1 /* $OpenBSD: fpsetmask.c,v 1.5 2014/04/18 15:09:52 guenther Exp $ */ 2 3 /* 4 * Written by Miodrag Vallat. Public domain 5 */ 6 7 #include <sys/types.h> 8 #include <ieeefp.h> 9 10 fp_except 11 fpsetmask(mask) 12 fp_except mask; 13 { 14 u_int64_t fpsr; 15 fp_except old; 16 17 __asm__ volatile("fstd %%fr0,0(%1)" : "=m"(fpsr) : "r"(&fpsr)); 18 old = (fpsr >> 32) & 0x1f; 19 fpsr = (fpsr & 0xffffffe000000000LL) | ((u_int64_t)(mask & 0x1f) << 32); 20 __asm__ volatile("fldd 0(%0),%%fr0" : : "r"(&fpsr)); 21 return (old); 22 } 23