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Commit | Line | Data |
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3eb69b08 JY |
1 | ;------------------------------------------------------------------------------ ;\r |
2 | ; Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>\r | |
0acd8697 | 3 | ; SPDX-License-Identifier: BSD-2-Clause-Patent\r |
3eb69b08 JY |
4 | ;\r |
5 | ;-------------------------------------------------------------------------------\r | |
6 | \r | |
7 | %include "Nasm.inc"\r | |
8 | \r | |
9 | DEFAULT REL\r | |
10 | SECTION .text\r | |
11 | \r | |
12 | global ASM_PFX(DisableCet)\r | |
13 | ASM_PFX(DisableCet):\r | |
14 | \r | |
15 | ; Skip the pushed data for call\r | |
16 | mov rax, 1\r | |
17 | INCSSP_RAX\r | |
18 | \r | |
19 | mov rax, cr4\r | |
20 | btr eax, 23 ; clear CET\r | |
21 | mov cr4, rax\r | |
22 | ret\r | |
23 | \r | |
24 | global ASM_PFX(EnableCet)\r | |
25 | ASM_PFX(EnableCet):\r | |
26 | \r | |
27 | mov rax, cr4\r | |
28 | bts eax, 23 ; set CET\r | |
29 | mov cr4, rax\r | |
30 | \r | |
31 | ; use jmp to skip the check for ret\r | |
32 | pop rax\r | |
33 | jmp rax\r | |
34 | \r |