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ff443d3e | 1 | ;------------------------------------------------------------------------------ |
2 | ; | |
53c76a64 | 3 | ; Copyright (c) 2010 - 2012, Intel Corporation. All rights reserved.<BR> |
584d5652 | 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 | |
53c76a64 | 35 | |
36 | add rsp, -10h * 6 - 8 ; reserve memory to store XMM registers and make address 16-byte alignment | |
37 | movdqa [rsp], xmm0 | |
38 | movdqa [rsp + 10h], xmm1 | |
39 | movdqa [rsp + 20h], xmm2 | |
40 | movdqa [rsp + 30h], xmm3 | |
41 | movdqa [rsp + 40h], xmm4 | |
42 | movdqa [rsp + 50h], xmm5 | |
43 | ||
ff443d3e | 44 | add rsp, -20h |
45 | call PageFaultHandler | |
46 | add rsp, 20h | |
53c76a64 | 47 | |
48 | movdqa xmm0, [rsp] | |
49 | movdqa xmm1, [rsp + 10h] | |
50 | movdqa xmm2, [rsp + 20h] | |
51 | movdqa xmm3, [rsp + 30h] | |
52 | movdqa xmm4, [rsp + 40h] | |
53 | movdqa xmm5, [rsp + 50h] | |
54 | add rsp, 10h * 6 + 8 | |
55 | ||
56 | test al, al ; set ZF flag | |
ff443d3e | 57 | pop r11 |
58 | pop r10 | |
59 | pop r9 | |
60 | pop r8 | |
61 | pop rdx | |
62 | pop rcx | |
63 | pop rax ; restore all volatile registers | |
53c76a64 | 64 | jnz @F ; check ZF flag |
ff443d3e | 65 | jmp mOriginalHandler |
66 | @@: | |
67 | add rsp, 08h ; skip error code for PF | |
68 | iretq | |
69 | PageFaultHandlerHook ENDP | |
6a60f8cb | 70 | END |