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perf tests: Take into account address of each objdump line

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objdump output can contain repeated bytes. At the moment test reads all
output sequentially, assuming each address is represented in output only
once:

  ffffffff8164efb3 <retint_swapgs+0x9>:
  ffffffff8164efb3:  c1 5d 00 eb        rcrl   $0xeb,0x0(%rbp)
  ffffffff8164efb7:  00 4c 8b 5c        add    %cl,0x5c(%rbx,%rcx,4)

  ffffffff8164efb8 <restore_c_regs_and_iret>:
  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 <jstancek@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/ad13289a55d6350f7717757c7e32c2d4286402bd.1441181335.git.jstancek@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jan Stancek 2015-09-02 10:19:14 +02:00 committed by Arnaldo Carvalho de Melo
parent 8f3e5684d3
commit 729a7ed103
1 changed files with 38 additions and 13 deletions
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51
tools/perf/tests/code-reading.c
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@ -33,20 +33,20 @@ static unsigned int hex(char c)
return c - 'A' + 10; return c - 'A' + 10;
} }
static void read_objdump_line(const char *line, size_t line_len, void **buf, static size_t read_objdump_line(const char *line, size_t line_len, void *buf,
size_t *len) size_t len)
{ {
const char *p; const char *p;
size_t i; size_t i, j = 0;
/* Skip to a colon */ /* Skip to a colon */
p = strchr(line, ':'); p = strchr(line, ':');
if (!p) if (!p)
return; return 0;
i = p + 1 - line; i = p + 1 - line;
/* Read bytes */ /* Read bytes */
while (*len) { while (j < len) {
char c1, c2; char c1, c2;
/* Skip spaces */ /* 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])) if (i < line_len && line[i] && !isspace(line[i]))
break; break;
/* Store byte */ /* Store byte */
*(unsigned char *)*buf = (hex(c1) << 4) | hex(c2); *(unsigned char *)buf = (hex(c1) << 4) | hex(c2);
*buf += 1; buf += 1;
*len -= 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; char *line = NULL;
size_t line_len; size_t line_len, off_last = 0;
ssize_t ret; ssize_t ret;
int err = 0; 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); ret = getline(&line, &line_len, f);
if (feof(f)) if (feof(f))
break; break;
@ -87,9 +93,28 @@ static int read_objdump_output(FILE *f, void **buf, size_t *len)
err = -1; err = -1;
break; 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); free(line);
return err; return err;
@ -120,7 +145,7 @@ static int read_via_objdump(const char *filename, u64 addr, void *buf,
return -1; return -1;
} }
ret = read_objdump_output(f, &buf, &len); ret = read_objdump_output(f, buf, &len, addr);
if (len) { if (len) {
pr_debug("objdump read too few bytes\n"); pr_debug("objdump read too few bytes\n");
if (!ret) if (!ret)