hybris/include/hybris/internal/floating_point_abi.h

   1 /*
   2  * Copyright (C) 2013 Jolla Ltd.
   3  * Contact: Thomas Perl <thomas.perl@jollamobile.com>
   4  *
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  *      http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18 #ifndef HYBRIS_FLOATING_POINT_ABI_H_
  19 #define HYBRIS_FLOATING_POINT_ABI_H_
  20
  21 /**
  22  * Make sure to use FP_ATTRIB on all functions that are loaded from
  23  * Android (bionic libc) libraries to make sure floating point arguments
  24  * are passed the right way.
  25  *
  26  * See: http://wiki.debian.org/ArmHardFloatPort/VfpComparison
  27  *      http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
  28  *
  29  * It doesn't hurt to have it added for non-floating point arguments and
  30  * return types, even though it does not really have any effect.
  31  *
  32  * If you use the convenience macros in hybris/internal/binding.h, your
  33  * wrapper functions will automatically make use of this attribute.
  34  **/
  35
  36 #ifdef __ARM_PCS_VFP
  37 #  define FP_ATTRIB __attribute__((pcs("aapcs")))
  38 #else
  39 #  define FP_ATTRIB
  40 #endif
  41
  42 #endif /* HYBRIS_FLOATING_POINT_ABI_H_ */