185 lines
5.2 KiB
NASM
185 lines
5.2 KiB
NASM
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title "Processor State Save Restore"
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;++
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;
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; Copyright (c) 1989 Microsoft Corporation
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;
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; Module Name:
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;
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; procstat.asm
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;
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; Abstract:
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;
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; This module implements procedures for saving and restoring
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; processor control state, and processor run&control state.
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; These procedures support debugging of UP and MP systems.
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;
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; Author:
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;
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; Shie-Lin Tzong (shielint) 30-Aug-1990
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;
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; Environment:
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;
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; Kernel mode only.
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;
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; Revision History:
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;
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;--
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.586p
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.xlist
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include ks386.inc
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include callconv.inc
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.list
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page ,132
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KDCODE SEGMENT DWORD PUBLIC 'CODE'
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ASSUME DS:FLAT, ES:FLAT, SS:NOTHING, FS:NOTHING, GS:NOTHING
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page ,132
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subttl "Save Processor Control State"
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;++
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;
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; KdpSaveProcessorControlState(
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; PX86_NT5_KPROCESSOR_STATE ProcessorState
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; );
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;
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; Routine Description:
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;
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; This routine saves the control subset of the processor state.
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; (Saves the same information as KdpSaveProcessorState EXCEPT that
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; data in TrapFrame/ExceptionFrame=Context record is NOT saved.)
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; Called by the debug subsystem, and KdpSaveProcessorState()
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;
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; N.B. This procedure will save Dr7, and then 0 it. This prevents
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; recursive hardware trace breakpoints and allows debuggers
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; to work.
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;
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; Arguments:
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;
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; Return Value:
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;
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; None.
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;
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;--
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cPublicProc _KdpSaveProcessorControlState ,1
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mov edx, [esp+4] ; ProcessorState
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;
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; Save special registers for debugger
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;
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xor ecx,ecx
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mov eax, cr0
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mov [edx].PsNT5SpecialRegisters.SrNT5Cr0, eax
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mov eax, cr2
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mov [edx].PsNT5SpecialRegisters.SrNT5Cr2, eax
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mov eax, cr3
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mov [edx].PsNT5SpecialRegisters.SrNT5Cr3, eax
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mov eax, cr4
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mov [edx].PsNT5SpecialRegisters.SrNT5Cr4, eax
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mov eax,dr0
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mov [edx].PsNT5SpecialRegisters.SrNT5KernelDr0,eax
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mov eax,dr1
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mov [edx].PsNT5SpecialRegisters.SrNT5KernelDr1,eax
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mov eax,dr2
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mov [edx].PsNT5SpecialRegisters.SrNT5KernelDr2,eax
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mov eax,dr3
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mov [edx].PsNT5SpecialRegisters.SrNT5KernelDr3,eax
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mov eax,dr6
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mov [edx].PsNT5SpecialRegisters.SrNT5KernelDr6,eax
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mov eax,dr7
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mov dr7,ecx
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mov [edx].PsNT5SpecialRegisters.SrNT5KernelDr7,eax
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sgdt fword ptr [edx].PsNT5SpecialRegisters.SrNT5Gdtr
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sidt fword ptr [edx].PsNT5SpecialRegisters.SrNT5Idtr
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str word ptr [edx].PsNT5SpecialRegisters.SrNT5Tr
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sldt word ptr [edx].PsNT5SpecialRegisters.SrNT5Ldtr
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stdRET _KdpSaveProcessorControlState
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stdENDP _KdpSaveProcessorControlState
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page ,132
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subttl "Restore Processor Control State"
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;++
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;
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; KdpRestoreProcessorControlState(
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; PX86_NT5_KPROCESSOR_STATE ProcessorState
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; );
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;
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; Routine Description:
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;
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; This routine restores the control subset of the processor state.
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; (Restores the same information as KdpRestoreProcessorState EXCEPT that
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; data in TrapFrame/ExceptionFrame=Context record is NOT restored.)
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; Called by the debug subsystem, and KdpRestoreProcessorState()
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;
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; Arguments:
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;
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; Return Value:
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;
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; None.
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;
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;--
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cPublicProc _KdpRestoreProcessorControlState,1
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mov edx, [esp+4] ; (edx)->ProcessorState
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;
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; Restore special registers for debugger
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;
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mov eax, [edx].PsNT5SpecialRegisters.SrNT5Cr0
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mov cr0, eax
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mov eax, [edx].PsNT5SpecialRegisters.SrNT5Cr2
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mov cr2, eax
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mov eax, [edx].PsNT5SpecialRegisters.SrNT5Cr3
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mov cr3, eax
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mov eax, [edx].PsNT5SpecialRegisters.SrNT5Cr4
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mov cr4, eax
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mov eax, [edx].PsNT5SpecialRegisters.SrNT5KernelDr0
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mov dr0, eax
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mov eax, [edx].PsNT5SpecialRegisters.SrNT5KernelDr1
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mov dr1, eax
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mov eax, [edx].PsNT5SpecialRegisters.SrNT5KernelDr2
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mov dr2, eax
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mov eax, [edx].PsNT5SpecialRegisters.SrNT5KernelDr3
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mov dr3, eax
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mov eax, [edx].PsNT5SpecialRegisters.SrNT5KernelDr6
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mov dr6, eax
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mov eax, [edx].PsNT5SpecialRegisters.SrNT5KernelDr7
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mov dr7, eax
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lgdt fword ptr [edx].PsNT5SpecialRegisters.SrNT5Gdtr
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lidt fword ptr [edx].PsNT5SpecialRegisters.SrNT5Idtr
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;
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; Force the TSS descriptor into a non-busy state, so we don't fault
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; when we load the TR.
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;
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mov eax, [edx].PsNT5SpecialRegisters.SrNT5Gdtr+2 ; (eax)->GDT base
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xor ecx, ecx
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mov cx, word ptr [edx].PsNT5SpecialRegisters.SrNT5Tr
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add eax, 5
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add eax, ecx ; (eax)->TSS Desc. Byte
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and byte ptr [eax],NOT 2
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ltr word ptr [edx].PsNT5SpecialRegisters.SrNT5Tr
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lldt word ptr [edx].PsNT5SpecialRegisters.SrNT5Ldtr
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stdRET _KdpRestoreProcessorControlState
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stdENDP _KdpRestoreProcessorControlState
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KDCODE ENDS
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END
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