remoteType=cspect: watchpoints, unit tests

[maziac]

DeZog/CSpect (v2.12.22):

• Watchpoints work unreliable. Under unknown circumstances a watchpoint (aka CSpect read-breakpoint) might prevent simple stepping. In that case do not enable watchpoints (do not use "-wpmem enable".
• Z80 unit tests do not work. Most probably because of the Watchpoints issue as, even if wpmem is not used, the unit tests use watchpoints internally.

[maziac]

Here is a way to reproduce the problem even without DeZog or the DeZog plugin involved.
z80-sample-program.nex.zip

    org $8000
main:
    ; Disable interrupts
    ;di
    ei
    defb 0xDD, 0x01 ; CSpect break
    ld sp,stack_top

    ; CLS
    call clear_screen

Now I start CSpect (2.12.22):
mono CSpect.exe -w4 -exit -brk -tv z80-sample-program.nex

And set a read-breakpoint at 0x8023.

Then I step (F8). The debugger right away jumps into the interrupt.
And I step over (F8) the complete interrupt.

And step-out.

Now it becomes interesting.
The next step (F8) does not step-over the "LD SP,..." but again brings me to the ISR:

Stepping out and trying to step-over "LD SP,..." again leads to the same result: It is not possible to step-over "LD SP,...".

If I use the same program but disable the interrupts at the start (DI) then the debugger doesn't enter the ISR but it is also not possible to step-over the "LD SP,...".

Note: "LD SP,..." is here just by accident, I experienced this behavior also for other instructions.

[maziac]

Watchpoint are disabled for cspect and unit tests now.
Still the issue remains in cspect.

[maziac]

The described behavior (screen shots) is different with CSpect 2.16.6.
Anyhow I ran into a similar problem (was not able to step over an instruction) when enabling watchpoints.
So, the problem seems to remain.
The Watchpoints keep being disabled also for DeZog 3.0 for CSpect.