[Lldb-commits] [PATCH] D16853: Use BKPT instead of UDF for arm/thumb breakpoints

Tamas Berghammer via lldb-commits lldb-commits at lists.llvm.org
Tue Feb 16 03:30:33 PST 2016

Hi Ewan,

Can you give me some instruction about how can I reproduce the issue on a
Nexus 6? (If you can't gave the information out then the disassembly of the
offending function and the fault address might gave me some hint as well)

A SIGBUS error looks a bit strange for me but my best guess is that we
manage to install a 2 byte thumb breakpoint on the 2nd 2 byte of a 4 byte
instruction what results in an incorrect instruction opcode and from that
point strange things can happen.


On Tue, Feb 16, 2016 at 10:39 AM Ewan Crawford <ewan at codeplay.com> wrote:

> EwanCrawford added a subscriber: EwanCrawford.
> EwanCrawford added a comment.
> Hi Tamas,
> This commit causes a SIGBUS for me on Nexus 6 ARMv7 devices, specifically
> the g_thumb_breakpoint_opcode change.
> I can revert this locally but any advice on tracking the issue down
> further?
> Repository:
>   rL LLVM
> http://reviews.llvm.org/D16853
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