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author | Andreas Jaeger <aj@suse.de> | 2000-08-21 17:06:46 +0000 |
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committer | Andreas Jaeger <aj@suse.de> | 2000-08-21 17:06:46 +0000 |
commit | 528be9fe8e08d78481d681c9ce23af6ba60ed2f5 (patch) | |
tree | 6f267c451b3390f3605f12de48f421166302cd0d /sysdeps/s390/fpu/fesetenv.c | |
parent | b7d2cec07113b7161a99f0fe8ee6234625984fce (diff) | |
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Add sys/procfs.h.
Diffstat (limited to 'sysdeps/s390/fpu/fesetenv.c')
-rw-r--r-- | sysdeps/s390/fpu/fesetenv.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/sysdeps/s390/fpu/fesetenv.c b/sysdeps/s390/fpu/fesetenv.c new file mode 100644 index 0000000000..93c97a32ef --- /dev/null +++ b/sysdeps/s390/fpu/fesetenv.c @@ -0,0 +1,56 @@ +/* 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; +} |