linux-kernel - Re: [PATCH v2] perf symbol: Add LoongArch case in get_plt

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Date:   Thu, 8 Jun 2023 15:01:19 +0800
From:   Tiezhu Yang <yangtiezhu@...ngson.cn>
To:     Huacai Chen <chenhuacai@...nel.org>
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>,
        Leo Yan <leo.yan@...aro.org>, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org, loongarch@...ts.linux.dev,
        loongson-kernel@...ts.loongnix.cn
Subject: Re: [PATCH v2] perf symbol: Add LoongArch case in get_plt_sizes()

Hi Arnaldo,

On 05/23/2023 06:26 PM, Huacai Chen wrote:
> Acked-by: Huacai Chen <chenhuacai@...ngson.cn>
>
> On Tue, May 23, 2023 at 5:57 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>
>> ---
>>
>> v2: Add EM_LOONGARCH definition to avoid build error
>>
>>  tools/perf/util/symbol-elf.c | 8 ++++++++
>>  1 file changed, 8 insertions(+)
>>
>> diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
>> index b2ed9cc..b3dbf6c 100644
>> --- a/tools/perf/util/symbol-elf.c
>> +++ b/tools/perf/util/symbol-elf.c
>> @@ -35,6 +35,10 @@
>>  #define EM_AARCH64     183  /* ARM 64 bit */
>>  #endif
>>
>> +#ifndef EM_LOONGARCH
>> +#define EM_LOONGARCH   258
>> +#endif
>> +
>>  #ifndef ELF32_ST_VISIBILITY
>>  #define ELF32_ST_VISIBILITY(o) ((o) & 0x03)
>>  #endif
>> @@ -411,6 +415,10 @@ 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

Are you OK with this change?
Could you please pick it up in your tree?

Thanks,
Tiezhu