1  /* FPU control word definitions.  SH version.
       2     Copyright (C) 1999-2023 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
      21  
      22  #if !defined(__SH_FPU_ANY__)
      23  
      24  #define _FPU_RESERVED 0xffffffff
      25  #define _FPU_DEFAULT  0x00000000
      26  typedef unsigned int fpu_control_t;
      27  #define _FPU_GETCW(cw) (cw) = 0
      28  #define _FPU_SETCW(cw) (void) (cw)
      29  extern fpu_control_t __fpu_control;
      30  
      31  #else
      32  
      33  #include <features.h>
      34  
      35  /* masking of interrupts */
      36  #define _FPU_MASK_VM	0x0800	/* Invalid operation */
      37  #define _FPU_MASK_ZM	0x0400	/* Division by zero  */
      38  #define _FPU_MASK_OM	0x0200	/* Overflow	     */
      39  #define _FPU_MASK_UM	0x0100	/* Underflow	     */
      40  #define _FPU_MASK_IM	0x0080	/* Inexact operation */
      41  
      42  /* rounding control */
      43  #define _FPU_RC_NEAREST 0x0	/* RECOMMENDED */
      44  #define _FPU_RC_ZERO	0x1
      45  
      46  #define _FPU_RESERVED 0xffc00000  /* These bits are reserved.  */
      47  
      48  /* The fdlibm code requires strict IEEE double precision arithmetic,
      49     and no interrupts for exceptions, rounding to nearest.  */
      50  #define _FPU_DEFAULT	0x00080000 /* Default value.  */
      51  #define _FPU_IEEE	0x00080f80 /* Default + exceptions enabled. */
      52  
      53  /* Type of the control word.  */
      54  typedef unsigned int fpu_control_t;
      55  
      56  /* Macros for accessing the hardware control word.  */
      57  #define _FPU_GETCW(cw) __asm__ ("sts fpscr,%0" : "=r" (cw))
      58  
      59  #if defined __GNUC__
      60  __BEGIN_DECLS
      61  
      62  /* GCC provides this function.  */
      63  extern void __set_fpscr (unsigned long);
      64  #define _FPU_SETCW(cw) __set_fpscr ((cw))
      65  #else
      66  #define _FPU_SETCW(cw) __asm__ ("lds %0,fpscr" : : "r" (cw))
      67  #endif
      68  
      69  /* Default control word set at startup.	 */
      70  extern fpu_control_t __fpu_control;
      71  
      72  __END_DECLS
      73  
      74  #endif /* __SH_FPU_ANY__ */
      75  
      76  #endif /* _FPU_CONTROL_H */