Re-add the gdb command. It was removed to be replaced by something

more generic, but that didn't actually happen. Since the feature to
switch backends (and historically this means from DDB to GDB) is
important, make sure people can do just that until such the generic
mechanism actually sees the light of day.

Suggested by: rwatson@

1 files changed, 12 insertions, 0 deletions

diff --git a/sys/ddb/db_command.c b/sys/ddb/db_command.c
index 954a0d3..30740ab 100644
--- a/sys/ddb/db_command.c
+++ b/sys/ddb/db_command.c
@@ -67,6 +67,7 @@ SET_DECLARE(db_cmd_set, struct command);
 SET_DECLARE(db_show_cmd_set, struct command);
 
 static db_cmdfcn_t	db_fncall;
+static db_cmdfcn_t	db_gdb;
 static db_cmdfcn_t	db_kill;
 static db_cmdfcn_t	db_reset;
 static db_cmdfcn_t	db_watchdog;
@@ -414,6 +415,7 @@ static struct command db_command_table[] = {
 	{ "call",	db_fncall,		CS_OWN,	0 },
 	{ "show",	0,			0,	db_show_cmds },
 	{ "ps",		db_ps,			0,	0 },
+	{ "gdb",	db_gdb,			0,	0 },
 	{ "reset",	db_reset,		0,	0 },
 	{ "kill",	db_kill,		CS_OWN,	0 },
 	{ "watchdog",	db_watchdog,		0,	0 },
@@ -611,3 +613,13 @@ db_watchdog(dummy1, dummy2, dummy3, dummy4)
 
 	EVENTHANDLER_INVOKE(watchdog_list, 0, &i);
 }
+
+static void
+db_gdb(db_expr_t dummy1, boolean_t dummy2, db_expr_t dummy3, char *dummy4)
+{
+
+	if (kdb_dbbe_select("gdb") != 0)
+		db_printf("The remote GDB backend could not be selected.\n");
+	else
+		db_printf("Step to enter the remote GDB backend.\n");
+}