linux-kernel - [PATCH 6/7] perf inject: Fix GEN_ELF_TEXT

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Message-Id: <20221014170905.64069-7-adrian.hunter@intel.com>
Date:   Fri, 14 Oct 2022 20:09:04 +0300
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 6/7] perf inject: Fix GEN_ELF_TEXT_OFFSET for jit

When a program header was added, it moved the text section but
GEN_ELF_TEXT_OFFSET was not updated.

Fix by adding the program header size and aligning.

Fixes: babd04386b1d ("perf jit: Include program header in ELF files")
Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 tools/perf/util/genelf.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/genelf.h b/tools/perf/util/genelf.h
index b5c909546e3f..6af062d1c452 100644
--- a/tools/perf/util/genelf.h
+++ b/tools/perf/util/genelf.h
@@ -2,6 +2,8 @@
 #ifndef __GENELF_H__
 #define __GENELF_H__
 
+#include <linux/math.h>
+
 /* genelf.c */
 int jit_write_elf(int fd, uint64_t code_addr, const char *sym,
 		  const void *code, int csize, void *debug, int nr_debug_entries,
@@ -76,6 +78,6 @@ int jit_add_debug_info(Elf *e, uint64_t code_addr, void *debug, int nr_debug_ent
 #endif
 
 /* The .text section is directly after the ELF header */
-#define GEN_ELF_TEXT_OFFSET sizeof(Elf_Ehdr)
+#define GEN_ELF_TEXT_OFFSET round_up(sizeof(Elf_Ehdr) + sizeof(Elf_Phdr), 16)
 
 #endif
-- 
2.25.1