kdmove.c File Reference

#include "kdp.h"

Go to the source code of this file.

Functions
ULONG	KdpMoveMemory (IN PCHAR Destination, IN PCHAR Source, IN ULONG Length)
VOID	KdpQuickMoveMemory (IN PCHAR Destination, IN PCHAR Source, IN ULONG Length)

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Function Documentation

ULONG KdpMoveMemory (  IN PCHAR  Destination, IN PCHAR  Source, IN ULONG  Length )

Definition at line 31 of file 4/kdmove.c. References KDP_MESSAGE_BUFFER_SIZE, MmDbgReadCheck(), MmDbgReleaseAddress(), MmDbgWriteCheck(), and NULL. Referenced by KdLogDbgPrint(), KdpAddBreakpoint(), KdpGetCallNextOffset(), KdpGetReturnAddress(), KdpIsSpecialCall(), KdpIsTryFinallyReturn(), KdpLevelChange(), KdpLowRestoreBreakpoint(), KdpLowWriteContent(), KdpPrintString(), KdpPromptString(), KdpReadControlSpace(), KdpReadPhysicalMemory(), KdpReadVirtualMemory(), KdpReportLoadSymbolsStateChange(), KdpRestoreBreakPointEx(), KdpSetLoadState(), KdpSetStateChange(), KdpWriteBreakPointEx(), KdpWriteControlSpace(), KdpWritePhysicalMemory(), KdpWriteVirtualMemory(), and KdSetOwedBreakpoints(). 00039 : 00040 00041 This routine moves data to or from the message buffer and returns the 00042 actual length of the information that was moved. As data is moved, checks 00043 are made to ensure that the data is resident in memory and a page fault 00044 will not occur. If a page fault would occur, then the move is truncated. 00045 00046 Arguments: 00047 00048 Destination - Supplies a pointer to destination of the move operation. 00049 00050 Source - Supplies a pointer to the source of the move operation. 00051 00052 Length - Supplies the length of the move operation. 00053 00054 Return Value: 00055 00056 The actual length of the move is returned as the fucntion value. 00057 00058 --*/ 00059 00060 { 00061 00062 PVOID Address1; 00063 PVOID Address2; 00064 ULONG ActualLength; 00065 HARDWARE_PTE Opaque; 00066 00067 // 00068 // If the length is greater than the size of the message buffer, then 00069 // reduce the length to the size of the message buffer. 00070 // 00071 00072 if (Length > KDP_MESSAGE_BUFFER_SIZE) { 00073 Length = KDP_MESSAGE_BUFFER_SIZE; 00074 } 00075 00076 // 00077 // Move the source information to the destination address. 00078 // 00079 00080 ActualLength = Length; 00081 Address1 = NULL; 00082 00083 while (((ULONG_PTR)Source & 3) && (Length > 0)) { 00084 00085 // 00086 // Check to determine if the move will succeed before actually performing 00087 // the operation. 00088 // 00089 00090 Address1 = MmDbgWriteCheck((PVOID)Destination, &Opaque); 00091 Address2 = MmDbgReadCheck((PVOID)Source); 00092 if ((Address1 == NULL) || (Address2 == NULL)) { 00093 break; 00094 } 00095 *(PCHAR)Address1 = *(PCHAR)Address2; 00096 MmDbgReleaseAddress(Address1, &Opaque); 00097 Address1 = NULL; 00098 00099 Destination += 1; 00100 Source += 1; 00101 Length -= 1; 00102 } 00103 00104 if (Address1 != NULL) { 00105 MmDbgReleaseAddress(Address1, &Opaque); 00106 Address1 = NULL; 00107 } 00108 00109 while (Length > 3) { 00110 00111 // 00112 // Check to determine if the move will succeed before actually performing 00113 // the operation. 00114 // 00115 00116 Address1 = MmDbgWriteCheck((PVOID)Destination, &Opaque); 00117 Address2 = MmDbgReadCheck((PVOID)Source); 00118 if ((Address1 == NULL) || (Address2 == NULL)) { 00119 break; 00120 } 00121 *(ULONG UNALIGNED *)Address1 = *(PULONG)Address2; 00122 MmDbgReleaseAddress(Address1, &Opaque); 00123 Address1 = NULL; 00124 00125 Destination += 4; 00126 Source += 4; 00127 Length -= 4; 00128 00129 } 00130 00131 if (Address1 != NULL) { 00132 MmDbgReleaseAddress(Address1, &Opaque); 00133 Address1 = NULL; 00134 } 00135 00136 while (Length > 0) { 00137 00138 // 00139 // Check to determine if the move will succeed before actually performing 00140 // the operation. 00141 // 00142 00143 Address1 = MmDbgWriteCheck((PVOID)Destination, &Opaque); 00144 Address2 = MmDbgReadCheck((PVOID)Source); 00145 if ((Address1 == NULL) || (Address2 == NULL)) { 00146 break; 00147 } 00148 *(PCHAR)Address1 = *(PCHAR)Address2; 00149 MmDbgReleaseAddress(Address1, &Opaque); 00150 Address1 = NULL; 00151 00152 Destination += 1; 00153 Source += 1; 00154 Length -= 1; 00155 } 00156 00157 if (Address1 != NULL) { 00158 MmDbgReleaseAddress(Address1, &Opaque); 00159 Address1 = NULL; 00160 } 00161 00162 // 00163 // Flush the instruction cache in case the write was into the instruction 00164 // stream. 00165 // 00166 00167 KeSweepCurrentIcache(); 00168 return ActualLength - Length; 00169 }

VOID KdpQuickMoveMemory (  IN PCHAR  Destination, IN PCHAR  Source, IN ULONG  Length )

Definition at line 172 of file 4/kdmove.c. Referenced by KdpGetContext(), KdpSearchMemory(), KdpSetContext(), KdpSetStateChange(), and KdpTrap(). 00180 : 00181 00182 This routine does the exact same thing as RtlMoveMemory, BUT it is 00183 private to the debugger. This allows folks to set breakpoints and 00184 watch points in RtlMoveMemory without risk of recursive debugger 00185 entry and the accompanying hang. 00186 00187 N.B. UNLIKE KdpMoveMemory, this routine does NOT check for accessability 00188 and may fault! Use it ONLY in the debugger and ONLY where you 00189 could use RtlMoveMemory. 00190 00191 Arguments: 00192 00193 Destination - Supplies a pointer to destination of the move operation. 00194 00195 Source - Supplies a pointer to the source of the move operation. 00196 00197 Length - Supplies the length of the move operation. 00198 00199 Return Value: 00200 00201 None. 00202 00203 --*/ 00204 { 00205 while (Length > 0) { 00206 *Destination = *Source; 00207 Destination++; 00208 Source++; 00209 Length--; 00210 } 00211 } }

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