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##########################################################################
##
## This file is part of the Coroutine library
##
## Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
##
## Contact: Nokia Corporation (qt-info@nokia.com)
##
## Commercial Usage
##
## Licensees holding valid Qt Commercial licenses may use this file in
## accordance with the Qt Commercial License Agreement provided with the
## Software or, alternatively, in accordance with the terms contained in
## a written agreement between you and Nokia.
##
## GNU Lesser General Public License Usage
##
## Alternatively, this file may be used under the terms of the GNU Lesser
## General Public License version 2.1 as published by the Free Software
## Foundation and appearing in the file LICENSE.LGPL included in the
## packaging of this file. Please review the following information to
## ensure the GNU Lesser General Public License version 2.1 requirements
## will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
##
## If you are unsure which license is appropriate for your use, please
## contact the sales department at http://qt.nokia.com/contact.
##
##########################################################################
.global __switchStackInternal
.section .text
.def __switchStackInternal ; .scl 2 ; .type 32 ; .endef
__switchStackInternal:
// save callee-saved registers
push %ebp
movl %esp, %ebp
push %ebx
push %esi
push %edi
// store SIMD floating point control word
sub $4, %esp
stmxcsr (%esp)
// store floating point control bytes
sub $4, %esp
fstcw (%esp)
// save the old stack pointer
movl 0xc(%ebp), %edx
movl %esp, (%edx)
// set the new stack pointer
movl 0x8(%ebp), %esp
// restore floating point control bytes
fnclex
fldcw (%esp)
add $4, %esp
// restore SIMD floating point control word
ldmxcsr (%esp)
add $4, %esp
// pop callee-saved registers
pop %edi
pop %esi
pop %ebx
pop %ebp
ret
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