From: compudj@krystal.dyndns.org (Mathieu Desnoyers)
Subject: [ltt-dev] syscall id limited to 16 bits
Date: Mon, 24 Aug 2009 10:35:08 -0400 [thread overview]
Message-ID: <20090824143508.GC21110@Krystal> (raw)
In-Reply-To: <4A855344.106@parrot.com>
* Matthieu CASTET (matthieu.castet at parrot.com) wrote:
> Hi,
>
> in the ltt patch used for 2.6.27, syscall trace only report the syscall
> id on 16 bits [1].
>
> This is wrong. For example on arm, there are private arch syscall in the
> range 0xf0000-0xfffff (for example set_tls).
> For this syscall the kernel.syscall_entry trace get the id truncated.
>
Patches would be welcome ;)
Mathieu
>
> Matthieu
>
>
> [1] look at the (unsigned short) cast on id
> +notrace void probe_syscall_entry(struct pt_regs *regs, long id)
> +{
> + struct marker *marker;
> + struct serialize_long_short data;
> +
> + data.f1 = instruction_pointer(regs);
> + data.f2 = (unsigned short)id;
> +
> + marker = &GET_MARKER(kernel, syscall_entry);
> + ltt_specialized_trace(marker, marker->single.probe_private,
> + &data, serialize_sizeof(data), sizeof(long));
> +}
>
>
> _______________________________________________
> ltt-dev mailing list
> ltt-dev at lists.casi.polymtl.ca
> http://lists.casi.polymtl.ca/cgi-bin/mailman/listinfo/ltt-dev
>
--
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
prev parent reply other threads:[~2009-08-24 14:35 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-14 12:06 Matthieu CASTET
2009-08-24 14:35 ` Mathieu Desnoyers [this message]
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