1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2004 David Schultz <das@FreeBSD.ORG>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #define __fenv_static
30 #include "fenv.h"
31 #ifdef __SPE__
32 #include <sys/types.h>
33 #include <machine/spr.h>
34 #endif
35
36 #ifdef __GNUC_GNU_INLINE__
37 #error "This file must be compiled with C99 'inline' semantics"
38 #endif
39
40 #ifdef __SPE__
41 const fenv_t __fe_dfl_env = SPEFSCR_DFLT;
42 #else
43 const fenv_t __fe_dfl_env = 0x00000000;
44 #endif
45
46 extern inline int feclearexcept(int __excepts);
47 extern inline int fegetexceptflag(fexcept_t *__flagp, int __excepts);
48 extern inline int fesetexceptflag(const fexcept_t *__flagp, int __excepts);
49 #ifndef __SPE__
50 extern inline int feraiseexcept(int __excepts);
51 #endif
52 extern inline int fetestexcept(int __excepts);
53 extern inline int fegetround(void);
54 extern inline int fesetround(int __round);
55 extern inline int fegetenv(fenv_t *__envp);
56 extern inline int feholdexcept(fenv_t *__envp);
57 extern inline int fesetenv(const fenv_t *__envp);
58 extern inline int feupdateenv(const fenv_t *__envp);
59 extern inline int feenableexcept(int __mask);
60 extern inline int fedisableexcept(int __mask);
61
62 #ifdef __SPE__
63 #define PMAX 0x7f7fffff
64 #define PMIN 0x00800000
feraiseexcept(int __excepts)65 int feraiseexcept(int __excepts)
66 {
67 uint32_t spefscr;
68
69 spefscr = mfspr(SPR_SPEFSCR);
70 mtspr(SPR_SPEFSCR, spefscr | (__excepts & FE_ALL_EXCEPT));
71
72 if (__excepts & FE_INVALID)
73 __asm __volatile ("efsdiv %0, %0, %1" :: "r"(0), "r"(0));
74 if (__excepts & FE_DIVBYZERO)
75 __asm __volatile ("efsdiv %0, %0, %1" :: "r"(1.0f), "r"(0));
76 if (__excepts & FE_UNDERFLOW)
77 __asm __volatile ("efsmul %0, %0, %0" :: "r"(PMIN));
78 if (__excepts & FE_OVERFLOW)
79 __asm __volatile ("efsadd %0, %0, %0" :: "r"(PMAX));
80 if (__excepts & FE_INEXACT)
81 __asm __volatile ("efssub %0, %0, %1" :: "r"(PMIN), "r"(1.0f));
82 return (0);
83 }
84 #endif
85