1/* $NetBSD: fpsetmask.c,v 1.5 2009/01/25 16:44:41 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 1.5 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 17fp_except 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