Re: Improving SystemTap ARM Architecture Support

[Mark Wielaard <mjw at redhat dot com>]

On Tue, 2011-07-19 at 17:48 -0400, William Cohen wrote:
> Reviewing early test results and the code the following is an
> incomplete list of improvements:
> 
> -created aux_syscalls.stp (FIXED)
>   "make installcheck" uses debuginfo smoke test
>   needs _arch_ptrace_argstr(), aux_syscalls.stp
> -map arm variants (armv7l and armv5tel) to arm (PR4186)
> -provide tapset/arm/registers.stp
>   -map register name to/from sruct
>   -functions for nd probe argument access
> -add any arm specific syscalls in tapset/arm/syscalls.stp
> -provide high-resolution timer for gettimeofday_ns()
>   -this may be complicated by the variety of arm high-res timer mechanisms

For sdt probes one also needs a fixed binutils with the following fix in
it: http://sourceware.org/ml/binutils/2011-07/msg00118.html
Fedora already has source packages, but I don't know if they have been
build for arm yet:
http://koji.fedoraproject.org/koji/buildinfo?buildID=253553

For user space probing one needs some general kernel cleanups, utrace
and uprobes fixes as described in this thread:
https://www.redhat.com/archives/utrace-devel/2011-April/msg00005.html

Cheers,

Mark