linux-kernel - Re: [PATCH 32/52] perf dwarf-aux: Add die_find_variable_by

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Message-ID: <ZWUTOdJukt/GNp2t@kernel.org>
Date:   Mon, 27 Nov 2023 19:07:53 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     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>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-trace-devel@...r.kernel.org, linux-toolchains@...r.kernel.org
Subject: Re: [PATCH 32/52] perf dwarf-aux: Add die_find_variable_by_addr()

Em Thu, Nov 09, 2023 at 03:59:51PM -0800, Namhyung Kim escreveu:
> The die_find_variable_by_addr() is to find a variables in the given DIE
> using given (PC-relative) address.  Global variables will have a
> location expression with DW_OP_addr which has an address so can simply
> compare it with the address.
> 
>   <1><143a7>: Abbrev Number: 2 (DW_TAG_variable)
>       <143a8>   DW_AT_name        : loops_per_jiffy
>       <143ac>   DW_AT_type        : <0x1cca>
>       <143b0>   DW_AT_external    : 1
>       <143b0>   DW_AT_decl_file   : 193
>       <143b1>   DW_AT_decl_line   : 213
>       <143b2>   DW_AT_location    : 9 byte block: 3 b0 46 41 82 ff ff ff ff
>                                      (DW_OP_addr: ffffffff824146b0)
> 
> Note that the type-offset should be calculated from the base address of
> the global variable.
> 
> Acked-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>

Thanks, applied to perf-tools-next.

- Arnaldo