#------------------------------------------------------------------------------ | |
# | |
# Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR> | |
# Portions copyright (c) 2011, Apple Inc. All rights reserved.<BR> | |
# 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 | |