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From "Ilya Berezhniuk (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-5618) [drlvm][port][signals] Fix for native stack unwinding
Date Wed, 19 Mar 2008 13:04:24 GMT
[drlvm][port][signals] Fix for native stack unwinding
-----------------------------------------------------

                 Key: HARMONY-5618
                 URL: https://issues.apache.org/jira/browse/HARMONY-5618
             Project: Harmony
          Issue Type: Bug
          Components: DRLVM
            Reporter: Ilya Berezhniuk
            Priority: Minor
         Attachments: H-5618.patch

There were problems with native stack unwinding using EBP/RBP frame pointer - sometimes it
points to incorrect return address.
Therefore I've disabled EBP/RBP unwinding in the new crash handler implementation committed
recently.

Unfortunately, it appeared that unwinding with only 2nd heuristic approach (return addresses
lookup in the stack) works not good also.
This problems do not appear only on Windows/debug where local stack is erased in debug prolog
and does not contain return addresses from previous call branches.

I experimented a bit, and found a way to solve this problem.
Suggested patch re-enables EBP/RBP unwinding with additional validation to filter out wrong
EBP/RBP values which do not correspond to the current frame.

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