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Added secondary linker config for C64 overlays (incl. demo program).

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git-svn-id: svn://svn.cc65.org/cc65/trunk@5679 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
ol.sc 2012-06-03 16:16:11 +00:00
parent ea51c5a4e2
commit 3cb0cce00d
3 changed files with 146 additions and 0 deletions
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3
samples/Makefile
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@ -122,6 +122,9 @@ endif
nachtm: nachtm.o
overlaydemo: overlaydemo.o
@$(LD) -t $(SYS) -m $(basename $@).map -C $(SYS)-overlay.cfg -o $@ $^ $(CLIB)
plasma: plasma.o
sieve: sieve.o

86
samples/overlaydemo.c Normal file
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@ -0,0 +1,86 @@
/*
* Minimalistic overlay demo program.
*
* 2009-10-02, Oliver Schmidt (ol.sc@web.de)
*
*/
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
extern void _OVERLAY1_LOAD__, _OVERLAY1_SIZE__;
extern void _OVERLAY2_LOAD__, _OVERLAY2_SIZE__;
extern void _OVERLAY3_LOAD__, _OVERLAY3_SIZE__;
void log (char *msg)
{
printf ("Log: %s\n", msg);
}
#pragma code-name (push, "OVERLAY1");
void foo (void)
{
log ("Calling main from overlay 1");
}
#pragma code-name (pop);
#pragma code-name (push, "OVERLAY2");
void bar (void)
{
log ("Calling main from overlay 2");
}
#pragma code-name (pop);
#pragma code-name (push, "OVERLAY3");
void foobar (void)
{
log ("Calling main from overlay 3");
}
#pragma code-name(pop);
unsigned char loadfile (char *name, void *addr, void *size)
{
int file = open (name, O_RDONLY);
if (file == -1) {
log ("Opening overlay file failed");
return 0;
}
read (file, addr, (unsigned) size);
close (file);
return 1;
}
void main (void)
{
log ("Calling overlay 1 from main");
if (loadfile ("overlaydemo.1", &_OVERLAY1_LOAD__, &_OVERLAY1_SIZE__)) {
foo ();
}
log ("Calling overlay 2 from main");
if (loadfile ("overlaydemo.2", &_OVERLAY2_LOAD__, &_OVERLAY2_SIZE__)) {
bar ();
}
log ("Calling overlay 3 from main");
if (loadfile ("overlaydemo.3", &_OVERLAY3_LOAD__, &_OVERLAY3_SIZE__)) {
foobar ();
}
}

57
src/ld65/cfg/c64-overlay.cfg Normal file
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@ -0,0 +1,57 @@
SYMBOLS {
__LOADADDR__: type = import;
__EXEHDR__: type = import;
__STACKSIZE__: type = weak, value = $0800; # 2k stack
__OVERLAYSIZE__: type = weak, value = $1000; # 4k overlay
}
MEMORY {
ZP: file = "", define = yes, start = $0002, size = $001A;
LOADADDR: file = %O, start = $07FF, size = $0002;
HEADER: file = %O, start = $0801, size = $000C;
RAM: file = %O, define = yes, start = $080D, size = $C7F3 - __OVERLAYSIZE__ - __STACKSIZE__;
OVL1: file = "%O.1", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL2: file = "%O.2", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL3: file = "%O.3", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL4: file = "%O.4", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL5: file = "%O.5", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL6: file = "%O.6", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL7: file = "%O.7", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL8: file = "%O.8", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL9: file = "%O.9", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
}
SEGMENTS {
LOADADDR: load = LOADADDR, type = ro;
EXEHDR: load = HEADER, type = ro;
STARTUP: load = RAM, type = ro;
LOWCODE: load = RAM, type = ro, optional = yes;
INIT: load = RAM, type = ro, define = yes, optional = yes;
CODE: load = RAM, type = ro;
RODATA: load = RAM, type = ro;
DATA: load = RAM, type = rw;
ZPSAVE: load = RAM, type = bss;
BSS: load = RAM, type = bss, define = yes;
ZEROPAGE: load = ZP, type = zp;
OVERLAY1: load = OVL1, type = ro, define = yes, optional = yes;
OVERLAY2: load = OVL2, type = ro, define = yes, optional = yes;
OVERLAY3: load = OVL3, type = ro, define = yes, optional = yes;
OVERLAY4: load = OVL4, type = ro, define = yes, optional = yes;
OVERLAY5: load = OVL5, type = ro, define = yes, optional = yes;
OVERLAY6: load = OVL6, type = ro, define = yes, optional = yes;
OVERLAY7: load = OVL7, type = ro, define = yes, optional = yes;
OVERLAY8: load = OVL8, type = ro, define = yes, optional = yes;
OVERLAY9: load = OVL9, type = ro, define = yes, optional = yes;
}
FEATURES {
CONDES: segment = INIT,
type = constructor,
label = __CONSTRUCTOR_TABLE__,
count = __CONSTRUCTOR_COUNT__;
CONDES: segment = RODATA,
type = destructor,
label = __DESTRUCTOR_TABLE__,
count = __DESTRUCTOR_COUNT__;
CONDES: segment = RODATA,
type = interruptor,
label = __INTERRUPTOR_TABLE__,
count = __INTERRUPTOR_COUNT__;
}