* sysdeps/s390/fpu/fegetenv.c (fegetenv): Remove PTRACE_PEEKUSER

	ptrace call to get the ieee_instruction_pointer from the kernel.
	* sysdeps/s390/fpu/fesetenv.c (fesetenv): Remove PTRACE_POKEUSER
	ptrace call to set the ieee_instructtion_pointer.
	* sysdeps/unix/sysv/linux/s390/sys/user.h (struct _user_regs_struct):
	Add comment that ieee_instruction_pointer is always 0.

2 files changed, 2 insertions, 16 deletions

diff --git a/sysdeps/s390/fpu/fegetenv.c b/sysdeps/s390/fpu/fegetenv.c
index b35a76a4e8..a244f2ca8b 100644
--- a/sysdeps/s390/fpu/fegetenv.c
+++ b/sysdeps/s390/fpu/fegetenv.c
@@ -1,5 +1,5 @@
 /* Store current floating-point environment.
-   Copyright (C) 2000, 2003 Free Software Foundation, Inc.
+   Copyright (C) 2000, 2008 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Denis Joseph Barrow (djbarrow@de.ibm.com).
 
@@ -28,15 +28,7 @@
 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 =
-    (void *) ptrace (PTRACE_PEEKUSER, getpid (), PT_IEEE_IP);
 
   /* Success.  */
   return 0;
diff --git a/sysdeps/s390/fpu/fesetenv.c b/sysdeps/s390/fpu/fesetenv.c
index bb71c95a1e..82555c4948 100644
--- a/sysdeps/s390/fpu/fesetenv.c
+++ b/sysdeps/s390/fpu/fesetenv.c
@@ -1,5 +1,5 @@
 /* Install given floating-point environment.
-   Copyright (C) 2000, 2002 Free Software Foundation, Inc.
+   Copyright (C) 2000, 2008 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Denis Joseph Barrow (djbarrow@de.ibm.com).
 
@@ -43,13 +43,7 @@ fesetenv (const fenv_t *envp)
   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;