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docs: Document how safestack handles setjmp and exceptions. 

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@270634 91177308-0d34-0410-b5e6-96231b3b80d8
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Peter Collingbourne 2016-05-24 23:38:02 +00:00
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@ -178,6 +178,17 @@ Please refer to the `Code-Pointer Integrity <http://dslab.epfl.ch/proj/cpi/>`__
project page for more information about the design of the SafeStack and its
related technologies.
setjmp and exception handling
-----------------------------
The `OSDI'14 paper <http://dslab.epfl.ch/pubs/cpi.pdf>`_ mentions that
on Linux the instrumentation pass finds calls to setjmp or functions that
may throw an exception, and inserts required instrumentation at their call
sites. Specifically, the instrumentation pass saves the shadow stack pointer
on the safe stack before the call site, and restores it either after the
call to setjmp or after an exception has been caught. This is implemented
in the function ``SafeStack::createStackRestorePoints``.
Publications
------------