296 lines
10 KiB
C
296 lines
10 KiB
C
/*++
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Copyright (c) 1990 Microsoft Corporation
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Module Name:
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kdinit.c
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Abstract:
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This module implements the initialization for the portable kernel debgger.
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Author:
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David N. Cutler 27-July-1990
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--*/
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#include "kdp.h"
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// Miscellaneous data from all over the kernel
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#define BAUD_OPTION "BAUDRATE"
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#define PORT_OPTION "DEBUGPORT"
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGEKD, KdInitSystem)
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#endif
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BOOLEAN KdInitSystem(IN PLOADER_PARAMETER_BLOCK LoaderBlock OPTIONAL, BOOLEAN StopInDebugger)
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/*++
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Routine Description:
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This routine initializes the portable kernel debugger.
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Arguments:
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LoaderBlock - Supplies a pointer to the LOADER_PARAMETER_BLOCK passed in from the OS Loader.
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StopInDebugger - Supplies a boolean value that determines whether a debug message and breakpoint are generated.
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Return Value:
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None.
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--*/
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{
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ULONG Index;
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BOOLEAN Initialize;
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PCHAR Options;
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PCHAR BaudOption;
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PCHAR PortOption;
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// If kernel debugger is already initialized, then return.
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if (KdDebuggerEnabled != FALSE) {
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return TRUE;
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}
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KiDebugRoutine = KdpStub;
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// Determine whether or not the debugger should be enabled.
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// Note that if LoaderBlock == NULL, then KdInitSystem was called
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// from BugCheck code. For this case the debugger is always enabled to report the bugcheck if possible.
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if (LoaderBlock != NULL) {
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KdpNtosImageBase = CONTAINING_RECORD((LoaderBlock->LoadOrderListHead.Flink), LDR_DATA_TABLE_ENTRY, InLoadOrderLinks)->DllBase;
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// Initialize the debugger data block list when called at startup time.
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InitializeListHead(&KdpDebuggerDataListHead);
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// Fill in and register the debugger's debugger data block.
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// Most fields are already initialized, some fields will not be filled in until later.
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KdDebuggerDataBlock.KernBase = (ULONG_PTR) KdpNtosImageBase;
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KdDebuggerDataBlock.KeUserCallbackDispatcher = (ULONG_PTR) KeUserCallbackDispatcher;
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KdRegisterDebuggerDataBlock(KDBG_TAG, &KdDebuggerDataBlock.Header, sizeof(KdDebuggerDataBlock));
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if (LoaderBlock->LoadOptions != NULL) {
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Options = LoaderBlock->LoadOptions;
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_strupr(Options);
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// If any of the port option, baud option, or debug is specified, then enable the debugger unless it is explictly disabled.
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Initialize = TRUE;
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PortOption = strstr(Options, PORT_OPTION);
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BaudOption = strstr(Options, BAUD_OPTION);
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if ((PortOption == NULL) && (BaudOption == NULL)) {
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if (strstr(Options, "DEBUG") == NULL) {
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Initialize = FALSE;
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}
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} else {
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if (PortOption) {
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PortOption = strstr(PortOption, "COM");
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if (PortOption) {
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KdDebugParameters.CommunicationPort = atol(PortOption + 3);
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}
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}
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if (BaudOption) {
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BaudOption += strlen(BAUD_OPTION);
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while (*BaudOption == ' ') {
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BaudOption++;
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}
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if (*BaudOption != '\0') {
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KdDebugParameters.BaudRate = atol(BaudOption + 1);
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}
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}
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}
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// If the debugger is explicitly disabled, then set to NODEBUG.
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if (strstr(Options, "NODEBUG")) {
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Initialize = FALSE;
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KdPitchDebugger = TRUE;
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}
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if (strstr(Options, "CRASHDEBUG")) {
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Initialize = FALSE;
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KdPitchDebugger = FALSE;
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}
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} else {
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// If the load options are not specified, then set to NODEBUG.
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KdPitchDebugger = TRUE;
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Initialize = FALSE;
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}
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} else {
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Initialize = TRUE;
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}
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if ((KdPortInitialize(&KdDebugParameters, LoaderBlock, Initialize) == FALSE) ||
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(Initialize == FALSE)) {
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return(TRUE);
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}
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// Set address of kernel debugger trap routine.
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KiDebugRoutine = KdpTrap;
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if (!KdpDebuggerStructuresInitialized) {
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KiDebugSwitchRoutine = KdpSwitchProcessor;
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KdpBreakpointInstruction = KDP_BREAKPOINT_VALUE;
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KdpOweBreakpoint = FALSE;
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// Initialize the breakpoint table.
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for (Index = 0; Index < BREAKPOINT_TABLE_SIZE; Index += 1) {
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KdpBreakpointTable[Index].Flags = 0;
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KdpBreakpointTable[Index].Address = NULL;
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KdpBreakpointTable[Index].DirectoryTableBase = 0L;
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}
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// Initialize TimeSlip
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KeInitializeDpc(&KdpTimeSlipDpc, KdpTimeSlipDpcRoutine, NULL);
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KeInitializeTimer(&KdpTimeSlipTimer);
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ExInitializeWorkItem(&KdpTimeSlipWorkItem, KdpTimeSlipWork, NULL);
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KdpDebuggerStructuresInitialized = TRUE ;
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}
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// Initialize timer facility - HACKHACK
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KeQueryPerformanceCounter(&KdPerformanceCounterRate);
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KdTimerStart.HighPart = 0L;
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KdTimerStart.LowPart = 0L;
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// Initialize ID for NEXT packet to send and Expect ID of next incoming packet.
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KdpNextPacketIdToSend = INITIAL_PACKET_ID | SYNC_PACKET_ID;
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KdpPacketIdExpected = INITIAL_PACKET_ID;
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// Mark debugger enabled.
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KdPitchDebugger = FALSE;
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KdDebuggerEnabled = TRUE;
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SharedUserData->KdDebuggerEnabled = TRUE;
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// If requested, stop in the kernel debugger.
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if (StopInDebugger) {
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DbgBreakPoint();
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}
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return TRUE;
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}
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BOOLEAN KdRegisterDebuggerDataBlock(IN ULONG Tag, IN PDBGKD_DEBUG_DATA_HEADER DataHeader, IN ULONG Size)
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/*++
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Routine Description:
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This routine is called by a component or driver to register a debugger data block.
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The data block is made accessible to the kernel debugger, thus providing a reliable method of exposing random data to debugger extensions.
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Arguments:
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Tag - Supplies a unique 4 byte tag which is used to identify the data block.
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DataHeader - Supplies the address of the debugger data block header.
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The OwnerTag field must contain a unique value, and the Size field must contain the size of the data block, including the
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header. If this block is already present, or there is already a block with the same value for OwnerTag, this one
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will not be inserted. If Size is incorrect, this code will not notice, but the usermode side of the debugger might not function correctly.
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Size - Supplies the size of the data block, including the header.
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Return Value:
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TRUE if the block was added to the list, FALSE if not.
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--*/
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{
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KIRQL OldIrql;
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PLIST_ENTRY List;
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PDBGKD_DEBUG_DATA_HEADER Header;
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KeAcquireSpinLock(&KdpDataSpinLock, &OldIrql);
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// Look for a record with the same tag or address
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List = KdpDebuggerDataListHead.Flink;
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while (List != &KdpDebuggerDataListHead) {
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Header = CONTAINING_RECORD(List, DBGKD_DEBUG_DATA_HEADER, List);
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List = List->Flink;
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if ((Header == DataHeader) || (Header->OwnerTag == Tag)) {
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KeReleaseSpinLock(&KdpDataSpinLock, OldIrql);
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return FALSE;
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}
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}
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// It wasn't already there, so add it.
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DataHeader->OwnerTag = Tag;
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DataHeader->Size = Size;
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InsertTailList(&KdpDebuggerDataListHead, &DataHeader->List);
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KeReleaseSpinLock(&KdpDataSpinLock, OldIrql);
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return TRUE;
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}
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VOID KdDeregisterDebuggerDataBlock(IN PDBGKD_DEBUG_DATA_HEADER DataHeader)
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/*++
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Routine Description:
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This routine is called to deregister a data block previously registered with KdRegisterDebuggerDataBlock.
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If the block is found in the list, it is removed.
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Arguments:
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DataHeader - Supplies the address of the data block which is to be removed from the list.
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--*/
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{
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KIRQL OldIrql;
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PLIST_ENTRY List;
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PDBGKD_DEBUG_DATA_HEADER Header;
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KeAcquireSpinLock(&KdpDataSpinLock, &OldIrql);
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// Make sure the data block is on our list before removing it.
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List = KdpDebuggerDataListHead.Flink;
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while (List != &KdpDebuggerDataListHead) {
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Header = CONTAINING_RECORD(List, DBGKD_DEBUG_DATA_HEADER, List);
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List = List->Flink;
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if (DataHeader == Header) {
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RemoveEntryList(&DataHeader->List);
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break;
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}
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}
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KeReleaseSpinLock(&KdpDataSpinLock, OldIrql);
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}
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VOID KdLogDbgPrint(IN PSTRING String)
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{
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KIRQL OldIrql;
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ULONG Length;
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ULONG LengthCopied;
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for (; ;) {
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if (KeTestSpinLock (&KdpPrintSpinLock)) {
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KeRaiseIrql (HIGH_LEVEL, &OldIrql);
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if (KiTryToAcquireSpinLock(&KdpPrintSpinLock)) {
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break; // got the lock
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}
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KeLowerIrql(OldIrql);
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}
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}
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if (KdPrintCircularBuffer) {
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Length = String->Length;
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// truncate ridiculous strings
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if (Length > KDPRINTBUFFERSIZE) {
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Length = KDPRINTBUFFERSIZE;
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}
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if (KdPrintWritePointer + Length <= KdPrintCircularBuffer+KDPRINTBUFFERSIZE) {
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LengthCopied = KdpMoveMemory(KdPrintWritePointer, String->Buffer, Length);
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KdPrintWritePointer += LengthCopied;
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if (KdPrintWritePointer >= KdPrintCircularBuffer+KDPRINTBUFFERSIZE) {
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KdPrintWritePointer = KdPrintCircularBuffer;
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KdPrintRolloverCount++;
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}
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} else {
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ULONG First = (ULONG)(KdPrintCircularBuffer + KDPRINTBUFFERSIZE - KdPrintWritePointer);
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LengthCopied = KdpMoveMemory(KdPrintWritePointer, String->Buffer, First);
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if (LengthCopied == First) {
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LengthCopied += KdpMoveMemory(KdPrintCircularBuffer, String->Buffer + First, Length - First);
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}
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if (LengthCopied > First) {
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KdPrintWritePointer = KdPrintCircularBuffer + LengthCopied - First;
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KdPrintRolloverCount++;
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} else {
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KdPrintWritePointer += LengthCopied;
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if (KdPrintWritePointer >= KdPrintCircularBuffer+KDPRINTBUFFERSIZE) {
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KdPrintWritePointer = KdPrintCircularBuffer;
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KdPrintRolloverCount++;
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}
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}
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}
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}
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KiReleaseSpinLock(&KdpPrintSpinLock);
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KeLowerIrql(OldIrql);
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}
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