1 | /* Install given floating-point environment. |
2 | Copyright (C) 1997-2024 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library. If not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <fenv.h> |
20 | |
21 | int |
22 | __fesetenv (const fenv_t *envp) |
23 | { |
24 | fenv_t temp; |
25 | |
26 | /* Install the environment specified by ENVP. But there are a few |
27 | values which we do not want to come from the saved environment. |
28 | Therefore, we get the current environment and replace the values |
29 | we want to use from the environment specified by the parameter. */ |
30 | #ifdef __mcoldfire__ |
31 | __asm__ ("fmove%.l %/fpcr,%0" : "=dm" (temp.__control_register)); |
32 | __asm__ ("fmove%.l %/fpsr,%0" : "=dm" (temp.__status_register)); |
33 | __asm__ ("fmove%.l %/fpiar,%0" : "=dm" (temp.__instruction_address)); |
34 | #else |
35 | __asm__ ("fmovem%.l %/fpcr/%/fpsr/%/fpiar,%0" : "=m" (*&temp)); |
36 | #endif |
37 | |
38 | temp.__status_register &= ~FE_ALL_EXCEPT; |
39 | temp.__control_register &= ~((FE_ALL_EXCEPT << 6) | FE_UPWARD); |
40 | if (envp == FE_DFL_ENV) |
41 | ; |
42 | else if (envp == FE_NOMASK_ENV) |
43 | temp.__control_register |= FE_ALL_EXCEPT << 6; |
44 | else |
45 | { |
46 | temp.__control_register |= (envp->__control_register |
47 | & ((FE_ALL_EXCEPT << 6) | FE_UPWARD)); |
48 | temp.__status_register |= envp->__status_register & FE_ALL_EXCEPT; |
49 | } |
50 | |
51 | #ifdef __mcoldfire__ |
52 | __asm__ __volatile__ ("fmove%.l %0,%/fpiar" |
53 | :: "dm" (temp.__instruction_address)); |
54 | __asm__ __volatile__ ("fmove%.l %0,%/fpcr" |
55 | :: "dm" (temp.__control_register)); |
56 | __asm__ __volatile__ ("fmove%.l %0,%/fpsr" |
57 | :: "dm" (temp.__status_register)); |
58 | #else |
59 | __asm__ __volatile__ ("fmovem%.l %0,%/fpcr/%/fpsr/%/fpiar" : : "m" (*&temp)); |
60 | #endif |
61 | |
62 | /* Success. */ |
63 | return 0; |
64 | } |
65 | |
66 | #include <shlib-compat.h> |
67 | #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2) |
68 | strong_alias (__fesetenv, __old_fesetenv) |
69 | compat_symbol (libm, __old_fesetenv, fesetenv, GLIBC_2_1); |
70 | #endif |
71 | |
72 | libm_hidden_def (__fesetenv) |
73 | libm_hidden_ver (__fesetenv, fesetenv) |
74 | versioned_symbol (libm, __fesetenv, fesetenv, GLIBC_2_2); |
75 | |