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

   1 /*      $NetBSD: fpsetsticky.c,v 1.6 2012/03/17 21:35:06 martin 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: fpsetsticky.c,v 1.6 2012/03/17 21:35:06 martin 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(fpsetsticky,_fpsetsticky)
  20 #endif
  21
  22 #ifdef EXCEPTIONS_WITH_SOFTFLOAT
  23 extern fp_except _softfloat_float_exception_flags;
  24 #endif
  25
  26 fp_except
  27 fpsetsticky(sticky)
  28         fp_except sticky;
  29 {
  30         fp_except old;
  31         fp_except new;
  32
  33         __asm("st %%fsr,%0" : "=m" (*&old));
  34
  35         new = old;
  36         new &= ~(0x1f << 5);
  37         new |= ((sticky & 0x1f) << 5);
  38
  39         __asm("ld %0,%%fsr" : : "m" (*&new));
  40
  41         old = ((uint32_t)old >> 5) & 0x1f;
  42
  43 #ifdef EXCEPTIONS_WITH_SOFTFLOAT
  44         old |= _softfloat_float_exception_flags;
  45         _softfloat_float_exception_flags = sticky;
  46 #endif
  47         return old;
  48 }