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Diffstat (limited to 'contrib/binutils/ld/ldmain.c')
| -rw-r--r-- | contrib/binutils/ld/ldmain.c | 1271 |
1 files changed, 1271 insertions, 0 deletions
diff --git a/contrib/binutils/ld/ldmain.c b/contrib/binutils/ld/ldmain.c new file mode 100644 index 000000000000..94b9b5751fe2 --- /dev/null +++ b/contrib/binutils/ld/ldmain.c @@ -0,0 +1,1271 @@ +/* Main program of GNU linker. + Copyright (C) 1991, 92, 93, 94, 95, 96, 1997 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> + +#ifdef HAVE_SBRK +#ifdef NEED_DECLARATION_SBRK +extern PTR sbrk (); +#endif +#endif + +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 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)); +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); + + /* 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); + } + + /* 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.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 (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) + { + 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 = 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], "-mips4") == 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) + && 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); + 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); + + 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. */ + +/*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 (command_line.cref || nocrossref_list != NULL) + add_cref (name, abfd, section, value); + + return true; +} |