Re: [BUG] perf test 21("Test object code reading") failure on ARM64
From: Jiri Olsa
Date: Thu Dec 17 2015 - 07:09:33 EST
adding Jan Stancek to the loop
jirka
On Thu, Dec 17, 2015 at 07:41:43PM +0800, xiakaixu wrote:
> Hi,
>
> Perf test "Test object code reading" failed on ARM64 board and the test log is here.
>
> ######################################################################################
> # perf test -v 21
> ...
> File is: /tmp/oxygen_root-root/lib64/libc-2.19-2014.08.so
> On file address is: 0x70c3c
> Objdump command is: objdump -z -d --start-address=0x70c3c --stop-address=0x70cbc /tmp/oxygen_root-root/lib64/libc-2.19-2014.08.so
> objdump read too few bytes
> Bytes read differ from those read by objdump
> buf1 (dso):
> 0x16 0x58 0x41 0xb9 0xf6 0x0e 0x00 0x35 0x00 0x00 0x00 0x90 0xbf 0x27 0x00 0xf9
> 0x00 0x40 0x22 0x91 0xa0 0x23 0x00 0xf9 0xb4 0x06 0x00 0xf0 0x55 0xd0 0x3b 0xd5
> 0x80 0xe2 0x14 0x91 0xb5 0xc2 0x1b 0xd1 0x00 0x60 0x00 0x91 0x01 0x04 0x40 0xf9
> 0x3f 0x00 0x15 0xeb 0xc0 0x01 0x00 0x54 0xbf 0x3f 0x00 0xb9 0x21 0x00 0x80 0x52
> 0x02 0xfc 0x5f 0x88 0x5f 0x00 0x1f 0x6b 0x61 0x00 0x00 0x54 0x01 0x7c 0x03 0x88
> 0x83 0xff 0xff 0x35 0x40 0x00 0x00 0x54 0xa2 0x3f 0x00 0xb9 0xa0 0x3f 0x40 0xb9
> 0xc0 0x0f 0x00 0x35 0x80 0xe2 0x14 0x91 0x15 0x10 0x00 0xf9 0x80 0xe2 0x14 0x91
> 0x62 0x02 0x40 0xb9 0x44 0x00 0x11 0x12 0x01 0x1c 0x40 0xb9 0x13 0x08 0x00 0xf9
>
> buf2 (objdump):
> 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
> 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
> 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
> 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
> 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
> 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
> 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
> 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
>
> test child finished with -1
> ---- end ----
> Test object code reading: FAILED!
> ######################################################################################
>
> The result of objdump on ARM64 like this:
> ...
> 70c40: 35000ef6 cbnz w22, 70e1c <_IO_link_in+0x208>
> 70c44: 90000000 adrp x0, 70000 <_IO_file_fopen+0x164>
> 70c48: f90027bf str xzr, [x29,#72]
> 70c4c: 91224000 add x0, x0, #0x890
> 70c50: f90023a0 str x0, [x29,#64]
> 70c54: f00006b4 adrp x20, 147000 <__abort_msg+0x588>
> ...
>
> So the following patch is needed.
> diff --git a/tools/perf/tests/code-reading.c b/tools/perf/tests/code-reading.c
> index a767a64..1b55fa0 100644
> --- a/tools/perf/tests/code-reading.c
> +++ b/tools/perf/tests/code-reading.c
> @@ -61,9 +61,6 @@ static size_t read_objdump_line(const char *line, size_t line_len, void *buf,
> if (i >= line_len || !isxdigit(line[i]))
> break;
> c2 = line[i++];
> - /* Followed by a space */
> - if (i < line_len && line[i] && !isspace(line[i]))
> - break;
> /* Store byte */
> *(unsigned char *)buf = (hex(c1) << 4) | hex(c2);
> buf += 1;
>
> After applying this patch, the test still failed.
> ######################################################################################
> ...
> Objdump command is: objdump -z -d --start-address=0x7c4c4 --stop-address=0x7c544 /tmp/oxygen_root-root/lib64/libc-2.19-2014.08.so
> Bytes read differ from those read by objdump
> buf1 (dso):
> 0x00 0x00 0x80 0xd2 0xd5 0xff 0xff 0x17 0xe0 0x03 0x19 0xaa 0xd3 0xff 0xff 0x17
> 0xe1 0x03 0x14 0xaa 0xa2 0x63 0x02 0x91 0xe0 0x03 0x13 0xaa 0x66 0xfe 0xff 0x97
> 0xfc 0x03 0x00 0xaa 0xa0 0x4f 0x40 0xf9 0xe2 0x03 0x1c 0xaa 0xe1 0x03 0x00 0xaa
> 0x08 0x00 0x67 0x9e 0x61 0x02 0x01 0x8b 0xe0 0x03 0x13 0xaa 0x60 0x01 0x00 0x94
> 0xe0 0xf9 0xff 0x35 0x95 0x07 0x00 0xd1 0x1b 0x00 0x80 0xd2 0x01 0x01 0x66 0x9e
> 0x60 0x02 0x15 0x8b 0x17 0x00 0x1c 0xcb 0xf8 0x03 0x1b 0xaa 0x0a 0x00 0x67 0x9e
> 0x20 0x00 0x80 0xd2 0x00 0x00 0x1c 0xcb 0x81 0x02 0x01 0xcb 0x09 0x00 0x67 0x9e
> 0x2b 0x00 0x67 0x9e 0x16 0x03 0x14 0x8b 0x20 0x03 0x1a 0x8b 0x01 0x00 0x80 0x52
>
> buf2 (objdump):
> 0xd2 0x80 0x00 0x00 0x17 0xff 0xff 0xd5 0xaa 0x19 0x03 0xe0 0x17 0xff 0xff 0xd3
> 0xaa 0x14 0x03 0xe1 0x91 0x02 0x63 0xa2 0xaa 0x13 0x03 0xe0 0x97 0xff 0xfe 0x66
> 0xaa 0x00 0x03 0xfc 0xf9 0x40 0x4f 0xa0 0xaa 0x1c 0x03 0xe2 0xaa 0x00 0x03 0xe1
> 0x9e 0x67 0x00 0x08 0x8b 0x01 0x02 0x61 0xaa 0x13 0x03 0xe0 0x94 0x00 0x01 0x60
> 0x35 0xff 0xf9 0xe0 0xd1 0x00 0x07 0x95 0xd2 0x80 0x00 0x1b 0x9e 0x66 0x01 0x01
> 0x8b 0x15 0x02 0x60 0xcb 0x1c 0x00 0x17 0xaa 0x1b 0x03 0xf8 0x9e 0x67 0x00 0x0a
> 0xd2 0x80 0x00 0x20 0xcb 0x1c 0x00 0x00 0xcb 0x01 0x02 0x81 0x9e 0x67 0x00 0x09
> 0x9e 0x67 0x00 0x2b 0x8b 0x14 0x03 0x16 0x8b 0x1a 0x03 0x20 0x52 0x80 0x00 0x01
>
> test child finished with -1
> ---- end ----
> Test object code reading: FAILED!
> ######################################################################################
>
> Seems the dso file format is different between x86 and ARM64.
> Maybe this test case only works fine on x86.
> --
> Regards
> Kaixu Xia
>
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