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instrumentation/README.neverzero.md
-# NeverZero counters for LLVM instrumentation
-
-## Usage
-
-In larger, complex or reiterative programs the byte sized counters that collect
-the edge coverage can easily fill up and wrap around.
-This is not that much of an issue - unless by chance it wraps just to a value
-of zero when the program execution ends.
-In this case afl-fuzz is not able to see that the edge has been accessed and
-will ignore it.
-
-NeverZero prevents this behaviour. If a counter wraps, it jumps over the value
-0 directly to a 1. This improves path discovery (by a very little amount)
-at a very little cost (one instruction per edge).
-
-(The alternative of saturated counters has been tested also and proved to be
-inferior in terms of path discovery.)
-
-This is implemented in afl-gcc and afl-gcc-fast, however for llvm_mode this is
-optional if multithread safe counters are selected or the llvm version is below
-9 - as there are severe performance costs in these cases.
-
-If you want to enable this for llvm versions below 9 or thread safe counters
-then set
-
-```
-export AFL_LLVM_NOT_ZERO=1
-```
-
-In case you are on llvm 9 or greater and you do not want this behaviour then
-you can set:
-```
-AFL_LLVM_SKIP_NEVERZERO=1
-```
-If the target does not have extensive loops or functions that are called
-a lot then this can give a small performance boost.
-
-Please note that the default counter implementations are not thread safe!
-
-Support for thread safe counters in mode LLVM CLASSIC can be activated with setting
-`AFL_LLVM_THREADSAFE_INST=1`.
\ No newline at end of file

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instrumentation/README.out_of_line.md
-## Using AFL++ without inlined instrumentation
-
- This file describes how you can disable inlining of instrumentation.
-
-
-By default, the GCC plugin will duplicate the effects of calling
-`__afl_trace` (see `afl-gcc-rt.o.c`) in instrumented code, instead of
-issuing function calls.
-
-The calls are presumed to be slower, more so because the rt file
-itself is not optimized by the compiler.
-
-Setting `AFL_GCC_OUT_OF_LINE=1` in the environment while compiling code
-with the plugin will disable this inlining, issuing calls to the
-unoptimized runtime instead.
-
-You probably don't want to do this, but it might be useful in certain
-AFL debugging scenarios, and it might work as a fallback in case
-something goes wrong with the inlined instrumentation.

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instrumentation/README.snapshot.md
-# AFL++ snapshot feature
-
-**NOTE:** the snapshot lkm is currently not supported and needs a maintainer :-)
-
-Snapshotting is a feature that makes a snapshot from a process and then
-restores its state, which is faster then forking it again.
-
-All targets compiled with llvm_mode are automatically enabled for the
-snapshot feature.
-
-To use the snapshot feature for fuzzing compile and load this kernel
-module: [https://github.com/AFLplusplus/AFL-Snapshot-LKM](https://github.com/AFLplusplus/AFL-Snapshot-LKM)
-
-Note that is has little value for persistent (__AFL_LOOP) fuzzing.
-
-## Notes
-
-Snapshot does not work with multithreaded targets yet. Still in WIP, it is now usable only for single threaded applications.

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