tree 3787cd4d2a2b2f510acd6565f1635883ea8ea8c5
parent 4e15f7d2308444677a3b5ccb9207cebacfd8ba60
author Sim Sun <sunsj1231@gmail.com> 1579067317 -0800
committer Joshua Peraza <jperaza@chromium.org> 1579625877 +0000

arm64: recover register X30(LR) when fallback to frame pointer unwinder

Stackwalk can't recover caller's register X30($LR) value by STACK CFI info.
This will lead unwinding stop immediately when fallback to frame pointer unwinder.

This PR will use try to use second last frame to recover register X30($LR) by frame pointer.
And we will give up correction if STACK CFI info doesn't agree with frame pointer info.

Bug: https://bugs.chromium.org/p/google-breakpad/issues/detail?id=808
Change-Id: I50649e3398e268b02ff297e83db21d05705c2a2d
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/1992641
Reviewed-by: Joshua Peraza <jperaza@chromium.org>