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Update cpuport.c

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Bernard Xiong 2017-10-06 11:43:50 +08:00 committed by GitHub
parent f0061b14d3
commit c2f028ed8d
1 changed files with 54 additions and 73 deletions
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47
libcpu/nds32/cpuport.c
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@ -1,20 +1,22 @@
/*
* File : cpuport.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006 - 2013, RT-Thread Development Team
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rt-thread.org/license/LICENSE
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Change Logs:
* Date Author Notes
* 2009-01-05 Bernard first version
* 2011-02-14 onelife Modify for EFM32
* 2011-06-17 onelife Merge all of the C source code into cpuport.c
* 2012-12-23 aozima stack addr align to 8byte.
* 2012-12-29 Bernard Add exception hook.
* 2013-07-09 aozima enhancement hard fault exception handler.
* 2017-08-25 Archer first version
*/
#include <rtthread.h>
@ -190,28 +192,7 @@ void rt_hw_exception_install(rt_err_t (*exception_handle)(void* context))
* @return return the index of the first bit set. If value is 0, then this function
* shall return 0.
*/
#if defined(__CC_ARM)
__asm int __rt_ffs(int value)
{
CMP r0, #0x00
BEQ exit
RBIT r0, r0
CLZ r0, r0
ADDS r0, r0, #0x01
exit
BX lr
}
#elif defined(__IAR_SYSTEMS_ICC__)
int __rt_ffs(int value)
{
if (value == 0) return value;
__ASM("RBIT r0, r0");
__ASM("CLZ r0, r0");
__ASM("ADDS r0, r0, #0x01");
}
#elif defined(__GNUC__)
#if defined(__GNUC__)
int __rt_ffs(int value)
{
return __builtin_ffs(value);