projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| ff443d3e | 1 | ;------------------------------------------------------------------------------ |
| 2 | ; | |
| 584d5652 HT |
3 | ; Copyright (c) 2010, Intel Corporation. All rights reserved.<BR> |
| 4 | ; This program and the accompanying materials | |
| ff443d3e | 5 | ; are licensed and made available under the terms and conditions of the BSD License |
| 6 | ; which accompanies this distribution. The full text of the license may be found at | |
| 7 | ; http://opensource.org/licenses/bsd-license.php | |
| 8 | ; | |
| 9 | ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
| 10 | ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
| 11 | ; | |
| 12 | ; Module Name: | |
| 13 | ; | |
| 14 | ; PageFaultHandler.asm | |
| 15 | ; | |
| 16 | ; Abstract: | |
| 17 | ; | |
| 18 | ; Defines page fault handler used to hook SMM IDT | |
| 19 | ; | |
| 20 | ;------------------------------------------------------------------------------ | |
| 21 | ||
| 6a60f8cb | 22 | EXTERN mOriginalHandler:QWORD |
| 23 | EXTERN PageFaultHandler:PROC | |
| ff443d3e | 24 | |
| 25 | .code | |
| 26 | ||
| 27 | PageFaultHandlerHook PROC | |
| 28 | push rax ; save all volatile registers | |
| 29 | push rcx | |
| 30 | push rdx | |
| 31 | push r8 | |
| 32 | push r9 | |
| 33 | push r10 | |
| 34 | push r11 | |
| 35 | add rsp, -20h | |
| 36 | call PageFaultHandler | |
| 37 | add rsp, 20h | |
| 38 | test rax, rax | |
| 39 | pop r11 | |
| 40 | pop r10 | |
| 41 | pop r9 | |
| 42 | pop r8 | |
| 43 | pop rdx | |
| 44 | pop rcx | |
| 45 | pop rax ; restore all volatile registers | |
| 46 | jnz @F | |
| 47 | jmp mOriginalHandler | |
| 48 | @@: | |
| 49 | add rsp, 08h ; skip error code for PF | |
| 50 | iretq | |
| 51 | PageFaultHandlerHook ENDP | |
| 6a60f8cb | 52 | END |