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Kicks the work of dealing with ASL/etc into the runtime.

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Thomas Harte 2019-04-09 21:48:08 -04:00
parent f750671f33
commit 7a0319cfe5
1 changed files with 49 additions and 0 deletions
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49
Processors/68000/Implementation/68000Storage.cpp
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@ -918,6 +918,55 @@ struct ProcessorStorageConstructor {
}
} break;
case Decoder::ASLRLSLRROLRROXLRr: {
storage_.instructions[instruction].set_destination(storage_, 0, ea_register);
// All decoding occurs at runtime.
op(Action::PerformOperation);
} break;
case Decoder::ASLRLSLRROLRROXLRm: {
storage_.instructions[instruction].set_destination(storage_, ea_mode, ea_register);
switch(combined_mode(ea_mode, ea_register)) {
default: continue;
case 0x02: // AS(L/R)/LS(L/R)/RO(L/R)/ROX(L/R).w (An)
case 0x03: // AS(L/R)/LS(L/R)/RO(L/R)/ROX(L/R).w (An)+
op(Action::None, seq("nrd np", { a(ea_register) }));
op(Action::PerformOperation, seq("nw", { a(ea_register) }));
if(ea_mode == 0x03) {
op(int(Action::Increment2) | MicroOp::DestinationMask);
}
break;
case 0x04: // AS(L/R)/LS(L/R)/RO(L/R)/ROX(L/R).w -(An)
op(int(Action::Decrement2) | MicroOp::DestinationMask, seq("n nrd np", { a(ea_register) }));
op(Action::PerformOperation, seq("nw", { a(ea_register) }));
break;
case 0x05: // AS(L/R)/LS(L/R)/RO(L/R)/ROX(L/R).w (d16, An)
case 0x06: // AS(L/R)/LS(L/R)/RO(L/R)/ROX(L/R).w (d8, An, Xn)
op( calc_action_for_mode(ea_mode) | MicroOp::DestinationMask,
seq(pseq("np nrd np", ea_mode), { ea(1) }));
op(Action::PerformOperation, seq("nw", { ea(1) }));
break;
case 0x10: // AS(L/R)/LS(L/R)/RO(L/R)/ROX(L/R).w (xxx).w
op( int(Action::AssembleWordAddressFromPrefetch) | MicroOp::DestinationMask,
seq("np nrd np", { ea(1) }));
op(Action::PerformOperation, seq("nw", { ea(1) }));
break;
case 0x11: // AS(L/R)/LS(L/R)/RO(L/R)/ROX(L/R).w (xxx).l
op(Action::None, seq("np"));
op( int(Action::AssembleLongWordAddressFromPrefetch) | MicroOp::DestinationMask,
seq("np nrd np", { ea(1) }));
op(Action::PerformOperation, seq("nw", { ea(1) }));
break;
}
} break;
case Decoder::CLRNEGNEGXNOT: {
const bool is_byte_access = !!((instruction >> 6)&3);
const bool is_long_word_access = ((instruction >> 6)&3) == 2;