sysdeps/arm/fpu_control.h

   1 /* FPU control word definitions.  ARM VFP version.
   2    Copyright (C) 2004, 2005, 2009 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library.  If not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _FPU_CONTROL_H
  20 #define _FPU_CONTROL_H
  21
  22 #if !defined(_LIBC) && defined(__SOFTFP__)
  23
  24 #define _FPU_RESERVED 0xffffffff
  25 #define _FPU_DEFAULT  0x00000000
  26 typedef unsigned int fpu_control_t;
  27 #define _FPU_GETCW(cw) 0
  28 #define _FPU_SETCW(cw) do { } while (0)
  29 extern fpu_control_t __fpu_control;
  30
  31 #else
  32
  33 /* masking of interrupts */
  34 #define _FPU_MASK_IM    0x00000100      /* invalid operation */
  35 #define _FPU_MASK_ZM    0x00000200      /* divide by zero */
  36 #define _FPU_MASK_OM    0x00000400      /* overflow */
  37 #define _FPU_MASK_UM    0x00000800      /* underflow */
  38 #define _FPU_MASK_PM    0x00001000      /* inexact */
  39
  40 /* Some bits in the FPSCR are not yet defined.  They must be preserved when
  41    modifying the contents.  */
  42 #define _FPU_RESERVED   0x0e08e0e0
  43 #define _FPU_DEFAULT    0x00000000
  44 /* Default + exceptions enabled. */
  45 #define _FPU_IEEE       (_FPU_DEFAULT | 0x00001f00)
  46
  47 /* Type of the control word.  */
  48 typedef unsigned int fpu_control_t;
  49
  50 /* Macros for accessing the hardware control word.  */
  51 /* This is fmrx %0, fpscr.  */
  52 #define _FPU_GETCW(cw) \
  53   __asm__ __volatile__ ("mrc p10, 7, %0, cr1, cr0, 0" : "=r" (cw))
  54 /* This is fmxr fpscr, %0.  */
  55 #define _FPU_SETCW(cw) \
  56   __asm__ __volatile__ ("mcr p10, 7, %0, cr1, cr0, 0" : : "r" (cw))
  57
  58 /* Default control word set at startup.  */
  59 extern fpu_control_t __fpu_control;
  60
  61 #endif /* __SOFTFP__ */
  62
  63 #endif /* _FPU_CONTROL_H */