mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-18 19:10:06 +00:00
57 lines
1.8 KiB
C
57 lines
1.8 KiB
C
/* Install given 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
|
|
fesetenv (const fenv_t *envp)
|
|
{
|
|
fenv_t env;
|
|
|
|
if (envp == FE_DFL_ENV)
|
|
{
|
|
env.fpc = _FPU_DEFAULT;
|
|
env.ieee_instruction_pointer = 0;
|
|
}
|
|
else if (envp == FE_NOMASK_ENV)
|
|
{
|
|
env.fpc = FPC_EXCEPTION_MASK;
|
|
env.ieee_instruction_pointer = 0;
|
|
}
|
|
else
|
|
env = (*envp);
|
|
|
|
/* The S/390 IEEE fpu doesn't have a register for the ieee
|
|
instruction pointer. The operating system is required to keep an
|
|
instruction pointer on a per process base. We read and write this
|
|
value with the ptrace interface. */
|
|
_FPU_SETCW (env.fpc);
|
|
ptrace (PTRACE_POKEUSER, getpid (), PT_IEEE_IP,
|
|
env.ieee_instruction_pointer);
|
|
|
|
/* Success. */
|
|
return 0;
|
|
}
|