changiing rtld.c

[Aldy Hernandez]

Hi guys.

I have a question...

I'm working on some PPC hacks for glibc, which have triggered a SIGFPE
in ld.so.1.  Gdbing the process doesn't help because the backtrace
just takes me back to some unrecognizeable (to me) instructions.

I'm trying to track down where the SIGFPE got generated.

So I hacked rtld.c's dl_main() like thus:

  signal(SIGFPE, myh);

to catch the signal in myh().  Perhaps I can put a breakpoint on myh()
and go up the chain that way.  I dunno if this is the appropriate way
of debugging this sort of thing.

However, I keep getting:


/local/aldy/sep-18/glibc/libc_pic.a(init-first.os): In function `init':
/kermit/source/glibc-2.2.5/csu/../sysdeps/unix/sysv/linux/init-first.c:59: multiple definition of `__libc_multiple_libcs'
/local/aldy/sep-18/glibc/elf/dl-allobjs.os:/kermit/source/altivec-020216-branch/devo/glibc/elf/../sysdeps/powerpc/dl-machine.h:345: first defined here
/local/aldy/sep-18/glibc/libc_pic.a(init-first.os): In function `_dl_start':
/kermit/source/glibc-2.2.5/csu/../sysdeps/unix/sysv/linux/init-first.c:138: multiple definition of `_dl_start'
/local/aldy/sep-18/glibc/elf/dl-allobjs.os:/kermit/source/altivec-020216-branch/devo/glibc/elf/rtld.c:171: first defined here
/local/aldy/sep-18/glibc/../tools-install/bin/../lib/gcc-lib/powerpc-unknown-linux-gnu/3.1-altivec-020603/../../../../powerpc-unknown-linux-gnu/bin/ld: Warning: size of symbol `_dl_start' changed from 404 to 16 in /local/aldy/sep-18/glibc/libc_pic.a(init-first.os)


Hints, tips?  Am I going about it the wrong way?

Aldy