Graphical desktop, l4con, mag

Leslie Zhai lesliezhai at llvm.org.cn
Fri Jun 2 10:37:35 CEST 2017



在 2017年06月02日 15:34, Jean Wolter 写道:
>
> Hello Leslie,
>
> On 02/06/17 05:52, Leslie Zhai wrote:
>> Thanks for your reply! but I met the same story for L4Linux 
>> https://pbs.twimg.com/media/DBSQtoNUIAEE2HY.png
> It looks like the very same error, an unhandled read page-fault at 
> address 0x18 triggered by an instruction at 0x102d72a.
>
>> > Maybe you could use addr2line/objdump
>> > to figure out, what happens at address 0x102d72a in ned.
>>
>> cd /home/zhaixiang/project/l4re/l4/build
>> addr2line -p -e bin/amd64_K8/l4f/ned 0x102d72a
>>
>> but there is no output easy to read for humans, I am not familiar 
>> with addr2line, please give me some advice, thanks a lot!
> If I try it with an instruction pointer somewhere in the main function 
> it looks like follows:
>
>     ~/build/tmp/l4re/bin/amd64_K8/l4f$ addr2line -p -i -e ned -a 10038b3
>     0x00000000010038b3:
>     /home/.../src/l4resvn/src/l4/pkg/l4re-core/ned/server/src/main.cc:39
>      (inlined by)
>     /home/.../src/l4resvn/src/l4/pkg/l4re-core/ned/server/src/main.cc:75
>
>
>> objdump -D bin/amd64_K8/l4f/ned > ned.S
>>
> If you use -lSd you should see line number information in the 
> disassembled output, e.g:
>
>     /home/.../src/l4resvn/src/l4/pkg/l4re-core/ned/server/src/main.cc:39
>       for (int i = 0; i < argc; ++i)
>      10038b3:       85 db                   test   %ebx,%ebx
>
>
>> 102d72a:   66 0f 12 05 9e 7b 02    movlpd 0x27b9e(%rip),%xmm0 # 
>> 10552d0 <_ZL7HOOKKEY+0x        8>
>> is it enough to figure out what happened? if not, I will upload the 
>> disassemble to my Google drive.
> This looks strange. There is nothing looking like an access to 0x18. 
> Could send me your ned binary?
https://drive.google.com/open?id=0ByE8c-y74l_uVlB6cnJBdWV1VzA


>
> regards,
> Jean
>

-- 
Regards,
Leslie Zhai - a LLVM hacker https://reviews.llvm.org/p/xiangzhai/

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