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wine/dlls/msvcrt/except_i386.c

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/*
* 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.
*/
#ifdef __i386__
#include <stdarg.h>
#include <fpieee.h>
#define longjmp ms_longjmp /* avoid prototype mismatch */
#include <setjmp.h>
#undef longjmp
#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;
/* exception frame for nested exceptions in catch block */
typedef struct
{
EXCEPTION_REGISTRATION_RECORD frame; /* standard exception frame */
cxx_exception_frame *cxx_frame; /* frame of parent exception */
const cxx_function_descr *descr; /* descriptor of parent exception */
int trylevel; /* current try level */
cxx_frame_info frame_info;
} catch_func_nested_frame;
typedef struct
{
cxx_exception_frame *frame;
const cxx_function_descr *descr;
catch_func_nested_frame *nested_frame;
} se_translator_ctx;
typedef struct _SCOPETABLE
{
int previousTryLevel;
int (*lpfnFilter)(PEXCEPTION_POINTERS);
void * (*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 */
typedef DWORD (CDECL *cxx_exc_custom_handler)( PEXCEPTION_RECORD, cxx_exception_frame*,
PCONTEXT, EXCEPTION_REGISTRATION_RECORD**,
const cxx_function_descr*, int nested_trylevel,
EXCEPTION_REGISTRATION_RECORD *nested_frame, DWORD unknown );
DWORD CDECL cxx_frame_handler( PEXCEPTION_RECORD rec, cxx_exception_frame* frame,
PCONTEXT context, EXCEPTION_REGISTRATION_RECORD** dispatch,
const cxx_function_descr *descr,
catch_func_nested_frame* nested_frame );
/* continue execution to the specified address after exception is caught */
extern void DECLSPEC_NORETURN continue_after_catch( cxx_exception_frame* frame, void *addr );
__ASM_GLOBAL_FUNC( continue_after_catch,
"movl 4(%esp), %edx\n\t"
"movl 8(%esp), %eax\n\t"
"movl -4(%edx), %esp\n\t"
"leal 12(%edx), %ebp\n\t"
"jmp *%eax" );
extern void DECLSPEC_NORETURN call_finally_block( void *code_block, void *base_ptr );
__ASM_GLOBAL_FUNC( call_finally_block,
"movl 8(%esp), %ebp\n\t"
"jmp *4(%esp)" );
extern int call_filter( int (*func)(PEXCEPTION_POINTERS), void *arg, void *ebp );
__ASM_GLOBAL_FUNC( call_filter,
"pushl %ebp\n\t"
"pushl 12(%esp)\n\t"
"movl 20(%esp), %ebp\n\t"
"call *12(%esp)\n\t"
"popl %ebp\n\t"
"popl %ebp\n\t"
"ret" );
extern void *call_handler( void * (*func)(void), void *ebp );
__ASM_GLOBAL_FUNC( call_handler,
"pushl %ebp\n\t"
"pushl %ebx\n\t"
"pushl %esi\n\t"
"pushl %edi\n\t"
"movl 24(%esp), %ebp\n\t"
"call *20(%esp)\n\t"
"popl %edi\n\t"
"popl %esi\n\t"
"popl %ebx\n\t"
"popl %ebp\n\t"
"ret" );
/* 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 );
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_handler( handler, &frame->ebp );
}
trylevel = descr->unwind_table[trylevel].prev;
}
frame->trylevel = last_level;
}
/* 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 )
{
catch_func_nested_frame *nested_frame = (catch_func_nested_frame *)frame;
if (rec->ExceptionFlags & (EXCEPTION_UNWINDING | EXCEPTION_EXIT_UNWIND))
{
__CxxUnregisterExceptionObject(&nested_frame->frame_info, FALSE);
return ExceptionContinueSearch;
}
TRACE( "got nested exception in catch function\n" );
if(rec->ExceptionCode == CXX_EXCEPTION)
{
PEXCEPTION_RECORD prev_rec = msvcrt_get_thread_data()->exc_record;
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 &= ~EXCEPTION_UNWINDING;
if(TRACE_ON(seh)) {
TRACE("detect rethrow: exception code: %lx\n", rec->ExceptionCode);
if(rec->ExceptionCode == CXX_EXCEPTION)
TRACE("re-propagate: obj: %Ix, type: %Ix\n",
rec->ExceptionInformation[1], rec->ExceptionInformation[2]);
}
}
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 );
}
/* 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, CONTEXT *context,
cxx_exception_frame *frame,
const cxx_function_descr *descr,
catch_func_nested_frame *catch_frame,
cxx_exception_type *info )
{
UINT i;
void *addr, *handler, *object = (void *)rec->ExceptionInformation[1];
catch_func_nested_frame nested_frame;
int trylevel = frame->trylevel;
DWORD save_esp = ((DWORD*)frame)[-1];
thread_data_t *data = msvcrt_get_thread_data();
data->processing_throw++;
for (i = 0; i < descr->tryblock_count; i++)
{
const tryblock_info *tryblock = &descr->tryblock[i];
/* only handle try blocks inside current catch block */
if (catch_frame && catch_frame->trylevel > tryblock->start_level) continue;
if (trylevel < tryblock->start_level) continue;
if (trylevel > tryblock->end_level) continue;
handler = find_catch_handler( object, (uintptr_t)&frame->ebp, 0, tryblock, info, 0 );
if (!handler) continue;
/* Add frame info here so exception is not freed inside RtlUnwind call */
_CreateFrameInfo(&nested_frame.frame_info.frame_info, object);
/* unwind the stack */
RtlUnwind( catch_frame ? &catch_frame->frame : &frame->frame, 0, rec, 0 );
cxx_local_unwind( frame, descr, tryblock->start_level );
frame->trylevel = tryblock->end_level + 1;
nested_frame.frame_info.rec = data->exc_record;
nested_frame.frame_info.context = data->ctx_record;
data->exc_record = rec;
data->ctx_record = context;
data->processing_throw--;
/* call the catch block */
TRACE( "calling handler %p ebp %p\n", handler, &frame->ebp );
/* setup an exception block for nested exceptions */
nested_frame.frame.Handler = catch_function_nested_handler;
nested_frame.cxx_frame = frame;
nested_frame.descr = descr;
nested_frame.trylevel = tryblock->end_level + 1;
__wine_push_frame( &nested_frame.frame );
addr = call_handler( handler, &frame->ebp );
__wine_pop_frame( &nested_frame.frame );
((DWORD*)frame)[-1] = save_esp;
__CxxUnregisterExceptionObject(&nested_frame.frame_info, FALSE);
TRACE( "done, continuing at %p\n", addr );
continue_after_catch( frame, addr );
}
data->processing_throw--;
}
static LONG CALLBACK se_translation_filter( EXCEPTION_POINTERS *ep, void *c )
{
se_translator_ctx *ctx = (se_translator_ctx *)c;
EXCEPTION_RECORD *rec = ep->ExceptionRecord;
cxx_exception_type *exc_type;
if (rec->ExceptionCode != CXX_EXCEPTION)
{
TRACE( "non-c++ exception thrown in SEH handler: %lx\n", rec->ExceptionCode );
terminate();
}
exc_type = (cxx_exception_type *)rec->ExceptionInformation[2];
call_catch_block( rec, ep->ContextRecord, ctx->frame, ctx->descr,
ctx->nested_frame, exc_type );
__DestructExceptionObject( rec );
return ExceptionContinueSearch;
}
static void check_noexcept( PEXCEPTION_RECORD rec,
const cxx_function_descr *descr, BOOL nested )
{
if (!nested && rec->ExceptionCode == CXX_EXCEPTION &&
descr->magic >= CXX_FRAME_MAGIC_VC8 &&
(descr->flags & FUNC_DESCR_NOEXCEPT))
{
ERR("noexcept function propagating exception\n");
terminate();
}
}
/*********************************************************************
* 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,
catch_func_nested_frame* nested_frame )
{
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 & (EXCEPTION_UNWINDING|EXCEPTION_EXIT_UNWIND))
{
if (descr->unwind_count && !nested_frame) cxx_local_unwind( frame, descr, -1 );
return ExceptionContinueSearch;
}
if (!descr->tryblock_count)
{
check_noexcept(rec, descr, nested_frame != NULL);
return ExceptionContinueSearch;
}
if(rec->ExceptionCode == CXX_EXCEPTION &&
rec->ExceptionInformation[1] == 0 && rec->ExceptionInformation[2] == 0)
{
*rec = *msvcrt_get_thread_data()->exc_record;
rec->ExceptionFlags &= ~EXCEPTION_UNWINDING;
if(TRACE_ON(seh)) {
TRACE("detect rethrow: exception code: %lx\n", rec->ExceptionCode);
if(rec->ExceptionCode == CXX_EXCEPTION)
TRACE("re-propagate: obj: %Ix, type: %Ix\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)
{
cxx_exc_custom_handler handler = exc_type->custom_handler;
return handler( rec, frame, context, dispatch, descr,
nested_frame ? nested_frame->trylevel : 0,
nested_frame ? &nested_frame->frame : NULL, 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 );
TRACE_EXCEPTION_TYPE( exc_type, 0 );
dump_function_descr( descr, 0 );
}
}
else
{
thread_data_t *data = msvcrt_get_thread_data();
exc_type = NULL;
TRACE("handling C exception code %lx 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;
se_translator_ctx ctx;
ctx.frame = frame;
ctx.descr = descr;
ctx.nested_frame = nested_frame;
__TRY
{
except_ptrs.ExceptionRecord = rec;
except_ptrs.ContextRecord = context;
data->se_translator( rec->ExceptionCode, &except_ptrs );
}
__EXCEPT_CTX(se_translation_filter, &ctx)
{
}
__ENDTRY
}
}
call_catch_block( rec, context, frame, descr,
nested_frame, exc_type );
check_noexcept(rec, descr, nested_frame != NULL);
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_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 24(%esp)\n\t" /* dispatch */
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"pushl 24(%esp)\n\t" /* context */
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"pushl 24(%esp)\n\t" /* frame */
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"pushl 24(%esp)\n\t" /* rec */
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"call " __ASM_NAME("cxx_frame_handler") "\n\t"
"add $24,%esp\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset -24\n\t")
"ret" )
/*********************************************************************
* __CxxLongjmpUnwind (MSVCRT.@)
*
* Callback meant to be used as UnwindFunc for setjmp/longjmp.
*/
void __stdcall __CxxLongjmpUnwind( const _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 );
}
/*********************************************************************
* _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 & (EXCEPTION_UNWINDING | EXCEPTION_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(&reg);
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_handler( frame->scopetable[level].lpfnHandler, ebp );
}
}
__wine_pop_frame(&reg);
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(&reg);
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_handler( scopetable->entries[level].lpfnHandler, ebp );
}
}
__wine_pop_frame(&reg);
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 %lx flags=%lx 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 %lx flags=%lx 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 & (EXCEPTION_UNWINDING | EXCEPTION_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);
}
}
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 %lx flags=%lx at %p handler=%p %p %p cookie=%lx scope table=%p cookies=%d/%lx,%d/%lx\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 & (EXCEPTION_UNWINDING | EXCEPTION_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)
{
__DestructExceptionObject(rec);
/* 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);
}
}
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 _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 )
/*******************************************************************
* _setjmp (MSVCRT.@)
*/
#undef _setjmp
DEFINE_SETJMP_ENTRYPOINT( _setjmp )
int CDECL __regs__setjmp(_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( _setjmp3 )
int WINAPIV __regs__setjmp3(_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 longjmp(_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;
__wine_longjmp( (__wine_jmp_buf *)jmp, retval );
}
/*********************************************************************
* _seh_longjmp_unwind (MSVCRT.@)
*/
void __stdcall _seh_longjmp_unwind(_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(_JUMP_BUFFER *jmp)
{
msvcrt_local_unwind4( (ULONG *)&jmp->Cookie, (MSVCRT_EXCEPTION_FRAME *)jmp->Registration,
jmp->TryLevel, (void *)jmp->Ebp );
}
/*********************************************************************
* handle_fpieee_flt
*/
int handle_fpieee_flt( __msvcrt_ulong exception_code, EXCEPTION_POINTERS *ep,
int (__cdecl *handler)(_FPIEEE_RECORD*) )
{
FLOATING_SAVE_AREA *ctx = &ep->ContextRecord->FloatSave;
_FPIEEE_RECORD rec;
int ret;
memset(&rec, 0, sizeof(rec));
rec.RoundingMode = ctx->ControlWord >> 10;
switch((ctx->ControlWord >> 8) & 0x3) {
case 0: rec.Precision = 2; break;
case 1: rec.Precision = 3; break;
case 2: rec.Precision = 1; break;
case 3: rec.Precision = 0; break;
}
rec.Status.InvalidOperation = ctx->StatusWord & 0x1;
rec.Status.ZeroDivide = ((ctx->StatusWord & 0x4) != 0);
rec.Status.Overflow = ((ctx->StatusWord & 0x8) != 0);
rec.Status.Underflow = ((ctx->StatusWord & 0x10) != 0);
rec.Status.Inexact = ((ctx->StatusWord & 0x20) != 0);
rec.Enable.InvalidOperation = ((ctx->ControlWord & 0x1) == 0);
rec.Enable.ZeroDivide = ((ctx->ControlWord & 0x4) == 0);
rec.Enable.Overflow = ((ctx->ControlWord & 0x8) == 0);
rec.Enable.Underflow = ((ctx->ControlWord & 0x10) == 0);
rec.Enable.Inexact = ((ctx->ControlWord & 0x20) == 0);
rec.Cause.InvalidOperation = rec.Enable.InvalidOperation & rec.Status.InvalidOperation;
rec.Cause.ZeroDivide = rec.Enable.ZeroDivide & rec.Status.ZeroDivide;
rec.Cause.Overflow = rec.Enable.Overflow & rec.Status.Overflow;
rec.Cause.Underflow = rec.Enable.Underflow & rec.Status.Underflow;
rec.Cause.Inexact = rec.Enable.Inexact & rec.Status.Inexact;
TRACE("code %lx handler %p opcode %lx\n", exception_code, handler,
*(ULONG*)ep->ContextRecord->FloatSave.ErrorOffset);
if(*(WORD*)ctx->ErrorOffset == 0x35dc) { /* fdiv m64fp */
if(exception_code==STATUS_FLOAT_DIVIDE_BY_ZERO || exception_code==STATUS_FLOAT_INVALID_OPERATION) {
rec.Operand1.OperandValid = 1;
rec.Result.OperandValid = 0;
} else {
rec.Operand1.OperandValid = 0;
rec.Result.OperandValid = 1;
}
rec.Operand2.OperandValid = 1;
rec.Operation = _FpCodeDivide;
rec.Operand1.Format = _FpFormatFp80;
memcpy(&rec.Operand1.Value.Fp80Value, ctx->RegisterArea, sizeof(rec.Operand1.Value.Fp80Value));
rec.Operand2.Format = _FpFormatFp64;
rec.Operand2.Value.Fp64Value = *(double*)ctx->DataOffset;
rec.Result.Format = _FpFormatFp80;
memcpy(&rec.Result.Value.Fp80Value, ctx->RegisterArea, sizeof(rec.Operand1.Value.Fp80Value));
ret = handler(&rec);
if(ret == EXCEPTION_CONTINUE_EXECUTION)
memcpy(ctx->RegisterArea, &rec.Result.Value.Fp80Value, sizeof(rec.Operand1.Value.Fp80Value));
return ret;
}
FIXME("unsupported opcode: %lx\n", *(ULONG*)ep->ContextRecord->FloatSave.ErrorOffset);
return EXCEPTION_CONTINUE_SEARCH;
}
#endif /* __i386__ */
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