linux-kernel - Re: [PATCH] tools: bpf_jit_disasm: Add option to dump JIT image to a file.

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Date:   Tue, 11 Apr 2017 23:54:19 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     David Daney <david.daney@...ium.com>,
        Alexei Starovoitov <ast@...nel.org>, netdev@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>
CC:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tools: bpf_jit_disasm: Add option to dump JIT image to
 a file.

On 04/11/2017 11:30 PM, David Daney wrote:
> When debugging the JIT on an embedded platform or cross build
> environment, libbfd may not be available, making it impossible to run
> bpf_jit_disasm natively.
>
> Add an option to emit a binary image of the JIT code to a file.  This
> file can then be disassembled off line.  Typical usage in this case
> might be (pasting mips64 dmesg output to cat command):
>
>     $ cat > jit.raw
>     $ bpf_jit_disasm -f jit.raw -O jit.bin
>     $ mips64-linux-gnu-objdump -D -b binary -m mips:isa64r2 -EB jit.bin
>
> Signed-off-by: David Daney <david.daney@...ium.com>

Seems good, we could at some point also add an -I jit.bin option
if needed for offline analysis/comparison instead of using -f
plain text.

Thanks!

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