lib/libc/arch/sparc64/gen/fpsetmask.c

   1 /*      $NetBSD: fpsetmask.c,v 1.7 2013/10/28 01:06:36 mrg Exp $        */
   2
   3 /*
   4  * Written by J.T. Conklin, Apr 10, 1995
   5  * Public domain.
   6  */
   7
   8 #include <sys/cdefs.h>
   9 #if defined(LIBC_SCCS) && !defined(lint)
  10 __RCSID("$NetBSD: fpsetmask.c,v 1.7 2013/10/28 01:06:36 mrg Exp $");
  11 #endif /* LIBC_SCCS and not lint */
  12
  13 #include "namespace.h"
  14
  15 #include <sys/types.h>
  16 #include <ieeefp.h>
  17
  18 #ifdef __weak_alias
  19 __weak_alias(fpsetmask,_fpsetmask)
  20 #endif
  21
  22 #ifdef EXCEPTIONS_WITH_SOFTFLOAT
  23 extern fp_except _softfloat_float_exception_mask;
  24 #endif
  25
  26 fp_except
  27 fpsetmask(fp_except mask)
  28 {
  29         fp_except old;
  30         fp_except new;
  31
  32         __asm("st %%fsr,%0" : "=m" (*&old));
  33
  34         new = old;
  35         new &= ~(0x1f << 23);
  36         new |= ((mask & 0x1f) << 23);
  37
  38         __asm("ld %0,%%fsr" : : "m" (*&new));
  39
  40         old = ((uint32_t)old >> 23) & 0x1f;
  41
  42 #ifdef EXCEPTIONS_WITH_SOFTFLOAT
  43         /* update softfloat mask as well */
  44         old |= _softfloat_float_exception_mask;
  45         _softfloat_float_exception_mask = mask;
  46 #endif
  47
  48         return old;
  49 }