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Commit | Line | Data |
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e148512e | 1 | ;------------------------------------------------------------------------------\r |
2 | ;\r | |
3 | ; Copyright (c) 2007 - 2012, Intel Corporation. All rights reserved.<BR>\r | |
e3ba31da | 4 | ; SPDX-License-Identifier: BSD-2-Clause-Patent\r |
e148512e | 5 | ;\r |
6 | ; Module Name:\r | |
7 | ;\r | |
8 | ; Stack.asm\r | |
9 | ;\r | |
10 | ; Abstract:\r | |
11 | ;\r | |
de949fdb | 12 | ; Switch the stack from temporary memory to permanent memory.\r |
e148512e | 13 | ;\r |
14 | ;------------------------------------------------------------------------------\r | |
15 | \r | |
16 | .586p\r | |
17 | .model flat,C\r | |
18 | .code\r | |
79e4f2a5 | 19 | \r |
e148512e | 20 | ;------------------------------------------------------------------------------\r |
21 | ; VOID\r | |
22 | ; EFIAPI\r | |
23 | ; SecSwitchStack (\r | |
24 | ; UINT32 TemporaryMemoryBase,\r | |
25 | ; UINT32 PermenentMemoryBase\r | |
26 | ; );\r | |
79e4f2a5 | 27 | ;------------------------------------------------------------------------------\r |
e148512e | 28 | SecSwitchStack PROC\r |
29 | ;\r | |
30 | ; Save three register: eax, ebx, ecx\r | |
31 | ;\r | |
32 | push eax\r | |
33 | push ebx\r | |
34 | push ecx\r | |
35 | push edx\r | |
79e4f2a5 | 36 | \r |
e148512e | 37 | ;\r |
38 | ; !!CAUTION!! this function address's is pushed into stack after\r | |
de949fdb | 39 | ; migration of whole temporary memory, so need save it to permanent\r |
e148512e | 40 | ; memory at first!\r |
41 | ;\r | |
79e4f2a5 | 42 | \r |
e148512e | 43 | mov ebx, [esp + 20] ; Save the first parameter\r |
44 | mov ecx, [esp + 24] ; Save the second parameter\r | |
79e4f2a5 | 45 | \r |
e148512e | 46 | ;\r |
de949fdb AC |
47 | ; Save this function's return address into permanent memory at first.\r |
48 | ; Then, Fixup the esp point to permanent memory\r | |
e148512e | 49 | ;\r |
50 | mov eax, esp\r | |
51 | sub eax, ebx\r | |
52 | add eax, ecx\r | |
de949fdb | 53 | mov edx, dword ptr [esp] ; copy pushed register's value to permanent memory\r |
79e4f2a5 | 54 | mov dword ptr [eax], edx\r |
e148512e | 55 | mov edx, dword ptr [esp + 4]\r |
79e4f2a5 | 56 | mov dword ptr [eax + 4], edx\r |
e148512e | 57 | mov edx, dword ptr [esp + 8]\r |
79e4f2a5 | 58 | mov dword ptr [eax + 8], edx\r |
e148512e | 59 | mov edx, dword ptr [esp + 12]\r |
79e4f2a5 | 60 | mov dword ptr [eax + 12], edx\r |
de949fdb | 61 | mov edx, dword ptr [esp + 16] ; Update this function's return address into permanent memory\r |
79e4f2a5 | 62 | mov dword ptr [eax + 16], edx\r |
de949fdb | 63 | mov esp, eax ; From now, esp is pointed to permanent memory\r |
79e4f2a5 | 64 | \r |
e148512e | 65 | ;\r |
de949fdb | 66 | ; Fixup the ebp point to permanent memory\r |
e148512e | 67 | ;\r |
68 | mov eax, ebp\r | |
69 | sub eax, ebx\r | |
70 | add eax, ecx\r | |
de949fdb | 71 | mov ebp, eax ; From now, ebp is pointed to permanent memory\r |
79e4f2a5 | 72 | \r |
e148512e | 73 | ;\r |
74 | ; Fixup callee's ebp point for PeiDispatch\r | |
75 | ;\r | |
76 | mov eax, dword ptr [ebp]\r | |
77 | sub eax, ebx\r | |
78 | add eax, ecx\r | |
de949fdb | 79 | mov dword ptr [ebp], eax ; From now, Temporary's PPI caller's stack is in permanent memory\r |
79e4f2a5 | 80 | \r |
e148512e | 81 | pop edx\r |
82 | pop ecx\r | |
83 | pop ebx\r | |
84 | pop eax\r | |
85 | ret\r | |
86 | SecSwitchStack ENDP\r | |
87 | \r | |
88 | END\r |