// Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

//

#include <setjmp.h>

#include <cpudefs.h>

extern "C" {

EXPORT_C __NAKED__ int setjmp(jmp_buf __jmpb)

	{

	asm ("mov eax, [esp+4]"); // eax = __jmpb

	asm ("mov [eax],    ebx");

	asm ("mov [eax+4],  esi");

	asm ("mov [eax+8],  edi");

	// Get caller's ESP by popping the parameter and the return address (8 bytes) from current ESP value

	asm ("mov edx, esp"); 

	asm ("add edx, 8"); 

	asm ("mov [eax+12], edx");	// caller's ESP

	asm ("mov [eax+16], ds");

	asm ("mov [eax+20], es");

	asm ("mov [eax+24], fs");

	asm ("mov [eax+28], gs");

	asm ("mov [eax+32], ebp");	// caller's EBP (stack frame)

	asm ("mov edx, [esp]");		// Save the retaddr because it's also the

	asm ("mov [eax+36], edx");	// place in the calling function to which longjmp() must return to

	asm ("mov eax, 0");

	asm ("ret");

	}

EXPORT_C __NAKED__ void longjmp(jmp_buf __jmpb, int __retval)

	{

	asm("mov eax, [esp+4]");	// eax = __jmpb

	// If __retval is 0 (KErrNone?) change it to a non-zero value

	asm("mov edx, [esp+8]");	// edx = __retval

	asm("cmp edx, 0");

	asm("jne is_not_zero");

	asm("inc edx"); 

	asm("is_not_zero:");	

	asm("mov [eax+40],edx");	// __jmpb[10]=__retval

	asm("mov ebp, [eax+12]");

	asm("mov esp, ebp");		// restore setjmp caller's ESP 

	asm("mov ebx, [eax]");

	asm("mov esi, [eax+4]");

	asm("mov edi, [eax+8]");

	asm("mov ds, [eax+16]");

	asm("mov es, [eax+20]");

	asm("mov fs, [eax+24]");

	asm("mov gs, [eax+28]");

	asm("mov ebp, [eax+32]"); // restore setjmp caller's EBP

	asm("mov eax, [eax+36]"); // push return address on stack

	asm("push eax");

	asm("mov eax,edx");	

	asm("ret");				// magically ret's to instruction following call to setjmp() with eax==__retval

	}

} // extern "C"