linux-kernel - [PATCH 02/10] perf symbols: Factor out get_plt

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Date:   Fri, 20 Jan 2023 14:34:48 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...hat.com>, Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org
Subject: [PATCH 02/10] perf symbols: Factor out get_plt_sizes()

Factor out get_plt_sizes() to make the code more readable and further
changes to dso__synthesize_plt_symbols() easier to follow.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 tools/perf/util/symbol-elf.c | 54 +++++++++++++++++++-----------------
 1 file changed, 28 insertions(+), 26 deletions(-)

diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index 96767d1b3f1c..4605680a22a3 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -323,6 +323,33 @@ static char *demangle_sym(struct dso *dso, int kmodule, const char *elf_name)
 	return demangled;
 }
 
+static void get_plt_sizes(GElf_Ehdr *ehdr, GElf_Shdr *shdr_plt,
+			  u64 *plt_header_size, u64 *plt_entry_size)
+{
+	switch (ehdr->e_machine) {
+	case EM_ARM:
+		*plt_header_size = 20;
+		*plt_entry_size = 12;
+		return;
+	case EM_AARCH64:
+		*plt_header_size = 32;
+		*plt_entry_size = 16;
+		return;
+	case EM_SPARC:
+		*plt_header_size = 48;
+		*plt_entry_size = 12;
+		return;
+	case EM_SPARCV9:
+		*plt_header_size = 128;
+		*plt_entry_size = 32;
+		return;
+	default: /* FIXME: s390/alpha/mips/parisc/poperpc/sh/xtensa need to be checked */
+		*plt_header_size = shdr_plt->sh_entsize;
+		*plt_entry_size = shdr_plt->sh_entsize;
+		return;
+	}
+}
+
 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
 	for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
 	     idx < nr_entries; \
@@ -411,32 +438,7 @@ int dso__synthesize_plt_symbols(struct dso *dso, struct symsrc *ss)
 
 	nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
 	plt_offset = shdr_plt.sh_offset;
-	switch (ehdr.e_machine) {
-		case EM_ARM:
-			plt_header_size = 20;
-			plt_entry_size = 12;
-			break;
-
-		case EM_AARCH64:
-			plt_header_size = 32;
-			plt_entry_size = 16;
-			break;
-
-		case EM_SPARC:
-			plt_header_size = 48;
-			plt_entry_size = 12;
-			break;
-
-		case EM_SPARCV9:
-			plt_header_size = 128;
-			plt_entry_size = 32;
-			break;
-
-		default: /* FIXME: s390/alpha/mips/parisc/poperpc/sh/xtensa need to be checked */
-			plt_header_size = shdr_plt.sh_entsize;
-			plt_entry_size = shdr_plt.sh_entsize;
-			break;
-	}
+	get_plt_sizes(&ehdr, &shdr_plt, &plt_header_size, &plt_entry_size);
 	plt_offset += plt_header_size;
 
 	if (shdr_rel_plt.sh_type == SHT_RELA) {
-- 
2.34.1