98e05ee4b7
* Decoders: Add InITBlock argument
* OpCodeTable: Minor cleanup
* OpCodeTable: Remove existing thumb instruction implementations
* OpCodeTable: Prepare for thumb instructions
* OpCodeTables: Improve thumb fast lookup
* Tests: Prepare for thumb tests
* T16: Implement BX
* T16: Implement LSL/LSR/ASR (imm)
* T16: Implement ADDS, SUBS (reg)
* T16: Implement ADDS, SUBS (3-bit immediate)
* T16: Implement MOVS, CMP, ADDS, SUBS (8-bit immediate)
* T16: Implement ANDS, EORS, LSLS, LSRS, ASRS, ADCS, SBCS, RORS, TST, NEGS, CMP, CMN, ORRS, MULS, BICS, MVNS (low registers)
* T16: Implement ADD, CMP, MOV (high reg)
* T16: Implement BLX (reg)
* T16: Implement LDR (literal)
* T16: Implement {LDR,STR}{,H,B,SB,SH} (register)
* T16: Implement {LDR,STR}{,B,H} (immediate)
* T16: Implement LDR/STR (SP)
* T16: Implement ADR
* T16: Implement Add to SP (immediate)
* T16: Implement ADD/SUB (SP)
* T16: Implement SXTH, SXTB, UXTH, UTXB
* T16: Implement CBZ, CBNZ
* T16: Implement PUSH, POP
* T16: Implement REV, REV16, REVSH
* T16: Implement NOP
* T16: Implement LDM, STM
* T16: Implement SVC
* T16: Implement B (conditional)
* T16: Implement B (unconditional)
* T16: Implement IT
* fixup! T16: Implement ADD/SUB (SP)
* fixup! T16: Implement Add to SP (immediate)
* fixup! T16: Implement IT
* CpuTestThumb: Add randomized tests
* Remove inITBlock argument
* Address nits
* Use index to handle IfThenBlockState
* Reduce line noise
* fixup
* nit
843 lines
25 KiB
C#
843 lines
25 KiB
C#
using ARMeilleure.Decoders;
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using ARMeilleure.IntermediateRepresentation;
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using ARMeilleure.State;
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using ARMeilleure.Translation;
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using static ARMeilleure.Instructions.InstEmitAluHelper;
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using static ARMeilleure.Instructions.InstEmitHelper;
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using static ARMeilleure.IntermediateRepresentation.Operand.Factory;
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namespace ARMeilleure.Instructions
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{
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static partial class InstEmit32
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{
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public static void Add(ArmEmitterContext context)
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{
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IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
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Operand n = GetAluN(context);
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Operand m = GetAluM(context, setCarry: false);
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Operand res = context.Add(n, m);
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if (ShouldSetFlags(context))
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{
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EmitNZFlagsCheck(context, res);
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EmitAddsCCheck(context, n, res);
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EmitAddsVCheck(context, n, m, res);
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}
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EmitAluStore(context, res);
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}
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public static void Adc(ArmEmitterContext context)
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{
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IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
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Operand n = GetAluN(context);
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Operand m = GetAluM(context, setCarry: false);
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Operand res = context.Add(n, m);
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Operand carry = GetFlag(PState.CFlag);
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res = context.Add(res, carry);
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if (ShouldSetFlags(context))
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{
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EmitNZFlagsCheck(context, res);
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EmitAdcsCCheck(context, n, res);
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EmitAddsVCheck(context, n, m, res);
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}
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EmitAluStore(context, res);
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}
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public static void And(ArmEmitterContext context)
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{
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IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
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Operand n = GetAluN(context);
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Operand m = GetAluM(context);
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Operand res = context.BitwiseAnd(n, m);
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if (ShouldSetFlags(context))
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{
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EmitNZFlagsCheck(context, res);
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}
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EmitAluStore(context, res);
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}
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public static void Bfc(ArmEmitterContext context)
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{
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OpCode32AluBf op = (OpCode32AluBf)context.CurrOp;
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Operand d = GetIntA32(context, op.Rd);
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Operand res = context.BitwiseAnd(d, Const(~op.DestMask));
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SetIntA32(context, op.Rd, res);
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}
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public static void Bfi(ArmEmitterContext context)
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{
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OpCode32AluBf op = (OpCode32AluBf)context.CurrOp;
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Operand n = GetIntA32(context, op.Rn);
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Operand d = GetIntA32(context, op.Rd);
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Operand part = context.BitwiseAnd(n, Const(op.SourceMask));
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if (op.Lsb != 0)
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{
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part = context.ShiftLeft(part, Const(op.Lsb));
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}
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Operand res = context.BitwiseAnd(d, Const(~op.DestMask));
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res = context.BitwiseOr(res, context.BitwiseAnd(part, Const(op.DestMask)));
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SetIntA32(context, op.Rd, res);
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}
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public static void Bic(ArmEmitterContext context)
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{
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IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
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Operand n = GetAluN(context);
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Operand m = GetAluM(context);
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Operand res = context.BitwiseAnd(n, context.BitwiseNot(m));
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if (ShouldSetFlags(context))
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{
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EmitNZFlagsCheck(context, res);
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}
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EmitAluStore(context, res);
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}
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public static void Clz(ArmEmitterContext context)
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{
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Operand m = GetAluM(context, setCarry: false);
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Operand res = context.CountLeadingZeros(m);
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EmitAluStore(context, res);
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}
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public static void Cmp(ArmEmitterContext context)
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{
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Operand n = GetAluN(context);
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Operand m = GetAluM(context, setCarry: false);
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Operand res = context.Subtract(n, m);
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EmitNZFlagsCheck(context, res);
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EmitSubsCCheck(context, n, res);
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EmitSubsVCheck(context, n, m, res);
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}
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public static void Cmn(ArmEmitterContext context)
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{
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Operand n = GetAluN(context);
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Operand m = GetAluM(context, setCarry: false);
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Operand res = context.Add(n, m);
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EmitNZFlagsCheck(context, res);
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EmitAddsCCheck(context, n, res);
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EmitAddsVCheck(context, n, m, res);
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}
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public static void Eor(ArmEmitterContext context)
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{
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IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
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Operand n = GetAluN(context);
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Operand m = GetAluM(context);
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Operand res = context.BitwiseExclusiveOr(n, m);
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if (ShouldSetFlags(context))
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{
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EmitNZFlagsCheck(context, res);
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}
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EmitAluStore(context, res);
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}
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public static void Mov(ArmEmitterContext context)
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{
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IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
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Operand m = GetAluM(context);
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if (ShouldSetFlags(context))
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{
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EmitNZFlagsCheck(context, m);
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}
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EmitAluStore(context, m);
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}
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public static void Movt(ArmEmitterContext context)
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{
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OpCode32AluImm16 op = (OpCode32AluImm16)context.CurrOp;
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Operand d = GetIntA32(context, op.Rd);
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Operand imm = Const(op.Immediate << 16); // Immeditate value as top halfword.
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Operand res = context.BitwiseAnd(d, Const(0x0000ffff));
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res = context.BitwiseOr(res, imm);
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EmitAluStore(context, res);
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}
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public static void Mul(ArmEmitterContext context)
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{
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IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
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Operand n = GetAluN(context);
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Operand m = GetAluM(context);
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Operand res = context.Multiply(n, m);
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if (ShouldSetFlags(context))
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{
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EmitNZFlagsCheck(context, res);
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}
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EmitAluStore(context, res);
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}
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public static void Mvn(ArmEmitterContext context)
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{
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IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
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Operand m = GetAluM(context);
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Operand res = context.BitwiseNot(m);
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if (ShouldSetFlags(context))
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{
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EmitNZFlagsCheck(context, res);
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}
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EmitAluStore(context, res);
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}
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public static void Orr(ArmEmitterContext context)
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{
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IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
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Operand n = GetAluN(context);
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Operand m = GetAluM(context);
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Operand res = context.BitwiseOr(n, m);
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if (ShouldSetFlags(context))
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{
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EmitNZFlagsCheck(context, res);
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}
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EmitAluStore(context, res);
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}
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public static void Pkh(ArmEmitterContext context)
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{
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OpCode32AluRsImm op = (OpCode32AluRsImm)context.CurrOp;
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Operand n = GetAluN(context);
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Operand m = GetAluM(context);
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Operand res;
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bool tbform = op.ShiftType == ShiftType.Asr;
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if (tbform)
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{
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res = context.BitwiseOr(context.BitwiseAnd(n, Const(0xFFFF0000)), context.BitwiseAnd(m, Const(0xFFFF)));
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}
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else
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{
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res = context.BitwiseOr(context.BitwiseAnd(m, Const(0xFFFF0000)), context.BitwiseAnd(n, Const(0xFFFF)));
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}
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EmitAluStore(context, res);
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}
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public static void Rbit(ArmEmitterContext context)
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{
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Operand m = GetAluM(context);
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Operand res = EmitReverseBits32Op(context, m);
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EmitAluStore(context, res);
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}
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public static void Rev(ArmEmitterContext context)
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{
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Operand m = GetAluM(context);
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Operand res = context.ByteSwap(m);
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EmitAluStore(context, res);
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}
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public static void Rev16(ArmEmitterContext context)
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{
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Operand m = GetAluM(context);
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Operand res = EmitReverseBytes16_32Op(context, m);
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EmitAluStore(context, res);
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}
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public static void Revsh(ArmEmitterContext context)
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{
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Operand m = GetAluM(context);
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Operand res = EmitReverseBytes16_32Op(context, m);
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EmitAluStore(context, context.SignExtend16(OperandType.I32, res));
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}
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public static void Rsc(ArmEmitterContext context)
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{
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IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
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Operand n = GetAluN(context);
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Operand m = GetAluM(context, setCarry: false);
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Operand res = context.Subtract(m, n);
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Operand borrow = context.BitwiseExclusiveOr(GetFlag(PState.CFlag), Const(1));
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res = context.Subtract(res, borrow);
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if (ShouldSetFlags(context))
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{
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EmitNZFlagsCheck(context, res);
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EmitSbcsCCheck(context, m, n);
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EmitSubsVCheck(context, m, n, res);
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}
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EmitAluStore(context, res);
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}
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public static void Rsb(ArmEmitterContext context)
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{
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IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
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Operand n = GetAluN(context);
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Operand m = GetAluM(context, setCarry: false);
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Operand res = context.Subtract(m, n);
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if (ShouldSetFlags(context))
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{
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EmitNZFlagsCheck(context, res);
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EmitSubsCCheck(context, m, res);
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EmitSubsVCheck(context, m, n, res);
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}
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EmitAluStore(context, res);
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}
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public static void Sbc(ArmEmitterContext context)
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{
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IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
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Operand n = GetAluN(context);
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Operand m = GetAluM(context, setCarry: false);
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Operand res = context.Subtract(n, m);
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Operand borrow = context.BitwiseExclusiveOr(GetFlag(PState.CFlag), Const(1));
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res = context.Subtract(res, borrow);
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if (ShouldSetFlags(context))
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{
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EmitNZFlagsCheck(context, res);
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EmitSbcsCCheck(context, n, m);
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EmitSubsVCheck(context, n, m, res);
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}
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EmitAluStore(context, res);
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}
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public static void Sbfx(ArmEmitterContext context)
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{
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OpCode32AluBf op = (OpCode32AluBf)context.CurrOp;
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var msb = op.Lsb + op.Msb; // For this instruction, the msb is actually a width.
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Operand n = GetIntA32(context, op.Rn);
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Operand res = context.ShiftRightSI(context.ShiftLeft(n, Const(31 - msb)), Const(31 - op.Msb));
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SetIntA32(context, op.Rd, res);
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}
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public static void Sdiv(ArmEmitterContext context)
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{
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EmitDiv(context, false);
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}
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public static void Shadd8(ArmEmitterContext context)
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{
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EmitHadd8(context, false);
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}
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public static void Shsub8(ArmEmitterContext context)
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{
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EmitHsub8(context, false);
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}
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public static void Ssat(ArmEmitterContext context)
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{
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OpCode32Sat op = (OpCode32Sat)context.CurrOp;
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EmitSat(context, -(1 << op.SatImm), (1 << op.SatImm) - 1);
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}
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public static void Ssat16(ArmEmitterContext context)
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{
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OpCode32Sat16 op = (OpCode32Sat16)context.CurrOp;
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EmitSat16(context, -(1 << op.SatImm), (1 << op.SatImm) - 1);
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}
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public static void Sub(ArmEmitterContext context)
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{
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IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
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Operand n = GetAluN(context);
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Operand m = GetAluM(context, setCarry: false);
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Operand res = context.Subtract(n, m);
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if (ShouldSetFlags(context))
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{
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EmitNZFlagsCheck(context, res);
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EmitSubsCCheck(context, n, res);
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EmitSubsVCheck(context, n, m, res);
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}
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EmitAluStore(context, res);
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}
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public static void Sxtb(ArmEmitterContext context)
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{
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EmitSignExtend(context, true, 8);
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}
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public static void Sxtb16(ArmEmitterContext context)
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{
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EmitExtend16(context, true);
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}
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public static void Sxth(ArmEmitterContext context)
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{
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EmitSignExtend(context, true, 16);
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}
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public static void Teq(ArmEmitterContext context)
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{
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Operand n = GetAluN(context);
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Operand m = GetAluM(context);
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Operand res = context.BitwiseExclusiveOr(n, m);
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EmitNZFlagsCheck(context, res);
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}
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public static void Tst(ArmEmitterContext context)
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{
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Operand n = GetAluN(context);
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Operand m = GetAluM(context);
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Operand res = context.BitwiseAnd(n, m);
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EmitNZFlagsCheck(context, res);
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}
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public static void Ubfx(ArmEmitterContext context)
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{
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OpCode32AluBf op = (OpCode32AluBf)context.CurrOp;
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var msb = op.Lsb + op.Msb; // For this instruction, the msb is actually a width.
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Operand n = GetIntA32(context, op.Rn);
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Operand res = context.ShiftRightUI(context.ShiftLeft(n, Const(31 - msb)), Const(31 - op.Msb));
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SetIntA32(context, op.Rd, res);
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}
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public static void Udiv(ArmEmitterContext context)
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{
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EmitDiv(context, true);
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}
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public static void Uhadd8(ArmEmitterContext context)
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{
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EmitHadd8(context, true);
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}
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public static void Uhsub8(ArmEmitterContext context)
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{
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EmitHsub8(context, true);
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}
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public static void Usat(ArmEmitterContext context)
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{
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OpCode32Sat op = (OpCode32Sat)context.CurrOp;
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EmitSat(context, 0, op.SatImm == 32 ? (int)(~0) : (1 << op.SatImm) - 1);
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}
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public static void Usat16(ArmEmitterContext context)
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{
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OpCode32Sat16 op = (OpCode32Sat16)context.CurrOp;
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EmitSat16(context, 0, (1 << op.SatImm) - 1);
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}
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public static void Uxtb(ArmEmitterContext context)
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{
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EmitSignExtend(context, false, 8);
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}
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public static void Uxtb16(ArmEmitterContext context)
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{
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EmitExtend16(context, false);
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}
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public static void Uxth(ArmEmitterContext context)
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{
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EmitSignExtend(context, false, 16);
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}
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private static void EmitSignExtend(ArmEmitterContext context, bool signed, int bits)
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{
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IOpCode32AluUx op = (IOpCode32AluUx)context.CurrOp;
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Operand m = GetAluM(context);
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Operand res;
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if (op.RotateBits == 0)
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{
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res = m;
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}
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else
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{
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Operand rotate = Const(op.RotateBits);
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res = context.RotateRight(m, rotate);
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}
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switch (bits)
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{
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case 8:
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res = (signed) ? context.SignExtend8(OperandType.I32, res) : context.ZeroExtend8(OperandType.I32, res);
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break;
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case 16:
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res = (signed) ? context.SignExtend16(OperandType.I32, res) : context.ZeroExtend16(OperandType.I32, res);
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break;
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}
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if (op.Add)
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{
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res = context.Add(res, GetAluN(context));
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}
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EmitAluStore(context, res);
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}
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private static void EmitExtend16(ArmEmitterContext context, bool signed)
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{
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IOpCode32AluUx op = (IOpCode32AluUx)context.CurrOp;
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Operand m = GetAluM(context);
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Operand res;
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if (op.RotateBits == 0)
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{
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res = m;
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}
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else
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{
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Operand rotate = Const(op.RotateBits);
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res = context.RotateRight(m, rotate);
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}
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Operand low16, high16;
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if (signed)
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{
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low16 = context.SignExtend8(OperandType.I32, res);
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high16 = context.SignExtend8(OperandType.I32, context.ShiftRightUI(res, Const(16)));
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}
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else
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{
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low16 = context.ZeroExtend8(OperandType.I32, res);
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high16 = context.ZeroExtend8(OperandType.I32, context.ShiftRightUI(res, Const(16)));
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}
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if (op.Add)
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{
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Operand n = GetAluN(context);
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Operand lowAdd, highAdd;
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if (signed)
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{
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lowAdd = context.SignExtend16(OperandType.I32, n);
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highAdd = context.SignExtend16(OperandType.I32, context.ShiftRightUI(n, Const(16)));
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}
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else
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{
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lowAdd = context.ZeroExtend16(OperandType.I32, n);
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highAdd = context.ZeroExtend16(OperandType.I32, context.ShiftRightUI(n, Const(16)));
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}
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low16 = context.Add(low16, lowAdd);
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high16 = context.Add(high16, highAdd);
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}
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res = context.BitwiseOr(
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context.ZeroExtend16(OperandType.I32, low16),
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context.ShiftLeft(context.ZeroExtend16(OperandType.I32, high16), Const(16)));
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EmitAluStore(context, res);
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}
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private static void EmitDiv(ArmEmitterContext context, bool unsigned)
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{
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Operand n = GetAluN(context);
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Operand m = GetAluM(context);
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Operand zero = Const(m.Type, 0);
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Operand divisorIsZero = context.ICompareEqual(m, zero);
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Operand lblBadDiv = Label();
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Operand lblEnd = Label();
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context.BranchIfTrue(lblBadDiv, divisorIsZero);
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if (!unsigned)
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{
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// ARM64 behaviour: If Rn == INT_MIN && Rm == -1, Rd = INT_MIN (overflow).
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// TODO: tests to ensure A32 works the same
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Operand intMin = Const(int.MinValue);
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Operand minus1 = Const(-1);
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Operand nIsIntMin = context.ICompareEqual(n, intMin);
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Operand mIsMinus1 = context.ICompareEqual(m, minus1);
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Operand lblGoodDiv = Label();
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context.BranchIfFalse(lblGoodDiv, context.BitwiseAnd(nIsIntMin, mIsMinus1));
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EmitAluStore(context, intMin);
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context.Branch(lblEnd);
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context.MarkLabel(lblGoodDiv);
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}
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Operand res = unsigned
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? context.DivideUI(n, m)
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: context.Divide(n, m);
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EmitAluStore(context, res);
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context.Branch(lblEnd);
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context.MarkLabel(lblBadDiv);
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EmitAluStore(context, zero);
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context.MarkLabel(lblEnd);
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}
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private static void EmitHadd8(ArmEmitterContext context, bool unsigned)
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{
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OpCode32AluReg op = (OpCode32AluReg)context.CurrOp;
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Operand m = GetIntA32(context, op.Rm);
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Operand n = GetIntA32(context, op.Rn);
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Operand xor, res, carry;
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// This relies on the equality x+y == ((x&y) << 1) + (x^y).
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// Note that x^y always contains the LSB of the result.
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// Since we want to calculate (x+y)/2, we can instead calculate (x&y) + ((x^y)>>1).
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// We mask by 0x7F to remove the LSB so that it doesn't leak into the field below.
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res = context.BitwiseAnd(m, n);
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carry = context.BitwiseExclusiveOr(m, n);
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xor = context.ShiftRightUI(carry, Const(1));
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xor = context.BitwiseAnd(xor, Const(0x7F7F7F7Fu));
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res = context.Add(res, xor);
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if (!unsigned)
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{
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// Propagates the sign bit from (x^y)>>1 upwards by one.
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carry = context.BitwiseAnd(carry, Const(0x80808080u));
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res = context.BitwiseExclusiveOr(res, carry);
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}
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SetIntA32(context, op.Rd, res);
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}
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private static void EmitHsub8(ArmEmitterContext context, bool unsigned)
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{
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OpCode32AluReg op = (OpCode32AluReg)context.CurrOp;
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Operand m = GetIntA32(context, op.Rm);
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Operand n = GetIntA32(context, op.Rn);
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Operand left, right, carry, res;
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// This relies on the equality x-y == (x^y) - (((x^y)&y) << 1).
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// Note that x^y always contains the LSB of the result.
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// Since we want to calculate (x+y)/2, we can instead calculate ((x^y)>>1) - ((x^y)&y).
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carry = context.BitwiseExclusiveOr(m, n);
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left = context.ShiftRightUI(carry, Const(1));
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right = context.BitwiseAnd(carry, m);
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// We must now perform a partitioned subtraction.
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// We can do this because minuend contains 7 bit fields.
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// We use the extra bit in minuend as a bit to borrow from; we set this bit.
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// We invert this bit at the end as this tells us if that bit was borrowed from.
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res = context.BitwiseOr(left, Const(0x80808080));
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res = context.Subtract(res, right);
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res = context.BitwiseExclusiveOr(res, Const(0x80808080));
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if (!unsigned)
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{
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// We then sign extend the result into this bit.
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carry = context.BitwiseAnd(carry, Const(0x80808080));
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res = context.BitwiseExclusiveOr(res, carry);
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}
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SetIntA32(context, op.Rd, res);
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}
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private static void EmitSat(ArmEmitterContext context, int intMin, int intMax)
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{
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OpCode32Sat op = (OpCode32Sat)context.CurrOp;
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Operand n = GetIntA32(context, op.Rn);
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int shift = DecodeImmShift(op.ShiftType, op.Imm5);
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switch (op.ShiftType)
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{
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case ShiftType.Lsl:
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if (shift == 32)
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{
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n = Const(0);
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}
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else
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{
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n = context.ShiftLeft(n, Const(shift));
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}
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break;
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case ShiftType.Asr:
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if (shift == 32)
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{
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n = context.ShiftRightSI(n, Const(31));
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}
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else
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{
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n = context.ShiftRightSI(n, Const(shift));
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}
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break;
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}
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Operand lblCheckLtIntMin = Label();
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Operand lblNoSat = Label();
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Operand lblEnd = Label();
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context.BranchIfFalse(lblCheckLtIntMin, context.ICompareGreater(n, Const(intMax)));
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SetFlag(context, PState.QFlag, Const(1));
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SetIntA32(context, op.Rd, Const(intMax));
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context.Branch(lblEnd);
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context.MarkLabel(lblCheckLtIntMin);
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context.BranchIfFalse(lblNoSat, context.ICompareLess(n, Const(intMin)));
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SetFlag(context, PState.QFlag, Const(1));
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SetIntA32(context, op.Rd, Const(intMin));
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context.Branch(lblEnd);
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context.MarkLabel(lblNoSat);
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SetIntA32(context, op.Rd, n);
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context.MarkLabel(lblEnd);
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}
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private static void EmitSat16(ArmEmitterContext context, int intMin, int intMax)
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{
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OpCode32Sat16 op = (OpCode32Sat16)context.CurrOp;
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void SetD(int part, Operand value)
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{
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if (part == 0)
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{
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SetIntA32(context, op.Rd, context.ZeroExtend16(OperandType.I32, value));
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}
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else
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{
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SetIntA32(context, op.Rd, context.BitwiseOr(GetIntA32(context, op.Rd), context.ShiftLeft(value, Const(16))));
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}
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}
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Operand n = GetIntA32(context, op.Rn);
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Operand nLow = context.SignExtend16(OperandType.I32, n);
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Operand nHigh = context.ShiftRightSI(n, Const(16));
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for (int part = 0; part < 2; part++)
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{
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Operand nPart = part == 0 ? nLow : nHigh;
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Operand lblCheckLtIntMin = Label();
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Operand lblNoSat = Label();
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Operand lblEnd = Label();
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context.BranchIfFalse(lblCheckLtIntMin, context.ICompareGreater(nPart, Const(intMax)));
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SetFlag(context, PState.QFlag, Const(1));
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SetD(part, Const(intMax));
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context.Branch(lblEnd);
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context.MarkLabel(lblCheckLtIntMin);
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context.BranchIfFalse(lblNoSat, context.ICompareLess(nPart, Const(intMin)));
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SetFlag(context, PState.QFlag, Const(1));
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SetD(part, Const(intMin));
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context.Branch(lblEnd);
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context.MarkLabel(lblNoSat);
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SetD(part, nPart);
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context.MarkLabel(lblEnd);
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}
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}
|
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private static void EmitAluStore(ArmEmitterContext context, Operand value)
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{
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IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
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EmitGenericAluStoreA32(context, op.Rd, ShouldSetFlags(context), value);
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}
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}
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}
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