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crtstuff.c (HIDDEN_DTOR_LIST_END): New macro.

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* crtstuff.c (HIDDEN_DTOR_LIST_END): New macro.
	(__do_global_dtors_aux): Use more paranoid loop to run
	destructors if HIDDEN_DTOR_LIST_END.
	(__DTOR_END__): Export as a hidden symbol when HIDDEN_DTOR_LIST_END.

Co-Authored-By: Jakub Jelinek <jakub@redhat.com>

From-SVN: r124444
This commit is contained in:
Ulrich Drepper 2007-05-04 19:20:28 +00:00 committed by Jakub Jelinek
parent 12aac30b21
commit 3fc95619f6
2 changed files with 49 additions and 9 deletions
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8
gcc/ChangeLog
View File

@ -1,3 +1,11 @@
2007-05-04 Ulrich Drepper <drepper@redhat.com>
Jakub Jelinek <jakub@redhat.com>
* crtstuff.c (HIDDEN_DTOR_LIST_END): New macro.
(__do_global_dtors_aux): Use more paranoid loop to run
destructors if HIDDEN_DTOR_LIST_END.
(__DTOR_END__): Export as a hidden symbol when HIDDEN_DTOR_LIST_END.
2007-05-04 Jakub Jelinek <jakub@redhat.com>
* varasm.c (align_variable): Don't increase alignment for

50
gcc/crtstuff.c
View File

@ -106,6 +106,11 @@ call_ ## FUNC (void) \
# define EH_FRAME_SECTION_CONST
#endif
#if !defined(DTOR_LIST_END) && defined(OBJECT_FORMAT_ELF) \
&& defined(HAVE_GAS_HIDDEN) && !defined(FINI_ARRAY_SECTION_ASM_OP)
# define HIDDEN_DTOR_LIST_END
#endif
/* We do not want to add the weak attribute to the declarations of these
routines in unwind-dw2-fde.h because that will cause the definition of
these symbols to be weak as well.
@ -265,10 +270,6 @@ extern void __cxa_finalize (void *) TARGET_ATTRIBUTE_WEAK;
static void __attribute__((used))
__do_global_dtors_aux (void)
{
#ifndef FINI_ARRAY_SECTION_ASM_OP
static func_ptr *p = __DTOR_LIST__ + 1;
func_ptr f;
#endif /* !defined(FINI_ARRAY_SECTION_ASM_OP) */
static _Bool completed;
if (__builtin_expect (completed, 0))
@ -282,12 +283,32 @@ __do_global_dtors_aux (void)
#ifdef FINI_ARRAY_SECTION_ASM_OP
/* If we are using .fini_array then destructors will be run via that
mechanism. */
#elif defined(HIDDEN_DTOR_LIST_END)
{
/* Safer version that makes sure only .dtors function pointers are
called even if the static variable is maliciously changed. */
extern func_ptr __DTOR_END__[] __attribute__((visibility ("hidden")));
static size_t dtor_idx;
const size_t max_idx = __DTOR_END__ - __DTOR_LIST__ - 1;
func_ptr f;
while (dtor_idx < max_idx)
{
f = __DTOR_LIST__[++dtor_idx];
f ();
}
}
#else /* !defined (FINI_ARRAY_SECTION_ASM_OP) */
while ((f = *p))
{
p++;
f ();
}
{
static func_ptr *p = __DTOR_LIST__ + 1;
func_ptr f;
while ((f = *p))
{
p++;
f ();
}
}
#endif /* !defined(FINI_ARRAY_SECTION_ASM_OP) */
#ifdef USE_EH_FRAME_REGISTRY
@ -471,6 +492,17 @@ STATIC func_ptr __CTOR_END__[1]
#ifdef DTOR_LIST_END
DTOR_LIST_END;
#elif defined(HIDDEN_DTOR_LIST_END)
#ifdef DTORS_SECTION_ASM_OP
asm (DTORS_SECTION_ASM_OP);
#endif
func_ptr __DTOR_END__[1]
__attribute__ ((unused,
#ifndef DTORS_SECTION_ASM_OP
section(".dtors"),
#endif
aligned(sizeof(func_ptr)), visibility ("hidden")))
= { (func_ptr) 0 };
#elif defined(DTORS_SECTION_ASM_OP)
asm (DTORS_SECTION_ASM_OP);
STATIC func_ptr __DTOR_END__[1]