2007-12-18  Luis Machado  <luisgpm@br.ibm.com>

    * gdb.arch/ppc64-atomic-inst.c: New testcase source file.
    * gdb.arch/ppc64-atomic-inst.exp: New testcase expect file.

Index: gdb/testsuite/gdb.arch/ppc64-atomic-inst.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ gdb/testsuite/gdb.arch/ppc64-atomic-inst.c	2007-12-18 10:17:34.000000000 -0800
@@ -0,0 +1,44 @@
+/* This file is part of GDB, the GNU debugger.
+
+   Copyright 2007 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/>.  */
+
+#include <stdio.h>
+
+int main()
+{
+  unsigned int word = 0;
+  unsigned int *word_addr = &word;
+  unsigned long dword = 0;
+  unsigned long *dword_addr = &dword;
+
+  __asm __volatile ("1:     lwarx   %0,0,%2\n"              \
+                    "       addi    %0,%0,1\n"              \
+                    "       stwcx.  %0,0,%2\n"              \
+                    "       bne-    1b"			    \
+                    : "=&b" (word), "=m" (*word_addr)       \
+                    : "b" (word_addr), "m" (*word_addr)     \
+                    : "cr0", "memory");			    \
+
+  __asm __volatile ("1:     ldarx   %0,0,%2\n"              \
+                    "       addi    %0,%0,1\n"              \
+                    "       stdcx.  %0,0,%2\n"              \
+                    "       bne-    1b"                     \
+                    : "=&b" (dword), "=m" (*dword_addr)     \
+                    : "b" (dword_addr), "m" (*dword_addr)   \
+                    : "cr0", "memory");                     \
+
+  return 0;
+}
Index: gdb/testsuite/gdb.arch/ppc64-atomic-inst.exp
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ gdb/testsuite/gdb.arch/ppc64-atomic-inst.exp	2007-12-18 10:18:36.000000000 -0800
@@ -0,0 +1,66 @@
+# Copyright 2007 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, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+#
+# This file is part of the gdb testsuite.
+
+if $tracelevel {
+    strace $tracelevel
+}
+
+# Test single stepping through atomic sequences beginning with
+# a lwarx/ldarx instruction and ending with a stwcx/stdcx
+# instruction.
+
+set prms_id 0
+set bug_id 0
+
+if ![istarget "powerpc64-*"] then {
+    verbose "Skipping testing of powerpc64 single stepping over atomic sequences."
+    return
+}
+
+set testfile "ppc64-atomic-inst"
+set srcfile ${testfile}.c
+set binfile ${objdir}/${subdir}/${testfile}
+set compile_flags "debug"
+
+if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable [concat debug additional_flags=-m64]] != "" } {
+    unsupported "Testcase compile failed."
+    return -1
+}
+
+gdb_exit
+gdb_start
+gdb_reinitialize_dir $srcdir/$subdir
+gdb_load ${binfile}
+
+if ![runto_main] then {
+    perror "Couldn't run to breakpoint"
+    continue
+}
+
+set bp1 [gdb_get_line_number "lwarx"]
+gdb_breakpoint "$bp1" "Breakpoint $decimal at $hex" \
+  "Set the breakpoint at the start of the sequence"
+
+gdb_test continue "Continuing.*Breakpoint $decimal.*" \
+  "Continue until breakpoint"
+
+gdb_test next ".*__asm __volatile.*" \
+  "Step through the lwarx/stwcx sequence"
+
+gdb_test next ".*return 0.*" \
+  "Step through the ldarx/stdcx sequence"