[PATCH] PPC atomic single stepping testcase

[Luis Machado <luisgpm@linux.vnet.ibm.com>]

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Hi Folks,

The fix for the PPC single stepping through atomic sequences is already
upstream, but currently there's no testcase for it. Follows a patch to
add a testcase to check for that problem. It's been sitting in my system
for a while since it needed a fix, but should be OK now.

Comments?

Best regards,
Luis

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2007-12-04  Luis Machado  <luisgpm@br.ibm.com>

    * gdb.arch/powerpc64-atomic-single-stepping.c: New testcase source file.
    * gdb.arch/powerpc64-atomic-single-stepping.exp: New testcase expect file.

Index: gdb/testsuite/gdb.arch/powerpc64-atomic-single-stepping.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ gdb/testsuite/gdb.arch/powerpc64-atomic-single-stepping.c	2007-12-04 10:21:12.000000000 -0800
@@ -0,0 +1,30 @@
+/* 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>
+
+void hello ()
+{
+  printf ("Hello, world!\n");
+}
+
+int main()
+{
+  hello();
+
+  return 0;
+}
Index: gdb/testsuite/gdb.arch/powerpc64-atomic-single-stepping.exp
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ gdb/testsuite/gdb.arch/powerpc64-atomic-single-stepping.exp	2007-12-04 10:22:06.000000000 -0800
@@ -0,0 +1,71 @@
+# Copyright 2006 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 2 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 powerpc64 single stepping over atomic sequences testing."
+    return
+}
+
+set testfile "powerpc64-atomic-single-stepping"
+set srcfile ${testfile}.c
+set binfile ${objdir}/${subdir}/${testfile}
+set compile_flags "debug"
+
+if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable ${compile_flags}] != "" } {
+    unsupported "Testcase compile failed."
+    return -1
+}
+
+gdb_exit
+gdb_start
+gdb_reinitialize_dir $srcdir/$subdir
+gdb_load ${binfile}
+
+if ![runto_main] then {
+    perror "Couldn't run to breakpoint"
+    continue
+}
+
+gdb_test "x/g &puts" "$hex <puts>:\[\t\]+$hex" \
+  "Get the address of the puts function"
+
+gdb_breakpoint "*(\$__ + 88)" "Breakpoint $decimal at $hex" \
+  "Set the breakpoint at the start of the sequence"
+
+gdb_test continue "Continuing.*Breakpoint $decimal.*" \
+  "Continue until breakpoint"
+
+gdb_test "x/i \$pc" "$hex <.*>:\[\t\]+lwarx.*" \
+  "Check for the lwarx instruction to be stepped"
+
+gdb_test "stepi" "$hex in \._IO_puts \\(\\) from .*" \
+  "Step through the atomic sequence"
+
+gdb_test "x/i (\$pc - 4)" "$hex <.*>:\[\t\]+stwcx.*" \
+  "Check for stepped stcwx instruction"