From 729a7ed103ae1b04a5c87a5855885e0973161da4 Mon Sep 17 00:00:00 2001 From: Jan Stancek Date: Wed, 2 Sep 2015 10:19:14 +0200 Subject: [PATCH] perf tests: Take into account address of each objdump line objdump output can contain repeated bytes. At the moment test reads all output sequentially, assuming each address is represented in output only once: ffffffff8164efb3 : ffffffff8164efb3: c1 5d 00 eb rcrl $0xeb,0x0(%rbp) ffffffff8164efb7: 00 4c 8b 5c add %cl,0x5c(%rbx,%rcx,4) ffffffff8164efb8 : ffffffff8164efb8: 4c 8b 5c 24 30 mov 0x30(%rsp),%r11 ffffffff8164efbd: 4c 8b 54 24 38 mov 0x38(%rsp),%r10 Store objdump output to buffer according to offset calculated from address on each line. Signed-off-by: Jan Stancek Cc: 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/ad13289a55d6350f7717757c7e32c2d4286402bd.1441181335.git.jstancek@redhat.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/tests/code-reading.c | 51 ++++++++++++++++++++++++++++++----------- 1 file changed, 38 insertions(+), 13 deletions(-) diff --git a/tools/perf/tests/code-reading.c b/tools/perf/tests/code-reading.c index 39c784a..38ee90b 100644 --- a/tools/perf/tests/code-reading.c +++ b/tools/perf/tests/code-reading.c @@ -33,20 +33,20 @@ static unsigned int hex(char c) return c - 'A' + 10; } -static void read_objdump_line(const char *line, size_t line_len, void **buf, - size_t *len) +static size_t read_objdump_line(const char *line, size_t line_len, void *buf, + size_t len) { const char *p; - size_t i; + size_t i, j = 0; /* Skip to a colon */ p = strchr(line, ':'); if (!p) - return; + return 0; i = p + 1 - line; /* Read bytes */ - while (*len) { + while (j < len) { char c1, c2; /* Skip spaces */ @@ -65,20 +65,26 @@ static void read_objdump_line(const char *line, size_t line_len, void **buf, if (i < line_len && line[i] && !isspace(line[i])) break; /* Store byte */ - *(unsigned char *)*buf = (hex(c1) << 4) | hex(c2); - *buf += 1; - *len -= 1; + *(unsigned char *)buf = (hex(c1) << 4) | hex(c2); + buf += 1; + j++; } + /* return number of successfully read bytes */ + return j; } -static int read_objdump_output(FILE *f, void **buf, size_t *len) +static int read_objdump_output(FILE *f, void *buf, size_t *len, u64 start_addr) { char *line = NULL; - size_t line_len; + size_t line_len, off_last = 0; ssize_t ret; int err = 0; + u64 addr; + + while (off_last < *len) { + size_t off, read_bytes, written_bytes; + unsigned char tmp[BUFSZ]; - while (1) { ret = getline(&line, &line_len, f); if (feof(f)) break; @@ -87,9 +93,28 @@ static int read_objdump_output(FILE *f, void **buf, size_t *len) err = -1; break; } - read_objdump_line(line, ret, buf, len); + + /* read objdump data into temporary buffer */ + read_bytes = read_objdump_line(line, ret, tmp, sizeof(tmp)); + if (!read_bytes) + continue; + + if (sscanf(line, "%"PRIx64, &addr) != 1) + continue; + + /* copy it from temporary buffer to 'buf' according + * to address on current objdump line */ + off = addr - start_addr; + if (off >= *len) + break; + written_bytes = MIN(read_bytes, *len - off); + memcpy(buf + off, tmp, written_bytes); + off_last = off + written_bytes; } + /* len returns number of bytes that could not be read */ + *len -= off_last; + free(line); return err; @@ -120,7 +145,7 @@ static int read_via_objdump(const char *filename, u64 addr, void *buf, return -1; } - ret = read_objdump_output(f, &buf, &len); + ret = read_objdump_output(f, buf, &len, addr); if (len) { pr_debug("objdump read too few bytes\n"); if (!ret) -- 2.7.4