home *** CD-ROM | disk | FTP | other *** search
- /* Main program of GNU linker.
- Copyright (C) 1991, 92, 93, 94, 1995 Free Software Foundation, Inc.
- Written by Steve Chamberlain steve@cygnus.com
-
- This file is part of GLD, the Gnu Linker.
-
- GLD is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- GLD is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with GLD; see the file COPYING. If not, write to
- the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
-
-
- #include "bfd.h"
- #include "sysdep.h"
- #include <stdio.h>
- #include <ctype.h>
- #include "libiberty.h"
- #include "progress.h"
- #include "bfdlink.h"
-
- #include "ld.h"
- #include "ldmain.h"
- #include "ldmisc.h"
- #include "ldwrite.h"
- #include "ldgram.h"
- #include "ldexp.h"
- #include "ldlang.h"
- #include "ldemul.h"
- #include "ldlex.h"
- #include "ldfile.h"
- #include "ldctor.h"
-
- /* Somewhere above, sys/stat.h got included . . . . */
- #if !defined(S_ISDIR) && defined(S_IFDIR)
- #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
- #endif
-
- #include <string.h>
-
- static char *get_emulation PARAMS ((int, char **));
- static void set_scripts_dir PARAMS ((void));
-
- /* EXPORTS */
-
- char *default_target;
- const char *output_filename = "a.out";
-
- /* Name this program was invoked by. */
- char *program_name;
-
- /* The file that we're creating */
- bfd *output_bfd = 0;
-
- /* Set by -G argument, for MIPS ECOFF target. */
- int g_switch_value = 8;
-
- /* Nonzero means print names of input files as processed. */
- boolean trace_files;
-
- /* Nonzero means same, but note open failures, too. */
- boolean trace_file_tries;
-
- /* Nonzero means version number was printed, so exit successfully
- instead of complaining if no input files are given. */
- boolean version_printed;
-
- /* Nonzero means link in every member of an archive. */
- boolean whole_archive;
-
- args_type command_line;
-
- ld_config_type config;
-
- static boolean check_for_scripts_dir PARAMS ((char *dir));
- static boolean add_archive_element PARAMS ((struct bfd_link_info *, bfd *,
- const char *));
- static boolean multiple_definition PARAMS ((struct bfd_link_info *,
- const char *,
- bfd *, asection *, bfd_vma,
- bfd *, asection *, bfd_vma));
- static boolean multiple_common PARAMS ((struct bfd_link_info *,
- const char *, bfd *,
- enum bfd_link_hash_type, bfd_vma,
- bfd *, enum bfd_link_hash_type,
- bfd_vma));
- static boolean add_to_set PARAMS ((struct bfd_link_info *,
- struct bfd_link_hash_entry *,
- bfd_reloc_code_real_type,
- bfd *, asection *, bfd_vma));
- static boolean constructor_callback PARAMS ((struct bfd_link_info *,
- boolean constructor,
- const char *name,
- bfd *, asection *, bfd_vma));
- static boolean warning_callback PARAMS ((struct bfd_link_info *,
- const char *, const char *, bfd *,
- asection *, bfd_vma));
- static void warning_find_reloc PARAMS ((bfd *, asection *, PTR));
- static boolean undefined_symbol PARAMS ((struct bfd_link_info *,
- const char *, bfd *,
- asection *, bfd_vma));
- static boolean reloc_overflow PARAMS ((struct bfd_link_info *, const char *,
- const char *, bfd_vma,
- bfd *, asection *, bfd_vma));
- static boolean reloc_dangerous PARAMS ((struct bfd_link_info *, const char *,
- bfd *, asection *, bfd_vma));
- static boolean unattached_reloc PARAMS ((struct bfd_link_info *,
- const char *, bfd *, asection *,
- bfd_vma));
- static boolean notice PARAMS ((struct bfd_link_info *, const char *,
- bfd *, asection *, bfd_vma));
-
- static struct bfd_link_callbacks link_callbacks =
- {
- add_archive_element,
- multiple_definition,
- multiple_common,
- add_to_set,
- constructor_callback,
- warning_callback,
- undefined_symbol,
- reloc_overflow,
- reloc_dangerous,
- unattached_reloc,
- notice
- };
-
- struct bfd_link_info link_info;
-
- static void
- remove_output ()
- {
- if (output_filename)
- {
- if (output_bfd && output_bfd->iostream)
- fclose((FILE *)(output_bfd->iostream));
- if (delete_output_file_on_failure)
- unlink (output_filename);
- }
- }
-
- int
- main (argc, argv)
- int argc;
- char **argv;
- {
- char *emulation;
- long start_time = get_run_time ();
-
- program_name = argv[0];
- xmalloc_set_program_name (program_name);
-
- START_PROGRESS (program_name, 0);
-
- bfd_init ();
-
- bfd_set_error_program_name (program_name);
-
- xatexit (remove_output);
-
- /* Initialize the data about options. */
- trace_files = trace_file_tries = version_printed = false;
- whole_archive = false;
- config.build_constructors = true;
- config.dynamic_link = false;
- command_line.force_common_definition = false;
- command_line.interpreter = NULL;
- command_line.rpath = NULL;
-
- link_info.callbacks = &link_callbacks;
- link_info.relocateable = false;
- link_info.shared = false;
- link_info.symbolic = false;
- link_info.static_link = false;
- link_info.traditional_format = false;
- link_info.strip = strip_none;
- link_info.discard = discard_none;
- link_info.lprefix_len = 1;
- link_info.lprefix = "L";
- link_info.keep_memory = true;
- link_info.input_bfds = NULL;
- link_info.create_object_symbols_section = NULL;
- link_info.hash = NULL;
- link_info.keep_hash = NULL;
- link_info.notice_all = false;
- link_info.notice_hash = NULL;
- link_info.wrap_hash = NULL;
-
- ldfile_add_arch ("");
-
- config.make_executable = true;
- force_make_executable = false;
- config.magic_demand_paged = true;
- config.text_read_only = true;
- config.make_executable = true;
-
- emulation = get_emulation (argc, argv);
- ldemul_choose_mode (emulation);
- default_target = ldemul_choose_target ();
- lang_init ();
- ldemul_before_parse ();
- lang_has_input_file = false;
- parse_args (argc, argv);
-
- ldemul_set_symbols ();
-
- if (link_info.relocateable)
- {
- if (command_line.relax)
- einfo ("%P%F: -relax and -r may not be used together\n");
- if (link_info.shared)
- einfo ("%P%F: -r and -shared may not be used together\n");
- }
-
- /* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I
- don't see how else this can be handled, since in this case we
- must preserve all externally visible symbols. */
- if (link_info.relocateable && link_info.strip == strip_all)
- {
- link_info.strip = strip_debugger;
- if (link_info.discard == discard_none)
- link_info.discard = discard_all;
- }
-
- /* This essentially adds another -L directory so this must be done after
- the -L's in argv have been processed. */
- set_scripts_dir ();
-
- if (had_script == false)
- {
- /* Read the emulation's appropriate default script. */
- int isfile;
- char *s = ldemul_get_script (&isfile);
-
- if (isfile)
- ldfile_open_command_file (s);
- else
- {
- if (trace_file_tries)
- {
- info_msg ("using internal linker script:\n");
- info_msg ("==================================================\n");
- info_msg (s);
- info_msg ("\n==================================================\n");
- }
- lex_string = s;
- lex_redirect (s);
- }
- parser_input = input_script;
- yyparse ();
- lex_string = NULL;
- }
-
- lang_final ();
-
- if (lang_has_input_file == false)
- {
- if (version_printed)
- xexit (0);
- einfo ("%P%F: no input files\n");
- }
-
- if (trace_files)
- {
- info_msg ("%P: mode %s\n", emulation);
- }
-
- ldemul_after_parse ();
-
-
- if (config.map_filename)
- {
- if (strcmp (config.map_filename, "-") == 0)
- {
- config.map_file = stdout;
- }
- else
- {
- config.map_file = fopen (config.map_filename, FOPEN_WT);
- if (config.map_file == (FILE *) NULL)
- {
- bfd_set_error (bfd_error_system_call);
- einfo ("%P%F: cannot open map file %s: %E\n",
- config.map_filename);
- }
- }
- }
-
-
- lang_process ();
-
- /* Print error messages for any missing symbols, for any warning
- symbols, and possibly multiple definitions */
-
-
- if (config.text_read_only)
- {
- /* Look for a text section and mark the readonly attribute in it */
- asection *found = bfd_get_section_by_name (output_bfd, ".text");
-
- if (found != (asection *) NULL)
- {
- found->flags |= SEC_READONLY;
- }
- }
-
- if (link_info.relocateable)
- output_bfd->flags &= ~EXEC_P;
- else
- output_bfd->flags |= EXEC_P;
-
- ldwrite ();
-
- if (config.map_file != NULL)
- lang_map ();
- if (link_info.notice_all)
- output_cref (config.map_file != NULL ? config.map_file : stdout);
-
- /* Even if we're producing relocateable output, some non-fatal errors should
- be reported in the exit status. (What non-fatal errors, if any, do we
- want to ignore for relocateable output?) */
-
- if (config.make_executable == false && force_make_executable == false)
- {
- if (trace_files == true)
- {
- einfo ("%P: link errors found, deleting executable `%s'\n",
- output_filename);
- }
-
- /* The file will be removed by remove_output. */
-
- xexit (1);
- }
- else
- {
- if (! bfd_close (output_bfd))
- einfo ("%F%B: final close failed: %E\n", output_bfd);
-
- /* If the --force-exe-suffix is enabled, and we're making an
- executable file and it doesn't end in .exe, copy it to one which does. */
-
- if (! link_info.relocateable && command_line.force_exe_suffix)
- {
- int len = strlen (output_filename);
- if (len < 4
- || (strcasecmp (output_filename + len - 4, ".exe") != 0
- && strcasecmp (output_filename + len - 4, ".dll") != 0))
- {
- FILE *src;
- FILE *dst;
- const int bsize = 4096;
- char *buf = xmalloc (bsize);
- int l;
- char *dst_name = xmalloc (len + 5);
- strcpy (dst_name, output_filename);
- strcat (dst_name, ".exe");
- src = fopen (output_filename, FOPEN_RB);
- dst = fopen (dst_name, FOPEN_WB);
-
- if (!src)
- einfo ("%X%P: unable to open for source of copy `%s'\n", output_filename);
- if (!dst)
- einfo ("%X%P: unable to open for destination of copy `%s'\n", dst_name);
- while ((l = fread (buf, 1, bsize, src)) > 0)
- {
- int done = fwrite (buf, 1, l, dst);
- if (done != l)
- {
- einfo ("%P: Error writing file `%s'\n", dst_name);
- }
- }
- fclose (src);
- if (!fclose (dst))
- {
- einfo ("%P: Error closing file `%s'\n", dst_name);
- }
- free (dst_name);
- free (buf);
- }
- }
- }
-
- END_PROGRESS (program_name);
-
- if (config.stats)
- {
- extern char **environ;
- #ifdef HAVE_SBRK
- char *lim = (char *) sbrk (0);
- #endif
- long run_time = get_run_time () - start_time;
-
- fprintf (stderr, "%s: total time in link: %ld.%06ld\n",
- program_name, run_time / 1000000, run_time % 1000000);
- #ifdef HAVE_SBRK
- fprintf (stderr, "%s: data size %ld\n", program_name,
- (long) (lim - (char *) &environ));
- #endif
- }
-
- /* Prevent remove_output from doing anything, after a successful link. */
- output_filename = NULL;
-
- xexit (0);
- return 0;
- }
-
- /* We need to find any explicitly given emulation in order to initialize the
- state that's needed by the lex&yacc argument parser (parse_args). */
-
- static char *
- get_emulation (argc, argv)
- int argc;
- char **argv;
- {
- char *emulation;
- int i;
-
- emulation = (char *) getenv (EMULATION_ENVIRON);
- if (emulation == NULL)
- emulation = DEFAULT_EMULATION;
-
- for (i = 1; i < argc; i++)
- {
- if (!strncmp (argv[i], "-m", 2))
- {
- if (argv[i][2] == '\0')
- {
- /* -m EMUL */
- if (i < argc - 1)
- {
- emulation = argv[i + 1];
- i++;
- }
- else
- {
- einfo("%P%F: missing argument to -m\n");
- }
- }
- else if (strcmp (argv[i], "-mips1") == 0
- || strcmp (argv[i], "-mips2") == 0
- || strcmp (argv[i], "-mips3") == 0)
- {
- /* FIXME: The arguments -mips1, -mips2 and -mips3 are
- passed to the linker by some MIPS compilers. They
- generally tell the linker to use a slightly different
- library path. Perhaps someday these should be
- implemented as emulations; until then, we just ignore
- the arguments and hope that nobody ever creates
- emulations named ips1, ips2 or ips3. */
- }
- else if (strcmp (argv[i], "-m486") == 0)
- {
- /* FIXME: The argument -m486 is passed to the linker on
- some Linux systems. Hope that nobody creates an
- emulation named 486. */
- }
- else
- {
- /* -mEMUL */
- emulation = &argv[i][2];
- }
- }
- }
-
- return emulation;
- }
-
- /* If directory DIR contains an "ldscripts" subdirectory,
- add DIR to the library search path and return true,
- else return false. */
-
- static boolean
- check_for_scripts_dir (dir)
- char *dir;
- {
- size_t dirlen;
- char *buf;
- struct stat s;
- boolean res;
-
- dirlen = strlen (dir);
- /* sizeof counts the terminating NUL. */
- buf = (char *) xmalloc (dirlen + sizeof("/ldscripts"));
- sprintf (buf, "%s/ldscripts", dir);
-
- res = stat (buf, &s) == 0 && S_ISDIR (s.st_mode);
- free (buf);
- if (res)
- ldfile_add_library_path (dir, false);
- return res;
- }
-
- /* Set the default directory for finding script files.
- Libraries will be searched for here too, but that's ok.
- We look for the "ldscripts" directory in:
-
- SCRIPTDIR (passed from Makefile)
- the dir where this program is (for using it from the build tree)
- the dir where this program is/../lib (for installing the tool suite elsewhere) */
-
- static void
- set_scripts_dir ()
- {
- char *end, *dir;
- size_t dirlen;
-
- if (check_for_scripts_dir (SCRIPTDIR))
- return; /* We've been installed normally. */
-
- /* Look for "ldscripts" in the dir where our binary is. */
- end = strrchr (program_name, '/');
-
- if (end == NULL)
- {
- /* Don't look for ldscripts in the current directory. There is
- too much potential for confusion. */
- return;
- }
-
- dirlen = end - program_name;
- /* Make a copy of program_name in dir.
- Leave room for later "/../lib". */
- dir = (char *) xmalloc (dirlen + 8);
- strncpy (dir, program_name, dirlen);
- dir[dirlen] = '\0';
-
- if (check_for_scripts_dir (dir))
- return; /* Don't free dir. */
-
- /* Look for "ldscripts" in <the dir where our binary is>/../lib. */
- strcpy (dir + dirlen, "/../lib");
- if (check_for_scripts_dir (dir))
- return;
-
- free (dir); /* Well, we tried. */
- }
-
- void
- add_ysym (name)
- const char *name;
- {
- if (link_info.notice_hash == (struct bfd_hash_table *) NULL)
- {
- link_info.notice_hash = ((struct bfd_hash_table *)
- xmalloc (sizeof (struct bfd_hash_table)));
- if (! bfd_hash_table_init_n (link_info.notice_hash,
- bfd_hash_newfunc,
- 61))
- einfo ("%P%F: bfd_hash_table_init failed: %E\n");
- }
-
- if (bfd_hash_lookup (link_info.notice_hash, name, true, true)
- == (struct bfd_hash_entry *) NULL)
- einfo ("%P%F: bfd_hash_lookup failed: %E\n");
- }
-
- /* Record a symbol to be wrapped, from the --wrap option. */
-
- void
- add_wrap (name)
- const char *name;
- {
- if (link_info.wrap_hash == NULL)
- {
- link_info.wrap_hash = ((struct bfd_hash_table *)
- xmalloc (sizeof (struct bfd_hash_table)));
- if (! bfd_hash_table_init_n (link_info.wrap_hash,
- bfd_hash_newfunc,
- 61))
- einfo ("%P%F: bfd_hash_table_init failed: %E\n");
- }
- if (bfd_hash_lookup (link_info.wrap_hash, name, true, true) == NULL)
- einfo ("%P%F: bfd_hash_lookup failed: %E\n");
- }
-
- /* Handle the -retain-symbols-file option. */
-
- void
- add_keepsyms_file (filename)
- const char *filename;
- {
- FILE *file;
- char *buf;
- size_t bufsize;
- int c;
-
- if (link_info.strip == strip_some)
- einfo ("%X%P: error: duplicate retain-symbols-file\n");
-
- file = fopen (filename, "r");
- if (file == (FILE *) NULL)
- {
- bfd_set_error (bfd_error_system_call);
- einfo ("%X%P: %s: %E\n", filename);
- return;
- }
-
- link_info.keep_hash = ((struct bfd_hash_table *)
- xmalloc (sizeof (struct bfd_hash_table)));
- if (! bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc))
- einfo ("%P%F: bfd_hash_table_init failed: %E\n");
-
- bufsize = 100;
- buf = (char *) xmalloc (bufsize);
-
- c = getc (file);
- while (c != EOF)
- {
- while (isspace (c))
- c = getc (file);
-
- if (c != EOF)
- {
- size_t len = 0;
-
- while (! isspace (c) && c != EOF)
- {
- buf[len] = c;
- ++len;
- if (len >= bufsize)
- {
- bufsize *= 2;
- buf = xrealloc (buf, bufsize);
- }
- c = getc (file);
- }
-
- buf[len] = '\0';
-
- if (bfd_hash_lookup (link_info.keep_hash, buf, true, true)
- == (struct bfd_hash_entry *) NULL)
- einfo ("%P%F: bfd_hash_lookup for insertion failed: %E\n");
- }
- }
-
- if (link_info.strip != strip_none)
- einfo ("%P: `-retain-symbols-file' overrides `-s' and `-S'\n");
-
- link_info.strip = strip_some;
- }
-
- /* Callbacks from the BFD linker routines. */
-
- /* This is called when BFD has decided to include an archive member in
- a link. */
-
- /*ARGSUSED*/
- static boolean
- add_archive_element (info, abfd, name)
- struct bfd_link_info *info;
- bfd *abfd;
- const char *name;
- {
- lang_input_statement_type *input;
-
- input = ((lang_input_statement_type *)
- xmalloc (sizeof (lang_input_statement_type)));
- input->filename = abfd->filename;
- input->local_sym_name = abfd->filename;
- input->the_bfd = abfd;
- input->asymbols = NULL;
- input->next = NULL;
- input->just_syms_flag = false;
- input->loaded = false;
- input->search_dirs_flag = false;
-
- /* FIXME: The following fields are not set: header.next,
- header.type, closed, passive_position, symbol_count,
- next_real_file, is_archive, target, real. This bit of code is
- from the old decode_library_subfile function. I don't know
- whether any of those fields matters. */
-
- ldlang_add_file (input);
-
- if (config.map_file != (FILE *) NULL)
- {
- static boolean header_printed;
- struct bfd_link_hash_entry *h;
- bfd *from;
- int len;
-
- h = bfd_link_hash_lookup (link_info.hash, name, false, false, true);
-
- if (h == NULL)
- from = NULL;
- else
- {
- switch (h->type)
- {
- default:
- from = NULL;
- break;
-
- case bfd_link_hash_defined:
- case bfd_link_hash_defweak:
- from = h->u.def.section->owner;
- break;
-
- case bfd_link_hash_undefined:
- case bfd_link_hash_undefweak:
- from = h->u.undef.abfd;
- break;
-
- case bfd_link_hash_common:
- from = h->u.c.p->section->owner;
- break;
- }
- }
-
- if (! header_printed)
- {
- char buf[100];
-
- sprintf (buf, "%-29s %s\n\n", "Archive member included",
- "because of file (symbol)");
- minfo ("%s", buf);
- header_printed = true;
- }
-
- if (bfd_my_archive (abfd) == NULL)
- {
- minfo ("%s", bfd_get_filename (abfd));
- len = strlen (bfd_get_filename (abfd));
- }
- else
- {
- minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)),
- bfd_get_filename (abfd));
- len = (strlen (bfd_get_filename (bfd_my_archive (abfd)))
- + strlen (bfd_get_filename (abfd))
- + 2);
- }
-
- if (len >= 29)
- {
- print_nl ();
- len = 0;
- }
- while (len < 30)
- {
- print_space ();
- ++len;
- }
-
- if (from != NULL)
- minfo ("%B ", from);
- if (h != NULL)
- minfo ("(%T)\n", h->root.string);
- else
- minfo ("(%s)\n", name);
- }
-
- if (trace_files || trace_file_tries)
- info_msg ("%I\n", input);
-
- return true;
- }
-
- /* This is called when BFD has discovered a symbol which is defined
- multiple times. */
-
- /*ARGSUSED*/
- static boolean
- multiple_definition (info, name, obfd, osec, oval, nbfd, nsec, nval)
- struct bfd_link_info *info;
- const char *name;
- bfd *obfd;
- asection *osec;
- bfd_vma oval;
- bfd *nbfd;
- asection *nsec;
- bfd_vma nval;
- {
- /* If either section has the output_section field set to
- bfd_abs_section_ptr, it means that the section is being
- discarded, and this is not really a multiple definition at all.
- FIXME: It would be cleaner to somehow ignore symbols defined in
- sections which are being discarded. */
- if ((osec->output_section != NULL
- && bfd_is_abs_section (osec->output_section))
- || (nsec->output_section != NULL
- && bfd_is_abs_section (nsec->output_section)))
- return true;
-
- einfo ("%X%C: multiple definition of `%T'\n",
- nbfd, nsec, nval, name);
- if (obfd != (bfd *) NULL)
- einfo ("%D: first defined here\n", obfd, osec, oval);
- return true;
- }
-
- /* This is called when there is a definition of a common symbol, or
- when a common symbol is found for a symbol that is already defined,
- or when two common symbols are found. We only do something if
- -warn-common was used. */
-
- /*ARGSUSED*/
- static boolean
- multiple_common (info, name, obfd, otype, osize, nbfd, ntype, nsize)
- struct bfd_link_info *info;
- const char *name;
- bfd *obfd;
- enum bfd_link_hash_type otype;
- bfd_vma osize;
- bfd *nbfd;
- enum bfd_link_hash_type ntype;
- bfd_vma nsize;
- {
- if (! config.warn_common)
- return true;
-
- if (ntype == bfd_link_hash_defined
- || ntype == bfd_link_hash_defweak
- || ntype == bfd_link_hash_indirect)
- {
- ASSERT (otype == bfd_link_hash_common);
- einfo ("%B: warning: definition of `%T' overriding common\n",
- nbfd, name);
- if (obfd != NULL)
- einfo ("%B: warning: common is here\n", obfd);
- }
- else if (otype == bfd_link_hash_defined
- || otype == bfd_link_hash_defweak
- || otype == bfd_link_hash_indirect)
- {
- ASSERT (ntype == bfd_link_hash_common);
- einfo ("%B: warning: common of `%T' overridden by definition\n",
- nbfd, name);
- if (obfd != NULL)
- einfo ("%B: warning: defined here\n", obfd);
- }
- else
- {
- ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
- if (osize > nsize)
- {
- einfo ("%B: warning: common of `%T' overridden by larger common\n",
- nbfd, name);
- if (obfd != NULL)
- einfo ("%B: warning: larger common is here\n", obfd);
- }
- else if (nsize > osize)
- {
- einfo ("%B: warning: common of `%T' overriding smaller common\n",
- nbfd, name);
- if (obfd != NULL)
- einfo ("%B: warning: smaller common is here\n", obfd);
- }
- else
- {
- einfo ("%B: warning: multiple common of `%T'\n", nbfd, name);
- if (obfd != NULL)
- einfo ("%B: warning: previous common is here\n", obfd);
- }
- }
-
- return true;
- }
-
- /* This is called when BFD has discovered a set element. H is the
- entry in the linker hash table for the set. SECTION and VALUE
- represent a value which should be added to the set. */
-
- /*ARGSUSED*/
- static boolean
- add_to_set (info, h, reloc, abfd, section, value)
- struct bfd_link_info *info;
- struct bfd_link_hash_entry *h;
- bfd_reloc_code_real_type reloc;
- bfd *abfd;
- asection *section;
- bfd_vma value;
- {
- if (config.warn_constructors)
- einfo ("%P: warning: global constructor %s used\n",
- h->root.string);
-
- if (! config.build_constructors)
- return true;
-
- ldctor_add_set_entry (h, reloc, (const char *) NULL, section, value);
-
- if (h->type == bfd_link_hash_new)
- {
- h->type = bfd_link_hash_undefined;
- h->u.undef.abfd = abfd;
- /* We don't call bfd_link_add_undef to add this to the list of
- undefined symbols because we are going to define it
- ourselves. */
- }
-
- return true;
- }
-
- /* This is called when BFD has discovered a constructor. This is only
- called for some object file formats--those which do not handle
- constructors in some more clever fashion. This is similar to
- adding an element to a set, but less general. */
-
- static boolean
- constructor_callback (info, constructor, name, abfd, section, value)
- struct bfd_link_info *info;
- boolean constructor;
- const char *name;
- bfd *abfd;
- asection *section;
- bfd_vma value;
- {
- char *s;
- struct bfd_link_hash_entry *h;
- char set_name[1 + sizeof "__CTOR_LIST__"];
-
- if (config.warn_constructors)
- einfo ("%P: warning: global constructor %s used\n", name);
-
- if (! config.build_constructors)
- return true;
-
- /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
- useful error message. */
- if (bfd_reloc_type_lookup (output_bfd, BFD_RELOC_CTOR) == NULL
- && (link_info.relocateable
- || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
- einfo ("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n");
-
- s = set_name;
- if (bfd_get_symbol_leading_char (abfd) != '\0')
- *s++ = bfd_get_symbol_leading_char (abfd);
- if (constructor)
- strcpy (s, "__CTOR_LIST__");
- else
- strcpy (s, "__DTOR_LIST__");
-
- h = bfd_link_hash_lookup (info->hash, set_name, true, true, true);
- if (h == (struct bfd_link_hash_entry *) NULL)
- einfo ("%P%F: bfd_link_hash_lookup failed: %E\n");
- if (h->type == bfd_link_hash_new)
- {
- h->type = bfd_link_hash_undefined;
- h->u.undef.abfd = abfd;
- /* We don't call bfd_link_add_undef to add this to the list of
- undefined symbols because we are going to define it
- ourselves. */
- }
-
- ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
- return true;
- }
-
- /* A structure used by warning_callback to pass information through
- bfd_map_over_sections. */
-
- struct warning_callback_info
- {
- boolean found;
- const char *warning;
- const char *symbol;
- asymbol **asymbols;
- };
-
- /* This is called when there is a reference to a warning symbol. */
-
- /*ARGSUSED*/
- static boolean
- warning_callback (info, warning, symbol, abfd, section, address)
- struct bfd_link_info *info;
- const char *warning;
- const char *symbol;
- bfd *abfd;
- asection *section;
- bfd_vma address;
- {
- /* This is a hack to support warn_multiple_gp. FIXME: This should
- have a cleaner interface, but what? */
- if (! config.warn_multiple_gp
- && strcmp (warning, "using multiple gp values") == 0)
- return true;
-
- if (section != NULL)
- einfo ("%C: %s\n", abfd, section, address, warning);
- else if (abfd == NULL)
- einfo ("%P: %s\n", warning);
- else if (symbol == NULL)
- einfo ("%B: %s\n", abfd, warning);
- else
- {
- lang_input_statement_type *entry;
- asymbol **asymbols;
- struct warning_callback_info info;
-
- /* Look through the relocs to see if we can find a plausible
- address. */
-
- entry = (lang_input_statement_type *) abfd->usrdata;
- if (entry != NULL && entry->asymbols != NULL)
- asymbols = entry->asymbols;
- else
- {
- long symsize;
- long symbol_count;
-
- symsize = bfd_get_symtab_upper_bound (abfd);
- if (symsize < 0)
- einfo ("%B%F: could not read symbols: %E\n", abfd);
- asymbols = (asymbol **) xmalloc (symsize);
- symbol_count = bfd_canonicalize_symtab (abfd, asymbols);
- if (symbol_count < 0)
- einfo ("%B%F: could not read symbols: %E\n", abfd);
- if (entry != NULL)
- {
- entry->asymbols = asymbols;
- entry->symbol_count = symbol_count;
- }
- }
-
- info.found = false;
- info.warning = warning;
- info.symbol = symbol;
- info.asymbols = asymbols;
- bfd_map_over_sections (abfd, warning_find_reloc, (PTR) &info);
-
- if (! info.found)
- einfo ("%B: %s\n", abfd, warning);
- }
-
- return true;
- }
-
- /* This is called by warning_callback for each section. It checks the
- relocs of the section to see if it can find a reference to the
- symbol which triggered the warning. If it can, it uses the reloc
- to give an error message with a file and line number. */
-
- static void
- warning_find_reloc (abfd, sec, iarg)
- bfd *abfd;
- asection *sec;
- PTR iarg;
- {
- struct warning_callback_info *info = (struct warning_callback_info *) iarg;
- long relsize;
- arelent **relpp;
- long relcount;
- arelent **p, **pend;
-
- if (info->found)
- return;
-
- relsize = bfd_get_reloc_upper_bound (abfd, sec);
- if (relsize < 0)
- einfo ("%B%F: could not read relocs: %E\n", abfd);
- if (relsize == 0)
- return;
-
- relpp = (arelent **) xmalloc (relsize);
- relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
- if (relcount < 0)
- einfo ("%B%F: could not read relocs: %E\n", abfd);
-
- p = relpp;
- pend = p + relcount;
- for (; p < pend && *p != NULL; p++)
- {
- arelent *q = *p;
-
- if (q->sym_ptr_ptr != NULL
- && *q->sym_ptr_ptr != NULL
- && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
- {
- /* We found a reloc for the symbol we are looking for. */
- einfo ("%C: %s\n", abfd, sec, q->address, info->warning);
- info->found = true;
- break;
- }
- }
-
- free (relpp);
- }
-
- /* This is called when an undefined symbol is found. */
-
- /*ARGSUSED*/
- static boolean
- undefined_symbol (info, name, abfd, section, address)
- struct bfd_link_info *info;
- const char *name;
- bfd *abfd;
- asection *section;
- bfd_vma address;
- {
- static char *error_name;
- static unsigned int error_count;
-
- #define MAX_ERRORS_IN_A_ROW 5
-
- if (config.warn_once)
- {
- static struct bfd_hash_table *hash;
-
- /* Only warn once about a particular undefined symbol. */
-
- if (hash == NULL)
- {
- hash = ((struct bfd_hash_table *)
- xmalloc (sizeof (struct bfd_hash_table)));
- if (! bfd_hash_table_init (hash, bfd_hash_newfunc))
- einfo ("%F%P: bfd_hash_table_init failed: %E\n");
- }
-
- if (bfd_hash_lookup (hash, name, false, false) != NULL)
- return true;
-
- if (bfd_hash_lookup (hash, name, true, true) == NULL)
- einfo ("%F%P: bfd_hash_lookup failed: %E\n");
- }
-
- /* We never print more than a reasonable number of errors in a row
- for a single symbol. */
- if (error_name != (char *) NULL
- && strcmp (name, error_name) == 0)
- ++error_count;
- else
- {
- error_count = 0;
- if (error_name != (char *) NULL)
- free (error_name);
- error_name = buystring (name);
- }
-
- if (section != NULL)
- {
- if (error_count < MAX_ERRORS_IN_A_ROW)
- einfo ("%X%C: undefined reference to `%T'\n",
- abfd, section, address, name);
- else if (error_count == MAX_ERRORS_IN_A_ROW)
- einfo ("%D: more undefined references to `%T' follow\n",
- abfd, section, address, name);
- }
- else
- {
- if (error_count < MAX_ERRORS_IN_A_ROW)
- einfo ("%X%B: undefined reference to `%T'\n",
- abfd, name);
- else if (error_count == MAX_ERRORS_IN_A_ROW)
- einfo ("%B: more undefined references to `%T' follow\n",
- abfd, name);
- }
-
- return true;
- }
-
- /* This is called when a reloc overflows. */
-
- /*ARGSUSED*/
- static boolean
- reloc_overflow (info, name, reloc_name, addend, abfd, section, address)
- struct bfd_link_info *info;
- const char *name;
- const char *reloc_name;
- bfd_vma addend;
- bfd *abfd;
- asection *section;
- bfd_vma address;
- {
- if (abfd == (bfd *) NULL)
- einfo ("%P%X: generated");
- else
- einfo ("%X%C:", abfd, section, address);
- einfo (" relocation truncated to fit: %s %T", reloc_name, name);
- if (addend != 0)
- einfo ("+%v", addend);
- einfo ("\n");
- return true;
- }
-
- /* This is called when a dangerous relocation is made. */
-
- /*ARGSUSED*/
- static boolean
- reloc_dangerous (info, message, abfd, section, address)
- struct bfd_link_info *info;
- const char *message;
- bfd *abfd;
- asection *section;
- bfd_vma address;
- {
- if (abfd == (bfd *) NULL)
- einfo ("%P%X: generated");
- else
- einfo ("%X%C:", abfd, section, address);
- einfo ("dangerous relocation: %s\n", message);
- return true;
- }
-
- /* This is called when a reloc is being generated attached to a symbol
- that is not being output. */
-
- /*ARGSUSED*/
- static boolean
- unattached_reloc (info, name, abfd, section, address)
- struct bfd_link_info *info;
- const char *name;
- bfd *abfd;
- asection *section;
- bfd_vma address;
- {
- if (abfd == (bfd *) NULL)
- einfo ("%P%X: generated");
- else
- einfo ("%X%C:", abfd, section, address);
- einfo (" reloc refers to symbol `%T' which is not being output\n", name);
- return true;
- }
-
- /* This is called if link_info.notice_all is set, or when a symbol in
- link_info.notice_hash is found. Symbols are put in notice_hash
- using the -y option. */
-
- static boolean
- notice (info, name, abfd, section, value)
- struct bfd_link_info *info;
- const char *name;
- bfd *abfd;
- asection *section;
- bfd_vma value;
- {
- if (! info->notice_all
- || (info->notice_hash != NULL
- && bfd_hash_lookup (info->notice_hash, name, false, false) != NULL))
- einfo ("%B: %s %s\n", abfd,
- bfd_is_und_section (section) ? "reference to" : "definition of",
- name);
-
- if (info->notice_all)
- add_cref (name, abfd, section, value);
-
- return true;
- }
-