| ;------------------------------------------------------------------------------ | |
| ; | |
| ; Copyright (c) 2010 - 2012, 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. | |
| ; | |
| ; Module Name: | |
| ; | |
| ; PageFaultHandler.asm | |
| ; | |
| ; Abstract: | |
| ; | |
| ; Defines page fault handler used to hook SMM IDT | |
| ; | |
| ;------------------------------------------------------------------------------ | |
| EXTERN mOriginalHandler:QWORD | |
| EXTERN PageFaultHandler:PROC | |
| .code | |
| PageFaultHandlerHook PROC | |
| push rax ; save all volatile registers | |
| push rcx | |
| push rdx | |
| push r8 | |
| push r9 | |
| push r10 | |
| push r11 | |
| add rsp, -10h * 6 - 8 ; reserve memory to store XMM registers and make address 16-byte alignment | |
| movdqa [rsp], 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 | |
| movdqa xmm0, [rsp] | |
| movdqa xmm1, [rsp + 10h] | |
| movdqa xmm2, [rsp + 20h] | |
| movdqa xmm3, [rsp + 30h] | |
| movdqa xmm4, [rsp + 40h] | |
| movdqa xmm5, [rsp + 50h] | |
| add rsp, 10h * 6 + 8 | |
| test al, al ; set ZF flag | |
| pop r11 | |
| pop r10 | |
| pop r9 | |
| pop r8 | |
| pop rdx | |
| pop rcx | |
| pop rax ; restore all volatile registers | |
| jnz @F ; check ZF flag | |
| jmp mOriginalHandler | |
| @@: | |
| add rsp, 08h ; skip error code for PF | |
| iretq | |
| PageFaultHandlerHook ENDP | |
| END |