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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 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 "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" #include "pe-dll.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_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; /* 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; 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 (".text") }, /* 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 (".text") }, /* 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 static const 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, TRUE, 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 ("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 } }; 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_") }, { NULL, 0 } }; static const autofilter_entry_type autofilter_symbolsuffixlist[] = { { STRING_COMMA_LEN ("_iname") }, { 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) { 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 (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; 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 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; int type; } exclude_list_struct; static struct exclude_list_struct *excludes = 0; void pe_dll_add_excludes (const char *new_excludes, const int 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) { int i; struct exclude_list_struct *ex; const autofilter_entry_type *afptr; const char * libname = 0; if (abfd && abfd->my_archive) libname = lbasename (abfd->my_archive->filename); for (i = 0; i < d->num_exports; i++) if (strcmp (d->exports[i].name, n) == 0) 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 (strncmp (libname, afptr->name, afptr->len) == 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 == 1) /* exclude-libs */ { if (libname && ((strcmp (libname, ex->string) == 0) || (strcasecmp ("ALL", ex->string) == 0))) return 0; } else if (strcmp (n, ex->string) == 0) return 0; } return 1; } static void process_def_file (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; 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); } } /* If we are not building a DLL, when there are no exports we do not build an export table at all. */ if (!pe_dll_export_everything && pe_def_file->num_exports == 0 && info->executable) return; /* 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 = xmalloc (symsize); nsyms = bfd_canonicalize_symtab (b, symbols); 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. */ if (symbols[j]->section != &bfd_und_section && ((symbols[j]->flags & BSF_GLOBAL) || (symbols[j]->flags == BFD_FORT_COMM_DEFAULT_VALUE))) { 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)) { def_file_export *p; p=def_file_add_export (pe_def_file, sn, 0, -1); /* Fill data flag properly, from dlltool.c. */ p->flag_data = !(symbols[j]->flags & BSF_FUNCTION); } } } } } #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. */ 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; } } } 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 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); else free (tmp); } } } /* Convenience, but watch out for it changing. */ e = pe_def_file->exports; 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; 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) { 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; } else { if (i != j) e[j] = e[i]; j++; } } pe_def_file->num_exports = j; /* == NE */ for (i = 0; i < NE; i++) { char *name; /* Check for forward exports */ 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++; } continue; } 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++; } } 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; } 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(). */ 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 = edata_d + 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 { unsigned long 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; 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; int nsyms, symsize; symsize = bfd_get_symtab_upper_bound (b); symbols = xmalloc (symsize); nsyms = bfd_canonicalize_symtab (b, symbols); 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; unsigned long sec_page = (unsigned long) -1; unsigned long 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, 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 = xmalloc (symsize); nsyms = bfd_canonicalize_symtab (b, symbols); 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) { bfd_vma sym_vma; struct bfd_symbol *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; #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++) { 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; 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 = (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->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%lx", (unsigned long) 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); 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 (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, int 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); 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); bfd_set_section_size (abfd, id5, PE_IDATA5_SIZE); d5 = xmalloc (PE_IDATA5_SIZE); id5->contents = d5; memset (d5, 0, PE_IDATA5_SIZE); 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_symtab (abfd, symtab, symptr); bfd_set_section_contents (abfd, id2, d2, 0, 20); bfd_set_section_contents (abfd, id5, d5, 0, PE_IDATA5_SIZE); bfd_set_section_contents (abfd, id4, d4, 0, PE_IDATA4_SIZE); 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 (11 * 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); 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, U ("_nm_"), U (""), exp->internal_name, id6, BSF_GLOBAL,0); } if (pe_dll_compat_implib) quick_symbol (abfd, U ("__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 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 } */ 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; 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_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, U ("_nm_thnk_"), import, "", id4, BSF_GLOBAL, 0); quick_symbol (abfd, U ("_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 *dll_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, U ("_nm_thnk_"), name, "", UNDSEC, BSF_GLOBAL, 0); quick_symbol (abfd, U (""), dll_symname, "_iname", UNDSEC, BSF_GLOBAL, 0); 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, int addend, 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; 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); 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, 4); extern_rt_rel_d = xmalloc (4); 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, 4); bfd_make_readable (abfd); return abfd; } void pe_create_import_fixup (arelent *rel, asection *s, int addend) { char buf[300]; struct bfd_symbol *sym = *rel->sym_ptr_ptr; struct bfd_link_hash_entry *name_thunk_sym; const char *name = sym->name; char *fixup_name = make_import_fixup_mark (rel); bfd *b; sprintf (buf, U ("_nm_thnk_%s"), name); name_thunk_sym = bfd_link_hash_lookup (link_info.hash, buf, 0, 0, 1); if (!name_thunk_sym || name_thunk_sym->type != bfd_link_hash_defined) { bfd *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. */ config.text_read_only = FALSE; link_info.output_bfd->flags &= ~WP_TEXT; } if (addend == 0 || link_info.pei386_runtime_pseudo_reloc) { extern char * pe_data_import_dll; char * dll_symname = pe_data_import_dll ? pe_data_import_dll : "unknown"; b = make_import_fixup_entry (name, fixup_name, dll_symname, link_info.output_bfd); add_bfd_to_link (b, b->filename, &link_info); } if (addend != 0) { if (link_info.pei386_runtime_pseudo_reloc) { if (pe_dll_extra_pe_debug) printf ("creating runtime pseudo-reloc entry for %s (addend=%d)\n", fixup_name, addend); b = make_runtime_pseudo_reloc (name, fixup_name, addend, 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 { 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) { int i; bfd *ar_head; bfd *ar_tail; bfd *outarch; 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); 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 void add_bfd_to_link (bfd *abfd, const 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: %E\n", name); } void pe_process_import_defs (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; i < pe_def_file->num_imports; i++) if (pe_def_file->imports[i].module == module) { def_file_export exp; struct bfd_link_hash_entry *blhe; int lead_at = (*pe_def_file->imports[i].internal_name == '@'); /* See if we need this import. */ size_t len = strlen (pe_def_file->imports[i].internal_name); char *name = xmalloc (len + 2 + 6); bfd_boolean include_jmp_stub = FALSE; if (lead_at) sprintf (name, "%s", pe_def_file->imports[i].internal_name); else sprintf (name, "%s%s",U (""), pe_def_file->imports[i].internal_name); blhe = bfd_link_hash_lookup (link_info->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_", pe_def_file->imports[i].internal_name); else sprintf (name, "%s%s%s", "__imp_", U (""), pe_def_file->imports[i].internal_name); blhe = bfd_link_hash_lookup (link_info->hash, name, FALSE, FALSE, FALSE); } else 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, 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 = pe_def_file->imports[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, 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 (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; unsigned long pe_header_offset, opthdr_ofs, num_entries, i; unsigned long export_rva, export_size, nsections, secptr, expptr; unsigned long exp_funcbase; unsigned char *expdata; char *erva; unsigned long name_rvas, ordinals, nexp, ordbase; const char *dll_name; /* Initialization with start > end guarantees that is_data will not be set by mistake, and avoids compiler warning. */ unsigned long data_start = 1; unsigned long data_end = 0; unsigned long rdata_start = 1; unsigned long rdata_end = 0; unsigned long bss_start = 1; unsigned long 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 export 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 if (num_entries < 1) /* No exports. */ 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 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]; unsigned long secptr1 = secptr + 40 * i; unsigned long vaddr = pe_get32 (dll, secptr1 + 12); unsigned long vsize = pe_get32 (dll, secptr1 + 16); unsigned long 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++) { unsigned long secptr1 = secptr + 40 * i; unsigned long vsize = pe_get32 (dll, secptr1 + 8); unsigned long vaddr = pe_get32 (dll, secptr1 + 12); unsigned long 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, vaddr, vaddr + vsize, 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, vaddr, vaddr + vsize, 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, vaddr, vaddr + vsize, 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); ordinals = pe_as32 (expdata + 36); ordbase = pe_as32 (expdata + 16); exp_funcbase = pe_as32 (expdata + 28); /* Use internal dll name instead of filename to enable symbolic dll linking. */ dll_name = 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, dll_name)) { if (pe_dll_extra_pe_debug) printf ("%s is already loaded\n", dll_name); return TRUE; } /* Iterate through the list of symbols. */ for (i = 0; i < nexp; i++) { /* Pointer to the names vector. */ unsigned long name_rva = pe_as32 (erva + name_rvas + i * 4); def_file_import *imp; /* Pointer to the function address vector. */ unsigned long 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_")) { /* 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, dll_name, i, 0); /* Mark symbol type. */ imp->data = is_data; if (pe_dll_extra_pe_debug) printf ("%s dll-name: %s sym: %s addr: 0x%lx %s\n", __FUNCTION__, dll_name, erva + name_rva, func_rva, is_data ? "(data)" : ""); } } return TRUE; } /* 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)); process_def_file (abfd, info); if (pe_def_file->num_exports == 0 && !info->shared) return; generate_edata (abfd, info); build_filler_bfd (1); } void pe_exe_build_sections (bfd *abfd, struct bfd_link_info *info ATTRIBUTE_UNUSED) { pe_dll_id_target (bfd_get_target (abfd)); build_filler_bfd (0); } void pe_dll_fill_sections (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_reset_memory_regions (); lang_size_sections (NULL, TRUE); /* Redo special stuff. */ ldemul_after_allocation (); /* Do the assignments again. */ lang_do_assignments (); } 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)); 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 (); } 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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