CPU/Recompiler: Exit block early on DCIC/BPCM change

Fixes booting Xplorer cartridge with recompiler.

src/core/cpu_recompiler.h

@@ -105,6 +105,8 @@ protected:
     FLUSH_FOR_BRANCH = (FLUSH_FLUSH_MIPS_REGISTERS),
     FLUSH_FOR_EXCEPTION =
       (FLUSH_CYCLES | FLUSH_GTE_DONE_CYCLE), // GTE cycles needed because it stalls when a GTE instruction is next.
+    FLUSH_FOR_EARLY_BLOCK_EXIT =
+      (FLUSH_FLUSH_MIPS_REGISTERS | FLUSH_CYCLES | FLUSH_GTE_DONE_CYCLE | FLUSH_PC | FLUSH_LOAD_DELAY),
     FLUSH_FOR_INTERPRETER = (FLUSH_FLUSH_MIPS_REGISTERS | FLUSH_INVALIDATE_MIPS_REGISTERS |
                              FLUSH_FREE_CALLER_SAVED_REGISTERS | FLUSH_PC | FLUSH_CYCLES | FLUSH_INSTRUCTION_BITS |
                              FLUSH_LOAD_DELAY | FLUSH_GTE_DONE_CYCLE | FLUSH_INVALIDATE_SPECULATIVE_CONSTANTS),

src/core/cpu_recompiler_arm32.cpp

@@ -2286,11 +2286,17 @@ void CPU::ARM32Recompiler::Compile_mtc0(CompileFlags cf)
     armAsm->ldr(RARG1, PTR(&g_state.cop0_regs.sr.bits));
     TestInterrupts(RARG1);
   }
-
-  if (reg == Cop0Reg::DCIC && g_settings.cpu_recompiler_memory_exceptions)
+  else if (reg == Cop0Reg::DCIC || reg == Cop0Reg::BPCM)
   {
-    // TODO: DCIC handling for debug breakpoints
-    WARNING_LOG("TODO: DCIC handling for debug breakpoints");
+    // need to check whether we're switching to debug mode
+    Flush(FLUSH_FOR_C_CALL);
+    EmitCall(reinterpret_cast<const void*>(&CPU::UpdateDebugDispatcherFlag));
+    SwitchToFarCodeIfRegZeroOrNonZero(RRET, true);
+    BackupHostState();
+    Flush(FLUSH_FOR_EARLY_BLOCK_EXIT);
+    EmitCall(reinterpret_cast<const void*>(&CPU::ExitExecution)); // does not return
+    RestoreHostState();
+    SwitchToNearCode(false);
   }
 }
 

src/core/cpu_recompiler_arm64.cpp

@@ -2443,11 +2443,17 @@ void CPU::ARM64Recompiler::Compile_mtc0(CompileFlags cf)
     armAsm->ldr(RWARG1, PTR(&g_state.cop0_regs.sr.bits));
     TestInterrupts(RWARG1);
   }
-
-  if (reg == Cop0Reg::DCIC && g_settings.cpu_recompiler_memory_exceptions)
+  else if (reg == Cop0Reg::DCIC || reg == Cop0Reg::BPCM)
   {
-    // TODO: DCIC handling for debug breakpoints
-    WARNING_LOG("TODO: DCIC handling for debug breakpoints");
+    // need to check whether we're switching to debug mode
+    Flush(FLUSH_FOR_C_CALL);
+    EmitCall(reinterpret_cast<const void*>(&CPU::UpdateDebugDispatcherFlag));
+    SwitchToFarCodeIfRegZeroOrNonZero(RWRET, true);
+    BackupHostState();
+    Flush(FLUSH_FOR_EARLY_BLOCK_EXIT);
+    EmitCall(reinterpret_cast<const void*>(&CPU::ExitExecution)); // does not return
+    RestoreHostState();
+    SwitchToNearCode(false);
   }
 }
 

src/core/cpu_recompiler_riscv64.cpp

@@ -2300,11 +2300,17 @@ void CPU::RISCV64Recompiler::Compile_mtc0(CompileFlags cf)
     rvAsm->LW(RARG1, PTR(&g_state.cop0_regs.sr.bits));
     TestInterrupts(RARG1);
   }
-
-  if (reg == Cop0Reg::DCIC && g_settings.cpu_recompiler_memory_exceptions)
+  else if (reg == Cop0Reg::DCIC || reg == Cop0Reg::BPCM)
   {
-    // TODO: DCIC handling for debug breakpoints
-    WARNING_LOG("TODO: DCIC handling for debug breakpoints");
+    // need to check whether we're switching to debug mode
+    Flush(FLUSH_FOR_C_CALL);
+    EmitCall(reinterpret_cast<const void*>(&CPU::UpdateDebugDispatcherFlag));
+    SwitchToFarCode(true, &Assembler::BEQ, RRET, zero);
+    BackupHostState();
+    Flush(FLUSH_FOR_EARLY_BLOCK_EXIT);
+    EmitCall(reinterpret_cast<const void*>(&CPU::ExitExecution)); // does not return
+    RestoreHostState();
+    SwitchToNearCode(false);
   }
 }
 

src/core/cpu_recompiler_x64.cpp

@@ -2259,11 +2259,18 @@ void CPU::X64Recompiler::Compile_mtc0(CompileFlags cf)
     cg->mov(RWARG1, cg->dword[PTR(&g_state.cop0_regs.sr.bits)]);
     TestInterrupts(RWARG1);
   }
-
-  if (reg == Cop0Reg::DCIC && g_settings.cpu_recompiler_memory_exceptions)
+  else if (reg == Cop0Reg::DCIC || reg == Cop0Reg::BPCM)
   {
-    // TODO: DCIC handling for debug breakpoints
-    WARNING_LOG("TODO: DCIC handling for debug breakpoints");
+    // need to check whether we're switching to debug mode
+    Flush(FLUSH_FOR_C_CALL);
+    cg->call(&CPU::UpdateDebugDispatcherFlag);
+    cg->test(cg->al, cg->al);
+    SwitchToFarCode(true, &Xbyak::CodeGenerator::jnz);
+    BackupHostState();
+    Flush(FLUSH_FOR_EARLY_BLOCK_EXIT);
+    cg->call(&CPU::ExitExecution); // does not return
+    RestoreHostState();
+    SwitchToNearCode(false);
   }
 }