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https://github.com/cc65/cc65.git
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1d1ba3ed3b
The constructors are _NOT_ allowed anymore to access the BSS. Rather they must use the DATA segment or the INIT 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.
46 lines
2.0 KiB
INI
46 lines
2.0 KiB
INI
SYMBOLS {
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__TAPEHDR__: type = import;
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__BASHDR__: type = import;
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__PROGFLAG__: type = weak, value = $00; # $00=BASIC, $80=machine code
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__AUTORUN__: type = weak, value = $00; # $00=only load, $C7=run
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__STACKSIZE__: type = weak, value = $0800; # 2K stack
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__GRAB__: type = weak, value = 0; # 0=don't grab graphics RAM, 1=grab graphics RAM
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__RAMEND__: type = weak, value = $9800 + $1C00 * __GRAB__;
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}
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MEMORY {
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ZP: file = "", define = yes, start = $00E2, size = $001A;
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TAPEHDR: file = %O, type = ro, start = $0000, size = $001F;
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BASHEAD: file = %O, define = yes, start = $0501, size = $000D;
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MAIN: file = %O, define = yes, start = __BASHEAD_LAST__, size = __RAMEND__ - __MAIN_START__ - __STACKSIZE__;
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}
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SEGMENTS {
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ZEROPAGE: load = ZP, type = zp;
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TAPEHDR: load = TAPEHDR, type = ro;
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BASHDR: load = BASHEAD, type = ro, define = yes, optional = yes;
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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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ONCE: load = MAIN, type = ro, optional = yes;
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DATA: load = MAIN, type = rw;
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INIT: load = MAIN, type = rw, optional = yes;
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ZPSAVE1: load = MAIN, type = rw, define = yes; # ZPSAVE1, ZPSAVE2 must be together
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ZPSAVE2: load = MAIN, type = bss; # see "libsrc/atmos/crt0.s"
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BSS: load = MAIN, type = bss, define = 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 = ONCE;
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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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