ppc Linux-2.4.2 not generating core dump for SIGSEGV and abort()

Hi all,
     I am using Suse-linux-7.1 with default linux -ppc kernel on apple G4
machine.
SIGSEGV is never generating the core dump. though this signal is being
caught by the user process.
I also tried with "abort" call which should generate the core dump, but
this is also not working. The same program with abort call is generating
core dumps on other linux/unix platforms.
Can anybody tell me where is the problem?

Daljeet.