/* Routines to help build PEI-format DLLs (Win32 etc) Copyright (C) 1998, 1999 Free Software Foundation, Inc. Written by DJ Delorie 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 "bfdlink.h" #include "libiberty.h" #include #include #include "ld.h" #include "ldexp.h" #include "ldlang.h" #include "ldwrite.h" #include "ldmisc.h" #include "ldgram.h" #include "ldmain.h" #include "ldemul.h" #include "coff/internal.h" #include "../bfd/libcoff.h" #include "deffile.h" #include "pe-dll.h" /************************************************************************ This file turns a regular Windows PE image into a DLL. Because of the complexity of this operation, it has been broken down into a number of separate modules which are all called by the main function at the end of this file. This function is not re-entrant and is normally only called once, so static variables are used to reduce the number of parameters and return values required. See also: ld/emultempl/pe.em ************************************************************************/ /* for emultempl/pe.em */ def_file *pe_def_file = 0; int pe_dll_export_everything = 0; int pe_dll_do_default_excludes = 1; int pe_dll_kill_ats = 0; int pe_dll_stdcall_aliases = 0; /************************************************************************ static variables and types ************************************************************************/ static bfd_vma image_base; static bfd *filler_bfd; static struct sec *edata_s, *reloc_s; static unsigned char *edata_d, *reloc_d; static size_t edata_sz, reloc_sz; typedef struct { char *target_name; char *object_target; unsigned int imagebase_reloc; int pe_arch; int bfd_arch; int underscored; } pe_details_type; #define PE_ARCH_i386 1 static pe_details_type pe_detail_list[] = { { "pei-i386", "pe-i386", 7 /* R_IMAGEBASE */, PE_ARCH_i386, bfd_arch_i386, 1 }, { NULL, NULL, 0, 0, 0, 0 } }; static pe_details_type *pe_details; #define U(str) (pe_details->underscored ? "_" str : str) void pe_dll_id_target (target) const char *target; { int i; for (i=0; pe_detail_list[i].target_name; i++) if (strcmp (pe_detail_list[i].target_name, target) == 0) { pe_details = pe_detail_list+i; return; } einfo (_("%XUnsupported PEI architecture: %s\n"), target); exit (1); } /************************************************************************ Helper functions for qsort. Relocs must be sorted so that we can write them out by pages. ************************************************************************/ typedef struct { bfd_vma vma; char type; short extra; } reloc_data_type; static int reloc_sort (va, vb) const void *va, *vb; { bfd_vma a = ((reloc_data_type *) va)->vma; bfd_vma b = ((reloc_data_type *) vb)->vma; return (a > b) ? 1 : ((a < b) ? -1 : 0); } static int pe_export_sort (va, vb) const void *va, *vb; { def_file_export *a = (def_file_export *) va; def_file_export *b = (def_file_export *) vb; return strcmp (a->name, b->name); } /************************************************************************ Read and process the .DEF file ************************************************************************/ /* These correspond to the entries in pe_def_file->exports[]. I use exported_symbol_sections[i] to tag whether or not the symbol was defined, since we can't export symbols we don't have. */ static bfd_vma *exported_symbol_offsets; static struct sec **exported_symbol_sections; static int export_table_size; static int count_exported; static int count_exported_byname; static int count_with_ordinals; static const char *dll_name; static int min_ordinal, max_ordinal; static int *exported_symbols; typedef struct exclude_list_struct { char *string; struct exclude_list_struct *next; } exclude_list_struct; static struct exclude_list_struct *excludes = 0; void pe_dll_add_excludes (new_excludes) const char *new_excludes; { char *local_copy; char *exclude_string; local_copy = xstrdup (new_excludes); exclude_string = strtok (local_copy, ",:"); for (; exclude_string; exclude_string = strtok (NULL, ",:")) { struct exclude_list_struct *new_exclude; new_exclude = ((struct exclude_list_struct *) xmalloc (sizeof (struct exclude_list_struct))); new_exclude->string = (char *) xmalloc (strlen (exclude_string) + 1); strcpy (new_exclude->string, exclude_string); new_exclude->next = excludes; excludes = new_exclude; } free (local_copy); } static int auto_export (d, n) def_file *d; const char *n; { int i; struct exclude_list_struct *ex; for (i = 0; i < d->num_exports; i++) if (strcmp (d->exports[i].name, n) == 0) return 0; if (pe_dll_do_default_excludes) { if (strcmp (n, "DllMain@12") == 0) return 0; if (strcmp (n, "DllEntryPoint@0") == 0) return 0; if (strcmp (n, "impure_ptr") == 0) return 0; } for (ex = excludes; ex; ex = ex->next) if (strcmp (n, ex->string) == 0) return 0; return 1; } static void process_def_file (abfd, info) bfd *abfd ATTRIBUTE_UNUSED; struct bfd_link_info *info; { int i, j; struct bfd_link_hash_entry *blhe; bfd *b; struct sec *s; def_file_export *e=0; if (!pe_def_file) pe_def_file = def_file_empty (); /* First, run around to all the objects looking for the .drectve sections, and push those into the def file too */ for (b = info->input_bfds; b; b = b->link_next) { s = bfd_get_section_by_name (b, ".drectve"); if (s) { int size = bfd_get_section_size_before_reloc (s); char *buf = xmalloc (size); bfd_get_section_contents (b, s, buf, 0, size); def_file_add_directive (pe_def_file, buf, size); free (buf); } } /* Now, maybe export everything else the default way */ if (pe_dll_export_everything || pe_def_file->num_exports == 0) { for (b = info->input_bfds; b; b = b->link_next) { asymbol **symbols; int nsyms, symsize; symsize = bfd_get_symtab_upper_bound (b); symbols = (asymbol **) xmalloc (symsize); nsyms = bfd_canonicalize_symtab (b, symbols); for (j = 0; j < nsyms; j++) { if ((symbols[j]->flags & (BSF_FUNCTION | BSF_GLOBAL)) == (BSF_FUNCTION | BSF_GLOBAL)) { const char *sn = symbols[j]->name; if (*sn == '_') sn++; if (auto_export (pe_def_file, sn)) def_file_add_export (pe_def_file, sn, 0, -1); } } } } #undef NE #define NE pe_def_file->num_exports /* Canonicalize the export list */ if (pe_dll_kill_ats) { for (i = 0; i < NE; i++) { if (strchr (pe_def_file->exports[i].name, '@')) { /* This will preserve internal_name, which may have been pointing to the same memory as name, or might not have */ char *tmp = xstrdup (pe_def_file->exports[i].name); *(strchr (tmp, '@')) = 0; pe_def_file->exports[i].name = tmp; } } } if (pe_dll_stdcall_aliases) { for (i = 0; i < NE; i++) { if (strchr (pe_def_file->exports[i].name, '@')) { char *tmp = xstrdup (pe_def_file->exports[i].name); *(strchr (tmp, '@')) = 0; if (auto_export (pe_def_file, tmp)) def_file_add_export (pe_def_file, tmp, pe_def_file->exports[i].internal_name, -1); else free (tmp); } } } e = pe_def_file->exports; /* convenience, but watch out for it changing */ exported_symbol_offsets = (bfd_vma *) xmalloc (NE * sizeof (bfd_vma)); exported_symbol_sections = (struct sec **) xmalloc (NE * sizeof (struct sec *)); memset (exported_symbol_sections, 0, NE * sizeof (struct sec *)); max_ordinal = 0; min_ordinal = 65536; count_exported = 0; count_exported_byname = 0; count_with_ordinals = 0; qsort (pe_def_file->exports, NE, sizeof (pe_def_file->exports[0]), pe_export_sort); for (i = 0, j = 0; i < NE; i++) { if (i > 0 && strcmp (e[i].name, e[i - 1].name) == 0) { /* This is a duplicate */ if (e[j - 1].ordinal != -1 && e[i].ordinal != -1 && e[j - 1].ordinal != e[i].ordinal) { /* xgettext:c-format */ einfo (_("%XError, duplicate EXPORT with oridinals: %s (%d vs %d)\n"), e[j - 1].name, e[j - 1].ordinal, e[i].ordinal); } else { /* xgettext:c-format */ einfo (_("Warning, duplicate EXPORT: %s\n"), e[j - 1].name); } if (e[i].ordinal) e[j - 1].ordinal = e[i].ordinal; e[j - 1].flag_private |= e[i].flag_private; e[j - 1].flag_constant |= e[i].flag_constant; e[j - 1].flag_noname |= e[i].flag_noname; e[j - 1].flag_data |= e[i].flag_data; } else { if (i != j) e[j] = e[i]; j++; } } pe_def_file->num_exports = j; /* == NE */ for (i = 0; i < NE; i++) { char *name = (char *) xmalloc (strlen (pe_def_file->exports[i].internal_name) + 2); if (pe_details->underscored) { *name = '_'; strcpy (name + 1, pe_def_file->exports[i].internal_name); } else strcpy (name, pe_def_file->exports[i].internal_name); blhe = bfd_link_hash_lookup (info->hash, name, false, false, true); if (blhe && (blhe->type == bfd_link_hash_defined)) { count_exported++; if (!pe_def_file->exports[i].flag_noname) count_exported_byname++; exported_symbol_offsets[i] = blhe->u.def.value; exported_symbol_sections[i] = blhe->u.def.section; if (pe_def_file->exports[i].ordinal != -1) { if (max_ordinal < pe_def_file->exports[i].ordinal) max_ordinal = pe_def_file->exports[i].ordinal; if (min_ordinal > pe_def_file->exports[i].ordinal) min_ordinal = pe_def_file->exports[i].ordinal; count_with_ordinals++; } } else if (blhe && blhe->type == bfd_link_hash_undefined) { /* xgettext:c-format */ einfo (_("%XCannot export %s: symbol not defined\n"), pe_def_file->exports[i].internal_name); } else if (blhe) { /* xgettext:c-format */ einfo (_("%XCannot export %s: symbol wrong type (%d vs %d)\n"), pe_def_file->exports[i].internal_name, blhe->type, bfd_link_hash_defined); } else { /* xgettext:c-format */ einfo (_("%XCannot export %s: symbol not found\n"), pe_def_file->exports[i].internal_name); } free (name); } } /************************************************************************ Build the bfd that will contain .edata and .reloc sections ************************************************************************/ static void build_filler_bfd (include_edata) int include_edata; { lang_input_statement_type *filler_file; filler_file = lang_add_input_file ("dll stuff", lang_input_file_is_fake_enum, NULL); filler_file->the_bfd = filler_bfd = bfd_create ("dll stuff", output_bfd); if (filler_bfd == NULL || !bfd_set_arch_mach (filler_bfd, bfd_get_arch (output_bfd), bfd_get_mach (output_bfd))) { einfo ("%X%P: can not create BFD %E\n"); return; } if (include_edata) { edata_s = bfd_make_section_old_way (filler_bfd, ".edata"); if (edata_s == NULL || !bfd_set_section_flags (filler_bfd, edata_s, (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_KEEP | SEC_IN_MEMORY))) { einfo ("%X%P: can not create .edata section: %E\n"); return; } bfd_set_section_size (filler_bfd, edata_s, edata_sz); } reloc_s = bfd_make_section_old_way (filler_bfd, ".reloc"); if (reloc_s == NULL || !bfd_set_section_flags (filler_bfd, reloc_s, (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_KEEP | SEC_IN_MEMORY))) { einfo ("%X%P: can not create .reloc section: %E\n"); return; } bfd_set_section_size (filler_bfd, reloc_s, 0); ldlang_add_file (filler_file); } /************************************************************************ Gather all the exported symbols and build the .edata section ************************************************************************/ static void generate_edata (abfd, info) bfd *abfd; struct bfd_link_info *info ATTRIBUTE_UNUSED; { int i, next_ordinal; int name_table_size = 0; const char *dlnp; /* First, we need to know how many exported symbols there are, and what the range of ordinals is. */ if (pe_def_file->name) { dll_name = pe_def_file->name; } else { dll_name = abfd->filename; for (dlnp = dll_name; *dlnp; dlnp++) { if (*dlnp == '\\' || *dlnp == '/' || *dlnp == ':') dll_name = dlnp + 1; } } if (count_with_ordinals && max_ordinal > count_exported) { if (min_ordinal > max_ordinal - count_exported + 1) min_ordinal = max_ordinal - count_exported + 1; } else { min_ordinal = 1; max_ordinal = count_exported; } export_table_size = max_ordinal - min_ordinal + 1; exported_symbols = (int *) xmalloc (export_table_size * sizeof (int)); for (i = 0; i < export_table_size; i++) exported_symbols[i] = -1; /* Now we need to assign ordinals to those that don't have them */ for (i = 0; i < NE; i++) { if (exported_symbol_sections[i]) { if (pe_def_file->exports[i].ordinal != -1) { int ei = pe_def_file->exports[i].ordinal - min_ordinal; int pi = exported_symbols[ei]; if (pi != -1) { /* xgettext:c-format */ einfo (_("%XError, oridinal used twice: %d (%s vs %s)\n"), pe_def_file->exports[i].ordinal, pe_def_file->exports[i].name, pe_def_file->exports[pi].name); } exported_symbols[ei] = i; } name_table_size += strlen (pe_def_file->exports[i].name) + 1; } } next_ordinal = min_ordinal; for (i = 0; i < NE; i++) if (exported_symbol_sections[i]) if (pe_def_file->exports[i].ordinal == -1) { while (exported_symbols[next_ordinal - min_ordinal] != -1) next_ordinal++; exported_symbols[next_ordinal - min_ordinal] = i; pe_def_file->exports[i].ordinal = next_ordinal; } /* OK, now we can allocate some memory */ edata_sz = (40 /* directory */ + 4 * export_table_size /* addresses */ + 4 * count_exported_byname /* name ptrs */ + 2 * count_exported_byname /* ordinals */ + name_table_size + strlen (dll_name) + 1); } static void fill_edata (abfd, info) bfd *abfd; struct bfd_link_info *info ATTRIBUTE_UNUSED; { int i, hint; unsigned char *edirectory; unsigned long *eaddresses; unsigned long *enameptrs; unsigned short *eordinals; unsigned char *enamestr; time_t now; time (&now); edata_d = (unsigned char *) xmalloc (edata_sz); /* Note use of array pointer math here */ edirectory = edata_d; eaddresses = (unsigned long *) (edata_d + 40); enameptrs = eaddresses + export_table_size; eordinals = (unsigned short *) (enameptrs + count_exported_byname); enamestr = (char *) (eordinals + count_exported_byname); #define ERVA(ptr) (((unsigned char *)(ptr) - edata_d) + edata_s->output_section->vma - image_base) memset (edata_d, 0, 40); bfd_put_32 (abfd, now, edata_d + 4); if (pe_def_file->version_major != -1) { bfd_put_16 (abfd, pe_def_file->version_major, edata_d + 8); bfd_put_16 (abfd, pe_def_file->version_minor, edata_d + 10); } bfd_put_32 (abfd, ERVA (enamestr), edata_d + 12); strcpy (enamestr, dll_name); enamestr += strlen (enamestr) + 1; bfd_put_32 (abfd, min_ordinal, edata_d + 16); bfd_put_32 (abfd, export_table_size, edata_d + 20); bfd_put_32 (abfd, count_exported_byname, edata_d + 24); bfd_put_32 (abfd, ERVA (eaddresses), edata_d + 28); bfd_put_32 (abfd, ERVA (enameptrs), edata_d + 32); bfd_put_32 (abfd, ERVA (eordinals), edata_d + 36); /* Ok, now for the filling in part */ hint = 0; for (i = 0; i < export_table_size; i++) { int s = exported_symbols[i]; if (s != -1) { struct sec *ssec = exported_symbol_sections[s]; unsigned long srva = (exported_symbol_offsets[s] + ssec->output_section->vma + ssec->output_offset); bfd_put_32 (abfd, srva - image_base, (void *) (eaddresses + i)); if (!pe_def_file->exports[s].flag_noname) { char *ename = pe_def_file->exports[s].name; bfd_put_32 (abfd, ERVA (enamestr), (void *) enameptrs); strcpy (enamestr, ename); enamestr += strlen (enamestr) + 1; bfd_put_16 (abfd, i, (void *) eordinals); enameptrs++; pe_def_file->exports[s].hint = hint++; } eordinals++; } } } /************************************************************************ Gather all the relocations and build the .reloc section ************************************************************************/ static void generate_reloc (abfd, info) bfd *abfd; struct bfd_link_info *info; { /* for .reloc stuff */ reloc_data_type *reloc_data; int total_relocs = 0; int i; unsigned long sec_page = (unsigned long) (-1); unsigned long page_ptr, page_count; int bi; bfd *b; struct sec *s; total_relocs = 0; for (b = info->input_bfds; b; b = b->link_next) for (s = b->sections; s; s = s->next) total_relocs += s->reloc_count; reloc_data = (reloc_data_type *) xmalloc (total_relocs * sizeof (reloc_data_type)); total_relocs = 0; bi = 0; for (bi = 0, b = info->input_bfds; b; bi++, b = b->link_next) { arelent **relocs; int relsize, nrelocs, i; for (s = b->sections; s; s = s->next) { unsigned long sec_vma = s->output_section->vma + s->output_offset; asymbol **symbols; int nsyms, symsize; /* if it's not loaded, we don't need to relocate it this way */ if (!(s->output_section->flags & SEC_LOAD)) continue; /* I don't know why there would be a reloc for these, but I've seen it happen - DJ */ if (s->output_section == &bfd_abs_section) continue; if (s->output_section->vma == 0) { /* Huh? Shouldn't happen, but punt if it does */ einfo ("DJ: zero vma section reloc detected: `%s' #%d f=%d\n", s->output_section->name, s->output_section->index, s->output_section->flags); continue; } symsize = bfd_get_symtab_upper_bound (b); symbols = (asymbol **) xmalloc (symsize); nsyms = bfd_canonicalize_symtab (b, symbols); relsize = bfd_get_reloc_upper_bound (b, s); relocs = (arelent **) xmalloc ((size_t) relsize); nrelocs = bfd_canonicalize_reloc (b, s, relocs, symbols); for (i = 0; i < nrelocs; i++) { if (!relocs[i]->howto->pc_relative && relocs[i]->howto->type != pe_details->imagebase_reloc) { bfd_vma sym_vma; struct symbol_cache_entry *sym = *relocs[i]->sym_ptr_ptr; sym_vma = (relocs[i]->addend + sym->value + sym->section->vma + sym->section->output_offset + sym->section->output_section->vma); reloc_data[total_relocs].vma = sec_vma + relocs[i]->address; switch (relocs[i]->howto->bitsize*1000 + relocs[i]->howto->rightshift) { case 32000: reloc_data[total_relocs].type = 3; total_relocs++; break; default: /* xgettext:c-format */ einfo (_("%XError: %d-bit reloc in dll\n"), relocs[i]->howto->bitsize); break; } } } free (relocs); /* Warning: the allocated symbols are remembered in BFD and reused later, so don't free them! */ /* free (symbols); */ } } /* At this point, we have total_relocs relocation addresses in reloc_addresses, which are all suitable for the .reloc section. We must now create the new sections. */ qsort (reloc_data, total_relocs, sizeof (*reloc_data), reloc_sort); for (i = 0; i < total_relocs; i++) { unsigned long this_page = (reloc_data[i].vma >> 12); if (this_page != sec_page) { reloc_sz = (reloc_sz + 3) & ~3; /* 4-byte align */ reloc_sz += 8; sec_page = this_page; } reloc_sz += 2; } reloc_sz = (reloc_sz + 3) & ~3; /* 4-byte align */ reloc_d = (unsigned char *) xmalloc (reloc_sz); sec_page = (unsigned long) (-1); reloc_sz = 0; page_ptr = (unsigned long) (-1); page_count = 0; for (i = 0; i < total_relocs; i++) { unsigned long rva = reloc_data[i].vma - image_base; unsigned long this_page = (rva & ~0xfff); if (this_page != sec_page) { while (reloc_sz & 3) reloc_d[reloc_sz++] = 0; if (page_ptr != (unsigned long) (-1)) bfd_put_32 (abfd, reloc_sz - page_ptr, reloc_d + page_ptr + 4); bfd_put_32 (abfd, this_page, reloc_d + reloc_sz); page_ptr = reloc_sz; reloc_sz += 8; sec_page = this_page; page_count = 0; } bfd_put_16 (abfd, (rva & 0xfff) + (reloc_data[i].type<<12), reloc_d + reloc_sz); reloc_sz += 2; if (reloc_data[i].type == 4) { bfd_put_16 (abfd, reloc_data[i].extra, reloc_d + reloc_sz); reloc_sz += 2; } page_count++; } while (reloc_sz & 3) reloc_d[reloc_sz++] = 0; if (page_ptr != (unsigned long) (-1)) bfd_put_32 (abfd, reloc_sz - page_ptr, reloc_d + page_ptr + 4); while (reloc_sz < reloc_s->_raw_size) reloc_d[reloc_sz++] = 0; } /************************************************************************ Given the exiting def_file structure, print out a .DEF file that corresponds to it. ************************************************************************/ static void quoteput (s, f, needs_quotes) char *s; FILE * f; int needs_quotes; { char *cp; for (cp = s; *cp; cp++) if (*cp == '\'' || *cp == '"' || *cp == '\\' || isspace ((unsigned char) *cp) || *cp == ',' || *cp == ';') needs_quotes = 1; if (needs_quotes) { putc ('"', f); while (*s) { if (*s == '"' || *s == '\\') putc ('\\', f); putc (*s, f); s++; } putc ('"', f); } else fputs (s, f); } void pe_dll_generate_def_file (pe_out_def_filename) const char *pe_out_def_filename; { int i; FILE *out = fopen (pe_out_def_filename, "w"); if (out == NULL) { /* xgettext:c-format */ einfo (_("%s: Can't open output def file %s\n"), program_name, pe_out_def_filename); } if (pe_def_file) { if (pe_def_file->name) { if (pe_def_file->is_dll) fprintf (out, "LIBRARY "); else fprintf (out, "NAME "); quoteput (pe_def_file->name, out, 1); if (pe_data (output_bfd)->pe_opthdr.ImageBase) fprintf (out, " BASE=0x%lx", (unsigned long) pe_data (output_bfd)->pe_opthdr.ImageBase); fprintf (out, "\n"); } if (pe_def_file->description) { fprintf (out, "DESCRIPTION "); quoteput (pe_def_file->description, out, 1); fprintf (out, "\n"); } if (pe_def_file->version_minor != -1) fprintf (out, "VERSION %d.%d\n", pe_def_file->version_major, pe_def_file->version_minor); else if (pe_def_file->version_major != -1) fprintf (out, "VERSION %d\n", pe_def_file->version_major); if (pe_def_file->stack_reserve != -1 || pe_def_file->heap_reserve != -1) fprintf (out, "\n"); if (pe_def_file->stack_commit != -1) fprintf (out, "STACKSIZE 0x%x,0x%x\n", pe_def_file->stack_reserve, pe_def_file->stack_commit); else if (pe_def_file->stack_reserve != -1) fprintf (out, "STACKSIZE 0x%x\n", pe_def_file->stack_reserve); if (pe_def_file->heap_commit != -1) fprintf (out, "HEAPSIZE 0x%x,0x%x\n", pe_def_file->heap_reserve, pe_def_file->heap_commit); else if (pe_def_file->heap_reserve != -1) fprintf (out, "HEAPSIZE 0x%x\n", pe_def_file->heap_reserve); if (pe_def_file->num_section_defs > 0) { fprintf (out, "\nSECTIONS\n\n"); for (i = 0; i < pe_def_file->num_section_defs; i++) { fprintf (out, " "); quoteput (pe_def_file->section_defs[i].name, out, 0); if (pe_def_file->section_defs[i].class) { fprintf (out, " CLASS "); quoteput (pe_def_file->section_defs[i].class, out, 0); } if (pe_def_file->section_defs[i].flag_read) fprintf (out, " READ"); if (pe_def_file->section_defs[i].flag_write) fprintf (out, " WRITE"); if (pe_def_file->section_defs[i].flag_execute) fprintf (out, " EXECUTE"); if (pe_def_file->section_defs[i].flag_shared) fprintf (out, " SHARED"); fprintf (out, "\n"); } } if (pe_def_file->num_exports > 0) { fprintf (out, "\nEXPORTS\n\n"); for (i = 0; i < pe_def_file->num_exports; i++) { def_file_export *e = pe_def_file->exports + i; fprintf (out, " "); quoteput (e->name, out, 0); if (e->internal_name && strcmp (e->internal_name, e->name)) { fprintf (out, " = "); quoteput (e->internal_name, out, 0); } if (e->ordinal != -1) fprintf (out, " @%d", e->ordinal); if (e->flag_private) fprintf (out, " PRIVATE"); if (e->flag_constant) fprintf (out, " CONSTANT"); if (e->flag_noname) fprintf (out, " NONAME"); if (e->flag_data) fprintf (out, " DATA"); fprintf (out, "\n"); } } if (pe_def_file->num_imports > 0) { fprintf (out, "\nIMPORTS\n\n"); for (i = 0; i < pe_def_file->num_imports; i++) { def_file_import *im = pe_def_file->imports + i; fprintf (out, " "); if (im->internal_name && (!im->name || strcmp (im->internal_name, im->name))) { quoteput (im->internal_name, out, 0); fprintf (out, " = "); } quoteput (im->module->name, out, 0); fprintf (out, "."); if (im->name) quoteput (im->name, out, 0); else fprintf (out, "%d", im->ordinal); fprintf (out, "\n"); } } } else fprintf (out, _("; no contents available\n")); if (fclose (out) == EOF) { /* xgettext:c-format */ einfo (_("%P: Error closing file `%s'\n"), pe_out_def_filename); } } /************************************************************************ Generate the import library ************************************************************************/ static asymbol **symtab; static int symptr; static int tmp_seq; static const char *dll_filename; static char *dll_symname; #define UNDSEC (asection *) &bfd_und_section static asection * quick_section(abfd, name, flags, align) bfd *abfd; const char *name; int flags; int align; { asection *sec; asymbol *sym; sec = bfd_make_section_old_way (abfd, name); bfd_set_section_flags (abfd, sec, flags | SEC_ALLOC | SEC_LOAD | SEC_KEEP ); bfd_set_section_alignment (abfd, sec, align); /* remember to undo this before trying to link internally! */ sec->output_section = sec; sym = bfd_make_empty_symbol (abfd); symtab[symptr++] = sym; sym->name = sec->name; sym->section = sec; sym->flags = BSF_LOCAL; sym->value = 0; return sec; } static void quick_symbol (abfd, n1, n2, n3, sec, flags, addr) bfd *abfd; char *n1; char *n2; char *n3; asection *sec; int flags; int addr; { asymbol *sym; char *name = (char *) xmalloc (strlen (n1) + strlen (n2) + strlen (n3) + 1); strcpy (name, n1); strcat (name, n2); strcat (name, n3); sym = bfd_make_empty_symbol (abfd); sym->name = name; sym->section = sec; sym->flags = flags; sym->value = addr; symtab[symptr++] = sym; } static arelent *reltab = 0; static int relcount = 0, relsize = 0; static void quick_reloc (abfd, address, which_howto, symidx) bfd *abfd; int address; int which_howto; int symidx; { if (relcount >= (relsize-1)) { relsize += 10; if (reltab) reltab = (arelent *) xrealloc (reltab, relsize * sizeof (arelent)); else reltab = (arelent *) xmalloc (relsize * sizeof (arelent)); } reltab[relcount].address = address; reltab[relcount].addend = 0; reltab[relcount].howto = bfd_reloc_type_lookup (abfd, which_howto); reltab[relcount].sym_ptr_ptr = symtab + symidx; relcount++; } static void save_relocs (asection *sec) { int i; sec->relocation = reltab; sec->reloc_count = relcount; sec->orelocation = (arelent **) xmalloc ((relcount+1) * sizeof (arelent *)); for (i=0; iorelocation[i] = sec->relocation + i; sec->orelocation[relcount] = 0; sec->flags |= SEC_RELOC; reltab = 0; relcount = relsize = 0; } /* * .section .idata$2 * .global __head_my_dll * __head_my_dll: * .rva hname * .long 0 * .long 0 * .rva __my_dll_iname * .rva fthunk * * .section .idata$5 * .long 0 * fthunk: * * .section .idata$4 * .long 0 * hname: */ static bfd * make_head (parent) bfd *parent; { asection *id2, *id5, *id4; unsigned char *d2, *d5, *d4; char *oname; bfd *abfd; oname = (char *) xmalloc (20); sprintf (oname, "d%06d.o", tmp_seq); tmp_seq++; abfd = bfd_create (oname, parent); bfd_find_target (pe_details->object_target, abfd); bfd_make_writable (abfd); bfd_set_format (abfd, bfd_object); bfd_set_arch_mach (abfd, pe_details->bfd_arch, 0); symptr = 0; symtab = (asymbol **) xmalloc (6 * sizeof (asymbol *)); id2 = quick_section (abfd, ".idata$2", SEC_HAS_CONTENTS, 2); id5 = quick_section (abfd, ".idata$5", SEC_HAS_CONTENTS, 2); id4 = quick_section (abfd, ".idata$4", SEC_HAS_CONTENTS, 2); quick_symbol (abfd, U("_head_"), dll_symname, "", id2, BSF_GLOBAL, 0); quick_symbol (abfd, U(""), dll_symname, "_iname", UNDSEC, BSF_GLOBAL, 0); /* OK, pay attention here. I got confused myself looking back at it. We create a four-byte section to mark the beginning of the list, and we include an offset of 4 in the section, so that the pointer to the list points to the *end* of this section, which is the start of the list of sections from other objects. */ bfd_set_section_size (abfd, id2, 20); d2 = (unsigned char *) xmalloc (20); id2->contents = d2; memset (d2, 0, 20); d2[0] = d2[16] = 4; /* reloc addend */ quick_reloc (abfd, 0, BFD_RELOC_RVA, 2); quick_reloc (abfd, 12, BFD_RELOC_RVA, 4); quick_reloc (abfd, 16, BFD_RELOC_RVA, 1); save_relocs (id2); bfd_set_section_size (abfd, id5, 4); d5 = (unsigned char *) xmalloc (4); id5->contents = d5; memset (d5, 0, 4); bfd_set_section_size (abfd, id4, 4); d4 = (unsigned char *) xmalloc (4); id4->contents = d4; memset (d4, 0, 4); bfd_set_symtab (abfd, symtab, symptr); bfd_set_section_contents (abfd, id2, d2, 0, 20); bfd_set_section_contents (abfd, id5, d5, 0, 4); bfd_set_section_contents (abfd, id4, d4, 0, 4); bfd_make_readable (abfd); return abfd; } /* * .section .idata$4 * .long 0 * .section .idata$5 * .long 0 * .section idata$7 * .global __my_dll_iname *__my_dll_iname: * .asciz "my.dll" */ static bfd * make_tail (parent) bfd *parent; { asection *id4, *id5, *id7; unsigned char *d4, *d5, *d7; int len; char *oname; bfd *abfd; oname = (char *) xmalloc (20); sprintf (oname, "d%06d.o", tmp_seq); tmp_seq++; abfd = bfd_create (oname, parent); bfd_find_target (pe_details->object_target, abfd); bfd_make_writable (abfd); bfd_set_format (abfd, bfd_object); bfd_set_arch_mach (abfd, pe_details->bfd_arch, 0); symptr = 0; symtab = (asymbol **) xmalloc (5 * sizeof (asymbol *)); id4 = quick_section (abfd, ".idata$4", SEC_HAS_CONTENTS, 2); id5 = quick_section (abfd, ".idata$5", SEC_HAS_CONTENTS, 2); id7 = quick_section (abfd, ".idata$7", SEC_HAS_CONTENTS, 2); quick_symbol (abfd, U(""), dll_symname, "_iname", id7, BSF_GLOBAL, 0); bfd_set_section_size (abfd, id4, 4); d4 = (unsigned char *) xmalloc (4); id4->contents = d4; memset (d4, 0, 4); bfd_set_section_size (abfd, id5, 4); d5 = (unsigned char *) xmalloc (4); id5->contents = d5; memset (d5, 0, 4); len = strlen (dll_filename)+1; if (len & 1) len ++; bfd_set_section_size (abfd, id7, len); d7 = (unsigned char *) xmalloc (len); id7->contents = d7; strcpy (d7, dll_filename); bfd_set_symtab (abfd, symtab, symptr); bfd_set_section_contents (abfd, id4, d4, 0, 4); bfd_set_section_contents (abfd, id5, d5, 0, 4); bfd_set_section_contents (abfd, id7, d7, 0, len); bfd_make_readable (abfd); return abfd; } /* * .text * .global _function * .global ___imp_function * .global __imp__function *_function: * jmp *__imp__function: * * .section idata$7 * .long __head_my_dll * * .section .idata$5 *___imp_function: *__imp__function: *iat? * .section .idata$4 *iat? * .section .idata$6 *ID: * .short * .asciz "function" xlate? (add underscore, kill at) */ static unsigned char jmp_ix86_bytes[] = { 0xff, 0x25, 0x00, 0x00, 0x00, 0x00, 0x90, 0x90 }; static bfd * make_one (exp, parent) def_file_export *exp; bfd *parent; { asection *tx, *id7, *id5, *id4, *id6; unsigned char *td, *d7, *d5, *d4, *d6; int len; char *oname; bfd *abfd; unsigned char *jmp_bytes; int jmp_byte_count; switch (pe_details->pe_arch) { case PE_ARCH_i386: jmp_bytes = jmp_ix86_bytes; jmp_byte_count = sizeof (jmp_ix86_bytes); break; } oname = (char *) xmalloc (20); sprintf (oname, "d%06d.o", tmp_seq); tmp_seq++; abfd = bfd_create (oname, parent); bfd_find_target (pe_details->object_target, abfd); bfd_make_writable (abfd); bfd_set_format (abfd, bfd_object); bfd_set_arch_mach (abfd, pe_details->bfd_arch, 0); symptr = 0; symtab = (asymbol **) xmalloc (10 * sizeof (asymbol *)); tx = quick_section (abfd, ".text", SEC_CODE|SEC_HAS_CONTENTS, 2); id7 = quick_section (abfd, ".idata$7", SEC_HAS_CONTENTS, 2); id5 = quick_section (abfd, ".idata$5", SEC_HAS_CONTENTS, 2); id4 = quick_section (abfd, ".idata$4", SEC_HAS_CONTENTS, 2); id6 = quick_section (abfd, ".idata$6", SEC_HAS_CONTENTS, 2); quick_symbol (abfd, U(""), exp->internal_name, "", tx, BSF_GLOBAL, 0); quick_symbol (abfd, U("_head_"), dll_symname, "", UNDSEC, BSF_GLOBAL, 0); quick_symbol (abfd, U("__imp_"), exp->internal_name, "", id5, BSF_GLOBAL, 0); quick_symbol (abfd, U("_imp__"), exp->internal_name, "", id5, BSF_GLOBAL, 0); bfd_set_section_size (abfd, tx, jmp_byte_count); td = (unsigned char *) xmalloc (jmp_byte_count); tx->contents = td; memcpy (td, jmp_bytes, jmp_byte_count); switch (pe_details->pe_arch) { case PE_ARCH_i386: quick_reloc (abfd, 2, BFD_RELOC_32, 2); break; } save_relocs (tx); bfd_set_section_size (abfd, id7, 4); d7 = (unsigned char *) xmalloc (4); id7->contents = d7; memset (d7, 0, 4); quick_reloc (abfd, 0, BFD_RELOC_RVA, 6); save_relocs (id7); bfd_set_section_size (abfd, id5, 4); d5 = (unsigned char *) xmalloc (4); id5->contents = d5; memset (d5, 0, 4); if (exp->flag_noname) { d5[0] = exp->ordinal; d5[1] = exp->ordinal >> 8; d5[3] = 0x80; } else { quick_reloc (abfd, 0, BFD_RELOC_RVA, 4); save_relocs (id5); } bfd_set_section_size (abfd, id4, 4); d4 = (unsigned char *) xmalloc (4); id4->contents = d4; memset (d4, 0, 4); if (exp->flag_noname) { d5[0] = exp->ordinal; d5[1] = exp->ordinal >> 8; d5[3] = 0x80; } else { quick_reloc (abfd, 0, BFD_RELOC_RVA, 4); save_relocs (id4); } if (exp->flag_noname) { len = 0; bfd_set_section_size (abfd, id6, 0); } else { len = strlen (exp->name) + 3; if (len & 1) len++; bfd_set_section_size (abfd, id6, len); d6 = (unsigned char *) xmalloc (len); id6->contents = d6; memset (d6, 0, len); d6[0] = exp->hint & 0xff; d6[1] = exp->hint >> 8; strcpy (d6+2, exp->name); } bfd_set_symtab (abfd, symtab, symptr); bfd_set_section_contents (abfd, tx, td, 0, jmp_byte_count); bfd_set_section_contents (abfd, id7, d7, 0, 4); bfd_set_section_contents (abfd, id5, d5, 0, 4); bfd_set_section_contents (abfd, id4, d4, 0, 4); if (!exp->flag_noname) bfd_set_section_contents (abfd, id6, d6, 0, len); bfd_make_readable (abfd); return abfd; } void pe_dll_generate_implib (def, impfilename) def_file *def; const char *impfilename; { int i; bfd *ar_head; bfd *ar_tail; bfd *outarch; bfd *head = 0; dll_filename = def->name; if (dll_filename == 0) { dll_filename = dll_name; for (i=0; impfilename[i]; i++) if (impfilename[i] == '/' || impfilename[i] == '\\') dll_filename = impfilename+1; } dll_symname = xstrdup (dll_filename); for (i=0; dll_symname[i]; i++) if (!isalnum ((unsigned char) dll_symname[i])) dll_symname[i] = '_'; unlink (impfilename); outarch = bfd_openw (impfilename, 0); if (!outarch) { /* xgettext:c-format */ einfo (_("%XCan't open .lib file: %s\n"), impfilename); return; } /* xgettext:c-format */ einfo (_("Creating library file: %s\n"), impfilename); bfd_set_format (outarch, bfd_archive); outarch->has_armap = 1; /* Work out a reasonable size of things to put onto one line. */ ar_head = make_head (outarch); for (i = 0; inum_exports; i++) { /* The import library doesn't know about the internal name */ char *internal = def->exports[i].internal_name; bfd *n; def->exports[i].internal_name = def->exports[i].name; n = make_one (def->exports+i, outarch); n->next = head; head = n; def->exports[i].internal_name = internal; } ar_tail = make_tail (outarch); if (ar_head == NULL || ar_tail == NULL) return; /* Now stick them all into the archive */ ar_head->next = head; ar_tail->next = ar_head; head = ar_tail; if (! bfd_set_archive_head (outarch, head)) einfo ("%Xbfd_set_archive_head: %s\n", bfd_errmsg (bfd_get_error ())); if (! bfd_close (outarch)) einfo ("%Xbfd_close %s: %s\n", impfilename, bfd_errmsg (bfd_get_error ())); while (head != NULL) { bfd *n = head->next; bfd_close (head); head = n; } } static void add_bfd_to_link (abfd, name, link_info) bfd *abfd; char *name; struct bfd_link_info *link_info; { lang_input_statement_type *fake_file; fake_file = lang_add_input_file (name, lang_input_file_is_fake_enum, NULL); fake_file->the_bfd = abfd; ldlang_add_file (fake_file); if (!bfd_link_add_symbols (abfd, link_info)) einfo ("%Xaddsym %s: %s\n", name, bfd_errmsg (bfd_get_error ())); } void pe_process_import_defs (output_bfd, link_info) bfd *output_bfd; struct bfd_link_info *link_info; { def_file_module *module; pe_dll_id_target(bfd_get_target (output_bfd)); if (!pe_def_file) return; for (module = pe_def_file->modules; module; module = module->next) { int i, do_this_dll; dll_filename = module->name; dll_symname = xstrdup (module->name); for (i=0; dll_symname[i]; i++) if (!isalnum (dll_symname[i])) dll_symname[i] = '_'; do_this_dll = 0; for (i=0; inum_imports; i++) if (pe_def_file->imports[i].module == module) { def_file_export exp; struct bfd_link_hash_entry *blhe; /* see if we need this import */ char *name = (char *) xmalloc (strlen (pe_def_file->imports[i].internal_name) + 2); sprintf (name, "%s%s", U(""), pe_def_file->imports[i].internal_name); blhe = bfd_link_hash_lookup (link_info->hash, name, false, false, false); free (name); if (blhe && blhe->type == bfd_link_hash_undefined) { bfd *one; /* we do */ if (!do_this_dll) { bfd *ar_head = make_head (output_bfd); add_bfd_to_link (ar_head, ar_head->filename, link_info); do_this_dll = 1; } exp.internal_name = pe_def_file->imports[i].internal_name; exp.name = pe_def_file->imports[i].name; exp.ordinal = pe_def_file->imports[i].ordinal; exp.hint = exp.ordinal >= 0 ? exp.ordinal : 0; exp.flag_private = 0; exp.flag_constant = 0; exp.flag_data = 0; exp.flag_noname = exp.name ? 0 : 1; one = make_one (&exp, output_bfd); add_bfd_to_link (one, one->filename, link_info); } } if (do_this_dll) { bfd *ar_tail = make_tail (output_bfd); add_bfd_to_link (ar_tail, ar_tail->filename, link_info); } free (dll_symname); } } /************************************************************************ We were handed a *.DLL file. Parse it and turn it into a set of IMPORTS directives in the def file. Return true if the file was handled, false if not. ************************************************************************/ static unsigned int pe_get16 (abfd, where) bfd *abfd; int where; { unsigned char b[2]; bfd_seek (abfd, where, SEEK_SET); bfd_read (b, 1, 2, abfd); return b[0] + (b[1]<<8); } static unsigned int pe_get32 (abfd, where) bfd *abfd; int where; { unsigned char b[4]; bfd_seek (abfd, where, SEEK_SET); bfd_read (b, 1, 4, abfd); return b[0] + (b[1]<<8) + (b[2]<<16) + (b[3]<<24); } #if 0 /* This is not currently used. */ static unsigned int pe_as16 (ptr) void *ptr; { unsigned char *b = ptr; return b[0] + (b[1]<<8); } #endif static unsigned int pe_as32 (ptr) void *ptr; { unsigned char *b = ptr; return b[0] + (b[1]<<8) + (b[2]<<16) + (b[3]<<24); } boolean pe_implied_import_dll (filename) const char *filename; { bfd *dll; unsigned long pe_header_offset, opthdr_ofs, num_entries, i; unsigned long export_rva, export_size, nsections, secptr, expptr; unsigned char *expdata, *erva; unsigned long name_rvas, ordinals, nexp, ordbase; const char *dll_name; /* No, I can't use bfd here. kernel32.dll puts its export table in the middle of the .rdata section. */ dll = bfd_openr (filename, pe_details->target_name); if (!dll) { einfo ("%Xopen %s: %s\n", filename, bfd_errmsg (bfd_get_error ())); return false; } /* PEI dlls seem to be bfd_objects */ if (!bfd_check_format (dll, bfd_object)) { einfo ("%X%s: this doesn't appear to be a DLL\n", filename); return false; } dll_name = filename; for (i=0; filename[i]; i++) if (filename[i] == '/' || filename[i] == '\\' || filename[i] == ':') dll_name = filename + i + 1; pe_header_offset = pe_get32 (dll, 0x3c); opthdr_ofs = pe_header_offset + 4 + 20; num_entries = pe_get32 (dll, opthdr_ofs + 92); if (num_entries < 1) /* no exports */ return false; export_rva = pe_get32 (dll, opthdr_ofs + 96); export_size = pe_get32 (dll, opthdr_ofs + 100); nsections = pe_get16 (dll, pe_header_offset + 4 + 2); secptr = (pe_header_offset + 4 + 20 + pe_get16 (dll, pe_header_offset + 4 + 16)); expptr = 0; for (i=0; i export_rva) { expptr = fptr + (export_rva - vaddr); if (export_rva + export_size > vaddr + vsize) export_size = vsize - (export_rva - vaddr); break; } } expdata = (unsigned char *) xmalloc (export_size); bfd_seek (dll, expptr, SEEK_SET); bfd_read (expdata, 1, export_size, dll); erva = expdata - export_rva; if (pe_def_file == 0) pe_def_file = def_file_empty(); nexp = pe_as32 (expdata+24); name_rvas = pe_as32 (expdata+32); ordinals = pe_as32 (expdata+36); ordbase = pe_as32 (expdata+16); for (i=0; ipe_opthdr.ImageBase; generate_reloc (abfd, info); if (reloc_sz > 0) { bfd_set_section_size (filler_bfd, reloc_s, reloc_sz); /* Resize the sections. */ lang_size_sections (stat_ptr->head, abs_output_section, &stat_ptr->head, 0, (bfd_vma) 0, false); /* Redo special stuff. */ ldemul_after_allocation (); /* Do the assignments again. */ lang_do_assignments (stat_ptr->head, abs_output_section, (fill_type) 0, (bfd_vma) 0); } fill_edata (abfd, info); pe_data (abfd)->dll = 1; edata_s->contents = edata_d; reloc_s->contents = reloc_d; } void pe_exe_fill_sections (abfd, info) bfd *abfd; struct bfd_link_info *info; { pe_dll_id_target (bfd_get_target (abfd)); image_base = pe_data (abfd)->pe_opthdr.ImageBase; generate_reloc (abfd, info); if (reloc_sz > 0) { bfd_set_section_size (filler_bfd, reloc_s, reloc_sz); /* Resize the sections. */ lang_size_sections (stat_ptr->head, abs_output_section, &stat_ptr->head, 0, (bfd_vma) 0, false); /* Redo special stuff. */ ldemul_after_allocation (); /* Do the assignments again. */ lang_do_assignments (stat_ptr->head, abs_output_section, (fill_type) 0, (bfd_vma) 0); } reloc_s->contents = reloc_d; }