[PATCH v2] perf symbol: Add LoongArch case in get_plt_sizes()

* [PATCH v2] perf symbol: Add LoongArch case in get_plt_sizes()
@ 2023-05-23  9:57 Tiezhu Yang
  2023-05-23 10:26 ` Huacai Chen
  0 siblings, 1 reply; 6+ messages in thread
From: Tiezhu Yang @ 2023-05-23  9:57 UTC (permalink / raw)
  To: Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo,
	Mark Rutland, Alexander Shishkin, Jiri Olsa, Namhyung Kim,
	Ian Rogers, Adrian Hunter
  Cc: Leo Yan, linux-perf-users, linux-kernel, loongarch, loongson-kernel

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@loongson.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


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