1 /* Main program of GNU linker.
2 Copyright (C) 1991-2022 Free Software Foundation, Inc.
3 Written by Steve Chamberlain steve@cygnus.com
4
5 This file is part of the GNU Binutils.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
21
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "safe-ctype.h"
25 #include "libiberty.h"
26 #include "progress.h"
27 #include "bfdlink.h"
28 #include "ctf-api.h"
29 #include "filenames.h"
30 #include "elf/common.h"
31
32 #include "ld.h"
33 #include "ldmain.h"
34 #include "ldmisc.h"
35 #include "ldwrite.h"
36 #include "ldexp.h"
37 #include "ldlang.h"
38 #include <ldgram.h>
39 #include "ldlex.h"
40 #include "ldfile.h"
41 #include "ldemul.h"
42 #include "ldctor.h"
43 #if BFD_SUPPORTS_PLUGINS
44 #include "plugin.h"
45 #include "plugin-api.h"
46 #endif /* BFD_SUPPORTS_PLUGINS */
47
48 /* Somewhere above, sys/stat.h got included. */
49 #if !defined(S_ISDIR) && defined(S_IFDIR)
50 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
51 #endif
52
53 #include <string.h>
54
55 #ifndef TARGET_SYSTEM_ROOT
56 #define TARGET_SYSTEM_ROOT ""
57 #endif
58
59 /* EXPORTS */
60
61 FILE *saved_script_handle = NULL;
62 FILE *previous_script_handle = NULL;
63 bool force_make_executable = false;
64
65 char *default_target;
66 const char *output_filename = "a.out";
67
68 /* Name this program was invoked by. */
69 char *program_name;
70
71 /* The prefix for system library directories. */
72 const char *ld_sysroot;
73
74 /* The canonical representation of ld_sysroot. */
75 char *ld_canon_sysroot;
76 int ld_canon_sysroot_len;
77
78 /* Set by -G argument, for targets like MIPS ELF. */
79 int g_switch_value = 8;
80
81 /* Nonzero means print names of input files as processed. */
82 unsigned int trace_files;
83
84 /* Nonzero means report actions taken by the linker, and describe the linker script in use. */
85 bool verbose;
86
87 /* Nonzero means version number was printed, so exit successfully
88 instead of complaining if no input files are given. */
89 bool version_printed;
90
91 /* TRUE if we should demangle symbol names. */
92 bool demangling;
93
94 args_type command_line;
95
96 ld_config_type config;
97
98 sort_type sort_section;
99
100 static const char *get_sysroot
101 (int, char **);
102 static char *get_emulation
103 (int, char **);
104 static bool add_archive_element
105 (struct bfd_link_info *, bfd *, const char *, bfd **);
106 static void multiple_definition
107 (struct bfd_link_info *, struct bfd_link_hash_entry *,
108 bfd *, asection *, bfd_vma);
109 static void multiple_common
110 (struct bfd_link_info *, struct bfd_link_hash_entry *,
111 bfd *, enum bfd_link_hash_type, bfd_vma);
112 static void add_to_set
113 (struct bfd_link_info *, struct bfd_link_hash_entry *,
114 bfd_reloc_code_real_type, bfd *, asection *, bfd_vma);
115 static void constructor_callback
116 (struct bfd_link_info *, bool, const char *, bfd *,
117 asection *, bfd_vma);
118 static void warning_callback
119 (struct bfd_link_info *, const char *, const char *, bfd *,
120 asection *, bfd_vma);
121 static void warning_find_reloc
122 (bfd *, asection *, void *);
123 static void undefined_symbol
124 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
125 bool);
126 static void reloc_overflow
127 (struct bfd_link_info *, struct bfd_link_hash_entry *, const char *,
128 const char *, bfd_vma, bfd *, asection *, bfd_vma);
129 static void reloc_dangerous
130 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
131 static void unattached_reloc
132 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
133 static bool notice
134 (struct bfd_link_info *, struct bfd_link_hash_entry *,
135 struct bfd_link_hash_entry *, bfd *, asection *, bfd_vma, flagword);
136
137 static struct bfd_link_callbacks link_callbacks =
138 {
139 add_archive_element,
140 multiple_definition,
141 multiple_common,
142 add_to_set,
143 constructor_callback,
144 warning_callback,
145 undefined_symbol,
146 reloc_overflow,
147 reloc_dangerous,
148 unattached_reloc,
149 notice,
150 einfo,
151 info_msg,
152 minfo,
153 ldlang_override_segment_assignment,
154 ldlang_ctf_acquire_strings,
155 NULL,
156 ldlang_ctf_new_dynsym,
157 ldlang_write_ctf_late
158 };
159
160 static bfd_assert_handler_type default_bfd_assert_handler;
161 static bfd_error_handler_type default_bfd_error_handler;
162
163 struct bfd_link_info link_info;
164
165 struct dependency_file
166 {
167 struct dependency_file *next;
168 char *name;
169 };
170
171 static struct dependency_file *dependency_files, *dependency_files_tail;
172
173 void
track_dependency_files(const char * filename)174 track_dependency_files (const char *filename)
175 {
176 struct dependency_file *dep
177 = (struct dependency_file *) xmalloc (sizeof (*dep));
178 dep->name = xstrdup (filename);
179 dep->next = NULL;
180 if (dependency_files == NULL)
181 dependency_files = dep;
182 else
183 dependency_files_tail->next = dep;
184 dependency_files_tail = dep;
185 }
186
187 static void
write_dependency_file(void)188 write_dependency_file (void)
189 {
190 FILE *out;
191 struct dependency_file *dep;
192
193 out = fopen (config.dependency_file, FOPEN_WT);
194 if (out == NULL)
195 {
196 einfo (_("%F%P: cannot open dependency file %s: %E\n"),
197 config.dependency_file);
198 }
199
200 fprintf (out, "%s:", output_filename);
201
202 for (dep = dependency_files; dep != NULL; dep = dep->next)
203 fprintf (out, " \\\n %s", dep->name);
204
205 fprintf (out, "\n");
206 for (dep = dependency_files; dep != NULL; dep = dep->next)
207 fprintf (out, "\n%s:\n", dep->name);
208
209 fclose (out);
210 }
211
212 static void
ld_cleanup(void)213 ld_cleanup (void)
214 {
215 bfd_cache_close_all ();
216 #if BFD_SUPPORTS_PLUGINS
217 plugin_call_cleanup ();
218 #endif
219 if (output_filename && delete_output_file_on_failure)
220 unlink_if_ordinary (output_filename);
221 }
222
223 /* Hook to notice BFD assertions. */
224
225 static void
ld_bfd_assert_handler(const char * fmt,const char * bfdver,const char * file,int line)226 ld_bfd_assert_handler (const char *fmt, const char *bfdver,
227 const char *file, int line)
228 {
229 config.make_executable = false;
230 (*default_bfd_assert_handler) (fmt, bfdver, file, line);
231 }
232
233 /* Hook the bfd error/warning handler for --fatal-warnings. */
234
235 static void
ld_bfd_error_handler(const char * fmt,va_list ap)236 ld_bfd_error_handler (const char *fmt, va_list ap)
237 {
238 if (config.fatal_warnings)
239 config.make_executable = false;
240 (*default_bfd_error_handler) (fmt, ap);
241 }
242
243 int
main(int argc,char ** argv)244 main (int argc, char **argv)
245 {
246 char *emulation;
247 long start_time = get_run_time ();
248
249 #ifdef HAVE_LC_MESSAGES
250 setlocale (LC_MESSAGES, "");
251 #endif
252 setlocale (LC_CTYPE, "");
253 bindtextdomain (PACKAGE, LOCALEDIR);
254 textdomain (PACKAGE);
255
256 program_name = argv[0];
257 xmalloc_set_program_name (program_name);
258
259 START_PROGRESS (program_name, 0);
260
261 expandargv (&argc, &argv);
262
263 if (bfd_init () != BFD_INIT_MAGIC)
264 einfo (_("%F%P: fatal error: libbfd ABI mismatch\n"));
265
266 bfd_set_error_program_name (program_name);
267
268 /* We want to notice and fail on those nasty BFD assertions which are
269 likely to signal incorrect output being generated but otherwise may
270 leave no trace. */
271 default_bfd_assert_handler = bfd_set_assert_handler (ld_bfd_assert_handler);
272
273 /* Also hook the bfd error/warning handler for --fatal-warnings. */
274 default_bfd_error_handler = bfd_set_error_handler (ld_bfd_error_handler);
275
276 xatexit (ld_cleanup);
277
278 /* Set up the sysroot directory. */
279 ld_sysroot = get_sysroot (argc, argv);
280 if (*ld_sysroot)
281 ld_canon_sysroot = lrealpath (ld_sysroot);
282 if (ld_canon_sysroot)
283 {
284 ld_canon_sysroot_len = strlen (ld_canon_sysroot);
285
286 /* is_sysrooted_pathname() relies on no trailing dirsep. */
287 if (ld_canon_sysroot_len > 0
288 && IS_DIR_SEPARATOR (ld_canon_sysroot [ld_canon_sysroot_len - 1]))
289 ld_canon_sysroot [--ld_canon_sysroot_len] = '\0';
290 }
291 else
292 ld_canon_sysroot_len = -1;
293
294 /* Set the default BFD target based on the configured target. Doing
295 this permits the linker to be configured for a particular target,
296 and linked against a shared BFD library which was configured for
297 a different target. The macro TARGET is defined by Makefile. */
298 if (!bfd_set_default_target (TARGET))
299 {
300 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET);
301 xexit (1);
302 }
303
304 #if YYDEBUG
305 {
306 extern int yydebug;
307 yydebug = 1;
308 }
309 #endif
310
311 config.build_constructors = true;
312 config.rpath_separator = ':';
313 config.split_by_reloc = (unsigned) -1;
314 config.split_by_file = (bfd_size_type) -1;
315 config.make_executable = true;
316 config.magic_demand_paged = true;
317 config.text_read_only = true;
318 config.print_map_discarded = true;
319 link_info.disable_target_specific_optimizations = -1;
320
321 command_line.warn_mismatch = true;
322 command_line.warn_search_mismatch = true;
323 command_line.check_section_addresses = -1;
324
325 /* We initialize DEMANGLING based on the environment variable
326 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
327 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
328 environment. Acting the same way here lets us provide the same
329 interface by default. */
330 demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL;
331
332 link_info.allow_undefined_version = true;
333 link_info.keep_memory = true;
334 link_info.max_cache_size = (bfd_size_type) -1;
335 link_info.combreloc = true;
336 link_info.strip_discarded = true;
337 link_info.prohibit_multiple_definition_absolute = false;
338 link_info.textrel_check = DEFAULT_LD_TEXTREL_CHECK;
339 link_info.emit_hash = DEFAULT_EMIT_SYSV_HASH;
340 link_info.emit_gnu_hash = DEFAULT_EMIT_GNU_HASH;
341 link_info.callbacks = &link_callbacks;
342 link_info.input_bfds_tail = &link_info.input_bfds;
343 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
344 and _fini symbols. We are compatible. */
345 link_info.init_function = "_init";
346 link_info.fini_function = "_fini";
347 link_info.relax_pass = 1;
348 link_info.extern_protected_data = -1;
349 link_info.dynamic_undefined_weak = -1;
350 link_info.indirect_extern_access = -1;
351 link_info.pei386_auto_import = -1;
352 link_info.spare_dynamic_tags = 5;
353 link_info.path_separator = ':';
354 #ifdef DEFAULT_FLAG_COMPRESS_DEBUG
355 link_info.compress_debug = COMPRESS_DEBUG_GABI_ZLIB;
356 #endif
357 #ifdef DEFAULT_NEW_DTAGS
358 link_info.new_dtags = DEFAULT_NEW_DTAGS;
359 #endif
360 link_info.start_stop_gc = false;
361 link_info.start_stop_visibility = STV_PROTECTED;
362
363 ldfile_add_arch ("");
364 emulation = get_emulation (argc, argv);
365 ldemul_choose_mode (emulation);
366 default_target = ldemul_choose_target (argc, argv);
367 lang_init ();
368 ldexp_init ();
369 ldemul_before_parse ();
370 lang_has_input_file = false;
371 parse_args (argc, argv);
372
373 if (config.hash_table_size != 0)
374 bfd_hash_set_default_size (config.hash_table_size);
375
376 #if BFD_SUPPORTS_PLUGINS
377 /* Now all the plugin arguments have been gathered, we can load them. */
378 plugin_load_plugins ();
379 #endif /* BFD_SUPPORTS_PLUGINS */
380
381 ldemul_set_symbols ();
382
383 /* If we have not already opened and parsed a linker script,
384 try the default script from command line first. */
385 if (saved_script_handle == NULL
386 && command_line.default_script != NULL)
387 {
388 ldfile_open_script_file (command_line.default_script);
389 parser_input = input_script;
390 yyparse ();
391 }
392
393 /* If we have not already opened and parsed a linker script
394 read the emulation's appropriate default script. */
395 if (saved_script_handle == NULL)
396 {
397 int isfile;
398 char *s = ldemul_get_script (&isfile);
399
400 if (isfile)
401 ldfile_open_default_command_file (s);
402 else
403 {
404 lex_string = s;
405 lex_redirect (s, _("built in linker script"), 1);
406 }
407 parser_input = input_script;
408 yyparse ();
409 lex_string = NULL;
410 }
411
412 if (verbose)
413 {
414 if (saved_script_handle)
415 info_msg (_("using external linker script:"));
416 else
417 info_msg (_("using internal linker script:"));
418 info_msg ("\n==================================================\n");
419
420 if (saved_script_handle)
421 {
422 static const int ld_bufsz = 8193;
423 size_t n;
424 char *buf = (char *) xmalloc (ld_bufsz);
425
426 rewind (saved_script_handle);
427 while ((n = fread (buf, 1, ld_bufsz - 1, saved_script_handle)) > 0)
428 {
429 buf[n] = 0;
430 info_msg ("%s", buf);
431 }
432 rewind (saved_script_handle);
433 free (buf);
434 }
435 else
436 {
437 int isfile;
438
439 info_msg (ldemul_get_script (&isfile));
440 }
441
442 info_msg ("\n==================================================\n");
443 }
444
445 if (command_line.force_group_allocation
446 || !bfd_link_relocatable (&link_info))
447 link_info.resolve_section_groups = true;
448 else
449 link_info.resolve_section_groups = false;
450
451 if (command_line.print_output_format)
452 info_msg ("%s\n", lang_get_output_target ());
453
454 lang_final ();
455
456 /* If the only command line argument has been -v or --version or --verbose
457 then ignore any input files provided by linker scripts and exit now.
458 We do not want to create an output file when the linker is just invoked
459 to provide version information. */
460 if (argc == 2 && version_printed)
461 xexit (0);
462
463 if (link_info.inhibit_common_definition && !bfd_link_dll (&link_info))
464 einfo (_("%F%P: --no-define-common may not be used without -shared\n"));
465
466 if (!lang_has_input_file)
467 {
468 if (version_printed || command_line.print_output_format)
469 xexit (0);
470 einfo (_("%F%P: no input files\n"));
471 }
472
473 if (verbose)
474 info_msg (_("%P: mode %s\n"), emulation);
475
476 ldemul_after_parse ();
477
478 if (config.map_filename)
479 {
480 if (strcmp (config.map_filename, "-") == 0)
481 {
482 config.map_file = stdout;
483 }
484 else
485 {
486 config.map_file = fopen (config.map_filename, FOPEN_WT);
487 if (config.map_file == (FILE *) NULL)
488 {
489 bfd_set_error (bfd_error_system_call);
490 einfo (_("%F%P: cannot open map file %s: %E\n"),
491 config.map_filename);
492 }
493 }
494 link_info.has_map_file = true;
495 }
496
497 lang_process ();
498
499 /* Print error messages for any missing symbols, for any warning
500 symbols, and possibly multiple definitions. */
501 if (bfd_link_relocatable (&link_info))
502 link_info.output_bfd->flags &= ~EXEC_P;
503 else
504 link_info.output_bfd->flags |= EXEC_P;
505
506 if ((link_info.compress_debug & COMPRESS_DEBUG))
507 {
508 link_info.output_bfd->flags |= BFD_COMPRESS;
509 if (link_info.compress_debug == COMPRESS_DEBUG_GABI_ZLIB)
510 link_info.output_bfd->flags |= BFD_COMPRESS_GABI;
511 }
512
513 ldwrite ();
514
515 if (config.map_file != NULL)
516 lang_map ();
517 if (command_line.cref)
518 output_cref (config.map_file != NULL ? config.map_file : stdout);
519 if (nocrossref_list != NULL)
520 check_nocrossrefs ();
521 if (command_line.print_memory_usage)
522 lang_print_memory_usage ();
523 #if 0
524 {
525 struct bfd_link_hash_entry *h;
526
527 h = bfd_link_hash_lookup (link_info.hash, "__image_base__", 0,0,1);
528 fprintf (stderr, "lookup = %p val %lx\n", h, h ? h->u.def.value : 1);
529 }
530 #endif
531 ldexp_finish ();
532 lang_finish ();
533
534 if (config.dependency_file != NULL)
535 write_dependency_file ();
536
537 /* Even if we're producing relocatable output, some non-fatal errors should
538 be reported in the exit status. (What non-fatal errors, if any, do we
539 want to ignore for relocatable output?) */
540 if (!config.make_executable && !force_make_executable)
541 {
542 if (verbose)
543 einfo (_("%P: link errors found, deleting executable `%s'\n"),
544 output_filename);
545
546 /* The file will be removed by ld_cleanup. */
547 xexit (1);
548 }
549 else
550 {
551 if (!bfd_close (link_info.output_bfd))
552 einfo (_("%F%P: %pB: final close failed: %E\n"), link_info.output_bfd);
553
554 /* If the --force-exe-suffix is enabled, and we're making an
555 executable file and it doesn't end in .exe, copy it to one
556 which does. */
557 if (!bfd_link_relocatable (&link_info)
558 && command_line.force_exe_suffix)
559 {
560 int len = strlen (output_filename);
561
562 if (len < 4
563 || (strcasecmp (output_filename + len - 4, ".exe") != 0
564 && strcasecmp (output_filename + len - 4, ".dll") != 0))
565 {
566 FILE *src;
567 FILE *dst;
568 const int bsize = 4096;
569 char *buf = (char *) xmalloc (bsize);
570 int l;
571 char *dst_name = (char *) xmalloc (len + 5);
572
573 strcpy (dst_name, output_filename);
574 strcat (dst_name, ".exe");
575 src = fopen (output_filename, FOPEN_RB);
576 dst = fopen (dst_name, FOPEN_WB);
577
578 if (!src)
579 einfo (_("%F%P: unable to open for source of copy `%s'\n"),
580 output_filename);
581 if (!dst)
582 einfo (_("%F%P: unable to open for destination of copy `%s'\n"),
583 dst_name);
584 while ((l = fread (buf, 1, bsize, src)) > 0)
585 {
586 int done = fwrite (buf, 1, l, dst);
587
588 if (done != l)
589 einfo (_("%P: error writing file `%s'\n"), dst_name);
590 }
591
592 fclose (src);
593 if (fclose (dst) == EOF)
594 einfo (_("%P: error closing file `%s'\n"), dst_name);
595 free (dst_name);
596 free (buf);
597 }
598 }
599 }
600
601 END_PROGRESS (program_name);
602
603 if (config.stats)
604 {
605 long run_time = get_run_time () - start_time;
606
607 fflush (stdout);
608 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
609 program_name, run_time / 1000000, run_time % 1000000);
610 fflush (stderr);
611 }
612
613 /* Prevent ld_cleanup from doing anything, after a successful link. */
614 output_filename = NULL;
615
616 xexit (0);
617 return 0;
618 }
619
620 /* If the configured sysroot is relocatable, try relocating it based on
621 default prefix FROM. Return the relocated directory if it exists,
622 otherwise return null. */
623
624 static char *
get_relative_sysroot(const char * from ATTRIBUTE_UNUSED)625 get_relative_sysroot (const char *from ATTRIBUTE_UNUSED)
626 {
627 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
628 char *path;
629 struct stat s;
630
631 path = make_relative_prefix (program_name, from, TARGET_SYSTEM_ROOT);
632 if (path)
633 {
634 if (stat (path, &s) == 0 && S_ISDIR (s.st_mode))
635 return path;
636 free (path);
637 }
638 #endif
639 return 0;
640 }
641
642 /* Return the sysroot directory. Return "" if no sysroot is being used. */
643
644 static const char *
get_sysroot(int argc,char ** argv)645 get_sysroot (int argc, char **argv)
646 {
647 int i;
648 const char *path = NULL;
649
650 for (i = 1; i < argc; i++)
651 if (startswith (argv[i], "--sysroot="))
652 path = argv[i] + strlen ("--sysroot=");
653
654 if (!path)
655 path = get_relative_sysroot (BINDIR);
656
657 if (!path)
658 path = get_relative_sysroot (TOOLBINDIR);
659
660 if (!path)
661 path = TARGET_SYSTEM_ROOT;
662
663 if (IS_DIR_SEPARATOR (*path) && path[1] == 0)
664 path = "";
665
666 return path;
667 }
668
669 /* We need to find any explicitly given emulation in order to initialize the
670 state that's needed by the lex&yacc argument parser (parse_args). */
671
672 static char *
get_emulation(int argc,char ** argv)673 get_emulation (int argc, char **argv)
674 {
675 char *emulation;
676 int i;
677
678 emulation = getenv (EMULATION_ENVIRON);
679 if (emulation == NULL)
680 emulation = DEFAULT_EMULATION;
681
682 for (i = 1; i < argc; i++)
683 {
684 if (startswith (argv[i], "-m"))
685 {
686 if (argv[i][2] == '\0')
687 {
688 /* -m EMUL */
689 if (i < argc - 1)
690 {
691 emulation = argv[i + 1];
692 i++;
693 }
694 else
695 einfo (_("%F%P: missing argument to -m\n"));
696 }
697 else if (strcmp (argv[i], "-mips1") == 0
698 || strcmp (argv[i], "-mips2") == 0
699 || strcmp (argv[i], "-mips3") == 0
700 || strcmp (argv[i], "-mips4") == 0
701 || strcmp (argv[i], "-mips5") == 0
702 || strcmp (argv[i], "-mips32") == 0
703 || strcmp (argv[i], "-mips32r2") == 0
704 || strcmp (argv[i], "-mips32r3") == 0
705 || strcmp (argv[i], "-mips32r5") == 0
706 || strcmp (argv[i], "-mips32r6") == 0
707 || strcmp (argv[i], "-mips64") == 0
708 || strcmp (argv[i], "-mips64r2") == 0
709 || strcmp (argv[i], "-mips64r3") == 0
710 || strcmp (argv[i], "-mips64r5") == 0
711 || strcmp (argv[i], "-mips64r6") == 0)
712 {
713 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
714 passed to the linker by some MIPS compilers. They
715 generally tell the linker to use a slightly different
716 library path. Perhaps someday these should be
717 implemented as emulations; until then, we just ignore
718 the arguments and hope that nobody ever creates
719 emulations named ips1, ips2 or ips3. */
720 }
721 else if (strcmp (argv[i], "-m486") == 0)
722 {
723 /* FIXME: The argument -m486 is passed to the linker on
724 some Linux systems. Hope that nobody creates an
725 emulation named 486. */
726 }
727 else
728 {
729 /* -mEMUL */
730 emulation = &argv[i][2];
731 }
732 }
733 }
734
735 return emulation;
736 }
737
738 void
add_ysym(const char * name)739 add_ysym (const char *name)
740 {
741 if (link_info.notice_hash == NULL)
742 {
743 link_info.notice_hash
744 = (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
745 if (!bfd_hash_table_init_n (link_info.notice_hash,
746 bfd_hash_newfunc,
747 sizeof (struct bfd_hash_entry),
748 61))
749 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
750 }
751
752 if (bfd_hash_lookup (link_info.notice_hash, name, true, true) == NULL)
753 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
754 }
755
756 void
add_ignoresym(struct bfd_link_info * info,const char * name)757 add_ignoresym (struct bfd_link_info *info, const char *name)
758 {
759 if (info->ignore_hash == NULL)
760 {
761 info->ignore_hash = xmalloc (sizeof (struct bfd_hash_table));
762 if (!bfd_hash_table_init_n (info->ignore_hash,
763 bfd_hash_newfunc,
764 sizeof (struct bfd_hash_entry),
765 61))
766 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
767 }
768
769 if (bfd_hash_lookup (info->ignore_hash, name, true, true) == NULL)
770 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
771 }
772
773 /* Record a symbol to be wrapped, from the --wrap option. */
774
775 void
add_wrap(const char * name)776 add_wrap (const char *name)
777 {
778 if (link_info.wrap_hash == NULL)
779 {
780 link_info.wrap_hash
781 = (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
782 if (!bfd_hash_table_init_n (link_info.wrap_hash,
783 bfd_hash_newfunc,
784 sizeof (struct bfd_hash_entry),
785 61))
786 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
787 }
788
789 if (bfd_hash_lookup (link_info.wrap_hash, name, true, true) == NULL)
790 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
791 }
792
793 /* Handle the -retain-symbols-file option. */
794
795 void
add_keepsyms_file(const char * filename)796 add_keepsyms_file (const char *filename)
797 {
798 FILE *file;
799 char *buf;
800 size_t bufsize;
801 int c;
802
803 if (link_info.strip == strip_some)
804 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
805
806 file = fopen (filename, "r");
807 if (file == NULL)
808 {
809 bfd_set_error (bfd_error_system_call);
810 einfo ("%X%P: %s: %E\n", filename);
811 return;
812 }
813
814 link_info.keep_hash = (struct bfd_hash_table *)
815 xmalloc (sizeof (struct bfd_hash_table));
816 if (!bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc,
817 sizeof (struct bfd_hash_entry)))
818 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
819
820 bufsize = 100;
821 buf = (char *) xmalloc (bufsize);
822
823 c = getc (file);
824 while (c != EOF)
825 {
826 while (ISSPACE (c))
827 c = getc (file);
828
829 if (c != EOF)
830 {
831 size_t len = 0;
832
833 while (!ISSPACE (c) && c != EOF)
834 {
835 buf[len] = c;
836 ++len;
837 if (len >= bufsize)
838 {
839 bufsize *= 2;
840 buf = (char *) xrealloc (buf, bufsize);
841 }
842 c = getc (file);
843 }
844
845 buf[len] = '\0';
846
847 if (bfd_hash_lookup (link_info.keep_hash, buf, true, true) == NULL)
848 einfo (_("%F%P: bfd_hash_lookup for insertion failed: %E\n"));
849 }
850 }
851
852 if (link_info.strip != strip_none)
853 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
854
855 free (buf);
856 link_info.strip = strip_some;
857 fclose (file);
858 }
859
860 /* Callbacks from the BFD linker routines. */
861
862 /* This is called when BFD has decided to include an archive member in
863 a link. */
864
865 static bool
add_archive_element(struct bfd_link_info * info,bfd * abfd,const char * name,bfd ** subsbfd ATTRIBUTE_UNUSED)866 add_archive_element (struct bfd_link_info *info,
867 bfd *abfd,
868 const char *name,
869 bfd **subsbfd ATTRIBUTE_UNUSED)
870 {
871 lang_input_statement_type *input;
872 lang_input_statement_type *parent;
873 lang_input_statement_type orig_input;
874
875 input = (lang_input_statement_type *)
876 xcalloc (1, sizeof (lang_input_statement_type));
877 input->header.type = lang_input_statement_enum;
878 input->filename = bfd_get_filename (abfd);
879 input->local_sym_name = bfd_get_filename (abfd);
880 input->the_bfd = abfd;
881
882 /* Save the original data for trace files/tries below, as plugins
883 (if enabled) may possibly alter it to point to a replacement
884 BFD, but we still want to output the original BFD filename. */
885 orig_input = *input;
886 #if BFD_SUPPORTS_PLUGINS
887 if (link_info.lto_plugin_active)
888 {
889 /* We must offer this archive member to the plugins to claim. */
890 plugin_maybe_claim (input);
891 if (input->flags.claimed)
892 {
893 if (no_more_claiming)
894 {
895 /* Don't claim new IR symbols after all IR symbols have
896 been claimed. */
897 if (verbose)
898 info_msg ("%pI: no new IR symbols to claim\n",
899 &orig_input);
900 input->flags.claimed = 0;
901 return false;
902 }
903 input->flags.claim_archive = true;
904 *subsbfd = input->the_bfd;
905 }
906 }
907 #endif /* BFD_SUPPORTS_PLUGINS */
908
909 if (link_info.input_bfds_tail == &input->the_bfd->link.next
910 || input->the_bfd->link.next != NULL)
911 {
912 /* We have already loaded this element, and are attempting to
913 load it again. This can happen when the archive map doesn't
914 match actual symbols defined by the element. */
915 free (input);
916 bfd_set_error (bfd_error_malformed_archive);
917 return false;
918 }
919
920 /* Set the file_chain pointer of archives to the last element loaded
921 from the archive. See ldlang.c:find_rescan_insertion. */
922 parent = bfd_usrdata (abfd->my_archive);
923 if (parent != NULL && !parent->flags.reload)
924 parent->next = input;
925
926 ldlang_add_file (input);
927
928 if (config.map_file != NULL)
929 {
930 static bool header_printed;
931 struct bfd_link_hash_entry *h;
932 bfd *from;
933 int len;
934
935 h = bfd_link_hash_lookup (info->hash, name, false, false, true);
936 if (h == NULL
937 && info->pei386_auto_import
938 && startswith (name, "__imp_"))
939 h = bfd_link_hash_lookup (info->hash, name + 6, false, false, true);
940
941 if (h == NULL)
942 from = NULL;
943 else
944 {
945 switch (h->type)
946 {
947 default:
948 from = NULL;
949 break;
950
951 case bfd_link_hash_defined:
952 case bfd_link_hash_defweak:
953 from = h->u.def.section->owner;
954 break;
955
956 case bfd_link_hash_undefined:
957 case bfd_link_hash_undefweak:
958 from = h->u.undef.abfd;
959 break;
960
961 case bfd_link_hash_common:
962 from = h->u.c.p->section->owner;
963 break;
964 }
965 }
966
967 if (!header_printed)
968 {
969 minfo (_("Archive member included to satisfy reference by file (symbol)\n\n"));
970 header_printed = true;
971 }
972
973 if (abfd->my_archive == NULL
974 || bfd_is_thin_archive (abfd->my_archive))
975 {
976 minfo ("%s", bfd_get_filename (abfd));
977 len = strlen (bfd_get_filename (abfd));
978 }
979 else
980 {
981 minfo ("%s(%s)", bfd_get_filename (abfd->my_archive),
982 bfd_get_filename (abfd));
983 len = (strlen (bfd_get_filename (abfd->my_archive))
984 + strlen (bfd_get_filename (abfd))
985 + 2);
986 }
987
988 if (len >= 29)
989 {
990 print_nl ();
991 len = 0;
992 }
993 while (len < 30)
994 {
995 print_space ();
996 ++len;
997 }
998
999 if (from != NULL)
1000 minfo ("%pB ", from);
1001 if (h != NULL)
1002 minfo ("(%pT)\n", h->root.string);
1003 else
1004 minfo ("(%s)\n", name);
1005 }
1006
1007 if (verbose
1008 || trace_files > 1
1009 || (trace_files && bfd_is_thin_archive (orig_input.the_bfd->my_archive)))
1010 info_msg ("%pI\n", &orig_input);
1011 return true;
1012 }
1013
1014 /* This is called when BFD has discovered a symbol which is defined
1015 multiple times. */
1016
1017 static void
multiple_definition(struct bfd_link_info * info,struct bfd_link_hash_entry * h,bfd * nbfd,asection * nsec,bfd_vma nval)1018 multiple_definition (struct bfd_link_info *info,
1019 struct bfd_link_hash_entry *h,
1020 bfd *nbfd,
1021 asection *nsec,
1022 bfd_vma nval)
1023 {
1024 const char *name;
1025 bfd *obfd;
1026 asection *osec;
1027 bfd_vma oval;
1028
1029 if (info->allow_multiple_definition)
1030 return;
1031
1032 switch (h->type)
1033 {
1034 case bfd_link_hash_defined:
1035 osec = h->u.def.section;
1036 oval = h->u.def.value;
1037 obfd = h->u.def.section->owner;
1038 break;
1039 case bfd_link_hash_indirect:
1040 osec = bfd_ind_section_ptr;
1041 oval = 0;
1042 obfd = NULL;
1043 break;
1044 default:
1045 abort ();
1046 }
1047
1048 /* Ignore a redefinition of an absolute symbol to the
1049 same value; it's harmless. */
1050 if (h->type == bfd_link_hash_defined
1051 && bfd_is_abs_section (osec)
1052 && bfd_is_abs_section (nsec)
1053 && nval == oval)
1054 return;
1055
1056 /* If either section has the output_section field set to
1057 bfd_abs_section_ptr, it means that the section is being
1058 discarded, and this is not really a multiple definition at all.
1059 FIXME: It would be cleaner to somehow ignore symbols defined in
1060 sections which are being discarded. */
1061 if (!info->prohibit_multiple_definition_absolute
1062 && ((osec->output_section != NULL
1063 && ! bfd_is_abs_section (osec)
1064 && bfd_is_abs_section (osec->output_section))
1065 || (nsec->output_section != NULL
1066 && !bfd_is_abs_section (nsec)
1067 && bfd_is_abs_section (nsec->output_section))))
1068 return;
1069
1070 name = h->root.string;
1071 if (nbfd == NULL)
1072 {
1073 nbfd = obfd;
1074 nsec = osec;
1075 nval = oval;
1076 obfd = NULL;
1077 }
1078 if (info->warn_multiple_definition)
1079 einfo (_("%P: %C: warning: multiple definition of `%pT'"),
1080 nbfd, nsec, nval, name);
1081 else
1082 einfo (_("%X%P: %C: multiple definition of `%pT'"),
1083 nbfd, nsec, nval, name);
1084 if (obfd != NULL)
1085 einfo (_("; %D: first defined here"), obfd, osec, oval);
1086 einfo ("\n");
1087
1088 if (RELAXATION_ENABLED_BY_USER)
1089 {
1090 einfo (_("%P: disabling relaxation; it will not work with multiple definitions\n"));
1091 DISABLE_RELAXATION;
1092 }
1093 }
1094
1095 /* This is called when there is a definition of a common symbol, or
1096 when a common symbol is found for a symbol that is already defined,
1097 or when two common symbols are found. We only do something if
1098 -warn-common was used. */
1099
1100 static void
multiple_common(struct bfd_link_info * info ATTRIBUTE_UNUSED,struct bfd_link_hash_entry * h,bfd * nbfd,enum bfd_link_hash_type ntype,bfd_vma nsize)1101 multiple_common (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1102 struct bfd_link_hash_entry *h,
1103 bfd *nbfd,
1104 enum bfd_link_hash_type ntype,
1105 bfd_vma nsize)
1106 {
1107 const char *name;
1108 bfd *obfd;
1109 enum bfd_link_hash_type otype;
1110 bfd_vma osize;
1111
1112 if (!config.warn_common)
1113 return;
1114
1115 name = h->root.string;
1116 otype = h->type;
1117 if (otype == bfd_link_hash_common)
1118 {
1119 obfd = h->u.c.p->section->owner;
1120 osize = h->u.c.size;
1121 }
1122 else if (otype == bfd_link_hash_defined
1123 || otype == bfd_link_hash_defweak)
1124 {
1125 obfd = h->u.def.section->owner;
1126 osize = 0;
1127 }
1128 else
1129 {
1130 /* FIXME: It would nice if we could report the BFD which defined
1131 an indirect symbol, but we don't have anywhere to store the
1132 information. */
1133 obfd = NULL;
1134 osize = 0;
1135 }
1136
1137 if (ntype == bfd_link_hash_defined
1138 || ntype == bfd_link_hash_defweak
1139 || ntype == bfd_link_hash_indirect)
1140 {
1141 ASSERT (otype == bfd_link_hash_common);
1142 if (obfd != NULL)
1143 einfo (_("%P: %pB: warning: definition of `%pT' overriding common"
1144 " from %pB\n"),
1145 nbfd, name, obfd);
1146 else
1147 einfo (_("%P: %pB: warning: definition of `%pT' overriding common\n"),
1148 nbfd, name);
1149 }
1150 else if (otype == bfd_link_hash_defined
1151 || otype == bfd_link_hash_defweak
1152 || otype == bfd_link_hash_indirect)
1153 {
1154 ASSERT (ntype == bfd_link_hash_common);
1155 if (obfd != NULL)
1156 einfo (_("%P: %pB: warning: common of `%pT' overridden by definition"
1157 " from %pB\n"),
1158 nbfd, name, obfd);
1159 else
1160 einfo (_("%P: %pB: warning: common of `%pT' overridden by definition\n"),
1161 nbfd, name);
1162 }
1163 else
1164 {
1165 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
1166 if (osize > nsize)
1167 {
1168 if (obfd != NULL)
1169 einfo (_("%P: %pB: warning: common of `%pT' overridden"
1170 " by larger common from %pB\n"),
1171 nbfd, name, obfd);
1172 else
1173 einfo (_("%P: %pB: warning: common of `%pT' overridden"
1174 " by larger common\n"),
1175 nbfd, name);
1176 }
1177 else if (nsize > osize)
1178 {
1179 if (obfd != NULL)
1180 einfo (_("%P: %pB: warning: common of `%pT' overriding"
1181 " smaller common from %pB\n"),
1182 nbfd, name, obfd);
1183 else
1184 einfo (_("%P: %pB: warning: common of `%pT' overriding"
1185 " smaller common\n"),
1186 nbfd, name);
1187 }
1188 else
1189 {
1190 if (obfd != NULL)
1191 einfo (_("%P: %pB and %pB: warning: multiple common of `%pT'\n"),
1192 nbfd, obfd, name);
1193 else
1194 einfo (_("%P: %pB: warning: multiple common of `%pT'\n"),
1195 nbfd, name);
1196 }
1197 }
1198 }
1199
1200 /* This is called when BFD has discovered a set element. H is the
1201 entry in the linker hash table for the set. SECTION and VALUE
1202 represent a value which should be added to the set. */
1203
1204 static void
add_to_set(struct bfd_link_info * info ATTRIBUTE_UNUSED,struct bfd_link_hash_entry * h,bfd_reloc_code_real_type reloc,bfd * abfd,asection * section,bfd_vma value)1205 add_to_set (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1206 struct bfd_link_hash_entry *h,
1207 bfd_reloc_code_real_type reloc,
1208 bfd *abfd,
1209 asection *section,
1210 bfd_vma value)
1211 {
1212 if (config.warn_constructors)
1213 einfo (_("%P: warning: global constructor %s used\n"),
1214 h->root.string);
1215
1216 if (!config.build_constructors)
1217 return;
1218
1219 ldctor_add_set_entry (h, reloc, NULL, section, value);
1220
1221 if (h->type == bfd_link_hash_new)
1222 {
1223 h->type = bfd_link_hash_undefined;
1224 h->u.undef.abfd = abfd;
1225 /* We don't call bfd_link_add_undef to add this to the list of
1226 undefined symbols because we are going to define it
1227 ourselves. */
1228 }
1229 }
1230
1231 /* This is called when BFD has discovered a constructor. This is only
1232 called for some object file formats--those which do not handle
1233 constructors in some more clever fashion. This is similar to
1234 adding an element to a set, but less general. */
1235
1236 static void
constructor_callback(struct bfd_link_info * info,bool constructor,const char * name,bfd * abfd,asection * section,bfd_vma value)1237 constructor_callback (struct bfd_link_info *info,
1238 bool constructor,
1239 const char *name,
1240 bfd *abfd,
1241 asection *section,
1242 bfd_vma value)
1243 {
1244 char *s;
1245 struct bfd_link_hash_entry *h;
1246 char set_name[1 + sizeof "__CTOR_LIST__"];
1247
1248 if (config.warn_constructors)
1249 einfo (_("%P: warning: global constructor %s used\n"), name);
1250
1251 if (!config.build_constructors)
1252 return;
1253
1254 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1255 useful error message. */
1256 if (bfd_reloc_type_lookup (info->output_bfd, BFD_RELOC_CTOR) == NULL
1257 && (bfd_link_relocatable (info)
1258 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1259 einfo (_("%F%P: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1260
1261 s = set_name;
1262 if (bfd_get_symbol_leading_char (abfd) != '\0')
1263 *s++ = bfd_get_symbol_leading_char (abfd);
1264 if (constructor)
1265 strcpy (s, "__CTOR_LIST__");
1266 else
1267 strcpy (s, "__DTOR_LIST__");
1268
1269 h = bfd_link_hash_lookup (info->hash, set_name, true, true, true);
1270 if (h == (struct bfd_link_hash_entry *) NULL)
1271 einfo (_("%F%P: bfd_link_hash_lookup failed: %E\n"));
1272 if (h->type == bfd_link_hash_new)
1273 {
1274 h->type = bfd_link_hash_undefined;
1275 h->u.undef.abfd = abfd;
1276 /* We don't call bfd_link_add_undef to add this to the list of
1277 undefined symbols because we are going to define it
1278 ourselves. */
1279 }
1280
1281 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1282 }
1283
1284 /* A structure used by warning_callback to pass information through
1285 bfd_map_over_sections. */
1286
1287 struct warning_callback_info
1288 {
1289 bool found;
1290 const char *warning;
1291 const char *symbol;
1292 asymbol **asymbols;
1293 };
1294
1295 /* Look through the relocs to see if we can find a plausible address
1296 for SYMBOL in ABFD. Return TRUE if found. Otherwise return FALSE. */
1297
1298 static bool
symbol_warning(const char * warning,const char * symbol,bfd * abfd)1299 symbol_warning (const char *warning, const char *symbol, bfd *abfd)
1300 {
1301 struct warning_callback_info cinfo;
1302
1303 if (!bfd_generic_link_read_symbols (abfd))
1304 einfo (_("%F%P: %pB: could not read symbols: %E\n"), abfd);
1305
1306 cinfo.found = false;
1307 cinfo.warning = warning;
1308 cinfo.symbol = symbol;
1309 cinfo.asymbols = bfd_get_outsymbols (abfd);
1310 bfd_map_over_sections (abfd, warning_find_reloc, &cinfo);
1311 return cinfo.found;
1312 }
1313
1314 /* This is called when there is a reference to a warning symbol. */
1315
1316 static void
warning_callback(struct bfd_link_info * info ATTRIBUTE_UNUSED,const char * warning,const char * symbol,bfd * abfd,asection * section,bfd_vma address)1317 warning_callback (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1318 const char *warning,
1319 const char *symbol,
1320 bfd *abfd,
1321 asection *section,
1322 bfd_vma address)
1323 {
1324 /* This is a hack to support warn_multiple_gp. FIXME: This should
1325 have a cleaner interface, but what? */
1326 if (!config.warn_multiple_gp
1327 && strcmp (warning, "using multiple gp values") == 0)
1328 return;
1329
1330 if (section != NULL)
1331 einfo ("%P: %C: %s%s\n", abfd, section, address, _("warning: "), warning);
1332 else if (abfd == NULL)
1333 einfo ("%P: %s%s\n", _("warning: "), warning);
1334 else if (symbol == NULL)
1335 einfo ("%P: %pB: %s%s\n", abfd, _("warning: "), warning);
1336 else if (!symbol_warning (warning, symbol, abfd))
1337 {
1338 bfd *b;
1339 /* Search all input files for a reference to SYMBOL. */
1340 for (b = info->input_bfds; b; b = b->link.next)
1341 if (b != abfd && symbol_warning (warning, symbol, b))
1342 return;
1343 einfo ("%P: %pB: %s%s\n", abfd, _("warning: "), warning);
1344 }
1345 }
1346
1347 /* This is called by warning_callback for each section. It checks the
1348 relocs of the section to see if it can find a reference to the
1349 symbol which triggered the warning. If it can, it uses the reloc
1350 to give an error message with a file and line number. */
1351
1352 static void
warning_find_reloc(bfd * abfd,asection * sec,void * iarg)1353 warning_find_reloc (bfd *abfd, asection *sec, void *iarg)
1354 {
1355 struct warning_callback_info *info = (struct warning_callback_info *) iarg;
1356 long relsize;
1357 arelent **relpp;
1358 long relcount;
1359 arelent **p, **pend;
1360
1361 if (info->found)
1362 return;
1363
1364 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1365 if (relsize < 0)
1366 einfo (_("%F%P: %pB: could not read relocs: %E\n"), abfd);
1367 if (relsize == 0)
1368 return;
1369
1370 relpp = (arelent **) xmalloc (relsize);
1371 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1372 if (relcount < 0)
1373 einfo (_("%F%P: %pB: could not read relocs: %E\n"), abfd);
1374
1375 p = relpp;
1376 pend = p + relcount;
1377 for (; p < pend && *p != NULL; p++)
1378 {
1379 arelent *q = *p;
1380
1381 if (q->sym_ptr_ptr != NULL
1382 && *q->sym_ptr_ptr != NULL
1383 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1384 {
1385 /* We found a reloc for the symbol we are looking for. */
1386 einfo ("%P: %C: %s%s\n", abfd, sec, q->address, _("warning: "),
1387 info->warning);
1388 info->found = true;
1389 break;
1390 }
1391 }
1392
1393 free (relpp);
1394 }
1395
1396 #if SUPPORT_ERROR_HANDLING_SCRIPT
1397 char * error_handling_script = NULL;
1398 #endif
1399
1400 /* This is called when an undefined symbol is found. */
1401
1402 static void
undefined_symbol(struct bfd_link_info * info,const char * name,bfd * abfd,asection * section,bfd_vma address,bool error)1403 undefined_symbol (struct bfd_link_info *info,
1404 const char *name,
1405 bfd *abfd,
1406 asection *section,
1407 bfd_vma address,
1408 bool error)
1409 {
1410 static char *error_name;
1411 static unsigned int error_count;
1412
1413 #define MAX_ERRORS_IN_A_ROW 5
1414
1415 if (info->ignore_hash != NULL
1416 && bfd_hash_lookup (info->ignore_hash, name, false, false) != NULL)
1417 return;
1418
1419 if (config.warn_once)
1420 {
1421 /* Only warn once about a particular undefined symbol. */
1422 add_ignoresym (info, name);
1423 }
1424
1425 /* We never print more than a reasonable number of errors in a row
1426 for a single symbol. */
1427 if (error_name != NULL
1428 && strcmp (name, error_name) == 0)
1429 ++error_count;
1430 else
1431 {
1432 error_count = 0;
1433 free (error_name);
1434 error_name = xstrdup (name);
1435 }
1436
1437 #if SUPPORT_ERROR_HANDLING_SCRIPT
1438 if (error_handling_script != NULL
1439 && error_count < MAX_ERRORS_IN_A_ROW)
1440 {
1441 char * argv[4];
1442 const char * res;
1443 int status, err;
1444
1445 argv[0] = error_handling_script;
1446 argv[1] = "undefined-symbol";
1447 argv[2] = (char *) name;
1448 argv[3] = NULL;
1449
1450 if (verbose)
1451 einfo (_("%P: About to run error handling script '%s' with arguments: '%s' '%s'\n"),
1452 argv[0], argv[1], argv[2]);
1453
1454 res = pex_one (PEX_SEARCH, error_handling_script, argv,
1455 N_("error handling script"),
1456 NULL /* Send stdout to random, temp file. */,
1457 NULL /* Write to stderr. */,
1458 &status, &err);
1459 if (res != NULL)
1460 {
1461 einfo (_("%P: Failed to run error handling script '%s', reason: "),
1462 error_handling_script);
1463 /* FIXME: We assume here that errrno == err. */
1464 perror (res);
1465 }
1466 /* We ignore the return status of the script and
1467 carry on to issue the normal error message. */
1468 }
1469 #endif /* SUPPORT_ERROR_HANDLING_SCRIPT */
1470
1471 if (section != NULL)
1472 {
1473 if (error_count < MAX_ERRORS_IN_A_ROW)
1474 {
1475 if (error)
1476 einfo (_("%X%P: %C: undefined reference to `%pT'\n"),
1477 abfd, section, address, name);
1478 else
1479 einfo (_("%P: %C: warning: undefined reference to `%pT'\n"),
1480 abfd, section, address, name);
1481 }
1482 else if (error_count == MAX_ERRORS_IN_A_ROW)
1483 {
1484 if (error)
1485 einfo (_("%X%P: %D: more undefined references to `%pT' follow\n"),
1486 abfd, section, address, name);
1487 else
1488 einfo (_("%P: %D: warning: more undefined references to `%pT' follow\n"),
1489 abfd, section, address, name);
1490 }
1491 else if (error)
1492 einfo ("%X");
1493 }
1494 else
1495 {
1496 if (error_count < MAX_ERRORS_IN_A_ROW)
1497 {
1498 if (error)
1499 einfo (_("%X%P: %pB: undefined reference to `%pT'\n"),
1500 abfd, name);
1501 else
1502 einfo (_("%P: %pB: warning: undefined reference to `%pT'\n"),
1503 abfd, name);
1504 }
1505 else if (error_count == MAX_ERRORS_IN_A_ROW)
1506 {
1507 if (error)
1508 einfo (_("%X%P: %pB: more undefined references to `%pT' follow\n"),
1509 abfd, name);
1510 else
1511 einfo (_("%P: %pB: warning: more undefined references to `%pT' follow\n"),
1512 abfd, name);
1513 }
1514 else if (error)
1515 einfo ("%X");
1516 }
1517 }
1518
1519 /* Counter to limit the number of relocation overflow error messages
1520 to print. Errors are printed as it is decremented. When it's
1521 called and the counter is zero, a final message is printed
1522 indicating more relocations were omitted. When it gets to -1, no
1523 such errors are printed. If it's initially set to a value less
1524 than -1, all such errors will be printed (--verbose does this). */
1525
1526 int overflow_cutoff_limit = 10;
1527
1528 /* This is called when a reloc overflows. */
1529
1530 static void
reloc_overflow(struct bfd_link_info * info,struct bfd_link_hash_entry * entry,const char * name,const char * reloc_name,bfd_vma addend,bfd * abfd,asection * section,bfd_vma address)1531 reloc_overflow (struct bfd_link_info *info,
1532 struct bfd_link_hash_entry *entry,
1533 const char *name,
1534 const char *reloc_name,
1535 bfd_vma addend,
1536 bfd *abfd,
1537 asection *section,
1538 bfd_vma address)
1539 {
1540 if (overflow_cutoff_limit == -1)
1541 return;
1542
1543 einfo ("%X%H:", abfd, section, address);
1544
1545 if (overflow_cutoff_limit >= 0
1546 && overflow_cutoff_limit-- == 0)
1547 {
1548 einfo (_(" additional relocation overflows omitted from the output\n"));
1549 return;
1550 }
1551
1552 if (entry)
1553 {
1554 while (entry->type == bfd_link_hash_indirect
1555 || entry->type == bfd_link_hash_warning)
1556 entry = entry->u.i.link;
1557 switch (entry->type)
1558 {
1559 case bfd_link_hash_undefined:
1560 case bfd_link_hash_undefweak:
1561 einfo (_(" relocation truncated to fit: "
1562 "%s against undefined symbol `%pT'"),
1563 reloc_name, entry->root.string);
1564 break;
1565 case bfd_link_hash_defined:
1566 case bfd_link_hash_defweak:
1567 einfo (_(" relocation truncated to fit: "
1568 "%s against symbol `%pT' defined in %pA section in %pB"),
1569 reloc_name, entry->root.string,
1570 entry->u.def.section,
1571 entry->u.def.section == bfd_abs_section_ptr
1572 ? info->output_bfd : entry->u.def.section->owner);
1573 break;
1574 default:
1575 abort ();
1576 break;
1577 }
1578 }
1579 else
1580 einfo (_(" relocation truncated to fit: %s against `%pT'"),
1581 reloc_name, name);
1582 if (addend != 0)
1583 einfo ("+%v", addend);
1584 einfo ("\n");
1585 }
1586
1587 /* This is called when a dangerous relocation is made. */
1588
1589 static void
reloc_dangerous(struct bfd_link_info * info ATTRIBUTE_UNUSED,const char * message,bfd * abfd,asection * section,bfd_vma address)1590 reloc_dangerous (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1591 const char *message,
1592 bfd *abfd,
1593 asection *section,
1594 bfd_vma address)
1595 {
1596 einfo (_("%X%H: dangerous relocation: %s\n"),
1597 abfd, section, address, message);
1598 }
1599
1600 /* This is called when a reloc is being generated attached to a symbol
1601 that is not being output. */
1602
1603 static void
unattached_reloc(struct bfd_link_info * info ATTRIBUTE_UNUSED,const char * name,bfd * abfd,asection * section,bfd_vma address)1604 unattached_reloc (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1605 const char *name,
1606 bfd *abfd,
1607 asection *section,
1608 bfd_vma address)
1609 {
1610 einfo (_("%X%H: reloc refers to symbol `%pT' which is not being output\n"),
1611 abfd, section, address, name);
1612 }
1613
1614 /* This is called if link_info.notice_all is set, or when a symbol in
1615 link_info.notice_hash is found. Symbols are put in notice_hash
1616 using the -y option, while notice_all is set if the --cref option
1617 has been supplied, or if there are any NOCROSSREFS sections in the
1618 linker script; and if plugins are active, since they need to monitor
1619 all references from non-IR files. */
1620
1621 static bool
notice(struct bfd_link_info * info,struct bfd_link_hash_entry * h,struct bfd_link_hash_entry * inh ATTRIBUTE_UNUSED,bfd * abfd,asection * section,bfd_vma value,flagword flags ATTRIBUTE_UNUSED)1622 notice (struct bfd_link_info *info,
1623 struct bfd_link_hash_entry *h,
1624 struct bfd_link_hash_entry *inh ATTRIBUTE_UNUSED,
1625 bfd *abfd,
1626 asection *section,
1627 bfd_vma value,
1628 flagword flags ATTRIBUTE_UNUSED)
1629 {
1630 const char *name;
1631
1632 if (h == NULL)
1633 {
1634 if (command_line.cref || nocrossref_list != NULL)
1635 return handle_asneeded_cref (abfd, (enum notice_asneeded_action) value);
1636 return true;
1637 }
1638
1639 name = h->root.string;
1640 if (info->notice_hash != NULL
1641 && bfd_hash_lookup (info->notice_hash, name, false, false) != NULL)
1642 {
1643 if (bfd_is_und_section (section))
1644 einfo (_("%P: %pB: reference to %s\n"), abfd, name);
1645 else
1646 einfo (_("%P: %pB: definition of %s\n"), abfd, name);
1647 }
1648
1649 if (command_line.cref || nocrossref_list != NULL)
1650 add_cref (name, abfd, section, value);
1651
1652 return true;
1653 }
1654