1 // Copyright (c) 2007-2010 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".

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 

    15 #include "TraceCoreRegisterWriter.h"

    16 

    17 /**

    18  * InterrupsDisabled

    19  * Check if interrupts IRQ/FIQ disabled

    20  * Return 0x08 if only IRQ disabled, 0x04 if only FIQ disabled, 0x0C if both disabled.

    21  * @return true if interrupt(s) disabled, otherwise 0 (false)

    22  */

    23 /*EXPORT_C*/ __NAKED__ TUint32 DTraceCoreRegisterWriter::InterruptsDisabled() 

    24     {

    25     // save work regs

    26     asm( "stmfd sp!, {r2, r4}" );

    27 	

    28     // check if interrupts disabled

    29     asm( "mrs r2,cpsr" );

    30     asm( "and r0,r2,#0xc0" ); // 0b11000000 IRQ disabled bit 7, FIQ disabled bit 6

    31 		

    32     // restore work regs

    33     asm( "ldmfd sp!,{r2,r4}" );

    34 	

    35     // move pc,lr

    36     asm( "bx lr" );

    37     }

    38