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Re: Tutorial on debugging with an alternate loader
- From: Ryan Arnold <ryan dot arnold at gmail dot com>
- To: Daniel De La Zerda <danieldelazerda at gmail dot com>
- Cc: "Carlos O'Donell" <carlos at systemhalted dot org>, libc-help at sourceware dot org, pasky at suse dot cz
- Date: Thu, 16 Apr 2009 12:35:29 -0500
- Subject: Re: Tutorial on debugging with an alternate loader
- References: <684720.61839.qm@web63201.mail.re1.yahoo.com> <335499.11939.qm@web63206.mail.re1.yahoo.com> <119aab440903181350s9a21410tff40cf9d37301819@mail.gmail.com> <588946.38944.qm@web63206.mail.re1.yahoo.com> <119aab440903181431p6b55bf9dnd3f1fb4caffbbf8b@mail.gmail.com> <680017.83123.qm@web63206.mail.re1.yahoo.com> <119aab440903191247h68392104qadfbb4ab0b0a8ea5@mail.gmail.com> <740092.5205.qm@web63206.mail.re1.yahoo.com> <ff4da150903191905r6b284d79s65c3eb0bb7f96e69@mail.gmail.com> <396494.10605.qm@web63201.mail.re1.yahoo.com>
On Thu, Apr 16, 2009 at 11:32 AM, Daniel De La Zerda
<ddelazerda007@yahoo.com> wrote:
> set environment C -E -x c-header
> break _dl_main_dispatch
> run --library-path
> /home/devel/src/rpm/BUILD/glibc-2.4-copy/my-glibc-build:\
> /home/devel/src/rpm/BUILD/glibc-2.4-copy/my-glibc-build/nptl:\
> /home/devel/src/rpm/BUILD/glibc-2.4-copy/my-glibc-build/math:\
> /home/devel/src/rpm/BUILD/glibc-2.4-copy/my-glibc-build/elf:\
> /home/devel/src/rpm/BUILD/glibc-2.4-copy/my-glibc-build/dlfcn:\
> /home/devel/src/rpm/BUILD/glibc-2.4-copy/my-glibc-build/nss:\
> /home/devel/src/rpm/BUILD/glibc-2.4-copy/my-glibc-build/nis:\
> /home/devel/src/rpm/BUILD/glibc-2.4-copy/my-glibc-build/rt:\
> /home/devel/src/rpm/BUILD/glibc-2.4-copy/my-glibc-build/resolv:\
> /home/devel/src/rpm/BUILD/glibc-2.4-copy/my-glibc-build/crypt:\
> /home/devel/src/rpm/BUILD/glibc-2.4-copy/my-glibc-build/nptl:\
> /home/devel/src/rpm/BUILD/glibc-2.4-copy/my-glibc-build/nptl_db \
> /home/devel/src/rpm/BUILD/test/minicond_clock_test
>
> minicond_clock_test is the executable that I want to debug.
>
> When I run the bash script above I get the following error:
>
> "-x: error while loading shared libraries: -x: cannot open shared object file: No such file or directory"
>
> This is strange because I did an "ls" on every path of the bash script and their are all valid paths. I don't know what else could it be. If you need more information, I will be glad to provide.
>
> Thank you for your time,
>
> Daniel
One problem I see right away is with '_dl_main_dispatch'. That symbol
isn't available on x86[-64] so you'll have to find somewhere else to
break.
With regard to -x, is this error actually referring to the gdb
environment -x or the gdb invocation? Perhaps older versions of gdb
don't support -x?
Ryan