_bfd; + /* The list of input BFD's involved in the link. These are chained together via the link.next field. */ bfd *input_bfds; @@ -575,8 +625,9 @@ struct bfd_link_info backend to decide. */ int extern_protected_data; - /* > 0 to treat undefined weak symbol in the executable as dynamic, - requiring dynamic relocation. */ + /* 1 to make undefined weak symbols dynamic when building a dynamic + object. 0 to resolve undefined weak symbols to zero. -1 to let + the backend decide. */ int dynamic_undefined_weak; /* Non-zero if auto-import thunks for DATA items in pei386 DLLs @@ -598,6 +649,9 @@ struct bfd_link_info /* May be used to set DT_FLAGS_1 for ELF. */ bfd_vma flags_1; + /* May be used to set ELF visibility for __start_* / __stop_. */ + unsigned int start_stop_visibility; + /* Start and end of RELRO region. */ bfd_vma relro_start, relro_end; @@ -608,12 +662,13 @@ struct bfd_link_info struct bfd_elf_version_tree *version_info; }; +/* Some forward-definitions used by some callbacks. */ + +struct elf_strtab_hash; +struct elf_sym_strtab; + /* 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. */ + by the BFD linker routines. */ struct bfd_link_callbacks { @@ -622,14 +677,15 @@ struct bfd_link_callbacks 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. */ + original BFD's symbols. Returns TRUE if the object should be + added, FALSE if it should be skipped. */ 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) + void (*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 @@ -638,7 +694,7 @@ struct bfd_link_callbacks 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) + void (*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 @@ -647,7 +703,7 @@ struct bfd_link_callbacks 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) + void (*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 @@ -656,7 +712,7 @@ struct bfd_link_callbacks 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) + void (*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 @@ -666,7 +722,7 @@ struct bfd_link_callbacks 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) + void (*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 @@ -674,7 +730,7 @@ struct bfd_link_callbacks 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) + void (*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 @@ -685,7 +741,7 @@ struct bfd_link_callbacks 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) + void (*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); @@ -695,7 +751,7 @@ struct bfd_link_callbacks 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) + void (*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 @@ -704,7 +760,7 @@ struct bfd_link_callbacks 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) + void (*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 @@ -732,6 +788,16 @@ struct bfd_link_callbacks (struct bfd_link_info *, bfd * abfd, asection * current_section, asection * previous_section, bfd_boolean new_segment); + /* This callback provides a chance for callers of the BFD to examine the + ELF string table and symbol table once they are complete and indexes and + offsets assigned. */ + void (*examine_strtab) + (struct elf_sym_strtab *syms, bfd_size_type symcount, + struct elf_strtab_hash *symstrtab); + /* This callback should emit the CTF section into a non-loadable section in + the output BFD named .ctf or a name beginning with ".ctf.". */ + void (*emit_ctf) + (void); }; /* The linker builds link_order structures which tell the code how to @@ -757,9 +823,9 @@ struct bfd_link_order struct bfd_link_order *next; /* Type of link_order. */ enum bfd_link_order_type type; - /* Offset within output section. */ + /* Offset within output section in bytes. */ bfd_vma offset; - /* Size within output section. */ + /* Size within output section in octets. */ bfd_size_type size; /* Type specific information. */ union @@ -833,6 +899,20 @@ struct bfd_link_order_reloc /* Allocate a new link_order for a section. */ extern struct bfd_link_order *bfd_new_link_order (bfd *, asection *); +struct bfd_section_already_linked; + +extern bfd_boolean bfd_section_already_linked_table_init (void); +extern void bfd_section_already_linked_table_free (void); +extern bfd_boolean _bfd_handle_already_linked + (struct bfd_section *, struct bfd_section_already_linked *, + struct bfd_link_info *); + +extern struct bfd_section *_bfd_nearby_section + (bfd *, struct bfd_section *, bfd_vma); + +extern void _bfd_fix_excluded_sec_syms + (bfd *, struct bfd_link_info *); + /* 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