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/*++
Copyright (c) 1992-1993 Microsoft Corporation
Module Name:
dbgctrl.c
Abstract:
This module implements the NtDebugControl service
Author:
Chuck Lenzmeier (chuckl) 2-Dec-1992
Environment:
Kernel mode only.
Revision History:
--*/
#include "exp.h"
#if defined(ALLOC_PRAGMA)
#pragma alloc_text(PAGE, NtSystemDebugControl)
#endif
#if i386
NTSTATUS
KdGetTraceInformation (
OUT PVOID TraceInformation,
IN ULONG TraceInformationLength,
OUT PULONG RequiredLength
);
VOID
KdSetInternalBreakpoint (
IN PDBGKD_MANIPULATE_STATE m
);
NTSTATUS
KdQuerySpecialCalls (
IN PDBGKD_MANIPULATE_STATE m,
IN ULONG Length,
OUT PULONG RequiredLength
);
VOID
KdSetSpecialCall (
IN PDBGKD_MANIPULATE_STATE m,
IN PCONTEXT ContextRecord
);
VOID
KdClearSpecialCalls (
VOID
);
#endif
NTSTATUS
NtSystemDebugControl (
IN SYSDBG_COMMAND Command,
IN PVOID InputBuffer,
IN ULONG InputBufferLength,
OUT PVOID OutputBuffer,
IN ULONG OutputBufferLength,
OUT PULONG ReturnLength OPTIONAL
)
/*++
Routine Description:
This function controls the system debugger.
Arguments:
Command - The command to be executed. One of the following:
SysDbgQueryTraceInformation
SysDbgSetTracepoint
SysDbgSetSpecialCall
SysDbgClearSpecialCalls
SysDbgQuerySpecialCalls
InputBuffer - A pointer to a buffer describing the input data for
the request, if any. The structure of this buffer varies
depending upon Command.
InputBufferLength - The length in bytes of InputBuffer.
OutputBuffer - A pointer to a buffer that is to receive the output
data for the request, if any. The structure of this buffer
varies depending upon Command.
OutputBufferLength - The length in bytes of OutputBuffer.
ReturnLength - A optional pointer to a ULONG that is to receive the
output data length for the request.
Return Value:
Returns one of the following status codes:
STATUS_SUCCESS - normal, successful completion.
STATUS_INVALID_INFO_CLASS - The Command parameter did not
specify a valid value.
STATUS_INFO_LENGTH_MISMATCH - The value of the Length field in the
Parameters buffer was not correct.
STATUS_ACCESS_VIOLATION - Either the Parameters buffer pointer
or a pointer within the Parameters buffer specified an
invalid address.
STATUS_INSUFFICIENT_RESOURCES - Insufficient system resources exist
for this request to complete.
--*/
{
NTSTATUS status = STATUS_SUCCESS;
BOOLEAN releaseModuleResoure = FALSE;
ULONG length = 0;
//
// Operate within a try block in order to catch errors.
//
try {
//
// Probe input and output buffers, if previous mode is not
// kernel.
//
if ( KeGetPreviousMode( ) != KernelMode ) {
if ( InputBufferLength != 0 ) {
ProbeForRead( InputBuffer, InputBufferLength, sizeof(ULONG) );
}
if ( OutputBufferLength != 0 ) {
ProbeForWrite( OutputBuffer, OutputBufferLength, sizeof(ULONG) );
}
if ( ARGUMENT_PRESENT(ReturnLength) ) {
ProbeForWriteUlong( ReturnLength );
}
}
//
// Switch on the command code.
//
switch ( Command ) {
#if i386
case SysDbgQueryTraceInformation:
status = KdGetTraceInformation(
OutputBuffer,
OutputBufferLength,
&length
);
break;
case SysDbgSetTracepoint:
if ( InputBufferLength != sizeof(DBGKD_MANIPULATE_STATE) ) {
return STATUS_INFO_LENGTH_MISMATCH;
}
KdSetInternalBreakpoint( InputBuffer );
break;
case SysDbgSetSpecialCall:
if ( InputBufferLength != sizeof(PVOID) ) {
return STATUS_INFO_LENGTH_MISMATCH;
}
KdSetSpecialCall( InputBuffer, NULL );
break;
case SysDbgClearSpecialCalls:
KdClearSpecialCalls( );
break;
case SysDbgQuerySpecialCalls:
status = KdQuerySpecialCalls(
OutputBuffer,
OutputBufferLength,
&length
);
break;
#endif
default:
//
// Invalid Command.
//
status = STATUS_INVALID_INFO_CLASS;
}
if ( ARGUMENT_PRESENT(ReturnLength) ) {
*ReturnLength = length;
}
}
except ( EXCEPTION_EXECUTE_HANDLER ) {
if ( releaseModuleResoure ) {
ExReleaseResource( &PsLoadedModuleResource );
KeLeaveCriticalRegion();
}
status = GetExceptionCode();
}
return status;
} // NtSystemDebugControl
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