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// Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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//
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#include <setjmp.h>
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#include <cpudefs.h>
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extern "C" {
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EXPORT_C __NAKED__ int setjmp(jmp_buf __jmpb)
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{
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asm ("mov eax, [esp+4]"); // eax = __jmpb
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asm ("mov [eax], ebx");
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asm ("mov [eax+4], esi");
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asm ("mov [eax+8], edi");
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// Get caller's ESP by popping the parameter and the return address (8 bytes) from current ESP value
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asm ("mov edx, esp");
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asm ("add edx, 8");
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asm ("mov [eax+12], edx"); // caller's ESP
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asm ("mov [eax+16], ds");
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asm ("mov [eax+20], es");
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asm ("mov [eax+24], fs");
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asm ("mov [eax+28], gs");
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asm ("mov [eax+32], ebp"); // caller's EBP (stack frame)
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asm ("mov edx, [esp]"); // Save the retaddr because it's also the
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asm ("mov [eax+36], edx"); // place in the calling function to which longjmp() must return to
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asm ("mov eax, 0");
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asm ("ret");
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}
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EXPORT_C __NAKED__ void longjmp(jmp_buf __jmpb, int __retval)
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{
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asm("mov eax, [esp+4]"); // eax = __jmpb
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// If __retval is 0 (KErrNone?) change it to a non-zero value
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asm("mov edx, [esp+8]"); // edx = __retval
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asm("cmp edx, 0");
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asm("jne is_not_zero");
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asm("inc edx");
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asm("is_not_zero:");
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asm("mov [eax+40],edx"); // __jmpb[10]=__retval
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asm("mov ebp, [eax+12]");
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asm("mov esp, ebp"); // restore setjmp caller's ESP
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asm("mov ebx, [eax]");
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asm("mov esi, [eax+4]");
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asm("mov edi, [eax+8]");
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asm("mov ds, [eax+16]");
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asm("mov es, [eax+20]");
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asm("mov fs, [eax+24]");
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asm("mov gs, [eax+28]");
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asm("mov ebp, [eax+32]"); // restore setjmp caller's EBP
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asm("mov eax, [eax+36]"); // push return address on stack
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asm("push eax");
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asm("mov eax,edx");
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asm("ret"); // magically ret's to instruction following call to setjmp() with eax==__retval
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}
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} // extern "C"
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