1 /* Procedure definition for FE_MASK_ENV for Linux/ppc.
2 Copyright (C) 2007 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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 <http://www.gnu.org/licenses/>. */
24 #include <sys/prctl.h>
25 #include <kernel-features.h>
27 #if __ASSUME_NEW_PRCTL_SYSCALL == 0
28 /* This is rather fiddly under Linux. We don't have direct access,
29 and there is no system call, but we can change the bits
30 in a signal handler's context... */
32 static struct sigaction oact
;
35 fe_mask_handler (int signum
, struct sigcontext
*sc
)
37 sc
->regs
->msr
&= ~0x900ul
; /* FE0 | FE1 */
38 sigaction (SIGUSR1
, &oact
, NULL
);
45 #if __ASSUME_NEW_PRCTL_SYSCALL == 0
46 # if defined PR_SET_FPEXC && defined PR_FP_EXC_DISABLED
47 int result
= INLINE_SYSCALL (prctl
, 2, PR_SET_FPEXC
, PR_FP_EXC_DISABLED
);
49 if (result
== -1 && errno
== EINVAL
)
54 act
.sa_handler
= (sighandler_t
) fe_mask_handler
;
55 sigemptyset (&act
.sa_mask
);
58 sigaction (SIGUSR1
, &act
, &oact
);
62 INTERNAL_SYSCALL_DECL (err
);
63 INTERNAL_SYSCALL (prctl
, err
, 2, PR_SET_FPEXC
, PR_FP_EXC_DISABLED
);