common header for qemu and unicorn

qemu_mode/patches/afl-qemu-common.h

@@ -0,0 +1,52 @@
+/*
+   american fuzzy lop - high-performance binary-only instrumentation
+   -----------------------------------------------------------------
+
+   Written by Andrew Griffiths <agriffiths@google.com> and
+              Michal Zalewski <lcamtuf@google.com>
+
+   Idea & design very much by Andrew Griffiths.
+
+   TCG instrumentation and block chaining support by Andrea Biondo
+                                      <andrea.biondo965@gmail.com>
+
+   QEMU 3.1.0 port, TCG thread-safety and CompareCoverage by Andrea Fioraldi
+                                      <andreafioraldi@gmail.com>
+
+   Copyright 2015, 2016, 2017 Google Inc. All rights reserved.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at:
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+   This code is a shim patched into the separately-distributed source
+   code of QEMU 3.1.0. It leverages the built-in QEMU tracing functionality
+   to implement AFL-style instrumentation and to take care of the remaining
+   parts of the AFL fork server logic.
+
+   The resulting QEMU binary is essentially a standalone instrumentation
+   tool; for an example of how to leverage it for other purposes, you can
+   have a look at afl-showmap.c.
+
+ */
+
+#include "../../config.h"
+
+/* NeverZero */ 
+
+#if (defined(__x86_64__) || defined(__i386__)) && defined(AFL_QEMU_NOT_ZERO)
+#  define INC_AFL_AREA(loc) \
+    asm volatile ( \
+      "incb (%0, %1, 1)\n" \
+      "adcb $0, (%0, %1, 1)\n" \
+      : /* no out */ \
+      : "r" (afl_area_ptr), "r" (loc) \
+      : "memory", "eax" \
+    )
+#else
+#  define INC_AFL_AREA(loc) \
+  afl_area_ptr[loc]++
+#endif
+