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Added secondary linker config for C64 overlays (incl. demo program).
git-svn-id: svn://svn.cc65.org/cc65/trunk@5679 b7a2c559-68d2-44c3-8de9-860c34a00d81
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@ -122,6 +122,9 @@ endif
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nachtm: nachtm.o
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overlaydemo: overlaydemo.o
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@$(LD) -t $(SYS) -m $(basename $@).map -C $(SYS)-overlay.cfg -o $@ $^ $(CLIB)
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plasma: plasma.o
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sieve: sieve.o
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86
samples/overlaydemo.c
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86
samples/overlaydemo.c
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@ -0,0 +1,86 @@
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/*
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* Minimalistic overlay demo program.
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*
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* 2009-10-02, Oliver Schmidt (ol.sc@web.de)
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*
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*/
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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extern void _OVERLAY1_LOAD__, _OVERLAY1_SIZE__;
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extern void _OVERLAY2_LOAD__, _OVERLAY2_SIZE__;
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extern void _OVERLAY3_LOAD__, _OVERLAY3_SIZE__;
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void log (char *msg)
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{
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printf ("Log: %s\n", msg);
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}
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#pragma code-name (push, "OVERLAY1");
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void foo (void)
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{
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log ("Calling main from overlay 1");
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}
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#pragma code-name (pop);
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#pragma code-name (push, "OVERLAY2");
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void bar (void)
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{
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log ("Calling main from overlay 2");
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}
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#pragma code-name (pop);
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#pragma code-name (push, "OVERLAY3");
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void foobar (void)
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{
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log ("Calling main from overlay 3");
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}
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#pragma code-name(pop);
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unsigned char loadfile (char *name, void *addr, void *size)
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{
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int file = open (name, O_RDONLY);
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if (file == -1) {
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log ("Opening overlay file failed");
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return 0;
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}
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read (file, addr, (unsigned) size);
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close (file);
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return 1;
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}
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void main (void)
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{
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log ("Calling overlay 1 from main");
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if (loadfile ("overlaydemo.1", &_OVERLAY1_LOAD__, &_OVERLAY1_SIZE__)) {
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foo ();
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}
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log ("Calling overlay 2 from main");
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if (loadfile ("overlaydemo.2", &_OVERLAY2_LOAD__, &_OVERLAY2_SIZE__)) {
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bar ();
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}
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log ("Calling overlay 3 from main");
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if (loadfile ("overlaydemo.3", &_OVERLAY3_LOAD__, &_OVERLAY3_SIZE__)) {
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foobar ();
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}
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}
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57
src/ld65/cfg/c64-overlay.cfg
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57
src/ld65/cfg/c64-overlay.cfg
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@ -0,0 +1,57 @@
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SYMBOLS {
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__LOADADDR__: type = import;
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__EXEHDR__: type = import;
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__STACKSIZE__: type = weak, value = $0800; # 2k stack
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__OVERLAYSIZE__: type = weak, value = $1000; # 4k overlay
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}
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MEMORY {
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ZP: file = "", define = yes, start = $0002, size = $001A;
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LOADADDR: file = %O, start = $07FF, size = $0002;
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HEADER: file = %O, start = $0801, size = $000C;
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RAM: file = %O, define = yes, start = $080D, size = $C7F3 - __OVERLAYSIZE__ - __STACKSIZE__;
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OVL1: file = "%O.1", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
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OVL2: file = "%O.2", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
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OVL3: file = "%O.3", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
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OVL4: file = "%O.4", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
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OVL5: file = "%O.5", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
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OVL6: file = "%O.6", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
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OVL7: file = "%O.7", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
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OVL8: file = "%O.8", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
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OVL9: file = "%O.9", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
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}
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SEGMENTS {
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LOADADDR: load = LOADADDR, type = ro;
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EXEHDR: load = HEADER, type = ro;
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STARTUP: load = RAM, type = ro;
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LOWCODE: load = RAM, type = ro, optional = yes;
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INIT: load = RAM, type = ro, define = yes, optional = yes;
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CODE: load = RAM, type = ro;
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RODATA: load = RAM, type = ro;
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DATA: load = RAM, type = rw;
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ZPSAVE: load = RAM, type = bss;
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BSS: load = RAM, type = bss, define = yes;
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ZEROPAGE: load = ZP, type = zp;
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OVERLAY1: load = OVL1, type = ro, define = yes, optional = yes;
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OVERLAY2: load = OVL2, type = ro, define = yes, optional = yes;
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OVERLAY3: load = OVL3, type = ro, define = yes, optional = yes;
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OVERLAY4: load = OVL4, type = ro, define = yes, optional = yes;
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OVERLAY5: load = OVL5, type = ro, define = yes, optional = yes;
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OVERLAY6: load = OVL6, type = ro, define = yes, optional = yes;
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OVERLAY7: load = OVL7, type = ro, define = yes, optional = yes;
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OVERLAY8: load = OVL8, type = ro, define = yes, optional = yes;
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OVERLAY9: load = OVL9, type = ro, define = yes, optional = yes;
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}
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FEATURES {
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CONDES: segment = INIT,
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type = constructor,
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label = __CONSTRUCTOR_TABLE__,
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count = __CONSTRUCTOR_COUNT__;
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CONDES: segment = RODATA,
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type = destructor,
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label = __DESTRUCTOR_TABLE__,
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count = __DESTRUCTOR_COUNT__;
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CONDES: segment = RODATA,
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type = interruptor,
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label = __INTERRUPTOR_TABLE__,
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count = __INTERRUPTOR_COUNT__;
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}
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