/* * msvcrt C++ exception handling * * Copyright 2000 Jon Griffiths * Copyright 2002 Alexandre Julliard * Copyright 2005 Juan Lang * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA * * NOTES * A good reference is the article "How a C++ compiler implements * exception handling" by Vishal Kochhar, available on * www.thecodeproject.com. */ #include "config.h" #include "wine/port.h" #ifdef __i386__ #include <stdarg.h> #include "windef.h" #include "winbase.h" #include "winternl.h" #include "msvcrt.h" #include "wine/exception.h" #include "excpt.h" #include "wine/debug.h" #include "cppexcept.h" WINE_DEFAULT_DEBUG_CHANNEL(seh); /* the exception frame used by CxxFrameHandler */ typedef struct __cxx_exception_frame { EXCEPTION_REGISTRATION_RECORD frame; /* the standard exception frame */ int trylevel; DWORD ebp; } cxx_exception_frame; /* info about a single catch {} block */ typedef struct __catchblock_info { UINT flags; /* flags (see below) */ const type_info *type_info; /* C++ type caught by this block */ int offset; /* stack offset to copy exception object to */ void (*handler)(void);/* catch block handler code */ } catchblock_info; #define TYPE_FLAG_CONST 1 #define TYPE_FLAG_VOLATILE 2 #define TYPE_FLAG_REFERENCE 8 /* info about a single try {} block */ typedef struct __tryblock_info { int start_level; /* start trylevel of that block */ int end_level; /* end trylevel of that block */ int catch_level; /* initial trylevel of the catch block */ int catchblock_count; /* count of catch blocks in array */ const catchblock_info *catchblock; /* array of catch blocks */ } tryblock_info; /* info about the unwind handler for a given trylevel */ typedef struct __unwind_info { int prev; /* prev trylevel unwind handler, to run after this one */ void (*handler)(void);/* unwind handler */ } unwind_info; /* descriptor of all try blocks of a given function */ typedef struct __cxx_function_descr { UINT magic; /* must be CXX_FRAME_MAGIC */ UINT unwind_count; /* number of unwind handlers */ const unwind_info *unwind_table; /* array of unwind handlers */ UINT tryblock_count; /* number of try blocks */ const tryblock_info *tryblock; /* array of try blocks */ UINT ipmap_count; const void *ipmap; const void *expect_list; /* expected exceptions list when magic >= VC7 */ UINT flags; /* flags when magic >= VC8 */ } cxx_function_descr; #define FUNC_DESCR_SYNCHRONOUS 1 /* synchronous exceptions only (built with /EHs) */ typedef struct _SCOPETABLE { int previousTryLevel; int (*lpfnFilter)(PEXCEPTION_POINTERS); int (*lpfnHandler)(void); } SCOPETABLE, *PSCOPETABLE; typedef struct _MSVCRT_EXCEPTION_FRAME { EXCEPTION_REGISTRATION_RECORD *prev; void (*handler)(PEXCEPTION_RECORD, EXCEPTION_REGISTRATION_RECORD*, PCONTEXT, PEXCEPTION_RECORD); PSCOPETABLE scopetable; int trylevel; int _ebp; PEXCEPTION_POINTERS xpointers; } MSVCRT_EXCEPTION_FRAME; typedef struct { int gs_cookie_offset; ULONG gs_cookie_xor; int eh_cookie_offset; ULONG eh_cookie_xor; SCOPETABLE entries[1]; } SCOPETABLE_V4; #define TRYLEVEL_END (-1) /* End of trylevel list */ DWORD CDECL cxx_frame_handler( PEXCEPTION_RECORD rec, cxx_exception_frame* frame, PCONTEXT context, EXCEPTION_REGISTRATION_RECORD** dispatch, const cxx_function_descr *descr, EXCEPTION_REGISTRATION_RECORD* nested_frame, int nested_trylevel ); /* call a function with a given ebp */ static inline void *call_ebp_func( void *func, void *ebp ) { void *ret; int dummy; __asm__ __volatile__ ("pushl %%ebx\n\t" "pushl %%ebp\n\t" "movl %4,%%ebp\n\t" "call *%%eax\n\t" "popl %%ebp\n\t" "popl %%ebx" : "=a" (ret), "=S" (dummy), "=D" (dummy) : "0" (func), "1" (ebp) : "ecx", "edx", "memory" ); return ret; } /* call a copy constructor */ static inline void call_copy_ctor( void *func, void *this, void *src, int has_vbase ) { TRACE( "calling copy ctor %p object %p src %p\n", func, this, src ); if (has_vbase) /* in that case copy ctor takes an extra bool indicating whether to copy the base class */ __asm__ __volatile__("pushl $1; pushl %2; call *%0" : : "r" (func), "c" (this), "r" (src) : "eax", "edx", "memory" ); else __asm__ __volatile__("pushl %2; call *%0" : : "r" (func), "c" (this), "r" (src) : "eax", "edx", "memory" ); } /* call the destructor of the exception object */ static inline void call_dtor( void *func, void *object ) { __asm__ __volatile__("call *%0" : : "r" (func), "c" (object) : "eax", "edx", "memory" ); } /* continue execution to the specified address after exception is caught */ static inline void DECLSPEC_NORETURN continue_after_catch( cxx_exception_frame* frame, void *addr ) { __asm__ __volatile__("movl -4(%0),%%esp; leal 12(%0),%%ebp; jmp *%1" : : "r" (frame), "a" (addr) ); for (;;) ; /* unreached */ } static inline void call_finally_block( void *code_block, void *base_ptr ) { __asm__ __volatile__ ("movl %1,%%ebp; call *%%eax" : : "a" (code_block), "g" (base_ptr)); } static inline int call_filter( int (*func)(PEXCEPTION_POINTERS), void *arg, void *ebp ) { int ret; __asm__ __volatile__ ("pushl %%ebp; pushl %3; movl %2,%%ebp; call *%%eax; popl %%ebp; popl %%ebp" : "=a" (ret) : "0" (func), "r" (ebp), "r" (arg) : "ecx", "edx", "memory" ); return ret; } static inline int call_unwind_func( int (*func)(void), void *ebp ) { int ret; __asm__ __volatile__ ("pushl %%ebp\n\t" "pushl %%ebx\n\t" "pushl %%esi\n\t" "pushl %%edi\n\t" "movl %2,%%ebp\n\t" "call *%0\n\t" "popl %%edi\n\t" "popl %%esi\n\t" "popl %%ebx\n\t" "popl %%ebp" : "=a" (ret) : "0" (func), "r" (ebp) : "ecx", "edx", "memory" ); return ret; } static inline void dump_type( const cxx_type_info *type ) { TRACE( "flags %x type %p %s offsets %d,%d,%d size %d copy ctor %p\n", type->flags, type->type_info, dbgstr_type_info(type->type_info), type->offsets.this_offset, type->offsets.vbase_descr, type->offsets.vbase_offset, type->size, type->copy_ctor ); } static void dump_exception_type( const cxx_exception_type *type ) { UINT i; TRACE( "flags %x destr %p handler %p type info %p\n", type->flags, type->destructor, type->custom_handler, type->type_info_table ); for (i = 0; i < type->type_info_table->count; i++) { TRACE( " %d: ", i ); dump_type( type->type_info_table->info[i] ); } } static void dump_function_descr( const cxx_function_descr *descr ) { UINT i; int j; TRACE( "magic %x\n", descr->magic ); TRACE( "unwind table: %p %d\n", descr->unwind_table, descr->unwind_count ); for (i = 0; i < descr->unwind_count; i++) { TRACE( " %d: prev %d func %p\n", i, descr->unwind_table[i].prev, descr->unwind_table[i].handler ); } TRACE( "try table: %p %d\n", descr->tryblock, descr->tryblock_count ); for (i = 0; i < descr->tryblock_count; i++) { TRACE( " %d: start %d end %d catchlevel %d catch %p %d\n", i, descr->tryblock[i].start_level, descr->tryblock[i].end_level, descr->tryblock[i].catch_level, descr->tryblock[i].catchblock, descr->tryblock[i].catchblock_count ); for (j = 0; j < descr->tryblock[i].catchblock_count; j++) { const catchblock_info *ptr = &descr->tryblock[i].catchblock[j]; TRACE( " %d: flags %x offset %d handler %p type %p %s\n", j, ptr->flags, ptr->offset, ptr->handler, ptr->type_info, dbgstr_type_info( ptr->type_info ) ); } } if (descr->magic <= CXX_FRAME_MAGIC_VC6) return; TRACE( "expect list: %p\n", descr->expect_list ); if (descr->magic <= CXX_FRAME_MAGIC_VC7) return; TRACE( "flags: %08x\n", descr->flags ); } /* check if the exception type is caught by a given catch block, and return the type that matched */ static const cxx_type_info *find_caught_type( cxx_exception_type *exc_type, const catchblock_info *catchblock ) { UINT i; for (i = 0; i < exc_type->type_info_table->count; i++) { const cxx_type_info *type = exc_type->type_info_table->info[i]; if (!catchblock->type_info) return type; /* catch(...) matches any type */ if (catchblock->type_info != type->type_info) { if (strcmp( catchblock->type_info->mangled, type->type_info->mangled )) continue; } /* type is the same, now check the flags */ if ((exc_type->flags & TYPE_FLAG_CONST) && !(catchblock->flags & TYPE_FLAG_CONST)) continue; if ((exc_type->flags & TYPE_FLAG_VOLATILE) && !(catchblock->flags & TYPE_FLAG_VOLATILE)) continue; return type; /* it matched */ } return NULL; } /* copy the exception object where the catch block wants it */ static void copy_exception( void *object, cxx_exception_frame *frame, const catchblock_info *catchblock, const cxx_type_info *type ) { void **dest_ptr; if (!catchblock->type_info || !catchblock->type_info->mangled[0]) return; if (!catchblock->offset) return; dest_ptr = (void **)((char *)&frame->ebp + catchblock->offset); if (catchblock->flags & TYPE_FLAG_REFERENCE) { *dest_ptr = get_this_pointer( &type->offsets, object ); } else if (type->flags & CLASS_IS_SIMPLE_TYPE) { memmove( dest_ptr, object, type->size ); /* if it is a pointer, adjust it */ if (type->size == sizeof(void *)) *dest_ptr = get_this_pointer( &type->offsets, *dest_ptr ); } else /* copy the object */ { if (type->copy_ctor) call_copy_ctor( type->copy_ctor, dest_ptr, get_this_pointer(&type->offsets,object), (type->flags & CLASS_HAS_VIRTUAL_BASE_CLASS) ); else memmove( dest_ptr, get_this_pointer(&type->offsets,object), type->size ); } } /* unwind the local function up to a given trylevel */ static void cxx_local_unwind( cxx_exception_frame* frame, const cxx_function_descr *descr, int last_level) { void (*handler)(void); int trylevel = frame->trylevel; while (trylevel != last_level) { if (trylevel < 0 || trylevel >= descr->unwind_count) { ERR( "invalid trylevel %d\n", trylevel ); MSVCRT_terminate(); } handler = descr->unwind_table[trylevel].handler; if (handler) { TRACE( "calling unwind handler %p trylevel %d last %d ebp %p\n", handler, trylevel, last_level, &frame->ebp ); call_ebp_func( handler, &frame->ebp ); } trylevel = descr->unwind_table[trylevel].prev; } frame->trylevel = last_level; } /* exception frame for nested exceptions in catch block */ struct catch_func_nested_frame { EXCEPTION_REGISTRATION_RECORD frame; /* standard exception frame */ EXCEPTION_RECORD *prev_rec; /* previous record to restore in thread data */ cxx_exception_frame *cxx_frame; /* frame of parent exception */ const cxx_function_descr *descr; /* descriptor of parent exception */ int trylevel; /* current try level */ EXCEPTION_RECORD *rec; /* rec associated with frame */ }; /* handler for exceptions happening while calling a catch function */ static DWORD catch_function_nested_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame, CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher ) { struct catch_func_nested_frame *nested_frame = (struct catch_func_nested_frame *)frame; if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)) { msvcrt_get_thread_data()->exc_record = nested_frame->prev_rec; return ExceptionContinueSearch; } TRACE( "got nested exception in catch function\n" ); if(rec->ExceptionCode == CXX_EXCEPTION) { PEXCEPTION_RECORD prev_rec = nested_frame->rec; if((rec->ExceptionInformation[1] == 0 && rec->ExceptionInformation[2] == 0) || (prev_rec->ExceptionCode == CXX_EXCEPTION && rec->ExceptionInformation[1] == prev_rec->ExceptionInformation[1] && rec->ExceptionInformation[2] == prev_rec->ExceptionInformation[2])) { /* exception was rethrown */ *rec = *prev_rec; rec->ExceptionFlags &= ~EH_UNWINDING; if(TRACE_ON(seh)) { TRACE("detect rethrow: exception code: %x\n", rec->ExceptionCode); if(rec->ExceptionCode == CXX_EXCEPTION) TRACE("re-propage: obj: %lx, type: %lx\n", rec->ExceptionInformation[1], rec->ExceptionInformation[2]); } } else if (nested_frame->prev_rec && nested_frame->prev_rec->ExceptionCode == CXX_EXCEPTION && nested_frame->prev_rec->ExceptionInformation[1] == prev_rec->ExceptionInformation[1] && nested_frame->prev_rec->ExceptionInformation[2] == prev_rec->ExceptionInformation[2]) { TRACE("detect threw new exception in catch block - not owning old(obj: %lx type: %lx)\n", prev_rec->ExceptionInformation[1], prev_rec->ExceptionInformation[2]); } else if (prev_rec->ExceptionCode == CXX_EXCEPTION) { /* new exception in exception handler, destroy old */ void *object = (void*)prev_rec->ExceptionInformation[1]; cxx_exception_type *info = (cxx_exception_type*) prev_rec->ExceptionInformation[2]; TRACE("detect threw new exception in catch block - destroy old(obj: %p type: %p)\n", object, info); if(info && info->destructor) call_dtor( info->destructor, object ); } else { TRACE("detect threw new exception in catch block\n"); } } return cxx_frame_handler( rec, nested_frame->cxx_frame, context, NULL, nested_frame->descr, &nested_frame->frame, nested_frame->trylevel ); } /* find and call the appropriate catch block for an exception */ /* returns the address to continue execution to after the catch block was called */ static inline void call_catch_block( PEXCEPTION_RECORD rec, cxx_exception_frame *frame, const cxx_function_descr *descr, int nested_trylevel, cxx_exception_type *info ) { UINT i; int j; void *addr, *object = (void *)rec->ExceptionInformation[1]; struct catch_func_nested_frame nested_frame; int trylevel = frame->trylevel; thread_data_t *thread_data = msvcrt_get_thread_data(); DWORD save_esp = ((DWORD*)frame)[-1]; for (i = 0; i < descr->tryblock_count; i++) { const tryblock_info *tryblock = &descr->tryblock[i]; if (trylevel < tryblock->start_level) continue; if (trylevel > tryblock->end_level) continue; /* got a try block */ for (j = 0; j < tryblock->catchblock_count; j++) { const catchblock_info *catchblock = &tryblock->catchblock[j]; if(info) { const cxx_type_info *type = find_caught_type( info, catchblock ); if (!type) continue; TRACE( "matched type %p in tryblock %d catchblock %d\n", type, i, j ); /* copy the exception to its destination on the stack */ copy_exception( object, frame, catchblock, type ); } else { /* no CXX_EXCEPTION only proceed with a catch(...) block*/ if(catchblock->type_info) continue; TRACE("found catch(...) block\n"); } /* unwind the stack */ RtlUnwind( frame, 0, rec, 0 ); cxx_local_unwind( frame, descr, tryblock->start_level ); frame->trylevel = tryblock->end_level + 1; /* call the catch block */ TRACE( "calling catch block %p addr %p ebp %p\n", catchblock, catchblock->handler, &frame->ebp ); /* setup an exception block for nested exceptions */ nested_frame.frame.Handler = catch_function_nested_handler; nested_frame.prev_rec = thread_data->exc_record; nested_frame.cxx_frame = frame; nested_frame.descr = descr; nested_frame.trylevel = nested_trylevel + 1; nested_frame.rec = rec; __wine_push_frame( &nested_frame.frame ); thread_data->exc_record = rec; addr = call_ebp_func( catchblock->handler, &frame->ebp ); thread_data->exc_record = nested_frame.prev_rec; __wine_pop_frame( &nested_frame.frame ); ((DWORD*)frame)[-1] = save_esp; if (info && info->destructor) call_dtor( info->destructor, object ); TRACE( "done, continuing at %p\n", addr ); continue_after_catch( frame, addr ); } } } /********************************************************************* * cxx_frame_handler * * Implementation of __CxxFrameHandler. */ DWORD CDECL cxx_frame_handler( PEXCEPTION_RECORD rec, cxx_exception_frame* frame, PCONTEXT context, EXCEPTION_REGISTRATION_RECORD** dispatch, const cxx_function_descr *descr, EXCEPTION_REGISTRATION_RECORD* nested_frame, int nested_trylevel ) { cxx_exception_type *exc_type; if (descr->magic < CXX_FRAME_MAGIC_VC6 || descr->magic > CXX_FRAME_MAGIC_VC8) { ERR( "invalid frame magic %x\n", descr->magic ); return ExceptionContinueSearch; } if (descr->magic >= CXX_FRAME_MAGIC_VC8 && (descr->flags & FUNC_DESCR_SYNCHRONOUS) && (rec->ExceptionCode != CXX_EXCEPTION)) return ExceptionContinueSearch; /* handle only c++ exceptions */ if (rec->ExceptionFlags & (EH_UNWINDING|EH_EXIT_UNWIND)) { if (descr->unwind_count && !nested_trylevel) cxx_local_unwind( frame, descr, -1 ); return ExceptionContinueSearch; } if (!descr->tryblock_count) return ExceptionContinueSearch; if(rec->ExceptionCode == CXX_EXCEPTION && rec->ExceptionInformation[1] == 0 && rec->ExceptionInformation[2] == 0) { *rec = *msvcrt_get_thread_data()->exc_record; rec->ExceptionFlags &= ~EH_UNWINDING; if(TRACE_ON(seh)) { TRACE("detect rethrow: exception code: %x\n", rec->ExceptionCode); if(rec->ExceptionCode == CXX_EXCEPTION) TRACE("re-propage: obj: %lx, type: %lx\n", rec->ExceptionInformation[1], rec->ExceptionInformation[2]); } } if(rec->ExceptionCode == CXX_EXCEPTION) { exc_type = (cxx_exception_type *)rec->ExceptionInformation[2]; if (rec->ExceptionInformation[0] > CXX_FRAME_MAGIC_VC8 && exc_type->custom_handler) { return exc_type->custom_handler( rec, frame, context, dispatch, descr, nested_trylevel, nested_frame, 0 ); } if (TRACE_ON(seh)) { TRACE("handling C++ exception rec %p frame %p trylevel %d descr %p nested_frame %p\n", rec, frame, frame->trylevel, descr, nested_frame ); dump_exception_type( exc_type ); dump_function_descr( descr ); } } else { thread_data_t *data = msvcrt_get_thread_data(); exc_type = NULL; TRACE("handling C exception code %x rec %p frame %p trylevel %d descr %p nested_frame %p\n", rec->ExceptionCode, rec, frame, frame->trylevel, descr, nested_frame ); if (data->se_translator) { EXCEPTION_POINTERS except_ptrs; except_ptrs.ExceptionRecord = rec; except_ptrs.ContextRecord = context; data->se_translator(rec->ExceptionCode, &except_ptrs); } } call_catch_block( rec, frame, descr, frame->trylevel, exc_type ); return ExceptionContinueSearch; } /********************************************************************* * __CxxFrameHandler (MSVCRT.@) */ extern DWORD CDECL __CxxFrameHandler( PEXCEPTION_RECORD rec, EXCEPTION_REGISTRATION_RECORD* frame, PCONTEXT context, EXCEPTION_REGISTRATION_RECORD** dispatch ); __ASM_GLOBAL_FUNC( __CxxFrameHandler, "pushl $0\n\t" /* nested_trylevel */ __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t") "pushl $0\n\t" /* nested_frame */ __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t") "pushl %eax\n\t" /* descr */ __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t") "pushl 28(%esp)\n\t" /* dispatch */ __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t") "pushl 28(%esp)\n\t" /* context */ __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t") "pushl 28(%esp)\n\t" /* frame */ __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t") "pushl 28(%esp)\n\t" /* rec */ __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t") "call " __ASM_NAME("cxx_frame_handler") "\n\t" "add $28,%esp\n\t" __ASM_CFI(".cfi_adjust_cfa_offset -28\n\t") "ret" ) /********************************************************************* * __CxxLongjmpUnwind (MSVCRT.@) * * Callback meant to be used as UnwindFunc for setjmp/longjmp. */ void __stdcall __CxxLongjmpUnwind( const struct MSVCRT___JUMP_BUFFER *buf ) { cxx_exception_frame *frame = (cxx_exception_frame *)buf->Registration; const cxx_function_descr *descr = (const cxx_function_descr *)buf->UnwindData[0]; TRACE( "unwinding frame %p descr %p trylevel %ld\n", frame, descr, buf->TryLevel ); cxx_local_unwind( frame, descr, buf->TryLevel ); } /********************************************************************* * __CppXcptFilter (MSVCRT.@) */ int CDECL __CppXcptFilter(NTSTATUS ex, PEXCEPTION_POINTERS ptr) { /* only filter c++ exceptions */ if (ex != CXX_EXCEPTION) return EXCEPTION_CONTINUE_SEARCH; return _XcptFilter( ex, ptr ); } /********************************************************************* * __CxxDetectRethrow (MSVCRT.@) */ BOOL CDECL __CxxDetectRethrow(PEXCEPTION_POINTERS ptrs) { PEXCEPTION_RECORD rec; if (!ptrs) return FALSE; rec = ptrs->ExceptionRecord; if (rec->ExceptionCode == CXX_EXCEPTION && rec->NumberParameters == 3 && rec->ExceptionInformation[0] == CXX_FRAME_MAGIC_VC6 && rec->ExceptionInformation[2]) { ptrs->ExceptionRecord = msvcrt_get_thread_data()->exc_record; return TRUE; } return (msvcrt_get_thread_data()->exc_record == rec); } /********************************************************************* * __CxxQueryExceptionSize (MSVCRT.@) */ unsigned int CDECL __CxxQueryExceptionSize(void) { return sizeof(cxx_exception_type); } /********************************************************************* * _EH_prolog (MSVCRT.@) */ /* Provided for VC++ binary compatibility only */ __ASM_GLOBAL_FUNC(_EH_prolog, __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t") /* skip ret addr */ "pushl $-1\n\t" __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t") "pushl %eax\n\t" __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t") "pushl %fs:0\n\t" __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t") "movl %esp, %fs:0\n\t" "movl 12(%esp), %eax\n\t" "movl %ebp, 12(%esp)\n\t" "leal 12(%esp), %ebp\n\t" "pushl %eax\n\t" __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t") "ret") static const SCOPETABLE_V4 *get_scopetable_v4( MSVCRT_EXCEPTION_FRAME *frame, ULONG_PTR cookie ) { return (const SCOPETABLE_V4 *)((ULONG_PTR)frame->scopetable ^ cookie); } static DWORD MSVCRT_nested_handler(PEXCEPTION_RECORD rec, EXCEPTION_REGISTRATION_RECORD* frame, PCONTEXT context, EXCEPTION_REGISTRATION_RECORD** dispatch) { if (!(rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))) return ExceptionContinueSearch; *dispatch = frame; return ExceptionCollidedUnwind; } static void msvcrt_local_unwind2(MSVCRT_EXCEPTION_FRAME* frame, int trylevel, void *ebp) { EXCEPTION_REGISTRATION_RECORD reg; TRACE("(%p,%d,%d)\n",frame, frame->trylevel, trylevel); /* Register a handler in case of a nested exception */ reg.Handler = MSVCRT_nested_handler; reg.Prev = NtCurrentTeb()->Tib.ExceptionList; __wine_push_frame(®); while (frame->trylevel != TRYLEVEL_END && frame->trylevel != trylevel) { int level = frame->trylevel; frame->trylevel = frame->scopetable[level].previousTryLevel; if (!frame->scopetable[level].lpfnFilter) { TRACE( "__try block cleanup level %d handler %p ebp %p\n", level, frame->scopetable[level].lpfnHandler, ebp ); call_unwind_func( frame->scopetable[level].lpfnHandler, ebp ); } } __wine_pop_frame(®); TRACE("unwound OK\n"); } static void msvcrt_local_unwind4( ULONG *cookie, MSVCRT_EXCEPTION_FRAME* frame, int trylevel, void *ebp ) { EXCEPTION_REGISTRATION_RECORD reg; const SCOPETABLE_V4 *scopetable = get_scopetable_v4( frame, *cookie ); TRACE("(%p,%d,%d)\n",frame, frame->trylevel, trylevel); /* Register a handler in case of a nested exception */ reg.Handler = MSVCRT_nested_handler; reg.Prev = NtCurrentTeb()->Tib.ExceptionList; __wine_push_frame(®); while (frame->trylevel != -2 && frame->trylevel != trylevel) { int level = frame->trylevel; frame->trylevel = scopetable->entries[level].previousTryLevel; if (!scopetable->entries[level].lpfnFilter) { TRACE( "__try block cleanup level %d handler %p ebp %p\n", level, scopetable->entries[level].lpfnHandler, ebp ); call_unwind_func( scopetable->entries[level].lpfnHandler, ebp ); } } __wine_pop_frame(®); TRACE("unwound OK\n"); } /******************************************************************* * _local_unwind2 (MSVCRT.@) */ void CDECL _local_unwind2(MSVCRT_EXCEPTION_FRAME* frame, int trylevel) { msvcrt_local_unwind2( frame, trylevel, &frame->_ebp ); } /******************************************************************* * _local_unwind4 (MSVCRT.@) */ void CDECL _local_unwind4( ULONG *cookie, MSVCRT_EXCEPTION_FRAME* frame, int trylevel ) { msvcrt_local_unwind4( cookie, frame, trylevel, &frame->_ebp ); } /******************************************************************* * _global_unwind2 (MSVCRT.@) */ void CDECL _global_unwind2(EXCEPTION_REGISTRATION_RECORD* frame) { TRACE("(%p)\n",frame); RtlUnwind( frame, 0, 0, 0 ); } /********************************************************************* * _except_handler2 (MSVCRT.@) */ int CDECL _except_handler2(PEXCEPTION_RECORD rec, EXCEPTION_REGISTRATION_RECORD* frame, PCONTEXT context, EXCEPTION_REGISTRATION_RECORD** dispatcher) { FIXME("exception %x flags=%x at %p handler=%p %p %p stub\n", rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress, frame->Handler, context, dispatcher); return ExceptionContinueSearch; } /********************************************************************* * _except_handler3 (MSVCRT.@) */ int CDECL _except_handler3(PEXCEPTION_RECORD rec, MSVCRT_EXCEPTION_FRAME* frame, PCONTEXT context, void* dispatcher) { int retval, trylevel; EXCEPTION_POINTERS exceptPtrs; PSCOPETABLE pScopeTable; TRACE("exception %x flags=%x at %p handler=%p %p %p semi-stub\n", rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress, frame->handler, context, dispatcher); __asm__ __volatile__ ("cld"); if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)) { /* Unwinding the current frame */ msvcrt_local_unwind2(frame, TRYLEVEL_END, &frame->_ebp); TRACE("unwound current frame, returning ExceptionContinueSearch\n"); return ExceptionContinueSearch; } else { /* Hunting for handler */ exceptPtrs.ExceptionRecord = rec; exceptPtrs.ContextRecord = context; *((DWORD *)frame-1) = (DWORD)&exceptPtrs; trylevel = frame->trylevel; pScopeTable = frame->scopetable; while (trylevel != TRYLEVEL_END) { TRACE( "level %d prev %d filter %p\n", trylevel, pScopeTable[trylevel].previousTryLevel, pScopeTable[trylevel].lpfnFilter ); if (pScopeTable[trylevel].lpfnFilter) { retval = call_filter( pScopeTable[trylevel].lpfnFilter, &exceptPtrs, &frame->_ebp ); TRACE("filter returned %s\n", retval == EXCEPTION_CONTINUE_EXECUTION ? "CONTINUE_EXECUTION" : retval == EXCEPTION_EXECUTE_HANDLER ? "EXECUTE_HANDLER" : "CONTINUE_SEARCH"); if (retval == EXCEPTION_CONTINUE_EXECUTION) return ExceptionContinueExecution; if (retval == EXCEPTION_EXECUTE_HANDLER) { /* Unwind all higher frames, this one will handle the exception */ _global_unwind2((EXCEPTION_REGISTRATION_RECORD*)frame); msvcrt_local_unwind2(frame, trylevel, &frame->_ebp); /* Set our trylevel to the enclosing block, and call the __finally * code, which won't return */ frame->trylevel = pScopeTable[trylevel].previousTryLevel; TRACE("__finally block %p\n",pScopeTable[trylevel].lpfnHandler); call_finally_block(pScopeTable[trylevel].lpfnHandler, &frame->_ebp); ERR("Returned from __finally block - expect crash!\n"); } } trylevel = pScopeTable[trylevel].previousTryLevel; } } TRACE("reached TRYLEVEL_END, returning ExceptionContinueSearch\n"); return ExceptionContinueSearch; } /********************************************************************* * _except_handler4_common (MSVCRT.@) */ int CDECL _except_handler4_common( ULONG *cookie, void (*check_cookie)(void), EXCEPTION_RECORD *rec, MSVCRT_EXCEPTION_FRAME *frame, CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher ) { int retval, trylevel; EXCEPTION_POINTERS exceptPtrs; const SCOPETABLE_V4 *scope_table = get_scopetable_v4( frame, *cookie ); TRACE( "exception %x flags=%x at %p handler=%p %p %p cookie=%x scope table=%p cookies=%d/%x,%d/%x\n", rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress, frame->handler, context, dispatcher, *cookie, scope_table, scope_table->gs_cookie_offset, scope_table->gs_cookie_xor, scope_table->eh_cookie_offset, scope_table->eh_cookie_xor ); /* FIXME: no cookie validation yet */ if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)) { /* Unwinding the current frame */ msvcrt_local_unwind4( cookie, frame, -2, &frame->_ebp ); TRACE("unwound current frame, returning ExceptionContinueSearch\n"); return ExceptionContinueSearch; } else { /* Hunting for handler */ exceptPtrs.ExceptionRecord = rec; exceptPtrs.ContextRecord = context; *((DWORD *)frame-1) = (DWORD)&exceptPtrs; trylevel = frame->trylevel; while (trylevel != -2) { TRACE( "level %d prev %d filter %p\n", trylevel, scope_table->entries[trylevel].previousTryLevel, scope_table->entries[trylevel].lpfnFilter ); if (scope_table->entries[trylevel].lpfnFilter) { retval = call_filter( scope_table->entries[trylevel].lpfnFilter, &exceptPtrs, &frame->_ebp ); TRACE("filter returned %s\n", retval == EXCEPTION_CONTINUE_EXECUTION ? "CONTINUE_EXECUTION" : retval == EXCEPTION_EXECUTE_HANDLER ? "EXECUTE_HANDLER" : "CONTINUE_SEARCH"); if (retval == EXCEPTION_CONTINUE_EXECUTION) return ExceptionContinueExecution; if (retval == EXCEPTION_EXECUTE_HANDLER) { /* Unwind all higher frames, this one will handle the exception */ _global_unwind2((EXCEPTION_REGISTRATION_RECORD*)frame); msvcrt_local_unwind4( cookie, frame, trylevel, &frame->_ebp ); /* Set our trylevel to the enclosing block, and call the __finally * code, which won't return */ frame->trylevel = scope_table->entries[trylevel].previousTryLevel; TRACE("__finally block %p\n",scope_table->entries[trylevel].lpfnHandler); call_finally_block(scope_table->entries[trylevel].lpfnHandler, &frame->_ebp); ERR("Returned from __finally block - expect crash!\n"); } } trylevel = scope_table->entries[trylevel].previousTryLevel; } } TRACE("reached -2, returning ExceptionContinueSearch\n"); return ExceptionContinueSearch; } /* * setjmp/longjmp implementation */ #define MSVCRT_JMP_MAGIC 0x56433230 /* ID value for new jump structure */ typedef void (__stdcall *MSVCRT_unwind_function)(const struct MSVCRT___JUMP_BUFFER *); /* define an entrypoint for setjmp/setjmp3 that stores the registers in the jmp buf */ /* and then jumps to the C backend function */ #define DEFINE_SETJMP_ENTRYPOINT(name) \ __ASM_GLOBAL_FUNC( name, \ "movl 4(%esp),%ecx\n\t" /* jmp_buf */ \ "movl %ebp,0(%ecx)\n\t" /* jmp_buf.Ebp */ \ "movl %ebx,4(%ecx)\n\t" /* jmp_buf.Ebx */ \ "movl %edi,8(%ecx)\n\t" /* jmp_buf.Edi */ \ "movl %esi,12(%ecx)\n\t" /* jmp_buf.Esi */ \ "movl %esp,16(%ecx)\n\t" /* jmp_buf.Esp */ \ "movl 0(%esp),%eax\n\t" \ "movl %eax,20(%ecx)\n\t" /* jmp_buf.Eip */ \ "jmp " __ASM_NAME("__regs_") # name ) /* restore the registers from the jmp buf upon longjmp */ extern void DECLSPEC_NORETURN longjmp_set_regs( struct MSVCRT___JUMP_BUFFER *jmp, int retval ); __ASM_GLOBAL_FUNC( longjmp_set_regs, "movl 4(%esp),%ecx\n\t" /* jmp_buf */ "movl 8(%esp),%eax\n\t" /* retval */ "movl 0(%ecx),%ebp\n\t" /* jmp_buf.Ebp */ "movl 4(%ecx),%ebx\n\t" /* jmp_buf.Ebx */ "movl 8(%ecx),%edi\n\t" /* jmp_buf.Edi */ "movl 12(%ecx),%esi\n\t" /* jmp_buf.Esi */ "movl 16(%ecx),%esp\n\t" /* jmp_buf.Esp */ "addl $4,%esp\n\t" /* get rid of return address */ "jmp *20(%ecx)\n\t" /* jmp_buf.Eip */ ) /* * The signatures of the setjmp/longjmp functions do not match that * declared in the setjmp header so they don't follow the regular naming * convention to avoid conflicts. */ /******************************************************************* * _setjmp (MSVCRT.@) */ DEFINE_SETJMP_ENTRYPOINT(MSVCRT__setjmp) int CDECL __regs_MSVCRT__setjmp(struct MSVCRT___JUMP_BUFFER *jmp) { jmp->Registration = (unsigned long)NtCurrentTeb()->Tib.ExceptionList; if (jmp->Registration == ~0UL) jmp->TryLevel = TRYLEVEL_END; else jmp->TryLevel = ((MSVCRT_EXCEPTION_FRAME*)jmp->Registration)->trylevel; TRACE("buf=%p ebx=%08lx esi=%08lx edi=%08lx ebp=%08lx esp=%08lx eip=%08lx frame=%08lx\n", jmp, jmp->Ebx, jmp->Esi, jmp->Edi, jmp->Ebp, jmp->Esp, jmp->Eip, jmp->Registration ); return 0; } /******************************************************************* * _setjmp3 (MSVCRT.@) */ DEFINE_SETJMP_ENTRYPOINT( MSVCRT__setjmp3 ) int CDECL __regs_MSVCRT__setjmp3(struct MSVCRT___JUMP_BUFFER *jmp, int nb_args, ...) { jmp->Cookie = MSVCRT_JMP_MAGIC; jmp->UnwindFunc = 0; jmp->Registration = (unsigned long)NtCurrentTeb()->Tib.ExceptionList; if (jmp->Registration == ~0UL) { jmp->TryLevel = TRYLEVEL_END; } else { int i; va_list args; va_start( args, nb_args ); if (nb_args > 0) jmp->UnwindFunc = va_arg( args, unsigned long ); if (nb_args > 1) jmp->TryLevel = va_arg( args, unsigned long ); else jmp->TryLevel = ((MSVCRT_EXCEPTION_FRAME*)jmp->Registration)->trylevel; for (i = 0; i < 6 && i < nb_args - 2; i++) jmp->UnwindData[i] = va_arg( args, unsigned long ); va_end( args ); } TRACE("buf=%p ebx=%08lx esi=%08lx edi=%08lx ebp=%08lx esp=%08lx eip=%08lx frame=%08lx\n", jmp, jmp->Ebx, jmp->Esi, jmp->Edi, jmp->Ebp, jmp->Esp, jmp->Eip, jmp->Registration ); return 0; } /********************************************************************* * longjmp (MSVCRT.@) */ void CDECL MSVCRT_longjmp(struct MSVCRT___JUMP_BUFFER *jmp, int retval) { unsigned long cur_frame = 0; TRACE("buf=%p ebx=%08lx esi=%08lx edi=%08lx ebp=%08lx esp=%08lx eip=%08lx frame=%08lx retval=%08x\n", jmp, jmp->Ebx, jmp->Esi, jmp->Edi, jmp->Ebp, jmp->Esp, jmp->Eip, jmp->Registration, retval ); cur_frame=(unsigned long)NtCurrentTeb()->Tib.ExceptionList; TRACE("cur_frame=%lx\n",cur_frame); if (cur_frame != jmp->Registration) _global_unwind2((EXCEPTION_REGISTRATION_RECORD*)jmp->Registration); if (jmp->Registration) { if (IsBadReadPtr(&jmp->Cookie, sizeof(long)) || jmp->Cookie != MSVCRT_JMP_MAGIC) { msvcrt_local_unwind2((MSVCRT_EXCEPTION_FRAME*)jmp->Registration, jmp->TryLevel, (void *)jmp->Ebp); } else if(jmp->UnwindFunc) { MSVCRT_unwind_function unwind_func; unwind_func=(MSVCRT_unwind_function)jmp->UnwindFunc; unwind_func(jmp); } } if (!retval) retval = 1; longjmp_set_regs( jmp, retval ); } /********************************************************************* * _seh_longjmp_unwind (MSVCRT.@) */ void __stdcall _seh_longjmp_unwind(struct MSVCRT___JUMP_BUFFER *jmp) { msvcrt_local_unwind2( (MSVCRT_EXCEPTION_FRAME *)jmp->Registration, jmp->TryLevel, (void *)jmp->Ebp ); } /********************************************************************* * _seh_longjmp_unwind4 (MSVCRT.@) */ void __stdcall _seh_longjmp_unwind4(struct MSVCRT___JUMP_BUFFER *jmp) { msvcrt_local_unwind4( (void *)jmp->Cookie, (MSVCRT_EXCEPTION_FRAME *)jmp->Registration, jmp->TryLevel, (void *)jmp->Ebp ); } #endif /* __i386__ */