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https://github.com/reactos/reactos.git
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6e9ff14e26
Addendum to608032bdand835c3023. The IRQL is actually raised by KeFreezeExecution() and lowered by KeThawExecution(), always to HIGH_IRQL on MP systems, or if necessary on UP. These functions are called respectively by KdEnterDebugger() and KdExitDebugger().
342 lines
11 KiB
C
342 lines
11 KiB
C
/*
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* PROJECT: ReactOS Kernel
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* LICENSE: GPL - See COPYING in the top level directory
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* FILE: ntoskrnl/kd64/kdtrap.c
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* PURPOSE: KD64 Trap Handlers
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* PROGRAMMERS: Alex Ionescu (alex.ionescu@reactos.org)
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* Stefan Ginsberg (stefan.ginsberg@reactos.org)
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*/
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/* INCLUDES ******************************************************************/
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#include <ntoskrnl.h>
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#define NDEBUG
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#include <debug.h>
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//
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// Retrieves the ComponentId and Level for BREAKPOINT_PRINT
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// and OutputString and OutputStringLength for BREAKPOINT_PROMPT.
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//
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#if defined(_X86_)
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//
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// EBX/EDI on x86
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//
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#define KdpGetParameterThree(Context) ((Context)->Ebx)
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#define KdpGetParameterFour(Context) ((Context)->Edi)
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#elif defined(_AMD64_)
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//
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// R8/R9 on AMD64
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//
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#define KdpGetParameterThree(Context) ((Context)->R8)
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#define KdpGetParameterFour(Context) ((Context)->R9)
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#elif defined(_ARM_)
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//
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// R3/R4 on ARM
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//
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#define KdpGetParameterThree(Context) ((Context)->R3)
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#define KdpGetParameterFour(Context) ((Context)->R4)
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#else
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#error Unsupported Architecture
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#endif
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/* FUNCTIONS *****************************************************************/
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BOOLEAN
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NTAPI
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KdpReport(IN PKTRAP_FRAME TrapFrame,
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IN PKEXCEPTION_FRAME ExceptionFrame,
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IN PEXCEPTION_RECORD ExceptionRecord,
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IN PCONTEXT ContextRecord,
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IN KPROCESSOR_MODE PreviousMode,
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IN BOOLEAN SecondChanceException)
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{
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BOOLEAN Enable, Handled;
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PKPRCB Prcb;
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NTSTATUS ExceptionCode;
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/*
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* Determine whether to pass the exception to the debugger.
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* First, check if this is a "debug exception", meaning breakpoint
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* (including debug service), single step and assertion failure exceptions.
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*/
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ExceptionCode = ExceptionRecord->ExceptionCode;
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if ((ExceptionCode == STATUS_BREAKPOINT) ||
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(ExceptionCode == STATUS_SINGLE_STEP) ||
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(ExceptionCode == STATUS_ASSERTION_FAILURE))
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{
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/* This is a debug exception; we always pass them to the debugger */
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}
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else if (NtGlobalFlag & FLG_STOP_ON_EXCEPTION)
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{
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/*
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* Not a debug exception, but the stop-on-exception flag is set,
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* meaning the debugger requests that we pass it first chance
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* exceptions. However, some exceptions are always passed to the
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* exception handler first, namely exceptions with a code that isn't
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* an error or warning code, and also exceptions with the special
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* STATUS_PORT_DISCONNECTED code (an error code).
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*/
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if ((SecondChanceException == FALSE) &&
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((ExceptionCode == STATUS_PORT_DISCONNECTED) ||
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(NT_SUCCESS(ExceptionCode))))
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{
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/* Let the exception handler, if any, try to handle it */
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return FALSE;
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}
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}
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else if (SecondChanceException == FALSE)
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{
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/*
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* This isn't a debug exception and the stop-on-exception flag isn't set,
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* so don't bother handling it
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*/
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return FALSE;
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}
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/* Enter the debugger */
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Enable = KdEnterDebugger(TrapFrame, ExceptionFrame);
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/*
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* Get the KPRCB and save the CPU Control State manually instead of
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* using KiSaveProcessorState, since we already have a valid CONTEXT.
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*/
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Prcb = KeGetCurrentPrcb();
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KiSaveProcessorControlState(&Prcb->ProcessorState);
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KdpMoveMemory(&Prcb->ProcessorState.ContextFrame,
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ContextRecord,
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sizeof(CONTEXT));
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/* Report the new state */
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Handled = KdpReportExceptionStateChange(ExceptionRecord,
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&Prcb->ProcessorState.
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ContextFrame,
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SecondChanceException);
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/* Now restore the processor state, manually again. */
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KdpMoveMemory(ContextRecord,
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&Prcb->ProcessorState.ContextFrame,
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sizeof(CONTEXT));
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KiRestoreProcessorControlState(&Prcb->ProcessorState);
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/* Exit the debugger and clear the CTRL-C state */
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KdExitDebugger(Enable);
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KdpControlCPressed = FALSE;
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return Handled;
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}
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BOOLEAN
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NTAPI
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KdpTrap(IN PKTRAP_FRAME TrapFrame,
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IN PKEXCEPTION_FRAME ExceptionFrame,
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IN PEXCEPTION_RECORD ExceptionRecord,
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IN PCONTEXT ContextRecord,
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IN KPROCESSOR_MODE PreviousMode,
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IN BOOLEAN SecondChanceException)
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{
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BOOLEAN Unload;
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ULONG_PTR ProgramCounter;
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BOOLEAN Handled;
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NTSTATUS ReturnStatus;
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USHORT ReturnLength;
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/*
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* Check if we got a STATUS_BREAKPOINT with a SubID for Print, Prompt or
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* Load/Unload symbols. Make sure it isn't a software breakpoints as those
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* are handled by KdpReport.
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*/
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if ((ExceptionRecord->ExceptionCode == STATUS_BREAKPOINT) &&
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(ExceptionRecord->ExceptionInformation[0] != BREAKPOINT_BREAK))
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{
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/* Save Program Counter */
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ProgramCounter = KeGetContextPc(ContextRecord);
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/* Check what kind of operation was requested from us */
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Unload = FALSE;
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switch (ExceptionRecord->ExceptionInformation[0])
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{
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/* DbgPrint */
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case BREAKPOINT_PRINT:
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/* Call the worker routine */
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ReturnStatus = KdpPrint((ULONG)KdpGetParameterThree(ContextRecord),
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(ULONG)KdpGetParameterFour(ContextRecord),
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(PCHAR)ExceptionRecord->ExceptionInformation[1],
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(USHORT)ExceptionRecord->ExceptionInformation[2],
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PreviousMode,
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TrapFrame,
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ExceptionFrame,
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&Handled);
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/* Update the return value for the caller */
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KeSetContextReturnRegister(ContextRecord, ReturnStatus);
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break;
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/* DbgPrompt */
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case BREAKPOINT_PROMPT:
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/* Call the worker routine */
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ReturnLength = KdpPrompt((PCHAR)ExceptionRecord->ExceptionInformation[1],
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(USHORT)ExceptionRecord->ExceptionInformation[2],
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(PCHAR)KdpGetParameterThree(ContextRecord),
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(USHORT)KdpGetParameterFour(ContextRecord),
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PreviousMode,
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TrapFrame,
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ExceptionFrame);
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Handled = TRUE;
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/* Update the return value for the caller */
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KeSetContextReturnRegister(ContextRecord, ReturnLength);
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break;
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/* DbgUnLoadImageSymbols */
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case BREAKPOINT_UNLOAD_SYMBOLS:
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/* Drop into the load case below, with the unload parameter */
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Unload = TRUE;
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/* DbgLoadImageSymbols */
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case BREAKPOINT_LOAD_SYMBOLS:
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/* Call the worker routine */
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KdpSymbol((PSTRING)ExceptionRecord->ExceptionInformation[1],
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(PKD_SYMBOLS_INFO)ExceptionRecord->ExceptionInformation[2],
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Unload,
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PreviousMode,
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ContextRecord,
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TrapFrame,
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ExceptionFrame);
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Handled = TRUE;
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break;
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/* DbgCommandString */
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case BREAKPOINT_COMMAND_STRING:
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/* Call the worker routine */
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KdpCommandString((PSTRING)ExceptionRecord->ExceptionInformation[1],
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(PSTRING)ExceptionRecord->ExceptionInformation[2],
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PreviousMode,
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ContextRecord,
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TrapFrame,
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ExceptionFrame);
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Handled = TRUE;
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break;
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/* Anything else, do nothing */
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default:
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/* Invalid debug service! Don't handle this! */
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Handled = FALSE;
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break;
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}
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/*
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* If the PC was not updated, we'll increment it ourselves so execution
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* continues past the breakpoint.
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*/
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if (ProgramCounter == KeGetContextPc(ContextRecord))
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{
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/* Update it */
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KeSetContextPc(ContextRecord,
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ProgramCounter + KD_BREAKPOINT_SIZE);
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}
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}
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else
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{
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/* Call the worker routine */
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Handled = KdpReport(TrapFrame,
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ExceptionFrame,
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ExceptionRecord,
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ContextRecord,
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PreviousMode,
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SecondChanceException);
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}
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/* Return TRUE or FALSE to caller */
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return Handled;
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}
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BOOLEAN
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NTAPI
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KdpStub(IN PKTRAP_FRAME TrapFrame,
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IN PKEXCEPTION_FRAME ExceptionFrame,
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IN PEXCEPTION_RECORD ExceptionRecord,
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IN PCONTEXT ContextRecord,
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IN KPROCESSOR_MODE PreviousMode,
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IN BOOLEAN SecondChanceException)
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{
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ULONG_PTR ExceptionCommand;
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/* Check if this was a breakpoint due to DbgPrint or Load/UnloadSymbols */
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ExceptionCommand = ExceptionRecord->ExceptionInformation[0];
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if ((ExceptionRecord->ExceptionCode == STATUS_BREAKPOINT) &&
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(ExceptionRecord->NumberParameters > 0) &&
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((ExceptionCommand == BREAKPOINT_LOAD_SYMBOLS) ||
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(ExceptionCommand == BREAKPOINT_UNLOAD_SYMBOLS) ||
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(ExceptionCommand == BREAKPOINT_COMMAND_STRING) ||
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(ExceptionCommand == BREAKPOINT_PRINT)))
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{
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/* This we can handle: simply bump the Program Counter */
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KeSetContextPc(ContextRecord,
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KeGetContextPc(ContextRecord) + KD_BREAKPOINT_SIZE);
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return TRUE;
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}
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else if (KdPitchDebugger)
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{
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/* There's no debugger, fail. */
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return FALSE;
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}
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else if ((KdAutoEnableOnEvent) &&
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(KdPreviouslyEnabled) &&
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!(KdDebuggerEnabled) &&
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(NT_SUCCESS(KdEnableDebugger())) &&
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(KdDebuggerEnabled))
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{
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/* Debugging was Auto-Enabled. We can now send this to KD. */
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return KdpTrap(TrapFrame,
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ExceptionFrame,
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ExceptionRecord,
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ContextRecord,
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PreviousMode,
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SecondChanceException);
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}
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else
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{
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/* FIXME: All we can do in this case is trace this exception */
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return FALSE;
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}
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}
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BOOLEAN
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NTAPI
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KdIsThisAKdTrap(IN PEXCEPTION_RECORD ExceptionRecord,
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IN PCONTEXT Context,
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IN KPROCESSOR_MODE PreviousMode)
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{
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#ifdef _WINKD_
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/*
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* Determine if this is a valid debug service call and make sure that
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* it isn't a software breakpoint
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*/
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if ((ExceptionRecord->ExceptionCode == STATUS_BREAKPOINT) &&
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(ExceptionRecord->NumberParameters > 0) &&
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(ExceptionRecord->ExceptionInformation[0] != BREAKPOINT_BREAK))
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{
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/* Then we have to handle it */
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return TRUE;
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}
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else
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{
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/* We don't have to handle it */
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return FALSE;
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}
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#else
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/* KDBG has its own mechanism for ignoring user mode exceptions */
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return FALSE;
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#endif
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}
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