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Clean up NPTL system to be compat-only.

This commit is contained in:
Roland McGrath 2015-02-06 10:53:38 -08:00
parent ec2a88b3c6
commit 8c28bbc6d9
2 changed files with 44 additions and 8 deletions
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4
ChangeLog
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@ -1,5 +1,9 @@
2015-02-06 Roland McGrath <roland@hack.frob.com>
* nptl/pt-system.c: Rewritten. Put everything under
[SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_22)].
Use IFUNC to redirect when possible.
* nptl/pt-longjmp.c: Rewritten. Put everything under
[SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_22)].
Use IFUNC to redirect when possible.

48
nptl/pt-system.c
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@ -1,4 +1,5 @@
/* Copyright (C) 2002-2015 Free Software Foundation, Inc.
/* ABI compatibility for 'system' symbol in libpthread ABI.
Copyright (C) 2002-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
@ -16,17 +17,48 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <stdlib.h>
#include <sysdep.h>
#include "pthreadP.h"
#include <shlib-compat.h>
/* libpthread once had its own 'system', though there was no apparent
reason for it. There is no use in having a separate symbol in
libpthread, but the historical ABI requires it. For static linking,
there is no need to provide anything here--the libc version will be
linked in. For shared library ABI compatibility, there must be a
'system' symbol in libpthread.so; so we define it using IFUNC to
redirect to the libc function. */
int
system (const char *line)
#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_22)
# if HAVE_IFUNC
static __typeof (system) *
__attribute__ ((used))
system_resolve (void)
{
return &__libc_system;
}
asm (".globl system_ifunc\n"
".type system_ifunc, %gnu_indirect_function");
# ifdef HAVE_ASM_SET_DIRECTIVE
asm (".set system_ifunc, system_resolve");
# else
asm ("system_ifunc = system_resolve");
# endif
# else /* !HAVE_IFUNC */
static int __attribute__ ((used))
system_compat (const char *line)
{
return __libc_system (line);
}
strong_alias (system_compat, system_ifunc)
/* __libc_system in libc.so handles cancellation. */
LIBC_CANCEL_HANDLED ();
# endif /* HAVE_IFUNC */
compat_symbol (libpthread, system_ifunc, system, GLIBC_2_0);
#endif