tb main
define regs 
call (void)printf("rax=%16lx rbx=%16lx\nrcx=%16lx rdx=%16lx\nrsi=%16lx rdi=%16lx rbp=%16lx \nrsp=%16lx pc=%08lx\n",$rax,$rbx,$rcx,$rdx,$rsi,$rdi,$rbp,$rsp,$pc)
end
define si
stepi
regs
x/1i $pc
end
define ni
nexti
regs
x/1i $pc
end