b6cbf7203b
This patch imports the unmodified current version of NetBSD libc. The NetBSD includes are in /nbsd_include, while the libc code itself is split between lib/nbsd_libc and common/lib/libc.
85 lines
2.9 KiB
C
85 lines
2.9 KiB
C
/* $NetBSD: fpsetsticky.c,v 1.2 2008/04/28 20:22:57 martin Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1999 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Dan Winship.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
__RCSID("$NetBSD: fpsetsticky.c,v 1.2 2008/04/28 20:22:57 martin Exp $");
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
#include "namespace.h"
|
|
|
|
#include <sys/types.h>
|
|
#include <ieeefp.h>
|
|
#include <powerpc/fpu.h>
|
|
|
|
#define STICKYBITS (FPSCR_XX|FPSCR_ZX|FPSCR_UX|FPSCR_OX|FPSCR_VX)
|
|
#define INVBITS (FPSCR_VXCVI|FPSCR_VXSQRT|FPSCR_VXSOFT|FPSCR_VXVC|\
|
|
FPSCR_VXIMZ|FPSCR_VXZDZ|FPSCR_VXIDI|FPSCR_VXISI|\
|
|
FPSCR_VXSNAN)
|
|
#define STICKYSHFT 25
|
|
|
|
#ifdef __weak_alias
|
|
__weak_alias(fpsetsticky,_fpsetsticky)
|
|
#endif
|
|
|
|
fp_except
|
|
fpsetsticky(fp_except mask)
|
|
{
|
|
uint64_t fpscr;
|
|
fp_except old;
|
|
|
|
__asm volatile("mffs %0" : "=f"(fpscr));
|
|
old = ((uint32_t)fpscr & STICKYBITS) >> STICKYSHFT;
|
|
/*
|
|
* FPSCR_VX (aka FP_X_INV) is not a sticky bit but a summary of the
|
|
* all the FPSCR_VX* sticky bits. So when FP_X_INV is cleared then
|
|
* clear all of those bits, likewise when it's set, set them all.
|
|
*/
|
|
if ((mask & FP_X_INV) == 0)
|
|
fpscr &= ~INVBITS;
|
|
else
|
|
fpscr |= INVBITS;
|
|
fpscr &= ~STICKYBITS;
|
|
fpscr |= ((uint32_t)mask << STICKYSHFT) & STICKYBITS;
|
|
/*
|
|
* Make FPSCR_FX reflect the presence of a set sticky bit (or not).
|
|
*/
|
|
if (fpscr & (STICKYBITS|INVBITS))
|
|
fpscr |= FPSCR_FX;
|
|
else
|
|
fpscr &= ~FPSCR_FX;
|
|
/*
|
|
* Write back the fpscr.
|
|
*/
|
|
__asm volatile("mtfsf 0xff,%0" :: "f"(fpscr));
|
|
return (old);
|
|
}
|