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#------------------------------------------------------------------------------
#
# Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
# Portions copyright (c) 2011, Apple Inc. All rights reserved.
# This program and the accompanying materials
# are licensed and made available under the terms and conditions of the BSD License
# which accompanies this distribution. The full text of the license may be found at
# http://opensource.org/licenses/bsd-license.php.
#
# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
#
# Module Name:
#
# InternalSwitchStack.S
#
# Abstract:
#
# Implementation of a stack switch on IA-32.
#
#------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(InternalSwitchStack)
#------------------------------------------------------------------------------
# VOID
# EFIAPI
# InternalSwitchStack (
# IN SWITCH_STACK_ENTRY_POINT EntryPoint,
# IN VOID *Context1, OPTIONAL
# IN VOID *Context2, OPTIONAL
# IN VOID *NewStack
# );
#------------------------------------------------------------------------------
ASM_PFX(InternalSwitchStack):
pushl %ebp
movl %esp, %ebp
movl 20(%ebp), %esp # switch stack
subl $8, %esp
movl 16(%ebp), %eax
movl %eax, 4(%esp)
movl 12(%ebp), %eax
movl %eax, (%esp)
pushl $0 # keeps gdb from unwinding stack
jmp *8(%ebp) # call and never return
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