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Adapted, to the c64 target, the INIT-segment overlay scheme from the apple2 targets.

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When a program starts running, INIT is moved from one place to another place.  Then, INIT's code is executed; and, the first place is re-used for variables.  After the INIT code has finished, the second place can be re-used by the heap and the C stack.  That means that initiation code and data won't waste any RAM space after they stop being needed.
This commit is contained in:
Greg King
2015-10-05 05:47:43 -04:00
parent 24c2da980b
commit 074e10d288
5 changed files with 200 additions and 104 deletions
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112
cfg/c64-overlay.cfg
View File

@@ -1,64 +1,70 @@
FEATURES {
STARTADDRESS: default = $0801;
}
SYMBOLS {
__LOADADDR__: type = import;
__EXEHDR__: type = import;
__OVERLAYADDR__: type = import;
__STACKSIZE__: type = weak, value = $0800; # 2k stack
__OVERLAYSIZE__: type = weak, value = $1000; # 4k overlay
__STACKSIZE__: type = weak, value = $0800; # 2k stack
__OVERLAYSIZE__: type = weak, value = $1000; # 4k overlay
__HIMEM__: type = weak, value = $D000;
__HIMEM2__: type = export, value = __HIMEM__ - 2;
}
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__;
OVL1ADDR: file = "%O.1", start = $CFFE - __OVERLAYSIZE__, size = $0002;
OVL1: file = "%O.1", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL2ADDR: file = "%O.2", start = $CFFE - __OVERLAYSIZE__, size = $0002;
OVL2: file = "%O.2", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL3ADDR: file = "%O.3", start = $CFFE - __OVERLAYSIZE__, size = $0002;
OVL3: file = "%O.3", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL4ADDR: file = "%O.4", start = $CFFE - __OVERLAYSIZE__, size = $0002;
OVL4: file = "%O.4", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL5ADDR: file = "%O.5", start = $CFFE - __OVERLAYSIZE__, size = $0002;
OVL5: file = "%O.5", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL6ADDR: file = "%O.6", start = $CFFE - __OVERLAYSIZE__, size = $0002;
OVL6: file = "%O.6", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL7ADDR: file = "%O.7", start = $CFFE - __OVERLAYSIZE__, size = $0002;
OVL7: file = "%O.7", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL8ADDR: file = "%O.8", start = $CFFE - __OVERLAYSIZE__, size = $0002;
OVL8: file = "%O.8", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL9ADDR: file = "%O.9", start = $CFFE - __OVERLAYSIZE__, size = $0002;
OVL9: file = "%O.9", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
ZP: file = "", define = yes, start = $0002, size = $001A;
LOADADDR: file = %O, start = %S - 2, size = $0002;
HEADER: file = %O, define = yes, start = %S, size = $000D;
RAM: file = %O, start = __HEADER_LAST__, size = __HIMEM__ - __OVERLAYSIZE__ - __STACKSIZE__ - __HEADER_LAST__;
MOVE: file = %O, start = __ZPSAVE_LOAD__, size = __HIMEM__ - __INIT_RUN__;
OVL1ADDR: file = "%O.1", start = __HIMEM2__ - __OVERLAYSIZE__, size = $0002;
OVL1: file = "%O.1", start = __HIMEM__ - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL2ADDR: file = "%O.2", start = __HIMEM2__ - __OVERLAYSIZE__, size = $0002;
OVL2: file = "%O.2", start = __HIMEM__ - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL3ADDR: file = "%O.3", start = __HIMEM2__ - __OVERLAYSIZE__, size = $0002;
OVL3: file = "%O.3", start = __HIMEM__ - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL4ADDR: file = "%O.4", start = __HIMEM2__ - __OVERLAYSIZE__, size = $0002;
OVL4: file = "%O.4", start = __HIMEM__ - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL5ADDR: file = "%O.5", start = __HIMEM2__ - __OVERLAYSIZE__, size = $0002;
OVL5: file = "%O.5", start = __HIMEM__ - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL6ADDR: file = "%O.6", start = __HIMEM2__ - __OVERLAYSIZE__, size = $0002;
OVL6: file = "%O.6", start = __HIMEM__ - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL7ADDR: file = "%O.7", start = __HIMEM2__ - __OVERLAYSIZE__, size = $0002;
OVL7: file = "%O.7", start = __HIMEM__ - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL8ADDR: file = "%O.8", start = __HIMEM2__ - __OVERLAYSIZE__, size = $0002;
OVL8: file = "%O.8", start = __HIMEM__ - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL9ADDR: file = "%O.9", start = __HIMEM2__ - __OVERLAYSIZE__, size = $0002;
OVL9: file = "%O.9", start = __HIMEM__ - __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;
OVL1ADDR: load = OVL1ADDR, type = ro;
OVERLAY1: load = OVL1, type = ro, define = yes, optional = yes;
OVL2ADDR: load = OVL2ADDR, type = ro;
OVERLAY2: load = OVL2, type = ro, define = yes, optional = yes;
OVL3ADDR: load = OVL3ADDR, type = ro;
OVERLAY3: load = OVL3, type = ro, define = yes, optional = yes;
OVL4ADDR: load = OVL4ADDR, type = ro;
OVERLAY4: load = OVL4, type = ro, define = yes, optional = yes;
OVL5ADDR: load = OVL5ADDR, type = ro;
OVERLAY5: load = OVL5, type = ro, define = yes, optional = yes;
OVL6ADDR: load = OVL6ADDR, type = ro;
OVERLAY6: load = OVL6, type = ro, define = yes, optional = yes;
OVL7ADDR: load = OVL7ADDR, type = ro;
OVERLAY7: load = OVL7, type = ro, define = yes, optional = yes;
OVL8ADDR: load = OVL8ADDR, type = ro;
OVERLAY8: load = OVL8, type = ro, define = yes, optional = yes;
OVL9ADDR: load = OVL9ADDR, type = ro;
OVERLAY9: load = OVL9, type = ro, define = yes, optional = yes;
ZEROPAGE: load = ZP, type = zp;
LOADADDR: load = LOADADDR, type = ro;
EXEHDR: load = HEADER, type = ro;
STARTUP: load = RAM, type = ro;
LOWCODE: load = RAM, type = ro, optional = yes;
CODE: load = RAM, type = ro;
RODATA: load = RAM, type = ro;
DATA: load = RAM, type = rw;
ZPSAVE: load = RAM, type = bss, define = yes;
BSS: load = RAM, type = bss, define = yes;
INIT: load = MOVE, run = RAM, type = ro, define = yes, optional = yes;
OVL1ADDR: load = OVL1ADDR, type = ro;
OVERLAY1: load = OVL1, type = ro, define = yes, optional = yes;
OVL2ADDR: load = OVL2ADDR, type = ro;
OVERLAY2: load = OVL2, type = ro, define = yes, optional = yes;
OVL3ADDR: load = OVL3ADDR, type = ro;
OVERLAY3: load = OVL3, type = ro, define = yes, optional = yes;
OVL4ADDR: load = OVL4ADDR, type = ro;
OVERLAY4: load = OVL4, type = ro, define = yes, optional = yes;
OVL5ADDR: load = OVL5ADDR, type = ro;
OVERLAY5: load = OVL5, type = ro, define = yes, optional = yes;
OVL6ADDR: load = OVL6ADDR, type = ro;
OVERLAY6: load = OVL6, type = ro, define = yes, optional = yes;
OVL7ADDR: load = OVL7ADDR, type = ro;
OVERLAY7: load = OVL7, type = ro, define = yes, optional = yes;
OVL8ADDR: load = OVL8ADDR, type = ro;
OVERLAY8: load = OVL8, type = ro, define = yes, optional = yes;
OVL9ADDR: load = OVL9ADDR, type = ro;
OVERLAY9: load = OVL9, type = ro, define = yes, optional = yes;
}
FEATURES {
CONDES: type = constructor,

35
cfg/c64.cfg
View File

@@ -1,26 +1,31 @@
FEATURES {
STARTADDRESS: default = $0801;
}
SYMBOLS {
__LOADADDR__: type = import;
__EXEHDR__: type = import;
__STACKSIZE__: type = weak, value = $0800; # 2k stack
__HIMEM__: type = weak, value = $D000;
}
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 - __STACKSIZE__;
ZP: file = "", define = yes, start = $0002, size = $001A;
LOADADDR: file = %O, start = %S - 2, size = $0002;
HEADER: file = %O, define = yes, start = %S, size = $000D;
RAM: file = %O, start = __HEADER_LAST__, size = __HIMEM__ - __STACKSIZE__ - __HEADER_LAST__;
MOVE: file = %O, start = __ZPSAVE_LOAD__, size = __HIMEM__ - __INIT_RUN__;
}
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;
ZEROPAGE: load = ZP, type = zp;
LOADADDR: load = LOADADDR, type = ro;
EXEHDR: load = HEADER, type = ro;
STARTUP: load = RAM, type = ro;
LOWCODE: load = RAM, type = ro, optional = yes;
CODE: load = RAM, type = ro;
RODATA: load = RAM, type = ro;
DATA: load = RAM, type = rw;
ZPSAVE: load = RAM, type = bss, define = yes;
BSS: load = RAM, type = bss, define = yes;
INIT: load = MOVE, run = RAM, type = ro, define = yes, optional = yes;
}
FEATURES {
CONDES: type = constructor,