1  /* FPU control word definitions.  HP-PARISC version.
       2     Copyright (C) 2012-2023 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  /* Masking of interrupts.  */
      23  #define _FPU_MASK_PM	0x00000001	/* Inexact (I) */
      24  #define _FPU_MASK_UM	0x00000002	/* Underflow (U) */
      25  #define _FPU_MASK_OM	0x00000004	/* Overflow (O) */
      26  #define _FPU_MASK_ZM	0x00000008	/* Divide by zero (Z) */
      27  #define _FPU_MASK_IM	0x00000010	/* Invalid operation (V) */
      28  
      29  /* Masking of rounding modes.  */
      30  #define _FPU_HPPA_MASK_RM	0x00000600	/* Rounding mode mask */
      31  /* Masking of interrupt enable bits.  */
      32  #define _FPU_HPPA_MASK_INT	0x0000001f	/* Interrupt mask */
      33  /* Shift by 27 to install flag bits.  */
      34  #define _FPU_HPPA_SHIFT_FLAGS	27
      35  
      36  /* There are no reserved bits in the PA fpsr (though some are undefined).  */
      37  #define _FPU_RESERVED	0x00000000
      38  /* Default is: No traps enabled, no flags set, round to nearest.  */
      39  #define _FPU_DEFAULT    0x00000000
      40  /* Default + exceptions (FE_ALL_EXCEPT) enabled. */
      41  #define _FPU_IEEE	(_FPU_DEFAULT | _FPU_HPPA_MASK_INT)
      42  
      43  /* Type of the control word.  */
      44  typedef unsigned int fpu_control_t;
      45  
      46  /* Macros for accessing the hardware control word.  */
      47  #define _FPU_GETCW(cw) \
      48  ({										\
      49    union { __extension__ unsigned long long __fpreg; unsigned int __halfreg[2]; } __fullfp; \
      50    /* Get the current status word. */						\
      51    __asm__ ("fstd %%fr0,0(%1)\n\t"						\
      52             "fldd 0(%1),%%fr0\n\t"						\
      53  	   : "=m" (__fullfp.__fpreg) : "r" (&__fullfp.__fpreg) : "%r0");	\
      54    cw = __fullfp.__halfreg[0];							\
      55  })
      56  
      57  #define _FPU_SETCW(cw) \
      58  ({										\
      59    union { __extension__ unsigned long long __fpreg; unsigned int __halfreg[2]; } __fullfp;	\
      60    /* Get the current status word and set the control word.  */			\
      61    __asm__ ("fstd %%fr0,0(%1)\n\t"						\
      62  	   : "=m" (__fullfp.__fpreg) : "r" (&__fullfp.__fpreg) : "%r0");	\
      63    __fullfp.__halfreg[0] = cw;							\
      64    __asm__ ("fldd 0(%1),%%fr0\n\t"						\
      65  	   : : "m" (__fullfp.__fpreg), "r" (&__fullfp.__fpreg) : "%r0" );	\
      66  })
      67  
      68  /* Default control word set at startup.  */
      69  extern fpu_control_t __fpu_control;
      70  
      71  #endif /* _FPU_CONTROL_H */