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https://github.com/cc65/cc65.git
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0ee9b2e446
So far the INIT segment was run from the later heap+stack. Now the INIT segment is run from the later BSS. The background is that so far the INIT segment was pretty small (from $80 to $180 bytes). But upcoming changes will increase the INIT segment in certain scenarios up to ~ $1000 bytes. So programs with very limited heap+stack might just not been able to move the INIT segment to its run location. But moving the INIT segment to the later BSS allows it to occupy the later BSS+heap+stack. In order to allow that the constructors are _NOT_ allowed anymore to access the BSS. Rather they must use the DATA segment or the new INITBSS segment. The latter isn't cleared at any point so the constructors may use it to expose values to the main program. However they must make sure to always write the values as they are not pre-initialized.
85 lines
4.8 KiB
INI
85 lines
4.8 KiB
INI
FEATURES {
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STARTADDRESS: default = $0801;
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}
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SYMBOLS {
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__LOADADDR__: type = import;
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__EXEHDR__: type = import;
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__OVERLAYADDR__: 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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__HIMEM__: type = weak, value = $D000;
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__OVERLAYSTART__: type = export, value = __HIMEM__ - __OVERLAYSIZE__;
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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 = %S - 2, size = $0002;
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HEADER: file = %O, define = yes, start = %S, size = $000D;
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MAIN: file = %O, define = yes, start = __HEADER_LAST__, size = __OVERLAYSTART__ - __STACKSIZE__ - __HEADER_LAST__;
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MOVE: file = %O, start = __INITBSS_LOAD__, size = __HIMEM__ - __BSS_RUN__;
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INIT: file = "", start = __BSS_RUN__, size = __HIMEM__ - __BSS_RUN__;
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OVL1ADDR: file = "%O.1", start = __OVERLAYSTART__ - 2, size = $0002;
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OVL1: file = "%O.1", start = __OVERLAYSTART__, size = __OVERLAYSIZE__;
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OVL2ADDR: file = "%O.2", start = __OVERLAYSTART__ - 2, size = $0002;
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OVL2: file = "%O.2", start = __OVERLAYSTART__, size = __OVERLAYSIZE__;
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OVL3ADDR: file = "%O.3", start = __OVERLAYSTART__ - 2, size = $0002;
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OVL3: file = "%O.3", start = __OVERLAYSTART__, size = __OVERLAYSIZE__;
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OVL4ADDR: file = "%O.4", start = __OVERLAYSTART__ - 2, size = $0002;
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OVL4: file = "%O.4", start = __OVERLAYSTART__, size = __OVERLAYSIZE__;
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OVL5ADDR: file = "%O.5", start = __OVERLAYSTART__ - 2, size = $0002;
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OVL5: file = "%O.5", start = __OVERLAYSTART__, size = __OVERLAYSIZE__;
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OVL6ADDR: file = "%O.6", start = __OVERLAYSTART__ - 2, size = $0002;
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OVL6: file = "%O.6", start = __OVERLAYSTART__, size = __OVERLAYSIZE__;
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OVL7ADDR: file = "%O.7", start = __OVERLAYSTART__ - 2, size = $0002;
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OVL7: file = "%O.7", start = __OVERLAYSTART__, size = __OVERLAYSIZE__;
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OVL8ADDR: file = "%O.8", start = __OVERLAYSTART__ - 2, size = $0002;
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OVL8: file = "%O.8", start = __OVERLAYSTART__, size = __OVERLAYSIZE__;
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OVL9ADDR: file = "%O.9", start = __OVERLAYSTART__ - 2, size = $0002;
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OVL9: file = "%O.9", start = __OVERLAYSTART__, size = __OVERLAYSIZE__;
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}
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SEGMENTS {
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ZEROPAGE: load = ZP, type = zp;
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LOADADDR: load = LOADADDR, type = ro;
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EXEHDR: load = HEADER, type = ro;
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STARTUP: load = MAIN, type = ro;
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LOWCODE: load = MAIN, type = ro, optional = yes;
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CODE: load = MAIN, type = ro;
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RODATA: load = MAIN, type = ro;
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DATA: load = MAIN, type = rw;
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INITBSS: load = MAIN, type = bss, define = yes;
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BSS: load = MAIN, type = bss, define = yes;
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INIT: load = MOVE, run = INIT, type = ro, define = yes;
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OVL1ADDR: load = OVL1ADDR, type = ro;
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OVERLAY1: load = OVL1, type = ro, define = yes, optional = yes;
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OVL2ADDR: load = OVL2ADDR, type = ro;
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OVERLAY2: load = OVL2, type = ro, define = yes, optional = yes;
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OVL3ADDR: load = OVL3ADDR, type = ro;
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OVERLAY3: load = OVL3, type = ro, define = yes, optional = yes;
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OVL4ADDR: load = OVL4ADDR, type = ro;
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OVERLAY4: load = OVL4, type = ro, define = yes, optional = yes;
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OVL5ADDR: load = OVL5ADDR, type = ro;
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OVERLAY5: load = OVL5, type = ro, define = yes, optional = yes;
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OVL6ADDR: load = OVL6ADDR, type = ro;
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OVERLAY6: load = OVL6, type = ro, define = yes, optional = yes;
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OVL7ADDR: load = OVL7ADDR, type = ro;
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OVERLAY7: load = OVL7, type = ro, define = yes, optional = yes;
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OVL8ADDR: load = OVL8ADDR, type = ro;
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OVERLAY8: load = OVL8, type = ro, define = yes, optional = yes;
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OVL9ADDR: load = OVL9ADDR, type = ro;
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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: type = constructor,
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label = __CONSTRUCTOR_TABLE__,
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count = __CONSTRUCTOR_COUNT__,
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segment = INIT;
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CONDES: type = destructor,
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label = __DESTRUCTOR_TABLE__,
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count = __DESTRUCTOR_COUNT__,
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segment = RODATA;
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CONDES: type = interruptor,
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label = __INTERRUPTOR_TABLE__,
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count = __INTERRUPTOR_COUNT__,
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segment = RODATA,
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import = __CALLIRQ__;
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}
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