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