import Unicorn2

qemu/util/guest-random.c

@@ -0,0 +1,81 @@
+/*
+ * QEMU guest-visible random functions
+ *
+ * Copyright 2019 Linaro, Ltd.
+ *
+ * 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 2 of the License, or (at your option)
+ * any later version.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/cutils.h"
+//#include "qapi/error.h"
+#include "qemu/guest-random.h"
+#include "crypto/random.h"
+//#include "sysemu/replay.h"
+
+
+#ifndef _MSC_VER
+static __thread GRand *thread_rand;
+#endif
+static bool deterministic = true;
+
+
+static int glib_random_bytes(void *buf, size_t len)
+{
+#ifndef _MSC_VER
+    GRand *rand = thread_rand;
+    size_t i;
+    uint32_t x;
+
+    if (unlikely(rand == NULL)) {
+        /* Thread not initialized for a cpu, or main w/o -seed.  */
+        thread_rand = rand = g_rand_new();
+    }
+
+    for (i = 0; i + 4 <= len; i += 4) {
+        x = g_rand_int(rand);
+        __builtin_memcpy(buf + i, &x, 4);
+    }
+    if (i < len) {
+        x = g_rand_int(rand);
+        __builtin_memcpy(buf + i, &x, i - len);
+    }
+#endif
+    return 0;
+}
+
+int qemu_guest_getrandom(void *buf, size_t len)
+{
+    return glib_random_bytes(buf, len);
+}
+
+void qemu_guest_getrandom_nofail(void *buf, size_t len)
+{
+    (void)qemu_guest_getrandom(buf, len);
+}
+
+uint64_t qemu_guest_random_seed_thread_part1(void)
+{
+    if (deterministic) {
+        uint64_t ret;
+        glib_random_bytes(&ret, sizeof(ret));
+        return ret;
+    }
+    return 0;
+}
+
+void qemu_guest_random_seed_thread_part2(uint64_t seed)
+{
+#ifndef _MSC_VER
+    g_assert(thread_rand == NULL);
+    if (deterministic) {
+        thread_rand =
+            g_rand_new_with_seed_array((const guint32 *)&seed,
+                                       sizeof(seed) / sizeof(guint32));
+    }
+#endif
+}
+