160 lines
3.3 KiB
C
160 lines
3.3 KiB
C
|
/*++
|
||
|
|
|
||
|
|
Copyright (c) 1992 Microsoft Corporation
|
||
|
|
|
||
|
|
Module Name:
|
||
|
|
|
||
|
|
kdlock.c
|
||
|
|
|
||
|
|
Abstract:
|
||
|
|
|
||
|
|
This module contains code to synchronize the usage of the port
|
||
|
|
used by the kernel debugger.
|
||
|
|
|
||
|
|
Author:
|
||
|
|
|
||
|
|
Bryan M. Willman (bryanwi) 24-Sep-90
|
||
|
|
|
||
|
|
Revision History:
|
||
|
|
|
||
|
|
--*/
|
||
|
|
|
||
|
|
#include "kdp.h"
|
||
|
|
#include "dm.h"
|
||
|
|
|
||
|
|
BOOLEAN
|
||
|
|
KdPollBreakIn(
|
||
|
|
VOID
|
||
|
|
)
|
||
|
|
|
||
|
|
/*++
|
||
|
|
|
||
|
|
Routine Description:
|
||
|
|
|
||
|
|
This procedure raises IRQL to high_level, seizes the Debug port
|
||
|
|
spinlock, and checks to see if a breakin packet is pending.
|
||
|
|
If a packet is present, return TRUE, else FALSE.
|
||
|
|
|
||
|
|
A packet is present if:
|
||
|
|
|
||
|
|
There is a valid character which matches BREAK_CHAR.
|
||
|
|
|
||
|
|
N.B. Interrupts must be OFF around this call
|
||
|
|
|
||
|
|
Return Value:
|
||
|
|
|
||
|
|
TRUE if breakin sequence present, caller should execute int-3.
|
||
|
|
FALSE if no breakin seen.
|
||
|
|
|
||
|
|
--*/
|
||
|
|
|
||
|
|
{
|
||
|
|
BOOLEAN BreakIn;
|
||
|
|
BOOLEAN Enable;
|
||
|
|
UCHAR Input;
|
||
|
|
KIRQL OldIrql;
|
||
|
|
ULONG Status;
|
||
|
|
|
||
|
|
//
|
||
|
|
// If the debugger is enabled, see if a breakin by the kernel
|
||
|
|
// debugger is pending.
|
||
|
|
//
|
||
|
|
|
||
|
|
BreakIn = FALSE;
|
||
|
|
if (KdDebuggerEnabled != FALSE) {
|
||
|
|
Enable = KiDisableInterrupts();
|
||
|
|
#ifndef _X86_
|
||
|
|
KeRaiseIrql(HIGH_LEVEL, &OldIrql);
|
||
|
|
#endif
|
||
|
|
if (KdpControlCPending != FALSE) {
|
||
|
|
KdpControlCPressed = TRUE;
|
||
|
|
BreakIn = TRUE;
|
||
|
|
KdpControlCPending = FALSE;
|
||
|
|
|
||
|
|
} else {
|
||
|
|
KdpPortLock();
|
||
|
|
Status = KdPortPollByte(&Input);
|
||
|
|
if ((Status == CP_GET_SUCCESS) &&
|
||
|
|
(Input == BREAKIN_PACKET_BYTE)) {
|
||
|
|
BreakIn = TRUE;
|
||
|
|
KdpControlCPressed = TRUE;
|
||
|
|
}
|
||
|
|
KdpPortUnlock();
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifndef _X86_
|
||
|
|
KeLowerIrql(OldIrql);
|
||
|
|
#endif
|
||
|
|
KiRestoreInterrupts(Enable);
|
||
|
|
}
|
||
|
|
|
||
|
|
if(BreakIn)
|
||
|
|
/* We can probably assume that the debugger is reconnected */
|
||
|
|
KdDebuggerNotPresent = FALSE;
|
||
|
|
|
||
|
|
#ifdef DEVKIT
|
||
|
|
/* If we're going to break in, give the debug monitor a chance to do its
|
||
|
|
* own version of break in */
|
||
|
|
if(BreakIn && KeGetCurrentPrcb())
|
||
|
|
DmTell(DMTELL_ENTERDEBUGGER, NULL);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
return BreakIn;
|
||
|
|
}
|
||
|
|
|
||
|
|
BOOLEAN
|
||
|
|
KdpPollBreakInWithPortLock(
|
||
|
|
VOID
|
||
|
|
)
|
||
|
|
|
||
|
|
/*++
|
||
|
|
|
||
|
|
Routine Description:
|
||
|
|
|
||
|
|
This procedure same as KdPollBreakIn, but assumes the caller
|
||
|
|
already holds the port lock. Returns TRUE if a breakin packet
|
||
|
|
is pending.
|
||
|
|
|
||
|
|
A packet is present if:
|
||
|
|
|
||
|
|
There is a valid character which matches BREAK_CHAR.
|
||
|
|
|
||
|
|
N.B. Interrupts must be OFF around this call
|
||
|
|
|
||
|
|
Return Value:
|
||
|
|
|
||
|
|
TRUE if breakin sequence present, caller should execute int-3.
|
||
|
|
FALSE if no breakin seen.
|
||
|
|
|
||
|
|
--*/
|
||
|
|
|
||
|
|
{
|
||
|
|
|
||
|
|
BOOLEAN BreakIn;
|
||
|
|
BOOLEAN Enable;
|
||
|
|
UCHAR Input;
|
||
|
|
ULONG Status;
|
||
|
|
|
||
|
|
//
|
||
|
|
// If the debugger is enabled, see if a breakin by the kernel
|
||
|
|
// debugger is pending.
|
||
|
|
//
|
||
|
|
|
||
|
|
BreakIn = FALSE;
|
||
|
|
if (KdDebuggerEnabled != FALSE) {
|
||
|
|
if (KdpControlCPending != FALSE) {
|
||
|
|
BreakIn = TRUE;
|
||
|
|
KdpControlCPending = FALSE;
|
||
|
|
|
||
|
|
} else {
|
||
|
|
Status = KdPortPollByte(&Input);
|
||
|
|
if ((Status == CP_GET_SUCCESS) &&
|
||
|
|
(Input == BREAKIN_PACKET_BYTE)) {
|
||
|
|
BreakIn = TRUE;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return BreakIn;
|
||
|
|
}
|