remoteType=cspect: watchpoints, unit tests

maziac commented 4 years ago

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 commented 4 years ago

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.

Bildschirmfoto_2020-04-30_um_10 46 51

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 commented 3 years ago

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

maziac commented 1 year ago

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.

maziac / DeZog

remoteType=cspect: watchpoints, unit tests #18