1 /* Procedure definition for FE_NOMASK_ENV for Linux/ppc.
2 Copyright (C) 2000 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, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
25 #include <sys/prctl.h>
26 #include "kernel-features.h"
28 #if __ASSUME_NEW_PRCTL_SYSCALL == 0
29 /* This is rather fiddly under Linux. We don't have direct access,
30 and there is no system call, but we can change the bits
31 in a signal handler's context... */
33 static struct sigaction oact
;
36 fe_nomask_handler (int signum
, struct sigcontext
*sc
)
38 sc
->regs
->msr
|= 0x900ul
; /* FE0 | FE1 */
39 sigaction (SIGUSR1
, &oact
, NULL
);
44 __fe_nomask_env (void)
46 #if __ASSUME_NEW_PRCTL_SYSCALL == 0
47 # if defined PR_SET_FPEXC && defined PR_FP_EXC_PRECISE
48 int result
= INLINE_SYSCALL (prctl
, 2, PR_SET_FPEXC
, PR_FP_EXC_PRECISE
);
50 if (result
== -1 && errno
== EINVAL
)
55 act
.sa_handler
= (sighandler_t
) fe_nomask_handler
;
56 sigemptyset (&act
.sa_mask
);
59 sigaction (SIGUSR1
, &act
, &oact
);
63 INTERNAL_SYSCALL_DECL (err
);
64 INTERNAL_SYSCALL (prctl
, err
, 2, PR_SET_FPEXC
, PR_FP_EXC_PRECISE
);
67 return FE_ENABLED_ENV
;