// 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>
extern "C" {
EXPORT_C int setjmp(jmp_buf __jmpb)
{
#ifdef __MARM_THUMB__
//the function destroys the contents of {r0,r1,r2,r3} registers
//r0 is used to hold the retrun value
//r1,r2,r3 - they are used usually to hold functions arguments/temp data and are
//not expected to preserve their values between functions calls.
asm("stmia r0!, {r4-r7}");//bytes {0..15} are occupied by {r4,r5,r6,r7} registers
asm("mov r2, r8");
asm("mov r3, r9");
asm("mov r4, r10");
asm("mov r5, r11");
asm("mov r6, sp");
asm("mov r7, lr");
asm("stmia r0!, {r2-r7}");//bytes {16..39} are occupied by {r8,r9,r10,r11,sp,lr} registers
asm("sub r0, #40");//r0 points now to the beginning of __jmpb
asm("ldmia r0!, {r4-r7}");//restore the contents of {r4,r5,r6,r7} registers
#else
asm("stmia r0, {r4-r11, sp, lr} "); // Save the context
#endif
return(0);
}
EXPORT_C void longjmp(jmp_buf __jmpb, int __retval)
{
#ifdef __MARM_THUMB__
asm("mov r3, r0"); // save the jmp_buf pointer
asm("add r3, #16"); //add on 16 to get to high registers
asm("ldmia r3!, {r4-r7}");
asm("mov r8,r4");
asm("mov r9,r5");
asm("mov r10,r6");
asm("mov r11,r7");
asm("ldmia r3!, {r4-r5}"); //get sp and lr
asm("mov sp, r4");
asm("mov lr, r5");
asm("mov r3, r0"); //get the jmp_buf ptr again
asm("ldmia r3!, {r4-r7}"); //and restore the lo regs
asm("mov r0, r1"); // return(__retval)
asm("cmp r0, #0");
asm("bne 1f");
asm("mov r0, #1");
asm("1:");
#else
asm("ldmia r0, {r4-r11, sp, lr} "); // Restore the context
asm("movs r0, r1"); // return(__retval == 0 ? 1 : retval)
asm("moveq r0, #1");
#endif
return;
}
} // extern "C"