, " ", . , , ,
(stepping over) . , . , , (,
Debug Break WDBG).
> . , , , ( ), , . Intel Pentium INT ,
, , . CPU,
Intel Merced, , .
4-4 SetBreakpoint. , , DBG_*
LOCALASSIST.DLL , WDBG .
SetBreakpoint ( ), .
4-4. SetBreakepoint
1386CPUHELP.C
int CPUHELP_DLLINTERFACE _stdcall
SetBreakpoint ( PDEBUGPACKET dp ,
ULONG ulAddr ,
OPCODE * pOpCode )
{
DWORD dwReadWrite = 0;
BYTE bTempOp = BREAK_OPCODE;
BOOL bReadMem;
BOOL bWriteMem;
BOOL bFlush;
MEMORY_BASIC_INFORMATION mbi;
DWORD dwOldProtect;
ASSERT ( FALSE == IsBadReadPtr ( dp, sizeof ( DEBUGPACKET))) ;
ASSERT ( FALSE == IsBadWritePtr ( pOpCode, sizeof (
OPCODE)));
if ( ( TRUE == IsBadReadPtr ( dp, sizeof ( DEBUGPACKET)))
||
( TRUE == IsBadWritePtr ( pOpCode, sizeof ( OPCODE))) )
{
TRACE0 ( "SetBreakpoint : invalid parameters\n!");
return ( FALSE);
}
// Windows 98
// 2 , ,
if ( ( FALSE = IsNT ()) && ( ulAddr >= 0x80000000))
{
return ( FALSE);
}
// .
bReadMem = DBG_ReadProcessMemory ( dp->hProcess ,
(LPCVOID)ulAddr, SbTempOp , sizeof ( BYTE), SdwReadWrite ) ;
ASSERT ( FALSE != bReadMem);
ASSERT ( sizeof ( BYTE) =
dwReadWrite);
if ( ( FALSE = bReadMem ) ||
( sizeof ( BYTE) != dwReadWrite))
{
return ( FALSE);
}
//
// ?
if ( BREAKJDPCODE = bTempOp)
{
return ( -1);
}
// .
DBG_VirtualQueryEx ( dp->hProcess
,
(LPCVOID)ulAddr,
&mbi ,
sizeof ( MEMORY_BASIC_INFORMATION) );
//
// "- " ,
if ( FALSE == DBG_VirtualProtectEx ( dp->hProcess ,
mbi.BaseAddress ,
mbi.RegionSize ,
PAGE_EXECUTE_READWRITE,
&mbi.Protect ) )
{
ASSERT ( ! "VirtualProtectEx .failed!!");
return ( FALSE);
}
// .
*pOpCode = (void*)bTempOp;
bm = BREAK_DPCODE;
dwReadWrite = 0;
// ,
// .
bWriteMem = DBG_WriteProcessMemory ( dp->hProcess ,
(LPVOID)ulAddr ,
(LPVOID)SbTempOp,
sizeof ( BYTE) ,
sdwReadWrite );
ASSERT ( FALSE != bWriteMem);
ASSERT ( sizeof ( BYTE) == dwReadWrite);
if ( ( FALSE == bWriteMem ) ||
( sizeof ( BYTE) != dwReadWrite))
{
return ( FALSE);
}
// ,
//
// Change the protection back to what it was before
// I blasted thebreakpoint in.
VERIFY ( DBG_VirtualProtectEx ( dp->hProcess ,
mbi. BaseAddress,
mbi.RegionSize ,
mbi.Protect ,
SdwOldProtect ));
// , CPU
bFlush = DBG_FlushInstructionCache ( dp->hProcess ,
(LPCVOID)ulAddr,
sizeof ( BYTE) );
ASSERT ( TRUE = bFlush);
return ( TRUE);
}
CPU ,
EXCEPTION_BREAKPOINT (0x80000003) - . , . . , , . , , , , , , , . , , . .
: , ? CPU , . CPU
EXCEPTION_SINGLE_STEP (0x80000004). , CPU, 32- Windows, . Intel Pentium ( ) 8 . Intel
Trap Rag (TF ). 4-5
Setsingiestep , TF. , , CPU .
4-5. SetSingleStep
1386CPUHELP.C
BOOL CPUHELP_DLLIMNTERFACE _stdcall
SetSingleStep ( PDEBUGPACKET dp)
{
BOOL bSetContext;
ASSERT ( FALSE == IsBadReadPtr ( dp, sizeof ( DEBUGPACKET)));
if ( TRUE = IsBadReadPtr ( dp, sizeof ( DEBUGPACKET)))
{
TRACED ( "SetSingleStep : invalid parameters\n!");
return ( FALSE);
}
// i386, TF-.
dp->context.EFlags |= TF_BIT;
bSetContext = DBG_SetThreadContext ( dp->hThread,
&dp->context);
ASSERT ( FALSE != bSetContext);
return ( bSetContext);
}
,
ContinueDebugEvent, . , , . , "", . , . . ,
EXCEPTION_ SINGLE_STEP, TF, . , .
CWDBGProjDOC ::
.-andieBreakpoint,
WDBGPROJDOC.CPP -.
BREAKPOINTS BREAKPOINT.CPP.
, .
WDBG Breakpoints
, Visual C++. " " , .
CBreakpointsDig::OnOk BREAKPOINTSDLG.CPP
-.
, WDBG, Debug Break. , , .
, Debug Break, , WDBG. (one-shot)
, , . .
, CWDBGProj Doc: : OnDebugBreak
WDBGPROJDOC.CPP,
. 4-6
CWDBGProj Doc:: OnDebugBreak WDBGPROJDOC.CPP. "
Step Into, Step Over u Step Out" .
4-5. Debug
Breake WDBGPROJDOC.CPP
void CWDBGProjDoc :: OnDebugBreak ()
{
ASSERT ( m_vDbgThreads.size () > 0) ;
// ,
//
// . ,
// ,
// . ,
//
// , , "".
// , .
// ,
// :'
// 1. .
// 2. , ,
// Debug Break.
// 3. .
// 4. , .
// !
// 5. , "".
// 6.
//
// .
// 7. .
// 8. ,
//
// .
// ,
//
//
// .
HANDLE hThisThread = GetCurrentThread () ;
int iOldPriority = GetThreadPriority ( hThisThread);
SetThreadPriority ( hThisThread,
THREAD_BASE_PRIORITY_LOWRT);
HANDLE hProc = GetDebuggeeProcessHandle ();
DBGTHREADVECT::iterator i; for ( i = m_vDbgThreads.begin ();
i != m_vDbgThreads.end () ;
i++ )
{
// .
// , , , .
//
// .
// .
DBG_SuspendThread ( i->m_hThread);
// , .
CONTEXT ctx;
ctx.ContextFlags = CONTEXT_FULL;
// , ASSERT,
// ,
// "" , if-
// .
if ( FALSE != DBG_GetThreadContext ( i->m_hThread, &ctx))
{
// ,
// . ,
// .
DWORD dwAddr = ReturnlnstructionPointer ( &ctx);
COneShotBP cBP;
// .
cBP.SetBreakpointLocation ( dwAddr);
// .
if ( TRUE == cBP.ArmBreakpoint ( hProc))
{
// Debug Break,
//
// .
// ,
// ,
// . m_aDebugBreakBPs.Add ( cBP);
}
}
else
{
TRACE ( "GetThreadContext failed! Last Error = Ox%08X\n",
GetLastError ());
#ifdef _DEBUG
// GetThreadContext ,
// , , .
// , WDBG.
// , WDBG
// , DebugBreak
//
// , . DebugBreak ();
#endif
}
}
// .
// .
//
.
// ,
// . ,
// , .
// (ID) ,
// WM_NULL. ,
// , .
// ,
// , ,
for ( i = m_vDbgThreads.begin () ;
i!= m_vDbgThreads.end () ;
i++ )
{
//
//
. DBG_ResumeThread ( i->ro_hThread);
PostThreadMessage ( i->m_dwTID, WM_NULL, 0, 0);
}
// .
SetThreadPriority ( hThisThread, iOldPriority);
}
, "" CPU , . , API-
suspendThread, . , API-
GetThreadContext, . , . , API-
ResumeThread, , .
, . , . , . , , , , , . , ,_MOUSEMOVE, .
, , . , , , API, , (HWND)? , . , ,
PostThreadMessage, . HWND- ,
PostThreadMessage , .
, ? , - , , , . ,
WM_CREATE, , .
WM_NULL, , , .
WM_NULL PostThreadMessage , , . , , .
. , , , ? ,
, ,
, , , , , , - . .
, . , . , , . , , .
THREAD_BASE_PRIORITY_LOWRT, , , .
. ,
Debug Break , , . , , . , , , , . , ? , .
, , . ( Visual C+ 3 ), .
Debug Break , , . , , . WDBG ,
GWDBGProjDoc::OnDebugBreak ( WDBGPROJDOC.CPP -). , , . , ,
WDBG.
,
- ;
- , - ;
- , ;
- , , .
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