Added AFL-Unicorn mode

27 files changed, 2479 insertions, 0 deletions

diff --git a/unicorn_mode/README.md b/unicorn_mode/README.md
new file mode 100644
index 00000000..5d8b3ce0
--- /dev/null
+++ b/unicorn_mode/README.md
@@ -0,0 +1,16 @@
+```
+        __ _                 _                      
+  __ _ / _| |    _   _ _ __ (_) ___ ___  _ __ _ __  
+ / _` | |_| |___| | | | '_ \| |/ __/ _ \| '__| '_ \ 
+| (_| |  _| |___| |_| | | | | | (_| (_) | |  | | | |
+ \__,_|_| |_|    \__,_|_| |_|_|\___\___/|_|  |_| |_|
+                                                      
+```
+
+afl-unicorn lets you fuzz any piece of binary that can be emulated by [Unicorn Engine](http://www.unicorn-engine.org/). 
+
+For an in-depth description of what this is, how to install it, and how to use it check out this [blog post](https://medium.com/@njvoss299/afl-unicorn-fuzzing-arbitrary-binary-code-563ca28936bf).
+
+For general help with AFL, please refer to both the official [AFL website](http://lcamtuf.coredump.cx/afl/) and the documents in the /doc/ directory.
+
+Created by Nathan Voss, originally funded by [Battelle](https://www.battelle.org/cyber).
\ No newline at end of file
diff --git a/unicorn_mode/build_unicorn_support.sh b/unicorn_mode/build_unicorn_support.sh
new file mode 100644
index 00000000..f9e18fa9
--- /dev/null
+++ b/unicorn_mode/build_unicorn_support.sh
@@ -0,0 +1,186 @@
+#!/bin/sh
+#
+# american fuzzy lop - Unicorn-Mode build script
+# --------------------------------------
+#
+# Written by Nathan Voss <njvoss99@gmail.com>
+# 
+# Adapted from code by Andrew Griffiths <agriffiths@google.com> and
+#                      Michal Zalewski <lcamtuf@google.com>
+#
+# Adapted for Afl++ by Dominik Maier <mail@dmnk.co>
+#
+# Copyright 2017 Battelle Memorial Institute. 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 script downloads, patches, and builds a version of Unicorn with
+# minor tweaks to allow Unicorn-emulated binaries to be run under
+# afl-fuzz. 
+#
+# The modifications reside in patches/*. The standalone Unicorn library
+# will be written to /usr/lib/libunicornafl.so, and the Python bindings
+# will be installed system-wide.
+#
+# You must make sure that Unicorn Engine is not already installed before
+# running this script. If it is, please uninstall it first.
+
+UNICORN_URL="https://github.com/unicorn-engine/unicorn/archive/24f55a7973278f20f0de21b904851d99d4716263.tar.gz"
+UNICORN_SHA384="7180d47ca52c99b4c073a343a2ead91da1a829fdc3809f3ceada5d872e162962eab98873a8bc7971449d5f34f41fdb93"
+
+echo "================================================="
+echo "Unicorn-AFL build script"
+echo "================================================="
+echo
+
+echo "[*] Performing basic sanity checks..."
+
+if [ ! "`uname -s`" = "Linux" ]; then
+
+  echo "[-] Error: Unicorn instrumentation is supported only on Linux."
+  exit 1
+  
+fi
+
+if [ ! -f "patches/afl-unicorn-cpu-inl.h" -o ! -f "../config.h" ]; then
+
+  echo "[-] Error: key files not found - wrong working directory?"
+  exit 1
+
+fi
+
+if [ ! -f "../afl-showmap" ]; then
+
+  echo "[-] Error: ../afl-showmap not found - compile AFL first!"
+  exit 1
+
+fi
+
+for i in wget python automake autoconf sha384sum; do
+
+  T=`which "$i" 2>/dev/null`
+
+  if [ "$T" = "" ]; then
+
+    echo "[-] Error: '$i' not found. Run 'sudo apt-get install $i'."
+    exit 1
+
+  fi
+
+done
+
+if ! which easy_install > /dev/null; then
+
+  echo "[-] Error: Python setup-tools not found. Run 'sudo apt-get install python-setuptools'."
+  exit 1
+
+fi
+
+if echo "$CC" | grep -qF /afl-; then
+
+  echo "[-] Error: do not use afl-gcc or afl-clang to compile this tool."
+  exit 1
+
+fi
+
+echo "[+] All checks passed!"
+
+ARCHIVE="`basename -- "$UNICORN_URL"`"
+
+CKSUM=`sha384sum -- "$ARCHIVE" 2>/dev/null | cut -d' ' -f1`
+
+if [ ! "$CKSUM" = "$UNICORN_SHA384" ]; then
+
+  echo "[*] Downloading Unicorn v1.0.1 from the web..."
+  rm -f "$ARCHIVE"
+  wget -O "$ARCHIVE" -- "$UNICORN_URL" || exit 1
+
+  CKSUM=`sha384sum -- "$ARCHIVE" 2>/dev/null | cut -d' ' -f1`
+
+fi
+
+if [ "$CKSUM" = "$UNICORN_SHA384" ]; then
+
+  echo "[+] Cryptographic signature on $ARCHIVE checks out."
+
+else
+
+  echo "[-] Error: signature mismatch on $ARCHIVE (perhaps download error?)."
+  exit 1
+
+fi
+
+echo "[*] Uncompressing archive (this will take a while)..."
+
+rm -rf "unicorn" || exit 1
+mkdir "unicorn" || exit 1
+tar xzf "$ARCHIVE" -C ./unicorn --strip-components=1 || exit 1
+
+echo "[+] Unpacking successful."
+
+rm -rf "$ARCHIVE" || exit 1
+
+echo "[*] Applying patches..."
+
+cp patches/afl-unicorn-cpu-inl.h unicorn || exit 1
+patch -p1 --directory unicorn <patches/patches.diff || exit 1
+
+echo "[+] Patching done."
+
+echo "[*] Configuring Unicorn build..."
+
+cd "unicorn" || exit 1
+
+echo "[+] Configuration complete."
+
+echo "[*] Attempting to build Unicorn (fingers crossed!)..."
+
+UNICORN_QEMU_FLAGS='--python=python2' make || exit 1
+
+echo "[+] Build process successful!"
+
+echo "[*] Installing Unicorn python bindings..."
+cd bindings/python || exit 1
+if [ -z "$VIRTUAL_ENV" ]; then
+  echo "[*] Info: Installing python unicorn using --user"
+  python setup.py install --user || exit 1
+else
+  echo "[*] Info: Installing python unicorn to virtualenv: $VIRTUAL_ENV"
+  python setup.py install || exit 1
+fi
+export LIBUNICORN_PATH='$(pwd)' # in theory, this allows to switch between afl-unicorn and unicorn so files.
+
+cd ../../ || exit 1
+
+echo "[+] Unicorn bindings installed successfully."
+
+# Compile the sample, run it, verify that it works!
+echo "[*] Testing unicorn-mode functionality by running a sample test harness under afl-unicorn"
+
+cd ../samples/simple || exit 1
+
+# Run afl-showmap on the sample application. If anything comes out then it must have worked!
+unset AFL_INST_RATIO
+echo 0 | ../../../afl-showmap -U -m none -q -o .test-instr0 -- python simple_test_harness.py ./sample_inputs/sample1.bin || exit 1
+
+if [ -s .test-instr0 ]
+then
+  
+  echo "[+] Instrumentation tests passed. "
+  echo "[+] All set, you can now use Unicorn mode (-U) in afl-fuzz!"
+  RETVAL=0
+
+else
+
+  echo "[-] Error: Unicorn mode doesn't seem to work!"
+  RETVAL=1
+
+fi
+
+rm -f .test-instr0
+
+exit $RETVAL
diff --git a/unicorn_mode/helper_scripts/template_test_harness.py b/unicorn_mode/helper_scripts/template_test_harness.py
new file mode 100644
index 00000000..93c526cc
--- /dev/null
+++ b/unicorn_mode/helper_scripts/template_test_harness.py
@@ -0,0 +1,104 @@
+"""
+    template_test_harness.py
+
+    Template which loads the context of a process into a Unicorn Engine,
+    instance, loads a custom (mutated) inputs, and executes the 
+    desired code. Designed to be used in conjunction with one of the
+    Unicorn Context Dumper scripts.
+
+    Author:
+        Nathan Voss <njvoss299@gmail.com>
+"""
+
+import argparse
+
+from unicorn import *
+from unicorn.x86_const import *  # TODO: Set correct architecture here as necessary
+
+import unicorn_loader 
+
+# Simple stand-in heap to prevent OS/kernel issues
+unicorn_heap = None
+
+# Start and end address of emulation
+START_ADDRESS = # TODO: Set start address here
+END_ADDRESS   = # TODO: Set end address here
+
+"""
+    Implement target-specific hooks in here.
+    Stub out, skip past, and re-implement necessary functionality as appropriate
+"""
+def unicorn_hook_instruction(uc, address, size, user_data):
+
+    # TODO: Setup hooks and handle anything you need to here
+    #    - For example, hook malloc/free/etc. and handle it internally
+    pass
+
+#------------------------
+#---- Main test function  
+
+def main():
+
+    parser = argparse.ArgumentParser()
+    parser.add_argument('context_dir', type=str, help="Directory containing process context")
+    parser.add_argument('input_file', type=str, help="Path to the file containing the mutated input content")
+    parser.add_argument('-d', '--debug', default=False, action="store_true", help="Dump trace info")
+    args = parser.parse_args()
+
+    print("Loading context from {}".format(args.context_dir))
+    uc = unicorn_loader.AflUnicornEngine(args.context_dir, enable_trace=args.debug, debug_print=False)       
+
+    # Instantiate the hook function to avoid emulation errors
+    global unicorn_heap
+    unicorn_heap = unicorn_loader.UnicornSimpleHeap(uc, debug_print=True)
+    uc.hook_add(UC_HOOK_CODE, unicorn_hook_instruction)
+
+    # Execute 1 instruction just to startup the forkserver
+    # NOTE: This instruction will be executed again later, so be sure that
+    #       there are no negative consequences to the overall execution state.
+    #       If there are, change the later call to emu_start to no re-execute 
+    #       the first instruction.
+    print("Starting the forkserver by executing 1 instruction")
+    try:
+        uc.emu_start(START_ADDRESS, 0, 0, count=1)
+    except UcError as e:
+        print("ERROR: Failed to execute a single instruction (error: {})!".format(e))
+        return
+
+    # Allocate a buffer and load a mutated input and put it into the right spot
+    if args.input_file:
+        print("Loading input content from {}".format(args.input_file))
+        input_file = open(args.input_file, 'rb')
+        input_content = input_file.read()
+        input_file.close()
+
+        # TODO: Apply constraints to mutated input here
+        raise exceptions.NotImplementedError('No constraints on the mutated inputs have been set!')
+        
+        # Allocate a new buffer and put the input into it
+        buf_addr = unicorn_heap.malloc(len(input_content))
+        uc.mem_write(buf_addr, input_content)
+        print("Allocated mutated input buffer @ 0x{0:016x}".format(buf_addr))
+
+        # TODO: Set the input into the state so it will be handled
+        raise exceptions.NotImplementedError('The mutated input was not loaded into the Unicorn state!')
+        
+    # Run the test
+    print("Executing from 0x{0:016x} to 0x{1:016x}".format(START_ADDRESS, END_ADDRESS))
+    try:
+        result = uc.emu_start(START_ADDRESS, END_ADDRESS, timeout=0, count=0)
+    except UcError as e:
+        # If something went wrong during emulation a signal is raised to force this 
+        # script to crash in a way that AFL can detect ('uc.force_crash()' should be
+        # called for any condition that you want AFL to treat as a crash).
+        print("Execution failed with error: {}".format(e))
+        uc.dump_regs() 
+        uc.force_crash(e)
+
+    print("Final register state:")    
+    uc.dump_regs()
+
+    print("Done.")    
+        
+if __name__ == "__main__":
+    main()
diff --git a/unicorn_mode/helper_scripts/unicorn_dumper_gdb.py b/unicorn_mode/helper_scripts/unicorn_dumper_gdb.py
new file mode 100644
index 00000000..22b9fd47
--- /dev/null
+++ b/unicorn_mode/helper_scripts/unicorn_dumper_gdb.py
@@ -0,0 +1,190 @@
+"""
+    unicorn_dumper_gdb.py
+    
+    When run with GDB sitting at a debug breakpoint, this
+    dumps the current state (registers/memory/etc) of
+    the process to a directory consisting of an index 
+    file with register and segment information and 
+    sub-files containing all actual process memory.
+    
+    The output of this script is expected to be used 
+    to initialize context for Unicorn emulation.
+
+    -----------
+
+    In order to run this script, GEF needs to be running in the GDB session (gef.py)
+    # HELPERS from: https://github.com/hugsy/gef/blob/master/gef.py
+    It can be loaded with:
+      source <path_to_gef>/gef.py
+
+    Call this function when at a breakpoint in your process with:
+      source unicorn_dumper_gdb.py
+
+    -----------
+
+
+"""
+
+import datetime
+import hashlib
+import json
+import os
+import sys
+import time
+import zlib
+
+# GDB Python SDK
+import gdb
+
+# Maximum segment size that we'll store
+# Yep, this could break stuff pretty quickly if we
+# omit something that's used during emulation.
+MAX_SEG_SIZE = 128 * 1024 * 1024
+
+# Name of the index file
+INDEX_FILE_NAME = "_index.json"
+
+#----------------------
+#---- Helper Functions
+
+def map_arch():
+    arch = get_arch() # from GEF
+    if 'x86_64' in arch or 'x86-64' in arch:
+        return "x64"
+    elif 'x86' in arch or 'i386' in arch:
+        return "x86"
+    elif 'aarch64' in arch or 'arm64' in arch:
+        return "arm64le"
+    elif 'aarch64_be' in arch:
+        return "arm64be"
+    elif 'armeb' in arch:
+        # check for THUMB mode
+        cpsr = get_register('cpsr')
+        if (cpsr & (1 << 5)):
+            return "armbethumb"
+        else:
+            return "armbe"
+    elif 'arm' in arch:
+        # check for THUMB mode
+        cpsr = get_register('cpsr')
+        if (cpsr & (1 << 5)):
+            return "armlethumb"
+        else:
+            return "armle"
+    else:
+        return ""
+
+
+#-----------------------
+#---- Dumping functions
+
+def dump_arch_info():
+    arch_info = {}
+    arch_info["arch"] = map_arch()
+    return arch_info
+
+
+def dump_regs():
+    reg_state = {}
+    for reg in current_arch.all_registers:
+        reg_val = get_register(reg)
+        # current dumper script looks for register values to be hex strings
+#         reg_str = "0x{:08x}".format(reg_val)
+#         if "64" in get_arch():
+#             reg_str = "0x{:016x}".format(reg_val)
+#         reg_state[reg.strip().strip('$')] = reg_str
+        reg_state[reg.strip().strip('$')] = reg_val
+    return reg_state
+
+
+def dump_process_memory(output_dir):
+    # Segment information dictionary
+    final_segment_list = []
+    
+    # GEF:
+    vmmap = get_process_maps()
+    if not vmmap:
+        print("No address mapping information found")
+        return final_segment_list
+
+    for entry in vmmap:
+        if entry.page_start == entry.page_end:
+            continue
+        
+        seg_info = {'start': entry.page_start, 'end': entry.page_end, 'name': entry.path, 'permissions': {
+            "r": entry.is_readable() > 0,
+            "w": entry.is_writable() > 0,
+            "x": entry.is_executable() > 0
+        }, 'content_file': ''}
+
+        # "(deleted)" may or may not be valid, but don't push it.
+        if entry.is_readable() and not '(deleted)' in entry.path:
+            try:
+                # Compress and dump the content to a file
+                seg_content = read_memory(entry.page_start, entry.size)
+                if(seg_content == None):
+                    print("Segment empty: @0x{0:016x} (size:UNKNOWN) {1}".format(entry.page_start, entry.path))
+                else:
+                    print("Dumping segment @0x{0:016x} (size:0x{1:x}): {2} [{3}]".format(entry.page_start, len(seg_content), entry.path, repr(seg_info['permissions'])))
+                    compressed_seg_content = zlib.compress(seg_content)
+                    md5_sum = hashlib.md5(compressed_seg_content).hexdigest() + ".bin"
+                    seg_info["content_file"] = md5_sum
+                    
+                    # Write the compressed contents to disk
+                    out_file = open(os.path.join(output_dir, md5_sum), 'wb')
+                    out_file.write(compressed_seg_content)
+                    out_file.close()
+
+            except:
+                print("Exception reading segment ({}): {}".format(entry.path, sys.exc_info()[0]))
+        else:
+            print("Skipping segment {0}@0x{1:016x}".format(entry.path, entry.page_start))
+
+        # Add the segment to the list
+        final_segment_list.append(seg_info)
+
+            
+    return final_segment_list
+
+#----------
+#---- Main    
+    
+def main():
+    print("----- Unicorn Context Dumper -----")
+    print("You must be actively debugging before running this!")
+    print("If it fails, double check that you are actively debugging before running.")
+    try:
+        GEF_TEST = set_arch()
+    except Exception as e:
+        print("!!! GEF not running in GDB.  Please run gef.py by executing:")
+        print('\tpython execfile ("<path_to_gef>/gef.py")')
+        return
+    
+    try:
+    
+        # Create the output directory
+        timestamp = datetime.datetime.fromtimestamp(time.time()).strftime('%Y%m%d_%H%M%S')
+        output_path = "UnicornContext_" + timestamp
+        if not os.path.exists(output_path):
+            os.makedirs(output_path)
+        print("Process context will be output to {}".format(output_path))
+            
+        # Get the context
+        context = {
+            "arch": dump_arch_info(),
+            "regs": dump_regs(), 
+            "segments": dump_process_memory(output_path),
+        }
+
+        # Write the index file
+        index_file = open(os.path.join(output_path, INDEX_FILE_NAME), 'w')
+        index_file.write(json.dumps(context, indent=4))
+        index_file.close()    
+        print("Done.")
+        
+    except Exception as e:
+        print("!!! ERROR:\n\t{}".format(repr(e)))
+        
+if __name__ == "__main__":
+    main()
+    
diff --git a/unicorn_mode/helper_scripts/unicorn_dumper_ida.py b/unicorn_mode/helper_scripts/unicorn_dumper_ida.py
new file mode 100644
index 00000000..3f955a5c
--- /dev/null
+++ b/unicorn_mode/helper_scripts/unicorn_dumper_ida.py
@@ -0,0 +1,209 @@
+"""
+    unicorn_dumper_ida.py
+    
+    When run with IDA (<v7) sitting at a debug breakpoint, 
+    dumps the current state (registers/memory/etc) of
+    the process to a directory consisting of an index 
+    file with register and segment information and 
+    sub-files containing all actual process memory.
+    
+    The output of this script is expected to be used 
+    to initialize context for Unicorn emulation.
+"""
+
+import datetime
+import hashlib
+import json
+import os
+import sys
+import time
+import zlib
+
+# IDA Python SDK
+from idaapi import *
+from idc import *
+
+# Maximum segment size that we'll store
+# Yep, this could break stuff pretty quickly if we
+# omit something that's used during emulation.
+MAX_SEG_SIZE = 128 * 1024 * 1024
+
+# Name of the index file
+INDEX_FILE_NAME = "_index.json"
+
+#----------------------
+#---- Helper Functions
+
+def get_arch():
+    if ph.id == PLFM_386 and ph.flag & PR_USE64:
+        return "x64"
+    elif ph.id == PLFM_386 and ph.flag & PR_USE32:
+        return "x86"
+    elif ph.id == PLFM_ARM and ph.flag & PR_USE64:
+        if cvar.inf.is_be():
+            return "arm64be"
+        else:
+            return "arm64le"
+    elif ph.id == PLFM_ARM and ph.flag & PR_USE32:
+        if cvar.inf.is_be():
+            return "armbe"
+        else:
+            return "armle"
+    else:
+        return ""
+
+def get_register_list(arch):
+    if arch == "arm64le" or arch == "arm64be":
+        arch = "arm64"
+    elif arch == "armle" or arch == "armbe":
+        arch = "arm"
+
+    registers = {
+        "x64" : [
+            "rax", "rbx", "rcx", "rdx", "rsi", "rdi", "rbp", "rsp",
+            "r8",  "r9",  "r10", "r11", "r12", "r13", "r14", "r15",
+            "rip", "rsp", "efl",
+            "cs", "ds", "es", "fs", "gs", "ss",
+        ],
+        "x86" : [
+            "eax", "ebx", "ecx", "edx", "esi", "edi", "ebp", "esp",
+            "eip", "esp", "efl", 
+            "cs", "ds", "es", "fs", "gs", "ss",
+        ],        
+        "arm" : [
+            "R0", "R1", "R2",  "R3",  "R4",  "R5", "R6", "R7",  
+            "R8", "R9", "R10", "R11", "R12", "PC", "SP", "LR",  
+            "PSR",
+        ],
+        "arm64" : [
+            "X0", "X1", "X2", "X3", "X4", "X5", "X6", "X7",  
+            "X8", "X9", "X10", "X11", "X12", "X13", "X14", 
+            "X15", "X16", "X17", "X18", "X19", "X20", "X21", 
+            "X22", "X23", "X24", "X25", "X26", "X27", "X28", 
+            "PC", "SP", "FP", "LR", "CPSR"
+            #    "NZCV",
+        ]
+    }
+    return registers[arch]  
+
+#-----------------------
+#---- Dumping functions
+
+def dump_arch_info():
+    arch_info = {}
+    arch_info["arch"] = get_arch()
+    return arch_info
+
+def dump_regs():
+    reg_state = {}
+    for reg in get_register_list(get_arch()):
+        reg_state[reg] = GetRegValue(reg)
+    return reg_state
+
+def dump_process_memory(output_dir):
+    # Segment information dictionary
+    segment_list = []
+    
+    # Loop over the segments, fill in the info dictionary
+    for seg_ea in Segments():
+        seg_start = SegStart(seg_ea)
+        seg_end = SegEnd(seg_ea)
+        seg_size = seg_end - seg_start
+		
+        seg_info = {}
+        seg_info["name"]  = SegName(seg_ea)
+        seg_info["start"] = seg_start
+        seg_info["end"]   = seg_end
+        
+        perms = getseg(seg_ea).perm
+        seg_info["permissions"] = {
+            "r": False if (perms & SEGPERM_READ)  == 0 else True,
+            "w": False if (perms & SEGPERM_WRITE) == 0 else True,
+            "x": False if (perms & SEGPERM_EXEC)  == 0 else True,
+        }
+
+        if (perms & SEGPERM_READ) and seg_size <= MAX_SEG_SIZE and isLoaded(seg_start):
+            try:
+                # Compress and dump the content to a file
+                seg_content = get_many_bytes(seg_start, seg_end - seg_start)
+                if(seg_content == None):
+                    print("Segment empty: {0}@0x{1:016x} (size:UNKNOWN)".format(SegName(seg_ea), seg_ea))
+                    seg_info["content_file"] = ""
+                else:
+                    print("Dumping segment {0}@0x{1:016x} (size:{2})".format(SegName(seg_ea), seg_ea, len(seg_content)))
+                    compressed_seg_content = zlib.compress(seg_content)
+                    md5_sum = hashlib.md5(compressed_seg_content).hexdigest() + ".bin"
+                    seg_info["content_file"] = md5_sum
+                    
+                    # Write the compressed contents to disk
+                    out_file = open(os.path.join(output_dir, md5_sum), 'wb')
+                    out_file.write(compressed_seg_content)
+                    out_file.close()
+            except:
+                print("Exception reading segment: {}".format(sys.exc_info()[0]))
+                seg_info["content_file"] = ""
+        else:
+            print("Skipping segment {0}@0x{1:016x}".format(SegName(seg_ea), seg_ea))
+            seg_info["content_file"] = ""
+            
+        # Add the segment to the list
+        segment_list.append(seg_info)     
+   
+    return segment_list
+
+"""
+    TODO: FINISH IMPORT DUMPING
+def import_callback(ea, name, ord):
+    if not name:
+    else:
+    
+    # True -> Continue enumeration
+    # False -> End enumeration
+    return True
+    
+def dump_imports():
+    import_dict = {}
+    
+    for i in xrange(0, number_of_import_modules):
+        enum_import_names(i, import_callback)
+    
+    return import_dict
+"""
+ 
+#----------
+#---- Main    
+    
+def main():
+
+    try:
+        print("----- Unicorn Context Dumper -----")
+        print("You must be actively debugging before running this!")
+        print("If it fails, double check that you are actively debugging before running.")
+
+        # Create the output directory
+        timestamp = datetime.datetime.fromtimestamp(time.time()).strftime('%Y%m%d_%H%M%S')
+        output_path = os.path.dirname(os.path.abspath(GetIdbPath()))
+        output_path = os.path.join(output_path, "UnicornContext_" + timestamp)
+        if not os.path.exists(output_path):
+            os.makedirs(output_path)
+        print("Process context will be output to {}".format(output_path))
+            
+        # Get the context
+        context = {
+            "arch": dump_arch_info(),
+            "regs": dump_regs(), 
+            "segments": dump_process_memory(output_path),
+            #"imports": dump_imports(),
+        }
+
+        # Write the index file
+        index_file = open(os.path.join(output_path, INDEX_FILE_NAME), 'w')
+        index_file.write(json.dumps(context, indent=4))
+        index_file.close()    
+        print("Done.")
+        
+    except Exception, e:
+        print("!!! ERROR:\n\t{}".format(str(e)))
+        
+if __name__ == "__main__":
+    main()
\ No newline at end of file
diff --git a/unicorn_mode/helper_scripts/unicorn_dumper_lldb.py b/unicorn_mode/helper_scripts/unicorn_dumper_lldb.py
new file mode 100644
index 00000000..3c019d77
--- /dev/null
+++ b/unicorn_mode/helper_scripts/unicorn_dumper_lldb.py
@@ -0,0 +1,299 @@
+"""
+    unicorn_dumper_lldb.py
+    
+    When run with LLDB sitting at a debug breakpoint, this
+    dumps the current state (registers/memory/etc) of
+    the process to a directory consisting of an index 
+    file with register and segment information and 
+    sub-files containing all actual process memory.
+    
+    The output of this script is expected to be used 
+    to initialize context for Unicorn emulation.
+
+    -----------
+
+    Call this function when at a breakpoint in your process with:
+      command script import -r unicorn_dumper_lldb
+
+    If there is trouble with "split on a NoneType", issue the following command:
+      script lldb.target.triple
+
+    and try to import the script again.
+
+    -----------
+
+"""
+
+from copy import deepcopy
+import datetime
+import hashlib
+import json
+import os
+import sys
+import time
+import zlib
+
+# LLDB Python SDK
+import lldb
+
+# Maximum segment size that we'll store
+# Yep, this could break stuff pretty quickly if we
+# omit something that's used during emulation.
+MAX_SEG_SIZE = 128 * 1024 * 1024
+
+# Name of the index file
+INDEX_FILE_NAME = "_index.json"
+DEBUG_MEM_FILE_NAME = "_memory.json"
+
+# Page size required by Unicorn
+UNICORN_PAGE_SIZE = 0x1000
+
+# Alignment functions to align all memory segments to Unicorn page boundaries (4KB pages only)
+ALIGN_PAGE_DOWN = lambda x: x & ~(UNICORN_PAGE_SIZE - 1)
+ALIGN_PAGE_UP   = lambda x: (x + UNICORN_PAGE_SIZE - 1) & ~(UNICORN_PAGE_SIZE-1)
+
+#----------------------
+#---- Helper Functions
+
+def overlap_alignments(segments, memory):
+    final_list = []
+    curr_seg_idx = 0
+    curr_end_addr = 0
+    curr_node = None
+    current_segment = None
+    sorted_segments = sorted(segments, key=lambda k: (k['start'], k['end']))
+    if curr_seg_idx < len(sorted_segments):
+        current_segment = sorted_segments[curr_seg_idx]
+    for mem in sorted(memory, key=lambda k: (k['start'], -k['end'])):
+        if curr_node is None:
+            if current_segment is not None and current_segment['start'] == mem['start']:
+                curr_node = deepcopy(current_segment)
+                curr_node['permissions'] = mem['permissions']
+            else:
+                curr_node = deepcopy(mem)
+
+            curr_end_addr = curr_node['end']
+
+        while curr_end_addr <= mem['end']:
+            if curr_node['end'] == mem['end']:
+                if current_segment is not None and current_segment['start'] > curr_node['start'] and current_segment['start'] < curr_node['end']:
+                    curr_node['end'] = current_segment['start']
+                    if(curr_node['end'] > curr_node['start']):
+                        final_list.append(curr_node)
+                    curr_node = deepcopy(current_segment)
+                    curr_node['permissions'] = mem['permissions']
+                    curr_end_addr = curr_node['end']
+                else:
+                    if(curr_node['end'] > curr_node['start']):
+                        final_list.append(curr_node)
+                    # if curr_node is a segment
+                    if current_segment is not None and current_segment['end'] == mem['end']:
+                        curr_seg_idx += 1
+                        if curr_seg_idx < len(sorted_segments):
+                            current_segment = sorted_segments[curr_seg_idx]
+                        else:
+                            current_segment = None
+
+                    curr_node = None
+                    break
+            # could only be a segment
+            else:
+                if curr_node['end'] < mem['end']:
+                    # check for remaining segments and valid segments
+                    if(curr_node['end'] > curr_node['start']):
+                        final_list.append(curr_node)
+          
+                    curr_seg_idx += 1
+                    if curr_seg_idx < len(sorted_segments):
+                        current_segment = sorted_segments[curr_seg_idx]
+                    else:
+                        current_segment = None
+                        
+                    if current_segment is not None and current_segment['start'] <= curr_end_addr and current_segment['start'] < mem['end']:
+                        curr_node = deepcopy(current_segment)
+                        curr_node['permissions'] = mem['permissions']
+                    else:
+                        # no more segments
+                        curr_node = deepcopy(mem)
+                        
+                    curr_node['start'] = curr_end_addr
+                    curr_end_addr = curr_node['end']
+
+    return final_list    
+
+# https://github.com/llvm-mirror/llvm/blob/master/include/llvm/ADT/Triple.h
+def get_arch():
+    arch, arch_vendor, arch_os = lldb.target.GetTriple().split('-')
+    if arch == 'x86_64':
+        return "x64"
+    elif arch == 'x86' or arch == 'i386':
+        return "x86"
+    elif arch == 'aarch64' or arch == 'arm64':
+        return "arm64le"
+    elif arch == 'aarch64_be':
+        return "arm64be"
+    elif arch == 'armeb':
+        return "armbe"
+    elif arch == 'arm':
+        return "armle"
+    else:
+        return ""
+
+
+#-----------------------
+#---- Dumping functions
+
+def dump_arch_info():
+    arch_info = {}
+    arch_info["arch"] = get_arch()
+    return arch_info
+
+
+def dump_regs():
+    reg_state = {}
+    for reg_list in lldb.frame.GetRegisters():
+        if 'general purpose registers' in reg_list.GetName().lower():
+            for reg in reg_list:
+                reg_state[reg.GetName()] = int(reg.GetValue(), 16)
+    return reg_state
+
+def get_section_info(sec):
+    name = sec.name if sec.name is not None else ''
+    if sec.GetParent().name is not None:
+        name = sec.GetParent().name + '.' + sec.name
+
+    module_name = sec.addr.module.file.GetFilename()
+    module_name = module_name if module_name is not None else ''
+    long_name = module_name + '.' + name
+    
+    return sec.addr.load_addr, (sec.addr.load_addr + sec.size), sec.size, long_name
+ 
+
+def dump_process_memory(output_dir):
+    # Segment information dictionary
+    raw_segment_list = []
+    raw_memory_list = []
+    
+    # 1st pass:
+    # Loop over the segments, fill in the segment info dictionary
+    for module in lldb.target.module_iter():
+        for seg_ea in module.section_iter():
+            seg_info = {'module': module.file.GetFilename() }
+            seg_info['start'], seg_info['end'], seg_size, seg_info['name'] = get_section_info(seg_ea)
+            # TODO: Ugly hack for -1 LONG address on 32-bit
+            if seg_info['start'] >= sys.maxint or seg_size <= 0:
+                print "Throwing away page: {}".format(seg_info['name'])     
+                continue
+
+            # Page-align segment
+            seg_info['start'] = ALIGN_PAGE_DOWN(seg_info['start'])
+            seg_info['end'] = ALIGN_PAGE_UP(seg_info['end'])
+            print("Appending: {}".format(seg_info['name']))
+            raw_segment_list.append(seg_info)
+
+    # Add the stack memory region (just hardcode 0x1000 around the current SP)
+    sp = lldb.frame.GetSP()
+    start_sp = ALIGN_PAGE_DOWN(sp)
+    raw_segment_list.append({'start': start_sp, 'end': start_sp + 0x1000, 'name': 'STACK'})
+
+    # Write the original memory to file for debugging
+    index_file = open(os.path.join(output_dir, DEBUG_MEM_FILE_NAME), 'w')
+    index_file.write(json.dumps(raw_segment_list, indent=4))
+    index_file.close()    
+
+    # Loop over raw memory regions 
+    mem_info = lldb.SBMemoryRegionInfo()
+    start_addr = -1
+    next_region_addr = 0
+    while next_region_addr > start_addr:
+        err = lldb.process.GetMemoryRegionInfo(next_region_addr, mem_info)
+        # TODO: Should check err.success.  If False, what do we do?
+        if not err.success:
+            break
+        next_region_addr = mem_info.GetRegionEnd()
+        if next_region_addr >= sys.maxsize:
+            break
+
+        start_addr = mem_info.GetRegionBase()
+        end_addr = mem_info.GetRegionEnd()
+
+        # Unknown region name
+        region_name = 'UNKNOWN'
+
+        # Ignore regions that aren't even mapped
+        if mem_info.IsMapped() and mem_info.IsReadable():
+            mem_info_obj = {'start': start_addr, 'end': end_addr, 'name': region_name, 'permissions': {
+                "r": mem_info.IsReadable(),
+                "w": mem_info.IsWritable(),
+                "x": mem_info.IsExecutable()
+            }}
+
+            raw_memory_list.append(mem_info_obj)
+
+    final_segment_list = overlap_alignments(raw_segment_list, raw_memory_list)
+
+    for seg_info in final_segment_list:
+        try:
+            seg_info['content_file'] = ''
+            start_addr = seg_info['start']
+            end_addr = seg_info['end']
+            region_name = seg_info['name']
+            # Compress and dump the content to a file
+            err = lldb.SBError()
+            seg_content = lldb.process.ReadMemory(start_addr, end_addr - start_addr, err)
+            if(seg_content == None):
+                print("Segment empty: @0x{0:016x} (size:UNKNOWN) {1}".format(start_addr, region_name))
+                seg_info['content_file'] = ''
+            else:
+                print("Dumping segment @0x{0:016x} (size:0x{1:x}): {2} [{3}]".format(start_addr, len(seg_content), region_name, repr(seg_info['permissions'])))
+                compressed_seg_content = zlib.compress(seg_content)
+                md5_sum = hashlib.md5(compressed_seg_content).hexdigest() + ".bin"
+                seg_info['content_file'] = md5_sum
+                
+                # Write the compressed contents to disk
+                out_file = open(os.path.join(output_dir, md5_sum), 'wb')
+                out_file.write(compressed_seg_content)
+                out_file.close()
+    
+        except:
+            print("Exception reading segment ({}): {}".format(region_name, sys.exc_info()[0]))
+            
+    return final_segment_list
+
+#----------
+#---- Main    
+    
+def main():
+
+    try:
+        print("----- Unicorn Context Dumper -----")
+        print("You must be actively debugging before running this!")
+        print("If it fails, double check that you are actively debugging before running.")
+        
+        # Create the output directory
+        timestamp = datetime.datetime.fromtimestamp(time.time()).strftime('%Y%m%d_%H%M%S')
+        output_path = "UnicornContext_" + timestamp
+        if not os.path.exists(output_path):
+            os.makedirs(output_path)
+        print("Process context will be output to {}".format(output_path))
+            
+        # Get the context
+        context = {
+            "arch": dump_arch_info(),
+            "regs": dump_regs(), 
+            "segments": dump_process_memory(output_path),
+        }
+    
+        # Write the index file
+        index_file = open(os.path.join(output_path, INDEX_FILE_NAME), 'w')
+        index_file.write(json.dumps(context, indent=4))
+        index_file.close()    
+        print("Done.")
+        
+    except Exception, e:
+        print("!!! ERROR:\n\t{}".format(repr(e)))
+        
+if __name__ == "__main__":
+    main()
+elif lldb.debugger:
+    main()
diff --git a/unicorn_mode/helper_scripts/unicorn_dumper_pwndbg.py b/unicorn_mode/helper_scripts/unicorn_dumper_pwndbg.py
new file mode 100644
index 00000000..bf2367cf
--- /dev/null
+++ b/unicorn_mode/helper_scripts/unicorn_dumper_pwndbg.py
@@ -0,0 +1,224 @@
+"""
+    unicorn_dumper_pwndbg.py
+    
+    When run with GDB sitting at a debug breakpoint, this
+    dumps the current state (registers/memory/etc) of
+    the process to a directory consisting of an index 
+    file with register and segment information and 
+    sub-files containing all actual process memory.
+    
+    The output of this script is expected to be used 
+    to initialize context for Unicorn emulation.
+
+    -----------
+
+    In order to run this script, PWNDBG needs to be running in the GDB session (gdbinit.py)
+    # HELPERS from: https://github.com/pwndbg/pwndbg
+    It can be loaded with:
+      source <path_to_pwndbg>/gdbinit.py
+
+    Call this function when at a breakpoint in your process with:
+      source unicorn_dumper_pwndbg.py
+
+    -----------
+
+
+"""
+
+import datetime
+import hashlib
+import json
+import os
+import sys
+import time
+import zlib
+
+# GDB Python SDK
+import gdb
+
+pwndbg_loaded = False
+
+try:
+    import pwndbg.arch
+    import pwndbg.regs
+    import pwndbg.vmmap
+    import pwndbg.memory
+
+    pwndbg_loaded = True
+
+except ImportError:
+    print("!!! PWNGDB not running in GDB.  Please run gdbinit.py by executing:")
+    print('\tpython execfile ("<path_to_pwndbg>/gdbinit.py")')
+
+# Maximum segment size that we'll store
+# Yep, this could break stuff pretty quickly if we
+# omit something that's used during emulation.
+MAX_SEG_SIZE = 128 * 1024 * 1024
+
+# Name of the index file
+INDEX_FILE_NAME = "_index.json"
+
+#----------------------
+#---- Helper Functions
+
+def map_arch():
+    arch = pwndbg.arch.current # from PWNDBG
+    if 'x86_64' in arch or 'x86-64' in arch:
+        return "x64"
+    elif 'x86' in arch or 'i386' in arch:
+        return "x86"
+    elif 'aarch64' in arch or 'arm64' in arch:
+        return "arm64le"
+    elif 'aarch64_be' in arch:
+        return "arm64be"
+    elif 'arm' in arch:
+        cpsr = pwndbg.regs['cpsr']
+        # check endianess 
+        if pwndbg.arch.endian == 'big':
+            # check for THUMB mode
+            if (cpsr & (1 << 5)):
+                return "armbethumb"
+            else:
+                return "armbe"
+        else:
+            # check for THUMB mode
+            if (cpsr & (1 << 5)):
+                return "armlethumb"
+            else:
+                return "armle"
+    elif 'mips' in arch:
+        if pwndbg.arch.endian == 'little':
+            return 'mipsel'
+        else:
+            return 'mips'
+    else:
+        return ""
+
+
+#-----------------------
+#---- Dumping functions
+
+def dump_arch_info():
+    arch_info = {}
+    arch_info["arch"] = map_arch()
+    return arch_info
+
+
+def dump_regs():
+    reg_state = {}
+    for reg in pwndbg.regs.all:
+        reg_val = pwndbg.regs[reg]
+        # current dumper script looks for register values to be hex strings
+#         reg_str = "0x{:08x}".format(reg_val)
+#         if "64" in get_arch():
+#             reg_str = "0x{:016x}".format(reg_val)
+#         reg_state[reg.strip().strip('$')] = reg_str
+        reg_state[reg.strip().strip('$')] = reg_val
+    return reg_state
+
+
+def dump_process_memory(output_dir):
+    # Segment information dictionary
+    final_segment_list = []
+    
+    # PWNDBG:
+    vmmap = pwndbg.vmmap.get()
+    
+    # Pointer to end of last dumped memory segment
+    segment_last_addr = 0x0;
+
+    start = None
+    end   = None
+
+    if not vmmap:
+        print("No address mapping information found")
+        return final_segment_list
+
+    # Assume segment entries are sorted by start address
+    for entry in vmmap:
+        if entry.start == entry.end:
+            continue
+
+        start = entry.start
+        end   = entry.end
+
+        if (segment_last_addr > entry.start): # indicates overlap
+            if (segment_last_addr > entry.end): # indicates complete overlap, so we skip the segment entirely
+                continue
+            else:            
+                start = segment_last_addr
+            
+        
+        seg_info = {'start': start, 'end': end, 'name': entry.objfile, 'permissions': {
+            "r": entry.read,
+            "w": entry.write,
+            "x": entry.execute
+        }, 'content_file': ''}
+
+        # "(deleted)" may or may not be valid, but don't push it.
+        if entry.read and not '(deleted)' in entry.objfile:
+            try:
+                # Compress and dump the content to a file
+                seg_content = pwndbg.memory.read(start, end - start)
+                if(seg_content == None):
+                    print("Segment empty: @0x{0:016x} (size:UNKNOWN) {1}".format(entry.start, entry.objfile))
+                else:
+                    print("Dumping segment @0x{0:016x} (size:0x{1:x}): {2} [{3}]".format(entry.start, len(seg_content), entry.objfile, repr(seg_info['permissions'])))
+                    compressed_seg_content = zlib.compress(seg_content)
+                    md5_sum = hashlib.md5(compressed_seg_content).hexdigest() + ".bin"
+                    seg_info["content_file"] = md5_sum
+                    
+                    # Write the compressed contents to disk
+                    out_file = open(os.path.join(output_dir, md5_sum), 'wb')
+                    out_file.write(compressed_seg_content)
+                    out_file.close()
+
+            except:
+                print("Exception reading segment ({}): {}".format(entry.objfile, sys.exc_info()[0]))
+        else:
+            print("Skipping segment {0}@0x{1:016x}".format(entry.objfile, entry.start))
+        
+        segment_last_addr = end
+
+        # Add the segment to the list
+        final_segment_list.append(seg_info)
+
+            
+    return final_segment_list
+
+#----------
+#---- Main    
+    
+def main():
+    print("----- Unicorn Context Dumper -----")
+    print("You must be actively debugging before running this!")
+    print("If it fails, double check that you are actively debugging before running.")
+    
+    try:
+
+        # Create the output directory
+        timestamp = datetime.datetime.fromtimestamp(time.time()).strftime('%Y%m%d_%H%M%S')
+        output_path = "UnicornContext_" + timestamp
+        if not os.path.exists(output_path):
+            os.makedirs(output_path)
+        print("Process context will be output to {}".format(output_path))
+            
+        # Get the context
+        context = {
+            "arch": dump_arch_info(),
+            "regs": dump_regs(), 
+            "segments": dump_process_memory(output_path),
+        }
+
+        # Write the index file
+        index_file = open(os.path.join(output_path, INDEX_FILE_NAME), 'w')
+        index_file.write(json.dumps(context, indent=4))
+        index_file.close()    
+        print("Done.")
+        
+    except Exception as e:
+        print("!!! ERROR:\n\t{}".format(repr(e)))
+        
+if __name__ == "__main__" and pwndbg_loaded:
+    main()
+    
diff --git a/unicorn_mode/helper_scripts/unicorn_loader.py b/unicorn_mode/helper_scripts/unicorn_loader.py
new file mode 100644
index 00000000..adf21b64
--- /dev/null
+++ b/unicorn_mode/helper_scripts/unicorn_loader.py
@@ -0,0 +1,560 @@
+"""
+    unicorn_loader.py
+    
+    Loads a process context dumped created using a 
+    Unicorn Context Dumper script into a Unicorn Engine 
+    instance. Once this is performed emulation can be
+    started.
+"""
+
+import argparse
+import binascii
+from collections import namedtuple
+import datetime
+import hashlib
+import json
+import os
+import signal
+import struct
+import time
+import zlib
+
+# Unicorn imports
+from unicorn import *
+from unicorn.arm_const import *
+from unicorn.arm64_const import *
+from unicorn.x86_const import *
+from unicorn.mips_const import *
+
+# Name of the index file
+INDEX_FILE_NAME = "_index.json"
+
+# Page size required by Unicorn
+UNICORN_PAGE_SIZE = 0x1000
+
+# Max allowable segment size (1G)
+MAX_ALLOWABLE_SEG_SIZE = 1024 * 1024 * 1024
+
+# Alignment functions to align all memory segments to Unicorn page boundaries (4KB pages only)
+ALIGN_PAGE_DOWN = lambda x: x & ~(UNICORN_PAGE_SIZE - 1)
+ALIGN_PAGE_UP   = lambda x: (x + UNICORN_PAGE_SIZE - 1) & ~(UNICORN_PAGE_SIZE-1)
+
+#---------------------------------------
+#---- Unicorn-based heap implementation
+
+class UnicornSimpleHeap(object):
+    """ Use this class to provide a simple heap implementation. This should
+        be used if malloc/free calls break things during emulation. This heap also
+        implements basic guard-page capabilities which enable immediate notice of
+        heap overflow and underflows.
+    """
+
+    # Helper data-container used to track chunks
+    class HeapChunk(object):
+        def __init__(self, actual_addr, total_size, data_size):
+            self.total_size = total_size                        # Total size of the chunk (including padding and guard page)
+            self.actual_addr = actual_addr                      # Actual start address of the chunk
+            self.data_size = data_size                          # Size requested by the caller of actual malloc call
+            self.data_addr = actual_addr + UNICORN_PAGE_SIZE    # Address where data actually starts
+
+        # Returns true if the specified buffer is completely within the chunk, else false
+        def is_buffer_in_chunk(self, addr, size):
+            if addr >= self.data_addr and ((addr + size) <= (self.data_addr + self.data_size)):
+                return True
+            else:
+                return False
+
+    # Skip the zero-page to avoid weird potential issues with segment registers
+    HEAP_MIN_ADDR = 0x00002000
+    HEAP_MAX_ADDR = 0xFFFFFFFF
+
+    _uc = None              # Unicorn engine instance to interact with
+    _chunks = []            # List of all known chunks
+    _debug_print = False    # True to print debug information
+
+    def __init__(self, uc, debug_print=False):
+        self._uc = uc
+        self._debug_print = debug_print
+
+        # Add the watchpoint hook that will be used to implement psuedo-guard page support
+        self._uc.hook_add(UC_HOOK_MEM_WRITE | UC_HOOK_MEM_READ, self.__check_mem_access)
+
+    def malloc(self, size):
+        # Figure out the overall size to be allocated/mapped
+        #    - Allocate at least 1 4k page of memory to make Unicorn happy
+        #    - Add guard pages at the start and end of the region
+        total_chunk_size = UNICORN_PAGE_SIZE + ALIGN_PAGE_UP(size) + UNICORN_PAGE_SIZE
+        # Gross but efficient way to find space for the chunk:
+        chunk = None
+        for addr in xrange(self.HEAP_MIN_ADDR, self.HEAP_MAX_ADDR, UNICORN_PAGE_SIZE):
+            try:
+                self._uc.mem_map(addr, total_chunk_size, UC_PROT_READ | UC_PROT_WRITE)
+                chunk = self.HeapChunk(addr, total_chunk_size, size)
+                if self._debug_print:
+                    print("Allocating 0x{0:x}-byte chunk @ 0x{1:016x}".format(chunk.data_size, chunk.data_addr))
+                break
+            except UcError as e:
+                continue
+        # Something went very wrong
+        if chunk == None:
+            return 0    
+        self._chunks.append(chunk)
+        return chunk.data_addr
+
+    def calloc(self, size, count):
+        # Simple wrapper around malloc with calloc() args
+        return self.malloc(size*count)
+
+    def realloc(self, ptr, new_size):
+        # Wrapper around malloc(new_size) / memcpy(new, old, old_size) / free(old)
+        if self._debug_print:
+            print("Reallocating chunk @ 0x{0:016x} to be 0x{1:x} bytes".format(ptr, new_size))
+        old_chunk = None
+        for chunk in self._chunks:
+            if chunk.data_addr == ptr:
+                old_chunk = chunk 
+        new_chunk_addr = self.malloc(new_size) 
+        if old_chunk != None:
+            self._uc.mem_write(new_chunk_addr, str(self._uc.mem_read(old_chunk.data_addr, old_chunk.data_size)))
+            self.free(old_chunk.data_addr)
+        return new_chunk_addr
+
+    def free(self, addr):
+        for chunk in self._chunks:
+            if chunk.is_buffer_in_chunk(addr, 1):
+                if self._debug_print:
+                    print("Freeing 0x{0:x}-byte chunk @ 0x{0:016x}".format(chunk.req_size, chunk.data_addr))
+                self._uc.mem_unmap(chunk.actual_addr, chunk.total_size)
+                self._chunks.remove(chunk)
+                return True
+        return False
+
+    # Implements basic guard-page functionality
+    def __check_mem_access(self, uc, access, address, size, value, user_data):
+        for chunk in self._chunks:
+            if address >= chunk.actual_addr and ((address + size) <= (chunk.actual_addr + chunk.total_size)):
+                if chunk.is_buffer_in_chunk(address, size) == False:
+                    if self._debug_print:
+                        print("Heap over/underflow attempting to {0} 0x{1:x} bytes @ {2:016x}".format( \
+                            "write" if access == UC_MEM_WRITE else "read", size, address))
+                    # Force a memory-based crash
+                    uc.force_crash(UcError(UC_ERR_READ_PROT))
+
+#---------------------------
+#---- Loading function
+
+class AflUnicornEngine(Uc):
+
+    def __init__(self, context_directory, enable_trace=False, debug_print=False):
+        """
+        Initializes an AflUnicornEngine instance, which extends standard the UnicornEngine
+        with a bunch of helper routines that are useful for creating afl-unicorn test harnesses.
+
+        Parameters:
+          - context_directory: Path to the directory generated by one of the context dumper scripts
+          - enable_trace: If True trace information will be printed to STDOUT
+          - debug_print: If True debugging information will be printed while loading the context
+        """
+
+        # Make sure the index file exists and load it
+        index_file_path = os.path.join(context_directory, INDEX_FILE_NAME)
+        if not os.path.isfile(index_file_path):
+            raise Exception("Index file not found. Expected it to be at {}".format(index_file_path))
+
+        # Load the process context from the index file
+        if debug_print:
+            print("Loading process context index from {}".format(index_file_path))
+        index_file = open(index_file_path, 'r')
+        context = json.load(index_file)
+        index_file.close()
+
+        # Check the context to make sure we have the basic essential components
+        if 'arch' not in context:
+            raise Exception("Couldn't find architecture information in index file")
+        if 'regs' not in context:
+            raise Exception("Couldn't find register information in index file")
+        if 'segments' not in context:
+            raise Exception("Couldn't find segment/memory information in index file")
+
+        # Set the UnicornEngine instance's architecture and mode
+        self._arch_str = context['arch']['arch']
+        arch, mode = self.__get_arch_and_mode(self._arch_str)
+        Uc.__init__(self, arch, mode)
+
+        # Load the registers
+        regs = context['regs']
+        reg_map = self.__get_register_map(self._arch_str)
+        for register, value in regs.iteritems():
+            if debug_print:
+                print("Reg {0} = {1}".format(register, value))
+            if not reg_map.has_key(register.lower()):
+                if debug_print:
+                    print("Skipping Reg: {}".format(register))
+            else:
+                reg_write_retry = True
+                try:
+                    self.reg_write(reg_map[register.lower()], value)
+                    reg_write_retry = False
+                except Exception as e:
+                    if debug_print:
+                        print("ERROR writing register: {}, value: {} -- {}".format(register, value, repr(e)))
+
+                if reg_write_retry:
+                    if debug_print:
+                        print("Trying to parse value ({}) as hex string".format(value))
+                    try:
+                        self.reg_write(reg_map[register.lower()], int(value, 16))
+                    except Exception as e:
+                        if debug_print:
+                            print("ERROR writing hex string register: {}, value: {} -- {}".format(register, value, repr(e)))
+                        
+        # Setup the memory map and load memory content
+        self.__map_segments(context['segments'], context_directory, debug_print)
+        
+        if enable_trace:
+            self.hook_add(UC_HOOK_BLOCK, self.__trace_block)
+            self.hook_add(UC_HOOK_CODE, self.__trace_instruction)
+            self.hook_add(UC_HOOK_MEM_WRITE | UC_HOOK_MEM_READ, self.__trace_mem_access)
+            self.hook_add(UC_HOOK_MEM_WRITE_UNMAPPED | UC_HOOK_MEM_READ_INVALID, self.__trace_mem_invalid_access)
+            
+        if debug_print:
+            print("Done loading context.")
+
+    def get_arch(self):
+        return self._arch
+
+    def get_mode(self):
+        return self._mode
+
+    def get_arch_str(self):
+        return self._arch_str
+                    
+    def force_crash(self, uc_error):
+        """ This function should be called to indicate to AFL that a crash occurred during emulation.
+            You can pass the exception received from Uc.emu_start
+        """
+        mem_errors = [
+            UC_ERR_READ_UNMAPPED, UC_ERR_READ_PROT, UC_ERR_READ_UNALIGNED,
+            UC_ERR_WRITE_UNMAPPED, UC_ERR_WRITE_PROT, UC_ERR_WRITE_UNALIGNED,
+            UC_ERR_FETCH_UNMAPPED, UC_ERR_FETCH_PROT, UC_ERR_FETCH_UNALIGNED,
+        ]
+        if uc_error.errno in mem_errors:
+            # Memory error - throw SIGSEGV
+            os.kill(os.getpid(), signal.SIGSEGV)
+        elif uc_error.errno == UC_ERR_INSN_INVALID:
+            # Invalid instruction - throw SIGILL
+            os.kill(os.getpid(), signal.SIGILL)
+        else:
+            # Not sure what happened - throw SIGABRT
+            os.kill(os.getpid(), signal.SIGABRT)
+
+    def dump_regs(self):
+        """ Dumps the contents of all the registers to STDOUT """
+        for reg in sorted(self.__get_register_map(self._arch_str).items(), key=lambda reg: reg[0]):
+            print(">>> {0:>4}: 0x{1:016x}".format(reg[0], self.reg_read(reg[1])))
+
+    # TODO: Make this dynamically get the stack pointer register and pointer width for the current architecture
+    """
+    def dump_stack(self, window=10):
+        print(">>> Stack:")
+        stack_ptr_addr = self.reg_read(UC_X86_REG_RSP)
+        for i in xrange(-window, window + 1):
+            addr = stack_ptr_addr + (i*8)
+            print("{0}0x{1:016x}: 0x{2:016x}".format( \
+                'SP->' if i == 0 else '    ', addr, \
+                struct.unpack('<Q', self.mem_read(addr, 8))[0]))
+    """
+
+    #-----------------------------
+    #---- Loader Helper Functions
+
+    def __map_segment(self, name, address, size, perms, debug_print=False):
+        # - size is unsigned and must be != 0
+        # - starting address must be aligned to 4KB
+        # - map size must be multiple of the page size (4KB)
+        mem_start = address
+        mem_end = address + size
+        mem_start_aligned = ALIGN_PAGE_DOWN(mem_start)
+        mem_end_aligned = ALIGN_PAGE_UP(mem_end)
+        if debug_print:
+            if mem_start_aligned != mem_start or mem_end_aligned != mem_end:
+                print("Aligning segment to page boundary:")
+                print("  name:  {}".format(name))
+                print("  start: {0:016x} -> {1:016x}".format(mem_start, mem_start_aligned))
+                print("  end:   {0:016x} -> {1:016x}".format(mem_end, mem_end_aligned))
+            print("Mapping segment from {0:016x} - {1:016x} with perm={2}: {3}".format(mem_start_aligned, mem_end_aligned, perms, name))
+        if(mem_start_aligned < mem_end_aligned):
+            self.mem_map(mem_start_aligned, mem_end_aligned - mem_start_aligned, perms)
+
+
+    def __map_segments(self, segment_list, context_directory, debug_print=False):
+        for segment in segment_list:
+            
+            # Get the segment information from the index
+            name = segment['name']
+            seg_start = segment['start']
+            seg_end = segment['end']
+            perms = \
+                (UC_PROT_READ  if segment['permissions']['r'] == True else 0) | \
+                (UC_PROT_WRITE if segment['permissions']['w'] == True else 0) | \
+                (UC_PROT_EXEC  if segment['permissions']['x'] == True else 0)        
+
+            if debug_print:
+                print("Handling segment {}".format(name))
+
+            # Check for any overlap with existing segments. If there is, it must
+            # be consolidated and merged together before mapping since Unicorn
+            # doesn't allow overlapping segments.
+            found = False
+            overlap_start = False
+            overlap_end = False
+            tmp = 0
+            for (mem_start, mem_end, mem_perm) in self.mem_regions():
+                mem_end = mem_end + 1
+                if seg_start >= mem_start and seg_end < mem_end:
+                    found = True
+                    break
+                if seg_start >= mem_start and seg_start < mem_end:
+                    overlap_start = True
+                    tmp = mem_end
+                    break
+                if seg_end >= mem_start and seg_end < mem_end:
+                    overlap_end = True
+                    tmp = mem_start
+                    break
+
+            # Map memory into the address space if it is of an acceptable size.
+            if (seg_end - seg_start) > MAX_ALLOWABLE_SEG_SIZE:
+                if debug_print:
+                    print("Skipping segment (LARGER THAN {0}) from {1:016x} - {2:016x} with perm={3}: {4}".format(MAX_ALLOWABLE_SEG_SIZE, seg_start, seg_end, perms, name))
+                continue
+            elif not found:           # Make sure it's not already mapped
+                if overlap_start:     # Partial overlap (start)
+                    self.__map_segment(name, tmp, seg_end - tmp, perms, debug_print)
+                elif overlap_end:       # Patrial overlap (end)
+                    self.__map_segment(name, seg_start, tmp - seg_start, perms, debug_print)
+                else:                   # Not found
+                    self.__map_segment(name, seg_start, seg_end - seg_start, perms, debug_print)
+            else:
+                if debug_print:
+                    print("Segment {} already mapped. Moving on.".format(name))
+
+            # Load the content (if available)
+            if 'content_file' in segment and len(segment['content_file']) > 0:
+                content_file_path = os.path.join(context_directory, segment['content_file'])
+                if not os.path.isfile(content_file_path):
+                    raise Exception("Unable to find segment content file. Expected it to be at {}".format(content_file_path))
+                #if debug_print:
+                #    print("Loading content for segment {} from {}".format(name, segment['content_file']))
+                content_file = open(content_file_path, 'rb')
+                compressed_content = content_file.read()
+                content_file.close()
+                self.mem_write(seg_start, zlib.decompress(compressed_content)) 
+
+            else:
+                if debug_print:
+                    print("No content found for segment {0} @ {1:016x}".format(name, seg_start))
+                self.mem_write(seg_start, '\x00' * (seg_end - seg_start))
+
+    def __get_arch_and_mode(self, arch_str):
+        arch_map = {
+            "x64"       : [ UC_X86_REG_RIP,     UC_ARCH_X86,    UC_MODE_64 ],
+            "x86"       : [ UC_X86_REG_EIP,     UC_ARCH_X86,    UC_MODE_32 ],
+            "arm64be"   : [ UC_ARM64_REG_PC,    UC_ARCH_ARM64,  UC_MODE_ARM | UC_MODE_BIG_ENDIAN ],
+            "arm64le"   : [ UC_ARM64_REG_PC,    UC_ARCH_ARM64,  UC_MODE_ARM | UC_MODE_LITTLE_ENDIAN ],
+            "armbe"     : [ UC_ARM_REG_PC,      UC_ARCH_ARM,    UC_MODE_ARM | UC_MODE_BIG_ENDIAN ],
+            "armle"     : [ UC_ARM_REG_PC,      UC_ARCH_ARM,    UC_MODE_ARM | UC_MODE_LITTLE_ENDIAN ],
+            "armbethumb": [ UC_ARM_REG_PC,      UC_ARCH_ARM,    UC_MODE_THUMB | UC_MODE_BIG_ENDIAN ],
+            "armlethumb": [ UC_ARM_REG_PC,      UC_ARCH_ARM,    UC_MODE_THUMB | UC_MODE_LITTLE_ENDIAN ],
+            "mips"      : [ UC_MIPS_REG_PC,     UC_ARCH_MIPS,   UC_MODE_MIPS32 | UC_MODE_BIG_ENDIAN ],
+            "mipsel"    : [ UC_MIPS_REG_PC,     UC_ARCH_MIPS,   UC_MODE_MIPS32 | UC_MODE_LITTLE_ENDIAN ],
+        }
+        return (arch_map[arch_str][1], arch_map[arch_str][2])
+
+    def __get_register_map(self, arch):
+        if arch == "arm64le" or arch == "arm64be":
+            arch = "arm64"
+        elif arch == "armle" or arch == "armbe" or "thumb" in arch:
+            arch = "arm"
+        elif arch == "mipsel":
+            arch = "mips"
+
+        registers = {
+            "x64" : {
+                "rax":    UC_X86_REG_RAX,
+                "rbx":    UC_X86_REG_RBX,
+                "rcx":    UC_X86_REG_RCX,
+                "rdx":    UC_X86_REG_RDX,
+                "rsi":    UC_X86_REG_RSI,
+                "rdi":    UC_X86_REG_RDI,
+                "rbp":    UC_X86_REG_RBP,
+                "rsp":    UC_X86_REG_RSP,
+                "r8":     UC_X86_REG_R8,
+                "r9":     UC_X86_REG_R9,
+                "r10":    UC_X86_REG_R10,
+                "r11":    UC_X86_REG_R11,
+                "r12":    UC_X86_REG_R12,
+                "r13":    UC_X86_REG_R13,
+                "r14":    UC_X86_REG_R14,
+                "r15":    UC_X86_REG_R15,
+                "rip":    UC_X86_REG_RIP,
+                "rsp":    UC_X86_REG_RSP,
+                "efl":    UC_X86_REG_EFLAGS,
+                "cs":     UC_X86_REG_CS,
+                "ds":     UC_X86_REG_DS,
+                "es":     UC_X86_REG_ES,
+                "fs":     UC_X86_REG_FS,
+                "gs":     UC_X86_REG_GS,
+                "ss":     UC_X86_REG_SS,
+            },
+            "x86" : {
+                "eax":    UC_X86_REG_EAX,
+                "ebx":    UC_X86_REG_EBX,
+                "ecx":    UC_X86_REG_ECX,
+                "edx":    UC_X86_REG_EDX,
+                "esi":    UC_X86_REG_ESI,
+                "edi":    UC_X86_REG_EDI,
+                "ebp":    UC_X86_REG_EBP,
+                "esp":    UC_X86_REG_ESP,
+                "eip":    UC_X86_REG_EIP,
+                "esp":    UC_X86_REG_ESP,
+                "efl":    UC_X86_REG_EFLAGS,        
+                # Segment registers removed...
+                # They caused segfaults (from unicorn?) when they were here
+            },        
+            "arm" : {
+                "r0":     UC_ARM_REG_R0,
+                "r1":     UC_ARM_REG_R1,
+                "r2":     UC_ARM_REG_R2,
+                "r3":     UC_ARM_REG_R3,
+                "r4":     UC_ARM_REG_R4,
+                "r5":     UC_ARM_REG_R5,
+                "r6":     UC_ARM_REG_R6,
+                "r7":     UC_ARM_REG_R7,
+                "r8":     UC_ARM_REG_R8,
+                "r9":     UC_ARM_REG_R9,
+                "r10":    UC_ARM_REG_R10,
+                "r11":    UC_ARM_REG_R11,
+                "r12":    UC_ARM_REG_R12,
+                "pc":     UC_ARM_REG_PC,
+                "sp":     UC_ARM_REG_SP,
+                "lr":     UC_ARM_REG_LR,
+                "cpsr":   UC_ARM_REG_CPSR
+            },
+            "arm64" : {
+                "x0":     UC_ARM64_REG_X0,
+                "x1":     UC_ARM64_REG_X1,
+                "x2":     UC_ARM64_REG_X2,
+                "x3":     UC_ARM64_REG_X3,
+                "x4":     UC_ARM64_REG_X4,
+                "x5":     UC_ARM64_REG_X5,
+                "x6":     UC_ARM64_REG_X6,
+                "x7":     UC_ARM64_REG_X7,
+                "x8":     UC_ARM64_REG_X8,
+                "x9":     UC_ARM64_REG_X9,
+                "x10":    UC_ARM64_REG_X10,
+                "x11":    UC_ARM64_REG_X11,
+                "x12":    UC_ARM64_REG_X12,
+                "x13":    UC_ARM64_REG_X13,
+                "x14":    UC_ARM64_REG_X14,
+                "x15":    UC_ARM64_REG_X15,
+                "x16":    UC_ARM64_REG_X16,
+                "x17":    UC_ARM64_REG_X17,
+                "x18":    UC_ARM64_REG_X18,
+                "x19":    UC_ARM64_REG_X19,
+                "x20":    UC_ARM64_REG_X20,
+                "x21":    UC_ARM64_REG_X21,
+                "x22":    UC_ARM64_REG_X22,
+                "x23":    UC_ARM64_REG_X23,
+                "x24":    UC_ARM64_REG_X24,
+                "x25":    UC_ARM64_REG_X25,
+                "x26":    UC_ARM64_REG_X26,
+                "x27":    UC_ARM64_REG_X27,
+                "x28":    UC_ARM64_REG_X28,
+                "pc":     UC_ARM64_REG_PC,
+                "sp":     UC_ARM64_REG_SP,
+                "fp":     UC_ARM64_REG_FP,
+                "lr":     UC_ARM64_REG_LR,
+                "nzcv":   UC_ARM64_REG_NZCV,
+                "cpsr": UC_ARM_REG_CPSR, 
+            },
+            "mips" : {
+                "0" :     UC_MIPS_REG_ZERO,
+                "at":     UC_MIPS_REG_AT,
+                "v0":     UC_MIPS_REG_V0,
+                "v1":     UC_MIPS_REG_V1,
+                "a0":     UC_MIPS_REG_A0,
+                "a1":     UC_MIPS_REG_A1,
+                "a2":     UC_MIPS_REG_A2,
+                "a3":     UC_MIPS_REG_A3,
+                "t0":     UC_MIPS_REG_T0,
+                "t1":     UC_MIPS_REG_T1,
+                "t2":     UC_MIPS_REG_T2,
+                "t3":     UC_MIPS_REG_T3,
+                "t4":     UC_MIPS_REG_T4,
+                "t5":     UC_MIPS_REG_T5,
+                "t6":     UC_MIPS_REG_T6,
+                "t7":     UC_MIPS_REG_T7,
+                "t8":     UC_MIPS_REG_T8,
+                "t9":     UC_MIPS_REG_T9,
+                "s0":     UC_MIPS_REG_S0,
+                "s1":     UC_MIPS_REG_S1,
+                "s2":     UC_MIPS_REG_S2,    
+                "s3":     UC_MIPS_REG_S3,
+                "s4":     UC_MIPS_REG_S4,
+                "s5":     UC_MIPS_REG_S5,
+                "s6":     UC_MIPS_REG_S6,              
+                "s7":     UC_MIPS_REG_S7,
+                "s8":     UC_MIPS_REG_S8,  
+                "k0":     UC_MIPS_REG_K0,
+                "k1":     UC_MIPS_REG_K1,
+                "gp":     UC_MIPS_REG_GP,
+                "pc":     UC_MIPS_REG_PC,
+                "sp":     UC_MIPS_REG_SP,
+                "fp":     UC_MIPS_REG_FP,
+                "ra":     UC_MIPS_REG_RA,
+                "hi":     UC_MIPS_REG_HI,
+                "lo":     UC_MIPS_REG_LO
+            }
+        }
+        return registers[arch]   
+
+    #---------------------------
+    # Callbacks for tracing 
+
+    # TODO: Make integer-printing fixed widths dependent on bitness of architecture 
+    #       (i.e. only show 4 bytes for 32-bit, 8 bytes for 64-bit)
+
+    # TODO: Figure out how best to determine the capstone mode and architecture here
+    """
+    try:
+        # If Capstone is installed then we'll dump disassembly, otherwise just dump the binary.
+        from capstone import *
+        cs = Cs(CS_ARCH_MIPS, CS_MODE_MIPS32 + CS_MODE_BIG_ENDIAN)
+        def __trace_instruction(self, uc, address, size, user_data):
+            mem = uc.mem_read(address, size)
+            for (cs_address, cs_size, cs_mnemonic, cs_opstr) in cs.disasm_lite(bytes(mem), size):
+                print("    Instr: {:#016x}:\t{}\t{}".format(address, cs_mnemonic, cs_opstr))
+    except ImportError:
+        def __trace_instruction(self, uc, address, size, user_data):
+            print("    Instr: addr=0x{0:016x}, size=0x{1:016x}".format(address, size))    
+    """
+
+    def __trace_instruction(self, uc, address, size, user_data):
+        print("    Instr: addr=0x{0:016x}, size=0x{1:016x}".format(address, size))  
+        
+    def __trace_block(self, uc, address, size, user_data):
+        print("Basic Block: addr=0x{0:016x}, size=0x{1:016x}".format(address, size))
+      
+    def __trace_mem_access(self, uc, access, address, size, value, user_data):
+        if access == UC_MEM_WRITE:
+            print("        >>> Write: addr=0x{0:016x} size={1} data=0x{2:016x}".format(address, size, value))
+        else:
+            print("        >>> Read: addr=0x{0:016x} size={1}".format(address, size))    
+
+    def __trace_mem_invalid_access(self, uc, access, address, size, value, user_data):
+        if access == UC_MEM_WRITE_UNMAPPED:
+            print("        >>> INVALID Write: addr=0x{0:016x} size={1} data=0x{2:016x}".format(address, size, value))
+        else:
+            print("        >>> INVALID Read: addr=0x{0:016x} size={1}".format(address, size))   
+
diff --git a/unicorn_mode/patches/afl-unicorn-cpu-inl.h b/unicorn_mode/patches/afl-unicorn-cpu-inl.h
new file mode 100644
index 00000000..892c3f72
--- /dev/null
+++ b/unicorn_mode/patches/afl-unicorn-cpu-inl.h
@@ -0,0 +1,290 @@
+/*
+   american fuzzy lop - high-performance binary-only instrumentation
+   -----------------------------------------------------------------
+
+   Written by Andrew Griffiths <agriffiths@google.com> and
+              Michal Zalewski <lcamtuf@google.com>
+
+   TCG instrumentation and block chaining support by Andrea Biondo
+                                      <andrea.biondo965@gmail.com>
+   Adapted for afl-unicorn by Dominik Maier <mail@dmnk.co>
+
+   Idea & design very much by Andrew Griffiths.
+
+   Copyright 2015, 2016 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 Unicorn 1.0.1. 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 <sys/shm.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include "../../config.h"
+
+/***************************
+ * VARIOUS AUXILIARY STUFF *
+ ***************************/
+
+/* A snippet patched into tb_find_slow to inform the parent process that
+   we have hit a new block that hasn't been translated yet, and to tell
+   it to translate within its own context, too (this avoids translation
+   overhead in the next forked-off copy). */
+
+#define AFL_UNICORN_CPU_SNIPPET1 do { \
+    afl_request_tsl(pc, cs_base, flags); \
+  } while (0)
+
+/* This snippet kicks in when the instruction pointer is positioned at
+   _start and does the usual forkserver stuff, not very different from
+   regular instrumentation injected via afl-as.h. */
+
+#define AFL_UNICORN_CPU_SNIPPET2 do { \
+    if(unlikely(afl_first_instr == 0)) { \
+      afl_setup(); \
+      afl_forkserver(env); \
+      afl_first_instr = 1; \
+    } \
+    afl_maybe_log(tb->pc); \
+  } while (0)
+
+/* We use one additional file descriptor to relay "needs translation"
+   messages between the child and the fork server. */
+
+#define TSL_FD (FORKSRV_FD - 1)
+
+/* This is equivalent to afl-as.h: */
+
+static unsigned char *afl_area_ptr;
+
+/* Set in the child process in forkserver mode: */
+
+static unsigned char afl_fork_child;
+static unsigned int afl_forksrv_pid;
+
+/* Instrumentation ratio: */
+
+static unsigned int afl_inst_rms = MAP_SIZE;
+
+/* Function declarations. */
+
+static void afl_setup(void);
+static void afl_forkserver(CPUArchState*);
+static inline void afl_maybe_log(unsigned long);
+
+static void afl_wait_tsl(CPUArchState*, int);
+static void afl_request_tsl(target_ulong, target_ulong, uint64_t);
+
+static TranslationBlock *tb_find_slow(CPUArchState*, target_ulong,
+                                      target_ulong, uint64_t);
+
+/* Data structure passed around by the translate handlers: */
+
+struct afl_tsl {
+  target_ulong pc;
+  target_ulong cs_base;
+  uint64_t flags;
+};
+
+/*************************
+ * ACTUAL IMPLEMENTATION *
+ *************************/
+
+/* Set up SHM region and initialize other stuff. */
+
+static void afl_setup(void) {
+
+  char *id_str = getenv(SHM_ENV_VAR),
+       *inst_r = getenv("AFL_INST_RATIO");
+
+  int shm_id;
+
+  if (inst_r) {
+
+    unsigned int r;
+
+    r = atoi(inst_r);
+
+    if (r > 100) r = 100;
+    if (!r) r = 1;
+
+    afl_inst_rms = MAP_SIZE * r / 100;
+
+  }
+
+  if (id_str) {
+
+    shm_id = atoi(id_str);
+    afl_area_ptr = shmat(shm_id, NULL, 0);
+
+    if (afl_area_ptr == (void*)-1) exit(1);
+
+    /* With AFL_INST_RATIO set to a low value, we want to touch the bitmap
+       so that the parent doesn't give up on us. */
+
+    if (inst_r) afl_area_ptr[0] = 1;
+  }
+}
+
+/* Fork server logic, invoked once we hit first emulated instruction. */
+
+static void afl_forkserver(CPUArchState *env) {
+
+  static unsigned char tmp[4];
+
+  if (!afl_area_ptr) return;
+
+  /* Tell the parent that we're alive. If the parent doesn't want
+     to talk, assume that we're not running in forkserver mode. */
+
+  if (write(FORKSRV_FD + 1, tmp, 4) != 4) return;
+
+  afl_forksrv_pid = getpid();
+
+  /* All right, let's await orders... */
+
+  while (1) {
+
+    pid_t child_pid;
+    int status, t_fd[2];
+
+    /* Whoops, parent dead? */
+
+    if (read(FORKSRV_FD, tmp, 4) != 4) exit(2);
+
+    /* Establish a channel with child to grab translation commands. We'll 
+       read from t_fd[0], child will write to TSL_FD. */
+
+    if (pipe(t_fd) || dup2(t_fd[1], TSL_FD) < 0) exit(3);
+    close(t_fd[1]);
+
+    child_pid = fork();
+    if (child_pid < 0) exit(4);
+
+    if (!child_pid) {
+
+      /* Child process. Close descriptors and run free. */
+
+      afl_fork_child = 1;
+      close(FORKSRV_FD);
+      close(FORKSRV_FD + 1);
+      close(t_fd[0]);
+      return;
+
+    }
+
+    /* Parent. */
+
+    close(TSL_FD);
+
+    if (write(FORKSRV_FD + 1, &child_pid, 4) != 4) exit(5);
+
+    /* Collect translation requests until child dies and closes the pipe. */
+
+    afl_wait_tsl(env, t_fd[0]);
+
+    /* Get and relay exit status to parent. */
+
+    if (waitpid(child_pid, &status, 0) < 0) exit(6);
+    if (write(FORKSRV_FD + 1, &status, 4) != 4) exit(7);
+
+  }
+
+}
+
+
+/* The equivalent of the tuple logging routine from afl-as.h. */
+
+static inline void afl_maybe_log(unsigned long cur_loc) {
+
+  static __thread unsigned long prev_loc;
+
+  // DEBUG
+  //printf("IN AFL_MAYBE_LOG 0x%lx\n", cur_loc);
+
+  // MODIFIED FOR UNICORN MODE -> We want to log all addresses,
+  // so the checks for 'start < addr < end' are removed
+  if(!afl_area_ptr)
+    return;
+
+  // DEBUG
+  //printf("afl_area_ptr = %p\n", afl_area_ptr);
+
+  /* Looks like QEMU always maps to fixed locations, so ASAN is not a
+     concern. Phew. But instruction addresses may be aligned. Let's mangle
+     the value to get something quasi-uniform. */
+
+  cur_loc  = (cur_loc >> 4) ^ (cur_loc << 8);
+  cur_loc &= MAP_SIZE - 1;
+
+  /* Implement probabilistic instrumentation by looking at scrambled block
+     address. This keeps the instrumented locations stable across runs. */
+
+  // DEBUG
+  //printf("afl_inst_rms = 0x%lx\n", afl_inst_rms);
+
+  if (cur_loc >= afl_inst_rms) return;
+
+  // DEBUG
+  //printf("cur_loc = 0x%lx\n", cur_loc);  
+
+  afl_area_ptr[cur_loc ^ prev_loc]++;
+  prev_loc = cur_loc >> 1;
+
+}
+
+
+/* This code is invoked whenever QEMU decides that it doesn't have a
+   translation of a particular block and needs to compute it. When this happens,
+   we tell the parent to mirror the operation, so that the next fork() has a
+   cached copy. */
+
+static void afl_request_tsl(target_ulong pc, target_ulong cb, uint64_t flags) {
+
+  struct afl_tsl t;
+
+  if (!afl_fork_child) return;
+
+  t.pc      = pc;
+  t.cs_base = cb;
+  t.flags   = flags;
+
+  if (write(TSL_FD, &t, sizeof(struct afl_tsl)) != sizeof(struct afl_tsl))
+    return;
+
+}
+
+
+/* This is the other side of the same channel. Since timeouts are handled by
+   afl-fuzz simply killing the child, we can just wait until the pipe breaks. */
+
+static void afl_wait_tsl(CPUArchState *env, int fd) {
+
+  struct afl_tsl t;
+
+  while (1) {
+
+    /* Broken pipe means it's time to return to the fork server routine. */
+
+    if (read(fd, &t, sizeof(struct afl_tsl)) != sizeof(struct afl_tsl))
+      break;
+
+    tb_find_slow(env, t.pc, t.cs_base, t.flags);
+  }
+
+  close(fd);
+}
+
diff --git a/unicorn_mode/patches/patches.diff b/unicorn_mode/patches/patches.diff
new file mode 100644
index 00000000..71a1e2f3
--- /dev/null
+++ b/unicorn_mode/patches/patches.diff
@@ -0,0 +1,107 @@
+diff --git a/Makefile b/Makefile
+index 7d73782..fb3ccfd 100644
+--- a/Makefile
++++ b/Makefile
+@@ -88,6 +88,10 @@ AR = llvm-ar
+ LDFLAGS := -fsanitize=address ${LDFLAGS}
+ endif
+ 
++ifeq ($(UNICORN_AFL),yes)
++UNICORN_CFLAGS += -DUNICORN_AFL
++endif
++
+ ifeq ($(CROSS),)
+ CC ?= cc
+ AR ?= ar
+diff --git a/config.mk b/config.mk
+index c3621fb..c7b4f7e 100644
+--- a/config.mk
++++ b/config.mk
+@@ -8,7 +8,7 @@
+ # Compile with debug info when you want to debug code.
+ # Change this to 'no' for release edition.
+ 
+-UNICORN_DEBUG ?= yes
++UNICORN_DEBUG ?= no
+ 
+ ################################################################################
+ # Specify which archs you want to compile in. By default, we build all archs.
+@@ -28,3 +28,9 @@ UNICORN_STATIC ?= yes
+ # a shared library.
+ 
+ UNICORN_SHARED ?= yes
++
++
++################################################################################
++# Changing 'UNICORN_AFLL = yes' to 'UNICORN_AFL = no' disables AFL instrumentation
++
++UNICORN_AFL ?= yes
+diff --git a/qemu/cpu-exec.c b/qemu/cpu-exec.c
+index 7755adf..8114b70 100644
+--- a/qemu/cpu-exec.c
++++ b/qemu/cpu-exec.c
+@@ -24,6 +24,11 @@
+ 
+ #include "uc_priv.h"
+ 
++#if defined(UNICORN_AFL)
++#include "../afl-unicorn-cpu-inl.h"
++static int afl_first_instr = 0;
++#endif 
++
+ static tcg_target_ulong cpu_tb_exec(CPUState *cpu, uint8_t *tb_ptr);
+ static TranslationBlock *tb_find_slow(CPUArchState *env, target_ulong pc,
+         target_ulong cs_base, uint64_t flags);
+@@ -231,6 +236,10 @@ int cpu_exec(struct uc_struct *uc, CPUArchState *env)   // qq
+                             next_tb & TB_EXIT_MASK, tb);
+                 }
+ 
++#if defined(UNICORN_AFL)
++                AFL_UNICORN_CPU_SNIPPET2;
++#endif
++
+                 /* cpu_interrupt might be called while translating the
+                    TB, but before it is linked into a potentially
+                    infinite loop and becomes env->current_tb. Avoid
+@@ -369,6 +378,11 @@ static TranslationBlock *tb_find_slow(CPUArchState *env, target_ulong pc,
+ not_found:
+     /* if no translated code available, then translate it now */
+     tb = tb_gen_code(cpu, pc, cs_base, (int)flags, 0);   // qq
++    
++#if defined(UNICORN_AFL)
++    /* There seems to be no chaining in unicorn ever? :( */
++    AFL_UNICORN_CPU_SNIPPET1;
++#endif
+ 
+ found:
+     /* Move the last found TB to the head of the list */
+diff --git a/qemu/translate-all.c b/qemu/translate-all.c
+index 1a96c34..7ef4878 100644
+--- a/qemu/translate-all.c
++++ b/qemu/translate-all.c
+@@ -403,11 +403,25 @@ static PageDesc *page_find_alloc(struct uc_struct *uc, tb_page_addr_t index, int
+ 
+ #if defined(CONFIG_USER_ONLY)
+     /* We can't use g_malloc because it may recurse into a locked mutex. */
++#if defined(UNICORN_AFL)
++    /* This was added by unicorn-afl to bail out semi-gracefully if out of memory. */
++# define ALLOC(P, SIZE)                                 \
++    do {                                                \
++        void* _tmp = mmap(NULL, SIZE, PROT_READ | PROT_WRITE,    \
++                 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);   \
++        if (_tmp == (void*)-1) { \
++            qemu_log(">>> Out of memory for stack, bailing out. <<<\n"); \
++            exit(1); \
++        } \
++        (P) = _tmp; \
++    } while (0)
++#else /* !UNICORN_AFL */
+ # define ALLOC(P, SIZE)                                 \
+     do {                                                \
+         P = mmap(NULL, SIZE, PROT_READ | PROT_WRITE,    \
+                  MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);   \
+     } while (0)
++#endif /* UNICORN_AFL */
+ #else
+ # define ALLOC(P, SIZE) \
+     do { P = g_malloc0(SIZE); } while (0)
diff --git a/unicorn_mode/samples/simple/COMPILE.md b/unicorn_mode/samples/simple/COMPILE.md
new file mode 100644
index 00000000..bd4a66c6
--- /dev/null
+++ b/unicorn_mode/samples/simple/COMPILE.md
@@ -0,0 +1,41 @@
+Compiling simple_target.c
+==========================
+
+You shouldn't need to compile simple_target.c since a MIPS binary version is
+pre-built and shipped with afl-unicorn. This file documents how the binary
+was built in case you want to rebuild it or recompile it for any reason.
+
+The pre-built binary (simple_target.bin) was built by cross-compiling 
+simple_target.c for MIPS using the mips-linux-gnu-gcc package on an Ubuntu
+16.04 LTS system. This cross compiler (and associated binutils) was installed
+from apt-get packages:
+
+```
+sudo apt-get install gcc-mips-linux-gnu
+```
+
+simple_target.c was compiled without optimization, position-independent,
+and without standard libraries using the following command line:
+
+```
+mips-linux-gnu-gcc -o simple_target.elf simple_target.c -fPIC -O0 -nostdlib
+```
+
+The .text section from the resulting ELF binary was then extracted to create
+the raw binary blob that is loaded and emulated by simple_test_harness.py:
+
+```
+mips-linux-gnu-objcopy -O binary --only-section=.text simple_target.elf simple_target.bin 
+```
+
+In summary, to recreate simple_taget.bin execute the following:
+
+```
+mips-linux-gnu-gcc -o simple_target.elf simple_target.c -fPIC -O0 -nostdlib
+  && mips-linux-gnu-objcopy -O binary --only-section=.text simple_target.elf simple_target.bin 
+    && rm simple_target.elf
+```
+
+Note that the output of this is padded with nulls for 16-byte alignment. This is 
+important when emulating it, as NOPs will be added after the return of main()
+as necessary.
\ No newline at end of file
diff --git a/unicorn_mode/samples/simple/in/a b/unicorn_mode/samples/simple/in/a
new file mode 100644
index 00000000..78981922
--- /dev/null
+++ b/unicorn_mode/samples/simple/in/a
@@ -0,0 +1 @@
+a
diff --git a/unicorn_mode/samples/simple/out/.cur_input b/unicorn_mode/samples/simple/out/.cur_input
new file mode 100644
index 00000000..2e65efe2
--- /dev/null
+++ b/unicorn_mode/samples/simple/out/.cur_input
@@ -0,0 +1 @@
+a
\ No newline at end of file
diff --git a/unicorn_mode/samples/simple/out/cmdline b/unicorn_mode/samples/simple/out/cmdline
new file mode 100644
index 00000000..69429f9f
--- /dev/null
+++ b/unicorn_mode/samples/simple/out/cmdline
@@ -0,0 +1,3 @@
+python
+../samples/simple/simple_test_harness.py
+../samples/simple/sample_inputs
diff --git a/unicorn_mode/samples/simple/out/fuzz_bitmap b/unicorn_mode/samples/simple/out/fuzz_bitmap
new file mode 100644
index 00000000..6b9ee1f2
--- /dev/null
+++ b/unicorn_mode/samples/simple/out/fuzz_bitmap
@@ -0,0 +1 @@
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ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ
\ No newline at end of file
diff --git a/unicorn_mode/samples/simple/out/fuzzer_stats b/unicorn_mode/samples/simple/out/fuzzer_stats
new file mode 100644
index 00000000..6deca073
--- /dev/null
+++ b/unicorn_mode/samples/simple/out/fuzzer_stats
@@ -0,0 +1,28 @@
+start_time        : 1563137991
+last_update       : 1563155870
+fuzzer_pid        : 16972
+cycles_done       : 86
+execs_done        : 4807
+execs_per_sec     : 0.00
+paths_total       : 1
+paths_favored     : 1
+paths_found       : 0
+paths_imported    : 0
+max_depth         : 1
+cur_path          : 0
+pending_favs      : 0
+pending_total     : 0
+variable_paths    : 0
+stability         : 100.00%
+bitmap_cvg        : 0.00%
+unique_crashes    : 0
+unique_hangs      : 0
+last_path         : 0
+last_crash        : 0
+last_hang         : 0
+execs_since_crash : 4807
+exec_timeout      : 9999999
+afl_banner        : python
+afl_version       : 2.52b
+target_mode       : unicorn
+command_line      : /mnt/c/Users/DMaier/tmp/afl-unicorn/afl-fuzz -U -m none -t 9999999 -i ../samples/simple/in -o ../samples/simple/out -- python ../samples/simple/simple_test_harness.py ../samples/simple/sample_inputs
diff --git a/unicorn_mode/samples/simple/out/plot_data b/unicorn_mode/samples/simple/out/plot_data
new file mode 100644
index 00000000..8963aa8b
--- /dev/null
+++ b/unicorn_mode/samples/simple/out/plot_data
@@ -0,0 +1,7 @@
+# unix_time, cycles_done, cur_path, paths_total, pending_total, pending_favs, map_size, unique_crashes, unique_hangs, max_depth, execs_per_sec
+1563154187, 0, 0, 1, 1, 1, 0.00%, 0, 0, 1, inf
+1563154197, 2, 0, 1, 0, 0, 0.00%, 0, 0, 1, 36.23
+1563154202, 9, 0, 1, 0, 0, 0.00%, 0, 0, 1, 32.83
+1563154207, 15, 0, 1, 0, 0, 0.00%, 0, 0, 1, 31.33
+1563154212, 22, 0, 1, 0, 0, 0.00%, 0, 0, 1, 31.05
+1563154217, 29, 0, 1, 0, 0, 0.00%, 0, 0, 1, 33.90
diff --git a/unicorn_mode/samples/simple/out/queue/.state/deterministic_done/id:000000,orig:a b/unicorn_mode/samples/simple/out/queue/.state/deterministic_done/id:000000,orig:a
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/unicorn_mode/samples/simple/out/queue/.state/deterministic_done/id:000000,orig:a
diff --git a/unicorn_mode/samples/simple/out/queue/id:000000,orig:a b/unicorn_mode/samples/simple/out/queue/id:000000,orig:a
new file mode 100644
index 00000000..78981922
--- /dev/null
+++ b/unicorn_mode/samples/simple/out/queue/id:000000,orig:a
@@ -0,0 +1 @@
+a
diff --git a/unicorn_mode/samples/simple/sample_inputs/sample1.bin b/unicorn_mode/samples/simple/sample_inputs/sample1.bin
new file mode 100644
index 00000000..85df5078
--- /dev/null
+++ b/unicorn_mode/samples/simple/sample_inputs/sample1.bin
@@ -0,0 +1 @@
+abcd
\ No newline at end of file
diff --git a/unicorn_mode/samples/simple/sample_inputs/sample2.bin b/unicorn_mode/samples/simple/sample_inputs/sample2.bin
new file mode 100644
index 00000000..f76dd238
--- /dev/null
+++ b/unicorn_mode/samples/simple/sample_inputs/sample2.bin
diff --git a/unicorn_mode/samples/simple/sample_inputs/sample3.bin b/unicorn_mode/samples/simple/sample_inputs/sample3.bin
new file mode 100644
index 00000000..6b2aaa76
--- /dev/null
+++ b/unicorn_mode/samples/simple/sample_inputs/sample3.bin
@@ -0,0 +1 @@
+

\ No newline at end of file
diff --git a/unicorn_mode/samples/simple/sample_inputs/sample4.bin b/unicorn_mode/samples/simple/sample_inputs/sample4.bin
new file mode 100644
index 00000000..71bd63e6
--- /dev/null
+++ b/unicorn_mode/samples/simple/sample_inputs/sample4.bin
@@ -0,0 +1 @@
+

\ No newline at end of file
diff --git a/unicorn_mode/samples/simple/sample_inputs/sample5.bin b/unicorn_mode/samples/simple/sample_inputs/sample5.bin
new file mode 100644
index 00000000..aed2973e
--- /dev/null
+++ b/unicorn_mode/samples/simple/sample_inputs/sample5.bin
@@ -0,0 +1 @@
+

\ No newline at end of file
diff --git a/unicorn_mode/samples/simple/simple_target.bin b/unicorn_mode/samples/simple/simple_target.bin
new file mode 100644
index 00000000..0095eb6c
--- /dev/null
+++ b/unicorn_mode/samples/simple/simple_target.bin
diff --git a/unicorn_mode/samples/simple/simple_target.c b/unicorn_mode/samples/simple/simple_target.c
new file mode 100644
index 00000000..589d136c
--- /dev/null
+++ b/unicorn_mode/samples/simple/simple_target.c
@@ -0,0 +1,37 @@
+/*
+ * Sample target file to test afl-unicorn fuzzing capabilities.
+ * This is a very trivial example that will crash pretty easily
+ * in several different exciting ways. 
+ *
+ * Input is assumed to come from a buffer located at DATA_ADDRESS 
+ * (0x00300000), so make sure that your Unicorn emulation of this 
+ * puts user data there.
+ *
+ * Written by Nathan Voss <njvoss99@gmail.com>
+ */
+
+// Magic address where mutated data will be placed
+#define DATA_ADDRESS 	0x00300000	
+
+int main(void)
+{
+	unsigned char* data_buf = (unsigned char*)DATA_ADDRESS;	
+
+	if(data_buf[20] != 0)
+	{
+		// Cause an 'invalid read' crash if data[0..3] == '\x01\x02\x03\x04'
+		unsigned char invalid_read = *(unsigned char*)0x00000000;					
+	}
+	else if(data_buf[0] > 0x10 && data_buf[0] < 0x20 && data_buf[1] > data_buf[2])
+	{
+		// Cause an 'invalid read' crash if (0x10 < data[0] < 0x20) and data[1] > data[2]
+		unsigned char invalid_read = *(unsigned char*)0x00000000;
+	}
+	else if(data_buf[9] == 0x00 && data_buf[10] != 0x00 && data_buf[11] == 0x00)
+	{
+		// Cause a crash if data[10] is not zero, but [9] and [11] are zero
+		unsigned char invalid_read = *(unsigned char*)0x00000000;
+	}
+	
+	return 0;
+}
\ No newline at end of file
diff --git a/unicorn_mode/samples/simple/simple_test_harness.py b/unicorn_mode/samples/simple/simple_test_harness.py
new file mode 100644
index 00000000..8e102a42
--- /dev/null
+++ b/unicorn_mode/samples/simple/simple_test_harness.py
@@ -0,0 +1,170 @@
+""" 
+   Simple test harness for AFL's Unicorn Mode.
+
+   This loads the simple_target.bin binary (precompiled as MIPS code) into
+   Unicorn's memory map for emulation, places the specified input into
+   simple_target's buffer (hardcoded to be at 0x300000), and executes 'main()'.
+   If any crashes occur during emulation, this script throws a matching signal
+   to tell AFL that a crash occurred.
+
+   Run under AFL as follows:
+
+   $ cd <afl_path>/unicorn_mode/samples/simple/
+   $ ../../../afl-fuzz -U -m none -i ./sample_inputs -o ./output -- python simple_test_harness.py @@ 
+"""
+
+import argparse
+import os
+import signal
+
+from unicorn import *
+from unicorn.mips_const import *
+
+# Path to the file containing the binary to emulate
+BINARY_FILE = os.path.join(os.path.dirname(os.path.abspath(__file__)), 'simple_target.bin')
+
+# Memory map for the code to be tested
+CODE_ADDRESS  = 0x00100000  # Arbitrary address where code to test will be loaded
+CODE_SIZE_MAX = 0x00010000  # Max size for the code (64kb)
+STACK_ADDRESS = 0x00200000  # Address of the stack (arbitrarily chosen)
+STACK_SIZE	  = 0x00010000  # Size of the stack (arbitrarily chosen)
+DATA_ADDRESS  = 0x00300000  # Address where mutated data will be placed
+DATA_SIZE_MAX = 0x00010000  # Maximum allowable size of mutated data
+
+try:
+    # If Capstone is installed then we'll dump disassembly, otherwise just dump the binary.
+    from capstone import *
+    cs = Cs(CS_ARCH_MIPS, CS_MODE_MIPS32 + CS_MODE_BIG_ENDIAN)
+    def unicorn_debug_instruction(uc, address, size, user_data):
+        mem = uc.mem_read(address, size)
+        for (cs_address, cs_size, cs_mnemonic, cs_opstr) in cs.disasm_lite(bytes(mem), size):
+            print("    Instr: {:#016x}:\t{}\t{}".format(address, cs_mnemonic, cs_opstr))
+except ImportError:
+    def unicorn_debug_instruction(uc, address, size, user_data):
+        print("    Instr: addr=0x{0:016x}, size=0x{1:016x}".format(address, size))    
+
+def unicorn_debug_block(uc, address, size, user_data):
+    print("Basic Block: addr=0x{0:016x}, size=0x{1:016x}".format(address, size))
+    
+def unicorn_debug_mem_access(uc, access, address, size, value, user_data):
+    if access == UC_MEM_WRITE:
+        print("        >>> Write: addr=0x{0:016x} size={1} data=0x{2:016x}".format(address, size, value))
+    else:
+        print("        >>> Read: addr=0x{0:016x} size={1}".format(address, size))    
+
+def unicorn_debug_mem_invalid_access(uc, access, address, size, value, user_data):
+    if access == UC_MEM_WRITE_UNMAPPED:
+        print("        >>> INVALID Write: addr=0x{0:016x} size={1} data=0x{2:016x}".format(address, size, value))
+    else:
+        print("        >>> INVALID Read: addr=0x{0:016x} size={1}".format(address, size))   
+
+def force_crash(uc_error):
+    # This function should be called to indicate to AFL that a crash occurred during emulation.
+    # Pass in the exception received from Uc.emu_start()
+    mem_errors = [
+        UC_ERR_READ_UNMAPPED, UC_ERR_READ_PROT, UC_ERR_READ_UNALIGNED,
+        UC_ERR_WRITE_UNMAPPED, UC_ERR_WRITE_PROT, UC_ERR_WRITE_UNALIGNED,
+        UC_ERR_FETCH_UNMAPPED, UC_ERR_FETCH_PROT, UC_ERR_FETCH_UNALIGNED,
+    ]
+    if uc_error.errno in mem_errors:
+        # Memory error - throw SIGSEGV
+        os.kill(os.getpid(), signal.SIGSEGV)
+    elif uc_error.errno == UC_ERR_INSN_INVALID:
+        # Invalid instruction - throw SIGILL
+        os.kill(os.getpid(), signal.SIGILL)
+    else:
+        # Not sure what happened - throw SIGABRT
+        os.kill(os.getpid(), signal.SIGABRT)
+
+def main():
+
+    parser = argparse.ArgumentParser(description="Test harness for simple_target.bin")
+    parser.add_argument('input_file', type=str, help="Path to the file containing the mutated input to load")
+    parser.add_argument('-d', '--debug', default=False, action="store_true", help="Enables debug tracing")
+    args = parser.parse_args()
+
+    # Instantiate a MIPS32 big endian Unicorn Engine instance
+    uc = Uc(UC_ARCH_MIPS, UC_MODE_MIPS32 + UC_MODE_BIG_ENDIAN)
+
+    if args.debug:
+        uc.hook_add(UC_HOOK_BLOCK, unicorn_debug_block)
+        uc.hook_add(UC_HOOK_CODE, unicorn_debug_instruction)
+        uc.hook_add(UC_HOOK_MEM_WRITE | UC_HOOK_MEM_READ, unicorn_debug_mem_access)
+        uc.hook_add(UC_HOOK_MEM_WRITE_UNMAPPED | UC_HOOK_MEM_READ_INVALID, unicorn_debug_mem_invalid_access)
+
+    #---------------------------------------------------
+    # Load the binary to emulate and map it into memory
+
+    print("Loading data input from {}".format(args.input_file))
+    binary_file = open(BINARY_FILE, 'rb')
+    binary_code = binary_file.read()
+    binary_file.close()
+
+    # Apply constraints to the mutated input
+    if len(binary_code) > CODE_SIZE_MAX:
+        print("Binary code is too large (> {} bytes)".format(CODE_SIZE_MAX))
+        return
+
+    # Write the mutated command into the data buffer
+    uc.mem_map(CODE_ADDRESS, CODE_SIZE_MAX)
+    uc.mem_write(CODE_ADDRESS, binary_code)
+
+    # Set the program counter to the start of the code
+    start_address = CODE_ADDRESS          # Address of entry point of main()
+    end_address   = CODE_ADDRESS + 0xf4   # Address of last instruction in main()
+    uc.reg_write(UC_MIPS_REG_PC, start_address)
+
+    #-----------------
+    # Setup the stack
+
+    uc.mem_map(STACK_ADDRESS, STACK_SIZE)
+    uc.reg_write(UC_MIPS_REG_SP, STACK_ADDRESS + STACK_SIZE)
+
+    #-----------------------------------------------------
+    # Emulate 1 instruction to kick off AFL's fork server
+    #   THIS MUST BE DONE BEFORE LOADING USER DATA! 
+    #   If this isn't done every single run, the AFL fork server 
+    #   will not be started appropriately and you'll get erratic results!
+    #   It doesn't matter what this returns with, it just has to execute at
+    #   least one instruction in order to get the fork server started.
+
+    # Execute 1 instruction just to startup the forkserver
+    print("Starting the AFL forkserver by executing 1 instruction")
+    try:
+        uc.emu_start(uc.reg_read(UC_MIPS_REG_PC), 0, 0, count=1)
+    except UcError as e:
+        print("ERROR: Failed to execute a single instruction (error: {})!".format(e))
+        return
+
+    #-----------------------------------------------
+    # Load the mutated input and map it into memory
+
+    # Load the mutated input from disk
+    print("Loading data input from {}".format(args.input_file))
+    input_file = open(args.input_file, 'rb')
+    input = input_file.read()
+    input_file.close()
+
+    # Apply constraints to the mutated input
+    if len(input) > DATA_SIZE_MAX:
+        print("Test input is too long (> {} bytes)".format(DATA_SIZE_MAX))
+        return
+
+    # Write the mutated command into the data buffer
+    uc.mem_map(DATA_ADDRESS, DATA_SIZE_MAX)
+    uc.mem_write(DATA_ADDRESS, input)
+
+    #------------------------------------------------------------
+    # Emulate the code, allowing it to process the mutated input
+
+    print("Executing until a crash or execution reaches 0x{0:016x}".format(end_address))
+    try:
+        result = uc.emu_start(uc.reg_read(UC_MIPS_REG_PC), end_address, timeout=0, count=0)
+    except UcError as e:
+        print("Execution failed with error: {}".format(e))
+        force_crash(e)
+
+    print("Done.")
+
+if __name__ == "__main__":
+    main()
\ No newline at end of file