From: Namhyung Kim <namhyung@xxxxxxxxxx> [ Upstream commit 94df1040b1e6aacd8dec0ba3c61d7e77cd695f26 ] If a kernel modules is compressed, it should be decompressed before running objdump to parse binary data correctly. This fixes a failure of object code reading test for me. Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx> Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx> Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx> Cc: David Ahern <dsahern@xxxxxxxxx> Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> Cc: Wang Nan <wangnan0@xxxxxxxxxx> Cc: kernel-team@xxxxxxx Link: http://lkml.kernel.org/r/20170608073109.30699-8-namhyung@xxxxxxxxxx Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx> --- tools/perf/tests/code-reading.c | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-) diff --git a/tools/perf/tests/code-reading.c b/tools/perf/tests/code-reading.c index a767a6400c5c..6ea4fcfaab36 100644 --- a/tools/perf/tests/code-reading.c +++ b/tools/perf/tests/code-reading.c @@ -182,6 +182,8 @@ static int read_object_code(u64 addr, size_t len, u8 cpumode, unsigned char buf2[BUFSZ]; size_t ret_len; u64 objdump_addr; + const char *objdump_name; + char decomp_name[KMOD_DECOMP_LEN]; int ret; pr_debug("Reading object code for memory address: %#"PRIx64"\n", addr); @@ -242,9 +244,25 @@ static int read_object_code(u64 addr, size_t len, u8 cpumode, state->done[state->done_cnt++] = al.map->start; } + objdump_name = al.map->dso->long_name; + if (dso__needs_decompress(al.map->dso)) { + if (dso__decompress_kmodule_path(al.map->dso, objdump_name, + decomp_name, + sizeof(decomp_name)) < 0) { + pr_debug("decompression failed\n"); + return -1; + } + + objdump_name = decomp_name; + } + /* Read the object code using objdump */ objdump_addr = map__rip_2objdump(al.map, al.addr); - ret = read_via_objdump(al.map->dso->long_name, objdump_addr, buf2, len); + ret = read_via_objdump(objdump_name, objdump_addr, buf2, len); + + if (dso__needs_decompress(al.map->dso)) + unlink(objdump_name); + if (ret > 0) { /* * The kernel maps are inaccurate - assume objdump is right in -- 2.15.1