CP & CMS

Debugging Facilities

CP Display• Displays contents of memory, regs, PSW

Display 0 100 200displays 3 locations

Display 0-200displays x'0' through x'200'

Display Pdisplays the current PSW

Display g5displays general register 5

Display t 1000.100displays 100 bytes WITH EBCDIC

CP Trace sets

• A Trace set is a collection of trace commands• Trace command samples:– Trace inst r 1000-2000

start @ x’1000’ to address x’2000’– Trace inst r 1000.16

start @ x’1000’ for 16 bytes– Trace prog

traces program checks • addressing• operation• specification (alignment, etc)• privilege• protection

CP Trace sets (more)

• Additional operands– Run does not stop at each breakpoint– End deletes the trace set– Stop n stops after ‘n’ displays of trace data

– Step nis a repeating STOP specification– Stop 3 Step 9

pauses after the 3rd and 12th displays and for every 9th display thereafter.