projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 58dcdada | 1 | ;------------------------------------------------------------------------------\r |
| 2 | ;\r | |
| 8f2a5f80 HT |
3 | ; Copyright (c) 2007, Intel Corporation. All rights reserved.<BR>\r |
| 4 | ; This program and the accompanying materials\r | |
| 58dcdada | 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 | .586p\r | |
| 23 | .model flat,C\r | |
| 24 | .code\r | |
| 25 | \r | |
| 26 | ;------------------------------------------------------------------------------\r | |
| 27 | ; VOID\r | |
| 28 | ; EFIAPI\r | |
| 29 | ; SecSwitchStack (\r | |
| 30 | ; UINT32 TemporaryMemoryBase,\r | |
| 31 | ; UINT32 PermenentMemoryBase\r | |
| 32 | ; );\r | |
| 33 | ;------------------------------------------------------------------------------ \r | |
| 34 | SecSwitchStack PROC\r | |
| 35 | ;\r | |
| 36 | ; Save three register: eax, ebx, ecx\r | |
| 37 | ;\r | |
| 38 | push eax\r | |
| 39 | push ebx\r | |
| 40 | push ecx\r | |
| 41 | push edx\r | |
| 42 | \r | |
| 43 | ;\r | |
| 44 | ; !!CAUTION!! this function address's is pushed into stack after\r | |
| 45 | ; migration of whole temporary memory, so need save it to permenent\r | |
| 46 | ; memory at first!\r | |
| 47 | ;\r | |
| 48 | \r | |
| 49 | mov ebx, [esp + 20] ; Save the first parameter\r | |
| 50 | mov ecx, [esp + 24] ; Save the second parameter\r | |
| 51 | \r | |
| 52 | ;\r | |
| 53 | ; Save this function's return address into permenent memory at first.\r | |
| 54 | ; Then, Fixup the esp point to permenent memory\r | |
| 55 | ;\r | |
| 56 | mov eax, esp\r | |
| 57 | sub eax, ebx\r | |
| 58 | add eax, ecx\r | |
| 59 | mov edx, dword ptr [esp] ; copy pushed register's value to permenent memory\r | |
| 60 | mov dword ptr [eax], edx \r | |
| 61 | mov edx, dword ptr [esp + 4]\r | |
| 62 | mov dword ptr [eax + 4], edx \r | |
| 63 | mov edx, dword ptr [esp + 8]\r | |
| 64 | mov dword ptr [eax + 8], edx \r | |
| 65 | mov edx, dword ptr [esp + 12]\r | |
| 66 | mov dword ptr [eax + 12], edx \r | |
| 67 | mov edx, dword ptr [esp + 16] ; Update this function's return address into permenent memory\r | |
| 68 | mov dword ptr [eax + 16], edx \r | |
| 69 | mov esp, eax ; From now, esp is pointed to permenent memory\r | |
| 70 | \r | |
| 71 | ;\r | |
| 72 | ; Fixup the ebp point to permenent memory\r | |
| 73 | ;\r | |
| 74 | mov eax, ebp\r | |
| 75 | sub eax, ebx\r | |
| 76 | add eax, ecx\r | |
| 77 | mov ebp, eax ; From now, ebp is pointed to permenent memory\r | |
| 78 | \r | |
| 79 | ;\r | |
| 80 | ; Fixup callee's ebp point for PeiDispatch\r | |
| 81 | ;\r | |
| 82 | mov eax, dword ptr [ebp]\r | |
| 83 | sub eax, ebx\r | |
| 84 | add eax, ecx\r | |
| 85 | mov dword ptr [ebp], eax ; From now, Temporary's PPI caller's stack is in permenent memory\r | |
| 86 | \r | |
| 87 | pop edx\r | |
| 88 | pop ecx\r | |
| 89 | pop ebx\r | |
| 90 | pop eax\r | |
| 91 | ret\r | |
| 92 | SecSwitchStack ENDP\r | |
| 93 | \r | |
| 94 | END\r |