392 lines
12 KiB
C
392 lines
12 KiB
C
/*
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* msvcrt.dll exception handling
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*
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* Copyright 2000 Jon Griffiths
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* NOTES:
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*
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* See http://www.microsoft.com/msj/0197/exception/exception.htm,
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* but don't believe all of it.
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*
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* FIXME: Incomplete support for nested exceptions/try block cleanup.
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*/
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#include "config.h"
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#include "ntddk.h"
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#include "wine/exception.h"
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#include "thread.h"
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#include "msvcrt.h"
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#include "msvcrt/setjmp.h"
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#include "msvcrt/excpt.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(msvcrt);
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typedef void (*MSVCRT_sig_handler_func)(void);
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/* VC++ extensions to Win32 SEH */
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typedef struct _SCOPETABLE
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{
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DWORD previousTryLevel;
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int (*lpfnFilter)(PEXCEPTION_POINTERS);
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int (*lpfnHandler)(void);
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} SCOPETABLE, *PSCOPETABLE;
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typedef struct _MSVCRT_EXCEPTION_FRAME
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{
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EXCEPTION_FRAME *prev;
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void (*handler)(PEXCEPTION_RECORD, PEXCEPTION_FRAME,
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PCONTEXT, PEXCEPTION_RECORD);
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PSCOPETABLE scopetable;
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DWORD trylevel;
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int _ebp;
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PEXCEPTION_POINTERS xpointers;
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} MSVCRT_EXCEPTION_FRAME;
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#define TRYLEVEL_END 0xffffffff /* End of trylevel list */
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#if defined(__GNUC__) && defined(__i386__)
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inline static void call_finally_block( void *code_block, void *base_ptr )
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{
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__asm__ __volatile__ ("movl %1,%%ebp; call *%%eax" \
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: : "a" (code_block), "g" (base_ptr));
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}
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static DWORD MSVCRT_nested_handler(PEXCEPTION_RECORD rec,
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struct __EXCEPTION_FRAME* frame,
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PCONTEXT context WINE_UNUSED,
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struct __EXCEPTION_FRAME** dispatch)
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{
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if (rec->ExceptionFlags & 0x6)
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return ExceptionContinueSearch;
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*dispatch = frame;
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return ExceptionCollidedUnwind;
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}
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#endif
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/*********************************************************************
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* _XcptFilter (MSVCRT.@)
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*/
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int _XcptFilter(int ex, PEXCEPTION_POINTERS ptr)
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{
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FIXME("(%d,%p)semi-stub\n", ex, ptr);
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return UnhandledExceptionFilter(ptr);
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}
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/*********************************************************************
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* _EH_prolog (MSVCRT.@)
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*/
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#ifdef __i386__
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/* Provided for VC++ binary compatability only */
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__ASM_GLOBAL_FUNC(_EH_prolog,
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"pushl $0xff\n\t"
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"pushl %eax\n\t"
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"pushl %fs:0\n\t"
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"movl %esp, %fs:0\n\t"
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"movl 12(%esp), %eax\n\t"
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"movl %ebp, 12(%esp)\n\t"
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"leal 12(%esp), %ebp\n\t"
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"pushl %eax\n\t"
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"ret");
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#endif
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/*******************************************************************
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* _global_unwind2 (MSVCRT.@)
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*/
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void _global_unwind2(PEXCEPTION_FRAME frame)
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{
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TRACE("(%p)\n",frame);
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RtlUnwind( frame, 0, 0, 0 );
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}
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/*******************************************************************
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* _local_unwind2 (MSVCRT.@)
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*/
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void _local_unwind2(MSVCRT_EXCEPTION_FRAME* frame,
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DWORD trylevel)
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{
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MSVCRT_EXCEPTION_FRAME *curframe = frame;
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DWORD curtrylevel = 0xfe;
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EXCEPTION_FRAME reg;
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TRACE("(%p,%ld,%ld)\n",frame, frame->trylevel, trylevel);
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/* Register a handler in case of a nested exception */
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reg.Handler = (PEXCEPTION_HANDLER)MSVCRT_nested_handler;
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reg.Prev = NtCurrentTeb()->except;
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__wine_push_frame(®);
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while (frame->trylevel != TRYLEVEL_END && frame->trylevel != trylevel)
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{
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curtrylevel = frame->scopetable[frame->trylevel].previousTryLevel;
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curframe = frame;
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curframe->trylevel = curtrylevel;
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if (!frame->scopetable[curtrylevel].lpfnFilter)
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{
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ERR("__try block cleanup not implemented - expect crash!\n");
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/* FIXME: Remove current frame, set ebp, call
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* frame->scopetable[curtrylevel].lpfnHandler()
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*/
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}
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}
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__wine_pop_frame(®);
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TRACE("unwound OK\n");
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}
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/*********************************************************************
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* _except_handler2 (MSVCRT.@)
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*/
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int _except_handler2(PEXCEPTION_RECORD rec,
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PEXCEPTION_FRAME frame,
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PCONTEXT context,
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PEXCEPTION_FRAME* dispatcher)
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{
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FIXME("exception %lx flags=%lx at %p handler=%p %p %p stub\n",
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rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
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frame->Handler, context, dispatcher);
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return ExceptionContinueSearch;
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}
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/*********************************************************************
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* _except_handler3 (MSVCRT.@)
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*/
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int _except_handler3(PEXCEPTION_RECORD rec,
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MSVCRT_EXCEPTION_FRAME* frame,
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PCONTEXT context, void* dispatcher)
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{
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#if defined(__GNUC__) && defined(__i386__)
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long retval, trylevel;
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EXCEPTION_POINTERS exceptPtrs;
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PSCOPETABLE pScopeTable;
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TRACE("exception %lx flags=%lx at %p handler=%p %p %p semi-stub\n",
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rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
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frame->handler, context, dispatcher);
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__asm__ __volatile__ ("cld");
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if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
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{
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/* Unwinding the current frame */
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_local_unwind2(frame, TRYLEVEL_END);
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return ExceptionContinueSearch;
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}
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else
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{
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/* Hunting for handler */
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exceptPtrs.ExceptionRecord = rec;
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exceptPtrs.ContextRecord = context;
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*((DWORD *)frame-1) = (DWORD)&exceptPtrs;
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trylevel = frame->trylevel;
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pScopeTable = frame->scopetable;
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while (trylevel != TRYLEVEL_END)
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{
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if (pScopeTable[trylevel].lpfnFilter)
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{
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TRACE("filter = %p\n", pScopeTable[trylevel].lpfnFilter);
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retval = pScopeTable[trylevel].lpfnFilter(&exceptPtrs);
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TRACE("filter returned %s\n", retval == EXCEPTION_CONTINUE_EXECUTION ?
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"CONTINUE_EXECUTION" : retval == EXCEPTION_EXECUTE_HANDLER ?
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"EXECUTE_HANDLER" : "CONTINUE_SEARCH");
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if (retval == EXCEPTION_CONTINUE_EXECUTION)
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return ExceptionContinueExecution;
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if (retval == EXCEPTION_EXECUTE_HANDLER)
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{
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/* Unwind all higher frames, this one will handle the exception */
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_global_unwind2((PEXCEPTION_FRAME)frame);
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_local_unwind2(frame, trylevel);
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/* Set our trylevel to the enclosing block, and call the __finally
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* code, which won't return
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*/
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frame->trylevel = pScopeTable->previousTryLevel;
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TRACE("__finally block %p\n",pScopeTable[trylevel].lpfnHandler);
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call_finally_block(pScopeTable[trylevel].lpfnHandler, &frame->_ebp);
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ERR("Returned from __finally block - expect crash!\n");
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}
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}
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trylevel = pScopeTable->previousTryLevel;
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}
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}
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#else
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TRACE("exception %lx flags=%lx at %p handler=%p %p %p stub\n",
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rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
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frame->handler, context, dispatcher);
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#endif
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return ExceptionContinueSearch;
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}
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/*********************************************************************
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* _abnormal_termination (MSVCRT.@)
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*/
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int _abnormal_termination(void)
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{
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FIXME("(void)stub\n");
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return 0;
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}
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/*
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* setjmp/longjmp implementation
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*/
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#ifdef __i386__
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#define MSVCRT_JMP_MAGIC 0x56433230 /* ID value for new jump structure */
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typedef void (*MSVCRT_unwind_function)(const void*);
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/*
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* The signatures of the setjmp/longjmp functions do not match that
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* declared in the setjmp header so they don't follow the regular naming
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* convention to avoid conflicts.
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*/
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/*******************************************************************
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* _setjmp (MSVCRT.@)
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*/
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void _MSVCRT__setjmp(_JUMP_BUFFER *jmp, CONTEXT86* context)
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{
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TRACE("(%p)\n",jmp);
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jmp->Ebp = context->Ebp;
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jmp->Ebx = context->Ebx;
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jmp->Edi = context->Edi;
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jmp->Esi = context->Esi;
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jmp->Esp = context->Esp;
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jmp->Eip = context->Eip;
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jmp->Registration = (unsigned long)NtCurrentTeb()->except;
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if (jmp->Registration == TRYLEVEL_END)
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jmp->TryLevel = TRYLEVEL_END;
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else
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jmp->TryLevel = ((MSVCRT_EXCEPTION_FRAME*)jmp->Registration)->trylevel;
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TRACE("returning 0\n");
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context->Eax=0;
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}
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/*******************************************************************
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* _setjmp3 (MSVCRT.@)
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*/
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void _MSVCRT__setjmp3(_JUMP_BUFFER *jmp, int nb_args, CONTEXT86* context)
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{
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TRACE("(%p,%d)\n",jmp,nb_args);
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jmp->Ebp = context->Ebp;
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jmp->Ebx = context->Ebx;
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jmp->Edi = context->Edi;
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jmp->Esi = context->Esi;
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jmp->Esp = context->Esp;
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jmp->Eip = context->Eip;
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jmp->Cookie = MSVCRT_JMP_MAGIC;
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jmp->UnwindFunc = 0;
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jmp->Registration = (unsigned long)NtCurrentTeb()->except;
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if (jmp->Registration == TRYLEVEL_END)
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{
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jmp->TryLevel = TRYLEVEL_END;
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}
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else
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{
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void **args = ((void**)context->Esp)+2;
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if (nb_args > 0) jmp->UnwindFunc = (unsigned long)*args++;
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if (nb_args > 1) jmp->TryLevel = (unsigned long)*args++;
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else jmp->TryLevel = ((MSVCRT_EXCEPTION_FRAME*)jmp->Registration)->trylevel;
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if (nb_args > 2)
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{
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size_t size = (nb_args - 2) * sizeof(DWORD);
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memcpy( jmp->UnwindData, args, min( size, sizeof(jmp->UnwindData) ));
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}
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}
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TRACE("returning 0\n");
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context->Eax = 0;
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}
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/*********************************************************************
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* longjmp (MSVCRT.@)
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*/
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void _MSVCRT_longjmp(_JUMP_BUFFER *jmp, int retval, CONTEXT86* context)
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{
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unsigned long cur_frame = 0;
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TRACE("(%p,%d)\n", jmp, retval);
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cur_frame=(unsigned long)NtCurrentTeb()->except;
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TRACE("cur_frame=%lx\n",cur_frame);
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if (cur_frame != jmp->Registration)
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_global_unwind2((PEXCEPTION_FRAME)jmp->Registration);
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if (jmp->Registration)
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{
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if (!IsBadReadPtr(&jmp->Cookie, sizeof(long)) &&
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jmp->Cookie == MSVCRT_JMP_MAGIC && jmp->UnwindFunc)
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{
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MSVCRT_unwind_function unwind_func;
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unwind_func=(MSVCRT_unwind_function)jmp->UnwindFunc;
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unwind_func(jmp);
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}
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else
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_local_unwind2((MSVCRT_EXCEPTION_FRAME*)jmp->Registration,
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jmp->TryLevel);
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}
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if (!retval)
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retval = 1;
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TRACE("Jump to %lx returning %d\n",jmp->Eip,retval);
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context->Ebp = jmp->Ebp;
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context->Ebx = jmp->Ebx;
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context->Edi = jmp->Edi;
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context->Esi = jmp->Esi;
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context->Esp = jmp->Esp;
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context->Eip = jmp->Eip;
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context->Eax = retval;
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}
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#endif /* i386 */
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/*********************************************************************
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* signal (MSVCRT.@)
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*/
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void* MSVCRT_signal(int sig, MSVCRT_sig_handler_func func)
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{
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FIXME("(%d %p):stub\n", sig, func);
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return (void*)-1;
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}
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/*********************************************************************
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* __CxxFrameHandler (MSVCRT.@)
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*/
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DWORD __CxxFrameHandler(PEXCEPTION_RECORD rec, struct __EXCEPTION_FRAME* frame,
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PCONTEXT context, struct __EXCEPTION_FRAME** dispatch)
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{
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FIXME("(%p,%p,%p,%p):stub?\n",rec,frame,context,dispatch);
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/* Copied from MSVCRT_nested_handler, I hope this is more
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* or less the right thing to do
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*/
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if (rec->ExceptionFlags & 0x6)
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return ExceptionContinueSearch;
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*dispatch = frame;
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return ExceptionCollidedUnwind;
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}
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