Alexandre Julliard : msvcrt: Added some assembly glue for the asm bits of __CxxFrameHandler
Module: wine Branch: refs/heads/master Commit: abb170fac3c80c384147138dfb55324ec3ed92a6 URL: http://source.winehq.org/git/?p=wine.git;a=commit;h=abb170fac3c80c384147138d... Author: Alexandre Julliard <julliard(a)winehq.org> Date: Thu Jan 5 13:56:11 2006 +0100 msvcrt: Added some assembly glue for the asm bits of __CxxFrameHandler to avoid having to save/restore the whole context on every call. --- dlls/msvcrt/cppexcept.c | 74 +++++++++++++++++++++++++---------------------- dlls/msvcrt/msvcrt.spec | 2 + 2 files changed, 41 insertions(+), 35 deletions(-) diff --git a/dlls/msvcrt/cppexcept.c b/dlls/msvcrt/cppexcept.c index 339bb7b..425a384 100644 --- a/dlls/msvcrt/cppexcept.c +++ b/dlls/msvcrt/cppexcept.c @@ -43,10 +43,10 @@ WINE_DEFAULT_DEBUG_CHANNEL(seh); #ifdef __i386__ /* CxxFrameHandler is not supported on non-i386 */ -static DWORD cxx_frame_handler( PEXCEPTION_RECORD rec, cxx_exception_frame* frame, - PCONTEXT exc_context, EXCEPTION_REGISTRATION_RECORD** dispatch, - cxx_function_descr *descr, EXCEPTION_REGISTRATION_RECORD* nested_frame, - int nested_trylevel, CONTEXT86 *context ); +DWORD cxx_frame_handler( PEXCEPTION_RECORD rec, cxx_exception_frame* frame, + PCONTEXT context, EXCEPTION_REGISTRATION_RECORD** dispatch, + cxx_function_descr *descr, EXCEPTION_REGISTRATION_RECORD* nested_frame, + int nested_trylevel ); /* call a function with a given ebp */ inline static void *call_ebp_func( void *func, void *ebp ) @@ -76,6 +76,14 @@ inline static void call_dtor( void *func __asm__ __volatile__("call *%0" : : "r" (func), "c" (object) : "eax", "edx", "memory" ); } +/* continue execution to the specified address after exception is caught */ +inline static 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 dump_type( const cxx_type_info *type ) { TRACE( "flags %x type %p %s offsets %d,%d,%d size %d copy ctor %p\n", @@ -232,19 +240,19 @@ static DWORD catch_function_nested_handl TRACE( "got nested exception in catch function\n" ); return cxx_frame_handler( rec, nested_frame->cxx_frame, context, NULL, nested_frame->descr, &nested_frame->frame, - nested_frame->trylevel, context ); + 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 */ -inline static void *call_catch_block( PEXCEPTION_RECORD rec, cxx_exception_frame *frame, - cxx_function_descr *descr, int nested_trylevel, - cxx_exception_type *info ) +inline static void call_catch_block( PEXCEPTION_RECORD rec, cxx_exception_frame *frame, + cxx_function_descr *descr, int nested_trylevel, + cxx_exception_type *info ) { UINT i; int j; - void *addr, *object = (void *)rec->ExceptionInformation[1]; + void *addr, *prev_frame, *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(); @@ -303,10 +311,11 @@ inline static void *call_catch_block( PE if (info && info->destructor) call_dtor( info->destructor, object ); TRACE( "done, continuing at %p\n", addr ); - return addr; + prev_frame = NtCurrentTeb()->Tib.ExceptionList; + __wine_pop_frame( prev_frame ); + continue_after_catch( frame, addr ); } } - return NULL; } @@ -315,13 +324,12 @@ inline static void *call_catch_block( PE * * Implementation of __CxxFrameHandler. */ -static DWORD cxx_frame_handler( PEXCEPTION_RECORD rec, cxx_exception_frame* frame, - PCONTEXT exc_context, EXCEPTION_REGISTRATION_RECORD** dispatch, - cxx_function_descr *descr, EXCEPTION_REGISTRATION_RECORD* nested_frame, - int nested_trylevel, CONTEXT86 *context ) +DWORD cxx_frame_handler( PEXCEPTION_RECORD rec, cxx_exception_frame* frame, + PCONTEXT context, EXCEPTION_REGISTRATION_RECORD** dispatch, + cxx_function_descr *descr, EXCEPTION_REGISTRATION_RECORD* nested_frame, + int nested_trylevel ) { cxx_exception_type *exc_type; - void *next_ip; if (descr->magic != CXX_FRAME_MAGIC) { @@ -342,7 +350,7 @@ static DWORD cxx_frame_handler( PEXCEPTI if (rec->ExceptionInformation[0] > CXX_FRAME_MAGIC && exc_type->custom_handler) { - return exc_type->custom_handler( rec, frame, exc_context, dispatch, + return exc_type->custom_handler( rec, frame, context, dispatch, descr, nested_trylevel, nested_frame, 0 ); } if (!exc_type) /* nested exception, fetch info from original exception */ @@ -365,29 +373,27 @@ static DWORD cxx_frame_handler( PEXCEPTI rec->ExceptionCode, rec, frame, frame->trylevel, descr, nested_frame ); } - next_ip = call_catch_block( rec, frame, descr, frame->trylevel, exc_type ); - - if (!next_ip) return ExceptionContinueSearch; - rec->ExceptionFlags &= ~EH_NONCONTINUABLE; - context->Eip = (DWORD)next_ip; - context->Ebp = (DWORD)&frame->ebp; - context->Esp = ((DWORD*)frame)[-1]; - return ExceptionContinueExecution; + call_catch_block( rec, frame, descr, frame->trylevel, exc_type ); + return ExceptionContinueSearch; } /********************************************************************* * __CxxFrameHandler (MSVCRT.@) */ -void WINAPI __regs___CxxFrameHandler( PEXCEPTION_RECORD rec, EXCEPTION_REGISTRATION_RECORD* frame, - PCONTEXT exc_context, EXCEPTION_REGISTRATION_RECORD** dispatch, - CONTEXT86 *context ) -{ - cxx_function_descr *descr = (cxx_function_descr *)context->Eax; - context->Eax = cxx_frame_handler( rec, (cxx_exception_frame *)frame, - exc_context, dispatch, descr, NULL, 0, context ); -} -DEFINE_REGS_ENTRYPOINT( __CxxFrameHandler, 16, 0 ); +extern DWORD __CxxFrameHandler( PEXCEPTION_RECORD rec, EXCEPTION_REGISTRATION_RECORD* frame, + PCONTEXT context, EXCEPTION_REGISTRATION_RECORD** dispatch ); +__ASM_GLOBAL_FUNC( __CxxFrameHandler, + "pushl $0\n\t" /* nested_trylevel */ + "pushl $0\n\t" /* nested_frame */ + "pushl %eax\n\t" /* descr */ + "pushl 28(%esp)\n\t" /* dispatch */ + "pushl 28(%esp)\n\t" /* context */ + "pushl 28(%esp)\n\t" /* frame */ + "pushl 28(%esp)\n\t" /* rec */ + "call " __ASM_NAME("cxx_frame_handler") "\n\t" + "add $28,%esp\n\t" + "ret" ); #endif /* __i386__ */ diff --git a/dlls/msvcrt/msvcrt.spec b/dlls/msvcrt/msvcrt.spec index a4d3ade..8e4a994 100644 --- a/dlls/msvcrt/msvcrt.spec +++ b/dlls/msvcrt/msvcrt.spec @@ -75,7 +75,7 @@ @ extern _HUGE MSVCRT__HUGE @ cdecl _Strftime(str long str ptr ptr) @ cdecl _XcptFilter(long ptr) -@ cdecl -i386 -register __CxxFrameHandler(ptr ptr ptr ptr) +@ cdecl -i386 -norelay __CxxFrameHandler(ptr ptr ptr ptr) @ stub __CxxLongjmpUnwind #(ptr) stdcall @ cdecl __RTCastToVoid(ptr) MSVCRT___RTCastToVoid @ cdecl __RTDynamicCast(ptr long ptr ptr long) MSVCRT___RTDynamicCast
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Alexandre Julliard