| /*- |
| * Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG> |
| * All rights reserved. |
| * |
| * 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 AUTHOR 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 AUTHOR 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. |
| * |
| * $FreeBSD: src/lib/msun/amd64/fenv.c,v 1.3 2005/03/16 19:03:45 das Exp $ |
| */ |
| |
| #include <sys/cdefs.h> |
| #include <sys/types.h> |
| #include <machine/fpu.h> |
| #include <fenv.h> |
| |
| const fenv_t __fe_dfl_env = { |
| { 0xffff0000 | __INITIAL_FPUCW__, |
| 0xffff0000, |
| 0xffffffff, |
| { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff } |
| }, |
| __INITIAL_MXCSR__ |
| }; |
| |
| int |
| fesetexceptflag(const fexcept_t *flagp, int excepts) |
| { |
| fenv_t env; |
| |
| __fnstenv(&env.__x87); |
| env.__x87.__status &= ~excepts; |
| env.__x87.__status |= *flagp & excepts; |
| __fldenv(env.__x87); |
| |
| __stmxcsr(&env.__mxcsr); |
| env.__mxcsr &= ~excepts; |
| env.__mxcsr |= *flagp & excepts; |
| __ldmxcsr(env.__mxcsr); |
| |
| return (0); |
| } |
| |
| int |
| feraiseexcept(int excepts) |
| { |
| fexcept_t ex = excepts; |
| |
| fesetexceptflag(&ex, excepts); |
| __fwait(); |
| return (0); |
| } |
| |
| int |
| fegetenv(fenv_t *envp) |
| { |
| int control; |
| |
| /* |
| * fnstenv masks all exceptions, so we need to save and |
| * restore the control word to avoid this side effect. |
| */ |
| __fnstcw(&control); |
| __fnstenv(&envp->__x87); |
| __stmxcsr(&envp->__mxcsr); |
| __fldcw(control); |
| return (0); |
| } |
| |
| int |
| feholdexcept(fenv_t *envp) |
| { |
| int mxcsr; |
| |
| __stmxcsr(&mxcsr); |
| __fnstenv(&envp->__x87); |
| __fnclex(); |
| envp->__mxcsr = mxcsr; |
| mxcsr &= ~FE_ALL_EXCEPT; |
| mxcsr |= FE_ALL_EXCEPT << _SSE_EMASK_SHIFT; |
| __ldmxcsr(mxcsr); |
| return (0); |
| } |
| |
| int |
| feupdateenv(const fenv_t *envp) |
| { |
| int mxcsr, status; |
| |
| __fnstsw(&status); |
| __stmxcsr(&mxcsr); |
| fesetenv(envp); |
| feraiseexcept((mxcsr | status) & FE_ALL_EXCEPT); |
| return (0); |
| } |
| |
| int |
| __feenableexcept(int mask) |
| { |
| int mxcsr, control, omask; |
| |
| mask &= FE_ALL_EXCEPT; |
| __fnstcw(&control); |
| __stmxcsr(&mxcsr); |
| omask = (control | mxcsr >> _SSE_EMASK_SHIFT) & FE_ALL_EXCEPT; |
| control &= ~mask; |
| __fldcw(control); |
| mxcsr &= ~(mask << _SSE_EMASK_SHIFT); |
| __ldmxcsr(mxcsr); |
| return (~omask); |
| } |
| |
| int |
| __fedisableexcept(int mask) |
| { |
| int mxcsr, control, omask; |
| |
| mask &= FE_ALL_EXCEPT; |
| __fnstcw(&control); |
| __stmxcsr(&mxcsr); |
| omask = (control | mxcsr >> _SSE_EMASK_SHIFT) & FE_ALL_EXCEPT; |
| control |= mask; |
| __fldcw(control); |
| mxcsr |= mask << _SSE_EMASK_SHIFT; |
| __ldmxcsr(mxcsr); |
| return (~omask); |
| } |
| |
| __weak_reference(__feenableexcept, feenableexcept); |
| __weak_reference(__fedisableexcept, fedisableexcept); |