Initial port of luma3ds' gdb_hio to Citra

src/core/gdbstub/hio.h

@@ -0,0 +1,32 @@
+#pragma once
+
+#include "common/common_types.h"
+
+namespace GDBStub {
+
+struct PackedGdbHioRequest {
+    char magic[4]; // "GDB\x00"
+    u32 version;
+
+    // Request
+    char function_name[16 + 1];
+    char param_format[8 + 1];
+
+    u64 parameters[8];
+    size_t string_lengths[8];
+
+    // Return
+    s64 retval;
+    int gdb_errno;
+    bool ctrl_c;
+};
+
+void SetHioRequest(const VAddr address);
+
+bool HandleHioRequest(const u8* const command_buffer, const u32 command_length);
+
+bool HasHioRequest();
+
+std::string BuildHioReply();
+
+} // namespace GDBStub