An ISA definition for Kingdom Hearts 2 AI
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73 lines
1.8 KiB
73 lines
1.8 KiB
define space ram type=ram_space size=4 wordsize=1 default;
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define space register type=register_space size=4;
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# this is obviously wrong and will need to be edited when i understand how
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# internal regs are used besides stack
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define register offset=0 size=4 [
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r0 r1 r2 r3 r4 r5 r6
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r7 r8 pc sp ra broken
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];
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define token instr(16)
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opcode = (0, 3)
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ssub_opc = (6, 15)
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sub_opc = (4, 5)
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iarg = (14, 15);
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define token instr_ext(32)
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opcode_ext = (0, 3)
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sub_opc_ext = (4, 5)
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opesub = (6, 7)
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_opesub = (6, 7)
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rn = (6, 7)
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ope3 = (6, 15)
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full_ext = (0, 31)
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full_rel = (0, 31) signed
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# the label thingy
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ope2 = (16, 31)
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_ope2 = (16, 31)
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ope2s = (16, 31) signed;
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# relocated labels
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LABEL8: reloc is ope2s [ reloc = inst_start+(ope2s*2)+4; ] { export *:4 reloc; }
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LABEL02: reloc is ope2s [ reloc = 0x10+(ope2s*2); ] { export *:4 reloc; }
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#LABELV: reloc is full_rel [ reloc = 0x10+(full_rel*2); ] { export *:4 reloc; }
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NOT_LABEL03: reloc is ope2s [ reloc = 0x10+(ope2s*2); ] { tmp:4 = reloc:4; export tmp; }
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#CLABEL: reloc is full_ext [ reloc = 0x10+(full_ext*2); ] { export *:4 reloc; }
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# if i'm not mistaken 0x1da4d8 1 and 2 uses two regs
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# one of them or more is a status reg so i'll have to double check how it's used
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attach variables [ rn ] [ r0 r1 r2 r3 ];
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# exit values
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attach values [ iarg ] [ 1 2 _ _ ];
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define pcodeop system_call;
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define pcodeop fmod;
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define pcodeop exit;
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define pcodeop cos;
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define pcodeop sin;
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define pcodeop radians_to_degrees;
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define pcodeop degrees_to_radians;
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macro push(v) {
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*[ram]:4 sp = v;
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sp = sp + 4;
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}
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macro pop(v) {
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sp = sp - 4;
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v = *[ram]:4 sp;
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}
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macro to_address(v) {
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if(v!=0) goto <address>;
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v=0;
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goto <end>;
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<address>
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v=0x10+(v*2);
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<end>
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}
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