projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 65960189 LG |
1 | ;------------------------------------------------------------------------------\r |
| 2 | ;\r | |
| 3 | ; Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>\r | |
| 4 | ; Portions copyright (c) 2011, Apple Inc. All rights reserved.<BR>\r | |
| 9344f092 | 5 | ; SPDX-License-Identifier: BSD-2-Clause-Patent\r |
| 65960189 LG |
6 | ;\r |
| 7 | ; Module Name:\r | |
| 8 | ;\r | |
| 9 | ; InternalSwitchStack.nasm\r | |
| 10 | ;\r | |
| 11 | ; Abstract:\r | |
| 12 | ;\r | |
| 13 | ; Implementation of a stack switch on IA-32.\r | |
| 14 | ;\r | |
| 15 | ;------------------------------------------------------------------------------\r | |
| 16 | \r | |
| 17 | SECTION .text\r | |
| 18 | \r | |
| 19 | ;------------------------------------------------------------------------------\r | |
| 20 | ; VOID\r | |
| 21 | ; EFIAPI\r | |
| 22 | ; InternalSwitchStack (\r | |
| 23 | ; IN SWITCH_STACK_ENTRY_POINT EntryPoint,\r | |
| 24 | ; IN VOID *Context1, OPTIONAL\r | |
| 25 | ; IN VOID *Context2, OPTIONAL\r | |
| 26 | ; IN VOID *NewStack\r | |
| 27 | ; );\r | |
| 28 | ;------------------------------------------------------------------------------\r | |
| 29 | global ASM_PFX(InternalSwitchStack)\r | |
| 30 | ASM_PFX(InternalSwitchStack):\r | |
| 31 | push ebp\r | |
| 32 | mov ebp, esp\r | |
| 33 | \r | |
| 34 | mov esp, [ebp + 20] ; switch stack\r | |
| 35 | sub esp, 8\r | |
| 36 | mov eax, [ebp + 16]\r | |
| 37 | mov [esp + 4], eax\r | |
| 38 | mov eax, [ebp + 12]\r | |
| 39 | mov [esp], eax\r | |
| 40 | push 0 ; keeps gdb from unwinding stack\r | |
| 41 | jmp dword [ebp + 8] ; call and never return\r |