You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
247 lines
8.5 KiB
247 lines
8.5 KiB
title "Miscellaneous Functions"
|
|
;++
|
|
;
|
|
; Copyright (c) 2000 Microsoft Corporation
|
|
;
|
|
; Module Name:
|
|
;
|
|
; miscs.asm
|
|
;
|
|
; Abstract:
|
|
;
|
|
; This module implements machine dependent miscellaneous kernel functions.
|
|
;
|
|
; Author:
|
|
;
|
|
; David N. Cutler (davec) 8-Aug-2000
|
|
;
|
|
; Environment:
|
|
;
|
|
; Kernel mode only.
|
|
;
|
|
;--
|
|
|
|
include ksamd64.inc
|
|
|
|
extern KeTestAlertThread:proc
|
|
extern KiContinue:proc
|
|
extern KiExceptionExit:proc
|
|
extern KiRaiseException:proc
|
|
|
|
subttl "Continue Execution System Service"
|
|
;++
|
|
;
|
|
; NTSTATUS
|
|
; NtContinue (
|
|
; IN PCONTEXT ContextRecord,
|
|
; IN BOOLEAN TestAlert
|
|
; )
|
|
;
|
|
; Routine Description:
|
|
;
|
|
; This routine is called as a system service to continue execution after
|
|
; an exception has occurred. Its function is to transfer information from
|
|
; the specified context record into the trap frame that was built when the
|
|
; system service was executed, and then exit the system as if an exception
|
|
; had occurred.
|
|
;
|
|
; Arguments:
|
|
;
|
|
; ContextRecord (rcx) - Supplies a pointer to a context record.
|
|
;
|
|
; TestAlert (dl) - Supplies a boolean value that specifies whether alert
|
|
; should be tested for the previous processor mode.
|
|
;
|
|
; Implicit Arguments:
|
|
;
|
|
; rbp - Supplies the address of a trap frame.
|
|
;
|
|
; Return Value:
|
|
;
|
|
; Normally there is no return from this routine. However, if the specified
|
|
; context record is misaligned or is not accessible, then the appropriate
|
|
; status code is returned.
|
|
;
|
|
;--
|
|
|
|
NESTED_ENTRY NtContinue, _TEXT$00
|
|
|
|
GENERATE_EXCEPTION_FRAME ; generate exception frame
|
|
|
|
;
|
|
; Transfer information from the context frame to the exception and trap frames.
|
|
;
|
|
|
|
mov rbx, gs:[PcCurrentThread] ; get current thread address
|
|
cmp byte ptr ThNpxState[rbx],LEGACY_STATE_SWITCH ; check if switched
|
|
jne short KiCO10 ; if ne, legacy state not switched
|
|
|
|
;
|
|
; N.B. The legacy floating point state must be saved and restored since saving
|
|
; the state initializes some of the state.
|
|
;
|
|
; N.B. Interrupts must also be disabled during this sequence to ensure that a
|
|
; get context APC interrupt does not occur.
|
|
;
|
|
|
|
lea rsi, (KTRAP_FRAME_LENGTH - 128)[rbp] ; get legacy save address
|
|
cli ; disable interrupts
|
|
fnsaved [rsi] ; save legacy floating state
|
|
mov di, LfControlWord[rsi] ; save current control word
|
|
mov word ptr LfControlWord[rsi], 03fh ; set to mask all exceptions
|
|
frstord [rsi] ; restore legacy floating point state
|
|
mov LfControlWord[rsi], di ; restore control word
|
|
fldcw word ptr LfControlWord[rsi] ; load legacy control word
|
|
sti ; enable interrupt
|
|
KiCO10: mov dil, dl ; save test alert argument
|
|
mov rdx, rsp ; set exception frame address
|
|
lea r8, (-128)[rbp] ; set trap frame address
|
|
call KiContinue ; transfer context to kernel frames
|
|
|
|
;
|
|
; If the kernel continuation routine returns success, then exit via the
|
|
; exception exit code. Otherwise, return to the system service dispatcher.
|
|
;
|
|
|
|
test eax, eax ; test if service failed
|
|
jnz short KiCO40 ; if nz, service failed
|
|
|
|
;
|
|
; Check to determine if alert should be tested for the previous processor
|
|
; mode and restore the previous mode in the thread object.
|
|
;
|
|
|
|
mov r8, TrTrapFrame[rbp] ; set previous trap frame address
|
|
mov ThTrapFrame[rbx], r8 ;
|
|
mov cl, ThPreviousMode[rbx] ; get thread previous mode
|
|
mov dl, TrPreviousMode[rbp] ; get frame previous mode
|
|
mov ThPreviousMode[rbx], dl ; set thread previous mode
|
|
test dil, dil ; test if test alert specified
|
|
jz short KiCO20 ; if z, test alert not specified
|
|
call KeTestAlertThread ; test alert for current thread
|
|
|
|
;
|
|
; If the legacy stated is switched, then restore the legacy floating state.
|
|
;
|
|
|
|
KiCO20: cmp byte ptr ThNpxState[rbx],LEGACY_STATE_SWITCH ; check if switched
|
|
jne short KiCO30 ; if ne, legacy state not switched
|
|
mov di, LfControlWord[rsi] ; save current control word
|
|
mov word ptr LfControlWord[rsi], 03fh ; set to mask all exceptions
|
|
frstord [rsi] ; restore legacy floating state
|
|
mov LfControlWord[rsi], di ; restore control word
|
|
fldcw word ptr LfControlWord[rsi] ; load legacy control word
|
|
KiCO30: jmp KiExceptionExit ;
|
|
|
|
;
|
|
; Context record is misaligned or not accessible.
|
|
;
|
|
|
|
KiCO40: RESTORE_EXCEPTION_STATE ; restore exception state/deallocate
|
|
|
|
ret ; return
|
|
|
|
NESTED_END NtContinue, _TEXT$00
|
|
|
|
subttl "Raise Exception System Service"
|
|
;++
|
|
;
|
|
; NTSTATUS
|
|
; NtRaiseException (
|
|
; IN PEXCEPTION_RECORD ExceptionRecord,
|
|
; IN PCONTEXT ContextRecord,
|
|
; IN BOOLEAN FirstChance
|
|
; )
|
|
;
|
|
; Routine Description:
|
|
;
|
|
; This routine is called as a system service to raise an exception. Its
|
|
; function is to transfer information from the specified context record
|
|
; into the trap frame that was built when the system service was executed.
|
|
; The exception may be raised as a first or second chance exception.
|
|
;
|
|
; Arguments:
|
|
;
|
|
; ExceptionRecord (rcx) - Supplies a pointer to an exception record.
|
|
;
|
|
; ContextRecord (rdx) - Suppilies a pointer to a context record.
|
|
;
|
|
; FirstChance (r8b) - Supplies a boolean value that specifies whether
|
|
; this is the first (TRUE) or second chance (FALSE) for dispatching
|
|
; the exception.
|
|
;
|
|
; Implicit Arguments:
|
|
;
|
|
; rbp - Supplies a pointer to a trap frame.
|
|
;
|
|
; Return Value:
|
|
;
|
|
; Normally there is no return from this routine. However, if the specified
|
|
; context record or exception record is misaligned or is not accessible,
|
|
; then the appropriate status code is returned.
|
|
;
|
|
;--
|
|
|
|
NESTED_ENTRY NtRaiseException, _TEXT$00
|
|
|
|
GENERATE_EXCEPTION_FRAME ; generate exception frame
|
|
|
|
;
|
|
; Call the raise exception kernel routine which will marshall the arguments
|
|
; and then call the exception dispatcher.
|
|
;
|
|
|
|
mov rbx, gs:[PcCurrentThread] ; get current thread address
|
|
cmp byte ptr ThNpxState[rbx],LEGACY_STATE_SWITCH ; check if switched
|
|
jne short KiRE10 ; if ne, legacy state not switched
|
|
|
|
;
|
|
; N.B. The legacy floating point state must be saved and restored since saving
|
|
; the state initializes some of the state.
|
|
;
|
|
; N.B. Interrupts must also be disabled during this sequence to ensure that a
|
|
; get context APC interrupt does not occur.
|
|
;
|
|
|
|
lea rsi, (KTRAP_FRAME_LENGTH - 128)[rbp] ; get legacy save address
|
|
cli ; disable interrupts
|
|
fnsaved [rsi] ; save legacy floating state
|
|
mov di, LfControlWord[rsi] ; save current control word
|
|
mov word ptr LfControlWord[rsi], 03fh ; set to mask all exceptions
|
|
frstord [rsi] ; restore legacy floating point state
|
|
mov LfControlWord[rsi], di ; restore control word
|
|
fldcw word ptr LfControlWord[rsi] ; load legacy control word
|
|
sti ; enabel interrupts
|
|
KiRE10: mov ExP5[rsp], r8b ; set first chance parameter
|
|
mov r8, rsp ; set exception frame address
|
|
lea r9, (-128)[rbp] ; set trap frame address
|
|
call KiRaiseException ; call raise exception routine
|
|
|
|
;
|
|
; If the kernel raise exception routine returns success, then exit via the
|
|
; exception exit code. Otherwise, return to the system service dispatcher.
|
|
;
|
|
|
|
test eax, eax ; test if service failed
|
|
jnz short KiRE20 ; if nz, service failed
|
|
|
|
;
|
|
; Exit via the exception exit code which will restore the machine state.
|
|
;
|
|
|
|
mov r8, TrTrapFrame[rbp] ; set previous trap frame address
|
|
mov ThTrapFrame[rbx], r8 ;
|
|
jmp KiExceptionExit ;
|
|
|
|
;
|
|
; The context or exception record is misaligned or not accessible, or the
|
|
; exception was not handled.
|
|
;
|
|
|
|
KiRE20: RESTORE_EXCEPTION_STATE ; restore exception state/deallocate
|
|
|
|
ret ; return
|
|
|
|
NESTED_END NtRaiseException, _TEXT$00
|
|
|
|
end
|