tree e0fdc1e8cb6d728ad94dd5ca1a4e4161633d3999
parent 3464bc4b439e01244c0a6b5f35e8e949e0f16096
author Christopher Ferris <cferris@google.com> 1526607458 -0700
committer Christopher Ferris <cferris@google.com> 1526608722 -0700

Fix bug when doing signal handler lookup.

The new lld linker uses all non-zero offset executable maps. There was
a bug when trying to find if the stack is in a signal handler that caused
the code to read the wrong place in the elf. Fixed by not adding the elf
offset to the relative pc.

Also fixed the unwind_for_offline tool to dump multiple stacks if necessary.

Added new offline unit test that would have failed with the old code.

Bug: 79936827

Test: Ran unit tests and libbacktrace unit tests.
Test: Dumped backtraces of system pids.
Test: Ran 137-cfi art test.
Change-Id: Iaca8c18c2a314902e64c3f72831234297e8dcb1b