JitBase: Remove use of the JIT global in Dispatch() and JitTrampoline()

Trims down a few more uses of the global variable by just passing the
JIT instance we're dispatching or trampolining with as a parameter.

Source/Core/Core/PowerPC/Jit64/Jit.h

@@ -243,7 +243,7 @@ private:
   // The default code buffer. We keep it around to not have to alloc/dealloc a
   // large chunk of memory for each recompiled block.
   PPCAnalyst::CodeBuffer code_buffer;
-  Jit64AsmRoutineManager asm_routines;
+  Jit64AsmRoutineManager asm_routines{*this};
 
   bool m_enable_blr_optimization;
   bool m_cleanup_after_stackfault;

Source/Core/Core/PowerPC/Jit64/JitAsm.cpp

@@ -18,6 +18,10 @@
 
 using namespace Gen;
 
+Jit64AsmRoutineManager::Jit64AsmRoutineManager(JitBase& jit) : m_jit{jit}
+{
+}
+
 void Jit64AsmRoutineManager::Init(u8* stack_top)
 {
   m_const_pool.Init(AllocChildCodeSpace(4096), 4096);
@@ -151,6 +155,7 @@ void Jit64AsmRoutineManager::Generate()
 
   // Ok, no block, let's call the slow dispatcher
   ABI_PushRegistersAndAdjustStack({}, 0);
+  MOV(64, R(ABI_PARAM1), Imm64(reinterpret_cast<u64>(&m_jit)));
   ABI_CallFunction(JitBase::Dispatch);
   ABI_PopRegistersAndAdjustStack({}, 0);
 
@@ -175,7 +180,8 @@ void Jit64AsmRoutineManager::Generate()
   ResetStack(*this);
 
   ABI_PushRegistersAndAdjustStack({}, 0);
-  MOV(32, R(ABI_PARAM1), PPCSTATE(pc));
+  MOV(64, R(ABI_PARAM1), Imm64(reinterpret_cast<u64>(&m_jit)));
+  MOV(32, R(ABI_PARAM2), PPCSTATE(pc));
   ABI_CallFunction(JitTrampoline);
   ABI_PopRegistersAndAdjustStack({}, 0);
 

Source/Core/Core/PowerPC/Jit64/JitAsm.h

@@ -12,6 +12,8 @@ namespace Gen
 class X64CodeBlock;
 }
 
+class JitBase;
+
 // In Dolphin, we don't use inline assembly. Instead, we generate all machine-near
 // code at runtime. In the case of fixed code like this, after writing it, we write
 // protect the memory, essentially making it work just like precompiled code.
@@ -28,17 +30,21 @@ class X64CodeBlock;
 
 class Jit64AsmRoutineManager : public CommonAsmRoutines
 {
-private:
-  void Generate();
-  void GenerateCommon();
-  u8* m_stack_top;
-
 public:
   // NOTE: When making large additions to the AsmCommon code, you might
   // want to ensure this number is big enough.
   static constexpr size_t CODE_SIZE = 16384;
 
+  explicit Jit64AsmRoutineManager(JitBase& jit);
+
   void Init(u8* stack_top);
 
   void ResetStack(Gen::X64CodeBlock& emitter);
+
+private:
+  void Generate();
+  void GenerateCommon();
+
+  u8* m_stack_top = nullptr;
+  JitBase& m_jit;
 };

Source/Core/Core/PowerPC/JitArm64/JitAsm.cpp

@@ -124,6 +124,7 @@ void JitArm64::GenerateAsm()
 
   // Call C version of Dispatch().
   STR(INDEX_UNSIGNED, DISPATCHER_PC, PPC_REG, PPCSTATE_OFF(pc));
+  MOVP2R(X0, this);
   MOVP2R(X30, reinterpret_cast<void*>(&JitBase::Dispatch));
   BLR(X30);
 
@@ -141,7 +142,8 @@ void JitArm64::GenerateAsm()
   // Call JIT
   SetJumpTarget(no_block_available);
   ResetStack();
-  MOV(W0, DISPATCHER_PC);
+  MOVP2R(X0, this);
+  MOV(W1, DISPATCHER_PC);
   MOVP2R(X30, reinterpret_cast<void*>(&JitTrampoline));
   BLR(X30);
   LDR(INDEX_UNSIGNED, DISPATCHER_PC, PPC_REG, PPCSTATE_OFF(pc));

Source/Core/Core/PowerPC/JitCommon/JitBase.cpp

@@ -12,9 +12,14 @@
 
 JitBase* g_jit;
 
-void JitTrampoline(u32 em_address)
+const u8* JitBase::Dispatch(JitBase& jit)
 {
-  g_jit->Jit(em_address);
+  return jit.GetBlockCache()->Dispatch();
+}
+
+void JitTrampoline(JitBase& jit, u32 em_address)
+{
+  jit.Jit(em_address);
 }
 
 u32 Helper_Mask(u8 mb, u8 me)

Source/Core/Core/PowerPC/JitCommon/JitBase.h

@@ -116,7 +116,7 @@ public:
   JitBase();
   ~JitBase() override;
 
-  static const u8* Dispatch() { return g_jit->GetBlockCache()->Dispatch(); }
+  static const u8* Dispatch(JitBase& jit);
   virtual JitBaseBlockCache* GetBlockCache() = 0;
 
   virtual void Jit(u32 em_address) = 0;
@@ -127,7 +127,7 @@ public:
   virtual bool HandleStackFault() { return false; }
 };
 
-void JitTrampoline(u32 em_address);
+void JitTrampoline(JitBase& jit, u32 em_address);
 
 // Merged routines that should be moved somewhere better
 u32 Helper_Mask(u8 mb, u8 me);