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Mark __dso_handle as hidden [BZ #18822]

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Since __dso_handle is always defined by either crtbegin.o from GCC or
dso_handle.c, it should be marked as hidden and be passed directly.

	[BZ #18822]
	* dlfcn/modatexit.c (foo): Remove __dso_handle check.
	* dlfcn/modcxaatexit.c: Include <dso_handle.h>.
	(__dso_handle): Remove declaration.
	* dlfcn/tstatexit.c (__dso_handle): Removed.
	(main): Don't check __dso_handle.
	* dlfcn/tstcxaatexit.c (__dso_handle): Removed.
	(main): Don't check __dso_handle.
	* include/dso_handle.h: New file.
	* malloc/mtrace.c: Include <dso_handle.h>.
	(mtrace): Pass __dso_handle directly.
	* nptl/pthread_atfork.c: Include <dso_handle.h>.
	(__dso_handle): Remove declaration.
	(__pthread_atfork): Pass __dso_handle directly.
	* nptl/tst-atfork2mod.c: Include <dso_handle.h>.
	(__dso_handle): Removed.
	* posix/wordexp-test.c: Include <dso_handle.h>.
	(__dso_handle): Remove declaration.
	(__app_register_atfork): Pass __dso_handle directly.
	* stdlib/at_quick_exit.c: Include <dso_handle.h>.
	(__dso_handle): Remove declaration.
	(at_quick_exit): Pass __dso_handle directly.
	* stdlib/atexit.c: Include <dso_handle.h>.
	(__dso_handle): Remove declaration.
	(atexit): Pass __dso_handle directly.
	* stdlib/tst-tls-atexit-lib.c: Include <dso_handle.h>.
	(__dso_handle): Removed.
This commit is contained in:
H.J. Lu 2017-09-26 16:53:25 -07:00
parent bfb0deb355
commit 825adeeed1
13 changed files with 46 additions and 46 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
ChangeLog
View File

@ -1,3 +1,33 @@
2017-09-26 H.J. Lu <hongjiu.lu@intel.com>
[BZ #18822]
* dlfcn/modatexit.c (foo): Remove __dso_handle check.
* dlfcn/modcxaatexit.c: Include <dso_handle.h>.
(__dso_handle): Remove declaration.
* dlfcn/tstatexit.c (__dso_handle): Removed.
(main): Don't check __dso_handle.
* dlfcn/tstcxaatexit.c (__dso_handle): Removed.
(main): Don't check __dso_handle.
* include/dso_handle.h: New file.
* malloc/mtrace.c: Include <dso_handle.h>.
(mtrace): Pass __dso_handle directly.
* nptl/pthread_atfork.c: Include <dso_handle.h>.
(__dso_handle): Remove declaration.
(__pthread_atfork): Pass __dso_handle directly.
* nptl/tst-atfork2mod.c: Include <dso_handle.h>.
(__dso_handle): Removed.
* posix/wordexp-test.c: Include <dso_handle.h>.
(__dso_handle): Remove declaration.
(__app_register_atfork): Pass __dso_handle directly.
* stdlib/at_quick_exit.c: Include <dso_handle.h>.
(__dso_handle): Remove declaration.
(at_quick_exit): Pass __dso_handle directly.
* stdlib/atexit.c: Include <dso_handle.h>.
(__dso_handle): Remove declaration.
(atexit): Pass __dso_handle directly.
* stdlib/tst-tls-atexit-lib.c: Include <dso_handle.h>.
(__dso_handle): Removed.
2017-09-26 Joseph Myers <joseph@codesourcery.com>
* sysdeps/unix/make-syscalls.sh: Use __ifunc to define symbols

2
dlfcn/modatexit.c
View File

@ -35,9 +35,7 @@ dummy (void)
void
foo (void *p)
{
extern void *__dso_handle __attribute__ ((__weak__));
printf ("This is %s\n", __FUNCTION__);
atexit (dummy);
if (&__dso_handle) puts ("have dso handle"); else puts ("no dso handle");
ip = p;
}

2
dlfcn/modcxaatexit.c
View File

@ -17,6 +17,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <dso_handle.h>
extern void fluffy (void *p);
extern void bar (void *p);
@ -34,7 +35,6 @@ fluffy (void *p)
void
bar (void *p)
{
extern void *__dso_handle;
printf ("This is %s\n", __FUNCTION__);
__cxa_atexit (fluffy, p, __dso_handle);
}

8
dlfcn/tstatexit.c
View File

@ -20,8 +20,6 @@
#include <stdlib.h>
extern void *__dso_handle __attribute__ ((__weak__));
int
main (void)
{
@ -30,12 +28,6 @@ main (void)
void (*fp) (void *);
int v = 0;
if (&__dso_handle == NULL)
{
puts ("__dso_handle not available, cannot perform the test");
exit (0);
}
h = dlopen (fname, RTLD_NOW);
if (h == NULL)
{

8
dlfcn/tstcxaatexit.c
View File

@ -19,8 +19,6 @@
#include <stdio.h>
#include <stdlib.h>
extern void *__dso_handle __attribute__ ((__weak__));
int
main (void)
{
@ -29,12 +27,6 @@ main (void)
void (*fp) (void *);
int v = 0;
if (&__dso_handle == NULL)
{
puts ("__dso_handle not available, cannot perform the test");
exit (0);
}
h = dlopen (fname, RTLD_LAZY);
if (h == NULL)
{

3
include/dso_handle.h Normal file
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@ -0,0 +1,3 @@
/* __dso_handle is always defined by either crtbegin.o from GCC or our
dso_handle.c. */
extern void *__dso_handle __attribute__ ((__visibility__ ("hidden")));

4
malloc/mtrace.c
View File

@ -34,6 +34,7 @@
#include <_itoa.h>
#include <libc-internal.h>
#include <dso_handle.h>
#include <libio/iolibio.h>
#define setvbuf(s, b, f, l) _IO_setvbuf (s, b, f, l)
@ -315,10 +316,9 @@ mtrace (void)
#ifdef _LIBC
if (!added_atexit_handler)
{
extern void *__dso_handle __attribute__ ((__weak__));
added_atexit_handler = 1;
__cxa_atexit ((void (*)(void *))release_libc_mem, NULL,
&__dso_handle ? __dso_handle : NULL);
__dso_handle);
}
#endif
}

8
nptl/pthread_atfork.c
View File

@ -35,10 +35,7 @@
#include "pthreadP.h"
#include <fork.h>
/* This is defined by newer gcc version unique for each module. */
extern void *__dso_handle __attribute__ ((__weak__,
__visibility__ ("hidden")));
#include <dso_handle.h>
/* Hide the symbol so that no definition but the one locally in the
@ -51,8 +48,7 @@ attribute_hidden
__pthread_atfork (void (*prepare) (void), void (*parent) (void),
void (*child) (void))
{
return __register_atfork (prepare, parent, child,
&__dso_handle == NULL ? NULL : __dso_handle);
return __register_atfork (prepare, parent, child, __dso_handle);
}
#ifndef __pthread_atfork
extern int pthread_atfork (void (*prepare) (void), void (*parent) (void),

2
nptl/tst-atfork2mod.c
View File

@ -19,6 +19,7 @@
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <dso_handle.h>
extern int val;
@ -46,7 +47,6 @@ static void
__attribute__ ((constructor))
init (void)
{
extern void *__dso_handle;
printf ("dsohandle = %p\n", __dso_handle);
if (pthread_atfork (prepare, parent, child) != 0)

5
posix/wordexp-test.c
View File

@ -27,16 +27,15 @@
#include <string.h>
#include <wordexp.h>
#include <libc-pointer-arith.h>
#include <dso_handle.h>
#define IFS " \n\t"
extern void *__dso_handle __attribute__ ((__weak__, __visibility__ ("hidden")));
extern int __register_atfork (void (*) (void), void (*) (void), void (*) (void), void *);
static int __app_register_atfork (void (*prepare) (void), void (*parent) (void), void (*child) (void))
{
return __register_atfork (prepare, parent, child,
&__dso_handle == NULL ? NULL : __dso_handle);
return __register_atfork (prepare, parent, child, __dso_handle);
}
/* Number of forks seen. */

8
stdlib/at_quick_exit.c
View File

@ -33,18 +33,14 @@
<http://www.gnu.org/licenses/>. */
#include <stdlib.h>
#include <dso_handle.h>
#include "exit.h"
/* This is defined by newer gcc version unique for each module. */
extern void *__dso_handle __attribute__ ((__weak__));
/* Register FUNC to be executed by `quick_exit'. */
int
attribute_hidden
at_quick_exit (void (*func) (void))
{
return __cxa_at_quick_exit ((void (*) (void *)) func,
&__dso_handle == NULL ? NULL : __dso_handle);
return __cxa_at_quick_exit ((void (*) (void *)) func, __dso_handle);
}

9
stdlib/atexit.c
View File

@ -33,13 +33,9 @@
<http://www.gnu.org/licenses/>. */
#include <stdlib.h>
#include <dso_handle.h>
#include "exit.h"
/* This is defined by newer gcc version unique for each module. */
extern void *__dso_handle __attribute__ ((__weak__));
/* Register FUNC to be executed by `exit'. */
int
#ifndef atexit
@ -47,6 +43,5 @@ attribute_hidden
#endif
atexit (void (*func) (void))
{
return __cxa_atexit ((void (*) (void *)) func, NULL,
&__dso_handle == NULL ? NULL : __dso_handle);
return __cxa_atexit ((void (*) (void *)) func, NULL, __dso_handle);
}

3
stdlib/tst-tls-atexit-lib.c
View File

@ -17,8 +17,7 @@
<http://www.gnu.org/licenses/>. */
#include <stdlib.h>
extern void *__dso_handle;
#include <dso_handle.h>
typedef struct
{