PowerPC: fix backtrace to handle signal trampolines

This patch fixes backtrace for PPC32 and PPC64 to correctly handle
signal trampolines. The 'debug/tst-backtrace6.c' also check for
SA_SIGINFO handling, where is triggers another vDSO symbols for PPC32.

3 files changed, 32 insertions, 4 deletions

diff --git a/debug/Makefile b/debug/Makefile
index 779741f9ef..13ee5c80b8 100644
--- a/debug/Makefile
+++ b/debug/Makefile
@@ -130,16 +130,18 @@ CFLAGS-tst-backtrace2.c += -funwind-tables
 CFLAGS-tst-backtrace3.c += -funwind-tables
 CFLAGS-tst-backtrace4.c += -funwind-tables
 CFLAGS-tst-backtrace5.c += -funwind-tables
+CFLAGS-tst-backtrace6.c += -funwind-tables
 LDFLAGS-tst-backtrace2 = -rdynamic
 LDFLAGS-tst-backtrace3 = -rdynamic
 LDFLAGS-tst-backtrace4 = -rdynamic
 LDFLAGS-tst-backtrace5 = -rdynamic
+LDFLAGS-tst-backtrace6 = -rdynamic
 
 tests = backtrace-tst tst-longjmp_chk tst-chk1 tst-chk2 tst-chk3 \
 	tst-lfschk1 tst-lfschk2 tst-lfschk3 test-strcpy_chk test-stpcpy_chk \
 	tst-chk4 tst-chk5 tst-chk6 tst-lfschk4 tst-lfschk5 tst-lfschk6 \
 	tst-longjmp_chk2 tst-backtrace2 tst-backtrace3 tst-backtrace4 \
-	tst-backtrace5
+	tst-backtrace5 tst-backtrace6
 
 tests-ifunc := $(stpcpy_chk strcpy_chk:%=test-%-ifunc)
 tests += $(tests-ifunc)
diff --git a/debug/tst-backtrace5.c b/debug/tst-backtrace5.c
index ca47437d92..51180c1c8c 100644
--- a/debug/tst-backtrace5.c
+++ b/debug/tst-backtrace5.c
@@ -28,6 +28,10 @@
 
 #include "tst-backtrace.h"
 
+#ifndef SIGACTION_FLAGS
+# define SIGACTION_FLAGS 0
+#endif
+
 static int do_test (void);
 #define TEST_FUNCTION do_test ()
 #include "../test-skeleton.c"
@@ -91,7 +95,7 @@ handle_signal (int signum)
 }
 
 NO_INLINE int
-fn (int c)
+fn (int c, int flags)
 {
   pid_t parent_pid, child_pid;
   int pipefd[2];
@@ -100,12 +104,13 @@ fn (int c)
 
   if (c > 0)
     {
-      fn (c - 1);
+      fn (c - 1, flags);
       return x;
     }
 
   memset (&act, 0, sizeof (act));
   act.sa_handler = handle_signal;
+  act.sa_flags = flags;
   sigemptyset (&act.sa_mask);
   sigaction (SIGUSR1, &act, NULL);
   parent_pid = getpid ();
@@ -131,6 +136,6 @@ fn (int c)
 NO_INLINE static int
 do_test (void)
 {
-  fn (2);
+  fn (2, SIGACTION_FLAGS);
   return ret;
 }
diff --git a/debug/tst-backtrace6.c b/debug/tst-backtrace6.c
new file mode 100644
index 0000000000..cd8dbcd1db
--- /dev/null
+++ b/debug/tst-backtrace6.c
@@ -0,0 +1,21 @@
+/* Test backtrace and backtrace_symbols for signal frames, where a
+   system call was interrupted by a signal.
+   Copyright (C) 2013 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
+   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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#define SIGACTION_FLAGS SA_SIGINFO
+#include <debug/tst-backtrace5.c>