From edfdb7eab0fe5f98f2951598dc679b71bdb3e16b Mon Sep 17 00:00:00 2001 From: Jan Stancek Date: Wed, 2 Sep 2015 10:19:16 +0200 Subject: [PATCH] perf tests: Stop reading if objdump output crossed sections objdump output can span across multiple sections: Disassembly of section .text: 0000000000000008 : 8: 48 89 e5 mov %rsp,%rbp b: 53 push %rbx c: 8b 01 mov (%rcx),%eax 6b: 90 nop Disassembly of section .init.text: 0000000000000008 : 8: 00 00 add %al,(%rax) a: 00 00 add %al,(%rax) c: 48 89 e5 Stop further reading if an address starts going backwards, assuming we crossed sections. Signed-off-by: Jan Stancek Acked-by: Adrian Hunter Cc: Corey Ashford Cc: David Ahern Cc: Frederic Weisbecker Cc: Jiri Olsa Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/9d1ea95e5f9884fdff1be6f761a2feabef37412c.1441181335.git.jstancek@redhat.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/tests/code-reading.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/tools/perf/tests/code-reading.c b/tools/perf/tests/code-reading.c index c409409d7765..8145c67fb43a 100644 --- a/tools/perf/tests/code-reading.c +++ b/tools/perf/tests/code-reading.c @@ -79,7 +79,7 @@ static int read_objdump_output(FILE *f, void *buf, size_t *len, u64 start_addr) size_t line_len, off_last = 0; ssize_t ret; int err = 0; - u64 addr; + u64 addr, last_addr = start_addr; while (off_last < *len) { size_t off, read_bytes, written_bytes; @@ -101,6 +101,11 @@ static int read_objdump_output(FILE *f, void *buf, size_t *len, u64 start_addr) if (sscanf(line, "%"PRIx64, &addr) != 1) continue; + if (addr < last_addr) { + pr_debug("addr going backwards, read beyond section?\n"); + break; + } + last_addr = addr; /* copy it from temporary buffer to 'buf' according * to address on current objdump line */ -- 2.20.1