Fix breakpoints, implement step

include/server.h

@@ -6,6 +6,12 @@
 #include <stdbool.h>
 #include <vb.h>
 
+typedef enum rdb_server_state_t {
+    state_stopped,
+    state_running,
+    state_stepping
+} rdb_server_state_t;
+
 typedef enum rdb_server_stop_reason_t {
     /* not even stopped */
     stop_reason_none,
@@ -22,13 +28,14 @@ typedef enum rdb_server_stop_reason_t {
 #define RDB_SERVER_MAX_BREAKPOINTS 16
 typedef struct RdbServer {
     VB *sim;
-    bool running;
     uint32_t brks[RDB_SERVER_MAX_BREAKPOINTS];
     uint32_t brkslen;
+    rdb_server_state_t state;
     rdb_server_stop_reason_t stopreason;
 } RdbServer;
 
 void rdbServerInit(RdbServer *srv, VB *sim);
+bool rdbServerIsRunning(RdbServer *srv);
 int rdbServerHandleCommand(RdbServer *srv, CommandBuf *cmd, RdbResponse *res);
 int rdbServerSendStopPacket(RdbServer *srv, RdbResponse *res);