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Posted By

Harry Potter
on 2024-02-20
08:08:11

cc65/c16: problem w/ Cubbyhole technique

Hi! I'm working on my AdvSkelVic65 and AdvSkel65 programs and am running into a problem: My emulator keeps crashing due to a JAM instruction being executed. The problem occurs in a location between $0200 and $02FF. I'm stuffing extra code there via my Cubbyhole optimization technique. I pasted the config file. Maybe a part of that area is being overwritten by the kernal?

---------------------------
SYMBOLS {
    __LOADADDR__:  type = import;
    __EXEHDR__:    type = import;
    __STACKSIZE__: type = weak, value = $0400; # 1k stack
#Size of used zeropage.  Change if necessary.
    __ZEROPAGESIZE__:type = weak, value = $0030;
}
MEMORY {
    ZP:       file = "", define = yes, start = $0002, size = $0030;
    #ZP2:      file = "stub5.prg",start=$0030, size = $0060;	# 96 bytes
    LOADADDR: file = %O,               start = $0FFF, size = $0002;
    HEADER:   file = %O,               start = $1001, size = $000C;
    MAIN:     file = %O,               start = $100D, size = $2FF3 - __STACKSIZE__;
    ZP2:      file = "stub4.prg",   start = __ZEROPAGESIZE__,
					size = $0090-__ZEROPAGESIZE__;
    BASBUF:   file = "stub1.prg",
			start = $01FE, size = $030E-$01FE;	#272 bytes
    TAPE:     file = "stub2.prg",
			start = $330, size = $0494-$0330;	#356 bytes
    BSTACK:   file = "stub3.prg",
			start = $065C, size = $07B2-$065C;	#342 bytes
}
SEGMENTS {
    ZEROPAGE: load = ZP,       type = zp;
    LOADADDR: load = LOADADDR, type = ro;
    EXEHDR:   load = HEADER,   type = ro;
    STARTUP:  load = MAIN,     type = ro;
    LOWCODE:  load = MAIN,     type = ro,  optional = yes;
    ONCE:     load = MAIN,     type = ro,  optional = yes;
    CODE:     load = MAIN,     type = ro;
    RODATA:   load = MAIN,     type = ro;
    DATA:     load = MAIN,     type = rw;
    INIT:     load = MAIN,     type = bss;
    BSS:      load = MAIN,     type = bss, define   = yes;
    INPUTH:   load = BASBUF,    type = ro;
    INPUTCO:  load = BASBUF,    type = ro,  optional = yes;
    INPUTRO:  load = BASBUF,    type = ro,  optional = yes;
    TAPEH:    load = TAPE,     type = ro;
    TAPECO:   load = TAPE,     type = ro,  optional = yes;
    TAPERO:   load = TAPE,     type = ro,  optional = yes;
    BSTKH:    load = BSTACK,   type = ro;
    BSTKCO:   load = BSTACK,   type = ro,  optional = yes;
    BSTKRO:   load = BSTACK,   type = ro,  optional = yes;
    ZP2H:     load = ZP2,      type = ro;
    ZP2CO:    load = ZP2,      type = ro,  optional = yes;
    ZP2RO:    load = ZP2,      type = ro,  optional = yes;
}
FEATURES {
    CONDES: type    = constructor,
            label   = __CONSTRUCTOR_TABLE__,
            count   = __CONSTRUCTOR_COUNT__,
            segment = ONCE;
    CONDES: type    = destructor,
            label   = __DESTRUCTOR_TABLE__,
            count   = __DESTRUCTOR_COUNT__,
            segment = RODATA;
    CONDES: type    = interruptor,
            label   = __INTERRUPTOR_TABLE__,
            count   = __INTERRUPTOR_COUNT__,
            segment = RODATA,
            import  = __CALLIRQ__;
}

Posted By

Harry Potter
on 2024-02-20
19:05:14

Re: cc65/c16: problem w/ Cubbyhole technique

I found the error: the memory area "BASBUF" was overwriting two bytes needed by the kernal for display purposes. I shortened it and moved some stuff our of the memory area, and now the multi-part C16 version of AdvSkelVic65 works properly. However, when I tried to fix the 128k Plus4 version of AdvSkel65, I get a "Missing memory area assignment" from the linker. I need to figure out where the memory area is being used.

Posted By

Harry Potter
on 2024-02-20
19:42:49

Re: cc65/c16: problem w/ Cubbyhole technique

I believe I know what the bug in the 128k Plus4 version of AdvSkel65 is: I'm calling the verb functions the wrong way. I have the pointer to the function declared as:

void (* vfunc) (void);

and the code that reads the address and delegates the call as:


-------------------
#if defined __USEFARMEM__ && !defined __C128__
		vfunc=hidereadw((void*)&Verb[Vrb].vdo);
		(*vfunc) ();
#else
		(*Verb[Vrb].vdo) ();
#endif
-------------------

__USEFARMEM__ is declared on the compile command line, and hidereadw() reads the word at the given address in Hannes memory. When I add test code, the verb #, name and address are all correct, but, if I use verb other than the first in its database, I get either the wrong messages or a system crash. BTW, all the verb functions are declared as void vVerb (void);.

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