linux-kernel - Re: [BUG] perf test 21("Test object code reading") failure on ARM64

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Message-ID: <5674C935.7010009@huawei.com>
Date:	Sat, 19 Dec 2015 11:04:21 +0800
From:	xiakaixu <xiakaixu@...wei.com>
To:	Jan Stancek <jstancek@...hat.com>
CC:	Jiri Olsa <jolsa@...hat.com>,
	adrian hunter <adrian.hunter@...el.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	masami hiramatsu pt <masami.hiramatsu.pt@...achi.com>,
	<linux-kernel@...r.kernel.org>, "Wangnan (F)" <wangnan0@...wei.com>
Subject: Re: [BUG] perf test 21("Test object code reading") failure on ARM64


>>>    ...
> 
> Hi,
> 
> What is your objdump version?

Hi,

Sorry for the late reply.

# objdump --version
GNU objdump (GNU Binutils) 2.25.

I am sure that the system is Little endian.
> 
>>>
>>> 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
> 
> The data appears to match, but the endian is different.
> 
> Regards,
> Jan
> 
>>>
>>>   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
>>>
>>
> 
> .
> 


-- 
Regards
Kaixu Xia

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