linux-kernel - Re: [PATCH 31/48] perf dwarf-aux: Add die_get

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Date:   Tue, 7 Nov 2023 21:28:19 -0800
From:   Namhyung Kim <namhyung@...nel.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-perf-users@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Stephane Eranian <eranian@...gle.com>,
        linux-toolchains@...r.kernel.org, linux-trace-devel@...r.kernel.org
Subject: Re: [PATCH 31/48] perf dwarf-aux: Add die_get_cfa()

On Mon, Nov 6, 2023 at 4:50 PM Masami Hiramatsu <mhiramat@...nel.org> wrote:
>
> On Wed, 11 Oct 2023 20:50:54 -0700
> Namhyung Kim <namhyung@...nel.org> wrote:
>
> > The die_get_cfa() is to get frame base register and offset at the given
> > instruction address (pc).  This info will be used to locate stack
> > variables which have location expression using DW_OP_fbreg.
> >
>
> In the util/probe-finder.c, I added the elfutils version checker
>
> #if _ELFUTILS_PREREQ(0, 142)
>
> for CFI related code, in commit 7752f1b096e1 ("perf probe: Don't
>  compile CFI related code if elfutils is old"). Maybe we'd better to have
> a config of HAVE_DWARF_CFI_SUPPORT for this.

Sounds like a good idea.  Will add.

Thanks,
Namhyung