netdev - Re: [PATCH 4/4] samples/bpf: Fix tracex5 to work with MIPS syscalls.

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Date:   Wed, 14 Jun 2017 02:21:36 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     David Daney <david.daney@...ium.com>,
        Alexei Starovoitov <ast@...nel.org>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
CC:     linux-mips@...ux-mips.org, ralf@...ux-mips.org
Subject: Re: [PATCH 4/4] samples/bpf: Fix tracex5 to work with MIPS syscalls.

On 06/14/2017 01:49 AM, David Daney wrote:
> There are two problems:
>
> 1) In MIPS the __NR_* macros expand to an expression, this causes the
>     sections of the object file to be named like:
>
>    .
>    .
>    .
>    [ 5] kprobe/(5000 + 1) PROGBITS        0000000000000000 000160 ...
>    [ 6] kprobe/(5000 + 0) PROGBITS        0000000000000000 000258 ...
>    [ 7] kprobe/(5000 + 9) PROGBITS        0000000000000000 000348 ...
>    .
>    .
>    .
>
> The fix here is to use the "asm_offsets" trick to evaluate the macros
> in the C compiler and generate a header file with a usable form of the
> macros.
>
> 2) MIPS syscall numbers start at 5000, so we need a bigger map to hold
> the sub-programs.
>
> Signed-off-by: David Daney <david.daney@...ium.com>

Acked-by: Daniel Borkmann <daniel@...earbox.net>