sysdeps/sparc/fpu/fpu_control.h

   1 /* FPU control word bits.  SPARC version.
   2    Copyright (C) 1997-2024 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    <https://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _FPU_CONTROL_H
  20 #define _FPU_CONTROL_H  1
  21
  22
  23 #include <features.h>
  24 #include <bits/wordsize.h>
  25
  26 /* masking of interrupts */
  27 #define _FPU_MASK_IM  0x08000000
  28 #define _FPU_MASK_OM  0x04000000
  29 #define _FPU_MASK_UM  0x02000000
  30 #define _FPU_MASK_ZM  0x01000000
  31 #define _FPU_MASK_PM  0x00800000
  32
  33 /* precision control */
  34 #define _FPU_EXTENDED 0x00000000     /* RECOMMENDED */
  35 #define _FPU_DOUBLE   0x20000000
  36 #define _FPU_80BIT    0x30000000
  37 #define _FPU_SINGLE   0x10000000     /* DO NOT USE */
  38
  39 /* rounding control / Sparc */
  40 #define _FPU_RC_DOWN    0xc0000000
  41 #define _FPU_RC_UP      0x80000000
  42 #define _FPU_RC_ZERO    0x40000000
  43 #define _FPU_RC_NEAREST 0x0        /* RECOMMENDED */
  44
  45 #define _FPU_RESERVED   0x303e0000  /* Reserved bits in cw */
  46
  47
  48 /* Now two recommended cw */
  49
  50 /* Linux and IEEE default:
  51      - extended precision
  52      - rounding to nearest
  53      - no exceptions  */
  54 #define _FPU_DEFAULT  0x0
  55 #define _FPU_IEEE     0x0
  56
  57 /* Type of the control word.  */
  58 typedef unsigned long int fpu_control_t;
  59
  60 #if __WORDSIZE == 64
  61 # define _FPU_GETCW(cw) __asm__ __volatile__ ("stx %%fsr,%0" : "=m" (*&cw))
  62 # define _FPU_SETCW(cw) __asm__ __volatile__ ("ldx %0,%%fsr" : : "m" (*&cw))
  63 #else
  64 # ifdef __leon__
  65    /* Prevent stfsr from being placed directly after other fp instruction.  */
  66 #  define _FPU_GETCW(cw) __asm__ __volatile__ ("nop; st %%fsr,%0" : "=m" (*&cw))
  67 # else
  68 #  define _FPU_GETCW(cw) __asm__ __volatile__ ("st %%fsr,%0" : "=m" (*&cw))
  69 # endif
  70 # define _FPU_SETCW(cw) __asm__ __volatile__ ("ld %0,%%fsr" : : "m" (*&cw))
  71 #endif
  72
  73 /* Default control word set at startup.  */
  74 extern fpu_control_t __fpu_control;
  75
  76 #endif  /* fpu_control.h */