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

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Date:   Tue, 23 May 2023 17:57:53 +0800
From:   Tiezhu Yang <yangtiezhu@...ngson.cn>
To:     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>
Cc:     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: [PATCH v2] perf symbol: Add LoongArch case in get_plt_sizes()

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