Impl emulator stepping with GDB

1 files changed, 60 insertions, 0 deletions

diff --git a/m68k_debugging.hpp b/m68k_debugging.hpp
new file mode 100644
index 0000000..4892493
--- /dev/null
+++ b/m68k_debugging.hpp
@@ -0,0 +1,60 @@
+/* SPDX-License-Identifier: Unlicense
+ */
+
+#pragma once
+
+#include <cstdint>
+#include <cstddef>
+
+enum class M68KRegister: size_t {
+    kD0 = 0,
+    kD1 = 1,
+    kD2 = 2,
+    kD3 = 3,
+    kD4 = 4,
+    kD5 = 5,
+    kD6 = 6,
+    kD7 = 7,
+    kA0 = 8,
+    kA1 = 9,
+    kA2 = 10,
+    kA3 = 11,
+    kA4 = 12,
+    kA5 = 13,
+    kA6 = 14,           /* Address of executing stack frame  */
+    kFP = kA6,
+    kA7 = 15,           /* Address of top of stack (Stack pointer)  */
+    kSP = kA7,
+    kPS = 16,           /* Processor status (Condition code register)  */
+    kPC = 17,           /* Program counter  */
+    kFP0 = 18,          /* Floating point register 0  */
+    kFPC = 26,          /* 68881 control register  */
+    kFPS = 27,          /* 68881 status register  */
+    kFPI = 28,          /* Floating point register 1  */
+    kRegistersCount,
+};
+
+struct M68KCPUState {
+    size_t registers_count{};
+    uint32_t registers[static_cast<size_t>(M68KRegister::kRegistersCount)]{};
+};
+
+class M68KDebuggingControl {
+public:
+    M68KDebuggingControl() = default;
+    uint32_t GetRegister(M68KRegister) const;
+    M68KCPUState GetCPUState() const;
+    void SetRegister(M68KRegister, uint32_t value);
+    void Reset();
+    void Continue();
+    void Pause();
+    uint8_t Read8(uint32_t address) const;
+    uint16_t Read16(uint32_t address) const;
+    uint32_t Read32(uint32_t address) const;
+    void Write8(uint32_t address, uint8_t value);
+    void Write16(uint32_t address, uint16_t value);
+    void Write32(uint32_t address, uint32_t value);
+private:
+    M68KDebuggingControl(M68KDebuggingControl&&) = delete;
+    M68KDebuggingControl(const M68KDebuggingControl&) = delete;
+};