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Re: debugging a dynamically loaded library
- To: Kevin Buettner <kevinb at cygnus dot com>
- Subject: Re: debugging a dynamically loaded library
- From: Mike Krogh <krogh at ceintl dot com>
- Date: Tue, 18 Sep 2001 17:10:38 -0400
- Cc: "H . J . Lu" <hjl at lucon dot org>, Mike Krogh <krogh at ceintl dot com>, gdb at sourceware dot cygnus dot com
- References: <1010903225850.ZM1797@ocotillo.lan>
Kevin,
Can you tell me if any more progress has been made with this problem?
Do you have any ETA on when a resolution might be available? Since
your email address is at 'cygnus.com', I'm assuming that you might be
one of the maintainers of gdb. If not, any suggestions on who I might
contact would be appreciated!
Anything I might be able to do?
Thanks!
Mike
> On Aug 29, 4:07pm, H . J . Lu wrote:
>> > (gdb) b main.c:23
>> > Breakpoint 1 at 0x80487fc: file main.c, line 23.
>> > (gdb) r
>> > Starting program: /home/kev/ctests/dynlib/main
>> >
>> > Breakpoint 1, main (argc=1, argv=0xbffffa2c) at main.c:23
>> > 23 init = dlsym(handle, "dso_init");
>> > (gdb) b dso_init
>> > Breakpoint 2 at 0x400188a2: file dso.c, line 10.
>>
>> For some reason, it doesn't work for me:
>>
>> GNU gdb 2001-08-29-cvs (MI_OUT)
>> ....
>> (gdb) b main.c:23
>> Breakpoint 1 at 0x8048820: file main.c, line 23.
>> (gdb) r
>> Starting program: /home/hjl/bugs/gdb/dlopen/main
>>
>> Breakpoint 1, main (argc=1, argv=0xbffff804) at main.c:23
>> 23 init = dlsym(handle, "dso_init");
>> (gdb) b dso_init
>> Cannot access memory at address 0x123
>> (gdb) p dso_init
>> $1 = {<text variable, no debug info>} 0x40017800 <dso_init>
>> (gdb) info shared
>> >From To Syms Read Shared Object Library
>> 0x400281d0 0x40028fc0 Yes /lib/libdl.so.2
>> 0x40047400 0x40147080 Yes /lib/i686/libc.so.6
>> 0x40001eb0 0x40012f20 Yes /lib/ld-linux.so.2
>> 0x400176d0 0x400178b0 Yes ./dso.so
>>
>> I am using glibc 2.2.4 on x86. It seems that gdb doesn't add the base
>> address of ./dso.so.
> H. J.,
> Could you try
> http://sources.redhat.com/ml/gdb-patches/2001-09/msg00003.html
> and let me know if it fixes the above problem?
> Thanks,
> Kevin
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