1 /* $NetBSD: fpsetmask.c,v 1.6 2012/03/17 21:35:06 martin Exp $ */ 2 3 /* 4 * Written by J.T. Conklin, Apr 10, 1995 5 * Public domain. 6 */ 7 8 #include <sys/cdefs.h> 9 #if defined(LIBC_SCCS) && !defined(lint) 10 __RCSID("$NetBSD: fpsetmask.c,v 1.6 2012/03/17 21:35:06 martin Exp $"); 11 #endif /* LIBC_SCCS and not lint */ 12 13 #include "namespace.h" 14 15 #include <sys/types.h> 16 #include <ieeefp.h> 17 18 #ifdef __weak_alias 19 __weak_alias(fpsetmask,_fpsetmask) 20 #endif 21 22 #ifdef EXCEPTIONS_WITH_SOFTFLOAT 23 extern fp_except _softfloat_float_exception_mask; 24 #endif 25 26 fp_except 27 fpsetmask(mask) 28 fp_except mask; 29 { 30 fp_except old; 31 fp_except new; 32 33 __asm("st %%fsr,%0" : "=m" (*&old)); 34 35 new = old; 36 new &= ~(0x1f << 23); 37 new |= ((mask & 0x1f) << 23); 38 39 __asm("ld %0,%%fsr" : : "m" (*&new)); 40 41 old = ((uint32_t)old >> 23) & 0x1f; 42 43 #ifdef EXCEPTIONS_WITH_SOFTFLOAT 44 /* update softfloat mask as well */ 45 old |= _softfloat_float_exception_mask; 46 _softfloat_float_exception_mask = mask; 47 #endif 48 49 return old; 50 } 51