linux-kernel - Re: [PATCH 04/14] perf map: Add map__objdump

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Message-ID: <CAP-5=fU=P-ib+n+OfqJAbm8gS2RY-W-KcBskoSHkC+aCmXYcXQ@mail.gmail.com>
Date: Fri, 2 Feb 2024 17:41:55 -0800
From: Ian Rogers <irogers@...gle.com>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>, Jiri Olsa <jolsa@...nel.org>, 
	Adrian Hunter <adrian.hunter@...el.com>, Peter Zijlstra <peterz@...radead.org>, 
	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>, 
	Masami Hiramatsu <mhiramat@...nel.org>, linux-toolchains@...r.kernel.org, 
	linux-trace-devel@...r.kernel.org
Subject: Re: [PATCH 04/14] perf map: Add map__objdump_2rip()

On Fri, Feb 2, 2024 at 2:05 PM Namhyung Kim <namhyung@...nel.org> wrote:
>
> Sometimes we want to convert an address in objdump output to
> map-relative address to match with a sample data.  Let's add
> map__objdump_2rip() for that.

Hi Namhyung,

I think the naming can be better here. Aren't the objdump addresses
DSO relative offsets? Is the relative IP relative to the map or the
DSO?

Thanks,
Ian

> Cc: Adrian Hunter <adrian.hunter@...el.com>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/util/map.c | 20 ++++++++++++++++++++
>  tools/perf/util/map.h |  3 +++
>  2 files changed, 23 insertions(+)
>
> diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
> index 54c67cb7ecef..66542864b7b5 100644
> --- a/tools/perf/util/map.c
> +++ b/tools/perf/util/map.c
> @@ -594,6 +594,26 @@ u64 map__objdump_2mem(struct map *map, u64 ip)
>         return ip + map__reloc(map);
>  }
>
> +u64 map__objdump_2rip(struct map *map, u64 ip)
> +{
> +       const struct dso *dso = map__dso(map);
> +
> +       if (!dso->adjust_symbols)
> +               return ip;
> +
> +       if (dso->rel)
> +               return ip + map__pgoff(map);
> +
> +       /*
> +        * kernel modules also have DSO_TYPE_USER in dso->kernel,
> +        * but all kernel modules are ET_REL, so won't get here.
> +        */
> +       if (dso->kernel == DSO_SPACE__USER)
> +               return ip - dso->text_offset;
> +
> +       return map__map_ip(map, ip + map__reloc(map));
> +}
> +
>  bool map__contains_symbol(const struct map *map, const struct symbol *sym)
>  {
>         u64 ip = map__unmap_ip(map, sym->start);
> diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
> index 49756716cb13..65e2609fa1b1 100644
> --- a/tools/perf/util/map.h
> +++ b/tools/perf/util/map.h
> @@ -132,6 +132,9 @@ u64 map__rip_2objdump(struct map *map, u64 rip);
>  /* objdump address -> memory address */
>  u64 map__objdump_2mem(struct map *map, u64 ip);
>
> +/* objdump address -> rip */
> +u64 map__objdump_2rip(struct map *map, u64 ip);
> +
>  struct symbol;
>  struct thread;
>
> --
> 2.43.0.594.gd9cf4e227d-goog
>