1 /*
2 * Copyright (C) 2022 The Android Open Source Project
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 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <fenv.h>
30 #include <stdint.h>
31
32 const fenv_t __fe_dfl_env = 0;
33
fegetenv(fenv_t * envp)34 int fegetenv(fenv_t* envp) {
35 __asm__ __volatile__("frcsr %0" : "=r"(*envp));
36 return 0;
37 }
38
fesetenv(const fenv_t * envp)39 int fesetenv(const fenv_t* envp) {
40 fenv_t env;
41 fegetenv(&env);
42 if (*envp != env) {
43 __asm__ __volatile__("fscsr %z0" : : "r"(*envp));
44 }
45 return 0;
46 }
47
feclearexcept(int excepts)48 int feclearexcept(int excepts) {
49 __asm__ __volatile__("csrc fflags, %0" : : "r"(excepts & FE_ALL_EXCEPT));
50 return 0;
51 }
52
fegetexceptflag(fexcept_t * flagp,int excepts)53 int fegetexceptflag(fexcept_t* flagp, int excepts) {
54 *flagp = fetestexcept(excepts & FE_ALL_EXCEPT);
55 return 0;
56 }
57
fesetexceptflag(const fexcept_t * flagp,int excepts)58 int fesetexceptflag(const fexcept_t* flagp, int excepts) {
59 feclearexcept((~*flagp) & excepts);
60 feraiseexcept(*flagp & excepts);
61 return 0;
62 }
63
feraiseexcept(int excepts)64 int feraiseexcept(int excepts) {
65 __asm__ __volatile__("csrs fflags, %0" : : "r"(excepts));
66 return 0;
67 }
68
fetestexcept(int excepts)69 int fetestexcept(int excepts) {
70 int flags;
71 __asm__ __volatile__("frflags %0" : "=r"(flags));
72 return flags & excepts;
73 }
74
fegetround(void)75 int fegetround(void) {
76 int rm;
77 __asm__ __volatile__("frrm %0" : "=r"(rm));
78 return rm;
79 }
80
fesetround(int round)81 int fesetround(int round) {
82 if (round < FE_TONEAREST || round > FE_UPWARD) return -1;
83 __asm__ __volatile__("fsrm %z0" : : "r"(round));
84 return 0;
85 }
86
feholdexcept(fenv_t * envp)87 int feholdexcept(fenv_t* envp) {
88 fegetenv(envp);
89 feclearexcept(FE_ALL_EXCEPT);
90 return 0;
91 }
92
feupdateenv(const fenv_t * envp)93 int feupdateenv(const fenv_t* envp) {
94 int excepts = fetestexcept(FE_ALL_EXCEPT);
95 fesetenv(envp);
96 feraiseexcept(excepts);
97 return 0;
98 }
99
feenableexcept(int mask __unused)100 int feenableexcept(int mask __unused) {
101 return -1;
102 }
103
fedisableexcept(int mask __unused)104 int fedisableexcept(int mask __unused) {
105 return 0;
106 }
107
fegetexcept(void)108 int fegetexcept(void) {
109 return 0;
110 }
111