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/* Routines to help build PEI-format DLLs (Win32 etc) Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc. Written by DJ Delorie <dj@cygnus.com> This file is part of the GNU Binutils. This program 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 3 of the License, or (at your option) any later version. This program 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 this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ #include "sysdep.h" #include "bfd.h" #include "bfdlink.h" #include "libiberty.h" #include "filenames.h" #include "safe-ctype.h" #include <time.h> #include "ld.h" #include "ldexp.h" #include "ldlang.h" #include "ldwrite.h" #include "ldmisc.h" #include <ldgram.h> #include "ldmain.h" #include "ldfile.h" #include "ldemul.h" #include "coff/internal.h" #include "../bfd/libcoff.h" #include "deffile.h" #ifdef pe_use_x86_64 #define PE_IDATA4_SIZE 8 #define PE_IDATA5_SIZE 8 #include "pep-dll.h" #undef AOUTSZ #define AOUTSZ PEPAOUTSZ #define PEAOUTHDR PEPAOUTHDR #else #include "pe-dll.h" #endif #ifndef PE_IDATA4_SIZE #define PE_IDATA4_SIZE 4 #endif #ifndef PE_IDATA5_SIZE #define PE_IDATA5_SIZE 4 #endif /* 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 and ld/emultempl/pep.em. */ /* Auto-import feature by Paul Sokolovsky Quick facts: 1. With this feature on, DLL clients can import variables from DLL without any concern from their side (for example, without any source code modifications). 2. This is done completely in bounds of the PE specification (to be fair, there's a place where it pokes nose out of, but in practice it works). So, resulting module can be used with any other PE compiler/linker. 3. Auto-import is fully compatible with standard import method and they can be mixed together. 4. Overheads: space: 8 bytes per imported symbol, plus 20 for each reference to it; load time: negligible; virtual/physical memory: should be less than effect of DLL relocation, and I sincerely hope it doesn't affect DLL sharability (too much). Idea The obvious and only way to get rid of dllimport insanity is to make client access variable directly in the DLL, bypassing extra dereference. I.e., whenever client contains something like mov dll_var,%eax, address of dll_var in the command should be relocated to point into loaded DLL. The aim is to make OS loader do so, and than make ld help with that. Import section of PE made following way: there's a vector of structures each describing imports from particular DLL. Each such structure points to two other parallel vectors: one holding imported names, and one which will hold address of corresponding imported name. So, the solution is de-vectorize these structures, making import locations be sparse and pointing directly into code. Before continuing, it is worth a note that, while authors strives to make PE act ELF-like, there're some other people make ELF act PE-like: elfvector, ;-) . Implementation For each reference of data symbol to be imported from DLL (to set of which belong symbols with name <sym>, if __imp_<sym> is found in implib), the import fixup entry is generated. That entry is of type IMAGE_IMPORT_DESCRIPTOR and stored in .idata$2 subsection. Each fixup entry contains pointer to symbol's address within .text section (marked with __fuN_<sym> symbol, where N is integer), pointer to DLL name (so, DLL name is referenced by multiple entries), and pointer to symbol name thunk. Symbol name thunk is singleton vector (__nm_th_<symbol>) pointing to IMAGE_IMPORT_BY_NAME structure (__nm_<symbol>) directly containing imported name. Here comes that "on the edge" problem mentioned above: PE specification rambles that name vector (OriginalFirstThunk) should run in parallel with addresses vector (FirstThunk), i.e. that they should have same number of elements and terminated with zero. We violate this, since FirstThunk points directly into machine code. But in practice, OS loader implemented the sane way: it goes thru OriginalFirstThunk and puts addresses to FirstThunk, not something else. It once again should be noted that dll and symbol name structures are reused across fixup entries and should be there anyway to support standard import stuff, so sustained overhead is 20 bytes per reference. Other question is whether having several IMAGE_IMPORT_DESCRIPTORS for the same DLL is possible. Answer is yes, it is done even by native compiler/linker (libth32's functions are in fact reside in windows9x kernel32.dll, so if you use it, you have two IMAGE_IMPORT_DESCRIPTORS for kernel32.dll). Yet other question is whether referencing the same PE structures several times is valid. The answer is why not, prohibiting that (detecting violation) would require more work on behalf of loader than not doing it. See also: ld/emultempl/pe.em and ld/emultempl/pep.em. */ static void add_bfd_to_link (bfd *, const char *, struct bfd_link_info *); /* For emultempl/pe.em. */ def_file * pe_def_file = 0; int pe_dll_export_everything = 0; int pe_dll_exclude_all_symbols = 0; int pe_dll_do_default_excludes = 1; int pe_dll_kill_ats = 0; int pe_dll_stdcall_aliases = 0; int pe_dll_warn_dup_exports = 0; int pe_dll_compat_implib = 0; int pe_dll_extra_pe_debug = 0; int pe_use_nul_prefixed_import_tables = 0; int pe_use_coff_long_section_names = -1; int pe_leading_underscore = -1; /* Static variables and types. */ static bfd_vma image_base; static bfd *filler_bfd; static struct bfd_section *edata_s, *reloc_s; static unsigned char *edata_d, *reloc_d; static size_t edata_sz, reloc_sz; static int runtime_pseudo_relocs_created = 0; static int runtime_pseudp_reloc_v2_init = 0; typedef struct { const char *name; int len; } autofilter_entry_type; typedef struct { const char *target_name; const char *object_target; unsigned int imagebase_reloc; int pe_arch; int bfd_arch; bfd_boolean underscored; const autofilter_entry_type* autofilter_symbollist; } pe_details_type; static const autofilter_entry_type autofilter_symbollist_generic[] = { { STRING_COMMA_LEN ("_NULL_IMPORT_DESCRIPTOR") }, /* Entry point symbols. */ { STRING_COMMA_LEN ("DllMain") }, { STRING_COMMA_LEN ("DllMainCRTStartup") }, { STRING_COMMA_LEN ("_DllMainCRTStartup") }, /* Runtime pseudo-reloc. */ { STRING_COMMA_LEN ("_pei386_runtime_relocator") }, { STRING_COMMA_LEN ("do_pseudo_reloc") }, { NULL, 0 } }; static const autofilter_entry_type autofilter_symbollist_i386[] = { { STRING_COMMA_LEN ("_NULL_IMPORT_DESCRIPTOR") }, /* Entry point symbols, and entry hooks. */ { STRING_COMMA_LEN ("cygwin_crt0") }, #ifdef pe_use_x86_64 { STRING_COMMA_LEN ("DllMain") }, { STRING_COMMA_LEN ("DllEntryPoint") }, { STRING_COMMA_LEN ("DllMainCRTStartup") }, { STRING_COMMA_LEN ("_cygwin_dll_entry") }, { STRING_COMMA_LEN ("_cygwin_crt0_common") }, { STRING_COMMA_LEN ("_cygwin_noncygwin_dll_entry") }, #else { STRING_COMMA_LEN ("DllMain@12") }, { STRING_COMMA_LEN ("DllEntryPoint@0") }, { STRING_COMMA_LEN ("DllMainCRTStartup@12") }, { STRING_COMMA_LEN ("_cygwin_dll_entry@12") }, { STRING_COMMA_LEN ("_cygwin_crt0_common@8") }, { STRING_COMMA_LEN ("_cygwin_noncygwin_dll_entry@12") }, { STRING_COMMA_LEN ("cygwin_attach_dll") }, #endif { STRING_COMMA_LEN ("cygwin_premain0") }, { STRING_COMMA_LEN ("cygwin_premain1") }, { STRING_COMMA_LEN ("cygwin_premain2") }, { STRING_COMMA_LEN ("cygwin_premain3") }, /* Runtime pseudo-reloc. */ { STRING_COMMA_LEN ("_pei386_runtime_relocator") }, { STRING_COMMA_LEN ("do_pseudo_reloc") }, /* Global vars that should not be exported. */ { STRING_COMMA_LEN ("impure_ptr") }, { STRING_COMMA_LEN ("_impure_ptr") }, { STRING_COMMA_LEN ("_fmode") }, { STRING_COMMA_LEN ("environ") }, { NULL, 0 } }; #define PE_ARCH_i386 1 #define PE_ARCH_sh 2 #define PE_ARCH_mips 3 #define PE_ARCH_arm 4 #define PE_ARCH_arm_epoc 5 #define PE_ARCH_arm_wince 6 /* Don't make it constant as underscore mode gets possibly overriden by target or -(no-)leading-underscore option. */ static pe_details_type pe_detail_list[] = { { #ifdef pe_use_x86_64 "pei-x86-64", "pe-x86-64", 3 /* R_IMAGEBASE */, #else "pei-i386", "pe-i386", 7 /* R_IMAGEBASE */, #endif PE_ARCH_i386, bfd_arch_i386, #ifdef pe_use_x86_64 FALSE, #else TRUE, #endif autofilter_symbollist_i386 }, { "pei-shl", "pe-shl", 16 /* R_SH_IMAGEBASE */, PE_ARCH_sh, bfd_arch_sh, TRUE, autofilter_symbollist_generic }, { "pei-mips", "pe-mips", 34 /* MIPS_R_RVA */, PE_ARCH_mips, bfd_arch_mips, FALSE, autofilter_symbollist_generic }, { "pei-arm-little", "pe-arm-little", 11 /* ARM_RVA32 */, PE_ARCH_arm, bfd_arch_arm, TRUE, autofilter_symbollist_generic }, { "epoc-pei-arm-little", "epoc-pe-arm-little", 11 /* ARM_RVA32 */, PE_ARCH_arm_epoc, bfd_arch_arm, FALSE, autofilter_symbollist_generic }, { "pei-arm-wince-little", "pe-arm-wince-little", 2, /* ARM_RVA32 on Windows CE, see bfd/coff-arm.c. */ PE_ARCH_arm_wince, bfd_arch_arm, FALSE, autofilter_symbollist_generic }, { NULL, NULL, 0, 0, 0, FALSE, NULL } }; static const pe_details_type *pe_details; /* Do not specify library suffix explicitly, to allow for dllized versions. */ static const autofilter_entry_type autofilter_liblist[] = { { STRING_COMMA_LEN ("libcegcc") }, { STRING_COMMA_LEN ("libcygwin") }, { STRING_COMMA_LEN ("libgcc") }, { STRING_COMMA_LEN ("libgcc_s") }, { STRING_COMMA_LEN ("libstdc++") }, { STRING_COMMA_LEN ("libmingw32") }, { STRING_COMMA_LEN ("libmingwex") }, { STRING_COMMA_LEN ("libg2c") }, { STRING_COMMA_LEN ("libsupc++") }, { STRING_COMMA_LEN ("libobjc") }, { STRING_COMMA_LEN ("libgcj") }, { NULL, 0 } }; /* Regardless of the suffix issue mentioned above, we must ensure that we do not falsely match on a leading substring, such as when libtool builds libstdc++ as a DLL using libsupc++convenience.a as an intermediate. This routine ensures that the leading part of the name matches and that it is followed by only an optional version suffix and a file extension, returning zero if so or -1 if not. */ static int libnamencmp (const char *libname, const autofilter_entry_type *afptr) { if (filename_ncmp (libname, afptr->name, afptr->len)) return -1; libname += afptr->len; /* Be liberal in interpreting what counts as a version suffix; we accept anything that has a dash to separate it from the name and begins with a digit. */ if (libname[0] == '-') { if (!ISDIGIT (*++libname)) return -1; /* Ensure the filename has an extension. */ while (*++libname != '.') if (!*libname) return -1; } else if (libname[0] != '.') return -1; return 0; } static const autofilter_entry_type autofilter_objlist[] = { { STRING_COMMA_LEN ("crt0.o") }, { STRING_COMMA_LEN ("crt1.o") }, { STRING_COMMA_LEN ("crt2.o") }, { STRING_COMMA_LEN ("dllcrt1.o") }, { STRING_COMMA_LEN ("dllcrt2.o") }, { STRING_COMMA_LEN ("gcrt0.o") }, { STRING_COMMA_LEN ("gcrt1.o") }, { STRING_COMMA_LEN ("gcrt2.o") }, { STRING_COMMA_LEN ("crtbegin.o") }, { STRING_COMMA_LEN ("crtend.o") }, { NULL, 0 } }; static const autofilter_entry_type autofilter_symbolprefixlist[] = { /* _imp_ is treated specially, as it is always underscored. */ /* { STRING_COMMA_LEN ("_imp_") }, */ /* Don't export some c++ symbols. */ { STRING_COMMA_LEN ("__rtti_") }, { STRING_COMMA_LEN ("__builtin_") }, /* Don't re-export auto-imported symbols. */ { STRING_COMMA_LEN ("__nm_") }, /* Don't export symbols specifying internal DLL layout. */ { STRING_COMMA_LEN ("_head_") }, { STRING_COMMA_LEN ("_IMPORT_DESCRIPTOR_") }, /* Don't export section labels or artificial symbols (eg ".weak.foo". */ { STRING_COMMA_LEN (".") }, { NULL, 0 } }; static const autofilter_entry_type autofilter_symbolsuffixlist[] = { { STRING_COMMA_LEN ("_iname") }, { STRING_COMMA_LEN ("_NULL_THUNK_DATA") }, { NULL, 0 } }; #define U(str) (pe_details->underscored ? "_" str : str) void pe_dll_id_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 || strcmp (pe_detail_list[i].object_target, target) == 0) { int u = pe_leading_underscore; /* Underscoring mode. -1 for use default. */ if (u == -1) bfd_get_target_info (target, NULL, NULL, &u, NULL); if (u == -1) abort (); pe_detail_list[i].underscored = (u != 0 ? TRUE : FALSE); pe_details = pe_detail_list + i; pe_leading_underscore = (u != 0 ? 1 : 0); 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 (const void *va, const void *vb) { bfd_vma a = ((const reloc_data_type *) va)->vma; bfd_vma b = ((const reloc_data_type *) vb)->vma; return (a > b) ? 1 : ((a < b) ? -1 : 0); } static int pe_export_sort (const void *va, const void *vb) { const def_file_export *a = va; const def_file_export *b = vb; char *an = a->name; char *bn = b->name; if (a->its_name) an = a->its_name; if (b->its_name) bn = b->its_name; return strcmp (an, bn); } /* 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 bfd_section **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_type type; } exclude_list_struct; static struct exclude_list_struct *excludes = 0; void pe_dll_add_excludes (const char *new_excludes, const exclude_type type) { 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 = xmalloc (sizeof (struct exclude_list_struct)); new_exclude->string = xmalloc (strlen (exclude_string) + 1); strcpy (new_exclude->string, exclude_string); new_exclude->type = type; new_exclude->next = excludes; excludes = new_exclude; } free (local_copy); } static bfd_boolean is_import (const char* n) { return (CONST_STRNEQ (n, "__imp_")); } /* abfd is a bfd containing n (or NULL) It can be used for contextual checks. */ static int auto_export (bfd *abfd, def_file *d, const char *n) { def_file_export key; struct exclude_list_struct *ex; const autofilter_entry_type *afptr; const char * libname = NULL; if (abfd && abfd->my_archive) libname = lbasename (abfd->my_archive->filename); key.name = key.its_name = (char *) n; /* Return false if n is in the d->exports table. */ if (bsearch (&key, d->exports, d->num_exports, sizeof (pe_def_file->exports[0]), pe_export_sort)) return 0; if (pe_dll_do_default_excludes) { const char * p; int len; if (pe_dll_extra_pe_debug) printf ("considering exporting: %s, abfd=%p, abfd->my_arc=%p\n", n, abfd, abfd->my_archive); /* First of all, make context checks: Don't export anything from standard libs. */ if (libname) { afptr = autofilter_liblist; while (afptr->name) { if (libnamencmp (libname, afptr) == 0 ) return 0; afptr++; } } /* Next, exclude symbols from certain startup objects. */ if (abfd && (p = lbasename (abfd->filename))) { afptr = autofilter_objlist; while (afptr->name) { if (strcmp (p, afptr->name) == 0) return 0; afptr++; } } /* Don't try to blindly exclude all symbols that begin with '__'; this was tried and it is too restrictive. Instead we have a target specific list to use: */ afptr = pe_details->autofilter_symbollist; while (afptr->name) { if (strcmp (n, afptr->name) == 0) return 0; afptr++; } /* Next, exclude symbols starting with ... */ afptr = autofilter_symbolprefixlist; while (afptr->name) { if (strncmp (n, afptr->name, afptr->len) == 0) return 0; afptr++; } /* Finally, exclude symbols ending with ... */ len = strlen (n); afptr = autofilter_symbolsuffixlist; while (afptr->name) { if ((len >= afptr->len) /* Add 1 to insure match with trailing '\0'. */ && strncmp (n + len - afptr->len, afptr->name, afptr->len + 1) == 0) return 0; afptr++; } } for (ex = excludes; ex; ex = ex->next) { if (ex->type == EXCLUDELIBS) { if (libname && ((filename_cmp (libname, ex->string) == 0) || (strcasecmp ("ALL", ex->string) == 0))) return 0; } else if (ex->type == EXCLUDEFORIMPLIB) { if (filename_cmp (abfd->filename, ex->string) == 0) return 0; } else if (strcmp (n, ex->string) == 0) return 0; } return 1; } static void process_def_file_and_drectve (bfd *abfd ATTRIBUTE_UNUSED, struct bfd_link_info *info) { int i, j; struct bfd_link_hash_entry *blhe; bfd *b; struct bfd_section *s; def_file_export *e = 0; bfd_boolean resort_needed; 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) { long size = s->size; char *buf = xmalloc (size); bfd_get_section_contents (b, s, buf, 0, size); def_file_add_directive (pe_def_file, buf, size); free (buf); } } /* Process aligned common symbol information from the .drectve sections now; common symbol allocation is done before final link, so it will be too late to process them in process_embedded_commands() called from _bfd_coff_link_input_bfd(). */ if (pe_def_file->aligncomms) { def_file_aligncomm *ac = pe_def_file->aligncomms; while (ac) { struct coff_link_hash_entry *sym_hash; sym_hash = coff_link_hash_lookup (coff_hash_table (info), ac->symbol_name, FALSE, FALSE, FALSE); if (sym_hash && sym_hash->root.type == bfd_link_hash_common && sym_hash->root.u.c.p->alignment_power < (unsigned) ac->alignment) { sym_hash->root.u.c.p->alignment_power = (unsigned) ac->alignment; } ac = ac->next; } } /* If we are building an executable and there is nothing to export, we do not build an export table at all. */ if (info->executable && pe_def_file->num_exports == 0 && (!pe_dll_export_everything || pe_dll_exclude_all_symbols)) return; /* Now, maybe export everything else the default way. */ if ((pe_dll_export_everything || pe_def_file->num_exports == 0) && !pe_dll_exclude_all_symbols) { for (b = info->input_bfds; b; b = b->link_next) { asymbol **symbols; int nsyms; if (!bfd_generic_link_read_symbols (b)) { einfo (_("%B%F: could not read symbols: %E\n"), b); return; } symbols = bfd_get_outsymbols (b); nsyms = bfd_get_symcount (b); for (j = 0; j < nsyms; j++) { /* We should export symbols which are either global or not anything at all. (.bss data is the latter) We should not export undefined symbols. */ bfd_boolean would_export = symbols[j]->section != &bfd_und_section && ((symbols[j]->flags & BSF_GLOBAL) || (symbols[j]->flags == 0)); if (link_info.version_info && would_export) would_export = !bfd_hide_sym_by_version (link_info.version_info, symbols[j]->name); if (would_export) { const char *sn = symbols[j]->name; /* We should not re-export imported stuff. */ { char *name; if (is_import (sn)) continue; name = xmalloc (strlen ("__imp_") + strlen (sn) + 1); sprintf (name, "%s%s", "__imp_", sn); blhe = bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, FALSE); free (name); if (blhe && blhe->type == bfd_link_hash_defined) continue; } if (pe_details->underscored && *sn == '_') sn++; if (auto_export (b, pe_def_file, sn)) { int is_dup = 0; def_file_export *p; p = def_file_add_export (pe_def_file, sn, 0, -1, NULL, &is_dup); /* Fill data flag properly, from dlltool.c. */ if (!is_dup) p->flag_data = !(symbols[j]->flags & BSF_FUNCTION); } } } } } #undef NE #define NE pe_def_file->num_exports /* Don't create an empty export table. */ if (NE == 0) return; resort_needed = FALSE; /* 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. */ int lead_at = (*pe_def_file->exports[i].name == '@'); char *tmp = xstrdup (pe_def_file->exports[i].name + lead_at); char *tmp_at = strchr (tmp, '@'); if (tmp_at) *tmp_at = 0; else einfo (_("%XCannot export %s: invalid export name\n"), pe_def_file->exports[i].name); pe_def_file->exports[i].name = tmp; resort_needed = TRUE; } } } /* Re-sort the exports table as we have possibly changed the order by removing leading @. */ if (resort_needed) qsort (pe_def_file->exports, NE, sizeof (pe_def_file->exports[0]), pe_export_sort); if (pe_dll_stdcall_aliases) { for (i = 0; i < NE; i++) { if (is_import (pe_def_file->exports[i].name)) continue; if (strchr (pe_def_file->exports[i].name, '@')) { int is_dup = 1; int lead_at = (*pe_def_file->exports[i].name == '@'); char *tmp = xstrdup (pe_def_file->exports[i].name + lead_at); *(strchr (tmp, '@')) = 0; if (auto_export (NULL, pe_def_file, tmp)) def_file_add_export (pe_def_file, tmp, pe_def_file->exports[i].internal_name, -1, NULL, &is_dup); if (is_dup) free (tmp); } } } /* Convenience, but watch out for it changing. */ e = pe_def_file->exports; 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) { if (pe_dll_warn_dup_exports) /* xgettext:c-format */ einfo (_("%XError, duplicate EXPORT with ordinals: %s (%d vs %d)\n"), e[j - 1].name, e[j - 1].ordinal, e[i].ordinal); } else { if (pe_dll_warn_dup_exports) /* xgettext:c-format */ einfo (_("Warning, duplicate EXPORT: %s\n"), e[j - 1].name); } if (e[i].ordinal != -1) 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; if (e[i].name) free (e[i].name); if (e[i].internal_name) free (e[i].internal_name); if (e[i].its_name) free (e[i].its_name); } else { if (i != j) e[j] = e[i]; j++; } } pe_def_file->num_exports = j; /* == NE */ exported_symbol_offsets = xmalloc (NE * sizeof (bfd_vma)); exported_symbol_sections = xmalloc (NE * sizeof (struct bfd_section *)); memset (exported_symbol_sections, 0, NE * sizeof (struct bfd_section *)); max_ordinal = 0; min_ordinal = 65536; count_exported = 0; count_exported_byname = 0; count_with_ordinals = 0; for (i = 0; i < NE; i++) { char *name; name = xmalloc (strlen (pe_def_file->exports[i].internal_name) + 2); if (pe_details->underscored && (*pe_def_file->exports[i].internal_name != '@')) { *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 || (blhe->type == bfd_link_hash_common))) { count_exported++; if (!pe_def_file->exports[i].flag_noname) count_exported_byname++; /* Only fill in the sections. The actual offsets are computed in fill_exported_offsets() after common symbols are laid out. */ if (blhe->type == bfd_link_hash_defined) exported_symbol_sections[i] = blhe->u.def.section; else exported_symbol_sections[i] = blhe->u.c.p->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++; } } /* Check for forward exports. These are indicated in DEF files by an export directive of the form NAME1 = MODULE-NAME.EXTERNAL-NAME but we must take care not to be fooled when the user wants to export a symbol that actually really has a dot in it, so we only check for them here, after real defined symbols have already been matched. */ else if (strchr (pe_def_file->exports[i].internal_name, '.')) { count_exported++; if (!pe_def_file->exports[i].flag_noname) count_exported_byname++; pe_def_file->exports[i].flag_forward = 1; 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 (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", link_info.output_bfd); if (filler_bfd == NULL || !bfd_set_arch_mach (filler_bfd, bfd_get_arch (link_info.output_bfd), bfd_get_mach (link_info.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 (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 = 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] || pe_def_file->exports[i].flag_forward) { 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, ordinal 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; } if (pe_def_file->exports[i].its_name) name_table_size += strlen (pe_def_file->exports[i].its_name) + 1; else name_table_size += strlen (pe_def_file->exports[i].name) + 1; } /* Reserve space for the forward name. */ if (pe_def_file->exports[i].flag_forward) { name_table_size += strlen (pe_def_file->exports[i].internal_name) + 1; } } next_ordinal = min_ordinal; for (i = 0; i < NE; i++) if ((exported_symbol_sections[i] || pe_def_file->exports[i].flag_forward) && 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); } /* Fill the exported symbol offsets. The preliminary work has already been done in process_def_file_and_drectve(). */ static void fill_exported_offsets (bfd *abfd ATTRIBUTE_UNUSED, struct bfd_link_info *info) { int i; struct bfd_link_hash_entry *blhe; for (i = 0; i < pe_def_file->num_exports; i++) { char *name; name = xmalloc (strlen (pe_def_file->exports[i].internal_name) + 2); if (pe_details->underscored && *pe_def_file->exports[i].internal_name != '@') { *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) exported_symbol_offsets[i] = blhe->u.def.value; free (name); } } static void fill_edata (bfd *abfd, struct bfd_link_info *info ATTRIBUTE_UNUSED) { int s, hint; unsigned char *edirectory; unsigned char *eaddresses; unsigned char *enameptrs; unsigned char *eordinals; char *enamestr; time_t now; time (&now); edata_d = xmalloc (edata_sz); /* Note use of array pointer math here. */ edirectory = edata_d; eaddresses = edirectory + 40; enameptrs = eaddresses + 4 * export_table_size; eordinals = enameptrs + 4 * count_exported_byname; enamestr = (char *) eordinals + 2 * count_exported_byname; #define ERVA(ptr) (((unsigned char *)(ptr) - edata_d) \ + edata_s->output_section->vma - image_base) memset (edata_d, 0, edata_sz); 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); fill_exported_offsets (abfd, info); /* Ok, now for the filling in part. Scan alphabetically - ie the ordering in the exports[] table, rather than by ordinal - the ordering in the exported_symbol[] table. See dlltool.c and: http://sources.redhat.com/ml/binutils/2003-04/msg00379.html for more information. */ hint = 0; for (s = 0; s < NE; s++) { struct bfd_section *ssec = exported_symbol_sections[s]; if (pe_def_file->exports[s].ordinal != -1 && (pe_def_file->exports[s].flag_forward || ssec != NULL)) { int ord = pe_def_file->exports[s].ordinal; if (pe_def_file->exports[s].flag_forward) { bfd_put_32 (abfd, ERVA (enamestr), eaddresses + 4 * (ord - min_ordinal)); strcpy (enamestr, pe_def_file->exports[s].internal_name); enamestr += strlen (pe_def_file->exports[s].internal_name) + 1; } else { bfd_vma srva = (exported_symbol_offsets[s] + ssec->output_section->vma + ssec->output_offset); bfd_put_32 (abfd, srva - image_base, eaddresses + 4 * (ord - min_ordinal)); } if (!pe_def_file->exports[s].flag_noname) { char *ename = pe_def_file->exports[s].name; if (pe_def_file->exports[s].its_name) ename = pe_def_file->exports[s].its_name; bfd_put_32 (abfd, ERVA (enamestr), enameptrs); enameptrs += 4; strcpy (enamestr, ename); enamestr += strlen (enamestr) + 1; bfd_put_16 (abfd, ord - min_ordinal, eordinals); eordinals += 2; pe_def_file->exports[s].hint = hint++; } } } } static struct bfd_section *current_sec; void pe_walk_relocs_of_symbol (struct bfd_link_info *info, const char *name, int (*cb) (arelent *, asection *)) { bfd *b; asection *s; for (b = info->input_bfds; b; b = b->link_next) { asymbol **symbols; if (!bfd_generic_link_read_symbols (b)) { einfo (_("%B%F: could not read symbols: %E\n"), b); return; } symbols = bfd_get_outsymbols (b); for (s = b->sections; s; s = s->next) { arelent **relocs; int relsize, nrelocs, i; int flags = bfd_get_section_flags (b, s); /* Skip discarded linkonce sections. */ if (flags & SEC_LINK_ONCE && s->output_section == bfd_abs_section_ptr) continue; current_sec = s; relsize = bfd_get_reloc_upper_bound (b, s); relocs = xmalloc (relsize); nrelocs = bfd_canonicalize_reloc (b, s, relocs, symbols); for (i = 0; i < nrelocs; i++) { struct bfd_symbol *sym = *relocs[i]->sym_ptr_ptr; if (!strcmp (name, sym->name)) cb (relocs[i], s); } free (relocs); /* Warning: the allocated symbols are remembered in BFD and reused later, so don't free them! */ /* free (symbols); */ } } } /* Gather all the relocations and build the .reloc section. */ static void generate_reloc (bfd *abfd, struct bfd_link_info *info) { /* For .reloc stuff. */ reloc_data_type *reloc_data; int total_relocs = 0; int i; bfd_vma sec_page = (bfd_vma) -1; bfd_vma page_ptr, page_count; int bi; bfd *b; struct bfd_section *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 = 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; for (s = b->sections; s; s = s->next) { bfd_vma sec_vma = s->output_section->vma + s->output_offset; asymbol **symbols; /* 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; } if (!bfd_generic_link_read_symbols (b)) { einfo (_("%B%F: could not read symbols: %E\n"), b); return; } symbols = bfd_get_outsymbols (b); relsize = bfd_get_reloc_upper_bound (b, s); relocs = xmalloc (relsize); nrelocs = bfd_canonicalize_reloc (b, s, relocs, symbols); for (i = 0; i < nrelocs; i++) { if (pe_dll_extra_pe_debug) { struct bfd_symbol *sym = *relocs[i]->sym_ptr_ptr; printf ("rel: %s\n", sym->name); } if (!relocs[i]->howto->pc_relative && relocs[i]->howto->type != pe_details->imagebase_reloc) { struct bfd_symbol *sym = *relocs[i]->sym_ptr_ptr; /* Don't create relocs for undefined weak symbols. */ if (sym->flags == BSF_WEAK) { struct bfd_link_hash_entry *blhe = bfd_wrapped_link_hash_lookup (abfd, info, sym->name, FALSE, FALSE, FALSE); if (blhe && blhe->type == bfd_link_hash_undefweak) { /* Check aux sym and see if it is defined or not. */ struct coff_link_hash_entry *h, *h2; h = (struct coff_link_hash_entry *)blhe; if (h->symbol_class != C_NT_WEAK || h->numaux != 1) continue; h2 = h->auxbfd->tdata.coff_obj_data->sym_hashes [h->aux->x_sym.x_tagndx.l]; /* We don't want a base reloc if the aux sym is not found, undefined, or if it is the constant ABS zero default value. (We broaden that slightly by not testing the value, just the section; there's no reason we'd want a reference to any absolute address to get relocated during rebasing). */ if (!h2 || h2->root.type == bfd_link_hash_undefined || h2->root.u.def.section == &bfd_abs_section) continue; } else if (!blhe || blhe->type != bfd_link_hash_defined) continue; } /* Nor for Dwarf FDE references to discarded sections. */ else if (bfd_is_abs_section (sym->section->output_section)) { /* We only ignore relocs from .eh_frame sections, as they are discarded by the final link rather than resolved against the kept section. */ if (!strcmp (s->name, ".eh_frame")) continue; } reloc_data[total_relocs].vma = sec_vma + relocs[i]->address; #define BITS_AND_SHIFT(bits, shift) (bits * 1000 | shift) switch BITS_AND_SHIFT (relocs[i]->howto->bitsize, relocs[i]->howto->rightshift) { #ifdef pe_use_x86_64 case BITS_AND_SHIFT (64, 0): reloc_data[total_relocs].type = 10; total_relocs++; break; #endif case BITS_AND_SHIFT (32, 0): reloc_data[total_relocs].type = 3; total_relocs++; break; case BITS_AND_SHIFT (16, 0): reloc_data[total_relocs].type = 2; total_relocs++; break; case BITS_AND_SHIFT (16, 16): reloc_data[total_relocs].type = 4; /* FIXME: we can't know the symbol's right value yet, but we probably can safely assume that CE will relocate us in 64k blocks, so leaving it zero is safe. */ reloc_data[total_relocs].extra = 0; total_relocs++; break; case BITS_AND_SHIFT (26, 2): reloc_data[total_relocs].type = 5; total_relocs++; break; case BITS_AND_SHIFT (24, 2): /* FIXME: 0 is ARM_26D, it is defined in bfd/coff-arm.c Those ARM_xxx definitions should go in proper header someday. */ if (relocs[i]->howto->type == 0 /* Older GNU linkers used 5 instead of 0 for this reloc. */ || relocs[i]->howto->type == 5) /* This is an ARM_26D reloc, which is an ARM_26 reloc that has already been fully processed during a previous link stage, so ignore it here. */ break; /* Fall through. */ 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! */ } } /* 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++) { bfd_vma 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; if (reloc_data[i].type == 4) reloc_sz += 2; } reloc_sz = (reloc_sz + 3) & ~3; /* 4-byte align. */ reloc_d = xmalloc (reloc_sz); sec_page = (bfd_vma) -1; reloc_sz = 0; page_ptr = (bfd_vma) -1; page_count = 0; for (i = 0; i < total_relocs; i++) { bfd_vma rva = reloc_data[i].vma - image_base; bfd_vma this_page = (rva & ~0xfff); if (this_page != sec_page) { while (reloc_sz & 3) reloc_d[reloc_sz++] = 0; if (page_ptr != (bfd_vma) -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 != (bfd_vma) -1) bfd_put_32 (abfd, reloc_sz - page_ptr, reloc_d + page_ptr + 4); while (reloc_sz < reloc_s->size) reloc_d[reloc_sz++] = 0; } /* Given the exiting def_file structure, print out a .DEF file that corresponds to it. */ static void quoteput (char *s, FILE *f, int needs_quotes) { char *cp; for (cp = s; *cp; cp++) if (*cp == '\'' || *cp == '"' || *cp == '\\' || ISSPACE (*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 (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 (link_info.output_bfd)->pe_opthdr.ImageBase) { fprintf (out, " BASE=0x"); fprintf_vma (out, ((bfd_vma) pe_data (link_info.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, "EXPORTS\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); if (im->its_name) { fprintf (out, " == "); quoteput (im->its_name, out, 0); } 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 int tmp_seq2; static const char *dll_filename; static char *dll_symname; #define UNDSEC (asection *) &bfd_und_section static asection * quick_section (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 (bfd *abfd, const char *n1, const char *n2, const char *n3, asection *sec, int flags, int addr) { asymbol *sym; char *name = 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 (bfd *abfd, bfd_size_type address, int which_howto, int symidx) { if (relcount >= relsize - 1) { relsize += 10; if (reltab) reltab = xrealloc (reltab, relsize * sizeof (arelent)); else reltab = 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 = xmalloc ((relcount + 1) * sizeof (arelent *)); for (i = 0; i < relcount; i++) sec->orelocation[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 (bfd *parent) { asection *id2, *id5, *id4; unsigned char *d2, *d5, *d4; char *oname; bfd *abfd; oname = 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 = 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 = xmalloc (20); id2->contents = d2; memset (d2, 0, 20); if (pe_use_nul_prefixed_import_tables) d2[0] = d2[16] = PE_IDATA5_SIZE; /* 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); if (pe_use_nul_prefixed_import_tables) bfd_set_section_size (abfd, id5, PE_IDATA5_SIZE); else bfd_set_section_size (abfd, id5, 0); d5 = xmalloc (PE_IDATA5_SIZE); id5->contents = d5; memset (d5, 0, PE_IDATA5_SIZE); if (pe_use_nul_prefixed_import_tables) bfd_set_section_size (abfd, id4, PE_IDATA4_SIZE); else bfd_set_section_size (abfd, id4, 0); d4 = xmalloc (PE_IDATA4_SIZE); id4->contents = d4; memset (d4, 0, PE_IDATA4_SIZE); bfd_set_symtab (abfd, symtab, symptr); bfd_set_section_contents (abfd, id2, d2, 0, 20); if (pe_use_nul_prefixed_import_tables) { bfd_set_section_contents (abfd, id5, d5, 0, PE_IDATA5_SIZE); bfd_set_section_contents (abfd, id4, d4, 0, PE_IDATA4_SIZE); } else { bfd_set_section_contents (abfd, id5, d5, 0, 0); bfd_set_section_contents (abfd, id4, d4, 0, 0); } bfd_make_readable (abfd); return abfd; } /* .section .idata$4 .long 0 [.long 0] for PE+ .section .idata$5 .long 0 [.long 0] for PE+ .section idata$7 .global __my_dll_iname __my_dll_iname: .asciz "my.dll" */ static bfd * make_tail (bfd *parent) { asection *id4, *id5, *id7; unsigned char *d4, *d5, *d7; int len; char *oname; bfd *abfd; oname = 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 = 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, PE_IDATA4_SIZE); d4 = xmalloc (PE_IDATA4_SIZE); id4->contents = d4; memset (d4, 0, PE_IDATA4_SIZE); bfd_set_section_size (abfd, id5, PE_IDATA5_SIZE); d5 = xmalloc (PE_IDATA5_SIZE); id5->contents = d5; memset (d5, 0, PE_IDATA5_SIZE); len = strlen (dll_filename) + 1; if (len & 1) len++; bfd_set_section_size (abfd, id7, len); d7 = xmalloc (len); id7->contents = d7; strcpy ((char *) d7, dll_filename); /* If len was odd, the above strcpy leaves behind an undefined byte. That is harmless, but we set it to 0 just so the binary dumps are pretty. */ d7[len - 1] = 0; bfd_set_symtab (abfd, symtab, symptr); bfd_set_section_contents (abfd, id4, d4, 0, PE_IDATA4_SIZE); bfd_set_section_contents (abfd, id5, d5, 0, PE_IDATA5_SIZE); 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<ordinal>: .short <hint> .asciz "function" xlate? (add underscore, kill at) */ static const unsigned char jmp_ix86_bytes[] = { 0xff, 0x25, 0x00, 0x00, 0x00, 0x00, 0x90, 0x90 }; /* _function: mov.l ip+8,r0 mov.l @r0,r0 jmp @r0 nop .dw __imp_function */ static const unsigned char jmp_sh_bytes[] = { 0x01, 0xd0, 0x02, 0x60, 0x2b, 0x40, 0x09, 0x00, 0x00, 0x00, 0x00, 0x00 }; /* _function: lui $t0,<high:__imp_function> lw $t0,<low:__imp_function> jr $t0 nop */ static const unsigned char jmp_mips_bytes[] = { 0x00, 0x00, 0x08, 0x3c, 0x00, 0x00, 0x08, 0x8d, 0x08, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00 }; static const unsigned char jmp_arm_bytes[] = { 0x00, 0xc0, 0x9f, 0xe5, /* ldr ip, [pc] */ 0x00, 0xf0, 0x9c, 0xe5, /* ldr pc, [ip] */ 0, 0, 0, 0 }; static bfd * make_one (def_file_export *exp, bfd *parent, bfd_boolean include_jmp_stub) { asection *tx, *id7, *id5, *id4, *id6; unsigned char *td = NULL, *d7, *d5, *d4, *d6 = NULL; int len; char *oname; bfd *abfd; const unsigned char *jmp_bytes = NULL; int jmp_byte_count = 0; /* Include the jump stub section only if it is needed. A jump stub is needed if the symbol being imported <sym> is a function symbol and there is at least one undefined reference to that symbol. In other words, if all the import references to <sym> are explicitly through _declspec(dllimport) then the jump stub is not needed. */ if (include_jmp_stub) { switch (pe_details->pe_arch) { case PE_ARCH_i386: jmp_bytes = jmp_ix86_bytes; jmp_byte_count = sizeof (jmp_ix86_bytes); break; case PE_ARCH_sh: jmp_bytes = jmp_sh_bytes; jmp_byte_count = sizeof (jmp_sh_bytes); break; case PE_ARCH_mips: jmp_bytes = jmp_mips_bytes; jmp_byte_count = sizeof (jmp_mips_bytes); break; case PE_ARCH_arm: case PE_ARCH_arm_epoc: case PE_ARCH_arm_wince: jmp_bytes = jmp_arm_bytes; jmp_byte_count = sizeof (jmp_arm_bytes); break; default: abort (); } } oname = 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 = xmalloc (12 * sizeof (asymbol *)); tx = quick_section (abfd, ".text", SEC_CODE | SEC_HAS_CONTENTS | SEC_READONLY, 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); if (*exp->internal_name == '@') { quick_symbol (abfd, U ("_head_"), dll_symname, "", UNDSEC, BSF_GLOBAL, 0); if (include_jmp_stub) quick_symbol (abfd, "", exp->internal_name, "", tx, BSF_GLOBAL, 0); quick_symbol (abfd, "__imp_", exp->internal_name, "", id5, BSF_GLOBAL, 0); /* Fastcall applies only to functions, so no need for auto-import symbol. */ } else { quick_symbol (abfd, U ("_head_"), dll_symname, "", UNDSEC, BSF_GLOBAL, 0); if (include_jmp_stub) quick_symbol (abfd, U (""), exp->internal_name, "", tx, BSF_GLOBAL, 0); quick_symbol (abfd, "__imp_", U (""), exp->internal_name, id5, BSF_GLOBAL, 0); /* Symbol to reference ord/name of imported data symbol, used to implement auto-import. */ if (exp->flag_data) quick_symbol (abfd, "__nm_", U (""), exp->internal_name, id6, BSF_GLOBAL,0); } if (pe_dll_compat_implib) quick_symbol (abfd, "___imp_", exp->internal_name, "", id5, BSF_GLOBAL, 0); if (include_jmp_stub) { bfd_set_section_size (abfd, tx, jmp_byte_count); td = xmalloc (jmp_byte_count); tx->contents = td; memcpy (td, jmp_bytes, jmp_byte_count); switch (pe_details->pe_arch) { case PE_ARCH_i386: #ifdef pe_use_x86_64 quick_reloc (abfd, 2, BFD_RELOC_32_PCREL, 2); #else /* Mark this object as SAFESEH compatible. */ quick_symbol (abfd, "", "@feat.00", "", bfd_abs_section_ptr, BSF_LOCAL, 1); quick_reloc (abfd, 2, BFD_RELOC_32, 2); #endif break; case PE_ARCH_sh: quick_reloc (abfd, 8, BFD_RELOC_32, 2); break; case PE_ARCH_mips: quick_reloc (abfd, 0, BFD_RELOC_HI16_S, 2); quick_reloc (abfd, 0, BFD_RELOC_LO16, 0); /* MIPS_R_PAIR */ quick_reloc (abfd, 4, BFD_RELOC_LO16, 2); break; case PE_ARCH_arm: case PE_ARCH_arm_epoc: case PE_ARCH_arm_wince: quick_reloc (abfd, 8, BFD_RELOC_32, 2); break; default: abort (); } save_relocs (tx); } else bfd_set_section_size (abfd, tx, 0); bfd_set_section_size (abfd, id7, 4); d7 = xmalloc (4); id7->contents = d7; memset (d7, 0, 4); quick_reloc (abfd, 0, BFD_RELOC_RVA, 5); save_relocs (id7); bfd_set_section_size (abfd, id5, PE_IDATA5_SIZE); d5 = xmalloc (PE_IDATA5_SIZE); id5->contents = d5; memset (d5, 0, PE_IDATA5_SIZE); if (exp->flag_noname) { d5[0] = exp->ordinal; d5[1] = exp->ordinal >> 8; d5[PE_IDATA5_SIZE - 1] = 0x80; } else { quick_reloc (abfd, 0, BFD_RELOC_RVA, 4); save_relocs (id5); } bfd_set_section_size (abfd, id4, PE_IDATA4_SIZE); d4 = xmalloc (PE_IDATA4_SIZE); id4->contents = d4; memset (d4, 0, PE_IDATA4_SIZE); if (exp->flag_noname) { d4[0] = exp->ordinal; d4[1] = exp->ordinal >> 8; d4[PE_IDATA4_SIZE - 1] = 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 { /* { short, asciz } */ if (exp->its_name) len = 2 + strlen (exp->its_name) + 1; else len = 2 + strlen (exp->name) + 1; if (len & 1) len++; bfd_set_section_size (abfd, id6, len); d6 = xmalloc (len); id6->contents = d6; memset (d6, 0, len); d6[0] = exp->hint & 0xff; d6[1] = exp->hint >> 8; if (exp->its_name) strcpy ((char*) d6 + 2, exp->its_name); else strcpy ((char *) d6 + 2, exp->name); } bfd_set_symtab (abfd, symtab, symptr); if (include_jmp_stub) 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, PE_IDATA5_SIZE); bfd_set_section_contents (abfd, id4, d4, 0, PE_IDATA4_SIZE); if (!exp->flag_noname) bfd_set_section_contents (abfd, id6, d6, 0, len); bfd_make_readable (abfd); return abfd; } static bfd * make_singleton_name_imp (const char *import, bfd *parent) { /* Name thunks go to idata$4. */ asection *id5; unsigned char *d5; char *oname; bfd *abfd; oname = xmalloc (20); sprintf (oname, "nmimp%06d.o", tmp_seq2); tmp_seq2++; 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 = xmalloc (3 * sizeof (asymbol *)); id5 = quick_section (abfd, ".idata$5", SEC_HAS_CONTENTS, 2); quick_symbol (abfd, "__imp_", import, "", id5, BSF_GLOBAL, 0); /* We need space for the real thunk and for the null terminator. */ bfd_set_section_size (abfd, id5, PE_IDATA5_SIZE * 2); d5 = xmalloc (PE_IDATA5_SIZE * 2); id5->contents = d5; memset (d5, 0, PE_IDATA5_SIZE * 2); quick_reloc (abfd, 0, BFD_RELOC_RVA, 2); save_relocs (id5); bfd_set_symtab (abfd, symtab, symptr); bfd_set_section_contents (abfd, id5, d5, 0, PE_IDATA4_SIZE * 2); bfd_make_readable (abfd); return abfd; } static bfd * make_singleton_name_thunk (const char *import, bfd *parent) { /* Name thunks go to idata$4. */ asection *id4; unsigned char *d4; char *oname; bfd *abfd; oname = xmalloc (20); sprintf (oname, "nmth%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 = xmalloc (3 * sizeof (asymbol *)); id4 = quick_section (abfd, ".idata$4", SEC_HAS_CONTENTS, 2); quick_symbol (abfd, "__nm_thnk_", import, "", id4, BSF_GLOBAL, 0); quick_symbol (abfd, "__nm_", import, "", UNDSEC, BSF_GLOBAL, 0); /* We need space for the real thunk and for the null terminator. */ bfd_set_section_size (abfd, id4, PE_IDATA4_SIZE * 2); d4 = xmalloc (PE_IDATA4_SIZE * 2); id4->contents = d4; memset (d4, 0, PE_IDATA4_SIZE * 2); quick_reloc (abfd, 0, BFD_RELOC_RVA, 2); save_relocs (id4); bfd_set_symtab (abfd, symtab, symptr); bfd_set_section_contents (abfd, id4, d4, 0, PE_IDATA4_SIZE * 2); bfd_make_readable (abfd); return abfd; } static char * make_import_fixup_mark (arelent *rel) { /* We convert reloc to symbol, for later reference. */ static int counter; static char *fixup_name = NULL; static size_t buffer_len = 0; struct bfd_symbol *sym = *rel->sym_ptr_ptr; bfd *abfd = bfd_asymbol_bfd (sym); struct bfd_link_hash_entry *bh; if (!fixup_name) { fixup_name = xmalloc (384); buffer_len = 384; } if (strlen (sym->name) + 25 > buffer_len) /* Assume 25 chars for "__fu" + counter + "_". If counter is bigger than 20 digits long, we've got worse problems than overflowing this buffer... */ { free (fixup_name); /* New buffer size is length of symbol, plus 25, but then rounded up to the nearest multiple of 128. */ buffer_len = ((strlen (sym->name) + 25) + 127) & ~127; fixup_name = xmalloc (buffer_len); } sprintf (fixup_name, "__fu%d_%s", counter++, sym->name); bh = NULL; bfd_coff_link_add_one_symbol (&link_info, abfd, fixup_name, BSF_GLOBAL, current_sec, /* sym->section, */ rel->address, NULL, TRUE, FALSE, &bh); return fixup_name; } /* .section .idata$2 .rva __nm_thnk_SYM (singleton thunk with name of func) .long 0 .long 0 .rva __my_dll_iname (name of dll) .rva __fuNN_SYM (pointer to reference (address) in text) */ static bfd * make_import_fixup_entry (const char *name, const char *fixup_name, const char *symname, bfd *parent) { asection *id2; unsigned char *d2; char *oname; bfd *abfd; oname = xmalloc (20); sprintf (oname, "fu%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 = xmalloc (6 * sizeof (asymbol *)); id2 = quick_section (abfd, ".idata$2", SEC_HAS_CONTENTS, 2); quick_symbol (abfd, "__nm_thnk_", name, "", UNDSEC, BSF_GLOBAL, 0); quick_symbol (abfd, U (""), symname, "_iname", UNDSEC, BSF_GLOBAL, 0); /* For relocator v2 we have to use the .idata$5 element and not fixup_name. */ if (link_info.pei386_runtime_pseudo_reloc == 2) quick_symbol (abfd, "__imp_", name, "", UNDSEC, BSF_GLOBAL, 0); else quick_symbol (abfd, "", fixup_name, "", UNDSEC, BSF_GLOBAL, 0); bfd_set_section_size (abfd, id2, 20); d2 = xmalloc (20); id2->contents = d2; memset (d2, 0, 20); quick_reloc (abfd, 0, BFD_RELOC_RVA, 1); quick_reloc (abfd, 12, BFD_RELOC_RVA, 2); quick_reloc (abfd, 16, BFD_RELOC_RVA, 3); save_relocs (id2); bfd_set_symtab (abfd, symtab, symptr); bfd_set_section_contents (abfd, id2, d2, 0, 20); bfd_make_readable (abfd); return abfd; } /* .section .rdata_runtime_pseudo_reloc .long addend .rva __fuNN_SYM (pointer to reference (address) in text) */ static bfd * make_runtime_pseudo_reloc (const char *name ATTRIBUTE_UNUSED, const char *fixup_name, bfd_vma addend ATTRIBUTE_UNUSED, bfd_vma bitsize, bfd *parent) { asection *rt_rel; unsigned char *rt_rel_d; char *oname; bfd *abfd; oname = xmalloc (20); sprintf (oname, "rtr%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; if (link_info.pei386_runtime_pseudo_reloc == 2) { symtab = xmalloc ((runtime_pseudp_reloc_v2_init ? 3 : 6) * sizeof (asymbol *)); } else { symtab = xmalloc (2 * sizeof (asymbol *)); } rt_rel = quick_section (abfd, ".rdata_runtime_pseudo_reloc", SEC_HAS_CONTENTS, 2); quick_symbol (abfd, "", fixup_name, "", UNDSEC, BSF_GLOBAL, 0); if (link_info.pei386_runtime_pseudo_reloc == 2) { size_t size = 12; if (! runtime_pseudp_reloc_v2_init) { size += 12; runtime_pseudp_reloc_v2_init = 1; } quick_symbol (abfd, "__imp_", name, "", UNDSEC, BSF_GLOBAL, 0); bfd_set_section_size (abfd, rt_rel, size); rt_rel_d = xmalloc (size); rt_rel->contents = rt_rel_d; memset (rt_rel_d, 0, size); quick_reloc (abfd, size - 8, BFD_RELOC_RVA, 1); quick_reloc (abfd, size - 12, BFD_RELOC_RVA, 2); bfd_put_32 (abfd, bitsize, rt_rel_d + (size - 4)); if (size != 12) bfd_put_32 (abfd, 1, rt_rel_d + 8); save_relocs (rt_rel); bfd_set_symtab (abfd, symtab, symptr); bfd_set_section_contents (abfd, rt_rel, rt_rel_d, 0, size); } else { bfd_set_section_size (abfd, rt_rel, 8); rt_rel_d = xmalloc (8); rt_rel->contents = rt_rel_d; memset (rt_rel_d, 0, 8); bfd_put_32 (abfd, addend, rt_rel_d); quick_reloc (abfd, 4, BFD_RELOC_RVA, 1); save_relocs (rt_rel); bfd_set_symtab (abfd, symtab, symptr); bfd_set_section_contents (abfd, rt_rel, rt_rel_d, 0, 8); } bfd_make_readable (abfd); return abfd; } /* .section .rdata .rva __pei386_runtime_relocator */ static bfd * pe_create_runtime_relocator_reference (bfd *parent) { asection *extern_rt_rel; unsigned char *extern_rt_rel_d; char *oname; bfd *abfd; oname = xmalloc (20); sprintf (oname, "ertr%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 = xmalloc (2 * sizeof (asymbol *)); extern_rt_rel = quick_section (abfd, ".rdata", SEC_HAS_CONTENTS, 2); quick_symbol (abfd, "", U ("_pei386_runtime_relocator"), "", UNDSEC, BSF_NO_FLAGS, 0); bfd_set_section_size (abfd, extern_rt_rel, PE_IDATA5_SIZE); extern_rt_rel_d = xmalloc (PE_IDATA5_SIZE); extern_rt_rel->contents = extern_rt_rel_d; quick_reloc (abfd, 0, BFD_RELOC_RVA, 1); save_relocs (extern_rt_rel); bfd_set_symtab (abfd, symtab, symptr); bfd_set_section_contents (abfd, extern_rt_rel, extern_rt_rel_d, 0, PE_IDATA5_SIZE); bfd_make_readable (abfd); return abfd; } void pe_create_import_fixup (arelent *rel, asection *s, bfd_vma addend) { char buf[300]; struct bfd_symbol *sym = *rel->sym_ptr_ptr; struct bfd_link_hash_entry *name_thunk_sym; struct bfd_link_hash_entry *name_imp_sym; const char *name = sym->name; char *fixup_name = make_import_fixup_mark (rel); bfd *b; int need_import_table = 1; sprintf (buf, "__imp_%s", name); name_imp_sym = bfd_link_hash_lookup (link_info.hash, buf, 0, 0, 1); sprintf (buf, "__nm_thnk_%s", name); name_thunk_sym = bfd_link_hash_lookup (link_info.hash, buf, 0, 0, 1); /* For version 2 pseudo relocation we don't need to add an import if the import symbol is already present. */ if (link_info.pei386_runtime_pseudo_reloc == 2 && name_imp_sym && name_imp_sym->type == bfd_link_hash_defined) need_import_table = 0; if (need_import_table == 1 && (!name_thunk_sym || name_thunk_sym->type != bfd_link_hash_defined)) { b = make_singleton_name_thunk (name, link_info.output_bfd); add_bfd_to_link (b, b->filename, &link_info); /* If we ever use autoimport, we have to cast text section writable. But not for version 2. */ if (link_info.pei386_runtime_pseudo_reloc != 2) { config.text_read_only = FALSE; link_info.output_bfd->flags &= ~WP_TEXT; } if (link_info.pei386_runtime_pseudo_reloc == 2) { b = make_singleton_name_imp (name, link_info.output_bfd); add_bfd_to_link (b, b->filename, &link_info); } } if ((addend == 0 || link_info.pei386_runtime_pseudo_reloc) && need_import_table == 1) { extern char * pe_data_import_dll; char * symname = pe_data_import_dll ? pe_data_import_dll : "unknown"; b = make_import_fixup_entry (name, fixup_name, symname, link_info.output_bfd); add_bfd_to_link (b, b->filename, &link_info); } if ((link_info.pei386_runtime_pseudo_reloc != 0 && addend != 0) || link_info.pei386_runtime_pseudo_reloc == 2) { if (pe_dll_extra_pe_debug) printf ("creating runtime pseudo-reloc entry for %s (addend=%d)\n", fixup_name, (int) addend); b = make_runtime_pseudo_reloc (name, fixup_name, addend, rel->howto->bitsize, link_info.output_bfd); add_bfd_to_link (b, b->filename, &link_info); if (runtime_pseudo_relocs_created == 0) { b = pe_create_runtime_relocator_reference (link_info.output_bfd); add_bfd_to_link (b, b->filename, &link_info); } runtime_pseudo_relocs_created++; } else if (addend != 0) { einfo (_("%C: variable '%T' can't be auto-imported. Please read the documentation for ld's --enable-auto-import for details.\n"), s->owner, s, rel->address, sym->name); einfo ("%X"); } } void pe_dll_generate_implib (def_file *def, const char *impfilename, struct bfd_link_info *info) { int i; bfd *ar_head; bfd *ar_tail; bfd *outarch; bfd *ibfd; bfd *head = 0; dll_filename = (def->name) ? def->name : dll_name; dll_symname = xstrdup (dll_filename); for (i = 0; dll_symname[i]; i++) if (!ISALNUM (dll_symname[i])) dll_symname[i] = '_'; unlink_if_ordinary (impfilename); outarch = bfd_openw (impfilename, 0); if (!outarch) { /* xgettext:c-format */ einfo (_("%XCan't open .lib file: %s\n"), impfilename); return; } /* xgettext:c-format */ info_msg (_("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); /* Iterate the input BFDs, looking for exclude-modules-for-implib. */ for (ibfd = info->input_bfds; ibfd; ibfd = ibfd->link_next) { /* Iterate the exclude list. */ struct exclude_list_struct *ex; char found; for (ex = excludes, found = 0; ex && !found; ex = ex->next) { if (ex->type != EXCLUDEFORIMPLIB) continue; found = (filename_cmp (ex->string, ibfd->filename) == 0); } /* If it matched, we must open a fresh BFD for it (the original input BFD is still needed for the DLL's final link) and add it into the archive member chain. */ if (found) { bfd *newbfd = bfd_openr (ibfd->my_archive ? ibfd->my_archive->filename : ibfd->filename, NULL); if (!newbfd) { einfo (_("%Xbfd_openr %s: %E\n"), ibfd->filename); return; } if (ibfd->my_archive) { /* Must now iterate through archive until we find the required member. A minor shame that we'll open the archive once per member that we require from it, and leak those archive bfds rather than reuse them. */ bfd *arbfd = newbfd; if (!bfd_check_format_matches (arbfd, bfd_archive, NULL)) { einfo (_("%X%s(%s): can't find member in non-archive file"), ibfd->my_archive->filename, ibfd->filename); return; } newbfd = NULL; while ((newbfd = bfd_openr_next_archived_file (arbfd, newbfd)) != 0) { if (filename_cmp (newbfd->filename, ibfd->filename) == 0) break; } if (!newbfd) { einfo (_("%X%s(%s): can't find member in archive"), ibfd->my_archive->filename, ibfd->filename); return; } } newbfd->archive_next = head; head = newbfd; } } for (i = 0; i < def->num_exports; i++) { /* The import library doesn't know about the internal name. */ char *internal = def->exports[i].internal_name; bfd *n; /* Don't add PRIVATE entries to import lib. */ if (pe_def_file->exports[i].flag_private) continue; def->exports[i].internal_name = def->exports[i].name; n = make_one (def->exports + i, outarch, ! (def->exports + i)->flag_data); n->archive_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->archive_next = head; ar_tail->archive_next = ar_head; head = ar_tail; if (! bfd_set_archive_head (outarch, head)) einfo ("%Xbfd_set_archive_head: %E\n"); if (! bfd_close (outarch)) einfo ("%Xbfd_close %s: %E\n", impfilename); while (head != NULL) { bfd *n = head->archive_next; bfd_close (head); head = n; } } static struct bfd_link_hash_entry *found_sym; static bfd_boolean pe_undef_alias_cdecl_match (struct bfd_link_hash_entry *h, void *inf) { int sl; char *string = inf; const char *hs = h->root.string; sl = strlen (string); if (h->type == bfd_link_hash_undefined && ((*hs == '@' && (!pe_details->underscored || *string == '_') && strncmp (hs + 1, string + (pe_details->underscored != 0), sl - (pe_details->underscored != 0)) == 0) || strncmp (hs, string, sl) == 0) && h->root.string[sl] == '@') { found_sym = h; return FALSE; } return TRUE; } static struct bfd_link_hash_entry * pe_find_cdecl_alias_match (char *name) { found_sym = 0; bfd_link_hash_traverse (link_info.hash, pe_undef_alias_cdecl_match, (char *) name); return found_sym; } static void add_bfd_to_link (bfd *abfd, const char *name, struct bfd_link_info *linfo) { 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, linfo)) einfo ("%Xaddsym %s: %E\n", name); } void pe_process_import_defs (bfd *output_bfd, struct bfd_link_info *linfo) { int i, j; def_file_module *module; def_file_import *imp; pe_dll_id_target (bfd_get_target (output_bfd)); if (!pe_def_file) return; imp = pe_def_file->imports; for (module = pe_def_file->modules; module; module = module->next) { int do_this_dll = 0; for (i = 0; i < pe_def_file->num_imports && imp[i].module != module; i++) ; if (i >= pe_def_file->num_imports) continue; dll_filename = module->name; dll_symname = xstrdup (module->name); for (j = 0; dll_symname[j]; j++) if (!ISALNUM (dll_symname[j])) dll_symname[j] = '_'; for (; i < pe_def_file->num_imports && imp[i].module == module; i++) { def_file_export exp; struct bfd_link_hash_entry *blhe; int lead_at = (*imp[i].internal_name == '@'); /* See if we need this import. */ size_t len = strlen (imp[i].internal_name); char *name = xmalloc (len + 2 + 6); bfd_boolean include_jmp_stub = FALSE; bfd_boolean is_cdecl = FALSE; if (!lead_at && strchr (imp[i].internal_name, '@') == NULL) is_cdecl = TRUE; if (lead_at) sprintf (name, "%s", imp[i].internal_name); else sprintf (name, "%s%s",U (""), imp[i].internal_name); blhe = bfd_link_hash_lookup (linfo->hash, name, FALSE, FALSE, FALSE); /* Include the jump stub for <sym> only if the <sym> is undefined. */ if (!blhe || (blhe && blhe->type != bfd_link_hash_undefined)) { if (lead_at) sprintf (name, "%s%s", "__imp_", imp[i].internal_name); else sprintf (name, "%s%s%s", "__imp_", U (""), imp[i].internal_name); blhe = bfd_link_hash_lookup (linfo->hash, name, FALSE, FALSE, FALSE); } else include_jmp_stub = TRUE; if (is_cdecl && !blhe) { sprintf (name, "%s%s",U (""), imp[i].internal_name); blhe = pe_find_cdecl_alias_match (name); include_jmp_stub = TRUE; } 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, linfo); do_this_dll = 1; } exp.internal_name = imp[i].internal_name; exp.name = imp[i].name; exp.its_name = imp[i].its_name; exp.ordinal = imp[i].ordinal; exp.hint = exp.ordinal >= 0 ? exp.ordinal : 0; exp.flag_private = 0; exp.flag_constant = 0; exp.flag_data = imp[i].data; exp.flag_noname = exp.name ? 0 : 1; one = make_one (&exp, output_bfd, (! exp.flag_data) && include_jmp_stub); add_bfd_to_link (one, one->filename, linfo); } } if (do_this_dll) { bfd *ar_tail = make_tail (output_bfd); add_bfd_to_link (ar_tail, ar_tail->filename, linfo); } 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 (bfd *abfd, int where) { unsigned char b[2]; bfd_seek (abfd, (file_ptr) where, SEEK_SET); bfd_bread (b, (bfd_size_type) 2, abfd); return b[0] + (b[1] << 8); } static unsigned int pe_get32 (bfd *abfd, int where) { unsigned char b[4]; bfd_seek (abfd, (file_ptr) where, SEEK_SET); bfd_bread (b, (bfd_size_type) 4, abfd); return b[0] + (b[1] << 8) + (b[2] << 16) + (b[3] << 24); } static unsigned int pe_as32 (void *ptr) { unsigned char *b = ptr; return b[0] + (b[1] << 8) + (b[2] << 16) + (b[3] << 24); } bfd_boolean pe_implied_import_dll (const char *filename) { bfd *dll; bfd_vma pe_header_offset, opthdr_ofs, num_entries, i; bfd_vma export_rva, export_size, nsections, secptr, expptr; bfd_vma exp_funcbase; unsigned char *expdata; char *erva; bfd_vma name_rvas, nexp; const char *dllname; /* Initialization with start > end guarantees that is_data will not be set by mistake, and avoids compiler warning. */ bfd_vma data_start = 1; bfd_vma data_end = 0; bfd_vma rdata_start = 1; bfd_vma rdata_end = 0; bfd_vma bss_start = 1; bfd_vma bss_end = 0; /* 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: %E\n", filename); 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; } /* Get pe_header, optional header and numbers of directory entries. */ pe_header_offset = pe_get32 (dll, 0x3c); opthdr_ofs = pe_header_offset + 4 + 20; #ifdef pe_use_x86_64 num_entries = pe_get32 (dll, opthdr_ofs + 92 + 4 * 4); /* & NumberOfRvaAndSizes. */ #else num_entries = pe_get32 (dll, opthdr_ofs + 92); #endif /* No import or export directory entry. */ if (num_entries < 1) return FALSE; #ifdef pe_use_x86_64 export_rva = pe_get32 (dll, opthdr_ofs + 96 + 4 * 4); export_size = pe_get32 (dll, opthdr_ofs + 100 + 4 * 4); #else export_rva = pe_get32 (dll, opthdr_ofs + 96); export_size = pe_get32 (dll, opthdr_ofs + 100); #endif /* No export table - nothing to export. */ if (export_size == 0) return FALSE; 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; /* Get the rva and size of the export section. */ for (i = 0; i < nsections; i++) { char sname[8]; bfd_vma secptr1 = secptr + 40 * i; bfd_vma vaddr = pe_get32 (dll, secptr1 + 12); bfd_vma vsize = pe_get32 (dll, secptr1 + 16); bfd_vma fptr = pe_get32 (dll, secptr1 + 20); bfd_seek (dll, (file_ptr) secptr1, SEEK_SET); bfd_bread (sname, (bfd_size_type) 8, dll); if (vaddr <= export_rva && vaddr + vsize > export_rva) { expptr = fptr + (export_rva - vaddr); if (export_rva + export_size > vaddr + vsize) export_size = vsize - (export_rva - vaddr); break; } } /* Scan sections and store the base and size of the data and bss segments in data/base_start/end. */ for (i = 0; i < nsections; i++) { bfd_vma secptr1 = secptr + 40 * i; bfd_vma vsize = pe_get32 (dll, secptr1 + 8); bfd_vma vaddr = pe_get32 (dll, secptr1 + 12); bfd_vma flags = pe_get32 (dll, secptr1 + 36); char sec_name[9]; sec_name[8] = '\0'; bfd_seek (dll, (file_ptr) secptr1 + 0, SEEK_SET); bfd_bread (sec_name, (bfd_size_type) 8, dll); if (strcmp(sec_name,".data") == 0) { data_start = vaddr; data_end = vaddr + vsize; if (pe_dll_extra_pe_debug) printf ("%s %s: 0x%08lx-0x%08lx (0x%08lx)\n", __FUNCTION__, sec_name, (unsigned long) vaddr, (unsigned long) (vaddr + vsize), (unsigned long) flags); } else if (strcmp(sec_name,".rdata") == 0) { rdata_start = vaddr; rdata_end = vaddr + vsize; if (pe_dll_extra_pe_debug) printf ("%s %s: 0x%08lx-0x%08lx (0x%08lx)\n", __FUNCTION__, sec_name, (unsigned long) vaddr, (unsigned long) (vaddr + vsize), (unsigned long) flags); } else if (strcmp (sec_name,".bss") == 0) { bss_start = vaddr; bss_end = vaddr + vsize; if (pe_dll_extra_pe_debug) printf ("%s %s: 0x%08lx-0x%08lx (0x%08lx)\n", __FUNCTION__, sec_name, (unsigned long) vaddr, (unsigned long) (vaddr + vsize), (unsigned long) flags); } } expdata = xmalloc (export_size); bfd_seek (dll, (file_ptr) expptr, SEEK_SET); bfd_bread (expdata, (bfd_size_type) export_size, dll); erva = (char *) 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); exp_funcbase = pe_as32 (expdata + 28); /* Use internal dll name instead of filename to enable symbolic dll linking. */ dllname = erva + pe_as32 (expdata + 12); /* Check to see if the dll has already been added to the definition list and if so return without error. This avoids multiple symbol definitions. */ if (def_get_module (pe_def_file, dllname)) { if (pe_dll_extra_pe_debug) printf ("%s is already loaded\n", dllname); return TRUE; } /* Iterate through the list of symbols. */ for (i = 0; i < nexp; i++) { /* Pointer to the names vector. */ bfd_vma name_rva = pe_as32 (erva + name_rvas + i * 4); def_file_import *imp; /* Pointer to the function address vector. */ bfd_vma func_rva = pe_as32 (erva + exp_funcbase + i * 4); int is_data = 0; /* Skip unwanted symbols, which are exported in buggy auto-import releases. */ if (! CONST_STRNEQ (erva + name_rva, "__nm_")) { int is_dup = 0; /* is_data is true if the address is in the data, rdata or bss segment. */ is_data = (func_rva >= data_start && func_rva < data_end) || (func_rva >= rdata_start && func_rva < rdata_end) || (func_rva >= bss_start && func_rva < bss_end); imp = def_file_add_import (pe_def_file, erva + name_rva, dllname, i, NULL, NULL, &is_dup); /* Mark symbol type. */ if (!is_dup) imp->data = is_data; if (pe_dll_extra_pe_debug) printf ("%s dll-name: %s sym: %s addr: 0x%lx %s\n", __FUNCTION__, dllname, erva + name_rva, (unsigned long) func_rva, is_data ? "(data)" : ""); } } return TRUE; } void pe_output_file_set_long_section_names (bfd *abfd) { if (pe_use_coff_long_section_names < 0) return; if (!bfd_coff_set_long_section_names (abfd, pe_use_coff_long_section_names)) einfo (_("%XError: can't use long section names on this arch\n")); } /* These are the main functions, called from the emulation. The first is called after the bfds are read, so we can guess at how much space we need. The second is called after everything is placed, so we can put the right values in place. */ void pe_dll_build_sections (bfd *abfd, struct bfd_link_info *info) { pe_dll_id_target (bfd_get_target (abfd)); pe_output_file_set_long_section_names (abfd); process_def_file_and_drectve (abfd, info); if (pe_def_file->num_exports == 0 && !info->shared) return; generate_edata (abfd, info); build_filler_bfd (1); pe_output_file_set_long_section_names (filler_bfd); } void pe_exe_build_sections (bfd *abfd, struct bfd_link_info *info ATTRIBUTE_UNUSED) { pe_dll_id_target (bfd_get_target (abfd)); pe_output_file_set_long_section_names (abfd); build_filler_bfd (0); pe_output_file_set_long_section_names (filler_bfd); } void pe_dll_fill_sections (bfd *abfd, struct bfd_link_info *info) { pe_dll_id_target (bfd_get_target (abfd)); pe_output_file_set_long_section_names (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_reset_memory_regions (); lang_size_sections (NULL, TRUE); /* Redo special stuff. */ ldemul_after_allocation (); /* Do the assignments again. */ lang_do_assignments (lang_final_phase_enum); } fill_edata (abfd, info); if (info->shared && !info->pie) pe_data (abfd)->dll = 1; edata_s->contents = edata_d; reloc_s->contents = reloc_d; } void pe_exe_fill_sections (bfd *abfd, struct bfd_link_info *info) { pe_dll_id_target (bfd_get_target (abfd)); pe_output_file_set_long_section_names (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_reset_memory_regions (); lang_size_sections (NULL, TRUE); /* Redo special stuff. */ ldemul_after_allocation (); /* Do the assignments again. */ lang_do_assignments (lang_final_phase_enum); } reloc_s->contents = reloc_d; } bfd_boolean pe_bfd_is_dll (bfd *abfd) { return (bfd_get_format (abfd) == bfd_object && obj_pe (abfd) && pe_data (abfd)->dll); }
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