/**************************************************************************
**
** 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.
**
**************************************************************************/

extern "C" {
void __declspec(naked) _switchStackInternal(void* to, void** from)
{
    __asm {
    // save callee-saved registers
    PUSH EBP
    MOV EBP, ESP
    PUSH EBX
    PUSH ESI
    PUSH EDI

    // store SIMD floating point control word
    SUB ESP, 4
    STMXCSR [ESP]

    // store floating point control bytes
    SUB ESP, 4
    FSTCW [ESP]

    // save the old stack pointer
    MOV EDX, dword ptr 12[EBP]
    MOV [EDX], ESP
    // set the new stack pointer
    MOV ESP, dword ptr 8[EBP]

    // restore floating point control bytes
    FNCLEX
    FLDCW [ESP]
    ADD ESP, 4

    // restore SIMD floating point control word
    LDMXCSR [ESP]
    ADD ESP, 4

    // pop callee-saved registers
    POP EDI
    POP ESI
    POP EBX
    POP EBP        
    
    RET
    }
}
}
