;------------------------------------------------------------------------------ | |
; | |
; Copyright (c) 2016, Intel Corporation. All rights reserved.<BR> | |
; Portions copyright (c) 2011, Apple Inc. All rights reserved.<BR> | |
; SPDX-License-Identifier: BSD-2-Clause-Patent | |
; | |
; Module Name: | |
; | |
; InternalSwitchStack.nasm | |
; | |
; Abstract: | |
; | |
; Implementation of a stack switch on IA-32. | |
; | |
;------------------------------------------------------------------------------ | |
SECTION .text | |
;------------------------------------------------------------------------------ | |
; VOID | |
; EFIAPI | |
; InternalSwitchStack ( | |
; IN SWITCH_STACK_ENTRY_POINT EntryPoint, | |
; IN VOID *Context1, OPTIONAL | |
; IN VOID *Context2, OPTIONAL | |
; IN VOID *NewStack | |
; ); | |
;------------------------------------------------------------------------------ | |
global ASM_PFX(InternalSwitchStack) | |
ASM_PFX(InternalSwitchStack): | |
push ebp | |
mov ebp, esp | |
mov esp, [ebp + 20] ; switch stack | |
sub esp, 8 | |
mov eax, [ebp + 16] | |
mov [esp + 4], eax | |
mov eax, [ebp + 12] | |
mov [esp], eax | |
push 0 ; keeps gdb from unwinding stack | |
jmp dword [ebp + 8] ; call and never return |