ld/ld.h

   1 /* ld.h -- general linker header file
   2    Copyright (C) 1991-2020 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 #ifdef HAVE_LOCALE_H
  25 #endif
  26 #ifndef SEEK_CUR
  27 #define SEEK_CUR 1
  28 #endif
  29 #ifndef SEEK_END
  30 #define SEEK_END 2
  31 #endif
  32
  33 #ifdef HAVE_LOCALE_H
  34 # ifndef ENABLE_NLS
  35    /* The Solaris version of locale.h always includes libintl.h.  If we have
  36       been configured with --disable-nls then ENABLE_NLS will not be defined
  37       and the dummy definitions of bindtextdomain (et al) below will conflict
  38       with the defintions in libintl.h.  So we define these values to prevent
  39       the bogus inclusion of libintl.h.  */
  40 #  define _LIBINTL_H
  41 #  define _LIBGETTEXT_H
  42 # endif
  43 # include <locale.h>
  44 #endif
  45
  46 #ifdef ENABLE_NLS
  47 # include <libintl.h>
  48 # define _(String) gettext (String)
  49 # ifdef gettext_noop
  50 #  define N_(String) gettext_noop (String)
  51 # else
  52 #  define N_(String) (String)
  53 # endif
  54 #else
  55 # define gettext(Msgid) (Msgid)
  56 # define dgettext(Domainname, Msgid) (Msgid)
  57 # define dcgettext(Domainname, Msgid, Category) (Msgid)
  58 # define ngettext(Msgid1, Msgid2, n) \
  59   (n == 1 ? Msgid1 : Msgid2)
  60 # define dngettext(Domainname, Msgid1, Msgid2, n) \
  61   (n == 1 ? Msgid1 : Msgid2)
  62 # define dcngettext(Domainname, Msgid1, Msgid2, n, Category) \
  63   (n == 1 ? Msgid1 : Msgid2)
  64 # define textdomain(Domainname) do {} while (0)
  65 # define bindtextdomain(Domainname, Dirname) do {} while (0)
  66 # define _(String) (String)
  67 # define N_(String) (String)
  68 #endif
  69
  70 /* Look in this environment name for the linker to pretend to be */
  71 #define EMULATION_ENVIRON "LDEMULATION"
  72 /* If in there look for the strings: */
  73
  74 /* Look in this variable for a target format */
  75 #define TARGET_ENVIRON "GNUTARGET"
  76
  77 /* Input sections which are put in a section of this name are actually
  78    discarded.  */
  79 #define DISCARD_SECTION_NAME "/DISCARD/"
  80
  81 /* A file name list.  */
  82 typedef struct name_list
  83 {
  84   const char *name;
  85   struct name_list *next;
  86 }
  87 name_list;
  88
  89 typedef enum {sort_none, sort_ascending, sort_descending} sort_order;
  90
  91 /* A wildcard specification.  */
  92
  93 typedef enum
  94 {
  95   none, by_name, by_alignment, by_name_alignment, by_alignment_name,
  96   by_none, by_init_priority
  97 } sort_type;
  98
  99 extern sort_type sort_section;
 100
 101 struct wildcard_spec
 102 {
 103   const char *name;
 104   struct name_list *exclude_name_list;
 105   sort_type sorted;
 106   struct flag_info *section_flag_list;
 107 };
 108
 109 struct wildcard_list
 110 {
 111   struct wildcard_list *next;
 112   struct wildcard_spec spec;
 113 };
 114
 115 #define BYTE_SIZE       (1)
 116 #define SHORT_SIZE      (2)
 117 #define LONG_SIZE       (4)
 118 #define QUAD_SIZE       (8)
 119
 120 enum endian_enum { ENDIAN_UNSET = 0, ENDIAN_BIG, ENDIAN_LITTLE };
 121
 122 typedef struct
 123 {
 124   /* 1 => assign space to common symbols even if `relocatable_output'.  */
 125   bfd_boolean force_common_definition;
 126
 127   /* If TRUE, build MIPS embedded PIC relocation tables in the output
 128      file.  */
 129   bfd_boolean embedded_relocs;
 130
 131   /* If TRUE, force generation of a file with a .exe file.  */
 132   bfd_boolean force_exe_suffix;
 133
 134   /* If TRUE, generate a cross reference report.  */
 135   bfd_boolean cref;
 136
 137   /* If TRUE (which is the default), warn about mismatched input
 138      files.  */
 139   bfd_boolean warn_mismatch;
 140
 141   /* Warn on attempting to open an incompatible library during a library
 142      search.  */
 143   bfd_boolean warn_search_mismatch;
 144
 145   /* If non-zero check section addresses, once computed,
 146      for overlaps.  Relocatable links only check when this is > 0.  */
 147   signed char check_section_addresses;
 148
 149   /* If TRUE allow the linking of input files in an unknown architecture
 150      assuming that the user knows what they are doing.  This was the old
 151      behaviour of the linker.  The new default behaviour is to reject such
 152      input files.  */
 153   bfd_boolean accept_unknown_input_arch;
 154
 155   /* Name of the import library to generate.  */
 156   char *out_implib_filename;
 157
 158   /* If TRUE we'll just print the default output on stdout.  */
 159   bfd_boolean print_output_format;
 160
 161   /* If set, display the target memory usage (per memory region).  */
 162   bfd_boolean print_memory_usage;
 163
 164   /* Should we force section groups to be resolved?  Controlled with
 165      --force-group-allocation on the command line or FORCE_GROUP_ALLOCATION
 166      in the linker script.  */
 167   bfd_boolean force_group_allocation;
 168
 169   /* Big or little endian as set on command line.  */
 170   enum endian_enum endian;
 171
 172   /* Name of runtime interpreter to invoke.  */
 173   char *interpreter;
 174
 175   /* Name to give runtime library from the -soname argument.  */
 176   char *soname;
 177
 178   /* Runtime library search path from the -rpath argument.  */
 179   char *rpath;
 180
 181   /* Link time runtime library search path from the -rpath-link
 182      argument.  */
 183   char *rpath_link;
 184
 185   /* Name of shared object whose symbol table should be filtered with
 186      this shared object.  From the --filter option.  */
 187   char *filter_shlib;
 188
 189   /* Name of shared object for whose symbol table this shared object
 190      is an auxiliary filter.  From the --auxiliary option.  */
 191   char **auxiliary_filters;
 192
 193   /* A version symbol to be applied to the symbol names found in the
 194      .exports sections.  */
 195   char *version_exports_section;
 196
 197   /* Default linker script.  */
 198   char *default_script;
 199 } args_type;
 200
 201 extern args_type command_line;
 202
 203 typedef int token_code_type;
 204
 205 /* Different ways we can handle orphan sections.  */
 206
 207 enum orphan_handling_enum
 208 {
 209   /* The classic strategy, find a suitable section to place the orphan
 210      into.  */
 211   orphan_handling_place = 0,
 212
 213   /* Discard any orphan sections as though they were assign to the section
 214      /DISCARD/.  */
 215   orphan_handling_discard,
 216
 217   /* Find somewhere to place the orphan section, as with
 218      ORPHAN_HANDLING_PLACE, but also issue a warning.  */
 219   orphan_handling_warn,
 220
 221   /* Issue a fatal error if any orphan sections are found.  */
 222   orphan_handling_error,
 223 };
 224
 225 typedef struct
 226 {
 227   bfd_boolean magic_demand_paged;
 228   bfd_boolean make_executable;
 229
 230   /* If TRUE, -shared is supported.  */
 231   /* ??? A better way to do this is perhaps to define this in the
 232      ld_emulation_xfer_struct since this is really a target dependent
 233      parameter.  */
 234   bfd_boolean has_shared;
 235
 236   /* If TRUE, build constructors.  */
 237   bfd_boolean build_constructors;
 238
 239   /* If TRUE, warn about any constructors.  */
 240   bfd_boolean warn_constructors;
 241
 242   /* If TRUE, warn about merging common symbols with others.  */
 243   bfd_boolean warn_common;
 244
 245   /* If TRUE, only warn once about a particular undefined symbol.  */
 246   bfd_boolean warn_once;
 247
 248   /* How should we deal with orphan sections.  */
 249   enum orphan_handling_enum orphan_handling;
 250
 251   /* If TRUE, warn if multiple global-pointers are needed (Alpha
 252      only).  */
 253   bfd_boolean warn_multiple_gp;
 254
 255   /* If TRUE, warn if the starting address of an output section
 256      changes due to the alignment of an input section.  */
 257   bfd_boolean warn_section_align;
 258
 259   /* If TRUE, warning messages are fatal */
 260   bfd_boolean fatal_warnings;
 261
 262   sort_order sort_common;
 263
 264   bfd_boolean text_read_only;
 265
 266   bfd_boolean stats;
 267
 268   /* If set, orphan input sections will be mapped to separate output
 269      sections.  */
 270   bfd_boolean unique_orphan_sections;
 271
 272   /* If set, only search library directories explicitly selected
 273      on the command line.  */
 274   bfd_boolean only_cmd_line_lib_dirs;
 275
 276   /* If set, numbers and absolute symbols are simply treated as
 277      numbers everywhere.  */
 278   bfd_boolean sane_expr;
 279
 280   /* If set, code and non-code sections should never be in one segment.  */
 281   bfd_boolean separate_code;
 282
 283   /* The rpath separation character.  Usually ':'.  */
 284   char rpath_separator;
 285
 286   char *map_filename;
 287   FILE *map_file;
 288
 289   char *dependency_file;
 290
 291   unsigned int split_by_reloc;
 292   bfd_size_type split_by_file;
 293
 294   /* The size of the hash table to use.  */
 295   unsigned long hash_table_size;
 296
 297   /* The maximum page size for ELF.  */
 298   bfd_vma maxpagesize;
 299
 300   /* The common page size for ELF.  */
 301   bfd_vma commonpagesize;
 302
 303   /* If set, print discarded sections in map file output.  */
 304   bfd_boolean print_map_discarded;
 305
 306   /* If set, emit the names and types of statically-linked variables
 307      into the CTF.  */
 308   bfd_boolean ctf_variables;
 309
 310   /* If set, share only duplicated types in CTF, rather than sharing
 311      all types that are not in conflict.  */
 312   bfd_boolean ctf_share_duplicated;
 313 } ld_config_type;
 314
 315 extern ld_config_type config;
 316
 317 extern FILE * saved_script_handle;
 318 extern bfd_boolean force_make_executable;
 319
 320 extern int yyparse (void);
 321 extern void add_cref (const char *, bfd *, asection *, bfd_vma);
 322 extern bfd_boolean handle_asneeded_cref (bfd *, enum notice_asneeded_action);
 323 extern void output_cref (FILE *);
 324 extern void check_nocrossrefs (void);
 325 extern void ld_abort (const char *, int, const char *) ATTRIBUTE_NORETURN;
 326
 327 /* If gcc >= 2.6, we can give a function name, too.  */
 328 #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 6)
 329 #define __PRETTY_FUNCTION__  NULL
 330 #endif
 331
 332 #undef abort
 333 #define abort() ld_abort (__FILE__, __LINE__, __PRETTY_FUNCTION__)
 334
 335 #endif