/* Main program of GNU linker. Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002 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 #include "safe-ctype.h" #include "libiberty.h" #include "progress.h" #include "bfdlink.h" #include "filenames.h" #include "ld.h" #include "ldmain.h" #include "ldmisc.h" #include "ldwrite.h" #include "ldgram.h" #include "ldexp.h" #include "ldlang.h" #include "ldlex.h" #include "ldfile.h" #include "ldemul.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 #ifdef HAVE_SBRK #ifdef NEED_DECLARATION_SBRK extern PTR sbrk (); #endif #endif int main PARAMS ((int, char **)); 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; /* True if we should demangle symbol names. */ boolean demangling; args_type command_line; ld_config_type config; static void remove_output PARAMS ((void)); 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, boolean)); 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 (); #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES) setlocale (LC_MESSAGES, ""); #endif #if defined (HAVE_SETLOCALE) setlocale (LC_CTYPE, ""); #endif bindtextdomain (PACKAGE, LOCALEDIR); textdomain (PACKAGE); 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); /* Set the default BFD target based on the configured target. Doing this permits the linker to be configured for a particular target, and linked against a shared BFD library which was configured for a different target. The macro TARGET is defined by Makefile. */ if (! bfd_set_default_target (TARGET)) { einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET); xexit (1); } #if YYDEBUG { extern int yydebug; yydebug = 1; } #endif /* Initialize the data about options. */ trace_files = trace_file_tries = version_printed = false; whole_archive = false; config.build_constructors = true; config.dynamic_link = false; config.has_shared = false; config.split_by_reloc = (unsigned) -1; config.split_by_file = (bfd_size_type) -1; command_line.force_common_definition = false; command_line.inhibit_common_definition = false; command_line.interpreter = NULL; command_line.rpath = NULL; command_line.warn_mismatch = true; command_line.check_section_addresses = true; /* We initialize DEMANGLING based on the environment variable COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the output of the linker, unless COLLECT_NO_DEMANGLE is set in the environment. Acting the same way here lets us provide the same interface by default. */ demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL; link_info.callbacks = &link_callbacks; link_info.relocateable = false; link_info.emitrelocations = false; link_info.shared = false; link_info.symbolic = false; link_info.export_dynamic = false; link_info.static_link = false; link_info.traditional_format = false; link_info.optimize = false; link_info.no_undefined = false; link_info.allow_shlib_undefined = false; link_info.strip = strip_none; link_info.discard = discard_sec_merge; 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; link_info.mpc860c0 = 0; /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init and _fini symbols. We are compatible. */ link_info.init_function = "_init"; link_info.fini_function = "_fini"; link_info.new_dtags = false; link_info.eh_frame_hdr = false; link_info.flags = (bfd_vma) 0; link_info.flags_1 = (bfd_vma) 0; link_info.pei386_auto_import = false; link_info.combreloc = false; link_info.spare_dynamic_tags = 5; ldfile_add_arch (""); config.make_executable = true; force_make_executable = false; config.magic_demand_paged = true; config.text_read_only = true; emulation = get_emulation (argc, argv); ldemul_choose_mode (emulation); default_target = ldemul_choose_target (argc, argv); lang_init (); ldemul_before_parse (); lang_has_input_file = false; parse_args (argc, argv); ldemul_set_symbols (); if (link_info.relocateable) { if (command_line.gc_sections) einfo ("%P%F: --gc-sections and -r may not be used together\n"); if (link_info.mpc860c0) einfo (_("%P%F: -r and --mpc860c0 may not be used together\n")); else 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")); } if (! link_info.shared) { if (command_line.filter_shlib) einfo (_("%P%F: -F may not be used without -shared\n")); if (command_line.auxiliary_filters) einfo (_("%P%F: -f may not be used without -shared\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_sec_merge) 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 we have not already opened and parsed a linker script read the emulation's appropriate default script. */ if (saved_script_handle == NULL) { int isfile; char *s = ldemul_get_script (& isfile); if (isfile) ldfile_open_command_file (s); else { lex_string = s; lex_redirect (s); } parser_input = input_script; yyparse (); lex_string = NULL; } if (trace_file_tries) { if (saved_script_handle) info_msg (_("using external linker script:")); else info_msg (_("using internal linker script:")); info_msg ("\n==================================================\n"); if (saved_script_handle) { static const int ld_bufsz = 8193; size_t n; char *buf = xmalloc (ld_bufsz); rewind (saved_script_handle); while ((n = fread (buf, 1, ld_bufsz - 1, saved_script_handle)) > 0) { buf [n] = 0; info_msg (buf); } rewind (saved_script_handle); free (buf); } else { int isfile; info_msg (ldemul_get_script (& isfile)); } info_msg ("\n==================================================\n"); } 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 (link_info.relocateable) output_bfd->flags &= ~EXEC_P; else output_bfd->flags |= EXEC_P; ldwrite (); if (config.map_file != NULL) lang_map (); if (command_line.cref) output_cref (config.map_file != NULL ? config.map_file : stdout); if (nocrossref_list != NULL) check_nocrossrefs (); /* 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) == EOF) { einfo (_("%P: Error closing file `%s'\n"), dst_name); } free (dst_name); free (buf); } } } END_PROGRESS (program_name); if (config.stats) { #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 = 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 || strcmp (argv[i], "-mips32") == 0 || strcmp (argv[i], "-mips64") == 0 || strcmp (argv[i], "-mips4") == 0 || strcmp (argv[i], "-mips5") == 0) { /* FIXME: The arguments -mips1, -mips2, -mips3, etc. 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)) /* We've been installed normally. */ return; /* Look for "ldscripts" in the dir where our binary is. */ end = strrchr (program_name, '/'); #ifdef HAVE_DOS_BASED_FILE_SYSTEM { /* We could have \foo\bar, or /foo\bar. */ char *bslash = strrchr (program_name, '\\'); if (end == NULL || (bslash != NULL && bslash > end)) end = bslash; } #endif 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)) /* Don't free dir. */ return; /* Look for "ldscripts" in /../lib. */ strcpy (dir + dirlen, "/../lib"); if (check_for_scripts_dir (dir)) return; /* Well, we tried. */ free (dir); } 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. */ static boolean add_archive_element (info, abfd, name) struct bfd_link_info *info ATTRIBUTE_UNUSED; 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, _("Archive member included because of file (symbol)\n\n")); 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. */ static boolean multiple_definition (info, name, obfd, osec, oval, nbfd, nsec, nval) struct bfd_link_info *info ATTRIBUTE_UNUSED; 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) && bfd_is_abs_section (osec->output_section)) || (nsec->output_section != NULL && ! bfd_is_abs_section (nsec) && 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); if (command_line.relax) { einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n")); command_line.relax = 0; } 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. */ static boolean multiple_common (info, name, obfd, otype, osize, nbfd, ntype, nsize) struct bfd_link_info *info ATTRIBUTE_UNUSED; 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. */ static boolean add_to_set (info, h, reloc, abfd, section, value) 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; { 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. */ static boolean warning_callback (info, warning, symbol, abfd, section, address) struct bfd_link_info *info ATTRIBUTE_UNUSED; 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); if (entry == NULL) free (asymbols); } 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. */ static boolean undefined_symbol (info, name, abfd, section, address, fatal) struct bfd_link_info *info ATTRIBUTE_UNUSED; const char *name; bfd *abfd; asection *section; bfd_vma address; boolean fatal ATTRIBUTE_UNUSED; { 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 = xstrdup (name); } if (section != NULL) { if (error_count < MAX_ERRORS_IN_A_ROW) { einfo (_("%C: undefined reference to `%T'\n"), abfd, section, address, name); if (fatal) einfo ("%X"); } 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 (_("%B: undefined reference to `%T'\n"), abfd, name); if (fatal) einfo ("%X"); } 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. */ static boolean reloc_overflow (info, name, reloc_name, addend, abfd, section, address) struct bfd_link_info *info ATTRIBUTE_UNUSED; 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. */ static boolean reloc_dangerous (info, message, abfd, section, address) struct bfd_link_info *info ATTRIBUTE_UNUSED; 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. */ static boolean unattached_reloc (info, name, abfd, section, address) struct bfd_link_info *info ATTRIBUTE_UNUSED; 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)) { if (bfd_is_und_section (section)) einfo ("%B: reference to %s\n", abfd, name); else einfo ("%B: definition of %s\n", abfd, name); } if (command_line.cref || nocrossref_list != NULL) add_cref (name, abfd, section, value); return true; }