Add some common JIT infrastructure

I used Dolphin as a reference for this, of course, though I also looked at Citra.

JitBase is almost done; I just have to figure out how to make ExecuteInstructions.

src/core/CMakeLists.txt

@@ -97,6 +97,8 @@ set(HEADERS
             arm/dyncom/arm_dyncom_run.h
             arm/dyncom/arm_dyncom_thumb.h
             arm/interpreter/arm_interpreter.h
+            arm/jit_common/jit_util.h
+            arm/jit_common/jit_base.h
             arm/skyeye_common/arm_regformat.h
             arm/skyeye_common/armcpu.h
             arm/skyeye_common/armdefs.h

src/core/arm/jit_common/jit_base.cpp

@@ -0,0 +1,118 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "core/arm/skyeye_common/armcpu.h"
+#include "core/arm/skyeye_common/armemu.h"
+#include "core/arm/skyeye_common/vfp/vfp.h"
+
+#include "core/arm/jit_common/jit_base.h"
+
+#include "core/core.h"
+#include "core/core_timing.h"
+
+const static cpu_config_t s_arm11_cpu_info = {
+    "armv6", "arm11", 0x0007b000, 0x0007f000, NONCACHE
+};
+
+JitBase::JitBase() {
+	state = std::unique_ptr<ARMul_State>(new ARMul_State);
+
+    ARMul_EmulateInit();
+    memset(state.get(), 0, sizeof(ARMul_State));
+
+    ARMul_NewState((ARMul_State*)state.get());
+
+    state->abort_model = 0;
+    state->cpu = (cpu_config_t*)&s_arm11_cpu_info;
+    state->bigendSig = LOW;
+
+    ARMul_SelectProcessor(state.get(), ARM_v6_Prop | ARM_v5_Prop | ARM_v5e_Prop);
+    state->lateabtSig = LOW;
+
+    // Reset the core to initial state
+    ARMul_CoProInit(state.get());
+    ARMul_Reset(state.get());
+    state->NextInstr = RESUME; // NOTE: This will be overwritten by LoadContext
+    state->Emulate = 3;
+
+    state->pc = state->Reg[15] = 0x00000000;
+    state->Reg[13] = 0x10000000; // Set stack pointer to the top of the stack
+    state->servaddr = 0xFFFF0000;
+    state->NirqSig = HIGH;
+
+    VFPInit(state.get()); // Initialize the VFP
+
+    ARMul_EmulateInit();
+}
+
+void JitBase::SetPC(u32 pc) {
+    state->pc = state->Reg[15] = pc;
+}
+
+u32 JitBase::GetPC() const {
+    return state->Reg[15];
+}
+
+u32 JitBase::GetReg(int index) const {
+    return state->Reg[index];
+}
+
+void JitBase::SetReg(int index, u32 value) {
+    state->Reg[index] = value;
+}
+
+u32 JitBase::GetCPSR() const {
+    return state->Cpsr;
+}
+
+void JitBase::SetCPSR(u32 cpsr) {
+    state->Cpsr = cpsr;
+}
+
+u64 JitBase::GetTicks() const {
+    // TODO(Subv): Remove ARM_DynCom::GetTicks() and use CoreTiming::GetTicks() directly once ARMemu is gone
+    return CoreTiming::GetTicks();
+}
+
+void JitBase::AddTicks(u64 ticks) {
+    down_count -= ticks;
+    if (down_count < 0)
+        CoreTiming::Advance();
+}
+
+void ARM_DynCom::SaveContext(Core::ThreadContext& ctx) {
+    memcpy(ctx.cpu_registers, state->Reg, sizeof(ctx.cpu_registers));
+    memcpy(ctx.fpu_registers, state->ExtReg, sizeof(ctx.fpu_registers));
+
+    ctx.sp = state->Reg[13];
+    ctx.lr = state->Reg[14];
+    ctx.pc = state->Reg[15];
+    ctx.cpsr = state->Cpsr;
+
+    ctx.fpscr = state->VFP[1];
+    ctx.fpexc = state->VFP[2];
+
+    ctx.reg_15 = state->Reg[15];
+    ctx.mode = state->NextInstr;
+}
+
+void ARM_DynCom::LoadContext(const Core::ThreadContext& ctx) {
+    memcpy(state->Reg, ctx.cpu_registers, sizeof(ctx.cpu_registers));
+    memcpy(state->ExtReg, ctx.fpu_registers, sizeof(ctx.fpu_registers));
+
+    state->Reg[13] = ctx.sp;
+    state->Reg[14] = ctx.lr;
+    state->pc = ctx.pc;
+    state->Cpsr = ctx.cpsr;
+
+    state->VFP[1] = ctx.fpscr;
+    state->VFP[2] = ctx.fpexc;
+
+    state->Reg[15] = ctx.reg_15;
+    state->NextInstr = ctx.mode;
+}
+
+void ARM_DynCom::PrepareReschedule() {
+    state->NumInstrsToExecute = 0;
+}

src/core/arm/jit_common/jit_base.h

@@ -0,0 +1,43 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "common/x64_abi.h"
+#include "common/x64_emitter.h"
+#include "jit_util.h"
+#include "core/arm/arm_interface.h"
+#include "core/arm/skyeye_common/armdefs.h"
+
+#define RSCRATCH RAX
+#define RSCRATCH2 RDX
+
+class JitBase : virtual public ARM_Interface
+{
+protected:
+        struct JitState
+        {
+          u32 compilerPC;
+          u32 blockStart;
+        };
+public:
+        JitState js;
+        void SetPC(u32 pc) override;
+        u32 GetPC() const override;
+        void SetReg(int index, u32 value) override;
+        u32 GetReg(int index) const override;
+        void SetCPSR(u32 pc) override;
+        u32 GetCPSR() const override;
+        u64 GetTicks() const override;
+        void AddTicks(u64 ticks) override;
+        void SaveContext(Core::ThreadContext& ctx) override;
+        void LoadContext(const Core::ThreadContext& ctx) override;
+        void PrepareReschedule() override;
+private:
+        std::unique_ptr<ARMul_State> state;
+};
+
+class Jitx64Base : public JitBase, X64CodeBlock
+{
+};

src/core/arm/jit_common/jit_util.h

@@ -0,0 +1,20 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "common/x64_emitter.h"
+
+class FarCodeCache : public Gen::X64CodeBlock
+{
+private:
+        bool m_enabled = false;
+public:
+        bool Enabled() { return m_enabled; }
+        void Init() { AllocCodeSpace(size); m_enabled = true; }
+        void Shutdown() { FreeCodeSpace(); m_enabled = false; }
+};
+
+static const int CODE_SIZE = 1024 * 1024 * 32;
+static const int FARCODE_SIZE = 1024 * 1024 * 8;