]>
Commit | Line | Data |
---|---|---|
72ed2ede 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 |
72ed2ede JJ |
5 | ;\r |
6 | ; Module Name:\r | |
7 | ;\r | |
8 | ; SetJump.Asm\r | |
9 | ;\r | |
10 | ; Abstract:\r | |
11 | ;\r | |
12 | ; Implementation of SetJump() on IA-32.\r | |
13 | ;\r | |
14 | ;------------------------------------------------------------------------------\r | |
15 | \r | |
0aac2f77 JY |
16 | %include "Nasm.inc"\r |
17 | \r | |
72ed2ede JJ |
18 | SECTION .text\r |
19 | \r | |
20 | extern ASM_PFX(InternalAssertJumpBuffer)\r | |
0aac2f77 | 21 | extern ASM_PFX(PcdGet32 (PcdControlFlowEnforcementPropertyMask))\r |
72ed2ede JJ |
22 | \r |
23 | ;------------------------------------------------------------------------------\r | |
24 | ; UINTN\r | |
25 | ; EFIAPI\r | |
26 | ; SetJump (\r | |
27 | ; OUT BASE_LIBRARY_JUMP_BUFFER *JumpBuffer\r | |
28 | ; );\r | |
29 | ;------------------------------------------------------------------------------\r | |
30 | global ASM_PFX(SetJump)\r | |
31 | ASM_PFX(SetJump):\r | |
32 | push DWORD [esp + 4]\r | |
33 | call ASM_PFX(InternalAssertJumpBuffer) ; To validate JumpBuffer\r | |
34 | pop ecx\r | |
35 | pop ecx ; ecx <- return address\r | |
36 | mov edx, [esp]\r | |
0aac2f77 JY |
37 | \r |
38 | xor eax, eax\r | |
39 | mov [edx + 24], eax ; save 0 to SSP\r | |
40 | \r | |
41 | mov eax, [ASM_PFX(PcdGet32 (PcdControlFlowEnforcementPropertyMask))]\r | |
42 | test eax, eax\r | |
43 | jz CetDone\r | |
44 | mov eax, cr4\r | |
45 | bt eax, 23 ; check if CET is enabled\r | |
46 | jnc CetDone\r | |
47 | \r | |
48 | mov eax, 1\r | |
49 | INCSSP_EAX ; to read original SSP\r | |
50 | READSSP_EAX\r | |
51 | mov [edx + 0x24], eax ; save SSP\r | |
52 | \r | |
53 | CetDone:\r | |
54 | \r | |
72ed2ede JJ |
55 | mov [edx], ebx\r |
56 | mov [edx + 4], esi\r | |
57 | mov [edx + 8], edi\r | |
58 | mov [edx + 12], ebp\r | |
59 | mov [edx + 16], esp\r | |
60 | mov [edx + 20], ecx ; eip value to restore in LongJump\r | |
61 | xor eax, eax\r | |
62 | jmp ecx\r | |
63 | \r |