From 3cb0cce00d689818657a1c2e4d058be7b3f2dc42 Mon Sep 17 00:00:00 2001 From: "ol.sc" Date: Sun, 3 Jun 2012 16:16:11 +0000 Subject: [PATCH] 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 --- samples/Makefile | 3 ++ samples/overlaydemo.c | 86 ++++++++++++++++++++++++++++++++++++ src/ld65/cfg/c64-overlay.cfg | 57 ++++++++++++++++++++++++ 3 files changed, 146 insertions(+) create mode 100644 samples/overlaydemo.c create mode 100644 src/ld65/cfg/c64-overlay.cfg diff --git a/samples/Makefile b/samples/Makefile index a5bf9acef..746de79a7 100644 --- a/samples/Makefile +++ b/samples/Makefile @@ -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 diff --git a/samples/overlaydemo.c b/samples/overlaydemo.c new file mode 100644 index 000000000..02451a28a --- /dev/null +++ b/samples/overlaydemo.c @@ -0,0 +1,86 @@ +/* + * Minimalistic overlay demo program. + * + * 2009-10-02, Oliver Schmidt (ol.sc@web.de) + * + */ + + + +#include +#include +#include + + +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 (); + } +} diff --git a/src/ld65/cfg/c64-overlay.cfg b/src/ld65/cfg/c64-overlay.cfg new file mode 100644 index 000000000..5995ce28a --- /dev/null +++ b/src/ld65/cfg/c64-overlay.cfg @@ -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__; +} -- 2.39.5