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T16: Implement {LDR,STR}{,B,H} (immediate)

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merry 2022-02-10 23:03:00 +00:00
parent d3272c1498
commit f3e068b94a
2 changed files with 63 additions and 0 deletions
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57
ARMeilleure/Decoders/OpCodeT16MemImm5.cs Normal file
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@ -0,0 +1,57 @@
using ARMeilleure.Instructions;
namespace ARMeilleure.Decoders
{
class OpCodeT16MemImm5 : OpCodeT16, IOpCode32Mem
{
public int Rt { get; }
public int Rn { get; }
public bool WBack => false;
public bool IsLoad { get; }
public bool Index => true;
public bool Add => true;
public int Immediate { get; }
public new static OpCode Create(InstDescriptor inst, ulong address, int opCode, bool inITBlock) => new OpCodeT16MemImm5(inst, address, opCode, inITBlock);
public OpCodeT16MemImm5(InstDescriptor inst, ulong address, int opCode, bool inITBlock) : base(inst, address, opCode, inITBlock)
{
Rt = (opCode >> 0) & 7;
Rn = (opCode >> 3) & 7;
switch (inst.Name)
{
case InstName.Ldr:
case InstName.Ldrb:
case InstName.Ldrh:
IsLoad = true;
break;
case InstName.Str:
case InstName.Strb:
case InstName.Strh:
IsLoad = false;
break;
}
switch (inst.Name)
{
case InstName.Str:
case InstName.Ldr:
Immediate = ((opCode >> 6) & 0x1f) << 2;
break;
case InstName.Strb:
case InstName.Ldrb:
Immediate = ((opCode >> 6) & 0x1f);
break;
case InstName.Strh:
case InstName.Ldrh:
Immediate = ((opCode >> 6) & 0x1f) << 1;
break;
default:
throw new System.InvalidOperationException();
}
}
}
}

6
ARMeilleure/Decoders/OpCodeTable.cs
View file

@ -1013,6 +1013,12 @@ namespace ARMeilleure.Decoders
SetT16("0101101xxxxxxxxx", InstName.Ldrh, InstEmit32.Ldrh, OpCodeT16MemReg.Create);
SetT16("0101110xxxxxxxxx", InstName.Ldrb, InstEmit32.Ldrb, OpCodeT16MemReg.Create);
SetT16("0101111xxxxxxxxx", InstName.Ldrsh, InstEmit32.Ldrsh, OpCodeT16MemReg.Create);
SetT16("01100xxxxxxxxxxx", InstName.Str, InstEmit32.Str, OpCodeT16MemImm5.Create);
SetT16("01101xxxxxxxxxxx", InstName.Ldr, InstEmit32.Ldr, OpCodeT16MemImm5.Create);
SetT16("01110xxxxxxxxxxx", InstName.Strb, InstEmit32.Strb, OpCodeT16MemImm5.Create);
SetT16("01111xxxxxxxxxxx", InstName.Ldrb, InstEmit32.Ldrb, OpCodeT16MemImm5.Create);
SetT16("10000xxxxxxxxxxx", InstName.Strh, InstEmit32.Strh, OpCodeT16MemImm5.Create);
SetT16("10001xxxxxxxxxxx", InstName.Ldrh, InstEmit32.Ldrh, OpCodeT16MemImm5.Create);
#endregion
FillFastLookupTable(InstA32FastLookup, AllInstA32, ToFastLookupIndexA);