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Implement some ARM32 memory instructions and CMP (#565) 

* Implement ARM32 memory instructions: LDM, LDR, LDRB, LDRD, LDRH, LDRSB, LDRSH, STM, STR, STRB, STRD, STRH (immediate and register + immediate variants), implement CMP (immediate and register shifted by immediate variants)

* Rename some opcode classes and flag masks for consistency

* Fix a few suboptimal ARM32 codegen issues, only loads should be considered on decoder when checking if Rt == PC, and only NZCV flags should be considered for comparison optimizations

* Take into account Rt2 for LDRD instructions aswell when checking if the instruction changes PC

* Re-align arm32 instructions on the opcode table
This commit is contained in:
gdkchan 2019-01-29 13:06:11 -03:00 committed by GitHub
parent 64a12b8eb5
commit 0cda6b3cdf
28 changed files with 674 additions and 85 deletions
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56
Decoders/Decoder.cs
View File

@ -168,9 +168,59 @@ namespace ChocolArm64.Decoders
{
//Note: On ARM32, most ALU operations can write to R15 (PC),
//so we must consider such operations as a branch in potential aswell.
return opCode is IOpCodeBImm32 ||
opCode is IOpCodeBReg32 ||
(opCode is IOpCodeAlu32 op && op.Rd == RegisterAlias.Aarch32Pc);
if (opCode is IOpCode32Alu opAlu && opAlu.Rd == RegisterAlias.Aarch32Pc)
{
return true;
}
//Same thing for memory operations. We have the cases where PC is a target
//register (Rt == 15 or (mask & (1 << 15)) != 0), and cases where there is
//a write back to PC (wback == true && Rn == 15), however the later may
//be "undefined" depending on the CPU, so compilers should not produce that.
if (opCode is IOpCode32Mem || opCode is IOpCode32MemMult)
{
int rt, rn;
bool wBack, isLoad;
if (opCode is IOpCode32Mem opMem)
{
rt = opMem.Rt;
rn = opMem.Rn;
wBack = opMem.WBack;
isLoad = opMem.IsLoad;
//For the dual load, we also need to take into account the
//case were Rt2 == 15 (PC).
if (rt == 14 && opMem.Emitter == InstEmit32.Ldrd)
{
rt = RegisterAlias.Aarch32Pc;
}
}
else if (opCode is IOpCode32MemMult opMemMult)
{
const int pcMask = 1 << RegisterAlias.Aarch32Pc;
rt = (opMemMult.RegisterMask & pcMask) != 0 ? RegisterAlias.Aarch32Pc : 0;
rn = opMemMult.Rn;
wBack = opMemMult.PostOffset != 0;
isLoad = opMemMult.IsLoad;
}
else
{
throw new NotImplementedException($"The type \"{opCode.GetType().Name}\" is not implemented on the decoder.");
}
if ((rt == RegisterAlias.Aarch32Pc && isLoad) ||
(rn == RegisterAlias.Aarch32Pc && wBack))
{
return true;
}
}
//Explicit branch instructions.
return opCode is IOpCode32BImm ||
opCode is IOpCode32BReg;
}
private static bool IsException(OpCode64 opCode)

2
Decoders/IOpCodeAlu32.cs → Decoders/IOpCode32Alu.cs
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@ -1,6 +1,6 @@
namespace ChocolArm64.Decoders
{
interface IOpCodeAlu32 : IOpCode32
interface IOpCode32Alu : IOpCode32
{
int Rd { get; }
int Rn { get; }

4
Decoders/IOpCode32BImm.cs Normal file
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@ -0,0 +1,4 @@
namespace ChocolArm64.Decoders
{
interface IOpCode32BImm : IOpCode32, IOpCodeBImm { }
}

2
Decoders/IOpCodeBReg32.cs → Decoders/IOpCode32BReg.cs
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@ -1,6 +1,6 @@
namespace ChocolArm64.Decoders
{
interface IOpCodeBReg32 : IOpCode32
interface IOpCode32BReg : IOpCode32
{
int Rm { get; }
}

12
Decoders/IOpCode32Mem.cs Normal file
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@ -0,0 +1,12 @@
namespace ChocolArm64.Decoders
{
interface IOpCode32Mem : IOpCode32
{
int Rt { get; }
int Rn { get; }
bool WBack { get; }
bool IsLoad { get; }
}
}

13
Decoders/IOpCode32MemMult.cs Normal file
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@ -0,0 +1,13 @@
namespace ChocolArm64.Decoders
{
interface IOpCode32MemMult : IOpCode32
{
int Rn { get; }
int RegisterMask { get; }
int PostOffset { get; }
bool IsLoad { get; }
}
}

4
Decoders/IOpCodeBImm32.cs
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@ -1,4 +0,0 @@
namespace ChocolArm64.Decoders
{
interface IOpCodeBImm32 : IOpCode32, IOpCodeBImm { }
}

4
Decoders/OpCodeAlu32.cs → Decoders/OpCode32Alu.cs
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@ -2,14 +2,14 @@ using ChocolArm64.Instructions;
namespace ChocolArm64.Decoders
{
class OpCodeAlu32 : OpCode32, IOpCodeAlu32
class OpCode32Alu : OpCode32, IOpCode32Alu
{
public int Rd { get; private set; }
public int Rn { get; private set; }
public bool SetFlags { get; private set; }
public OpCodeAlu32(Inst inst, long position, int opCode) : base(inst, position, opCode)
public OpCode32Alu(Inst inst, long position, int opCode) : base(inst, position, opCode)
{
Rd = (opCode >> 12) & 0xf;
Rn = (opCode >> 16) & 0xf;

4
Decoders/OpCodeAluImm32.cs → Decoders/OpCode32AluImm.cs
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@ -2,13 +2,13 @@ using ChocolArm64.Instructions;
namespace ChocolArm64.Decoders
{
class OpCodeAluImm32 : OpCodeAlu32
class OpCode32AluImm : OpCode32Alu
{
public int Imm { get; private set; }
public bool IsRotated { get; private set; }
public OpCodeAluImm32(Inst inst, long position, int opCode) : base(inst, position, opCode)
public OpCode32AluImm(Inst inst, long position, int opCode) : base(inst, position, opCode)
{
int value = (opCode >> 0) & 0xff;
int shift = (opCode >> 8) & 0xf;

4
Decoders/OpCodeAluRsImm32.cs → Decoders/OpCode32AluRsImm.cs
View File

@ -2,14 +2,14 @@ using ChocolArm64.Instructions;
namespace ChocolArm64.Decoders
{
class OpCodeAluRsImm32 : OpCodeAlu32
class OpCode32AluRsImm : OpCode32Alu
{
public int Rm { get; private set; }
public int Imm { get; private set; }
public ShiftType ShiftType { get; private set; }
public OpCodeAluRsImm32(Inst inst, long position, int opCode) : base(inst, position, opCode)
public OpCode32AluRsImm(Inst inst, long position, int opCode) : base(inst, position, opCode)
{
Rm = (opCode >> 0) & 0xf;
Imm = (opCode >> 7) & 0x1f;

4
Decoders/OpCodeBImm32.cs → Decoders/OpCode32BImm.cs
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@ -2,11 +2,11 @@ using ChocolArm64.Instructions;
namespace ChocolArm64.Decoders
{
class OpCodeBImm32 : OpCode32, IOpCodeBImm32
class OpCode32BImm : OpCode32, IOpCode32BImm
{
public long Imm { get; private set; }
public OpCodeBImm32(Inst inst, long position, int opCode) : base(inst, position, opCode)
public OpCode32BImm(Inst inst, long position, int opCode) : base(inst, position, opCode)
{
uint pc = GetPc();

4
Decoders/OpCodeBReg32.cs → Decoders/OpCode32BReg.cs
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@ -2,11 +2,11 @@ using ChocolArm64.Instructions;
namespace ChocolArm64.Decoders
{
class OpCodeBReg32 : OpCode32, IOpCodeBReg32
class OpCode32BReg : OpCode32, IOpCode32BReg
{
public int Rm { get; private set; }
public OpCodeBReg32(Inst inst, long position, int opCode) : base(inst, position, opCode)
public OpCode32BReg(Inst inst, long position, int opCode) : base(inst, position, opCode)
{
Rm = opCode & 0xf;
}

37
Decoders/OpCode32Mem.cs Normal file
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@ -0,0 +1,37 @@
using ChocolArm64.Instructions;
namespace ChocolArm64.Decoders
{
class OpCode32Mem : OpCode32, IOpCode32Mem
{
public int Rt { get; private set; }
public int Rn { get; private set; }
public int Imm { get; protected set; }
public bool Index { get; private set; }
public bool Add { get; private set; }
public bool WBack { get; private set; }
public bool Unprivileged { get; private set; }
public bool IsLoad { get; private set; }
public OpCode32Mem(Inst inst, long position, int opCode) : base(inst, position, opCode)
{
Rt = (opCode >> 12) & 0xf;
Rn = (opCode >> 16) & 0xf;
bool isLoad = (opCode & (1 << 20)) != 0;
bool w = (opCode & (1 << 21)) != 0;
bool u = (opCode & (1 << 23)) != 0;
bool p = (opCode & (1 << 24)) != 0;
Index = p;
Add = u;
WBack = !p || w;
Unprivileged = !p && w;
IsLoad = isLoad || inst.Emitter == InstEmit32.Ldrd;
}
}
}

12
Decoders/OpCode32MemImm.cs Normal file
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@ -0,0 +1,12 @@
using ChocolArm64.Instructions;
namespace ChocolArm64.Decoders
{
class OpCode32MemImm : OpCode32Mem
{
public OpCode32MemImm(Inst inst, long position, int opCode) : base(inst, position, opCode)
{
Imm = opCode & 0xfff;
}
}
}

15
Decoders/OpCode32MemImm8.cs Normal file
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@ -0,0 +1,15 @@
using ChocolArm64.Instructions;
namespace ChocolArm64.Decoders
{
class OpCode32MemImm8 : OpCode32Mem
{
public OpCode32MemImm8(Inst inst, long position, int opCode) : base(inst, position, opCode)
{
int imm4L = (opCode >> 0) & 0xf;
int imm4H = (opCode >> 8) & 0xf;
Imm = imm4L | (imm4H << 4);
}
}
}

57
Decoders/OpCode32MemMult.cs Normal file
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@ -0,0 +1,57 @@
using ChocolArm64.Instructions;
namespace ChocolArm64.Decoders
{
class OpCode32MemMult : OpCode32, IOpCode32MemMult
{
public int Rn { get; private set; }
public int RegisterMask { get; private set; }
public int Offset { get; private set; }
public int PostOffset { get; private set; }
public bool IsLoad { get; private set; }
public OpCode32MemMult(Inst inst, long position, int opCode) : base(inst, position, opCode)
{
Rn = (opCode >> 16) & 0xf;
bool isLoad = (opCode & (1 << 20)) != 0;
bool w = (opCode & (1 << 21)) != 0;
bool u = (opCode & (1 << 23)) != 0;
bool p = (opCode & (1 << 24)) != 0;
RegisterMask = opCode & 0xffff;
int regsSize = 0;
for (int index = 0; index < 16; index++)
{
regsSize += (RegisterMask >> index) & 1;
}
regsSize *= 4;
if (!u)
{
Offset -= regsSize;
}
if (u == p)
{
Offset += 4;
}
if (w)
{
PostOffset = u ? regsSize : -regsSize;
}
else
{
PostOffset = 0;
}
IsLoad = isLoad;
}
}
}

4
Decoders/OpCodeAluImm8T16.cs → Decoders/OpCodeT16AluImm8.cs
View File

@ -2,7 +2,7 @@ using ChocolArm64.Instructions;
namespace ChocolArm64.Decoders
{
class OpCodeAluImm8T16 : OpCodeT16, IOpCodeAlu32
class OpCodeT16AluImm8 : OpCodeT16, IOpCode32Alu
{
private int _rdn;
@ -13,7 +13,7 @@ namespace ChocolArm64.Decoders
public int Imm { get; private set; }
public OpCodeAluImm8T16(Inst inst, long position, int opCode) : base(inst, position, opCode)
public OpCodeT16AluImm8(Inst inst, long position, int opCode) : base(inst, position, opCode)
{
Imm = (opCode >> 0) & 0xff;
_rdn = (opCode >> 8) & 0x7;

4
Decoders/OpCodeBRegT16.cs → Decoders/OpCodeT16BReg.cs
View File

@ -2,11 +2,11 @@ using ChocolArm64.Instructions;
namespace ChocolArm64.Decoders
{
class OpCodeBRegT16 : OpCodeT16, IOpCodeBReg32
class OpCodeT16BReg : OpCodeT16, IOpCode32BReg
{
public int Rm { get; private set; }
public OpCodeBRegT16(Inst inst, long position, int opCode) : base(inst, position, opCode)
public OpCodeT16BReg(Inst inst, long position, int opCode) : base(inst, position, opCode)
{
Rm = (opCode >> 3) & 0xf;
}

46
Instructions/InstEmit32Helper.cs
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@ -2,6 +2,7 @@ using ChocolArm64.Decoders;
using ChocolArm64.State;
using ChocolArm64.Translation;
using System;
using System.Reflection.Emit;
namespace ChocolArm64.Instructions
{
@ -26,6 +27,51 @@ namespace ChocolArm64.Instructions
}
}
public static void EmitStoreToRegister(ILEmitterCtx context, int register)
{
if (register == RegisterAlias.Aarch32Pc)
{
context.EmitStoreState();
EmitBxWritePc(context);
}
else
{
context.EmitStint(GetRegisterAlias(context.Mode, register));
}
}
public static void EmitBxWritePc(ILEmitterCtx context)
{
context.Emit(OpCodes.Dup);
context.EmitLdc_I4(1);
context.Emit(OpCodes.And);
context.Emit(OpCodes.Dup);
context.EmitStflg((int)PState.TBit);
ILLabel lblArmMode = new ILLabel();
ILLabel lblEnd = new ILLabel();
context.Emit(OpCodes.Brtrue_S, lblArmMode);
context.EmitLdc_I4(~1);
context.Emit(OpCodes.Br_S, lblEnd);
context.MarkLabel(lblArmMode);
context.EmitLdc_I4(~3);
context.MarkLabel(lblEnd);
context.Emit(OpCodes.And);
context.Emit(OpCodes.Conv_U8);
context.Emit(OpCodes.Ret);
}
public static int GetRegisterAlias(Aarch32Mode mode, int register)
{
//Only registers >= 8 are banked, with registers in the range [8, 12] being

26
Instructions/InstEmitAlu32.cs
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@ -12,7 +12,7 @@ namespace ChocolArm64.Instructions
{
public static void Add(ILEmitterCtx context)
{
IOpCodeAlu32 op = (IOpCodeAlu32)context.CurrOp;
IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
EmitAluLoadOpers(context, setCarry: false);
@ -29,9 +29,25 @@ namespace ChocolArm64.Instructions
EmitAluStore(context);
}
public static void Cmp(ILEmitterCtx context)
{
IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
EmitAluLoadOpers(context, setCarry: false);
context.Emit(OpCodes.Sub);
context.EmitZnFlagCheck();
EmitSubsCCheck(context);
EmitSubsVCheck(context);
context.Emit(OpCodes.Pop);
}
public static void Mov(ILEmitterCtx context)
{
IOpCodeAlu32 op = (IOpCodeAlu32)context.CurrOp;
IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
EmitAluLoadOper2(context);
@ -45,7 +61,7 @@ namespace ChocolArm64.Instructions
public static void Sub(ILEmitterCtx context)
{
IOpCodeAlu32 op = (IOpCodeAlu32)context.CurrOp;
IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
EmitAluLoadOpers(context, setCarry: false);
@ -64,7 +80,7 @@ namespace ChocolArm64.Instructions
private static void EmitAluStore(ILEmitterCtx context)
{
IOpCodeAlu32 op = (IOpCodeAlu32)context.CurrOp;
IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
if (op.Rd == RegisterAlias.Aarch32Pc)
{
@ -106,6 +122,8 @@ namespace ChocolArm64.Instructions
private static void EmitAluWritePc(ILEmitterCtx context)
{
context.EmitStoreState();
if (IsThumb(context.CurrOp))
{
context.EmitLdc_I4(~1);

12
Instructions/InstEmitAluHelper.cs
View File

@ -127,7 +127,7 @@ namespace ChocolArm64.Instructions
{
context.EmitLdintzr(op.Rm);
}
else if (context.CurrOp is OpCodeAluRsImm32 op32)
else if (context.CurrOp is OpCode32AluRsImm op32)
{
InstEmit32Helper.EmitLoadFromRegister(context, op32.Rm);
}
@ -156,7 +156,7 @@ namespace ChocolArm64.Instructions
context.EmitLdint(op.Rn);
}
}
else if (context.CurrOp is IOpCodeAlu32 op32)
else if (context.CurrOp is IOpCode32Alu op32)
{
InstEmit32Helper.EmitLoadFromRegister(context, op32.Rn);
}
@ -171,7 +171,7 @@ namespace ChocolArm64.Instructions
switch (context.CurrOp)
{
//ARM32.
case OpCodeAluImm32 op:
case OpCode32AluImm op:
context.EmitLdc_I4(op.Imm);
if (op.SetFlags && op.IsRotated)
@ -182,11 +182,11 @@ namespace ChocolArm64.Instructions
}
break;
case OpCodeAluRsImm32 op:
case OpCode32AluRsImm op:
EmitLoadRmShiftedByImmediate(context, op, setCarry);
break;
case OpCodeAluImm8T16 op:
case OpCodeT16AluImm8 op:
context.EmitLdc_I4(op.Imm);
break;
@ -246,7 +246,7 @@ namespace ChocolArm64.Instructions
}
//ARM32 helpers.
private static void EmitLoadRmShiftedByImmediate(ILEmitterCtx context, OpCodeAluRsImm32 op, bool setCarry)
private static void EmitLoadRmShiftedByImmediate(ILEmitterCtx context, OpCode32AluRsImm op, bool setCarry)
{
int shift = op.Imm;

23
Instructions/InstEmitFlow32.cs
View File

@ -11,7 +11,7 @@ namespace ChocolArm64.Instructions
{
public static void B(ILEmitterCtx context)
{
IOpCodeBImm32 op = (IOpCodeBImm32)context.CurrOp;
IOpCode32BImm op = (IOpCode32BImm)context.CurrOp;
if (context.CurrBlock.Branch != null)
{
@ -38,7 +38,7 @@ namespace ChocolArm64.Instructions
public static void Bx(ILEmitterCtx context)
{
IOpCodeBReg32 op = (IOpCodeBReg32)context.CurrOp;
IOpCode32BReg op = (IOpCode32BReg)context.CurrOp;
context.EmitStoreState();
@ -49,7 +49,7 @@ namespace ChocolArm64.Instructions
private static void Blx(ILEmitterCtx context, bool x)
{
IOpCodeBImm32 op = (IOpCodeBImm32)context.CurrOp;
IOpCode32BImm op = (IOpCode32BImm)context.CurrOp;
uint pc = op.GetPc();
@ -78,22 +78,5 @@ namespace ChocolArm64.Instructions
InstEmitFlowHelper.EmitCall(context, op.Imm);
}
private static void EmitBxWritePc(ILEmitterCtx context)
{
context.Emit(OpCodes.Dup);
context.EmitLdc_I4(1);
context.Emit(OpCodes.And);
context.EmitStflg((int)PState.TBit);
context.EmitLdc_I4(~1);
context.Emit(OpCodes.And);
context.Emit(OpCodes.Conv_U8);
context.Emit(OpCodes.Ret);
}
}
}

325
Instructions/InstEmitMemory32.cs Normal file
View File

@ -0,0 +1,325 @@
using ChocolArm64.Decoders;
using ChocolArm64.State;
using ChocolArm64.Translation;
using System;
using System.Reflection.Emit;
using static ChocolArm64.Instructions.InstEmit32Helper;
using static ChocolArm64.Instructions.InstEmitMemoryHelper;
namespace ChocolArm64.Instructions
{
static partial class InstEmit32
{
private const int ByteSizeLog2 = 0;
private const int HWordSizeLog2 = 1;
private const int WordSizeLog2 = 2;
private const int DWordSizeLog2 = 3;
[Flags]
enum AccessType
{
Store = 0,
Signed = 1,
Load = 2,
LoadZx = Load,
LoadSx = Load | Signed,
}
public static void Ldm(ILEmitterCtx context)
{
OpCode32MemMult op = (OpCode32MemMult)context.CurrOp;
EmitLoadFromRegister(context, op.Rn);
bool writesToPc = (op.RegisterMask & (1 << RegisterAlias.Aarch32Pc)) != 0;
bool writeBack = op.PostOffset != 0 && (op.Rn != RegisterAlias.Aarch32Pc || !writesToPc);
if (writeBack)
{
context.Emit(OpCodes.Dup);
}
context.EmitLdc_I4(op.Offset);
context.Emit(OpCodes.Add);
context.EmitSttmp();
if (writeBack)
{
context.EmitLdc_I4(op.PostOffset);
context.Emit(OpCodes.Add);
EmitStoreToRegister(context, op.Rn);
}
int mask = op.RegisterMask;
int offset = 0;
for (int register = 0; mask != 0; mask >>= 1, register++)
{
if ((mask & 1) != 0)
{
context.EmitLdarg(TranslatedSub.MemoryArgIdx);
context.EmitLdtmp();
context.EmitLdc_I4(offset);
context.Emit(OpCodes.Add);
EmitReadZxCall(context, WordSizeLog2);
EmitStoreToRegister(context, register);
offset += 4;
}
}
}
public static void Ldr(ILEmitterCtx context)
{
EmitLoadOrStore(context, WordSizeLog2, AccessType.LoadZx);
}
public static void Ldrb(ILEmitterCtx context)
{
EmitLoadOrStore(context, ByteSizeLog2, AccessType.LoadZx);
}
public static void Ldrd(ILEmitterCtx context)
{
EmitLoadOrStore(context, DWordSizeLog2, AccessType.LoadZx);
}
public static void Ldrh(ILEmitterCtx context)
{
EmitLoadOrStore(context, HWordSizeLog2, AccessType.LoadZx);
}
public static void Ldrsb(ILEmitterCtx context)
{
EmitLoadOrStore(context, ByteSizeLog2, AccessType.LoadSx);
}
public static void Ldrsh(ILEmitterCtx context)
{
EmitLoadOrStore(context, HWordSizeLog2, AccessType.LoadSx);
}
public static void Stm(ILEmitterCtx context)
{
OpCode32MemMult op = (OpCode32MemMult)context.CurrOp;
EmitLoadFromRegister(context, op.Rn);
context.EmitLdc_I4(op.Offset);
context.Emit(OpCodes.Add);
context.EmitSttmp();
int mask = op.RegisterMask;
int offset = 0;
for (int register = 0; mask != 0; mask >>= 1, register++)
{
if ((mask & 1) != 0)
{
context.EmitLdarg(TranslatedSub.MemoryArgIdx);
context.EmitLdtmp();
context.EmitLdc_I4(offset);
context.Emit(OpCodes.Add);
EmitLoadFromRegister(context, register);
EmitWriteCall(context, WordSizeLog2);
//Note: If Rn is also specified on the register list,
//and Rn is the first register on this list, then the
//value that is written to memory is the unmodified value,
//before the write back. If it is on the list, but it's
//not the first one, then the value written to memory
//varies between CPUs.
if (offset == 0 && op.PostOffset != 0)
{
//Emit write back after the first write.
EmitLoadFromRegister(context, op.Rn);
context.EmitLdc_I4(op.PostOffset);
context.Emit(OpCodes.Add);
EmitStoreToRegister(context, op.Rn);
}
offset += 4;
}
}
}
public static void Str(ILEmitterCtx context)
{
EmitLoadOrStore(context, WordSizeLog2, AccessType.Store);
}
public static void Strb(ILEmitterCtx context)
{
EmitLoadOrStore(context, ByteSizeLog2, AccessType.Store);
}
public static void Strd(ILEmitterCtx context)
{
EmitLoadOrStore(context, DWordSizeLog2, AccessType.Store);
}
public static void Strh(ILEmitterCtx context)
{
EmitLoadOrStore(context, HWordSizeLog2, AccessType.Store);
}
private static void EmitLoadOrStore(ILEmitterCtx context, int size, AccessType accType)
{
OpCode32Mem op = (OpCode32Mem)context.CurrOp;
if (op.Index || op.WBack)
{
EmitLoadFromRegister(context, op.Rn);
context.EmitLdc_I4(op.Imm);
context.Emit(op.Add ? OpCodes.Add : OpCodes.Sub);
context.EmitSttmp();
}
context.EmitLdarg(TranslatedSub.MemoryArgIdx);
if (op.Index)
{
context.EmitLdtmp();
}
else
{
EmitLoadFromRegister(context, op.Rn);
}
if ((accType & AccessType.Load) != 0)
{
if ((accType & AccessType.Signed) != 0)
{
EmitReadSx32Call(context, size);
}
else
{
EmitReadZxCall(context, size);
}
if (op.WBack)
{
context.EmitLdtmp();
EmitStoreToRegister(context, op.Rn);
}
if (size == DWordSizeLog2)
{
context.Emit(OpCodes.Dup);
context.EmitLdflg((int)PState.EBit);
ILLabel lblBigEndian = new ILLabel();
ILLabel lblEnd = new ILLabel();
context.Emit(OpCodes.Brtrue_S, lblBigEndian);
//Little endian mode.
context.Emit(OpCodes.Conv_U4);
EmitStoreToRegister(context, op.Rt);
context.EmitLsr(32);
context.Emit(OpCodes.Conv_U4);
EmitStoreToRegister(context, op.Rt | 1);
context.Emit(OpCodes.Br_S, lblEnd);
//Big endian mode.
context.MarkLabel(lblBigEndian);
context.EmitLsr(32);
context.Emit(OpCodes.Conv_U4);
EmitStoreToRegister(context, op.Rt);
context.Emit(OpCodes.Conv_U4);
EmitStoreToRegister(context, op.Rt | 1);
context.MarkLabel(lblEnd);
}
else
{
EmitStoreToRegister(context, op.Rt);
}
}
else
{
if (op.WBack)
{
context.EmitLdtmp();
EmitStoreToRegister(context, op.Rn);
}
EmitLoadFromRegister(context, op.Rt);
if (size == DWordSizeLog2)
{
context.Emit(OpCodes.Conv_U8);
context.EmitLdflg((int)PState.EBit);
ILLabel lblBigEndian = new ILLabel();
ILLabel lblEnd = new ILLabel();
context.Emit(OpCodes.Brtrue_S, lblBigEndian);
//Little endian mode.
EmitLoadFromRegister(context, op.Rt | 1);
context.Emit(OpCodes.Conv_U8);
context.EmitLsl(32);
context.Emit(OpCodes.Or);
context.Emit(OpCodes.Br_S, lblEnd);
//Big endian mode.
context.MarkLabel(lblBigEndian);
context.EmitLsl(32);
EmitLoadFromRegister(context, op.Rt | 1);
context.Emit(OpCodes.Conv_U8);
context.Emit(OpCodes.Or);
context.MarkLabel(lblEnd);
}
EmitWriteCall(context, size);
}
}
}
}

38
OpCodeTable.cs
View File

@ -37,18 +37,32 @@ namespace ChocolArm64
{
#region "OpCode Table (AArch32)"
//Integer
SetA32("<<<<0010100xxxxxxxxxxxxxxxxxxxxx", InstEmit32.Add, typeof(OpCodeAluImm32));
SetA32("<<<<0000100xxxxxxxxxxxxxxxx0xxxx", InstEmit32.Add, typeof(OpCodeAluRsImm32));
SetA32("<<<<1010xxxxxxxxxxxxxxxxxxxxxxxx", InstEmit32.B, typeof(OpCodeBImm32));
SetA32("<<<<1011xxxxxxxxxxxxxxxxxxxxxxxx", InstEmit32.Bl, typeof(OpCodeBImm32));
SetA32("1111101xxxxxxxxxxxxxxxxxxxxxxxxx", InstEmit32.Blx, typeof(OpCodeBImm32));
SetA32("<<<<000100101111111111110001xxxx", InstEmit32.Bx, typeof(OpCodeBReg32));
SetT32( "010001110xxxx000", InstEmit32.Bx, typeof(OpCodeBRegT16));
SetA32("<<<<0011101x0000xxxxxxxxxxxxxxxx", InstEmit32.Mov, typeof(OpCodeAluImm32));
SetA32("<<<<0001101x0000xxxxxxxxxxx0xxxx", InstEmit32.Mov, typeof(OpCodeAluRsImm32));
SetT32( "00100xxxxxxxxxxx", InstEmit32.Mov, typeof(OpCodeAluImm8T16));
SetA32("<<<<0010010xxxxxxxxxxxxxxxxxxxxx", InstEmit32.Sub, typeof(OpCodeAluImm32));
SetA32("<<<<0000010xxxxxxxxxxxxxxxx0xxxx", InstEmit32.Sub, typeof(OpCodeAluRsImm32));
SetA32("<<<<0010100xxxxxxxxxxxxxxxxxxxxx", InstEmit32.Add, typeof(OpCode32AluImm));
SetA32("<<<<0000100xxxxxxxxxxxxxxxx0xxxx", InstEmit32.Add, typeof(OpCode32AluRsImm));
SetA32("<<<<1010xxxxxxxxxxxxxxxxxxxxxxxx", InstEmit32.B, typeof(OpCode32BImm));
SetA32("<<<<1011xxxxxxxxxxxxxxxxxxxxxxxx", InstEmit32.Bl, typeof(OpCode32BImm));
SetA32("1111101xxxxxxxxxxxxxxxxxxxxxxxxx", InstEmit32.Blx, typeof(OpCode32BImm));
SetA32("<<<<000100101111111111110001xxxx", InstEmit32.Bx, typeof(OpCode32BReg));
SetT32("010001110xxxx000", InstEmit32.Bx, typeof(OpCodeT16BReg));
SetA32("<<<<00110101xxxx0000xxxxxxxxxxxx", InstEmit32.Cmp, typeof(OpCode32AluImm));
SetA32("<<<<00010101xxxx0000xxxxxxx0xxxx", InstEmit32.Cmp, typeof(OpCode32AluRsImm));
SetA32("<<<<100xx0x1xxxxxxxxxxxxxxxxxxxx", InstEmit32.Ldm, typeof(OpCode32MemMult));
SetA32("<<<<010xx0x1xxxxxxxxxxxxxxxxxxxx", InstEmit32.Ldr, typeof(OpCode32MemImm));
SetA32("<<<<010xx1x1xxxxxxxxxxxxxxxxxxxx", InstEmit32.Ldrb, typeof(OpCode32MemImm));
SetA32("<<<<000xx1x0xxxxxxxxxxxx1101xxxx", InstEmit32.Ldrd, typeof(OpCode32MemImm8));
SetA32("<<<<000xx1x1xxxxxxxxxxxx1011xxxx", InstEmit32.Ldrh, typeof(OpCode32MemImm8));
SetA32("<<<<000xx1x1xxxxxxxxxxxx1101xxxx", InstEmit32.Ldrsb, typeof(OpCode32MemImm8));
SetA32("<<<<000xx1x1xxxxxxxxxxxx1111xxxx", InstEmit32.Ldrsh, typeof(OpCode32MemImm8));
SetA32("<<<<0011101x0000xxxxxxxxxxxxxxxx", InstEmit32.Mov, typeof(OpCode32AluImm));
SetA32("<<<<0001101x0000xxxxxxxxxxx0xxxx", InstEmit32.Mov, typeof(OpCode32AluRsImm));
SetT32("00100xxxxxxxxxxx", InstEmit32.Mov, typeof(OpCodeT16AluImm8));
SetA32("<<<<100xx0x0xxxxxxxxxxxxxxxxxxxx", InstEmit32.Stm, typeof(OpCode32MemMult));
SetA32("<<<<010xx0x0xxxxxxxxxxxxxxxxxxxx", InstEmit32.Str, typeof(OpCode32MemImm));
SetA32("<<<<010xx1x0xxxxxxxxxxxxxxxxxxxx", InstEmit32.Strb, typeof(OpCode32MemImm));
SetA32("<<<<000xx1x0xxxxxxxxxxxx1111xxxx", InstEmit32.Strd, typeof(OpCode32MemImm8));
SetA32("<<<<000xx1x0xxxxxxxxxxxx1011xxxx", InstEmit32.Strh, typeof(OpCode32MemImm8));
SetA32("<<<<0010010xxxxxxxxxxxxxxxxxxxxx", InstEmit32.Sub, typeof(OpCode32AluImm));
SetA32("<<<<0000010xxxxxxxxxxxxxxxx0xxxx", InstEmit32.Sub, typeof(OpCode32AluRsImm));
#endregion
#region "OpCode Table (AArch64)"

19
State/CpuThreadState.cs
View File

@ -13,8 +13,6 @@ namespace ChocolArm64.State
private const int MinInstForCheck = 4000000;
public bool Thumb;
public ulong X0, X1, X2, X3, X4, X5, X6, X7,
X8, X9, X10, X11, X12, X13, X14, X15,
X16, X17, X18, X19, X20, X21, X22, X23,
@ -25,13 +23,16 @@ namespace ChocolArm64.State
V16, V17, V18, V19, V20, V21, V22, V23,
V24, V25, V26, V27, V28, V29, V30, V31;
public bool Aarch32;
public bool Thumb;
public bool BigEndian;
public bool Overflow;
public bool Carry;
public bool Zero;
public bool Negative;
public bool IsAarch32;
public int ElrHyp;
public bool Running { get; set; }
@ -51,10 +52,10 @@ namespace ChocolArm64.State
{
get
{
return (Negative ? (int)PState.N : 0) |
(Zero ? (int)PState.Z : 0) |
(Carry ? (int)PState.C : 0) |
(Overflow ? (int)PState.V : 0);
return (Negative ? (int)PState.NMask : 0) |
(Zero ? (int)PState.ZMask : 0) |
(Carry ? (int)PState.CMask : 0) |
(Overflow ? (int)PState.VMask : 0);
}
}
@ -140,7 +141,7 @@ namespace ChocolArm64.State
internal ExecutionMode GetExecutionMode()
{
if (!IsAarch32)
if (!Aarch32)
{
return ExecutionMode.Aarch64;
}

17
State/PState.cs
View File

@ -6,22 +6,19 @@ namespace ChocolArm64.State
enum PState
{
TBit = 5,
EBit = 9,
VBit = 28,
CBit = 29,
ZBit = 30,
NBit = 31,
T = 1 << TBit,
TMask = 1 << TBit,
EMask = 1 << EBit,
V = 1 << VBit,
C = 1 << CBit,
Z = 1 << ZBit,
N = 1 << NBit,
Nz = N | Z,
Cv = C | V,
Nzcv = Nz | Cv
VMask = 1 << VBit,
CMask = 1 << CBit,
ZMask = 1 << ZBit,
NMask = 1 << NBit
}
}

1
State/Register.cs
View File

@ -44,6 +44,7 @@ namespace ChocolArm64.State
switch ((PState)Index)
{
case PState.TBit: return GetField(nameof(CpuThreadState.Thumb));
case PState.EBit: return GetField(nameof(CpuThreadState.BigEndian));
case PState.VBit: return GetField(nameof(CpuThreadState.Overflow));
case PState.CBit: return GetField(nameof(CpuThreadState.Carry));

10
Translation/ILEmitterCtx.cs
View File

@ -530,7 +530,15 @@ namespace ChocolArm64.Translation
public void EmitLdflg(int index) => Ldloc(index, IoType.Flag);
public void EmitStflg(int index)
{
_optOpLastFlagSet = CurrOp;
//Set this only if any of the NZCV flag bits were modified.
//This is used to ensure that, when emiting a direct IL branch
//instruction for compare + branch sequences, we're not expecting
//to use comparison values from an old instruction, when in fact
//the flags were already overwritten by another instruction further along.
if (index >= (int)PState.VBit)
{
_optOpLastFlagSet = CurrOp;
}
Stloc(index, IoType.Flag);
}