diff options
Diffstat (limited to 'ports/sysdeps/hppa/fpu/feholdexcpt.c')
| -rw-r--r-- | ports/sysdeps/hppa/fpu/feholdexcpt.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/ports/sysdeps/hppa/fpu/feholdexcpt.c b/ports/sysdeps/hppa/fpu/feholdexcpt.c new file mode 100644 index 0000000000..6e3cabd88a --- /dev/null +++ b/ports/sysdeps/hppa/fpu/feholdexcpt.c @@ -0,0 +1,54 @@ +/* Store current floating-point environment and clear exceptions. + Copyright (C) 2000 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by David Huggins-Daines <dhd@debian.org>, 2000 + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library. If not, see + <http://www.gnu.org/licenses/>. */ + +#include <fenv.h> +#include <string.h> + +int +feholdexcept (fenv_t *envp) +{ + union { unsigned long long buf[4]; fenv_t env; } clear; + unsigned long long *bufptr; + + /* Store the environment. */ + bufptr = clear.buf; + __asm__ ( + "fstd,ma %%fr0,8(%1)\n" + : "=m" (clear), "+r" (bufptr) : : "%r0"); + memcpy (envp, &clear.env, sizeof (fenv_t)); + + /* Clear exception queues */ + memset (clear.env.__exception, 0, sizeof (clear.env.__exception)); + /* And set all exceptions to non-stop. */ + clear.env.__status_word &= ~FE_ALL_EXCEPT; + /* Now clear all flags */ + clear.env.__status_word &= ~(FE_ALL_EXCEPT << 27); + + /* Load the new environment. Note: fr0 must load last to enable T-bit + Thus we start bufptr at the end and work backwards */ + bufptr = (unsigned int)(clear.buf) + sizeof(unsigned int)*4; + __asm__ ( + "fldd,mb -8(%0),%%fr0\n" + : : "r" (bufptr), "m" (clear) : "%r0"); + + return 0; +} + +libm_hidden_def (feholdexcept) + |