475 lines
12 KiB
C
475 lines
12 KiB
C
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/*++
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Copyright (c) 1990 Microsoft Corporation
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Copyright (c) 1998 Intel 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 27-July-1990
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Revision History:
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--*/
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#include "kdp.h"
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#ifdef _GAMBIT_
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#include "ssc.h"
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#endif // _GAMBIT_
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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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ULONGLONG OldStIIP, OldStIPSR;
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//
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// Disable all hardware breakpoints
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//
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KeSetLowPsrBit(PSR_DB, 0);
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//
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// Synchronize processor execution, save processor state, enter debugger,
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// and flush the current TB.
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//
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KeFlushCurrentTb();
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//
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// If this is a breakpoint instruction, then check to determine if is
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// an internal command.
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//
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if ((ExceptionRecord->ExceptionCode == STATUS_BREAKPOINT) &&
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(ExceptionRecord->ExceptionInformation[0] >= BREAKPOINT_PRINT)) {
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//
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// Switch on the breakpoint code.
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//
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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: IA64 passes arguments via RSE not GR's. Since arguments are not
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// part of CONTEXT struct, they need to be copies Temp registers.
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// (see NTOS/RTL/IA64/DEBUGSTB.S)
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//
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// T0 - Supplies a pointer to an output string buffer.
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// T1 - Supplies the length of the output string buffer.
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// T2 - Supplies the Id of the calling component.
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// T3 - Supplies the output filter level.
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//
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case BREAKPOINT_PRINT:
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//
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// Advance to next instruction slot so that the BREAK instruction
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// does not get re-executed.
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//
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RtlIa64IncrementIP((ULONG_PTR)ExceptionRecord->ExceptionAddress >> 2,
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ContextRecord->StIPSR,
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ContextRecord->StIIP);
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//
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// Print the debug message.
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//
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ContextRecord->IntV0 = KdpPrint((ULONG)ContextRecord->IntT2,
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(ULONG)ContextRecord->IntT3,
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(PCHAR)ContextRecord->IntT0,
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(USHORT)ContextRecord->IntT1,
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PreviousMode,
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TrapFrame,
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ExceptionFrame,
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&Completion);
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return Completion;
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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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// T0 - Supplies a pointer to an output string buffer.
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// T1 - Supplies the length of the output string buffer..
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// T2 - supplies a pointer to an input string buffer.
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// T3 - Supplies the length of the input string bufffer.
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//
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case BREAKPOINT_PROMPT:
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//
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// Advance to next instruction slot so that the BREAK instruction
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// does not get re-executed.
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//
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RtlIa64IncrementIP((ULONG_PTR)ExceptionRecord->ExceptionAddress >> 2,
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ContextRecord->StIPSR,
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ContextRecord->StIIP);
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ContextRecord->IntV0 = KdpPrompt((PCHAR)ContextRecord->IntT0,
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(USHORT)ContextRecord->IntT1,
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(PCHAR)ContextRecord->IntT2,
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(USHORT)ContextRecord->IntT3,
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PreviousMode,
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TrapFrame,
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ExceptionFrame);
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return TRUE;
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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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// T0 - Supplies a pointer to an output string descriptor.
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// T1 - Supplies a 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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OldStIPSR = ContextRecord->StIPSR;
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OldStIIP = ContextRecord->StIIP;
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KdpSymbol((PSTRING)ContextRecord->IntT0,
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(PKD_SYMBOLS_INFO)ContextRecord->IntT1,
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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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//
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// If the kernel debugger did not update the IP, then increment
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// past the breakpoint instruction.
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//
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if ((ContextRecord->StIIP == OldStIIP) &&
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((ContextRecord->StIPSR & IPSR_RI_MASK) == (OldStIPSR & IPSR_RI_MASK))) {
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RtlIa64IncrementIP((ULONG_PTR)ExceptionRecord->ExceptionAddress >> 2,
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ContextRecord->StIPSR,
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ContextRecord->StIIP);
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}
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return TRUE;
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case BREAKPOINT_COMMAND_STRING:
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OldStIPSR = ContextRecord->StIPSR;
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OldStIIP = ContextRecord->StIIP;
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KdpCommandString((PSTRING)ContextRecord->IntT0,
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(PSTRING)ContextRecord->IntT1,
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PreviousMode,
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ContextRecord,
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TrapFrame,
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ExceptionFrame);
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//
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// If the kernel debugger did not update the IP, then increment
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// past the breakpoint instruction.
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//
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if ((ContextRecord->StIIP == OldStIIP) &&
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((ContextRecord->StIPSR & IPSR_RI_MASK) == (OldStIPSR & IPSR_RI_MASK))) {
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RtlIa64IncrementIP((ULONG_PTR)ExceptionRecord->ExceptionAddress >> 2,
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ContextRecord->StIPSR,
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ContextRecord->StIIP);
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}
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return TRUE;
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//
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// Kernel breakin break
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//
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case BREAKPOINT_BREAKIN:
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//
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// Advance to next instruction slot so that the BREAK instruction
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// does not get re-executed
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//
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RtlIa64IncrementIP((ULONG_PTR)ExceptionRecord->ExceptionAddress >> 2,
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ContextRecord->StIPSR,
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ContextRecord->StIIP);
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break;
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//
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// Basic breakpoint.
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//
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case BREAKPOINT_STOP:
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break;
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//
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// Unknown internal command.
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//
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default:
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return FALSE;
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}
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}
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//
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// Report state change to the kernel debugger.
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//
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return 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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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 (Like 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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ULONG_PTR BreakpointCode;
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//
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// Single step is also handled by the kernel debugger
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//
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if (ExceptionRecord->ExceptionCode == STATUS_SINGLE_STEP) {
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#if DEVL
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return TRUE;
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#else
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if (PreviousMode == KernelMode) {
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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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#endif
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}
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//
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// If is is not status breakpoint then it is not a kernel debugger trap.
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//
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if (ExceptionRecord->ExceptionCode != STATUS_BREAKPOINT) {
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return FALSE;
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}
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//
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// Isolate the breakpoint code from the breakpoint instruction which
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// is stored by the exception dispatch code in the information field
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// of the exception record.
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//
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BreakpointCode = (ULONG) ExceptionRecord->ExceptionInformation[0];
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//
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// Switch on the breakpoint code.
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//
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switch (BreakpointCode) {
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//
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// Kernel breakpoint codes.
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//
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case KERNEL_BREAKPOINT:
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case BREAKPOINT_BREAKIN:
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case BREAKPOINT_PRINT:
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case BREAKPOINT_PROMPT:
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case BREAKPOINT_STOP:
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return TRUE;
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case BREAKPOINT_LOAD_SYMBOLS:
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case BREAKPOINT_UNLOAD_SYMBOLS:
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if (PreviousMode == KernelMode) {
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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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// All other codes.
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//
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default:
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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 that catchs debug
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prints in checked systems 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
|
|||
|
|
describes the exception.
|
|||
|
|
|
|||
|
|
ContextRecord - Supplies the context at the time of the exception.
|
|||
|
|
|
|||
|
|
PreviousMode - Supplies the previous processor mode.
|
|||
|
|
|
|||
|
|
SecondChance - Supplies a boolean value that determines whether this is
|
|||
|
|
the second chance (TRUE) that the exception has been raised.
|
|||
|
|
|
|||
|
|
Return Value:
|
|||
|
|
|
|||
|
|
A value of TRUE is returned if the exception is handled. Otherwise a
|
|||
|
|
value of FALSE is returned.
|
|||
|
|
|
|||
|
|
--*/
|
|||
|
|
|
|||
|
|
{
|
|||
|
|
|
|||
|
|
ULONG_PTR BreakpointCode;
|
|||
|
|
|
|||
|
|
//
|
|||
|
|
// Isolate the breakpoint code from the breakpoint instruction which
|
|||
|
|
// is stored by the exception dispatch code in the information field
|
|||
|
|
// of the exception record.
|
|||
|
|
//
|
|||
|
|
|
|||
|
|
BreakpointCode = (ULONG) ExceptionRecord->ExceptionInformation[0];
|
|||
|
|
|
|||
|
|
|
|||
|
|
//
|
|||
|
|
// If the breakpoint is a debug print, debug load symbols, or debug
|
|||
|
|
// unload symbols, then return TRUE. Otherwise, return FALSE;
|
|||
|
|
//
|
|||
|
|
|
|||
|
|
if ((BreakpointCode == BREAKPOINT_PRINT) ||
|
|||
|
|
(BreakpointCode == BREAKPOINT_LOAD_SYMBOLS) ||
|
|||
|
|
(BreakpointCode == BREAKPOINT_UNLOAD_SYMBOLS)) {
|
|||
|
|
|
|||
|
|
//
|
|||
|
|
// Advance to next instruction slot so that the BREAK instruction
|
|||
|
|
// does not get re-executed
|
|||
|
|
//
|
|||
|
|
|
|||
|
|
RtlIa64IncrementIP((ULONG_PTR)ExceptionRecord->ExceptionAddress >> 2,
|
|||
|
|
ContextRecord->StIPSR,
|
|||
|
|
ContextRecord->StIIP);
|
|||
|
|
|
|||
|
|
|
|||
|
|
return TRUE;
|
|||
|
|
|
|||
|
|
} else {
|
|||
|
|
return FALSE;
|
|||
|
|
}
|
|||
|
|
}
|