diff --git a/src/debug.cpp b/src/debug.cpp
index dbfadf0..3f04e3c 100644
--- a/src/debug.cpp
+++ b/src/debug.cpp
@@ -203,15 +203,18 @@ bool GDBStub::parse_memory_request(const std::string &packet, size_t &addr,
 std::string GDBStub::read_registers() {
   std::ostringstream out;
   for (int i = 0; i < 32; ++i) {
-    out << std::string(8, '0');  // TODO: stub
+    out << std::hex << std::setfill('0') << std::setw(8) << vm.read_register(i);
   }
   return out.str();
 }
 
 std::string GDBStub::read_memory(size_t addr, size_t length) {
   std::ostringstream out;
+  std::vector<uint8_t> mem = vm.read_memory(addr, length);
   for (size_t i = 0; i < length; ++i) {
-    out << "00";  // TODO: stub
+    out << std::hex << std::setfill('0') << std::setw(2)
+        << (unsigned int)mem[i];
+    out.flush();
   }
   return out.str();
 }