xref: /openbsd-src/gnu/usr.bin/binutils-2.17/ld/ld.h (revision b841744944f6c4f20c64e53feab02094e01cb9ec)
1 /* ld.h -- general linker header file
2    Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3    2001, 2002, 2003, 2004, 2005
4    Free Software Foundation, Inc.
5 
6    This file is part of GLD, the Gnu Linker.
7 
8    GLD is free software; you can redistribute it and/or modify
9    it under the terms of the GNU General Public License as published by
10    the Free Software Foundation; either version 2, or (at your option)
11    any later version.
12 
13    GLD is distributed in the hope that it will be useful,
14    but WITHOUT ANY WARRANTY; without even the implied warranty of
15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16    GNU General Public License for more details.
17 
18    You should have received a copy of the GNU General Public License
19    along with GLD; see the file COPYING.  If not, write to the Free
20    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
21    02110-1301, USA.  */
22 
23 #ifndef LD_H
24 #define LD_H
25 
26 #ifdef HAVE_LOCALE_H
27 #endif
28 #ifndef SEEK_CUR
29 #define SEEK_CUR 1
30 #endif
31 #ifndef SEEK_END
32 #define SEEK_END 2
33 #endif
34 
35 #if defined(__GNUC__) && !defined(C_ALLOCA)
36 # undef alloca
37 # define alloca __builtin_alloca
38 #else
39 # if defined(HAVE_ALLOCA_H) && !defined(C_ALLOCA)
40 #  include <alloca.h>
41 # else
42 #  ifndef alloca /* predefined by HP cc +Olibcalls */
43 #   if !defined (__STDC__) && !defined (__hpux)
44 char *alloca ();
45 #   else
46 void *alloca ();
47 #   endif /* __STDC__, __hpux */
48 #  endif /* alloca */
49 # endif /* HAVE_ALLOCA_H */
50 #endif
51 
52 
53 #ifdef HAVE_LOCALE_H
54 # ifndef ENABLE_NLS
55    /* The Solaris version of locale.h always includes libintl.h.  If we have
56       been configured with --disable-nls then ENABLE_NLS will not be defined
57       and the dummy definitions of bindtextdomain (et al) below will conflict
58       with the defintions in libintl.h.  So we define these values to prevent
59       the bogus inclusion of libintl.h.  */
60 #  define _LIBINTL_H
61 #  define _LIBGETTEXT_H
62 # endif
63 # include <locale.h>
64 #endif
65 
66 #ifdef ENABLE_NLS
67 # include <libintl.h>
68 # define _(String) gettext (String)
69 # ifdef gettext_noop
70 #  define N_(String) gettext_noop (String)
71 # else
72 #  define N_(String) (String)
73 # endif
74 #else
75 # define gettext(Msgid) (Msgid)
76 # define dgettext(Domainname, Msgid) (Msgid)
77 # define dcgettext(Domainname, Msgid, Category) (Msgid)
78 # define textdomain(Domainname) while (0) /* nothing */
79 # define bindtextdomain(Domainname, Dirname) while (0) /* nothing */
80 # define _(String) (String)
81 # define N_(String) (String)
82 #endif
83 
84 #include "bin-bugs.h"
85 
86 /* Look in this environment name for the linker to pretend to be */
87 #define EMULATION_ENVIRON "LDEMULATION"
88 /* If in there look for the strings: */
89 
90 /* Look in this variable for a target format */
91 #define TARGET_ENVIRON "GNUTARGET"
92 
93 /* Input sections which are put in a section of this name are actually
94    discarded.  */
95 #define DISCARD_SECTION_NAME "/DISCARD/"
96 
97 /* A file name list */
98 typedef struct name_list {
99   const char *name;
100   struct name_list *next;
101 }
102 name_list;
103 
104 /* A wildcard specification.  */
105 
106 typedef enum {
107   none, by_name, by_alignment, by_name_alignment, by_alignment_name
108 } sort_type;
109 
110 extern sort_type sort_section;
111 
112 struct wildcard_spec {
113   const char *name;
114   struct name_list *exclude_name_list;
115   sort_type sorted;
116 };
117 
118 struct wildcard_list {
119   struct wildcard_list *next;
120   struct wildcard_spec spec;
121 };
122 
123 struct map_symbol_def {
124   struct bfd_link_hash_entry *entry;
125   struct map_symbol_def *next;
126 };
127 
128 /* The initial part of fat_user_section_struct has to be idential with
129    lean_user_section_struct.  */
130 typedef struct fat_user_section_struct {
131   /* For input sections, when writing a map file: head / tail of a linked
132      list of hash table entries for symbols defined in this section.  */
133   struct map_symbol_def *map_symbol_def_head;
134   struct map_symbol_def **map_symbol_def_tail;
135 } fat_section_userdata_type;
136 
137 #define get_userdata(x) ((x)->userdata)
138 
139 #define BYTE_SIZE	(1)
140 #define SHORT_SIZE	(2)
141 #define LONG_SIZE	(4)
142 #define QUAD_SIZE	(8)
143 
144 typedef struct {
145   /* 1 => assign space to common symbols even if `relocatable_output'.  */
146   bfd_boolean force_common_definition;
147 
148   /* 1 => do not assign addresses to common symbols.  */
149   bfd_boolean inhibit_common_definition;
150   bfd_boolean relax;
151 
152   /* Name of runtime interpreter to invoke.  */
153   char *interpreter;
154 
155   /* Name to give runtime libary from the -soname argument.  */
156   char *soname;
157 
158   /* Runtime library search path from the -rpath argument.  */
159   char *rpath;
160 
161   /* Link time runtime library search path from the -rpath-link
162      argument.  */
163   char *rpath_link;
164 
165   /* Big or little endian as set on command line.  */
166   enum { ENDIAN_UNSET = 0, ENDIAN_BIG, ENDIAN_LITTLE } endian;
167 
168   /* If TRUE, build MIPS embedded PIC relocation tables in the output
169      file.  */
170   bfd_boolean embedded_relocs;
171 
172   /* If TRUE, force generation of a file with a .exe file.  */
173   bfd_boolean force_exe_suffix;
174 
175   /* If TRUE, generate a cross reference report.  */
176   bfd_boolean cref;
177 
178   /* If TRUE (which is the default), warn about mismatched input
179      files.  */
180   bfd_boolean warn_mismatch;
181 
182   /* Name of shared object whose symbol table should be filtered with
183      this shared object.  From the --filter option.  */
184   char *filter_shlib;
185 
186   /* Name of shared object for whose symbol table this shared object
187      is an auxiliary filter.  From the --auxiliary option.  */
188   char **auxiliary_filters;
189 
190   /* A version symbol to be applied to the symbol names found in the
191      .exports sections.  */
192   char *version_exports_section;
193 
194   /* If TRUE (the default) check section addresses, once compute,
195      fpor overlaps.  */
196   bfd_boolean check_section_addresses;
197 
198   /* If TRUE allow the linking of input files in an unknown architecture
199      assuming that the user knows what they are doing.  This was the old
200      behaviour of the linker.  The new default behaviour is to reject such
201      input files.  */
202   bfd_boolean accept_unknown_input_arch;
203 } args_type;
204 
205 extern args_type command_line;
206 
207 typedef int token_code_type;
208 
209 typedef struct {
210   bfd_size_type specified_data_size;
211   bfd_boolean magic_demand_paged;
212   bfd_boolean make_executable;
213 
214   /* If TRUE, doing a dynamic link.  */
215   bfd_boolean dynamic_link;
216 
217   /* If TRUE, -shared is supported.  */
218   /* ??? A better way to do this is perhaps to define this in the
219      ld_emulation_xfer_struct since this is really a target dependent
220      parameter.  */
221   bfd_boolean has_shared;
222 
223   /* If TRUE, build constructors.  */
224   bfd_boolean build_constructors;
225 
226   /* If TRUE, warn about any constructors.  */
227   bfd_boolean warn_constructors;
228 
229   /* If TRUE, warn about merging common symbols with others.  */
230   bfd_boolean warn_common;
231 
232   /* If TRUE, only warn once about a particular undefined symbol.  */
233   bfd_boolean warn_once;
234 
235   /* If TRUE, warn if multiple global-pointers are needed (Alpha
236      only).  */
237   bfd_boolean warn_multiple_gp;
238 
239   /* If TRUE, warn if the starting address of an output section
240      changes due to the alignment of an input section.  */
241   bfd_boolean warn_section_align;
242 
243   /* If TRUE, warning messages are fatal */
244   bfd_boolean fatal_warnings;
245 
246   bfd_boolean sort_common;
247 
248   bfd_boolean text_read_only;
249 
250   /* Classic ELF executable which has data and bss next to each
251      other with no padding for GOT/PLT. */
252   bfd_boolean data_bss_contig;
253 
254   char *map_filename;
255   FILE *map_file;
256 
257   bfd_boolean stats;
258 
259   /* If set, orphan input sections will be mapped to separate output
260      sections.  */
261   bfd_boolean unique_orphan_sections;
262 
263   unsigned int split_by_reloc;
264   bfd_size_type split_by_file;
265 
266   /* If set, only search library directories explicitly selected
267      on the command line.  */
268   bfd_boolean only_cmd_line_lib_dirs;
269 
270   /* The size of the hash table to use.  */
271   bfd_size_type hash_table_size;
272 } ld_config_type;
273 
274 extern ld_config_type config;
275 
276 extern FILE * saved_script_handle;
277 extern bfd_boolean force_make_executable;
278 
279 /* Non-zero if we are processing a --defsym from the command line.  */
280 extern int parsing_defsym;
281 
282 extern int yyparse (void);
283 extern void add_cref (const char *, bfd *, asection *, bfd_vma);
284 extern void output_cref (FILE *);
285 extern void check_nocrossrefs (void);
286 extern void ld_abort (const char *, int, const char *) ATTRIBUTE_NORETURN;
287 
288 /* If gcc >= 2.6, we can give a function name, too.  */
289 #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 6)
290 #define __PRETTY_FUNCTION__  NULL
291 #endif
292 
293 #undef abort
294 #define abort() ld_abort (__FILE__, __LINE__, __PRETTY_FUNCTION__)
295 
296 #endif
297