================
@@ -0,0 +1,265 @@
+Pointer Authentication
+======================
+
+.. contents::
+   :local:
+
+Introduction
+------------
+
+Pointer authentication is a technology which offers strong probabilistic 
protection against exploiting a broad class of memory bugs to take control of 
program execution.  When adopted consistently in a language ABI, it provides a 
form of relatively fine-grained control flow integrity (CFI) check that resists 
both return-oriented programming (ROP) and jump-oriented programming (JOP) 
attacks.
+
+While pointer authentication can be implemented purely in software, direct 
hardware support (e.g. as provided by ARMv8.3 PAuth) can dramatically lower the 
execution speed and code size costs.  Similarly, while pointer authentication 
can be implemented on any architecture, taking advantage of the (typically) 
excess addressing range of a target with 64-bit pointers minimizes the impact 
on memory performance and can allow interoperation with existing code (by 
disabling pointer authentication dynamically).  This document will generally 
attempt to present the pointer authentication feature independent of any 
hardware implementation or ABI.  Considerations that are 
implementation-specific are clearly identified throughout.
----------------
atrosinenko wrote:

It may be more readable to avoid "can dramatically lower the execution speed" 
substring when mentioning "lowering execution speed and size costs" :)

https://github.com/llvm/llvm-project/pull/65996
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