author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 31 Aug 2010 16:54:36 +0300 | |
branch | RCL_3 |
changeset 56 | acd3cd4aaceb |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
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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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|
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#include <setjmp.h> |
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#include <cpudefs.h> |
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|
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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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|
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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" |