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From: "dsmith at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug runtime/22671] MIPSEL error Unknown register: a4
Date: Fri, 05 Jan 2018 14:25:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D22671

David Smith <dsmith at redhat dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |dsmith at redhat dot com

--- Comment #1 from David Smith <dsmith at redhat dot com> ---
(In reply to Gustavo Moreira from comment #0)
> Created attachment 10711 [details]
> kernel config
>=20
> Having this error on mipsel emulation:=20
> ...
> stapio:stp_main_loop:861 systemtap_module_init() returned 0
> ERROR: Unknown register: a4

It looks like this is coming from tapset/mips/registers.stp. It appears that
that file has only been tested against 64-bit kernels. It doesn't think the
a4-a7 registers exist in a 32-bit kernel. That prevents it from grabbing the
5th through 8th argument to a function (in _stp_arg()).

If you know the calling convention for a 32-bit mips kernel, we can fix that
file.

--=20
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