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 fpsetmask(fp_except mask)18fpsetmask(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 } 29