[Ltrace-devel] ltrace v0.7.0-git: Session on a Freetz MIPSEL router box
Sedat Dilek
sedat.dilek at gmail.com
Mon Sep 3 17:36:52 UTC 2012
On Mon, Sep 3, 2012 at 7:28 PM, Sedat Dilek <sedat.dilek at gmail.com> wrote:
> On Mon, Sep 3, 2012 at 12:50 PM, Petr Machata <pmachata at redhat.com> wrote:
>> Sedat Dilek <sedat.dilek at gmail.com> writes:
>>
>>> as promised here my first impressions on ltrace v0.7.0-git on my
>>> MIPSEL router.
>>
>> Thank you for this. I'm trying to install Debian Wheezy on emulated
>> MIPS64el as I write this, but it takes ages to finish.
>>
>>> I have built ltrace statically against libelf-0.8.13,
>>> libstdc++.so.6.0.16 and etc.(see attached patch).
>>>
>>> Then, I uploaded ltrace binary together with upstream's ltrace.conf to
>>> /var/tmp/{etc}.
>>>
>>> Unfortunately, ltrace fails when tracing running daemons or ELF
>>> binaries.
>>
>> Daemons could be PIE (position independent) binaries, those are not
>> supported by ltrace.
>>
>>> I played a bit with --debug=LEVEL... I could see that the new config
>>> is used (required!) but using other parameters flooded here my box.
>>> Can you help with debugging?
>>
>> The config itself is only interesting for formatting displayed library
>> calls. You could just pass -F /dev/null. (But it doesn't hurt if the
>> file is there.)
>>
>>> root at fritz:/# cat /proc/version
>>> Linux version 2.6.13.1-ohio () (gcc version 3.4.6) #1 Tue Mar 27
>>> 16:53:06 CEST 2012
>>>
>>> root at fritz:/# cat /proc/cpuinfo
>>> system type : MIPS OHIO
>>> processor : 0
>>> cpu model : MIPS 4KEc V4.8
>>> BogoMIPS : 211.35
>>> wait instruction : yes
>>> microsecond timers : yes
>>> tlb_entries : 16
>>> extra interrupt vector : yes
>>> hardware watchpoint : yes
>>> VCED exceptions : not available
>>> VCEI exceptions : not available
>>>
>>> [ Start ltrace session ]
>>>
>>> root at fritz:/# ls -l /var/tmp/ltrace /var/tmp/etc/ltrace.conf
>>> -rw-r--r-- 1 root root 15598 Sep 2 15:49
>>> /var/tmp/etc/ltrace.conf
>>> -rwxr-xr-x 1 root root 297220 Sep 2 15:49 /var/tmp/ltrace
>>>
>>> root at fritz:/# ldd /var/tmp/ltrace
>>> not a dynamic executable
>>>
>>> root at fritz:/# /var/tmp/ltrace --version
>>> ltrace version 0.7.0-git.
>>> Copyright (C) 1997-2009 Juan Cespedes <cespedes at debian.org>.
>>> This is free software; see the GNU General Public Licence
>>> version 2 or later for copying conditions. There is NO warranty.
>>>
>>> root at fritz:/# ps w | grep d[s]ld
>>> 621 root 0 RWN [kdsld_token]
>>> 575 root 4000 S dsld -g -i -n
>>>
>>> root at fritz:/# /var/tmp/ltrace --config=/var/tmp/etc/ltrace.conf -p $(pidof dsld)
>>> --- SIGSTOP (Stopped (signal)) ---
>>> --- SIGSTOP (Stopped (signal)) ---
>>>
>>> root at fritz:/# /var/tmp/ltrace --config=/var/tmp/etc/ltrace.conf /sbin/dsltest
>>> unexpected breakpoint at 0x2acaf3d8
>>> unexpected breakpoint at 0x2acaf3d8
>>> unexpected breakpoint at 0x2acaf3d8
>>> unexpected breakpoint at 0x2acaf3d8
>>> unexpected breakpoint at 0x2acaf3d8
>>> unexpected breakpoint at 0x2acaf3d8
>>> unexpected breakpoint at 0x2acaf3d8
>>> unexpected breakpoint at 0x2acaf3d8
>>> unexpected breakpoint at 0x2acaf3d8
>>> unexpected breakpoint at 0x2acaf3d8
>>> unexpected breakpoint at 0x2acaf3d8
>>> unexpected breakpoint at 0x2acaf3d8
>>> +++ exited (status 3) +++
>>
>> Could you compile a trivial binary and see if that happens to work? As
>> in:
>>
>> $ echo 'int main() { puts("blah"); }' | gcc -x c -
>> $ ltrace ./a.out
>>
>
> Here we go...
>
> [ Build-Host ]
>
> $ ./toolchain/build/mipsel_gcc-4.6.3_uClibc-0.9.32.1/mipsel-linux-uclibc/bin/mipsel-linux-uclibc-gcc
> -v
> Using built-in specs.
> COLLECT_GCC=./toolchain/build/mipsel_gcc-4.6.3_uClibc-0.9.32.1/mipsel-linux-uclibc/bin/mipsel-linux-uclibc-gcc
> COLLECT_LTO_WRAPPER=/home/wearefam/src/freetz/freetz-git/toolchain/build/mipsel_gcc-4.6.3_uClibc-0.9.32.1/mipsel-linux-uclibc/bin/../libexec/gcc/mipsel-linux-uclibc/4.6.3/lto-wrapper
> Target: mipsel-linux-uclibc
> Configured with:
> /home/cam/freetz/source/toolchain-mipsel_gcc-4.6.3_uClibc-0.9.32.1/gcc-4.6.3/configure
> --prefix=/home/cam/freetz/toolchain/build/mipsel_gcc-4.6.3_uClibc-0.9.32.1/mipsel-linux-uclibc
> --with-sysroot=/home/cam/freetz/toolchain/build/mipsel_gcc-4.6.3_uClibc-0.9.32.1/mipsel-linux-uclibc/usr/
> --build=i386-pc-linux-gnu --host=i386-pc-linux-gnu
> --target=mipsel-linux-uclibc --enable-languages=c,c++ --enable-shared
> --enable-threads --with-gmp=/home/cam/freetz/tools/build
> --with-mpfr=/home/cam/freetz/tools/build
> --with-mpc=/home/cam/freetz/tools/build --with-gnu-ld
> --disable-__cxa_atexit --disable-libgomp --disable-libmudflap
> --disable-multilib --disable-tls --disable-fixed-point
> --with-float=soft --enable-cxx-flags=-msoft-float --disable-libssp
> --with-march=4kc --disable-nls --with-mips-plt --disable-decimal-float
> Thread model: posix
> gcc version 4.6.3 (GCC)
>
> $ echo 'int main() { puts("blah"); }' |
> ./toolchain/build/mipsel_gcc-4.6.3_uClibc-0.9.32.1/mipsel-linux-uclibc/bin/mipsel-linux-uclibc-gcc
> -x c -
>
> $ scp -v -p a.out root at 192.168.178.1:/var/tmp
>
> $ ssh root at 192.168.178.1
>
> [ SSH session ]
>
> root at fritz:/var/tmp# ls -l ltrace ltrace.conf a.out
> -rwxr-xr-x 1 root root 5550 Sep 3 19:21 a.out
> -rwxr-xr-x 1 root root 267980 Sep 3 18:42 ltrace
> -rw-r--r-- 1 root root 15598 Sep 3 18:42 ltrace.conf
>
> root at fritz:/var/tmp# ./ltrace --config=ltrace.conf ./a.out
> blah
> +++ exited (status 5) +++
>
> Regards,
> - Sedat -
>
> P.S.: "a.out" file attached!
>
>> Thank you,
>> PM
[ Addendum ]
root at fritz:/var/tmp# ./ltrace --config=ltrace.conf --debug=71 ./a.out
2>&1 | tee ltrace-debug-71.txt
- Sedat -
P.S.: ltrace-debug-71.txt (XZ-compressed) file attached!
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