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49 lines
1.6 KiB
C
49 lines
1.6 KiB
C
/*
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american fuzzy lop++ - unicorn instrumentation
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----------------------------------------------
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Originally written by Andrew Griffiths <agriffiths@google.com> and
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Michal Zalewski <lcamtuf@google.com>
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Adapted for afl-unicorn by Dominik Maier <mail@dmnk.co>
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CompareCoverage and NeverZero counters by Andrea Fioraldi
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<andreafioraldi@gmail.com>
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Copyright 2015, 2016, 2017 Google Inc. All rights reserved.
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Copyright 2019 AFLplusplus Project. All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at:
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http://www.apache.org/licenses/LICENSE-2.0
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This code is a shim patched into the separately-distributed source
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code of Unicorn 1.0.1. It leverages the built-in QEMU tracing functionality
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to implement AFL-style instrumentation and to take care of the remaining
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parts of the AFL fork server logic.
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The resulting libunicorn binary is essentially a standalone instrumentation
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tool; for an example of how to leverage it for other purposes, you can
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have a look at afl-showmap.c.
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*/
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#include "../../config.h"
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/* NeverZero */
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#if (defined(__x86_64__) || defined(__i386__)) && defined(AFL_QEMU_NOT_ZERO)
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#define INC_AFL_AREA(loc) \
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asm volatile( \
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"incb (%0, %1, 1)\n" \
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"adcb $0, (%0, %1, 1)\n" \
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: /* no out */ \
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: "r"(afl_area_ptr), "r"(loc) \
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: "memory", "eax")
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#else
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#define INC_AFL_AREA(loc) afl_area_ptr[loc]++
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#endif
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