mirror of
https://github.com/reactos/reactos.git
synced 2024-07-02 02:34:53 +00:00
112 lines
2.3 KiB
C
112 lines
2.3 KiB
C
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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* FILE: ntoskrnl/kdbg/amd64/kdb.c
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* PURPOSE: Kernel Debugger
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* PROGRAMMERS:
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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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ULONG
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NTAPI
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KiEspFromTrapFrame(IN PKTRAP_FRAME TrapFrame)
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{
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return TrapFrame->Rsp;
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}
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VOID
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NTAPI
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KiEspToTrapFrame(IN PKTRAP_FRAME TrapFrame,
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IN ULONG_PTR Esp)
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{
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KIRQL OldIrql;
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ULONG Previous;
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/* Raise to APC_LEVEL if needed */
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OldIrql = KeGetCurrentIrql();
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if (OldIrql < APC_LEVEL) KeRaiseIrql(APC_LEVEL, &OldIrql);
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/* Get the old ESP */
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Previous = KiEspFromTrapFrame(TrapFrame);
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/* Check if this is user-mode */
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if ((TrapFrame->SegCs & MODE_MASK))
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{
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/* Write it directly */
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TrapFrame->Rsp = Esp;
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}
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else
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{
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/* Don't allow ESP to be lowered, this is illegal */
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if (Esp < Previous) KeBugCheckEx(SET_OF_INVALID_CONTEXT,
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Esp,
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Previous,
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(ULONG_PTR)TrapFrame,
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0);
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/* Create an edit frame, check if it was alrady */
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if (!(TrapFrame->SegCs & FRAME_EDITED))
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{
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/* Update the value */
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TrapFrame->Rsp = Esp;
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}
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else
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{
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/* Check if ESP changed */
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if (Previous != Esp)
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{
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/* Save CS */
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TrapFrame->SegCs &= ~FRAME_EDITED;
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/* Save ESP */
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TrapFrame->Rsp = Esp;
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}
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}
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}
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/* Restore IRQL */
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if (OldIrql < APC_LEVEL) KeLowerIrql(OldIrql);
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}
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ULONG
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NTAPI
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KiSsFromTrapFrame(IN PKTRAP_FRAME TrapFrame)
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{
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if (TrapFrame->SegCs & MODE_MASK)
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{
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/* User mode, return the User SS */
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return TrapFrame->SegSs | RPL_MASK;
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}
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else
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{
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/* Kernel mode */
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return KGDT64_SYS_TSS;
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}
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}
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VOID
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NTAPI
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KiSsToTrapFrame(IN PKTRAP_FRAME TrapFrame,
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IN ULONG Ss)
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{
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/* Remove the high-bits */
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Ss &= 0xFFFF;
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if (TrapFrame->SegCs & MODE_MASK)
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{
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/* Usermode, save the User SS */
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TrapFrame->SegSs = Ss | RPL_MASK;
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}
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}
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