121 lines
2.9 KiB
C
121 lines
2.9 KiB
C
/****************************************************************************
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* libs/libc/machine/arm/arm_fenv.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <assert.h>
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#include <fenv.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define ARM_FPSCR_TONEAREST 0x00000000
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#define ARM_FPSCR_DOWNWARD 0x00400000
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#define ARM_FPSCR_UPWARD 0x00800000
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#define ARM_FPSCR_TOWARDZERO 0x00c00000
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#define ARM_FPSCR_ROUNDMASK 0x00c00000
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#define SET_FPSCR(__r) __asm __volatile("vmrs %0, fpscr" : "=&r"(__r))
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#define GET_FPSCR(__r) __asm __volatile("vmsr fpscr, %0" : : "r"(__r))
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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int fegetround(void)
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{
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int ret = FE_TONEAREST;
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#ifndef __SOFTFP__
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int fpscr = 0;
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GET_FPSCR(fpscr);
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fpscr &= ARM_FPSCR_ROUNDMASK;
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switch (fpscr)
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{
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case ARM_FPSCR_TONEAREST:
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ret = FE_TONEAREST;
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break;
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case ARM_FPSCR_DOWNWARD:
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ret = FE_DOWNWARD;
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break;
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case ARM_FPSCR_UPWARD:
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ret = FE_UPWARD;
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break;
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case ARM_FPSCR_TOWARDZERO:
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ret = FE_TOWARDZERO;
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break;
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default:
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assert(0);
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break;
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}
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#endif
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return ret;
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}
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int fesetround(int round)
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{
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#ifndef __SOFTFP__
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int fpscr = 0;
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GET_FPSCR(fpscr);
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fpscr &= ~(ARM_FPSCR_ROUNDMASK);
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switch (fpscr)
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{
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case FE_TONEAREST:
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round = ARM_FPSCR_TONEAREST;
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break;
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case FE_DOWNWARD:
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round = ARM_FPSCR_DOWNWARD;
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break;
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case FE_UPWARD:
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round = ARM_FPSCR_UPWARD;
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break;
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case FE_TOWARDZERO:
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round = ARM_FPSCR_TOWARDZERO;
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break;
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default:
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assert(0);
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break;
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}
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fpscr |= round;
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SET_FPSCR(fpscr);
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#endif
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return (0);
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}
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