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56244b92 JJ |
1 | ;------------------------------------------------------------------------------\r |
2 | ;\r | |
0aac2f77 | 3 | ; Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>\r |
9344f092 | 4 | ; SPDX-License-Identifier: BSD-2-Clause-Patent\r |
56244b92 JJ |
5 | ;\r |
6 | ; Module Name:\r | |
7 | ;\r | |
8 | ; LongJump.Asm\r | |
9 | ;\r | |
10 | ; Abstract:\r | |
11 | ;\r | |
12 | ; Implementation of _LongJump() on x64.\r | |
13 | ;\r | |
14 | ;------------------------------------------------------------------------------\r | |
15 | \r | |
0aac2f77 JY |
16 | %include "Nasm.inc"\r |
17 | \r | |
56244b92 JJ |
18 | DEFAULT REL\r |
19 | SECTION .text\r | |
20 | \r | |
0aac2f77 JY |
21 | extern ASM_PFX(PcdGet32 (PcdControlFlowEnforcementPropertyMask))\r |
22 | \r | |
56244b92 JJ |
23 | ;------------------------------------------------------------------------------\r |
24 | ; VOID\r | |
25 | ; EFIAPI\r | |
26 | ; InternalLongJump (\r | |
27 | ; IN BASE_LIBRARY_JUMP_BUFFER *JumpBuffer,\r | |
28 | ; IN UINTN Value\r | |
29 | ; );\r | |
30 | ;------------------------------------------------------------------------------\r | |
31 | global ASM_PFX(InternalLongJump)\r | |
32 | ASM_PFX(InternalLongJump):\r | |
0aac2f77 JY |
33 | \r |
34 | mov eax, [ASM_PFX(PcdGet32 (PcdControlFlowEnforcementPropertyMask))]\r | |
35 | test eax, eax\r | |
36 | jz CetDone\r | |
37 | mov rax, cr4\r | |
38 | bt eax, 23 ; check if CET is enabled\r | |
39 | jnc CetDone\r | |
40 | \r | |
41 | push rdx ; save rdx\r | |
42 | \r | |
43 | mov rdx, [rcx + 0xF8] ; rdx = target SSP\r | |
44 | READSSP_RAX\r | |
45 | sub rdx, rax ; rdx = delta\r | |
46 | mov rax, rdx ; rax = delta\r | |
47 | \r | |
48 | shr rax, 3 ; rax = delta/sizeof(UINT64)\r | |
49 | INCSSP_RAX\r | |
50 | \r | |
51 | pop rdx ; restore rdx\r | |
52 | CetDone:\r | |
53 | \r | |
56244b92 JJ |
54 | mov rbx, [rcx]\r |
55 | mov rsp, [rcx + 8]\r | |
56 | mov rbp, [rcx + 0x10]\r | |
57 | mov rdi, [rcx + 0x18]\r | |
58 | mov rsi, [rcx + 0x20]\r | |
59 | mov r12, [rcx + 0x28]\r | |
60 | mov r13, [rcx + 0x30]\r | |
61 | mov r14, [rcx + 0x38]\r | |
62 | mov r15, [rcx + 0x40]\r | |
63 | ; load non-volatile fp registers\r | |
64 | ldmxcsr [rcx + 0x50]\r | |
65 | movdqu xmm6, [rcx + 0x58]\r | |
66 | movdqu xmm7, [rcx + 0x68]\r | |
67 | movdqu xmm8, [rcx + 0x78]\r | |
68 | movdqu xmm9, [rcx + 0x88]\r | |
69 | movdqu xmm10, [rcx + 0x98]\r | |
70 | movdqu xmm11, [rcx + 0xA8]\r | |
71 | movdqu xmm12, [rcx + 0xB8]\r | |
72 | movdqu xmm13, [rcx + 0xC8]\r | |
73 | movdqu xmm14, [rcx + 0xD8]\r | |
74 | movdqu xmm15, [rcx + 0xE8]\r | |
75 | mov rax, rdx ; set return value\r | |
76 | jmp qword [rcx + 0x48]\r | |
77 | \r |