linux-kernel - Re: [PATCH V2 0/9] perf symbols: Improve dso__synthesize_plt

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Date:   Tue, 31 Jan 2023 22:59:58 -0800
From:   Namhyung Kim <namhyung@...nel.org>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>, Ian Rogers <irogers@...gle.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH V2 0/9] perf symbols: Improve dso__synthesize_plt_symbols()
 for x86

Hi Adrian,

On Tue, Jan 31, 2023 at 5:16 AM Adrian Hunter <adrian.hunter@...el.com> wrote:
>
> Hi
>
> This is version 2 of the second of 2 patchsets to improve
> dso__synthesize_plt_symbols().
> This patchset focuses on getting rid of unknown symbols that show up in
> Intel PT traces.
>
> x86 has 2 more plt's, namely .plt.sec and .plt.got, so support is added for
> synthesizing symbols for them.  Special handing is needed for IFUNC symbols,
> and it is also possible to have a .plt for static executables, so support is
> added for that.
>
>
> Changes in V2:
>
>     perf symbols: Add support for x86 .plt.sec
>         Amend commit message and example about -z plt
>
>     perf symbols: Get symbols for .plt.got for x86-64
>         Fix get_plt_got_name() not to segfault with EM_386
>
>
> Adrian Hunter (9):
>       perf symbols: Correct plt entry sizes for x86
>       perf symbols: Add support for x86 .plt.sec
>       perf symbols: Sort plt relocations for x86
>       perf symbols: Record whether a symbol is an alias for an IFUNC symbol
>       perf symbols: Add support for IFUNC symbols for x86_64
>       perf symbols: Allow for .plt without header
>       perf symbols: Allow for static executables with .plt
>       perf symbols: Start adding support for .plt.got for x86
>       perf symbols: Get symbols for .plt.got for x86-64

Reviewed-by: Namhyung Kim <namhyung@...nel.org>

Thanks,
Namhyung


>
>  tools/perf/util/symbol-elf.c | 365 ++++++++++++++++++++++++++++++++++++++++---
>  tools/perf/util/symbol.c     |   4 +
>  tools/perf/util/symbol.h     |   2 +
>  tools/perf/util/symsrc.h     |   1 +
>  4 files changed, 350 insertions(+), 22 deletions(-)
>
>
> Regards
> Adrian