1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/os/ossrv/genericopenlibs/cstdlib/LSIGNAL/JMP_X86GCC.CIA	Fri Jun 15 03:10:57 2012 +0200
     1.3 @@ -0,0 +1,73 @@
     1.4 +// Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).
     1.5 +// All rights reserved.
     1.6 +// This component and the accompanying materials are made available
     1.7 +// under the terms of "Eclipse Public License v1.0"
     1.8 +// which accompanies this distribution, and is available
     1.9 +// at the URL "http://www.eclipse.org/legal/epl-v10.html".
    1.10 +//
    1.11 +// Initial Contributors:
    1.12 +// Nokia Corporation - initial contribution.
    1.13 +//
    1.14 +// Contributors:
    1.15 +//
    1.16 +// Description:
    1.17 +//
    1.18 +
    1.19 +#include <setjmp.h>
    1.20 +#include <cpudefs.h>
    1.21 +
    1.22 +extern "C" {
    1.23 +
    1.24 +EXPORT_C __NAKED__ int setjmp(jmp_buf __jmpb)
    1.25 +	{
    1.26 +	asm ("mov eax, [esp+4]"); // eax = __jmpb
    1.27 +	asm ("mov [eax],    ebx");
    1.28 +	asm ("mov [eax+4],  esi");
    1.29 +	asm ("mov [eax+8],  edi");
    1.30 +
    1.31 +	// Get caller's ESP by popping the parameter and the return address (8 bytes) from current ESP value
    1.32 +	asm ("mov edx, esp"); 
    1.33 +	asm ("add edx, 8"); 
    1.34 +	asm ("mov [eax+12], edx");	// caller's ESP
    1.35 +	asm ("mov [eax+16], ds");
    1.36 +	asm ("mov [eax+20], es");
    1.37 +	asm ("mov [eax+24], fs");
    1.38 +	asm ("mov [eax+28], gs");
    1.39 +	asm ("mov [eax+32], ebp");	// caller's EBP (stack frame)
    1.40 +	asm ("mov edx, [esp]");		// Save the retaddr because it's also the
    1.41 +	asm ("mov [eax+36], edx");	// place in the calling function to which longjmp() must return to
    1.42 +	asm ("mov eax, 0");
    1.43 +	asm ("ret");
    1.44 +	}
    1.45 +
    1.46 +EXPORT_C __NAKED__ void longjmp(jmp_buf __jmpb, int __retval)
    1.47 +	{
    1.48 +	asm("mov eax, [esp+4]");	// eax = __jmpb
    1.49 +
    1.50 +	// If __retval is 0 (KErrNone?) change it to a non-zero value
    1.51 +	asm("mov edx, [esp+8]");	// edx = __retval
    1.52 +	asm("cmp edx, 0");
    1.53 +	asm("jne is_not_zero");
    1.54 +	asm("inc edx"); 
    1.55 +	asm("is_not_zero:");	
    1.56 +	asm("mov [eax+40],edx");	// __jmpb[10]=__retval
    1.57 +
    1.58 +	asm("mov ebp, [eax+12]");
    1.59 +	asm("mov esp, ebp");		// restore setjmp caller's ESP 
    1.60 +	asm("mov ebx, [eax]");
    1.61 +	asm("mov esi, [eax+4]");
    1.62 +	asm("mov edi, [eax+8]");
    1.63 +	asm("mov ds, [eax+16]");
    1.64 +	asm("mov es, [eax+20]");
    1.65 +	asm("mov fs, [eax+24]");
    1.66 +	asm("mov gs, [eax+28]");
    1.67 +
    1.68 +	asm("mov ebp, [eax+32]"); // restore setjmp caller's EBP
    1.69 +		
    1.70 +	asm("mov eax, [eax+36]"); // push return address on stack
    1.71 +	asm("push eax");
    1.72 +	asm("mov eax,edx");	
    1.73 +	asm("ret");				// magically ret's to instruction following call to setjmp() with eax==__retval
    1.74 +	}
    1.75 +
    1.76 +} // extern "C"