User guide

Chapter 7
The Debugger
Both Cintsys and Cintpos have interactive debuggers but these are slightly different
and so wi l l be described separately.
7.1 The C intsys Debugger
When the Cintsys starts up, control first passes to BOOT which initialises the system
and creates a running environment for the com mand language interpreter (CLI). This
is run by a recursive invocation of the interpreter and so when faults occur control
returns to BOOT which th en enters an interactive debugger. Thi s allows the user to
inspect the state of the regi st e r s and memory, and perform other debugging operations
on t he faulted program. The debugger can also be entered using the abort command,
as follows:
560> abort
!! ABORT 99: User requested
*
The asterisk (*) is the debugger’s prompt character. A brief description of the avai l abl e
debug commands can be display using the query (?) command.
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