mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-30 00:31:08 +00:00
41bdb6e20c
2001-07-06 Paul Eggert <eggert@twinsun.com> * manual/argp.texi: Remove ignored LGPL copyright notice; it's not appropriate for documentation anyway. * manual/libc-texinfo.sh: "Library General Public License" -> "Lesser General Public License". 2001-07-06 Andreas Jaeger <aj@suse.de> * All files under GPL/LGPL version 2: Place under LGPL version 2.1.
44 lines
1.7 KiB
C
44 lines
1.7 KiB
C
/* Store current floating-point environment.
|
|
Copyright (C) 2000 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Denis Joseph Barrow (djbarrow@de.ibm.com).
|
|
|
|
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, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <fenv_libc.h>
|
|
#include <fpu_control.h>
|
|
#include <stddef.h>
|
|
#include <asm/ptrace.h>
|
|
#include <sys/ptrace.h>
|
|
#include <unistd.h>
|
|
|
|
int
|
|
fegetenv (fenv_t *envp)
|
|
{
|
|
/* The S/390 IEEE fpu doesn't keep track of the ieee instruction pointer.
|
|
To get around that the kernel will store the address of the last
|
|
fpu fault to the process structure. This ptrace call reads this value
|
|
from the kernel space. That means the ieee_instruction_pointer is
|
|
only correct after a fpu fault. That's the best we can do, there is
|
|
no way to find out the ieee instruction pointer if there was no fault. */
|
|
_FPU_GETCW (envp->fpc);
|
|
envp->ieee_instruction_pointer =
|
|
ptrace (PTRACE_PEEKUSER, getpid (), PT_IEEE_IP);
|
|
|
|
/* Success. */
|
|
return 0;
|
|
}
|