tree 27ca9980934d61f9aa35a23f1825d3f413fb0f41
parent ebe850e01cf227dbf67e90c307c667819bcf2f19
author Elliott Hughes <enh@google.com> 1668111991 +0000
committer Elliott Hughes <enh@google.com> 1668116103 +0000

Simplify the malloc_debug unwind.

It's hard to find the start of the previous instruction for riscv64
(given the C extension), and discussion with the ART folks cast doubt
on the comment's claim that we do this correctly for arm32 anyway.

So, rather than add complexity for riscv64, let's simplify this routine
for everyone. I suspect we could probably get away with just `--ip` for
all architectures, but since it's trivial to at least maintain plausible
alignment, I've stuck with the correct "at least" byte counts instead.

(See the discussion on
https://lists.riscv.org/g/sig-android/topic/detecting_16_bit_vs_32_bit/94813787
for more about riscv64 specifically.)

Test: treehugger
Change-Id: Ie43451d329470b3ece8779d11eb705d24d01c3d7