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;; @file
; This is the assembly code for page fault handler hook.
;
; Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
;
; This program and the accompanying materials
; are licensed and made available under the terms and conditions of the BSD License
; which accompanies this distribution. The full text of the license may be found at
; http://opensource.org/licenses/bsd-license.php
;
; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
;
;;
EXTERN PageFaultHandler:PROC
.code
PageFaultHandlerHook PROC
add rsp, -10h
; save rax
mov [rsp + 08h], rax
;push rax ; save all volatile registers
push rcx
push rdx
push r8
push r9
push r10
push r11
; save volatile fp registers
; 68h + 08h(for alignment)
add rsp, -70h
stmxcsr [rsp + 60h]
movdqa [rsp + 0h], xmm0
movdqa [rsp + 10h], xmm1
movdqa [rsp + 20h], xmm2
movdqa [rsp + 30h], xmm3
movdqa [rsp + 40h], xmm4
movdqa [rsp + 50h], xmm5
add rsp, -20h
call PageFaultHandler
add rsp, 20h
; load volatile fp registers
ldmxcsr [rsp + 60h]
movdqa xmm0, [rsp + 0h]
movdqa xmm1, [rsp + 10h]
movdqa xmm2, [rsp + 20h]
movdqa xmm3, [rsp + 30h]
movdqa xmm4, [rsp + 40h]
movdqa xmm5, [rsp + 50h]
add rsp, 70h
pop r11
pop r10
pop r9
pop r8
pop rdx
pop rcx
;pop rax ; restore all volatile registers
add rsp, 10h
; rax returned from PageFaultHandler is NULL or OriginalHandler address
; NULL if the page fault is handled by PageFaultHandler
; OriginalHandler address if the page fault is not handled by PageFaultHandler
test rax, rax
; save OriginalHandler address
mov [rsp - 10h], rax
; restore rax
mov rax, [rsp - 08h]
jz @F
; jump to OriginalHandler
jmp qword ptr [rsp - 10h]
@@:
add rsp, 08h ; skip error code for PF
iretq
PageFaultHandlerHook ENDP
END
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