1 /* Copyright (C) 1991, 1993 Free Software Foundation, Inc.
2 Written by Steve Chamberlain steve@cygnus.com
4 This file is part of GLD, the Gnu Linker.
6 GLD 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 2, or (at your option)
11 GLD 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.
16 You should have received a copy of the GNU General Public License
17 along with GLD; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
39 /* Somewhere above, sys/stat.h got included . . . . */
40 #if !defined(S_ISDIR) && defined(S_IFDIR)
41 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
46 static char *get_emulation
PARAMS ((int, char **));
47 static void set_scripts_dir
PARAMS ((void));
52 const char *output_filename
= "a.out";
54 /* Name this program was invoked by. */
57 /* The file that we're creating */
60 /* Set by -G argument, for MIPS ECOFF target. */
61 int g_switch_value
= 8;
63 /* Nonzero means print names of input files as processed. */
66 /* Nonzero means same, but note open failures, too. */
67 boolean trace_file_tries
;
69 /* 1 => write load map. */
72 args_type command_line
;
74 ld_config_type config
;
76 static boolean check_for_scripts_dir
PARAMS ((char *dir
));
77 static boolean add_archive_element
PARAMS ((struct bfd_link_info
*, bfd
*,
79 static boolean multiple_definition
PARAMS ((struct bfd_link_info
*,
81 bfd
*, asection
*, bfd_vma
,
82 bfd
*, asection
*, bfd_vma
));
83 static boolean multiple_common
PARAMS ((struct bfd_link_info
*,
85 enum bfd_link_hash_type
, bfd_vma
,
86 bfd
*, enum bfd_link_hash_type
,
88 static boolean add_to_set
PARAMS ((struct bfd_link_info
*,
89 struct bfd_link_hash_entry
*,
91 bfd
*, asection
*, bfd_vma
));
92 static boolean constructor_callback
PARAMS ((struct bfd_link_info
*,
96 bfd
*, asection
*, bfd_vma
));
97 static boolean warning_callback
PARAMS ((struct bfd_link_info
*,
99 static boolean undefined_symbol
PARAMS ((struct bfd_link_info
*,
101 asection
*, bfd_vma
));
102 static boolean reloc_overflow
PARAMS ((struct bfd_link_info
*, const char *,
103 const char *, bfd_vma
,
104 bfd
*, asection
*, bfd_vma
));
105 static boolean reloc_dangerous
PARAMS ((struct bfd_link_info
*, const char *,
106 bfd
*, asection
*, bfd_vma
));
107 static boolean unattached_reloc
PARAMS ((struct bfd_link_info
*,
108 const char *, bfd
*, asection
*,
110 static boolean notice_ysym
PARAMS ((struct bfd_link_info
*, const char *,
111 bfd
*, asection
*, bfd_vma
));
113 static struct bfd_link_callbacks link_callbacks
=
119 constructor_callback
,
128 struct bfd_link_info link_info
;
130 extern int main
PARAMS ((int, char **));
139 program_name
= argv
[0];
143 /* Initialize the data about options. */
144 trace_files
= trace_file_tries
= false;
146 config
.build_constructors
= true;
147 command_line
.force_common_definition
= false;
149 link_info
.callbacks
= &link_callbacks
;
150 link_info
.relocateable
= false;
151 link_info
.strip
= strip_none
;
152 link_info
.discard
= discard_none
;
153 link_info
.lprefix_len
= 1;
154 link_info
.lprefix
= "L";
155 link_info
.keep_memory
= true;
156 link_info
.input_bfds
= NULL
;
157 link_info
.create_object_symbols_section
= NULL
;
158 link_info
.hash
= NULL
;
159 link_info
.keep_hash
= NULL
;
160 link_info
.notice_hash
= NULL
;
162 ldfile_add_arch ("");
164 config
.make_executable
= true;
165 force_make_executable
= false;
166 config
.magic_demand_paged
= true;
167 config
.text_read_only
= true;
168 config
.make_executable
= true;
170 emulation
= get_emulation (argc
, argv
);
171 ldemul_choose_mode (emulation
);
172 default_target
= ldemul_choose_target ();
174 ldemul_before_parse ();
175 lang_has_input_file
= false;
176 parse_args (argc
, argv
);
178 /* This essentially adds another -L directory so this must be done after
179 the -L's in argv have been processed. */
182 if (had_script
== false)
184 /* Read the emulation's appropriate default script. */
186 char *s
= ldemul_get_script (&isfile
);
190 /* sizeof counts the terminating NUL. */
191 size_t size
= strlen (s
) + sizeof ("-T ");
192 char *buf
= (char *) ldmalloc(size
);
193 sprintf (buf
, "-T %s", s
);
201 if (link_info
.relocateable
&& command_line
.relax
)
203 einfo ("%P%F: -relax and -r may not be used together\n");
207 if (lang_has_input_file
== false)
209 einfo ("%P%F: no input files\n");
214 info_msg ("%P: mode %s\n", emulation
);
217 ldemul_after_parse ();
220 if (config
.map_filename
)
222 if (strcmp (config
.map_filename
, "-") == 0)
224 config
.map_file
= stdout
;
228 config
.map_file
= fopen (config
.map_filename
, FOPEN_WT
);
229 if (config
.map_file
== (FILE *) NULL
)
231 einfo ("%P%F: cannot open map file %s: %E\n",
232 config
.map_filename
);
240 /* Print error messages for any missing symbols, for any warning
241 symbols, and possibly multiple definitions */
244 if (config
.text_read_only
)
246 /* Look for a text section and mark the readonly attribute in it */
247 asection
*found
= bfd_get_section_by_name (output_bfd
, ".text");
249 if (found
!= (asection
*) NULL
)
251 found
->flags
|= SEC_READONLY
;
255 if (link_info
.relocateable
)
256 output_bfd
->flags
&= ~EXEC_P
;
258 output_bfd
->flags
|= EXEC_P
;
262 /* Even if we're producing relocateable output, some non-fatal errors should
263 be reported in the exit status. (What non-fatal errors, if any, do we
264 want to ignore for relocateable output?) */
266 if (config
.make_executable
== false && force_make_executable
== false)
268 if (trace_files
== true)
270 einfo ("%P: link errors found, deleting executable `%s'\n",
274 if (output_bfd
->iostream
)
275 fclose ((FILE *) (output_bfd
->iostream
));
277 unlink (output_filename
);
282 bfd_close (output_bfd
);
287 extern char **environ
;
288 char *lim
= (char *) sbrk (0);
290 fprintf (stderr
, "%s: data size %ld\n", program_name
,
291 (long) (lim
- (char *) &environ
));
298 /* We need to find any explicitly given emulation in order to initialize the
299 state that's needed by the lex&yacc argument parser (parse_args). */
302 get_emulation (argc
, argv
)
309 emulation
= (char *) getenv (EMULATION_ENVIRON
);
310 if (emulation
== NULL
)
311 emulation
= DEFAULT_EMULATION
;
313 for (i
= 1; i
< argc
; i
++)
315 if (!strncmp (argv
[i
], "-m", 2))
317 if (argv
[i
][2] == '\0')
322 emulation
= argv
[i
+ 1];
327 einfo("%P%F: missing argument to -m\n");
330 else if (strcmp (argv
[i
], "-mips1") == 0
331 || strcmp (argv
[i
], "-mips2") == 0
332 || strcmp (argv
[i
], "-mips3") == 0)
334 /* FIXME: The arguments -mips1, -mips2 and -mips3 are
335 passed to the linker by some MIPS compilers. They
336 generally tell the linker to use a slightly different
337 library path. Perhaps someday these should be
338 implemented as emulations; until then, we just ignore
339 the arguments and hope that nobody ever creates
340 emulations named ips1, ips2 or ips3. */
345 emulation
= &argv
[i
][2];
353 /* If directory DIR contains an "ldscripts" subdirectory,
354 add DIR to the library search path and return true,
355 else return false. */
358 check_for_scripts_dir (dir
)
366 dirlen
= strlen (dir
);
367 /* sizeof counts the terminating NUL. */
368 buf
= (char *) ldmalloc (dirlen
+ sizeof("/ldscripts"));
369 sprintf (buf
, "%s/ldscripts", dir
);
371 res
= stat (buf
, &s
) == 0 && S_ISDIR (s
.st_mode
);
374 ldfile_add_library_path (dir
);
378 /* Set the default directory for finding script files.
379 Libraries will be searched for here too, but that's ok.
380 We look for the "ldscripts" directory in:
382 SCRIPTDIR (passed from Makefile)
383 the dir where this program is (for using it from the build tree)
384 the dir where this program is/../lib (for installing the tool suite elsewhere) */
392 if (check_for_scripts_dir (SCRIPTDIR
))
393 return; /* We've been installed normally. */
395 /* Look for "ldscripts" in the dir where our binary is. */
396 end
= strrchr (program_name
, '/');
399 dirlen
= end
- program_name
;
400 /* Make a copy of program_name in dir.
401 Leave room for later "/../lib". */
402 dir
= (char *) ldmalloc (dirlen
+ 8);
403 strncpy (dir
, program_name
, dirlen
);
409 dir
= (char *) ldmalloc (dirlen
+ 8);
413 if (check_for_scripts_dir (dir
))
414 return; /* Don't free dir. */
416 /* Look for "ldscripts" in <the dir where our binary is>/../lib. */
417 strcpy (dir
+ dirlen
, "/../lib");
418 if (check_for_scripts_dir (dir
))
421 free (dir
); /* Well, we tried. */
428 if (link_info
.notice_hash
== (struct bfd_hash_table
*) NULL
)
430 link_info
.notice_hash
= ((struct bfd_hash_table
*)
431 ldmalloc (sizeof (struct bfd_hash_table
)));
432 if (! bfd_hash_table_init_n (link_info
.notice_hash
,
435 einfo ("%P%F: bfd_hash_table_init failed: %E\n");
438 if (bfd_hash_lookup (link_info
.notice_hash
, name
, true, true)
439 == (struct bfd_hash_entry
*) NULL
)
440 einfo ("%P%F: bfd_hash_lookup failed: %E\n");
443 /* Handle the -retain-symbols-file option. */
446 add_keepsyms_file (filename
)
447 const char *filename
;
454 if (link_info
.strip
== strip_some
)
455 einfo ("%X%P: error: duplicate retain-symbols-file\n");
457 file
= fopen (filename
, "r");
458 if (file
== (FILE *) NULL
)
460 bfd_error
= system_call_error
;
461 einfo ("%X%P: %s: %E", filename
);
465 link_info
.keep_hash
= ((struct bfd_hash_table
*)
466 ldmalloc (sizeof (struct bfd_hash_table
)));
467 if (! bfd_hash_table_init (link_info
.keep_hash
, bfd_hash_newfunc
))
468 einfo ("%P%F: bfd_hash_table_init failed: %E\n");
471 buf
= (char *) ldmalloc (bufsize
);
483 while (! isspace (c
) && c
!= EOF
)
490 buf
= ldrealloc (buf
, bufsize
);
497 if (bfd_hash_lookup (link_info
.keep_hash
, buf
, true, true)
498 == (struct bfd_hash_entry
*) NULL
)
499 einfo ("%P%F: bfd_hash_lookup for insertion failed: %E");
503 if (link_info
.strip
!= strip_none
)
504 einfo ("%P: `-retain-symbols-file' overrides `-s' and `-S'\n");
506 link_info
.strip
= strip_some
;
509 /* Callbacks from the BFD linker routines. */
511 /* This is called when BFD has decided to include an archive member in
516 add_archive_element (info
, abfd
, name
)
517 struct bfd_link_info
*info
;
521 lang_input_statement_type
*input
;
523 input
= ((lang_input_statement_type
*)
524 ldmalloc ((bfd_size_type
) sizeof (lang_input_statement_type
)));
525 input
->filename
= abfd
->filename
;
526 input
->local_sym_name
= abfd
->filename
;
527 input
->the_bfd
= abfd
;
528 input
->asymbols
= NULL
;
529 input
->subfiles
= NULL
;
531 input
->just_syms_flag
= false;
532 input
->loaded
= false;
535 /* FIXME: This is wrong. It should point to an entry for the
536 archive itself. However, it doesn't seem to matter. */
537 input
->superfile
= NULL
;
539 /* FIXME: The following fields are not set: header.next,
540 header.type, closed, passive_position, symbol_count, total_size,
541 next_real_file, is_archive, search_dirs_flag, target, real,
542 common_section, common_output_section, complained. This bit of
543 code is from the old decode_library_subfile function. I don't
544 know whether any of those fields matters. */
546 ldlang_add_file (input
);
549 info_msg ("%s needed due to %T\n", abfd
->filename
, name
);
551 if (trace_files
|| trace_file_tries
)
552 info_msg ("%I\n", input
);
557 /* This is called when BFD has discovered a symbol which is defined
562 multiple_definition (info
, name
, obfd
, osec
, oval
, nbfd
, nsec
, nval
)
563 struct bfd_link_info
*info
;
572 einfo ("%X%C: multiple definition of `%T'\n",
573 nbfd
, nsec
, nval
, name
);
574 if (obfd
!= (bfd
*) NULL
)
575 einfo ("%C: first defined here\n", obfd
, osec
, oval
);
579 /* This is called when there is a definition of a common symbol, or
580 when a common symbol is found for a symbol that is already defined,
581 or when two common symbols are found. We only do something if
582 -warn-common was used. */
586 multiple_common (info
, name
, obfd
, otype
, osize
, nbfd
, ntype
, nsize
)
587 struct bfd_link_info
*info
;
590 enum bfd_link_hash_type otype
;
593 enum bfd_link_hash_type ntype
;
596 if (! config
.warn_common
)
599 if (ntype
== bfd_link_hash_defined
)
601 ASSERT (otype
== bfd_link_hash_common
);
602 einfo ("%B: warning: definition of `%T' overriding common\n",
604 einfo ("%B: warning: common is here\n", obfd
);
606 else if (otype
== bfd_link_hash_defined
)
608 ASSERT (ntype
== bfd_link_hash_common
);
609 einfo ("%B: warning: common of `%T' overridden by definition\n",
611 einfo ("%B: warning: defined here\n", obfd
);
615 ASSERT (otype
== bfd_link_hash_common
&& ntype
== bfd_link_hash_common
);
618 einfo ("%B: warning: common of `%T' overridden by larger common\n",
620 einfo ("%B: warning: larger common is here\n", obfd
);
622 else if (nsize
> osize
)
624 einfo ("%B: warning: common of `%T' overriding smaller common\n",
626 einfo ("%B: warning: smaller common is here\n", obfd
);
630 einfo ("%B: warning: multiple common of `%T'\n", nbfd
, name
);
631 einfo ("%B: warning: previous common is here\n", obfd
);
638 /* This is called when BFD has discovered a set element. H is the
639 entry in the linker hash table for the set. SECTION and VALUE
640 represent a value which should be added to the set. */
644 add_to_set (info
, h
, bitsize
, abfd
, section
, value
)
645 struct bfd_link_info
*info
;
646 struct bfd_link_hash_entry
*h
;
647 unsigned int bitsize
;
652 ldctor_add_set_entry (h
, bitsize
, section
, value
);
656 /* This is called when BFD has discovered a constructor. This is only
657 called for some object file formats--those which do not handle
658 constructors in some more clever fashion. This is similar to
659 adding an element to a set, but less general. */
662 constructor_callback (info
, constructor
, bitsize
, name
, abfd
, section
, value
)
663 struct bfd_link_info
*info
;
665 unsigned int bitsize
;
673 struct bfd_link_hash_entry
*h
;
675 if (! config
.build_constructors
)
678 set_name
= (char *) alloca (1 + sizeof "__CTOR_LIST__");
680 if (bfd_get_symbol_leading_char (abfd
) != '\0')
681 *s
++ = bfd_get_symbol_leading_char (abfd
);
683 strcpy (s
, "__CTOR_LIST__");
685 strcpy (s
, "__DTOR_LIST__");
688 info_msg ("Adding %s to constructor/destructor set %s\n", name
, set_name
);
690 h
= bfd_link_hash_lookup (info
->hash
, set_name
, true, true, true);
691 if (h
== (struct bfd_link_hash_entry
*) NULL
)
692 einfo ("%P%F: bfd_link_hash_lookup failed: %E");
693 if (h
->type
== bfd_link_hash_new
)
695 h
->type
= bfd_link_hash_undefined
;
696 h
->u
.undef
.abfd
= abfd
;
697 /* We don't call bfd_link_add_undef to add this to the list of
698 undefined symbols because we are going to define it
702 ldctor_add_set_entry (h
, bitsize
, section
, value
);
706 /* This is called when there is a reference to a warning symbol. */
710 warning_callback (info
, warning
)
711 struct bfd_link_info
*info
;
714 einfo ("%P: %s\n", warning
);
718 /* This is called when an undefined symbol is found. */
722 undefined_symbol (info
, name
, abfd
, section
, address
)
723 struct bfd_link_info
*info
;
729 static char *error_name
;
730 static unsigned int error_count
;
732 #define MAX_ERRORS_IN_A_ROW 5
734 /* We never print more than a reasonable number of errors in a row
735 for a single symbol. */
736 if (error_name
!= (char *) NULL
737 && strcmp (name
, error_name
) == 0)
742 if (error_name
!= (char *) NULL
)
744 error_name
= buystring (name
);
747 if (error_count
< MAX_ERRORS_IN_A_ROW
)
748 einfo ("%X%C: undefined reference to `%T'\n",
749 abfd
, section
, address
, name
);
750 else if (error_count
== MAX_ERRORS_IN_A_ROW
)
751 einfo ("%C: more undefined references to `%T' follow\n",
752 abfd
, section
, address
, name
);
757 /* This is called when a reloc overflows. */
761 reloc_overflow (info
, name
, reloc_name
, addend
, abfd
, section
, address
)
762 struct bfd_link_info
*info
;
764 const char *reloc_name
;
770 einfo ("%X%C: relocation truncated to fit: %s %T", abfd
, section
,
771 address
, reloc_name
, name
);
773 einfo ("+%v", addend
);
778 /* This is called when a dangerous relocation is made. */
782 reloc_dangerous (info
, message
, abfd
, section
, address
)
783 struct bfd_link_info
*info
;
789 einfo ("%X%C: dangerous relocation: %s\n", abfd
, section
, address
, message
);
793 /* This is called when a reloc is being generated attached to a symbol
794 that is not being output. */
798 unattached_reloc (info
, name
, abfd
, section
, address
)
799 struct bfd_link_info
*info
;
805 einfo ("%X%C: reloc refers to symbol `%T' which is not being output\n",
806 abfd
, section
, address
, name
);
810 /* This is called when a symbol in notice_hash is found. Symbols are
811 put in notice_hash using the -y option. */
815 notice_ysym (info
, name
, abfd
, section
, value
)
816 struct bfd_link_info
*info
;
822 einfo ("%B: %s %s\n", abfd
,
823 section
!= &bfd_und_section
? "definition of" : "reference to",