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

   1 /*      $NetBSD: fpsetmask.c,v 1.6 2012/03/23 09:34:09 skrll Exp $      */
   2
   3 /*      $OpenBSD: fpsetmask.c,v 1.4 2004/01/05 06:06:16 otto Exp $      */
   4
   5 /*
   6  * Written by Miodrag Vallat.  Public domain
   7  */
   8
   9 #include <sys/cdefs.h>
  10 #if defined(LIBC_SCCS) && !defined(lint)
  11 __RCSID("$NetBSD: fpsetmask.c,v 1.6 2012/03/23 09:34:09 skrll Exp $");
  12 #endif /* LIBC_SCCS and not lint */
  13
  14 #include <sys/types.h>
  15 #include <ieeefp.h>
  16
  17 fp_except
  18 fpsetmask(fp_except mask)
  19 {
  20         uint64_t fpsr;
  21         fp_except old;
  22
  23         __asm volatile("fstd %%fr0,0(%1)" : "=m"(fpsr) : "r"(&fpsr) : "memory");
  24         old = (fp_except)(fpsr >> 32) & 0x1f;
  25         fpsr = (fpsr & 0xffffffe000000000LL) | ((uint64_t)(mask & 0x1f) << 32);
  26         __asm volatile("fldd 0(%0),%%fr0" : : "r"(&fpsr) : "memory");
  27         return (old);
  28 }