function wrapping support

[derekbruening]

From [email protected] on April 21, 2010 12:02:53

Wrapping app functions is not a simple task when both a pre and post
control point are needed. DR should provide support for this as it's a
commonly needed feature.

Dr. Memory considered 3 methods of locating the return point:

• CFG analysis at init time => place post-hook at each return instr
• at call site identify target => place post-hook at post-call-site
• inside callee obtain retaddr => place post-hook at retaddr
  Each has its own complications. See the tutorial slides for more details.

We've also discussed other methods but they're not perfect:

• adding an extra frame on app stack: not fully transparent though
• various methods of avoiding recursion by generating the 1st instr of the
  target func elsewhere or inserting in a bb that targets the 2nd instr
• calling app func natively: not ideal

We want:

• full transparency
• target func under DR
• pre and post hooks native

Original issue: http://code.google.com/p/dynamorio/issues/detail?id=296

[derekbruening]

From [email protected] on June 02, 2010 05:47:34

Issue 314 has been merged into this issue.

[derekbruening]

From [email protected] on March 29, 2011 11:52:47

This issue was closed by revision r700 .

Status: Fixed