1 files changed, 115 insertions, 0 deletions
diff --git a/tests/plugin/insn.c b/tests/plugin/insn.c
new file mode 100644
index 000000000..d229fdc00
--- /dev/null
+++ b/tests/plugin/insn.c
@@ -0,0 +1,115 @@
+/*
+ * Copyright (C) 2018, Emilio G. Cota <cota@braap.org>
+ *
+ * License: GNU GPL, version 2 or later.
+ *   See the COPYING file in the top-level directory.
+ */
+#include <inttypes.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <glib.h>
+
+#include <qemu-plugin.h>
+
+QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
+
+static uint64_t insn_count;
+static bool do_inline;
+static bool do_size;
+static GArray *sizes;
+
+static void vcpu_insn_exec_before(unsigned int cpu_index, void *udata)
+{
+    static uint64_t last_pc;
+    uint64_t this_pc = GPOINTER_TO_UINT(udata);
+    if (this_pc == last_pc) {
+        g_autofree gchar *out = g_strdup_printf("detected repeat execution @ 0x%"
+                                                PRIx64 "\n", this_pc);
+        qemu_plugin_outs(out);
+    }
+    last_pc = this_pc;
+    insn_count++;
+}
+
+static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
+{
+    size_t n = qemu_plugin_tb_n_insns(tb);
+    size_t i;
+
+    for (i = 0; i < n; i++) {
+        struct qemu_plugin_insn *insn = qemu_plugin_tb_get_insn(tb, i);
+
+        if (do_inline) {
+            qemu_plugin_register_vcpu_insn_exec_inline(
+                insn, QEMU_PLUGIN_INLINE_ADD_U64, &insn_count, 1);
+        } else {
+            uint64_t vaddr = qemu_plugin_insn_vaddr(insn);
+            qemu_plugin_register_vcpu_insn_exec_cb(
+                insn, vcpu_insn_exec_before, QEMU_PLUGIN_CB_NO_REGS,
+                GUINT_TO_POINTER(vaddr));
+        }
+
+        if (do_size) {
+            size_t sz = qemu_plugin_insn_size(insn);
+            if (sz > sizes->len) {
+                g_array_set_size(sizes, sz);
+            }
+            unsigned long *cnt = &g_array_index(sizes, unsigned long, sz);
+            (*cnt)++;
+        }
+    }
+}
+
+static void plugin_exit(qemu_plugin_id_t id, void *p)
+{
+    g_autoptr(GString) out = g_string_new(NULL);
+
+    if (do_size) {
+        int i;
+        for (i = 0; i <= sizes->len; i++) {
+            unsigned long *cnt = &g_array_index(sizes, unsigned long, i);
+            if (*cnt) {
+                g_string_append_printf(out,
+                                       "len %d bytes: %ld insns\n", i, *cnt);
+            }
+        }
+    } else {
+        g_string_append_printf(out, "insns: %" PRIu64 "\n", insn_count);
+    }
+    qemu_plugin_outs(out->str);
+}
+
+QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
+                                           const qemu_info_t *info,
+                                           int argc, char **argv)
+{
+    for (int i = 0; i < argc; i++) {
+        char *opt = argv[i];
+        g_autofree char **tokens = g_strsplit(opt, "=", 2);
+        if (g_strcmp0(tokens[0], "inline") == 0) {
+            if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &do_inline)) {
+                fprintf(stderr, "boolean argument parsing failed: %s\n", opt);
+                return -1;
+            }
+        } else if (g_strcmp0(tokens[0], "sizes") == 0) {
+            if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &do_size)) {
+                fprintf(stderr, "boolean argument parsing failed: %s\n", opt);
+                return -1;
+            }
+        } else {
+            fprintf(stderr, "option parsing failed: %s\n", opt);
+            return -1;
+        }
+    }
+
+    if (do_size) {
+        sizes = g_array_new(true, true, sizeof(unsigned long));
+    }
+
+    qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
+    qemu_plugin_register_atexit_cb(id, plugin_exit, NULL);
+    return 0;
+}