191 lines
3.8 KiB
C
191 lines
3.8 KiB
C
/*++
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Copyright (c) 1996 Microsoft Corporation
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Module Name:
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move.c
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Abstract:
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This module contains code to implement the portable kernel debugger
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memory mover.
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Author:
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Mark Lucovsky (markl) 31-Aug-1990
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Revision History:
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--*/
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#include "bd.h"
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ULONG
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BdMoveMemory (
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IN PCHAR Destination,
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IN PCHAR Source,
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IN ULONG Length
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)
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/*++
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Routine Description:
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This routine moves data to or from the message buffer and returns the
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actual length of the information that was moved. As data is moved, checks
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are made to ensure that the data is resident in memory and a page fault
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will not occur. If a page fault would occur, then the move is truncated.
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Arguments:
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Destination - Supplies a pointer to destination of the move operation.
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Source - Supplies a pointer to the source of the move operation.
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Length - Supplies the length of the move operation.
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Return Value:
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The actual length of the move is returned as the fucntion value.
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--*/
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{
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PVOID Address1;
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PVOID Address2;
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ULONG ActualLength;
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//
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// If the length is greater than the size of the message buffer, then
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// reduce the length to the size of the message buffer.
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//
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if (Length > BD_MESSAGE_BUFFER_SIZE) {
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Length = BD_MESSAGE_BUFFER_SIZE;
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}
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//
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// Move the source information to the destination address.
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//
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ActualLength = Length;
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while (((ULONG_PTR)Source & 3) && (Length > 0)) {
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//
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// Check to determine if the move will succeed before actually performing
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// the operation.
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//
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Address1 = BdWriteCheck((PVOID)Destination);
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Address2 = BdReadCheck((PVOID)Source);
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if ((Address1 == NULL) || (Address2 == NULL)) {
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break;
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}
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*(PCHAR)Address1 = *(PCHAR)Address2;
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Destination += 1;
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Source += 1;
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Length -= 1;
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}
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while (Length > 3) {
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//
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// Check to determine if the move will succeed before actually performing
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// the operation.
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//
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Address1 = BdWriteCheck((PVOID)Destination);
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Address2 = BdReadCheck((PVOID)Source);
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if ((Address1 == NULL) || (Address2 == NULL)) {
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break;
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}
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*(ULONG UNALIGNED *)Address1 = *(PULONG)Address2;
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Destination += 4;
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Source += 4;
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Length -= 4;
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}
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while (Length > 0) {
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//
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// Check to determine if the move will succeed before actually performing
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// the operation.
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//
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Address1 = BdWriteCheck((PVOID)Destination);
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Address2 = BdReadCheck((PVOID)Source);
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if ((Address1 == NULL) || (Address2 == NULL)) {
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break;
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}
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*(PCHAR)Address1 = *(PCHAR)Address2;
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Destination += 1;
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Source += 1;
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Length -= 1;
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}
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//
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// Flush the instruction cache in case the write was into the instruction
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// stream.
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//
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#if defined(_ALPHA_)
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BdSweepIcache();
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#endif
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return ActualLength - Length;
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}
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VOID
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BdCopyMemory (
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IN PCHAR Destination,
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IN PCHAR Source,
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IN ULONG Length
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)
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/*++
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Routine Description:
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This routine duplicates the function pf RtlCopyMemory, but is private
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to the debugger. This allows breakpoints and watch points to be set
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RtlMoveMemory itself without risk of recursive debugger entry and the
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accompanying hang.
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N.B. Unlike BdMoveMemory, this routine does NOT check for accessability
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and may fault! Use it ONLY in the debugger and ONLY where you could
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use RtlMoveMemory.
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Arguments:
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Destination - Supplies a pointer to destination of the move operation.
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Source - Supplies a pointer to the source of the move operation.
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Length - Supplies the length of the move operation.
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Return Value:
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None.
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--*/
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{
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while (Length > 0) {
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*Destination = *Source;
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Destination += 1;
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Source += 1;
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Length -= 1;
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}
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return;
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}
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