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

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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.
This commit is contained in:
Ulrich Drepper 2008-03-24 20:01:15 +00:00
parent af0498dc95
commit 87b9b50f0d
4 changed files with 13 additions and 18 deletions
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9
ChangeLog
View File

@ -1,3 +1,12 @@
2008-03-07 Martin Schwidefsky <schwidefsky@de.ibm.com>
* 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.
2008-03-09 Andreas Jaeger <aj@suse.de>
[BZ #5857]

10
sysdeps/s390/fpu/fegetenv.c
View File

@ -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;

8
sysdeps/s390/fpu/fesetenv.c
View File

@ -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;

4
sysdeps/unix/sysv/linux/s390/sys/user.h
View File

@ -1,4 +1,4 @@
/* Copyright (C) 2000,2005 Free Software Foundation, Inc.
/* Copyright (C) 2000,2008 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -56,7 +56,7 @@ struct _user_regs_struct
unsigned long orig_gpr2; /* Original gpr2. */
struct _user_fpregs_struct fp_regs; /* Floating point registers. */
struct _user_per_struct per_info; /* Hardware tracing registers. */
unsigned long ieee_instruction_pointer;
unsigned long ieee_instruction_pointer; /* Always 0. */
};
struct user {