xref: /openbmc/qemu/tests/tcg/plugins/empty.c (revision 1b4c136b)
1 /*
2  * Copyright (C) 2018, Emilio G. Cota <cota@braap.org>
3  *
4  * License: GNU GPL, version 2 or later.
5  *   See the COPYING file in the top-level directory.
6  */
7 #include <inttypes.h>
8 #include <assert.h>
9 #include <stdlib.h>
10 #include <string.h>
11 #include <unistd.h>
12 #include <stdio.h>
13 
14 #include <qemu-plugin.h>
15 
16 QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
17 
18 /*
19  * Empty TB translation callback.
20  * This allows us to measure the overhead of injecting and then
21  * removing empty instrumentation.
22  */
vcpu_tb_trans(qemu_plugin_id_t id,struct qemu_plugin_tb * tb)23 static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
24 { }
25 
qemu_plugin_install(qemu_plugin_id_t id,const qemu_info_t * info,int argc,char ** argv)26 QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
27                                            const qemu_info_t *info,
28                                            int argc, char **argv)
29 {
30     qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
31     return 0;
32 }
33