linux-kernel - Re: [PATCH 09/13] libbpf: Add bpf_insn_

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Message-ID: <20180312155323.GF23111@krava>
Date:   Mon, 12 Mar 2018 16:53:23 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...nel.org>, lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 09/13] libbpf: Add bpf_insn__interpret function

On Mon, Mar 12, 2018 at 12:44:03PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Mon, Mar 12, 2018 at 10:43:09AM +0100, Jiri Olsa escreveu:
> > Adding bpf_insn__interpret function to run ebpf program
> > in user space.
> > 
> > It's 'borrowed' from systemtap code, I still need to figure
> > the proper credits, that will go to the file header in case
> > this would ever go in.
> 
> What is the license? GPL?

yes GPLv2

>  
> > Link: http://lkml.kernel.org/n/tip-qqxsyw6imdisj3dydd6e21y7@git.kernel.org
> > Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> > 
> > +++ b/tools/lib/bpf/Build
> > @@ -1 +1 @@
> > -libbpf-y := libbpf.o bpf.o nlattr.o
> > +libbpf-y := libbpf.o bpf.o nlattr.o interp.o
> > diff --git a/tools/lib/bpf/interp.c b/tools/lib/bpf/interp.c
> > new file mode 100644
> > index 000000000000..2ceb6a0836c3
> > --- /dev/null
> > +++ b/tools/lib/bpf/interp.c
> > @@ -0,0 +1,245 @@
> > +#include <uapi/linux/bpf.h>
> > +#include <stdlib.h>
> > +#include "interp.h"
> > +
> > +u64 bpf_interp__run(struct bpf_interp *interp)
> > +{
> <SNIP>
> > +
> > +		case BPF_JMP | BPF_EXIT:
> > +			return regs[0];
> > +
> > +		default:
> > +			abort();
> 
> And this should be converted to returning some error that the users can
> tell the user using whatever UI (TUI, etc).

right, I want to get rid of all abort calls, I think there's one more

jirka