/* 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.
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
/* 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
{
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. */
+ /* BFD symbol was found in. */
+ bfd *abfd;
} 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. */
+ /* Symbol section. */
+ asection *section;
+ /* Symbol value. */
+ bfd_vma 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). */
+ /* Real symbol. */
+ struct bfd_link_hash_entry *link;
+ /* Warning message (bfd_link_hash_warning only). */
+ const char *warning;
} i;
/* bfd_link_hash_common. */
struct
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. */
+ /* Common symbol size. */
+ bfd_size_type size;
} c;
} u;
};
/* Read symbols and cache symbol pointer array in outsymbols. */
extern bfd_boolean bfd_generic_link_read_symbols (bfd *);
+/* Check the relocs in the BFD. Called after all the input
+ files have been loaded, and garbage collection has tagged
+ any unneeded sections. */
+extern bfd_boolean bfd_link_check_relocs (bfd *,struct bfd_link_info *);
+
struct bfd_sym_chain
{
struct bfd_sym_chain *next;
/* 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;
/* 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;
/* 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 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;
/* TRUE if the linker script contained an explicit PHDRS command. */
unsigned int user_phdrs: 1;
- /* TRUE if BND prefix in PLT entries is always generated. */
- unsigned int bndplt: 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 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 generate a 1-byte NOP as suffix for x86 call instruction. */
- unsigned int call_nop_as_suffix : 1;
+ /* TRUE if common symbols should be treated as undefined. */
+ unsigned int inhibit_common_definition : 1;
- /* The 1-byte NOP for x86 call instruction. */
- char call_nop_byte;
+ /* TRUE if "-Map map" is passed to linker. */
+ unsigned int has_map_file : 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
/* 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;
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
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
{
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
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
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
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
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
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
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);
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
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
(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);
};
\f
/* The linker builds link_order structures which tell the code how to
/* 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
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