projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| f66a43b2 JM |
1 | ;------------------------------------------------------------------------------\r |
| 2 | ;\r | |
| 3 | ; Copyright (c) 2013, Intel Corporation. All rights reserved.<BR>\r | |
| 9d2eedba | 4 | ; SPDX-License-Identifier: BSD-2-Clause-Patent\r |
| f66a43b2 JM |
5 | ;\r |
| 6 | ; Module Name:\r | |
| 7 | ;\r | |
| 8 | ; Stack.asm\r | |
| 9 | ;\r | |
| 10 | ; Abstract:\r | |
| 11 | ;\r | |
| 12 | ; Switch the stack from temporary memory to permenent memory.\r | |
| 13 | ;\r | |
| 14 | ;------------------------------------------------------------------------------\r | |
| 15 | \r | |
| 16 | .code\r | |
| 17 | \r | |
| 18 | ;------------------------------------------------------------------------------\r | |
| 19 | ; VOID\r | |
| 20 | ; EFIAPI\r | |
| 21 | ; SecSwitchStack (\r | |
| 22 | ; UINT32 TemporaryMemoryBase,\r | |
| 23 | ; UINT32 PermenentMemoryBase\r | |
| 24 | ; );\r | |
| 25 | ;------------------------------------------------------------------------------ \r | |
| 26 | SecSwitchStack PROC\r | |
| 27 | mov [rsp + 08h], rcx\r | |
| 28 | mov [rsp + 10h], rdx\r | |
| 29 | \r | |
| 30 | ;\r | |
| 31 | ; Save three register: eax, ebx, ecx\r | |
| 32 | ;\r | |
| 33 | push rax\r | |
| 34 | push rbx\r | |
| 35 | push rcx\r | |
| 36 | push rdx\r | |
| 37 | \r | |
| 38 | ;\r | |
| 39 | ; !!CAUTION!! this function address's is pushed into stack after\r | |
| 40 | ; migration of whole temporary memory, so need save it to permenent\r | |
| 41 | ; memory at first!\r | |
| 42 | ;\r | |
| 43 | \r | |
| 44 | mov rbx, [rsp + 28h] ; Save the first parameter\r | |
| 45 | mov rcx, [rsp + 30h] ; Save the second parameter\r | |
| 46 | \r | |
| 47 | ;\r | |
| 48 | ; Save this function's return address into permenent memory at first.\r | |
| 49 | ; Then, Fixup the esp point to permenent memory\r | |
| 50 | ;\r | |
| 51 | mov rax, rsp\r | |
| 52 | sub rax, rbx\r | |
| 53 | add rax, rcx\r | |
| 54 | mov rdx, qword ptr [rsp] ; copy pushed register's value to permenent memory\r | |
| 55 | mov qword ptr [rax], rdx \r | |
| 56 | mov rdx, qword ptr [rsp + 8]\r | |
| 57 | mov qword ptr [rax + 8], rdx \r | |
| 58 | mov rdx, qword ptr [rsp + 10h]\r | |
| 59 | mov qword ptr [rax + 10h], rdx \r | |
| 60 | mov rdx, qword ptr [rsp + 18h]\r | |
| 61 | mov qword ptr [rax + 18h], rdx \r | |
| 62 | mov rdx, qword ptr [rsp + 20h] ; Update this function's return address into permenent memory\r | |
| 63 | mov qword ptr [rax + 20h], rdx \r | |
| 64 | mov rsp, rax ; From now, esp is pointed to permenent memory\r | |
| 65 | \r | |
| 66 | ;\r | |
| 67 | ; Fixup the ebp point to permenent memory\r | |
| 68 | ;\r | |
| 69 | mov rax, rbp\r | |
| 70 | sub rax, rbx\r | |
| 71 | add rax, rcx\r | |
| 72 | mov rbp, rax ; From now, ebp is pointed to permenent memory\r | |
| 73 | \r | |
| 74 | pop rdx\r | |
| 75 | pop rcx\r | |
| 76 | pop rbx\r | |
| 77 | pop rax\r | |
| 78 | ret\r | |
| 79 | SecSwitchStack ENDP\r | |
| 80 | \r | |
| 81 | ;------------------------------------------------------------------------------\r | |
| 82 | ; VOID\r | |
| 83 | ; EFIAPI\r | |
| 84 | ; PeiSwitchStacks (\r | |
| 85 | ; IN SWITCH_STACK_ENTRY_POINT EntryPoint,\r | |
| 86 | ; IN VOID *Context1, OPTIONAL\r | |
| 87 | ; IN VOID *Context2, OPTIONAL\r | |
| 88 | ; IN VOID *Context3, OPTIONAL\r | |
| 89 | ; IN VOID *NewStack\r | |
| 90 | ; )\r | |
| 91 | ;------------------------------------------------------------------------------\r | |
| 92 | PeiSwitchStacks PROC\r | |
| 93 | mov rax, rcx\r | |
| 94 | mov rcx, rdx\r | |
| 95 | mov rdx, r8\r | |
| 96 | mov r8, r9\r | |
| 97 | mov rsp, [rsp + 28h]\r | |
| 98 | sub rsp, 20h\r | |
| 99 | call rax\r | |
| 100 | jmp $\r | |
| 101 | ret\r | |
| 102 | PeiSwitchStacks ENDP\r | |
| 103 | \r | |
| 104 | END\r |