range stepping: tests

This adds tests to verify range stepping is used as expected, by
inspecting the RSP traffic, looking for vCont;s and vCont;r packets.

gdb/testsuite/
2013-05-23  Yao Qi  <yao@codesourcery.com>
	    Pedro Alves  <palves@redhat.com>

	* gdb.base/range-stepping.c: New file.
	* gdb.base/range-stepping.exp: New file.
	* gdb.trace/range-stepping.c: New file.
	* gdb.trace/range-stepping.exp: New file.
	* lib/range-stepping-support.exp: New file.

1 files changed, 56 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.trace/range-stepping.c b/gdb/testsuite/gdb.trace/range-stepping.c
new file mode 100644
index 0000000..b0e93f9
--- /dev/null
+++ b/gdb/testsuite/gdb.trace/range-stepping.c
@@ -0,0 +1,56 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2013 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/>.  */
+
+#ifdef SYMBOL_PREFIX
+#define SYMBOL(str)     SYMBOL_PREFIX #str
+#else
+#define SYMBOL(str)     #str
+#endif
+
+/* `set_point' further below is the label where we'll set tracepoints
+   at.  The insn at the label must the large enough to fit a fast
+   tracepoint jump.  */
+#if (defined __x86_64__ || defined __i386__)
+#  define NOP "   .byte 0xe9,0x00,0x00,0x00,0x00\n" /* jmp $+5 (5-byte nop) */
+#else
+#  define NOP "" /* port me */
+#endif
+
+int
+main(void)
+{
+  /* Note: 'volatile' is used to make sure the compiler doesn't
+     optimize out these variables.  We want to be sure instructions
+     are generated for accesses.  */
+  volatile int i = 0;
+
+  /* Generate a single line with a label in the middle where we can
+     place either a trap tracepoint or a fast tracepoint.  */
+#define LINE_WITH_FAST_TRACEPOINT					\
+  do {									\
+    i = 1;								\
+    asm ("    .global " SYMBOL (set_point) "\n"			\
+	 SYMBOL (set_point) ":\n"					\
+	 NOP								\
+    );									\
+    i = 2;								\
+ } while (0)
+
+  LINE_WITH_FAST_TRACEPOINT; /* location 1 */
+
+  return 0;
+}