Add a test case for the jit-reader interface

Originally intended to be committed on 2013-01-17 in
675921c059dbaddd02ab2eb8a1eaf77b3ac727dd (Test case for the
jit-reader), but by mistake the files were not added.  Fortunately
they still work.

gdb/testsuite/ChangeLog:
2016-06-17  Sanjoy Das  <sanjoy@playingwithpointers.com>

	* gdb.base/jit-reader.exp: New file.
	* gdb.base/jithost.c: New file.
	* gdb.base/jithost.h: New file.
	* gdb.base/jitreader.c : New file.
	* gdb.base/jit-protocol.h: New file.

1 files changed, 61 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.base/jithost.c b/gdb/testsuite/gdb.base/jithost.c
new file mode 100644
index 0000000..09ab377
--- /dev/null
+++ b/gdb/testsuite/gdb.base/jithost.c
@@ -0,0 +1,61 @@
+/* Copyright (C) 2009-2016 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   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>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <sys/mman.h>
+
+#include JIT_READER_H  /* Please see jit-reader.exp for an explanation.  */
+#include "jithost.h"
+#include "jit-protocol.h"
+
+void __attribute__((noinline)) __jit_debug_register_code () { }
+
+struct jit_descriptor __jit_debug_descriptor = { 1, 0, 0, 0 };
+struct jit_code_entry only_entry;
+
+typedef void (jit_function_t) ();
+
+int main (int argc, char **argv)
+{
+  char *code = mmap (NULL, getpagesize (), PROT_WRITE | PROT_EXEC,
+		     MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+  jit_function_t *function = (jit_function_t *) code;
+
+  code[0] = 0xcc; /* SIGTRAP  */
+  code[1] = 0xc3; /* RET  */
+
+  struct jithost_abi *symfile = malloc (sizeof (struct jithost_abi));
+  symfile->begin = code;
+  symfile->end = code + 2;
+
+  only_entry.symfile_addr = symfile;
+  only_entry.symfile_size = sizeof (struct jithost_abi);
+
+  __jit_debug_descriptor.first_entry = &only_entry;
+  __jit_debug_descriptor.relevant_entry = &only_entry;
+  __jit_debug_descriptor.action_flag = JIT_REGISTER;
+  __jit_debug_descriptor.version = 1;
+  __jit_debug_register_code ();
+
+  function ();
+
+  return 0;
+}