tb main
define regs 
call fprintf(stderr,"eax=%08x ebx=%08x ecx=%08x edx=%08x\nesi=%08x edi=%08x ebp=%08x esp=%08x eip=%08x\n",$eax,$ebx,$ecx,$edx,$esi,$edi,$ebp,$esp,$eip)
end
define si
stepi
regs
x/1i $eip
end
define ni
nexti
regs
x/1i $eip
end
b error
b errmsg
r -s test/fact-a.c