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f66a43b2 JM |
1 | ;------------------------------------------------------------------------------\r |
2 | ;\r | |
3 | ; Copyright (c) 2013, Intel Corporation. All rights reserved.<BR>\r | |
4 | ; This program and the accompanying materials\r | |
5 | ; are licensed and made available under the terms and conditions of the BSD License\r | |
6 | ; which accompanies this distribution. The full text of the license may be found at\r | |
7 | ; http://opensource.org/licenses/bsd-license.php\r | |
8 | ;\r | |
9 | ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
10 | ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
11 | ;\r | |
12 | ; Module Name:\r | |
13 | ;\r | |
14 | ; Stack.asm\r | |
15 | ;\r | |
16 | ; Abstract:\r | |
17 | ;\r | |
18 | ; Switch the stack from temporary memory to permenent memory.\r | |
19 | ;\r | |
20 | ;------------------------------------------------------------------------------\r | |
21 | \r | |
22 | .code\r | |
23 | \r | |
24 | ;------------------------------------------------------------------------------\r | |
25 | ; VOID\r | |
26 | ; EFIAPI\r | |
27 | ; SecSwitchStack (\r | |
28 | ; UINT32 TemporaryMemoryBase,\r | |
29 | ; UINT32 PermenentMemoryBase\r | |
30 | ; );\r | |
31 | ;------------------------------------------------------------------------------ \r | |
32 | SecSwitchStack PROC\r | |
33 | mov [rsp + 08h], rcx\r | |
34 | mov [rsp + 10h], rdx\r | |
35 | \r | |
36 | ;\r | |
37 | ; Save three register: eax, ebx, ecx\r | |
38 | ;\r | |
39 | push rax\r | |
40 | push rbx\r | |
41 | push rcx\r | |
42 | push rdx\r | |
43 | \r | |
44 | ;\r | |
45 | ; !!CAUTION!! this function address's is pushed into stack after\r | |
46 | ; migration of whole temporary memory, so need save it to permenent\r | |
47 | ; memory at first!\r | |
48 | ;\r | |
49 | \r | |
50 | mov rbx, [rsp + 28h] ; Save the first parameter\r | |
51 | mov rcx, [rsp + 30h] ; Save the second parameter\r | |
52 | \r | |
53 | ;\r | |
54 | ; Save this function's return address into permenent memory at first.\r | |
55 | ; Then, Fixup the esp point to permenent memory\r | |
56 | ;\r | |
57 | mov rax, rsp\r | |
58 | sub rax, rbx\r | |
59 | add rax, rcx\r | |
60 | mov rdx, qword ptr [rsp] ; copy pushed register's value to permenent memory\r | |
61 | mov qword ptr [rax], rdx \r | |
62 | mov rdx, qword ptr [rsp + 8]\r | |
63 | mov qword ptr [rax + 8], rdx \r | |
64 | mov rdx, qword ptr [rsp + 10h]\r | |
65 | mov qword ptr [rax + 10h], rdx \r | |
66 | mov rdx, qword ptr [rsp + 18h]\r | |
67 | mov qword ptr [rax + 18h], rdx \r | |
68 | mov rdx, qword ptr [rsp + 20h] ; Update this function's return address into permenent memory\r | |
69 | mov qword ptr [rax + 20h], rdx \r | |
70 | mov rsp, rax ; From now, esp is pointed to permenent memory\r | |
71 | \r | |
72 | ;\r | |
73 | ; Fixup the ebp point to permenent memory\r | |
74 | ;\r | |
75 | mov rax, rbp\r | |
76 | sub rax, rbx\r | |
77 | add rax, rcx\r | |
78 | mov rbp, rax ; From now, ebp is pointed to permenent memory\r | |
79 | \r | |
80 | pop rdx\r | |
81 | pop rcx\r | |
82 | pop rbx\r | |
83 | pop rax\r | |
84 | ret\r | |
85 | SecSwitchStack ENDP\r | |
86 | \r | |
87 | ;------------------------------------------------------------------------------\r | |
88 | ; VOID\r | |
89 | ; EFIAPI\r | |
90 | ; PeiSwitchStacks (\r | |
91 | ; IN SWITCH_STACK_ENTRY_POINT EntryPoint,\r | |
92 | ; IN VOID *Context1, OPTIONAL\r | |
93 | ; IN VOID *Context2, OPTIONAL\r | |
94 | ; IN VOID *Context3, OPTIONAL\r | |
95 | ; IN VOID *NewStack\r | |
96 | ; )\r | |
97 | ;------------------------------------------------------------------------------\r | |
98 | PeiSwitchStacks PROC\r | |
99 | mov rax, rcx\r | |
100 | mov rcx, rdx\r | |
101 | mov rdx, r8\r | |
102 | mov r8, r9\r | |
103 | mov rsp, [rsp + 28h]\r | |
104 | sub rsp, 20h\r | |
105 | call rax\r | |
106 | jmp $\r | |
107 | ret\r | |
108 | PeiSwitchStacks ENDP\r | |
109 | \r | |
110 | END\r |