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Add exehdr
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@ -2,6 +2,16 @@
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SYMBOLS {
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__STACKSIZE__: type = weak, value = $0010; # 16 bytes stack
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__EXEHDR__: type = import;
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__VEC_BOTTOM__: value = $fffa, type = export;
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__VEC_SIZE__: value = $6, type = export;
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__ENCRYPT_BOTTOM__: value = $ff7a, type = export;
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__ENCRYPT_SIZE__: value = $80, type = export;
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__MEMORY_TOP__: value = __ENCRYPT_BOTTOM__, type = export;
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__INIT_SIZE__: value = 69, type = export;
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__MEMORY_INIT__: value = __MEMORY_TOP__ - __INIT_SIZE__, type = export;
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__MEMORY_BOTTOM__: value = $8000, type = export;
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__FREE_ROM_SIZE__: value = __MEMORY_INIT__ - __MEMORY_BOTTOM__, type = export;
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}
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MEMORY {
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@ -10,27 +20,31 @@ MEMORY {
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RAM1: file = "", define = yes, start = $1800, size = $0840, type = rw;
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RAM2: file = "", define = yes, start = $2100, size = $0040, type = rw;
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RAM3: file = "", define = yes, start = $2200, size = $0600, type = rw;
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# For emulators you also need a header file
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HEADER: file = %O, start = $0000, size = 128;
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# "Normal" cartridge rom. Multiple banks arent supported
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# by this script. You may change the rom size, but keep
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# two things in mind:
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# - start must be a multiple of $1000
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# - ROM must end at $ff79
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ROM: file = %O, define = yes, start = $8000, size = $7f7a, type = ro, fill = yes, fillval = $ff;
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ROM: file = %O, define = yes, start = __MEMORY_BOTTOM__, size = __FREE_ROM_SIZE__, type = ro, fill = yes, fillval = $ff;
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ROMS: file = %O, define = yes, start = __MEMORY_INIT__, size = __INIT_SIZE__, type = ro, fill = yes, fillval = $ff;
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# Encryption stuff
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ROME: file = %O, start = $ff7a, size = $80, type = ro, fill = yes, fillval = $ff;
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ROME: file = %O, start = __ENCRYPT_BOTTOM__, size = __ENCRYPT_SIZE__, type = ro, fill = yes, fillval = $ff;
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# Interrupt vectors
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ROMV: file = %O, start = $fffa, size = $6, type = ro, fill = yes, fillval = $ff;
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ROMV: file = %O, start = __VEC_BOTTOM__, size = __VEC_SIZE__, type = ro, fill = yes, fillval = $ff;
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}
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SEGMENTS {
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ZEROPAGE: load = ZP, type = zp;
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STARTUP: load = ROM, type = ro, define = yes;
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ONCE: load = ROM, type = ro, define = yes;
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EXEHDR: load = HEADER, type = ro, define = yes;
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STARTUP: load = ROMS, type = ro, define = yes;
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ONCE: load = ROMS, type = ro, define = yes;
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CODE: load = ROM, type = ro, define = yes;
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RODATA: load = ROM, type = ro, define = yes, align = 256;
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DATA: load = ROM, run = RAM1, type = rw, define = yes;
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BSS: load = RAM1, type = bss, define = yes;
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VECTORS: load = ROM, type = ro, define = yes;
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VECTORS: load = ROMV, type = ro, define = yes;
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ENCRYPTION: load = ROME, type = ro define = yes;
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}
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@ -1,3 +1,10 @@
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;
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; Karri Kaksonen, 2022
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;
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; This header contains data for emulators
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;
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.export __EXEHDR__: absolute = 1
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; ------------------------------------------------------------------------
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; EXE header
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.segment "EXEHDR"
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