1 // Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).
2 // All rights reserved.
3 // This component and the accompanying materials are made available
4 // under the terms of "Eclipse Public License v1.0"
5 // which accompanies this distribution, and is available
6 // at the URL "http://www.eclipse.org/legal/epl-v10.html".
8 // Initial Contributors:
9 // Nokia Corporation - initial contribution.
21 EXPORT_C __NAKED__ int setjmp(jmp_buf __jmpb)
23 asm ("mov eax, [esp+4]"); // eax = __jmpb
24 asm ("mov [eax], ebx");
25 asm ("mov [eax+4], esi");
26 asm ("mov [eax+8], edi");
28 // Get caller's ESP by popping the parameter and the return address (8 bytes) from current ESP value
31 asm ("mov [eax+12], edx"); // caller's ESP
32 asm ("mov [eax+16], ds");
33 asm ("mov [eax+20], es");
34 asm ("mov [eax+24], fs");
35 asm ("mov [eax+28], gs");
36 asm ("mov [eax+32], ebp"); // caller's EBP (stack frame)
37 asm ("mov edx, [esp]"); // Save the retaddr because it's also the
38 asm ("mov [eax+36], edx"); // place in the calling function to which longjmp() must return to
43 EXPORT_C __NAKED__ void longjmp(jmp_buf __jmpb, int __retval)
45 asm("mov eax, [esp+4]"); // eax = __jmpb
47 // If __retval is 0 (KErrNone?) change it to a non-zero value
48 asm("mov edx, [esp+8]"); // edx = __retval
50 asm("jne is_not_zero");
53 asm("mov [eax+40],edx"); // __jmpb[10]=__retval
55 asm("mov ebp, [eax+12]");
56 asm("mov esp, ebp"); // restore setjmp caller's ESP
57 asm("mov ebx, [eax]");
58 asm("mov esi, [eax+4]");
59 asm("mov edi, [eax+8]");
60 asm("mov ds, [eax+16]");
61 asm("mov es, [eax+20]");
62 asm("mov fs, [eax+24]");
63 asm("mov gs, [eax+28]");
65 asm("mov ebp, [eax+32]"); // restore setjmp caller's EBP
67 asm("mov eax, [eax+36]"); // push return address on stack
70 asm("ret"); // magically ret's to instruction following call to setjmp() with eax==__retval