| 1 | /* Set floating-point environment exception handling. |
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| 2 | Copyright (C) 1997-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <fenv_libc.h> |
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| 20 | |
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| 21 | int |
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| 22 | __fesetexceptflag (const fexcept_t *flagp, int excepts) |
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| 23 | { |
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| 24 | fenv_union_t u, n; |
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| 25 | fexcept_t flag; |
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| 26 | |
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| 27 | /* Get the current state. */ |
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| 28 | u.fenv = fegetenv_register (); |
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| 29 | |
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| 30 | /* Ignore exceptions not listed in 'excepts'. */ |
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| 31 | flag = *flagp & excepts; |
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| 32 | |
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| 33 | /* Replace the exception status */ |
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| 34 | int excepts_mask = FPSCR_STICKY_BITS & excepts; |
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| 35 | if ((excepts & FE_INVALID) != 0) |
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| 36 | excepts_mask |= FE_ALL_INVALID; |
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| 37 | n.l = ((u.l & ~excepts_mask) |
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| 38 | | (flag & FPSCR_STICKY_BITS) |
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| 39 | /* Turn FE_INVALID into FE_INVALID_SOFTWARE. */ |
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| 40 | | (flag >> ((31 - FPSCR_VX) - (31 - FPSCR_VXSOFT)) |
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| 41 | & FE_INVALID_SOFTWARE)); |
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| 42 | |
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| 43 | /* Store the new status word (along with the rest of the environment). |
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| 44 | This may cause floating-point exceptions if the restored state |
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| 45 | requests it. */ |
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| 46 | if (n.l != u.l) |
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| 47 | { |
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| 48 | if (n.l & fenv_exceptions_to_reg (excepts)) |
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| 49 | /* Setting the exception flags may trigger a trap. ISO C 23 ยง 7.6.4.4 |
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| 50 | does not allow it. */ |
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| 51 | return -1; |
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| 52 | |
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| 53 | fesetenv_register (n.fenv); |
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| 54 | } |
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| 55 | |
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| 56 | /* Deal with FE_INVALID_SOFTWARE not being implemented on some chips. */ |
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| 57 | if (flag & FE_INVALID) |
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| 58 | feraiseexcept(FE_INVALID); |
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| 59 | |
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| 60 | /* Success. */ |
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| 61 | return 0; |
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| 62 | } |
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| 63 | |
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| 64 | #include <shlib-compat.h> |
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| 65 | #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2) |
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| 66 | strong_alias (__fesetexceptflag, __old_fesetexceptflag) |
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| 67 | compat_symbol (libm, __old_fesetexceptflag, fesetexceptflag, GLIBC_2_1); |
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| 68 | #endif |
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| 69 | |
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| 70 | versioned_symbol (libm, __fesetexceptflag, fesetexceptflag, GLIBC_2_2); |
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| 71 | |
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