diff --git a/compiler/optimizing/code_generator_arm64.h b/compiler/optimizing/code_generator_arm64.h
index d9c49d1..584eead 100644
--- a/compiler/optimizing/code_generator_arm64.h
+++ b/compiler/optimizing/code_generator_arm64.h
@@ -70,21 +70,32 @@
 };
 static constexpr size_t kParameterFPRegistersLength = arraysize(kParameterFPRegisters);
 
-// Thread Register
+// Thread Register.
 const vixl::aarch64::Register tr = vixl::aarch64::x19;
+// Marking Register.
+const vixl::aarch64::Register mr = vixl::aarch64::x20;
 // Method register on invoke.
 static const vixl::aarch64::Register kArtMethodRegister = vixl::aarch64::x0;
 const vixl::aarch64::CPURegList vixl_reserved_core_registers(vixl::aarch64::ip0,
                                                              vixl::aarch64::ip1);
 const vixl::aarch64::CPURegList vixl_reserved_fp_registers(vixl::aarch64::d31);
 
-const vixl::aarch64::CPURegList runtime_reserved_core_registers(tr, vixl::aarch64::lr);
+const vixl::aarch64::CPURegList runtime_reserved_core_registers =
+    vixl::aarch64::CPURegList(
+        tr,
+        // Reserve X20 as Marking Register when emitting Baker read barriers.
+        ((kEmitCompilerReadBarrier && kUseBakerReadBarrier) ? mr : vixl::aarch64::NoCPUReg),
+        vixl::aarch64::lr);
 
-// Callee-saved registers AAPCS64 (without x19 - Thread Register)
-const vixl::aarch64::CPURegList callee_saved_core_registers(vixl::aarch64::CPURegister::kRegister,
-                                                            vixl::aarch64::kXRegSize,
-                                                            vixl::aarch64::x20.GetCode(),
-                                                            vixl::aarch64::x30.GetCode());
+// Callee-save registers AAPCS64, without x19 (Thread Register) (nor
+// x20 (Marking Register) when emitting Baker read barriers).
+const vixl::aarch64::CPURegList callee_saved_core_registers(
+    vixl::aarch64::CPURegister::kRegister,
+    vixl::aarch64::kXRegSize,
+    ((kEmitCompilerReadBarrier && kUseBakerReadBarrier)
+         ? vixl::aarch64::x21.GetCode()
+         : vixl::aarch64::x20.GetCode()),
+     vixl::aarch64::x30.GetCode());
 const vixl::aarch64::CPURegList callee_saved_fp_registers(vixl::aarch64::CPURegister::kFPRegister,
                                                           vixl::aarch64::kDRegSize,
                                                           vixl::aarch64::d8.GetCode(),