linux-kernel - Re: [PATCH v7 4/6] perf annotate: Support jump instruction with target as second operand

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 10 Oct 2016 19:04:15 +0530
From:   Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     linux-kernel@...r.kernel.org, kim.phillips@....com,
        linuxppc-dev@...ts.ozlabs.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        treeze.taeung@...il.com, naveen.n.rao@...ux.vnet.ibm.com,
        markus@...ppelsdorf.de, namhyung@...nel.org, pawel.moll@....com,
        chris.ryder@....com, jolsa@...nel.org, mhiramat@...nel.org,
        Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
Subject: Re: [PATCH v7 4/6] perf annotate: Support jump instruction with
 target as second operand



On Wednesday 05 October 2016 04:58 PM, Arnaldo Carvalho de Melo wrote:
> Em Wed, Sep 21, 2016 at 09:17:54PM +0530, Ravi Bangoria escreveu:
>> Current perf is not able to parse jump instruction when second operand
>> contains target address. Arch like powerpc has such instructions. For
>> example, 'bne  cr7,0xc0000000000f6154'.
>>
>> objdump o/p:
>>   c0000000000f6140:   ld     r9,1032(r31)
>>   c0000000000f6144:   cmpdi  cr7,r9,0
>>   c0000000000f6148:   bne    cr7,0xc0000000000f6154
>>   c0000000000f614c:   ld     r9,2312(r30)
>>   c0000000000f6150:   std    r9,1032(r31)
>>   c0000000000f6154:   ld     r9,88(r31)
> So the above is what is parsed to generate the following? Or these
> aren't related?

Yes, following is the perf annotate o/p from above objdump o/p.

-Ravi

>
>> Before patch:
>>          ld     r9,1032(r31)
>>          cmpdi  cr7,r9,0
>>       v  bne    3ffffffffff09f2c
>>          ld     r9,2312(r30)
>>          std    r9,1032(r31)
>>   74:    ld     r9,88(r31)
>>
>> After patch:
>>          ld     r9,1032(r31)
>>          cmpdi  cr7,r9,0
>>       v  bne    74
>>          ld     r9,2312(r30)
>>          std    r9,1032(r31)
>>   74:    ld     r9,88(r31)
>>
>> Signed-off-by: Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
>> ---
>> Changes in v7:
>>   - Added example in description
>>
>>  tools/perf/util/annotate.c | 6 +++++-
>>  1 file changed, 5 insertions(+), 1 deletion(-)
>>
>> diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
>> index 1ccf26a..a9dbac1 100644
>> --- a/tools/perf/util/annotate.c
>> +++ b/tools/perf/util/annotate.c
>> @@ -122,8 +122,12 @@ bool ins__is_call(const struct ins *ins)
>>  static int jump__parse(struct ins_operands *ops, struct map *map __maybe_unused)
>>  {
>>  	const char *s = strchr(ops->raw, '+');
>> +	const char *c = strchr(ops->raw, ',');
>>  
>> -	ops->target.addr = strtoull(ops->raw, NULL, 16);
>> +	if (c++ != NULL)
>> +		ops->target.addr = strtoull(c, NULL, 16);
>> +	else
>> +		ops->target.addr = strtoull(ops->raw, NULL, 16);
>>  
>>  	if (s++ != NULL)
>>  		ops->target.offset = strtoull(s, NULL, 16);
>> -- 
>> 2.5.5