A32: Allow hooking of hint instructions in ARM mode.

Mirrors the hooking functionality from the AArch64 frontend to make the
behavior of both consistent.

include/dynarmic/A32/config.h

@@ -24,8 +24,18 @@ enum class Exception {
     /// An unpredictable instruction is to be executed. Implementation-defined behaviour should now happen.
     /// This behaviour is up to the user of this library to define.
     UnpredictableInstruction,
+    /// A SEV instruction was executed. The event register of all PEs should be set.
+    SendEvent,
+    /// A WFI instruction was executed. You may now enter a low-power state.
+    WaitForInterrupt,
+    /// A WFE instruction was executed. You may now enter a low-power state if the event register is clear.
+    WaitForEvent,
+    /// A YIELD instruction was executed.
+    Yield,
     /// A BKPT instruction was executed.
     Breakpoint,
+    /// A PLD instruction was executed.
+    PreloadData,
 };
 
 /// These function pointers may be inserted into compiled code.

src/CMakeLists.txt

@@ -103,6 +103,7 @@ add_library(dynarmic
     frontend/A32/translate/translate_arm/divide.cpp
     frontend/A32/translate/translate_arm/exception_generating.cpp
     frontend/A32/translate/translate_arm/extension.cpp
+    frontend/A32/translate/translate_arm/hint.cpp
     frontend/A32/translate/translate_arm/load_store.cpp
     frontend/A32/translate/translate_arm/misc.cpp
     frontend/A32/translate/translate_arm/multiply.cpp

src/frontend/A32/translate/translate_arm.cpp

@@ -157,6 +157,13 @@ bool ArmTranslatorVisitor::UndefinedInstruction() {
     return false;
 }
 
+bool ArmTranslatorVisitor::RaiseException(Exception exception) {
+    ir.BranchWritePC(ir.Imm32(ir.current_location.PC() + 4));
+    ir.ExceptionRaised(exception);
+    ir.SetTerm(IR::Term::CheckHalt{IR::Term::ReturnToDispatch{}});
+    return false;
+}
+
 IR::ResultAndCarry<IR::U32> ArmTranslatorVisitor::EmitImmShift(IR::U32 value, ShiftType type, Imm<5> imm5, IR::U1 carry_in) {
     u8 imm5_value = imm5.ZeroExtend<u8>();
 

src/frontend/A32/translate/translate_arm/hint.cpp

@@ -0,0 +1,32 @@
+/* This file is part of the dynarmic project.
+ * Copyright (c) 2019 MerryMage
+ * This software may be used and distributed according to the terms of the GNU
+ * General Public License version 2 or any later version.
+ */
+
+#include <dynarmic/A32/config.h>
+#include "translate_arm.h"
+
+namespace Dynarmic::A32 {
+
+bool ArmTranslatorVisitor::arm_PLD() {
+    return RaiseException(Exception::PreloadData);
+}
+
+bool ArmTranslatorVisitor::arm_SEV() {
+    return RaiseException(Exception::SendEvent);
+}
+
+bool ArmTranslatorVisitor::arm_WFE() {
+    return RaiseException(Exception::WaitForEvent);
+}
+
+bool ArmTranslatorVisitor::arm_WFI() {
+    return RaiseException(Exception::WaitForInterrupt);
+}
+
+bool ArmTranslatorVisitor::arm_YIELD() {
+    return RaiseException(Exception::Yield);
+}
+
+} // namespace Dynarmic::A32

src/frontend/A32/translate/translate_arm/translate_arm.h

@@ -14,6 +14,8 @@
 
 namespace Dynarmic::A32 {
 
+enum class Exception;
+
 enum class ConditionalState {
     /// We haven't met any conditional instructions yet.
     None,
@@ -40,6 +42,7 @@ struct ArmTranslatorVisitor final {
     bool InterpretThisInstruction();
     bool UnpredictableInstruction();
     bool UndefinedInstruction();
+    bool RaiseException(Exception exception);
 
     static u32 ArmExpandImm(int rotate, Imm<8> imm8) {
         return Common::RotateRight<u32>(imm8.ZeroExtend(), rotate * 2);
@@ -157,11 +160,11 @@ struct ArmTranslatorVisitor final {
     bool arm_UXTH(Cond cond, Reg d, SignExtendRotation rotate, Reg m);
 
     // Hint instructions
-    bool arm_PLD() { return true; }
+    bool arm_PLD();
-    bool arm_SEV() { return true; }
+    bool arm_SEV();
-    bool arm_WFE() { return true; }
+    bool arm_WFE();
-    bool arm_WFI() { return true; }
+    bool arm_WFI();
-    bool arm_YIELD() { return true; }
+    bool arm_YIELD();
 
     // Load/Store
     bool arm_LDRBT();