diff options
Diffstat (limited to 'sysdeps/s390/fpu/fegetenv.c')
-rw-r--r-- | sysdeps/s390/fpu/fegetenv.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/sysdeps/s390/fpu/fegetenv.c b/sysdeps/s390/fpu/fegetenv.c new file mode 100644 index 0000000000..4140a8b4fa --- /dev/null +++ b/sysdeps/s390/fpu/fegetenv.c @@ -0,0 +1,43 @@ +/* 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. 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; +} |