linux-kernel - Re: [RFC PATCH 1/6] perf bpf: Add headers for generate bpf bytecode

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Date:	Tue, 05 May 2015 15:38:42 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	He Kuang <hekuang@...wei.com>, davem@...emloft.net,
	acme@...nel.org, mingo@...hat.com, a.p.zijlstra@...llo.nl,
	masami.hiramatsu.pt@...achi.com, jolsa@...nel.org
CC:	wangnan0@...wei.com, linux-kernel@...r.kernel.org, pi3orama@....com
Subject: Re: [RFC PATCH 1/6] perf bpf: Add headers for generate bpf bytecode

On 5/5/15 3:10 AM, He Kuang wrote:
> Including bpf instruction macros and register alias.
>
> Signed-off-by: He Kuang <hekuang@...wei.com>
> ---
>   tools/perf/util/bpf-loader.h | 188 +++++++++++++++++++++++++++++++++++++++++++
>   1 file changed, 188 insertions(+)
>
> diff --git a/tools/perf/util/bpf-loader.h b/tools/perf/util/bpf-loader.h
> index baa4404..840f96d 100644
> --- a/tools/perf/util/bpf-loader.h
> +++ b/tools/perf/util/bpf-loader.h
> @@ -70,4 +70,192 @@ struct bpf_obj {
>   	} elf;
>   };
>   #define obj_elf_valid(o)	((o)->elf.fd >= 0)
> +
> +/* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */
> +
> +#define BPF_ALU64_REG(OP, DST, SRC)				\
> +	((struct bpf_insn) {					\
> +		.code  = BPF_ALU64 | BPF_OP(OP) | BPF_X,	\
> +		.dst_reg = DST,					\
> +		.src_reg = SRC,					\
> +		.off   = 0,					\
> +		.imm   = 0 })

this is massive copy-paste from samples/bpf/libbpf.h
let's create a proper library out of it and place into tools/lib/bpf/

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