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https://github.com/cc65/cc65.git
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1cc4fa9356
Extendend memory is mapped over the main memory in the 0x4000..0x7FFF area. Many DOSes disable interrupts while extended memory is banked in, but not all (e.g. SpartaDOS-X). This change modifies the initial interrupt handler to map in main memory before chaining to the "worker" handlers. Since the initial interrupt handler uses a data segment to store the trampoline to chain to the original handler, introduce a new "LOWBSS" segment to hold this trampoline. Otherwise the trampoline may end up inside the 0x4000..0x7FFF area. Add a link time warning if "LOWCODE" segment lays within the extended memory window.
110 lines
6.3 KiB
INI
110 lines
6.3 KiB
INI
FEATURES {
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STARTADDRESS: default = $2400;
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}
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SYMBOLS {
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__EXEHDR__: type = import;
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__SYSTEM_CHECK__: type = import; # force inclusion of "system check" load chunk
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__AUTOSTART__: type = import; # force inclusion of autostart "trailer"
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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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__STARTADDRESS__: type = export, value = %S;
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}
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MEMORY {
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ZP: file = "", define = yes, start = $0082, size = $007E;
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# just $FFFF
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HEADER: file = %O, start = $0000, size = $0002;
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# "system check" load chunk
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SYSCHKHDR: file = %O, start = $0000, size = $0004;
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SYSCHKCHNK: file = %O, start = $2E00, size = $0300;
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SYSCHKTRL: file = %O, start = $0000, size = $0006;
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# "shadow RAM preparation" load chunk
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SRPREPHDR: file = %O, start = $0000, size = $0004;
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SRPREPCHNK: file = %O, define = yes, start = %S + __OVERLAYSIZE__, size = $7C20 - %S - __OVERLAYSIZE__ - $07FF; # $07FF: space for temp. chargen buffer, 1K aligned
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SRPREPTRL: file = %O, start = $0000, size = $0006;
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# "main program" load chunk
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MAINHDR: file = %O, start = $0000, size = $0004;
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MAIN: file = %O, define = yes, start = %S + __OVERLAYSIZE__ +
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__LOWBSS_SIZE__, size = $D000 - __STACKSIZE__ - %S - __OVERLAYSIZE__ - __LOWBSS_SIZE__;
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# defines entry point into program
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TRAILER: file = %O, start = $0000, size = $0006;
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# memory beneath the ROM preceeding the character generator
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HIDDEN_RAM2: file = "", define = yes, start = $D800, size = $0800;
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# address of relocated character generator (same addess as ROM version)
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CHARGEN: file = "", define = yes, start = $E000, size = $0400;
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# memory beneath the ROM
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HIDDEN_RAM: file = "", define = yes, start = $E400, size = $FFFA - $E400;
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# overlays
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OVL1: file = "%O.1", start = %S, size = __OVERLAYSIZE__;
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OVL2: file = "%O.2", start = %S, size = __OVERLAYSIZE__;
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OVL3: file = "%O.3", start = %S, size = __OVERLAYSIZE__;
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OVL4: file = "%O.4", start = %S, size = __OVERLAYSIZE__;
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OVL5: file = "%O.5", start = %S, size = __OVERLAYSIZE__;
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OVL6: file = "%O.6", start = %S, size = __OVERLAYSIZE__;
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OVL7: file = "%O.7", start = %S, size = __OVERLAYSIZE__;
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OVL8: file = "%O.8", start = %S, size = __OVERLAYSIZE__;
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OVL9: file = "%O.9", start = %S, size = __OVERLAYSIZE__;
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}
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SEGMENTS {
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ZEROPAGE: load = ZP, type = zp;
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EXTZP: load = ZP, type = zp, optional = yes;
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EXEHDR: load = HEADER, type = ro;
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SYSCHKHDR: load = SYSCHKHDR, type = ro, optional = yes;
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SYSCHK: load = SYSCHKCHNK, type = rw, define = yes, optional = yes;
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SYSCHKTRL: load = SYSCHKTRL, type = ro, optional = yes;
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SRPREPHDR: load = SRPREPHDR, type = ro;
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LOWBSS: load = SRPREPCHNK, type = bss, define = yes; # shared btw. SRPREPCHNK and RAM, not zero initialized
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SRPREP: load = SRPREPCHNK, type = rw, define = yes;
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SHADOW_RAM: load = SRPREPCHNK, run = HIDDEN_RAM, type = rw, define = yes, optional = yes;
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SHADOW_RAM2: load = SRPREPCHNK, run = HIDDEN_RAM2, type = rw, define = yes, optional = yes;
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SRPREPTRL: load = SRPREPTRL, type = ro;
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MAINHDR: load = MAINHDR, type = ro;
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STARTUP: load = MAIN, type = ro, define = yes;
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LOWBSS: load = MAIN, type = rw, optional = yes; # not zero-initialized
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LOWCODE: load = MAIN, type = ro, define = yes, optional = yes;
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ONCE: load = MAIN, type = ro, optional = yes;
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CODE: load = MAIN, type = ro, define = yes;
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RODATA: load = MAIN, type = ro;
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DATA: load = MAIN, type = rw;
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INIT: load = MAIN, type = rw, optional = yes;
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BSS: load = MAIN, type = bss, define = yes;
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AUTOSTRT: load = TRAILER, type = ro;
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OVERLAY1: load = OVL1, type = ro, define = yes, optional = yes;
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OVERLAY2: load = OVL2, type = ro, define = yes, optional = yes;
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OVERLAY3: load = OVL3, type = ro, define = yes, optional = yes;
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OVERLAY4: load = OVL4, type = ro, define = yes, optional = yes;
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OVERLAY5: load = OVL5, type = ro, define = yes, optional = yes;
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OVERLAY6: load = OVL6, type = ro, define = yes, optional = yes;
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OVERLAY7: load = OVL7, type = ro, define = yes, optional = yes;
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OVERLAY8: load = OVL8, type = ro, define = yes, optional = yes;
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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 = 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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