ld/ld.h

   1 /* ld.h -- general linker header file
   2    Copyright (C) 1991-2021 Free Software Foundation, Inc.
   3
   4    This file is part of the GNU Binutils.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  19    MA 02110-1301, USA.  */
  20
  21 #ifndef LD_H
  22 #define LD_H
  23
  24 #ifndef SEEK_CUR
  25 #define SEEK_CUR 1
  26 #endif
  27 #ifndef SEEK_END
  28 #define SEEK_END 2
  29 #endif
  30
  31 #ifndef ENABLE_NLS
  32   /* The Solaris version of locale.h always includes libintl.h.  If we have
  33      been configured with --disable-nls then ENABLE_NLS will not be defined
  34      and the dummy definitions of bindtextdomain (et al) below will conflict
  35      with the defintions in libintl.h.  So we define these values to prevent
  36      the bogus inclusion of libintl.h.  */
  37 # define _LIBINTL_H
  38 # define _LIBGETTEXT_H
  39 #endif
  40 #include <locale.h>
  41
  42 #ifdef ENABLE_NLS
  43 # include <libintl.h>
  44 # define _(String) gettext (String)
  45 # ifdef gettext_noop
  46 #  define N_(String) gettext_noop (String)
  47 # else
  48 #  define N_(String) (String)
  49 # endif
  50 #else
  51 # define gettext(Msgid) (Msgid)
  52 # define dgettext(Domainname, Msgid) (Msgid)
  53 # define dcgettext(Domainname, Msgid, Category) (Msgid)
  54 # define ngettext(Msgid1, Msgid2, n) \
  55   (n == 1 ? Msgid1 : Msgid2)
  56 # define dngettext(Domainname, Msgid1, Msgid2, n) \
  57   (n == 1 ? Msgid1 : Msgid2)
  58 # define dcngettext(Domainname, Msgid1, Msgid2, n, Category) \
  59   (n == 1 ? Msgid1 : Msgid2)
  60 # define textdomain(Domainname) do {} while (0)
  61 # define bindtextdomain(Domainname, Dirname) do {} while (0)
  62 # define _(String) (String)
  63 # define N_(String) (String)
  64 #endif
  65
  66 /* Look in this environment name for the linker to pretend to be */
  67 #define EMULATION_ENVIRON "LDEMULATION"
  68 /* If in there look for the strings: */
  69
  70 /* Look in this variable for a target format */
  71 #define TARGET_ENVIRON "GNUTARGET"
  72
  73 /* Input sections which are put in a section of this name are actually
  74    discarded.  */
  75 #define DISCARD_SECTION_NAME "/DISCARD/"
  76
  77 /* A file name list.  */
  78 typedef struct name_list
  79 {
  80   const char *name;
  81   struct name_list *next;
  82 }
  83 name_list;
  84
  85 typedef enum {sort_none, sort_ascending, sort_descending} sort_order;
  86
  87 /* A wildcard specification.  */
  88
  89 typedef enum
  90 {
  91   none, by_name, by_alignment, by_name_alignment, by_alignment_name,
  92   by_none, by_init_priority
  93 } sort_type;
  94
  95 extern sort_type sort_section;
  96
  97 struct wildcard_spec
  98 {
  99   const char *name;
 100   struct name_list *exclude_name_list;
 101   sort_type sorted;
 102   struct flag_info *section_flag_list;
 103 };
 104
 105 struct wildcard_list
 106 {
 107   struct wildcard_list *next;
 108   struct wildcard_spec spec;
 109 };
 110
 111 #define BYTE_SIZE       (1)
 112 #define SHORT_SIZE      (2)
 113 #define LONG_SIZE       (4)
 114 #define QUAD_SIZE       (8)
 115
 116 enum endian_enum { ENDIAN_UNSET = 0, ENDIAN_BIG, ENDIAN_LITTLE };
 117
 118 typedef struct
 119 {
 120   /* 1 => assign space to common symbols even if `relocatable_output'.  */
 121   bool force_common_definition;
 122
 123   /* If TRUE, build MIPS embedded PIC relocation tables in the output
 124      file.  */
 125   bool embedded_relocs;
 126
 127   /* If TRUE, force generation of a file with a .exe file.  */
 128   bool force_exe_suffix;
 129
 130   /* If TRUE, generate a cross reference report.  */
 131   bool cref;
 132
 133   /* If TRUE (which is the default), warn about mismatched input
 134      files.  */
 135   bool warn_mismatch;
 136
 137   /* Warn on attempting to open an incompatible library during a library
 138      search.  */
 139   bool warn_search_mismatch;
 140
 141   /* If non-zero check section addresses, once computed,
 142      for overlaps.  Relocatable links only check when this is > 0.  */
 143   signed char check_section_addresses;
 144
 145   /* If TRUE allow the linking of input files in an unknown architecture
 146      assuming that the user knows what they are doing.  This was the old
 147      behaviour of the linker.  The new default behaviour is to reject such
 148      input files.  */
 149   bool accept_unknown_input_arch;
 150
 151   /* Name of the import library to generate.  */
 152   char *out_implib_filename;
 153
 154   /* If TRUE we'll just print the default output on stdout.  */
 155   bool print_output_format;
 156
 157   /* If set, display the target memory usage (per memory region).  */
 158   bool print_memory_usage;
 159
 160   /* Should we force section groups to be resolved?  Controlled with
 161      --force-group-allocation on the command line or FORCE_GROUP_ALLOCATION
 162      in the linker script.  */
 163   bool force_group_allocation;
 164
 165   /* Big or little endian as set on command line.  */
 166   enum endian_enum endian;
 167
 168   /* Name of runtime interpreter to invoke.  */
 169   char *interpreter;
 170
 171   /* Name to give runtime library from the -soname argument.  */
 172   char *soname;
 173
 174   /* Runtime library search path from the -rpath argument.  */
 175   char *rpath;
 176
 177   /* Link time runtime library search path from the -rpath-link
 178      argument.  */
 179   char *rpath_link;
 180
 181   /* Name of shared object whose symbol table should be filtered with
 182      this shared object.  From the --filter option.  */
 183   char *filter_shlib;
 184
 185   /* Name of shared object for whose symbol table this shared object
 186      is an auxiliary filter.  From the --auxiliary option.  */
 187   char **auxiliary_filters;
 188
 189   /* A version symbol to be applied to the symbol names found in the
 190      .exports sections.  */
 191   char *version_exports_section;
 192
 193   /* Default linker script.  */
 194   char *default_script;
 195 } args_type;
 196
 197 extern args_type command_line;
 198
 199 typedef int token_code_type;
 200
 201 /* Different ways we can handle orphan sections.  */
 202
 203 enum orphan_handling_enum
 204 {
 205   /* The classic strategy, find a suitable section to place the orphan
 206      into.  */
 207   orphan_handling_place = 0,
 208
 209   /* Discard any orphan sections as though they were assign to the section
 210      /DISCARD/.  */
 211   orphan_handling_discard,
 212
 213   /* Find somewhere to place the orphan section, as with
 214      ORPHAN_HANDLING_PLACE, but also issue a warning.  */
 215   orphan_handling_warn,
 216
 217   /* Issue a fatal error if any orphan sections are found.  */
 218   orphan_handling_error,
 219 };
 220
 221 typedef struct
 222 {
 223   bool magic_demand_paged;
 224   bool make_executable;
 225
 226   /* If TRUE, -shared is supported.  */
 227   /* ??? A better way to do this is perhaps to define this in the
 228      ld_emulation_xfer_struct since this is really a target dependent
 229      parameter.  */
 230   bool has_shared;
 231
 232   /* If TRUE, build constructors.  */
 233   bool build_constructors;
 234
 235   /* If TRUE, warn about any constructors.  */
 236   bool warn_constructors;
 237
 238   /* If TRUE, warn about merging common symbols with others.  */
 239   bool warn_common;
 240
 241   /* If TRUE, only warn once about a particular undefined symbol.  */
 242   bool warn_once;
 243
 244   /* How should we deal with orphan sections.  */
 245   enum orphan_handling_enum orphan_handling;
 246
 247   /* If TRUE, warn if multiple global-pointers are needed (Alpha
 248      only).  */
 249   bool warn_multiple_gp;
 250
 251   /* If TRUE, warn if the starting address of an output section
 252      changes due to the alignment of an input section.  */
 253   bool warn_section_align;
 254
 255   /* If TRUE, warning messages are fatal */
 256   bool fatal_warnings;
 257
 258   sort_order sort_common;
 259
 260   bool text_read_only;
 261
 262   bool stats;
 263
 264   /* If set, orphan input sections will be mapped to separate output
 265      sections.  */
 266   bool unique_orphan_sections;
 267
 268   /* If set, only search library directories explicitly selected
 269      on the command line.  */
 270   bool only_cmd_line_lib_dirs;
 271
 272   /* If set, numbers and absolute symbols are simply treated as
 273      numbers everywhere.  */
 274   bool sane_expr;
 275
 276   /* If set, code and non-code sections should never be in one segment.  */
 277   bool separate_code;
 278
 279   /* The rpath separation character.  Usually ':'.  */
 280   char rpath_separator;
 281
 282   char *map_filename;
 283   FILE *map_file;
 284
 285   char *dependency_file;
 286
 287   unsigned int split_by_reloc;
 288   bfd_size_type split_by_file;
 289
 290   /* The size of the hash table to use.  */
 291   unsigned long hash_table_size;
 292
 293   /* If set, print discarded sections in map file output.  */
 294   bool print_map_discarded;
 295
 296   /* If set, emit the names and types of statically-linked variables
 297      into the CTF.  */
 298   bool ctf_variables;
 299
 300   /* If set, share only duplicated types in CTF, rather than sharing
 301      all types that are not in conflict.  */
 302   bool ctf_share_duplicated;
 303 } ld_config_type;
 304
 305 extern ld_config_type config;
 306
 307 extern FILE * saved_script_handle;
 308 extern bool force_make_executable;
 309
 310 extern int yyparse (void);
 311 extern void add_cref (const char *, bfd *, asection *, bfd_vma);
 312 extern bool handle_asneeded_cref (bfd *, enum notice_asneeded_action);
 313 extern void output_cref (FILE *);
 314 extern void check_nocrossrefs (void);
 315 extern void ld_abort (const char *, int, const char *) ATTRIBUTE_NORETURN;
 316
 317 /* If gcc >= 2.6, we can give a function name, too.  */
 318 #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 6)
 319 #define __PRETTY_FUNCTION__  NULL
 320 #endif
 321
 322 #undef abort
 323 #define abort() ld_abort (__FILE__, __LINE__, __PRETTY_FUNCTION__)
 324
 325 #endif