# This shell script emits a C file. -*- C -*- # It does some substitutions. cat >e${EMULATION_NAME}.c < Generate a base file for relocatable DLLs\n")); fprintf (file, _(" --dll Set image base to the default for DLLs\n")); fprintf (file, _(" --file-alignment Set file alignment\n")); fprintf (file, _(" --heap Set initial size of the heap\n")); fprintf (file, _(" --image-base
Set start address of the executable\n")); fprintf (file, _(" --major-image-version Set version number of the executable\n")); fprintf (file, _(" --major-os-version Set minimum required OS version\n")); fprintf (file, _(" --major-subsystem-version Set minimum required OS subsystem version\n")); fprintf (file, _(" --minor-image-version Set revision number of the executable\n")); fprintf (file, _(" --minor-os-version Set minimum required OS revision\n")); fprintf (file, _(" --minor-subsystem-version Set minimum required OS subsystem revision\n")); fprintf (file, _(" --section-alignment Set section alignment\n")); fprintf (file, _(" --stack Set size of the initial stack\n")); fprintf (file, _(" --subsystem [:] Set required OS subsystem [& version]\n")); fprintf (file, _(" --support-old-code Support interworking with old code\n")); #ifdef TARGET_IS_i386pe fprintf (file, _(" --add-stdcall-alias Export symbols with and without @nn\n")); fprintf (file, _(" --disable-stdcall-fixup Don't link _sym to _sym@nn\n")); fprintf (file, _(" --enable-stdcall-fixup Link _sym to _sym@nn without warnings\n")); fprintf (file, _(" --exclude-symbols sym,sym,... Exclude symbols from automatic export\n")); fprintf (file, _(" --export-all-symbols Automatically export all globals to DLL\n")); fprintf (file, _(" --kill-at Remove @nn from exported symbols\n")); fprintf (file, _(" --out-implib Generate import library\n")); fprintf (file, _(" --output-def Generate a .DEF file for the built DLL\n")); #endif } static void set_pe_name (name, val) char *name; long val; { int i; /* Find the name and set it. */ for (i = 0; init[i].ptr; i++) { if (strcmp (name, init[i].symbol) == 0) { init[i].value = val; init[i].inited = 1; return; } } abort(); } static void set_pe_subsystem () { const char *sver; int len; int i; static const struct { const char *name; const int value; const char *entry; } v[] = { { "native", 1, "_NtProcessStartup" }, { "windows", 2, "_WinMainCRTStartup" }, { "console", 3, "_mainCRTStartup" }, #if 0 /* The Microsoft linker does not recognize this. */ { "os2", 5, "" }, #endif { "posix", 7, "___PosixProcessStartup"}, { 0, 0, 0 } }; sver = strchr (optarg, ':'); if (sver == NULL) len = strlen (optarg); else { char *end; len = sver - optarg; set_pe_name ("__major_subsystem_version__", strtoul (sver + 1, &end, 0)); if (*end == '.') set_pe_name ("__minor_subsystem_version__", strtoul (end + 1, &end, 0)); if (*end != '\0') einfo (_("%P: warning: bad version number in -subsystem option\n")); } for (i = 0; v[i].name; i++) { if (strncmp (optarg, v[i].name, len) == 0 && v[i].name[len] == '\0') { set_pe_name ("__subsystem__", v[i].value); lang_add_entry (v[i].entry, 1); return; } } einfo (_("%P%F: invalid subsystem type %s\n"), optarg); } static void set_pe_value (name) char *name; { char *end; set_pe_name (name, strtoul (optarg, &end, 0)); if (end == optarg) einfo (_("%P%F: invalid hex number for PE parameter '%s'\n"), optarg); optarg = end; } static void set_pe_stack_heap (resname, comname) char *resname; char *comname; { set_pe_value (resname); if (*optarg == ',') { optarg++; set_pe_value (comname); } else if (*optarg) einfo (_("%P%F: strange hex info for PE parameter '%s'\n"), optarg); } static int gld_${EMULATION_NAME}_parse_args(argc, argv) int argc; char **argv; { int longind; int optc; int prevoptind = optind; int prevopterr = opterr; int wanterror; static int lastoptind = -1; if (lastoptind != optind) opterr = 0; wanterror = opterr; lastoptind = optind; optc = getopt_long_only (argc, argv, "-", longopts, &longind); opterr = prevopterr; switch (optc) { default: if (wanterror) xexit (1); optind = prevoptind; return 0; case OPTION_BASE_FILE: link_info.base_file = (PTR) fopen (optarg, FOPEN_WB); if (link_info.base_file == NULL) { /* xgettext:c-format */ fprintf (stderr, _("%s: Can't open base file %s\n"), program_name, optarg); xexit (1); } break; /* PE options */ case OPTION_HEAP: set_pe_stack_heap ("__size_of_heap_reserve__", "__size_of_heap_commit__"); break; case OPTION_STACK: set_pe_stack_heap ("__size_of_stack_reserve__", "__size_of_stack_commit__"); break; case OPTION_SUBSYSTEM: set_pe_subsystem (); break; case OPTION_MAJOR_OS_VERSION: set_pe_value ("__major_os_version__"); break; case OPTION_MINOR_OS_VERSION: set_pe_value ("__minor_os_version__"); break; case OPTION_MAJOR_SUBSYSTEM_VERSION: set_pe_value ("__major_subsystem_version__"); break; case OPTION_MINOR_SUBSYSTEM_VERSION: set_pe_value ("__minor_subsystem_version__"); break; case OPTION_MAJOR_IMAGE_VERSION: set_pe_value ("__major_image_version__"); break; case OPTION_MINOR_IMAGE_VERSION: set_pe_value ("__minor_image_version__"); break; case OPTION_FILE_ALIGNMENT: set_pe_value ("__file_alignment__"); break; case OPTION_SECTION_ALIGNMENT: set_pe_value ("__section_alignment__"); break; case OPTION_DLL: set_pe_name ("__dll__", 1); break; case OPTION_IMAGE_BASE: set_pe_value ("__image_base__"); break; case OPTION_SUPPORT_OLD_CODE: support_old_code = 1; break; case OPTION_OUT_DEF: pe_out_def_filename = xstrdup (optarg); break; case OPTION_EXPORT_ALL: pe_dll_export_everything = 1; break; case OPTION_EXCLUDE_SYMBOLS: #ifdef TARGET_IS_i386pe pe_dll_add_excludes (optarg); #endif break; case OPTION_KILL_ATS: pe_dll_kill_ats = 1; break; case OPTION_STDCALL_ALIASES: pe_dll_stdcall_aliases = 1; break; case OPTION_ENABLE_STDCALL_FIXUP: pe_enable_stdcall_fixup = 1; break; case OPTION_DISABLE_STDCALL_FIXUP: pe_enable_stdcall_fixup = 0; break; case OPTION_IMPLIB_FILENAME: pe_implib_filename = xstrdup (optarg); break; } return 1; } /* Assign values to the special symbols before the linker script is read. */ static void gld_${EMULATION_NAME}_set_symbols () { /* Run through and invent symbols for all the names and insert the defaults. */ int j; lang_statement_list_type *save; if (!init[IMAGEBASEOFF].inited) { if (link_info.relocateable) init[IMAGEBASEOFF].value = 0; else if (init[DLLOFF].value || link_info.shared) init[IMAGEBASEOFF].value = NT_DLL_IMAGE_BASE; else init[IMAGEBASEOFF].value = NT_EXE_IMAGE_BASE; } /* Don't do any symbol assignments if this is a relocateable link. */ if (link_info.relocateable) return; /* Glue the assignments into the abs section */ save = stat_ptr; stat_ptr = &(abs_output_section->children); for (j = 0; init[j].ptr; j++) { long val = init[j].value; lang_assignment_statement_type *rv; rv = lang_add_assignment (exp_assop ('=' ,init[j].symbol, exp_intop (val))); if (init[j].size == sizeof(short)) *(short *)init[j].ptr = val; else if (init[j].size == sizeof(int)) *(int *)init[j].ptr = val; else if (init[j].size == sizeof(long)) *(long *)init[j].ptr = val; /* This might be a long long or other special type. */ else if (init[j].size == sizeof(bfd_vma)) *(bfd_vma *)init[j].ptr = val; else abort(); if (j == IMAGEBASEOFF) image_base_statement = rv; } /* Restore the pointer. */ stat_ptr = save; if (pe.FileAlignment > pe.SectionAlignment) { einfo (_("%P: warning, file alignment > section alignment.\n")); } } /* This is called after the linker script and the command line options have been read. */ static void gld_${EMULATION_NAME}_after_parse () { /* The Windows libraries are designed for the linker to treat the entry point as an undefined symbol. Otherwise, the .obj that defines mainCRTStartup is brought in because it is the first encountered in libc.lib and it has other symbols in it which will be pulled in by the link process. To avoid this, we act as though the user specified -u with the entry point symbol. This function is called after the linker script and command line options have been read, so at this point we know the right entry point. This function is called before the input files are opened, so registering the symbol as undefined will make a difference. */ if (entry_symbol) ldlang_add_undef (entry_symbol); } static struct bfd_link_hash_entry *pe_undef_found_sym; static boolean pe_undef_cdecl_match (h, string) struct bfd_link_hash_entry *h; PTR string; { int sl = strlen (string); if (h->type == bfd_link_hash_defined && strncmp (h->root.string, string, sl) == 0 && h->root.string[sl] == '@') { pe_undef_found_sym = h; return false; } return true; } static void pe_fixup_stdcalls () { static int gave_warning_message = 0; struct bfd_link_hash_entry *undef, *sym; char *at; for (undef = link_info.hash->undefs; undef; undef=undef->next) if (undef->type == bfd_link_hash_undefined) { at = strchr (undef->root.string, '@'); if (at) { /* The symbol is a stdcall symbol, so let's look for a cdecl symbol with the same name and resolve to that */ char *cname = xstrdup (undef->root.string); at = strchr (cname, '@'); *at = 0; sym = bfd_link_hash_lookup (link_info.hash, cname, 0, 0, 1); if (sym && sym->type == bfd_link_hash_defined) { undef->type = bfd_link_hash_defined; undef->u.def.value = sym->u.def.value; undef->u.def.section = sym->u.def.section; if (pe_enable_stdcall_fixup == -1) { einfo (_("Warning: resolving %s by linking to %s\n"), undef->root.string, cname); if (! gave_warning_message) { gave_warning_message = 1; einfo(_("Use --enable-stdcall-fixup to disable these warnings\n")); einfo(_("Use --disable-stdcall-fixup to disable these fixups\n")); } } } } else { /* The symbol is a cdecl symbol, so we look for stdcall symbols - which means scanning the whole symbol table */ pe_undef_found_sym = 0; bfd_link_hash_traverse (link_info.hash, pe_undef_cdecl_match, (PTR) undef->root.string); sym = pe_undef_found_sym; if (sym) { undef->type = bfd_link_hash_defined; undef->u.def.value = sym->u.def.value; undef->u.def.section = sym->u.def.section; if (pe_enable_stdcall_fixup == -1) { einfo (_("Warning: resolving %s by linking to %s\n"), undef->root.string, sym->root.string); if (! gave_warning_message) { gave_warning_message = 1; einfo(_("Use --enable-stdcall-fixup to disable these warnings\n")); einfo(_("Use --disable-stdcall-fixup to disable these fixups\n")); } } } } } } static void gld_${EMULATION_NAME}_after_open () { /* Pass the wacky PE command line options into the output bfd. FIXME: This should be done via a function, rather than by including an internal BFD header. */ if (!coff_data (output_bfd)->pe) einfo (_("%F%P: PE operations on non PE file.\n")); pe_data (output_bfd)->pe_opthdr = pe; pe_data (output_bfd)->dll = init[DLLOFF].value; #ifdef TARGET_IS_i386pe if (pe_enable_stdcall_fixup) /* -1=warn or 1=disable */ pe_fixup_stdcalls (); pe_process_import_defs(output_bfd, &link_info); if (link_info.shared) pe_dll_build_sections (output_bfd, &link_info); #endif #if defined(TARGET_IS_armpe) || defined(TARGET_IS_arm_epoc_pe) { /* Find a BFD that can hold the interworking stubs. */ LANG_FOR_EACH_INPUT_STATEMENT (is) { if (bfd_arm_get_bfd_for_interworking (is->the_bfd, & link_info)) break; } } #endif } static void gld_${EMULATION_NAME}_before_allocation() { #ifdef TARGET_IS_ppcpe /* Here we rummage through the found bfds to collect toc information */ { LANG_FOR_EACH_INPUT_STATEMENT (is) { if (!ppc_process_before_allocation (is->the_bfd, &link_info)) { /* xgettext:c-format */ einfo (_("Errors encountered processing file %s\n"), is->filename); } } } /* We have seen it all. Allocate it, and carry on */ ppc_allocate_toc_section (&link_info); #endif /* TARGET_IS_ppcpe */ #if defined(TARGET_IS_armpe) || defined(TARGET_IS_arm_epoc_pe) /* FIXME: we should be able to set the size of the interworking stub section. Here we rummage through the found bfds to collect glue information. FIXME: should this be based on a command line option? krk@cygnus.com */ { LANG_FOR_EACH_INPUT_STATEMENT (is) { if (! bfd_arm_process_before_allocation (is->the_bfd, & link_info, support_old_code)) { /* xgettext:c-format */ einfo (_("Errors encountered processing file %s for interworking"), is->filename); } } } /* We have seen it all. Allocate it, and carry on */ bfd_arm_allocate_interworking_sections (& link_info); #endif /* TARGET_IS_armpe */ } /* This is called when an input file isn't recognized as a BFD. We check here for .DEF files and pull them in automatically. */ static int saw_option(char *option) { int i; for (i=0; init[i].ptr; i++) if (strcmp (init[i].symbol, option) == 0) return init[i].inited; return 0; } static boolean gld_${EMULATION_NAME}_unrecognized_file(entry) lang_input_statement_type *entry; { #ifdef TARGET_IS_i386pe const char *ext = entry->filename + strlen (entry->filename) - 4; if (strcmp (ext, ".def") == 0 || strcmp (ext, ".DEF") == 0) { if (pe_def_file == 0) pe_def_file = def_file_empty (); def_file_parse (entry->filename, pe_def_file); if (pe_def_file) { int i, buflen=0, len; char *buf; for (i=0; inum_exports; i++) { len = strlen(pe_def_file->exports[i].internal_name); if (buflen < len+2) buflen = len+2; } buf = (char *) xmalloc (buflen); for (i=0; inum_exports; i++) { struct bfd_link_hash_entry *h; sprintf(buf, "_%s", pe_def_file->exports[i].internal_name); h = bfd_link_hash_lookup (link_info.hash, buf, 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 = NULL; bfd_link_add_undef (link_info.hash, h); } } free (buf); /* def_file_print (stdout, pe_def_file); */ if (pe_def_file->is_dll == 1) link_info.shared = 1; if (pe_def_file->base_address != (bfd_vma)(-1)) { pe.ImageBase = pe_data (output_bfd)->pe_opthdr.ImageBase = init[IMAGEBASEOFF].value = pe_def_file->base_address; init[IMAGEBASEOFF].inited = 1; if (image_base_statement) image_base_statement->exp = exp_assop ('=', "__image_base__", exp_intop (pe.ImageBase)); } #if 0 /* Not sure if these *should* be set */ if (pe_def_file->version_major != -1) { pe.MajorImageVersion = pe_def_file->version_major; pe.MinorImageVersion = pe_def_file->version_minor; } #endif if (pe_def_file->stack_reserve != -1 && ! saw_option ("__size_of_stack_reserve__")) { pe.SizeOfStackReserve = pe_def_file->stack_reserve; if (pe_def_file->stack_commit != -1) pe.SizeOfStackCommit = pe_def_file->stack_commit; } if (pe_def_file->heap_reserve != -1 && ! saw_option ("__size_of_heap_reserve__")) { pe.SizeOfHeapReserve = pe_def_file->heap_reserve; if (pe_def_file->heap_commit != -1) pe.SizeOfHeapCommit = pe_def_file->heap_commit; } return true; } } #endif return false; } static boolean gld_${EMULATION_NAME}_recognized_file(entry) lang_input_statement_type *entry; { #ifdef TARGET_IS_i386pe if (bfd_get_format (entry->the_bfd) == bfd_object) { const char *ext = entry->filename + strlen (entry->filename) - 4; if (strcmp (ext, ".dll") == 0 || strcmp (ext, ".DLL") == 0) return pe_implied_import_dll (entry->filename); } #endif return false; } static void gld_${EMULATION_NAME}_finish () { #ifdef TARGET_IS_i386pe if (link_info.shared) { pe_dll_fill_sections (output_bfd, &link_info); if (pe_implib_filename) pe_dll_generate_implib (pe_def_file, pe_implib_filename); } if (pe_out_def_filename) pe_dll_generate_def_file (pe_out_def_filename); #endif } /* Place an orphan section. We use this to put sections in a reasonable place in the file, and to ensure that they are aligned as required. We handle grouped sections here as well. A section named .foo$nn goes into the output section .foo. All grouped sections are sorted by name. Grouped sections for the default sections are handled by the default linker script using wildcards, and are sorted by sort_sections. */ static asection *hold_section; static char *hold_section_name; static lang_output_section_statement_type *hold_use; static lang_output_section_statement_type *hold_text; static lang_output_section_statement_type *hold_rdata; static lang_output_section_statement_type *hold_data; static lang_output_section_statement_type *hold_bss; /* Place an orphan section. We use this to put random SHF_ALLOC sections in the right segment. */ /*ARGSUSED*/ static boolean gld_${EMULATION_NAME}_place_orphan (file, s) lang_input_statement_type *file; asection *s; { const char *secname; char *dollar; if ((s->flags & SEC_ALLOC) == 0) return false; secname = bfd_get_section_name (s->owner, s); /* Look through the script to see where to place this section. */ hold_section = s; hold_section_name = xstrdup (secname); dollar = strchr (hold_section_name, '$'); if (dollar != NULL) *dollar = '\0'; hold_use = NULL; lang_for_each_statement (gld${EMULATION_NAME}_place_section); if (hold_use == NULL) { lang_output_section_statement_type *place; char *outsecname; asection *snew, **pps; lang_statement_list_type *old; lang_statement_list_type add; etree_type *address; /* Try to put the new output section in a reasonable place based on the section name and section flags. */ place = NULL; if ((s->flags & SEC_HAS_CONTENTS) == 0 && hold_bss != NULL) place = hold_bss; else if ((s->flags & SEC_READONLY) == 0 && hold_data != NULL) place = hold_data; else if ((s->flags & SEC_CODE) == 0 && (s->flags & SEC_READONLY) != 0 && hold_rdata != NULL) place = hold_rdata; else if ((s->flags & SEC_READONLY) != 0 && hold_text != NULL) place = hold_text; /* Choose a unique name for the section. This will be needed if the same section name appears in the input file with different loadable or allocateable characteristics. */ outsecname = xstrdup (hold_section_name); if (bfd_get_section_by_name (output_bfd, outsecname) != NULL) { unsigned int len; char *newname; unsigned int i; len = strlen (outsecname); newname = xmalloc (len + 5); strcpy (newname, outsecname); i = 0; do { sprintf (newname + len, "%d", i); ++i; } while (bfd_get_section_by_name (output_bfd, newname) != NULL); free (outsecname); outsecname = newname; } /* We don't want to free OUTSECNAME, as it may get attached to the output section statement. */ /* Create the section in the output file, and put it in the right place. This shuffling is to make the output file look neater. */ snew = bfd_make_section (output_bfd, outsecname); if (snew == NULL) einfo ("%P%F: output format %s cannot represent section called %s\n", output_bfd->xvec->name, outsecname); if (place != NULL && place->bfd_section != NULL) { for (pps = &output_bfd->sections; *pps != snew; pps = &(*pps)->next) ; *pps = snew->next; snew->next = place->bfd_section->next; place->bfd_section->next = snew; } /* Start building a list of statements for this section. */ old = stat_ptr; stat_ptr = &add; lang_list_init (stat_ptr); if (link_info.relocateable) address = NULL; else { /* All sections in an executable must be aligned to a page boundary. */ address = exp_unop (ALIGN_K, exp_nameop (NAME, "__section_alignment__")); } lang_enter_output_section_statement (outsecname, address, 0, (bfd_vma) 0, (etree_type *) NULL, (etree_type *) NULL, (etree_type *) NULL); hold_use = lang_output_section_statement_lookup (outsecname); lang_leave_output_section_statement ((bfd_vma) 0, "*default*", (struct lang_output_section_phdr_list *) NULL); /* Now stick the new statement list right after PLACE. */ if (place != NULL) { *add.tail = place->header.next; place->header.next = add.head; } stat_ptr = old; } if (dollar == NULL) wild_doit (&hold_use->children, s, hold_use, file); else { lang_statement_union_type **pl; boolean found_dollar; lang_statement_list_type list; /* The section name has a '$'. Sort it with the other '$' sections. */ found_dollar = false; for (pl = &hold_use->children.head; *pl != NULL; pl = &(*pl)->next) { lang_input_section_type *ls; const char *lname; if ((*pl)->header.type != lang_input_section_enum) continue; ls = &(*pl)->input_section; lname = bfd_get_section_name (ls->ifile->the_bfd, ls->section); if (strchr (lname, '$') == NULL) { if (found_dollar) break; } else { found_dollar = true; if (strcmp (secname, lname) < 0) break; } } lang_list_init (&list); wild_doit (&list, s, hold_use, file); if (list.head != NULL) { ASSERT (list.head->next == NULL); list.head->next = *pl; *pl = list.head; } } free (hold_section_name); return true; } static void gld${EMULATION_NAME}_place_section (s) lang_statement_union_type *s; { lang_output_section_statement_type *os; if (s->header.type != lang_output_section_statement_enum) return; os = &s->output_section_statement; if (strcmp (os->name, hold_section_name) == 0 && os->bfd_section != NULL && ((hold_section->flags & (SEC_LOAD | SEC_ALLOC)) == (os->bfd_section->flags & (SEC_LOAD | SEC_ALLOC)))) hold_use = os; if (strcmp (os->name, ".text") == 0) hold_text = os; else if (strcmp (os->name, ".rdata") == 0) hold_rdata = os; else if (strcmp (os->name, ".data") == 0) hold_data = os; else if (strcmp (os->name, ".bss") == 0) hold_bss = os; } static char * gld_${EMULATION_NAME}_get_script(isfile) int *isfile; EOF # Scripts compiled in. # sed commands to quote an ld script as a C string. sc="-f ${srcdir}/emultempl/stringify.sed" cat >>e${EMULATION_NAME}.c <> e${EMULATION_NAME}.c echo ' ; else if (link_info.relocateable == true) return' >> e${EMULATION_NAME}.c sed $sc ldscripts/${EMULATION_NAME}.xr >> e${EMULATION_NAME}.c echo ' ; else if (!config.text_read_only) return' >> e${EMULATION_NAME}.c sed $sc ldscripts/${EMULATION_NAME}.xbn >> e${EMULATION_NAME}.c echo ' ; else if (!config.magic_demand_paged) return' >> e${EMULATION_NAME}.c sed $sc ldscripts/${EMULATION_NAME}.xn >> e${EMULATION_NAME}.c echo ' ; else return' >> e${EMULATION_NAME}.c sed $sc ldscripts/${EMULATION_NAME}.x >> e${EMULATION_NAME}.c echo '; }' >> e${EMULATION_NAME}.c cat >>e${EMULATION_NAME}.c <