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1 | ;/** @file\r |
2 | ;\r | |
3 | ; This code provides low level routines that support the Virtual Machine\r | |
4 | ; for option ROMs.\r | |
5 | ;\r | |
6 | ; Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>\r | |
7 | ; This program and the accompanying materials\r | |
8 | ; are licensed and made available under the terms and conditions of the BSD License\r | |
9 | ; which accompanies this distribution. The full text of the license may be found at\r | |
10 | ; http://opensource.org/licenses/bsd-license.php\r | |
11 | ;\r | |
12 | ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
13 | ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
14 | ;\r | |
15 | ;**/\r | |
16 | \r | |
17 | ;---------------------------------------------------------------------------\r | |
18 | ; Equate files needed.\r | |
19 | ;---------------------------------------------------------------------------\r | |
20 | \r | |
21 | ;---------------------------------------------------------------------------\r | |
22 | ; Assembler options\r | |
23 | ;---------------------------------------------------------------------------\r | |
24 | \r | |
25 | SECTION .text\r | |
26 | extern ASM_PFX(CopyMem)\r | |
27 | extern ASM_PFX(EbcInterpret)\r | |
28 | extern ASM_PFX(ExecuteEbcImageEntryPoint)\r | |
29 | \r | |
30 | ;****************************************************************************\r | |
31 | ; EbcLLCALLEXNative\r | |
32 | ;\r | |
33 | ; This function is called to execute an EBC CALLEX instruction\r | |
34 | ; to native code.\r | |
35 | ; This instruction requires that we thunk out to external native\r | |
36 | ; code. For IA32, we simply switch stacks and jump to the\r | |
37 | ; specified function. On return, we restore the stack pointer\r | |
38 | ; to its original location.\r | |
39 | ;\r | |
40 | ; Destroys no working registers.\r | |
41 | ;****************************************************************************\r | |
42 | ; INT64 EbcLLCALLEXNative(UINTN FuncAddr, UINTN NewStackPointer, VOID *FramePtr)\r | |
43 | global ASM_PFX(EbcLLCALLEXNative)\r | |
44 | ASM_PFX(EbcLLCALLEXNative):\r | |
45 | push ebp\r | |
46 | push ebx\r | |
47 | mov ebp, esp ; standard function prolog\r | |
48 | \r | |
49 | ; Get function address in a register\r | |
50 | ; mov ecx, FuncAddr => mov ecx, dword ptr [FuncAddr]\r | |
51 | mov ecx, dword [esp + 0xC]\r | |
52 | \r | |
53 | ; Set stack pointer to new value\r | |
54 | ; mov eax, NewStackPointer => mov eax, dword ptr [NewSp]\r | |
55 | mov eax, dword [esp + 0x14]\r | |
56 | mov edx, dword [esp + 0x10]\r | |
57 | sub eax, edx\r | |
58 | sub esp, eax\r | |
59 | mov ebx, esp\r | |
60 | push ecx\r | |
61 | push eax\r | |
62 | push edx\r | |
63 | push ebx\r | |
64 | call ASM_PFX(CopyMem)\r | |
65 | pop eax\r | |
66 | pop eax\r | |
67 | pop eax\r | |
68 | pop ecx\r | |
69 | \r | |
70 | ; Now call the external routine\r | |
71 | call ecx\r | |
72 | \r | |
73 | ; ebp is preserved by the callee. In this function it\r | |
74 | ; equals the original esp, so set them equal\r | |
75 | mov esp, ebp\r | |
76 | \r | |
77 | ; Standard function epilog\r | |
78 | mov esp, ebp\r | |
79 | pop ebx\r | |
80 | pop ebp\r | |
81 | ret\r | |
82 | \r | |
83 | ;****************************************************************************\r | |
84 | ; EbcLLEbcInterpret\r | |
85 | ;\r | |
86 | ; Begin executing an EBC image.\r | |
87 | ;****************************************************************************\r | |
88 | ; UINT64 EbcLLEbcInterpret(VOID)\r | |
89 | global ASM_PFX(EbcLLEbcInterpret)\r | |
90 | ASM_PFX(EbcLLEbcInterpret):\r | |
91 | ;\r | |
92 | ;; mov eax, 0xca112ebc\r | |
93 | ;; mov eax, EbcEntryPoint\r | |
94 | ;; mov ecx, EbcLLEbcInterpret\r | |
95 | ;; jmp ecx\r | |
96 | ;\r | |
97 | ; Caller uses above instruction to jump here\r | |
98 | ; The stack is below:\r | |
99 | ; +-----------+\r | |
100 | ; | RetAddr |\r | |
101 | ; +-----------+\r | |
102 | ; |EntryPoint | (EAX)\r | |
103 | ; +-----------+\r | |
104 | ; | Arg1 | <- EDI\r | |
105 | ; +-----------+\r | |
106 | ; | Arg2 |\r | |
107 | ; +-----------+\r | |
108 | ; | ... |\r | |
109 | ; +-----------+\r | |
110 | ; | Arg16 |\r | |
111 | ; +-----------+\r | |
112 | ; | EDI |\r | |
113 | ; +-----------+\r | |
114 | ; | ESI |\r | |
115 | ; +-----------+\r | |
116 | ; | EBP | <- EBP\r | |
117 | ; +-----------+\r | |
118 | ; | RetAddr | <- ESP is here\r | |
119 | ; +-----------+\r | |
120 | ; | Arg1 | <- ESI\r | |
121 | ; +-----------+\r | |
122 | ; | Arg2 |\r | |
123 | ; +-----------+\r | |
124 | ; | ... |\r | |
125 | ; +-----------+\r | |
126 | ; | Arg16 |\r | |
127 | ; +-----------+\r | |
128 | ;\r | |
129 | \r | |
130 | ; Construct new stack\r | |
131 | push ebp\r | |
132 | mov ebp, esp\r | |
133 | push esi\r | |
134 | push edi\r | |
135 | sub esp, 0x40\r | |
136 | push eax\r | |
137 | mov esi, ebp\r | |
138 | add esi, 8\r | |
139 | mov edi, esp\r | |
140 | add edi, 4\r | |
141 | mov ecx, 16\r | |
142 | rep movsd\r | |
143 | \r | |
144 | ; call C-code\r | |
145 | call ASM_PFX(EbcInterpret)\r | |
146 | add esp, 0x44\r | |
147 | pop edi\r | |
148 | pop esi\r | |
149 | pop ebp\r | |
150 | ret\r | |
151 | \r | |
152 | ;****************************************************************************\r | |
153 | ; EbcLLExecuteEbcImageEntryPoint\r | |
154 | ;\r | |
155 | ; Begin executing an EBC image.\r | |
156 | ;****************************************************************************\r | |
157 | ; UINT64 EbcLLExecuteEbcImageEntryPoint(VOID)\r | |
158 | global ASM_PFX(EbcLLExecuteEbcImageEntryPoint)\r | |
159 | ASM_PFX(EbcLLExecuteEbcImageEntryPoint):\r | |
160 | ;\r | |
161 | ;; mov eax, 0xca112ebc\r | |
162 | ;; mov eax, EbcEntryPoint\r | |
163 | ;; mov ecx, EbcLLExecuteEbcImageEntryPoint\r | |
164 | ;; jmp ecx\r | |
165 | ;\r | |
166 | ; Caller uses above instruction to jump here\r | |
167 | ; The stack is below:\r | |
168 | ; +-----------+\r | |
169 | ; | RetAddr |\r | |
170 | ; +-----------+\r | |
171 | ; |EntryPoint | (EAX)\r | |
172 | ; +-----------+\r | |
173 | ; |ImageHandle|\r | |
174 | ; +-----------+\r | |
175 | ; |SystemTable|\r | |
176 | ; +-----------+\r | |
177 | ; | RetAddr | <- ESP is here\r | |
178 | ; +-----------+\r | |
179 | ; |ImageHandle|\r | |
180 | ; +-----------+\r | |
181 | ; |SystemTable|\r | |
182 | ; +-----------+\r | |
183 | ;\r | |
184 | \r | |
185 | ; Construct new stack\r | |
186 | mov [esp - 0xC], eax\r | |
187 | mov eax, [esp + 0x4]\r | |
188 | mov [esp - 0x8], eax\r | |
189 | mov eax, [esp + 0x8]\r | |
190 | mov [esp - 0x4], eax\r | |
191 | \r | |
192 | ; call C-code\r | |
193 | sub esp, 0xC\r | |
194 | call ASM_PFX(ExecuteEbcImageEntryPoint)\r | |
195 | add esp, 0xC\r | |
196 | ret\r | |
197 | \r |