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Re: [Libunwind-devel] testing libunwind for aarch64 bigendian system

From: Willeke, Jan (Hays)
Subject: Re: [Libunwind-devel] testing libunwind for aarch64 bigendian system
Date: Tue, 15 Dec 2015 11:13:09 +0000

Hi Yvan,
I run into this old aarch64 ptrace libunwind problem.
The patch you are talking about how far is it, can you post it?

regards Jan

> Hi,
>>> FAIL: run-ptrace-mapper
>>> FAIL: run-ptrace-misc
>>> crasher[3083]: unhandled level 2 translation fault (11) at 0x00000020,
>>> FAIL: run-coredump-unwind-mdi
>> These look like kernel issues related to the ptrace system call. You
>> may want to report them to LKML with a minimal test program.
> These failures are present in the AArch64 little endian as well.
> After giving a closer look at the issue, it doesn't look at a kernel
> issue, but at how ptrace is invoked the gather registers: it uses
> PTRACE_PEEKUSER whereas it not supported on AArch64 where the
> PTRACE_GETREGSET ptrace request should be used.  I'm testing a patch
> for that, it doesn't work so far, but we can now access the registers
> and then an error occurs because no unwind information are found when
> we're in _start.
> Yvan

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