sysdeps/sparc/fpu/fpu_control.h

   1 /* FPU control word bits.  SPARC version.
   2    Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Miguel de Icaza
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #ifndef _FPU_CONTROL_H
  22 #define _FPU_CONTROL_H  1
  23
  24
  25 #include <features.h>
  26 #include <bits/wordsize.h>
  27
  28 /* masking of interrupts */
  29 #define _FPU_MASK_IM  0x08000000
  30 #define _FPU_MASK_OM  0x04000000
  31 #define _FPU_MASK_UM  0x02000000
  32 #define _FPU_MASK_ZM  0x01000000
  33 #define _FPU_MASK_PM  0x00800000
  34
  35 /* precision control */
  36 #define _FPU_EXTENDED 0x00000000     /* RECOMMENDED */
  37 #define _FPU_DOUBLE   0x20000000
  38 #define _FPU_80BIT    0x30000000
  39 #define _FPU_SINGLE   0x10000000     /* DO NOT USE */
  40
  41 /* rounding control / Sparc */
  42 #define _FPU_RC_DOWN    0xc0000000
  43 #define _FPU_RC_UP      0x80000000
  44 #define _FPU_RC_ZERO    0x40000000
  45 #define _FPU_RC_NEAREST 0x0        /* RECOMMENDED */
  46
  47 #define _FPU_RESERVED   0x30300000  /* Reserved bits in cw */
  48
  49
  50 /* Now two recommended cw */
  51
  52 /* Linux and IEEE default:
  53      - extended precision
  54      - rounding to nearest
  55      - no exceptions  */
  56 #define _FPU_DEFAULT  0x0
  57 #define _FPU_IEEE     0x0
  58
  59 /* Type of the control word.  */
  60 typedef unsigned long int fpu_control_t;
  61
  62 #if __WORDSIZE == 64
  63 # define _FPU_GETCW(cw) __asm__ ("stx %%fsr,%0" : "=m" (*&cw))
  64 # define _FPU_SETCW(cw) __asm__ ("ldx %0,%%fsr" : : "m" (*&cw))
  65 #else
  66 # define _FPU_GETCW(cw) __asm__ ("st %%fsr,%0" : "=m" (*&cw))
  67 # define _FPU_SETCW(cw) __asm__ ("ld %0,%%fsr" : : "m" (*&cw))
  68 #endif
  69
  70 /* Default control word set at startup.  */
  71 extern fpu_control_t __fpu_control;
  72
  73 #endif  /* fpu_control.h */