1 /* $NetBSD: fpsetsticky.c,v 1.5 2009/01/25 16:44:41 skrll Exp $ */ 2 3 /* $OpenBSD: fpsetsticky.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: fpsetsticky.c,v 1.5 2009/01/25 16:44:41 skrll Exp $"); 12 #endif /* LIBC_SCCS and not lint */ 13 14 #include <sys/types.h> 15 #include <ieeefp.h> 16 17 fp_except 18 fpsetsticky(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 = (fpsr >> 59) & 0x1f; 25 fpsr = (fpsr & 0x07ffffff00000000LL) | ((uint64_t)(mask & 0x1f) << 59); 26 __asm volatile("fldd 0(%0),%%fr0" : : "r" (&fpsr) : "memory"); 27 28 return (old); 29 } 30