Author: pcc
Date: Tue May 24 18:38:02 2016
New Revision: 270634
URL: http://llvm.org/viewvc/llvm-project?rev=270634&view=rev
Log:
docs: Document how safestack handles setjmp and exceptions.
Modified:
cfe/trunk/docs/SafeStack.rst
Modified: cfe/trunk/docs/SafeStack.rst
URL:
http://llvm.org/viewvc/llvm-project/cfe/trunk/docs/SafeStack.rst?rev=270634&r1=270633&r2=270634&view=diff
==============================================================================
--- cfe/trunk/docs/SafeStack.rst (original)
+++ cfe/trunk/docs/SafeStack.rst Tue May 24 18:38:02 2016
@@ -178,6 +178,17 @@ Please refer to the `Code-Pointer Integr
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
------------
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