gdbstub: drop gdbserver_cleanup in favour of gdb_exit

Despite it's name it didn't actually clean-up so let us document
gdb_exit() better and use that.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20210108224256.2321-9-alex.bennee@linaro.org>

gdbstub.c

@@ -3547,13 +3547,6 @@ int gdbserver_start(const char *device)
     return 0;
 }
 
-void gdbserver_cleanup(void)
-{
-    if (gdbserver_state.init) {
-        put_packet("W00");
-    }
-}
-
 static void register_types(void)
 {
     type_register_static(&char_gdb_type_info);

include/exec/gdbstub.h

@@ -46,7 +46,17 @@ void gdb_do_syscall(gdb_syscall_complete_cb cb, const char *fmt, ...);
 void gdb_do_syscallv(gdb_syscall_complete_cb cb, const char *fmt, va_list va);
 int use_gdb_syscalls(void);
 void gdb_set_stop_cpu(CPUState *cpu);
-void gdb_exit(int);
+
+/**
+ * gdb_exit: exit gdb session, reporting inferior status
+ * @code: exit code reported
+ *
+ * This closes the session and sends a final packet to GDB reporting
+ * the exit status of the program. It also cleans up any connections
+ * detritus before returning.
+ */
+void gdb_exit(int code);
+
 #ifdef CONFIG_USER_ONLY
 /**
  * gdb_handlesig: yield control to gdb
@@ -187,8 +197,6 @@ static inline uint8_t * gdb_get_reg_ptr(GByteArray *buf, int len)
  */
 int gdbserver_start(const char *port_or_device);
 
-void gdbserver_cleanup(void);
-
 /**
  * gdb_has_xml:
  * This is an ugly hack to cope with both new and old gdb.

softmmu/runstate.c

@@ -775,7 +775,7 @@ void qemu_init_subsystems(void)
 
 void qemu_cleanup(void)
 {
-    gdbserver_cleanup();
+    gdb_exit(0);
 
     /*
      * cleaning up the migration object cancels any existing migration