[Crash-utility] crash on x86_64: how to dump arg registers?

Hello all, I'm trying to get myself ramped to using crash on x86_64. In x86_64 there is no register stack and function arguments aren't typically placed on the stack, therefore we aren't able to see the function arguments in the bt -f output. Is there a trick to dumping out %rdi, %rsi, %rdx, etc? I hope this isn't too lame of a question. I'm just getting my toes wet with x86_64 and kdump/crash. Thanks in advance, Paul Sanders SGI Global Product Support