diff --git a/src/server/gdb_server.c b/src/server/gdb_server.c
index dc14b75c83d17adf8c2c3866855246decfa8491b..44d9de8381222f8454428a8d6107d915838702f5 100644
--- a/src/server/gdb_server.c
+++ b/src/server/gdb_server.c
@@ -40,6 +40,8 @@
#define _DEBUG_GDB_IO_
#endif
+static gdb_connection_t *current_gdb_connection;
+
static int gdb_breakpoint_override;
static enum breakpoint_type gdb_breakpoint_override_type;
@@ -750,6 +752,7 @@ int gdb_new_connection(connection_t *connection)
gdb_connection->closed = 0;
gdb_connection->busy = 0;
gdb_connection->noack_mode = 0;
+ gdb_connection->sync = true;
/* send ACK to GDB for debug request */
gdb_write(connection, "+", 1);
@@ -767,30 +770,6 @@ int gdb_new_connection(connection_t *connection)
/* register callback to be informed about target events */
target_register_event_callback(gdb_target_callback_event_handler, connection);
- /* a gdb session just attached, try to put the target in halt mode.
- *
- * DANGER!!!!
- *
- * If the halt fails(e.g. target needs a reset, JTAG communication not
- * working, etc.), then the GDB connect will succeed as
- * the get_gdb_reg_list() will lie and return a register list with
- * dummy values.
- *
- * This allows GDB monitor commands to be run from a GDB init script to
- * initialize the target
- *
- * Also, since the halt() is asynchronous target connect will be
- * instantaneous and thus avoiding annoying timeout problems during
- * connect.
- */
- target_halt(gdb_service->target);
- /* FIX!!!! could extended-remote work better here?
- *
- * wait a tiny bit for halted state or we just continue. The
- * GDB register packet will then contain garbage
- */
- target_wait_state(gdb_service->target, TARGET_HALTED, 500);
-
/* remove the initial ACK from the incoming buffer */
if ((retval = gdb_get_char(connection, &initial_ack)) != ERROR_OK)
return retval;
@@ -1609,7 +1588,11 @@ int gdb_query_packet(connection_t *connection, target_t *target, char *packet, i
/* We want to print all debug output to GDB connection */
log_add_callback(gdb_log_callback, connection);
target_call_timer_callbacks_now();
+ /* some commands need to know the GDB connection, make note of current
+ * GDB connection. */
+ current_gdb_connection = gdb_connection;
command_run_line(cmd_ctx, cmd);
+ current_gdb_connection = NULL;
target_call_timer_callbacks_now();
log_remove_callback(gdb_log_callback, connection);
free(cmd);
@@ -2107,20 +2090,52 @@ int gdb_input_inner(connection_t *connection)
case 'c':
case 's':
{
- if (target->state != TARGET_HALTED)
+ int retval = ERROR_OK;
+
+ gdb_connection_t *gdb_con = connection->priv;
+ log_add_callback(gdb_log_callback, connection);
+
+ bool nostep = false;
+ if (target->state == TARGET_RUNNING)
+ {
+ LOG_WARNING("The target is already running. Halt target before stepi/continue.");
+ retval = target_halt(target);
+ if (retval == ERROR_OK)
+ retval = target_wait_state(target, TARGET_HALTED, 100);
+ } else if (target->state != TARGET_HALTED)
+ {
+ LOG_WARNING("The target is not in the halted nor running stated, stepi/continue ignored.");
+ nostep = true;
+ } else if ((packet[0] == 's') && gdb_con->sync)
+ {
+ /* Hmm..... when you issue a continue in GDB, then a "stepi" is
+ * sent by GDB first to OpenOCD, thus defeating the check to
+ * make only the single stepping have the sync feature...
+ */
+ nostep = true;
+ LOG_WARNING("stepi ignored. GDB will now fetch the register state from the target.");
+ }
+ gdb_con->sync = false;
+
+ if ((retval!=ERROR_OK) || nostep)
{
- /* If the target isn't in the halted state, then we can't
+ /* Either the target isn't in the halted state, then we can't
* step/continue. This might be early setup, etc.
+ *
+ * Or we want to allow GDB to pick up a fresh set of
+ * register values without modifying the target state.
+ *
*/
gdb_sig_halted(connection);
+
+ /* stop forwarding log packets! */
+ log_remove_callback(gdb_log_callback, connection);
} else
{
/* We're running/stepping, in which case we can
* forward log output until the target is halted
*/
- gdb_connection_t *gdb_con = connection->priv;
gdb_con->frontend_state = TARGET_RUNNING;
- log_add_callback(gdb_log_callback, connection);
target_call_event_callbacks(target, TARGET_EVENT_GDB_START);
int retval = gdb_step_continue_packet(connection, target, packet, packet_size);
if (retval != ERROR_OK)
@@ -2255,6 +2270,25 @@ int gdb_init(void)
return ERROR_OK;
}
+int handle_gdb_sync_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
+{
+ if (argc != 0)
+ {
+ return ERROR_COMMAND_SYNTAX_ERROR;
+ }
+
+ if (current_gdb_connection == NULL)
+ {
+ command_print(cmd_ctx,
+ "gdb_sync command can only be run from within gdb using \"monitor gdb_sync\"");
+ return ERROR_FAIL;
+ }
+
+ current_gdb_connection->sync = true;
+
+ return ERROR_OK;
+}
+
/* daemon configuration command gdb_port */
int handle_gdb_port_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
{
@@ -2399,6 +2433,8 @@ int handle_gdb_breakpoint_override_command(struct command_context_s *cmd_ctx, ch
int gdb_register_commands(command_context_t *command_context)
{
+ register_command(command_context, NULL, "gdb_sync", handle_gdb_sync_command,
+ COMMAND_ANY, "next stepi will return immediately allowing GDB fetch register state without affecting target state");
register_command(command_context, NULL, "gdb_port", handle_gdb_port_command,
COMMAND_ANY, "daemon configuration command gdb_port");
register_command(command_context, NULL, "gdb_detach", handle_gdb_detach_command,
diff --git a/src/server/gdb_server.h b/src/server/gdb_server.h
index fb4cdbab6becf713d84aab1218a02d4c8f221f65..ea981f31640f1fd12b9c7d60100f651bced6ec1e 100644
--- a/src/server/gdb_server.h
+++ b/src/server/gdb_server.h
@@ -43,6 +43,10 @@ typedef struct gdb_connection_s
int closed;
int busy;
int noack_mode;
+ bool sync; /* set flag to true if you want the next stepi to return immediately.
+ allowing GDB to pick up a fresh set of register values from the target
+ without modifying the target state. */
+
} gdb_connection_t;
typedef struct gdb_service_s