-/* Copyright (C) 2003 Free Software Foundation, Inc.
+/* Copyright (C) 2003-2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>
and Richard Henderson <rth@redhat.com>, 2003.
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
#include <setjmp.h>
+#include <stdio.h>
#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
#include "pthreadP.h"
-
-
-#ifdef HAVE_FORCED_UNWIND
+#include <jmpbuf-unwind.h>
+
+#ifdef _STACK_GROWS_DOWN
+# define FRAME_LEFT(frame, other, adj) \
+ ((uintptr_t) frame - adj >= (uintptr_t) other - adj)
+#elif _STACK_GROWS_UP
+# define FRAME_LEFT(frame, other, adj) \
+ ((uintptr_t) frame - adj <= (uintptr_t) other - adj)
+#else
+# error "Define either _STACK_GROWS_DOWN or _STACK_GROWS_UP"
+#endif
static _Unwind_Reason_Code
unwind_stop (int version, _Unwind_Action actions,
struct _Unwind_Context *context, void *stop_parameter)
{
struct pthread_unwind_buf *buf = stop_parameter;
+ struct pthread *self = THREAD_SELF;
+ struct _pthread_cleanup_buffer *curp = THREAD_GETMEM (self, cleanup);
+ int do_longjump = 0;
+
+ /* Adjust all pointers used in comparisons, so that top of thread's
+ stack is at the top of address space. Without that, things break
+ if stack is allocated above the main stack. */
+ uintptr_t adj = (uintptr_t) self->stackblock + self->stackblock_size;
/* Do longjmp if we're at "end of stack", aka "end of unwind data".
We assume there are only C frame without unwind data in between
of a function is NOT within it's stack frame; it's the SP of the
previous frame. */
if ((actions & _UA_END_OF_STACK)
- || ! _JMPBUF_UNWINDS (buf->cancel_jmp_buf[0].jmp_buf,
- _Unwind_GetCFA (context)))
- __libc_longjmp ((struct __jmp_buf_tag *) buf->cancel_jmp_buf, 1);
+ || ! _JMPBUF_CFA_UNWINDS_ADJ (buf->cancel_jmp_buf[0].jmp_buf, context,
+ adj))
+ do_longjump = 1;
+
+ if (__glibc_unlikely (curp != NULL))
+ {
+ /* Handle the compatibility stuff. Execute all handlers
+ registered with the old method which would be unwound by this
+ step. */
+ struct _pthread_cleanup_buffer *oldp = buf->priv.data.cleanup;
+ void *cfa = (void *) (_Unwind_Ptr) _Unwind_GetCFA (context);
+
+ if (curp != oldp && (do_longjump || FRAME_LEFT (cfa, curp, adj)))
+ {
+ do
+ {
+ /* Pointer to the next element. */
+ struct _pthread_cleanup_buffer *nextp = curp->__prev;
+
+ /* Call the handler. */
+ curp->__routine (curp->__arg);
+
+ /* To the next. */
+ curp = nextp;
+ }
+ while (curp != oldp
+ && (do_longjump || FRAME_LEFT (cfa, curp, adj)));
+
+ /* Mark the current element as handled. */
+ THREAD_SETMEM (self, cleanup, curp);
+ }
+ }
+
+ if (do_longjump)
+ __libc_unwind_longjmp ((struct __jmp_buf_tag *) buf->cancel_jmp_buf, 1);
return _URC_NO_REASON;
}
static void
unwind_cleanup (_Unwind_Reason_Code reason, struct _Unwind_Exception *exc)
{
- /* Nothing to do. */
+ /* When we get here a C++ catch block didn't rethrow the object. We
+ cannot handle this case and therefore abort. */
+ __libc_fatal ("FATAL: exception not rethrown\n");
}
-#endif /* have forced unwind */
-
void
__cleanup_fct_attribute __attribute ((noreturn))
struct pthread_unwind_buf *ibuf = (struct pthread_unwind_buf *) buf;
struct pthread *self = THREAD_SELF;
- /* Handle the compatibility stuff first. Execute all handlers
- registered with the old method. We don't execute them in order,
- instead, they will run first. */
- struct _pthread_cleanup_buffer *oldp = ibuf->priv.data.cleanup;
- struct _pthread_cleanup_buffer *curp = THREAD_GETMEM (self, cleanup);
-
- if (curp != oldp)
- {
- do
- {
- /* Pointer to the next element. */
- struct _pthread_cleanup_buffer *nextp = curp->__prev;
-
- /* Call the handler. */
- curp->__routine (curp->__arg);
-
- /* To the next. */
- curp = nextp;
- }
- while (curp != oldp);
-
- /* Mark the current element as handled. */
- THREAD_SETMEM (self, cleanup, curp);
- }
-
-#ifdef HAVE_FORCED_UNWIND
/* This is not a catchable exception, so don't provide any details about
the exception type. We do need to initialize the field though. */
THREAD_SETMEM (self, exc.exception_class, 0);
- THREAD_SETMEM (self, exc.exception_cleanup, unwind_cleanup);
+ THREAD_SETMEM (self, exc.exception_cleanup, &unwind_cleanup);
_Unwind_ForcedUnwind (&self->exc, unwind_stop, ibuf);
-#else
- /* We simply jump to the registered setjmp buffer. */
- __libc_longjmp ((struct __jmp_buf_tag *) ibuf->cancel_jmp_buf, 1);
-#endif
/* NOTREACHED */
/* We better do not get here. */
abort ();
}
+hidden_def (__pthread_unwind)
void
{
struct pthread_unwind_buf *ibuf = (struct pthread_unwind_buf *) buf;
- __pthread_unwind (ibuf->priv.data.prev);
+ __pthread_unwind ((__pthread_unwind_buf_t *) ibuf->priv.data.prev);
}
+hidden_def (__pthread_unwind_next)
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