Update.

2004-01-08  Jakub Jelinek  <jakub@redhat.com>

	* sysdeps/unix/sysv/linux/x86_64/clone.S (__clone): Add cfi_endproc
	right before syscall and cfi_startproc before PSEUDO_END.
	Clear %rbp in thread_start.

ChangeLog

@@ -1,3 +1,9 @@
+2004-01-08  Jakub Jelinek  <jakub@redhat.com>
+
+	* sysdeps/unix/sysv/linux/x86_64/clone.S (__clone): Add cfi_endproc
+	right before syscall and cfi_startproc before PSEUDO_END.
+	Clear %rbp in thread_start.
+
 2004-01-05  Jakub Jelinek  <jakub@redhat.com>
 
 	* posix/regcomp.c (regcomp): Fix comment typo.

nptl/ChangeLog

@@ -1,3 +1,8 @@
+2004-01-08  Jakub Jelinek  <jakub@redhat.com>
+
+	* Makefile (tests): Add tst-backtrace1.
+	* tst-backtrace1.c: New test.
+
 2003-12-11  Ulrich Weigand  <uweigand@de.ibm.com>
 
 	* sysdeps/alpha/tls.h (DB_THREAD_SELF): Pass bit size of thread

nptl/Makefile

@@ -1,4 +1,4 @@
-# Copyright (C) 2002, 2003 Free Software Foundation, Inc.
+# Copyright (C) 2002, 2003, 2004 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
@@ -235,6 +235,7 @@ tests = tst-attr1 tst-attr2 tst-attr3 \
 	tst-clock1 tst-clock2 \
 	tst-context1 \
 	tst-sched1 \
+	tst-backtrace1 \
 	tst-oddstacklimit
 
 # This sets the stack resource limit to 1023kb, which is not a multiple

nptl/tst-backtrace1.c

@@ -0,0 +1,86 @@
+/* Copyright (C) 2004 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Jakub Jelinek <jakub@redhat.com>, 2004.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   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.  */
+
+#include <execinfo.h>
+#include <pthread.h>
+#include <stdio.h>
+
+#define BT_SIZE 64
+void *bt_array[BT_SIZE];
+int bt_cnt;
+
+int
+do_bt (void)
+{
+  bt_cnt = backtrace (bt_array, BT_SIZE);
+  return 56;
+}
+
+int
+call_do_bt (void)
+{
+  return do_bt () + 1;
+}
+
+void *
+tf (void *arg)
+{
+  if (call_do_bt () != 57)
+    return (void *) 1L;
+  return NULL;
+}
+
+int
+do_test (void)
+{
+  pthread_t th;
+  if (pthread_create (&th, NULL, tf, NULL))
+    {
+      puts ("create failed");
+      return 1;
+    }
+
+  void *res;
+  if (pthread_join (th, &res))
+    {
+      puts ("join failed");
+      return 1;
+    }
+
+  if (res != NULL)
+    {
+      puts ("thread failed");
+      return 1;
+    }
+
+  char **text = backtrace_symbols (bt_array, bt_cnt);
+  if (text == NULL)
+    {
+      puts ("backtrace_symbols failed");
+      return 1;
+    }
+
+  for (int i = 0; i < bt_cnt; ++i)
+    puts (text[i]);
+
+  return 0;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"

sysdeps/unix/sysv/linux/x86_64/clone.S

@@ -1,4 +1,4 @@
-/* Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
+/* Copyright (C) 2001, 2002, 2003, 2004 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
@@ -72,6 +72,10 @@ ENTRY (BP_SYM (__clone))
 	movq	%r9, %r8
 	movq	8(%rsp), %r10
 	movq	$SYS_ify(clone),%rax
+
+	/* End FDE now, because in the child the unwind info will be
+	   wrong.  */
+	cfi_endproc;
 	syscall
 
 	testq	%rax,%rax
@@ -82,6 +86,10 @@ L(pseudo_end):
 	ret
 
 thread_start:
+	/* Clear the frame pointer.  The ABI suggests this be done, to mark
+	   the outermost frame obviously.  */
+	xorq	%rbp, %rbp
+
 	/* Set up arguments for the function call.  */
 	popq	%rax		/* Function to call.  */
 	popq	%rdi		/* Argument.  */
@@ -90,6 +98,7 @@ thread_start:
 	movq	%rax, %rdi
 	call	HIDDEN_JUMPTARGET (_exit)
 
+	cfi_startproc;
 PSEUDO_END (BP_SYM (__clone))
 
 weak_alias (BP_SYM (__clone), BP_SYM (clone))