path: root/ld/ld.h

/* ld.h -- general linker header file
   Copyright (C) 1991-2023 Free Software Foundation, Inc.

   This file is part of the GNU Binutils.

   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 LD_H
#define LD_H

#ifndef SEEK_CUR
#define SEEK_CUR 1
#endif
#ifndef SEEK_END
#define SEEK_END 2
#endif

#ifndef ENABLE_NLS
  /* The Solaris version of locale.h always includes libintl.h.  If we have
     been configured with --disable-nls then ENABLE_NLS will not be defined
     and the dummy definitions of bindtextdomain (et al) below will conflict
     with the defintions in libintl.h.  So we define these values to prevent
     the bogus inclusion of libintl.h.  */
# define _LIBINTL_H
# define _LIBGETTEXT_H
#endif
#include <locale.h>

#ifdef ENABLE_NLS
# include <libintl.h>
# define _(String) gettext (String)
# ifdef gettext_noop
#  define N_(String) gettext_noop (String)
# else
#  define N_(String) (String)
# endif
#else
# define gettext(Msgid) (Msgid)
# define dgettext(Domainname, Msgid) (Msgid)
# define dcgettext(Domainname, Msgid, Category) (Msgid)
# define ngettext(Msgid1, Msgid2, n) \
  (n == 1 ? Msgid1 : Msgid2)
# define dngettext(Domainname, Msgid1, Msgid2, n) \
  (n == 1 ? Msgid1 : Msgid2)
# define dcngettext(Domainname, Msgid1, Msgid2, n, Category) \
  (n == 1 ? Msgid1 : Msgid2)
# define textdomain(Domainname) do {} while (0)
# define bindtextdomain(Domainname, Dirname) do {} while (0)
# define _(String) (String)
# define N_(String) (String)
#endif

/* Look in this environment name for the linker to pretend to be */
#define EMULATION_ENVIRON "LDEMULATION"
/* If in there look for the strings: */

/* Look in this variable for a target format */
#define TARGET_ENVIRON "GNUTARGET"

/* Input sections which are put in a section of this name are actually
   discarded.  */
#define DISCARD_SECTION_NAME "/DISCARD/"

/* A file name list.  */
typedef struct name_list
{
  const char *name;
  struct name_list *next;
}
name_list;

typedef enum {sort_none, sort_ascending, sort_descending} sort_order;

/* A wildcard specification.  */

typedef enum
{
  none, by_name, by_alignment, by_name_alignment, by_alignment_name,
  by_none, by_init_priority
} sort_type;

extern sort_type sort_section;

struct wildcard_spec
{
  const char *name;
  struct name_list *exclude_name_list;
  struct flag_info *section_flag_list;
  size_t namelen, prefixlen, suffixlen;
  sort_type sorted;
};

struct wildcard_list
{
  struct wildcard_list *next;
  struct wildcard_spec spec;
};

#define BYTE_SIZE	(1)
#define SHORT_SIZE	(2)
#define LONG_SIZE	(4)
#define QUAD_SIZE	(8)

enum endian_enum { ENDIAN_UNSET = 0, ENDIAN_BIG, ENDIAN_LITTLE };

typedef struct
{
  /* 1 => assign space to common symbols even if `relocatable_output'.  */
  bool force_common_definition;

  /* If TRUE, build MIPS embedded PIC relocation tables in the output
     file.  */
  bool embedded_relocs;

  /* If TRUE, force generation of a file with a .exe file.  */
  bool force_exe_suffix;

  /* If TRUE, generate a cross reference report.  */
  bool cref;

  /* If TRUE (which is the default), warn about mismatched input
     files.  */
  bool warn_mismatch;

  /* Warn on attempting to open an incompatible library during a library
     search.  */
  bool warn_search_mismatch;

  /* If non-zero check section addresses, once computed,
     for overlaps.  Relocatable links only check when this is > 0.  */
  signed char check_section_addresses;

  /* If TRUE allow the linking of input files in an unknown architecture
     assuming that the user knows what they are doing.  This was the old
     behaviour of the linker.  The new default behaviour is to reject such
     input files.  */
  bool accept_unknown_input_arch;

  /* Name of the import library to generate.  */
  char *out_implib_filename;

  /* If TRUE we'll just print the default output on stdout.  */
  bool print_output_format;

  /* If set, display the target memory usage (per memory region).  */
  bool print_memory_usage;

  /* Should we force section groups to be resolved?  Controlled with
     --force-group-allocation on the command line or FORCE_GROUP_ALLOCATION
     in the linker script.  */
  bool force_group_allocation;

  /* Big or little endian as set on command line.  */
  enum endian_enum endian;

  /* Name of runtime interpreter to invoke.  */
  char *interpreter;

  /* Name to give runtime library from the -soname argument.  */
  char *soname;

  /* Runtime library search path from the -rpath argument.  */
  char *rpath;

  /* Link time runtime library search path from the -rpath-link
     argument.  */
  char *rpath_link;

  /* Name of shared object whose symbol table should be filtered with
     this shared object.  From the --filter option.  */
  char *filter_shlib;

  /* Name of shared object for whose symbol table this shared object
     is an auxiliary filter.  From the --auxiliary option.  */
  char **auxiliary_filters;

  /* A version symbol to be applied to the symbol names found in the
     .exports sections.  */
  char *version_exports_section;

  /* Default linker script.  */
  char *default_script;
} args_type;

extern args_type command_line;

typedef int token_code_type;

/* Different ways we can handle orphan sections.  */

enum orphan_handling_enum
{
  /* The classic strategy, find a suitable section to place the orphan
     into.  */
  orphan_handling_place = 0,

  /* Discard any orphan sections as though they were assign to the section
     /DISCARD/.  */
  orphan_handling_discard,

  /* Find somewhere to place the orphan section, as with
     ORPHAN_HANDLING_PLACE, but also issue a warning.  */
  orphan_handling_warn,

  /* Issue a fatal error if any orphan sections are found.  */
  orphan_handling_error,
};

typedef struct
{
  bool magic_demand_paged;
  bool make_executable;

  /* If TRUE, -shared is supported.  */
  /* ??? A better way to do this is perhaps to define this in the
     ld_emulation_xfer_struct since this is really a target dependent
     parameter.  */
  bool has_shared;

  /* If TRUE, build constructors.  */
  bool build_constructors;

  /* If TRUE, warn about any constructors.  */
  bool warn_constructors;

  /* If TRUE, warn about merging common symbols with others.  */
  bool warn_common;

  /* If TRUE, only warn once about a particular undefined symbol.  */
  bool warn_once;

  /* How should we deal with orphan sections.  */
  enum orphan_handling_enum orphan_handling;

  /* If TRUE, warn if multiple global-pointers are needed (Alpha
     only).  */
  bool warn_multiple_gp;

  /* If TRUE, warn if the starting address of an output section
     changes due to the alignment of an input section.  */
  bool warn_section_align;

  /* If TRUE, warning messages are fatal.  */
  bool fatal_warnings;

  /* If TRUE, warning and error messages are ignored.  */
  bool no_warnings;

  sort_order sort_common;

  bool text_read_only;

  bool stats;

  /* If set, orphan input sections will be mapped to separate output
     sections.  */
  bool unique_orphan_sections;

  /* If set, only search library directories explicitly selected
     on the command line.  */
  bool only_cmd_line_lib_dirs;

  /* If set, numbers and absolute symbols are simply treated as
     numbers everywhere.  */
  bool sane_expr;

  /* If set, code and non-code sections should never be in one segment.  */
  bool separate_code;

  /* The rpath separation character.  Usually ':'.  */
  char rpath_separator;

  char *map_filename;
  FILE *map_file;

  char *dependency_file;

  unsigned int split_by_reloc;
  bfd_size_type split_by_file;

  /* The size of the hash table to use.  */
  unsigned long hash_table_size;

  /* If set, print discarded sections in map file output.  */
  bool print_map_discarded;

  /* If set, print local symbols in map file output.  */
  bool print_map_locals;

  /* If set, emit the names and types of statically-linked variables
     into the CTF.  */
  bool ctf_variables;

  /* If set, share only duplicated types in CTF, rather than sharing
     all types that are not in conflict.  */
  bool ctf_share_duplicated;

  /* Compress DWARF debug sections.  */
  enum compressed_debug_section_type compress_debug;
} ld_config_type;

extern ld_config_type config;

extern FILE * saved_script_handle;
extern bool force_make_executable;

extern int yyparse (void);
extern void add_cref (const char *, bfd *, asection *, bfd_vma);
extern bool handle_asneeded_cref (bfd *, enum notice_asneeded_action);
extern void output_cref (FILE *);
extern void check_nocrossrefs (void);
extern void ld_abort (const char *, int, const char *) ATTRIBUTE_NORETURN;

/* If gcc >= 2.6, we can give a function name, too.  */
#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 6)
#define __PRETTY_FUNCTION__  NULL
#endif

#undef abort
#define abort() ld_abort (__FILE__, __LINE__, __PRETTY_FUNCTION__)

#endif