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337 lines
9.5 KiB
337 lines
9.5 KiB
/*++
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Copyright (c) 2000 Microsoft Corporation
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Module Name:
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kdtrap.c
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Abstract:
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This module contains code to implement the target side of the portable
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kernel debugger.
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Author:
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David N. Cutler (davec) 14-May-2000
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Revision History:
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--*/
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#include "kdp.h"
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#pragma alloc_text(PAGEKD, KdpTrap)
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#pragma alloc_text(PAGEKD, KdIsThisAKdTrap)
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BOOLEAN
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KdpTrap (
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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 SecondChance
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)
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/*++
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Routine Description:
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This routine is called whenever a exception is dispatched and the kernel
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debugger is active.
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Arguments:
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TrapFrame - Supplies a pointer to a trap frame that describes the
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trap.
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ExceptionFrame - Supplies a pointer to a exception frame that describes
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the trap.
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ExceptionRecord - Supplies a pointer to an exception record that
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describes the exception.
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ContextRecord - Supplies the context at the time of the exception.
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PreviousMode - Supplies the previous processor mode.
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SecondChance - Supplies a boolean value that determines whether this is
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the second chance (TRUE) that the exception has been raised.
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Return Value:
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A value of TRUE is returned if the exception is handled. Otherwise, a
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value of FALSE is returned.
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--*/
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{
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BOOLEAN Completion = FALSE;
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BOOLEAN UnloadSymbols = FALSE;
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ULONG64 OldRip;
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//
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// Print, Prompt, Load symbols, Unload symbols, are all special
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// cases of STATUS_BREAKPOINT.
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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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// Switch on the breakpoint code.
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//
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OldRip = ContextRecord->Rip;
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switch (ExceptionRecord->ExceptionInformation[0]) {
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//
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// Print a debug string.
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//
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// Arguments:
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//
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// rcx - Supplies a pointer to an output string buffer.
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// dx - Supplies the length of the output string buffer.
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// r8d - Supplies the Id of the calling component.
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// r9d - Supplies the output filter level.
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//
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case BREAKPOINT_PRINT:
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ContextRecord->Rax = KdpPrint((ULONG)ContextRecord->R8,
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(ULONG)ContextRecord->R9,
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(PCHAR)ContextRecord->Rcx,
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(USHORT)ContextRecord->Rdx,
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PreviousMode,
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TrapFrame,
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ExceptionFrame,
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&Completion);
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break;
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//
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// Print a debug prompt string, then input a string.
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//
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// Arguments:
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//
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// rcx - Supplies a pointer to an output string buffer.
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// dx - Supplies the length of the output string buffer.
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// r8 - Supplies a pointer to an input string buffer.
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// r9w - Supplies the length of the input string bufffer.
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//
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case BREAKPOINT_PROMPT:
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ContextRecord->Rax = KdpPrompt((PCHAR)ContextRecord->Rcx,
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(USHORT)ContextRecord->Rdx,
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(PCHAR)ContextRecord->R8,
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(USHORT)ContextRecord->R9,
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PreviousMode,
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TrapFrame,
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ExceptionFrame);
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Completion = TRUE;
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break;
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//
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// Load the symbolic information for an image.
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//
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// Arguments:
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//
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// rcx - Supplies a pointer to a filename string descriptor.
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// rdx - Supplies the base address of the image.
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//
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case BREAKPOINT_UNLOAD_SYMBOLS:
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UnloadSymbols = TRUE;
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//
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// Fall through
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//
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case BREAKPOINT_LOAD_SYMBOLS:
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KdpSymbol((PSTRING)ContextRecord->Rcx,
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(PKD_SYMBOLS_INFO)ContextRecord->Rdx,
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UnloadSymbols,
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PreviousMode,
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ContextRecord,
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TrapFrame,
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ExceptionFrame);
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Completion = TRUE;
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break;
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case BREAKPOINT_COMMAND_STRING:
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KdpCommandString((PSTRING)ContextRecord->Rcx,
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(PSTRING)ContextRecord->Rdx,
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PreviousMode,
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ContextRecord,
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TrapFrame,
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ExceptionFrame);
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Completion = TRUE;
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break;
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//
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// Unknown command
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//
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default:
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break;
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}
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//
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// If the kernel debugger did not update RIP, then increment
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// past the breakpoint instruction.
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//
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if (ContextRecord->Rip == OldRip) {
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ContextRecord->Rip += 1;
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}
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} else {
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//
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// Report state change to the kernel debugger.
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//
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Completion = 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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SecondChance);
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}
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return Completion;
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}
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BOOLEAN
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KdIsThisAKdTrap (
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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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)
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/*++
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Routine Description:
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This routine is called whenever a user mode exception occurs and
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it might be a kernel debugger exception (e.g., DbgPrint/DbgPrompt).
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Arguments:
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ExceptionRecord - Supplies a pointer to an exception record that
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describes the exception.
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ContextRecord - Supplies the context at the time of the exception.
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PreviousMode - Supplies the previous processor mode.
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Return Value:
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A value of TRUE is returned if this is for the kernel debugger.
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Otherwise, a value of FALSE is returned.
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--*/
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{
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UNREFERENCED_PARAMETER(ContextRecord);
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UNREFERENCED_PARAMETER(PreviousMode);
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if (((ExceptionRecord->ExceptionCode == STATUS_BREAKPOINT) ||
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(ExceptionRecord->ExceptionCode == STATUS_WX86_BREAKPOINT)) &&
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(ExceptionRecord->NumberParameters > 0) &&
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(ExceptionRecord->ExceptionInformation[0] != BREAKPOINT_BREAK)) {
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return TRUE;
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} else {
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return FALSE;
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}
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}
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BOOLEAN
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KdpStub (
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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 SecondChance
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)
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/*++
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Routine Description:
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This routine provides a kernel debugger stub routine to catch debug
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prints in a checked system when the kernel debugger is not active.
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Arguments:
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TrapFrame - Supplies a pointer to a trap frame that describes the
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trap.
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ExceptionFrame - Supplies a pointer to a exception frame that describes
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the trap.
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ExceptionRecord - Supplies a pointer to an exception record that
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describes the exception.
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ContextRecord - Supplies the context at the time of the exception.
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PreviousMode - Supplies the previous processor mode.
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SecondChance - Supplies a boolean value that determines whether this is
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the second chance (TRUE) that the exception has been raised.
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Return Value:
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A value of TRUE is returned if the exception is handled. Otherwise a
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value of FALSE is returned.
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--*/
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{
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UNREFERENCED_PARAMETER(TrapFrame);
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UNREFERENCED_PARAMETER(ExceptionFrame);
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UNREFERENCED_PARAMETER(PreviousMode);
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UNREFERENCED_PARAMETER(SecondChance);
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//
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// If the breakpoint is a debug print or load/unload symbols, then return
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// TRUE. Otherwise, return FALSE.
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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_LOAD_SYMBOLS) ||
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(ExceptionRecord->ExceptionInformation[0] == BREAKPOINT_UNLOAD_SYMBOLS) ||
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(ExceptionRecord->ExceptionInformation[0] == BREAKPOINT_COMMAND_STRING) ||
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(ExceptionRecord->ExceptionInformation[0] == BREAKPOINT_PRINT))) {
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ContextRecord->Rip += 1;
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return TRUE;
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} else if (!KdPitchDebugger &&
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KdAutoEnableOnEvent &&
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KdPreviouslyEnabled &&
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!KdDebuggerEnabled) {
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// If there are multiple disables this may not reenable
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// the debugger. Check before calling the full trap routine.
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if (NT_SUCCESS(KdEnableDebugger()) &&
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KdDebuggerEnabled) {
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return KdpTrap(TrapFrame, ExceptionFrame, ExceptionRecord,
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ContextRecord, PreviousMode, SecondChance);
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} else {
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return FALSE;
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}
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} else {
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return FALSE;
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}
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}
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