tests/plugin/insn.c

   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 #include <glib.h>
  14
  15 #include <qemu-plugin.h>
  16
  17 QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
  18
  19 static uint64_t insn_count;
  20 static bool do_inline;
  21
  22 static void vcpu_insn_exec_before(unsigned int cpu_index, void *udata)
  23 {
  24     static uint64_t last_pc;
  25     uint64_t this_pc = GPOINTER_TO_UINT(udata);
  26     if (this_pc == last_pc) {
  27         g_autofree gchar *out = g_strdup_printf("detected repeat execution @ 0x%"
  28                                                 PRIx64 "\n", this_pc);
  29         qemu_plugin_outs(out);
  30     }
  31     last_pc = this_pc;
  32     insn_count++;
  33 }
  34
  35 static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
  36 {
  37     size_t n = qemu_plugin_tb_n_insns(tb);
  38     size_t i;
  39
  40     for (i = 0; i < n; i++) {
  41         struct qemu_plugin_insn *insn = qemu_plugin_tb_get_insn(tb, i);
  42
  43         if (do_inline) {
  44             qemu_plugin_register_vcpu_insn_exec_inline(
  45                 insn, QEMU_PLUGIN_INLINE_ADD_U64, &insn_count, 1);
  46         } else {
  47             uint64_t vaddr = qemu_plugin_insn_vaddr(insn);
  48             qemu_plugin_register_vcpu_insn_exec_cb(
  49                 insn, vcpu_insn_exec_before, QEMU_PLUGIN_CB_NO_REGS,
  50                 GUINT_TO_POINTER(vaddr));
  51         }
  52     }
  53 }
  54
  55 static void plugin_exit(qemu_plugin_id_t id, void *p)
  56 {
  57     g_autofree gchar *out = g_strdup_printf("insns: %" PRIu64 "\n", insn_count);
  58     qemu_plugin_outs(out);
  59 }
  60
  61 QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
  62                                            const qemu_info_t *info,
  63                                            int argc, char **argv)
  64 {
  65     if (argc && !strcmp(argv[0], "inline")) {
  66         do_inline = true;
  67     }
  68
  69     qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
  70     qemu_plugin_register_atexit_cb(id, plugin_exit, NULL);
  71     return 0;
  72 }