gdb/

	Fix crash during stepping on ppc32.
	* ppc-linux-tdep.c (powerpc_linux_in_dynsym_resolve_code): Test NULL
	SYM.

gdb/testsuite/
	Fix crash during stepping on ppc32.
	* gdb.base/step-symless.c: New file.
	* gdb.base/step-symless.exp: New file.

5 files changed, 94 insertions, 2 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 53f2078..8fe5e27 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,9 @@
+2012-10-06  Jan Kratochvil  <jan.kratochvil@redhat.com>
+
+	Fix crash during stepping on ppc32.
+	* ppc-linux-tdep.c (powerpc_linux_in_dynsym_resolve_code): Test NULL
+	SYM.
+
 2012-10-03  Doug Evans  <dje@google.com>
 
 	PR symtab/14601
diff --git a/gdb/ppc-linux-tdep.c b/gdb/ppc-linux-tdep.c
index c7b70db..ccded83 100644
--- a/gdb/ppc-linux-tdep.c
+++ b/gdb/ppc-linux-tdep.c
@@ -648,8 +648,9 @@ powerpc_linux_in_dynsym_resolve_code (CORE_ADDR pc)
 
   /* Check if we are in the resolver.  */
   sym = lookup_minimal_symbol_by_pc (pc);
-  if ((strcmp (SYMBOL_LINKAGE_NAME (sym), "__glink") == 0)
-      || (strcmp (SYMBOL_LINKAGE_NAME (sym), "__glink_PLTresolve") == 0))
+  if (sym != NULL
+      && (strcmp (SYMBOL_LINKAGE_NAME (sym), "__glink") == 0
+	  || strcmp (SYMBOL_LINKAGE_NAME (sym), "__glink_PLTresolve") == 0))
     return 1;
 
   return 0;
diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index f0f8203..4eb19bd 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,9 @@
+2012-10-06  Jan Kratochvil  <jan.kratochvil@redhat.com>
+
+	Fix crash during stepping on ppc32.
+	* gdb.base/step-symless.c: New file.
+	* gdb.base/step-symless.exp: New file.
+
 2012-10-03  Doug Evans  <dje@google.com>
 
 	PR symtab/14601
diff --git a/gdb/testsuite/gdb.base/step-symless.c b/gdb/testsuite/gdb.base/step-symless.c
new file mode 100644
index 0000000..97eaf5e
--- /dev/null
+++ b/gdb/testsuite/gdb.base/step-symless.c
@@ -0,0 +1,38 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2012 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+static volatile int v;
+
+static void
+symful (void)
+{
+  v++;
+}
+
+static void
+symless (void)
+{
+  v++;
+}
+
+int
+main (void)
+{
+  symless ();
+  symful ();
+  return 0;
+}
diff --git a/gdb/testsuite/gdb.base/step-symless.exp b/gdb/testsuite/gdb.base/step-symless.exp
new file mode 100644
index 0000000..47d36ab
--- /dev/null
+++ b/gdb/testsuite/gdb.base/step-symless.exp
@@ -0,0 +1,41 @@
+# Copyright (C) 2012 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+standard_testfile
+if {[build_executable ${testfile}.exp ${testfile} ${srcfile} {nodebug}] == -1} {
+    return -1
+}
+
+# We need those symbols global to access them from the .S file.
+set test "strip stub symbols"
+set objcopy_program [transform objcopy]
+set result [catch "exec $objcopy_program -N symless ${binfile}" output]
+verbose "result is $result"
+verbose "output is $output"
+if {$result != 0} {
+    fail $test
+    return
+}
+pass $test
+
+clean_restart $testfile
+
+if ![runto_main] {
+    return -1
+}
+
+gdb_breakpoint symful
+
+gdb_test "step" "Single stepping until exit.*no line number information.*\r\nBreakpoint \[^\r\n\]* in \\.?symful \\(\\)"