| The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame^] | 1 | /*- |
| 2 | * Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG> |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * |
| 14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 15 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 18 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 22 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 23 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 24 | * SUCH DAMAGE. |
| 25 | * |
| 26 | * $FreeBSD: src/lib/msun/amd64/fenv.c,v 1.3 2005/03/16 19:03:45 das Exp $ |
| 27 | */ |
| 28 | |
| 29 | #include <sys/cdefs.h> |
| 30 | #include <sys/types.h> |
| 31 | #include <machine/fpu.h> |
| 32 | #include <fenv.h> |
| 33 | |
| 34 | const fenv_t __fe_dfl_env = { |
| 35 | { 0xffff0000 | __INITIAL_FPUCW__, |
| 36 | 0xffff0000, |
| 37 | 0xffffffff, |
| 38 | { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 39 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff } |
| 40 | }, |
| 41 | __INITIAL_MXCSR__ |
| 42 | }; |
| 43 | |
| 44 | int |
| 45 | fesetexceptflag(const fexcept_t *flagp, int excepts) |
| 46 | { |
| 47 | fenv_t env; |
| 48 | |
| 49 | __fnstenv(&env.__x87); |
| 50 | env.__x87.__status &= ~excepts; |
| 51 | env.__x87.__status |= *flagp & excepts; |
| 52 | __fldenv(env.__x87); |
| 53 | |
| 54 | __stmxcsr(&env.__mxcsr); |
| 55 | env.__mxcsr &= ~excepts; |
| 56 | env.__mxcsr |= *flagp & excepts; |
| 57 | __ldmxcsr(env.__mxcsr); |
| 58 | |
| 59 | return (0); |
| 60 | } |
| 61 | |
| 62 | int |
| 63 | feraiseexcept(int excepts) |
| 64 | { |
| 65 | fexcept_t ex = excepts; |
| 66 | |
| 67 | fesetexceptflag(&ex, excepts); |
| 68 | __fwait(); |
| 69 | return (0); |
| 70 | } |
| 71 | |
| 72 | int |
| 73 | fegetenv(fenv_t *envp) |
| 74 | { |
| 75 | int control; |
| 76 | |
| 77 | /* |
| 78 | * fnstenv masks all exceptions, so we need to save and |
| 79 | * restore the control word to avoid this side effect. |
| 80 | */ |
| 81 | __fnstcw(&control); |
| 82 | __fnstenv(&envp->__x87); |
| 83 | __stmxcsr(&envp->__mxcsr); |
| 84 | __fldcw(control); |
| 85 | return (0); |
| 86 | } |
| 87 | |
| 88 | int |
| 89 | feholdexcept(fenv_t *envp) |
| 90 | { |
| 91 | int mxcsr; |
| 92 | |
| 93 | __stmxcsr(&mxcsr); |
| 94 | __fnstenv(&envp->__x87); |
| 95 | __fnclex(); |
| 96 | envp->__mxcsr = mxcsr; |
| 97 | mxcsr &= ~FE_ALL_EXCEPT; |
| 98 | mxcsr |= FE_ALL_EXCEPT << _SSE_EMASK_SHIFT; |
| 99 | __ldmxcsr(mxcsr); |
| 100 | return (0); |
| 101 | } |
| 102 | |
| 103 | int |
| 104 | feupdateenv(const fenv_t *envp) |
| 105 | { |
| 106 | int mxcsr, status; |
| 107 | |
| 108 | __fnstsw(&status); |
| 109 | __stmxcsr(&mxcsr); |
| 110 | fesetenv(envp); |
| 111 | feraiseexcept((mxcsr | status) & FE_ALL_EXCEPT); |
| 112 | return (0); |
| 113 | } |
| 114 | |
| 115 | int |
| 116 | __feenableexcept(int mask) |
| 117 | { |
| 118 | int mxcsr, control, omask; |
| 119 | |
| 120 | mask &= FE_ALL_EXCEPT; |
| 121 | __fnstcw(&control); |
| 122 | __stmxcsr(&mxcsr); |
| 123 | omask = (control | mxcsr >> _SSE_EMASK_SHIFT) & FE_ALL_EXCEPT; |
| 124 | control &= ~mask; |
| 125 | __fldcw(control); |
| 126 | mxcsr &= ~(mask << _SSE_EMASK_SHIFT); |
| 127 | __ldmxcsr(mxcsr); |
| 128 | return (~omask); |
| 129 | } |
| 130 | |
| 131 | int |
| 132 | __fedisableexcept(int mask) |
| 133 | { |
| 134 | int mxcsr, control, omask; |
| 135 | |
| 136 | mask &= FE_ALL_EXCEPT; |
| 137 | __fnstcw(&control); |
| 138 | __stmxcsr(&mxcsr); |
| 139 | omask = (control | mxcsr >> _SSE_EMASK_SHIFT) & FE_ALL_EXCEPT; |
| 140 | control |= mask; |
| 141 | __fldcw(control); |
| 142 | mxcsr |= mask << _SSE_EMASK_SHIFT; |
| 143 | __ldmxcsr(mxcsr); |
| 144 | return (~omask); |
| 145 | } |
| 146 | |
| 147 | __weak_reference(__feenableexcept, feenableexcept); |
| 148 | __weak_reference(__fedisableexcept, fedisableexcept); |