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1 | ;; @file\r | |
2 | ; This is the assembly code for page fault handler hook.\r | |
3 | ;\r | |
4 | ; Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>\r | |
5 | ;\r | |
6 | ; This program and the accompanying materials\r | |
7 | ; are licensed and made available under the terms and conditions of the BSD License\r | |
8 | ; which accompanies this distribution. The full text of the license may be found at\r | |
9 | ; http://opensource.org/licenses/bsd-license.php\r | |
10 | ;\r | |
11 | ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
12 | ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
13 | ;\r | |
14 | ;;\r | |
15 | \r | |
16 | extern ASM_PFX(PageFaultHandler)\r | |
17 | \r | |
18 | DEFAULT REL\r | |
19 | SECTION .text\r | |
20 | \r | |
21 | global ASM_PFX(PageFaultHandlerHook)\r | |
22 | ASM_PFX(PageFaultHandlerHook):\r | |
23 | add rsp, -0x10\r | |
24 | ; save rax\r | |
25 | mov [rsp + 0x8], rax\r | |
26 | \r | |
27 | ;push rax ; save all volatile registers\r | |
28 | push rcx\r | |
29 | push rdx\r | |
30 | push r8\r | |
31 | push r9\r | |
32 | push r10\r | |
33 | push r11\r | |
34 | ; save volatile fp registers\r | |
35 | ; 68h + 08h(for alignment)\r | |
36 | add rsp, -0x70\r | |
37 | stmxcsr [rsp + 0x60]\r | |
38 | movdqa [rsp + 0x0], xmm0\r | |
39 | movdqa [rsp + 0x10], xmm1\r | |
40 | movdqa [rsp + 0x20], xmm2\r | |
41 | movdqa [rsp + 0x30], xmm3\r | |
42 | movdqa [rsp + 0x40], xmm4\r | |
43 | movdqa [rsp + 0x50], xmm5\r | |
44 | \r | |
45 | add rsp, -0x20\r | |
46 | call ASM_PFX(PageFaultHandler)\r | |
47 | add rsp, 0x20\r | |
48 | \r | |
49 | ; load volatile fp registers\r | |
50 | ldmxcsr [rsp + 0x60]\r | |
51 | movdqa xmm0, [rsp + 0x0]\r | |
52 | movdqa xmm1, [rsp + 0x10]\r | |
53 | movdqa xmm2, [rsp + 0x20]\r | |
54 | movdqa xmm3, [rsp + 0x30]\r | |
55 | movdqa xmm4, [rsp + 0x40]\r | |
56 | movdqa xmm5, [rsp + 0x50]\r | |
57 | add rsp, 0x70\r | |
58 | \r | |
59 | pop r11\r | |
60 | pop r10\r | |
61 | pop r9\r | |
62 | pop r8\r | |
63 | pop rdx\r | |
64 | pop rcx\r | |
65 | ;pop rax ; restore all volatile registers\r | |
66 | \r | |
67 | add rsp, 0x10\r | |
68 | \r | |
69 | ; rax returned from PageFaultHandler is NULL or OriginalHandler address\r | |
70 | ; NULL if the page fault is handled by PageFaultHandler\r | |
71 | ; OriginalHandler address if the page fault is not handled by PageFaultHandler\r | |
72 | test rax, rax\r | |
73 | \r | |
74 | ; save OriginalHandler address\r | |
75 | mov [rsp - 0x10], rax\r | |
76 | ; restore rax\r | |
77 | mov rax, [rsp - 0x8]\r | |
78 | \r | |
79 | jz .0\r | |
80 | \r | |
81 | ; jump to OriginalHandler\r | |
82 | jmp qword [rsp - 0x10]\r | |
83 | \r | |
84 | .0:\r | |
85 | add rsp, 0x8 ; skip error code for PF\r | |
86 | iretq\r | |
87 | \r |