Use the ARM unwinder with dtrace to extract the stack when asked. With this

dtrace is able to display a stack trace similar to the one below.

# dtrace -p 603 -n 'tcp:kernel::receive { stack(); }'
  0     70                         :receive
              kernel`ip_input+0x140
              kernel`netisr_dispatch_src+0xb8
              kernel`ether_demux+0x1c4
              kernel`ether_nh_input+0x3a8
              kernel`netisr_dispatch_src+0xb8
              kernel`ether_input+0x60
              kernel`cpsw_intr_rx+0xac
              kernel`intr_event_execute_handlers+0x128
              kernel`ithread_loop+0xb4
              kernel`fork_exit+0x84
              kernel`swi_exit
              kernel`swi_exit

Tested by:	gnn
Sponsored by:	ABT Systems Ltd

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