linux-kernel - Re: [PATCH] perf symbol: Add LoongArch case in get_plt

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Message-ID: <CAAhV-H7waE0gmSU09YKJMHDAnj7BV7ukiLqWs+JzzLrHDG5z8w@mail.gmail.com>
Date:   Thu, 18 May 2023 10:11:27 +0800
From:   Huacai Chen <chenhuacai@...nel.org>
To:     Tiezhu Yang <yangtiezhu@...ngson.cn>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-perf-users@...r.kernel.org, loongarch@...ts.linux.dev,
        linux-kernel@...r.kernel.org, loongson-kernel@...ts.loongnix.cn
Subject: Re: [PATCH] perf symbol: Add LoongArch case in get_plt_sizes()

Queued, thanks.

Huacai

On Tue, May 9, 2023 at 2:56 PM Tiezhu Yang <yangtiezhu@...ngson.cn> wrote:
>
> We can see the following definitions in bfd/elfnn-loongarch.c:
>
>   #define PLT_HEADER_INSNS 8
>   #define PLT_HEADER_SIZE (PLT_HEADER_INSNS * 4)
>
>   #define PLT_ENTRY_INSNS 4
>   #define PLT_ENTRY_SIZE (PLT_ENTRY_INSNS * 4)
>
> so plt header size is 32 and plt entry size is 16 on LoongArch,
> let us add LoongArch case in get_plt_sizes().
>
> Link: https://sourceware.org/git/?p=binutils-gdb.git;a=blob;f=bfd/elfnn-loongarch.c
> Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
> ---
>
> This is based on 6.4-rc1
>
>  tools/perf/util/symbol-elf.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
> index b2ed9cc..5d409c2 100644
> --- a/tools/perf/util/symbol-elf.c
> +++ b/tools/perf/util/symbol-elf.c
> @@ -411,6 +411,10 @@ static bool get_plt_sizes(struct dso *dso, GElf_Ehdr *ehdr, GElf_Shdr *shdr_plt,
>                 *plt_header_size = 32;
>                 *plt_entry_size = 16;
>                 return true;
> +       case EM_LOONGARCH:
> +               *plt_header_size = 32;
> +               *plt_entry_size = 16;
> +               return true;
>         case EM_SPARC:
>                 *plt_header_size = 48;
>                 *plt_entry_size = 12;
> --
> 2.1.0
>
>