toolchain: add new debugging tool using magenta_debug

toolchain/mxdbg/client/info.c

@@ -0,0 +1,37 @@
+#include "command.h"
+
+#include <stdio.h>
+
+extern const struct command cmd_info_kernel;
+
+static const struct command *commands[] = {
+	&cmd_info_kernel,
+};
+static const size_t nr_commands = sizeof commands / sizeof commands[0];
+
+static int info(
+	const struct command *cmd,
+	struct debug_context *ctx,
+	int argc,
+	const char **argv,
+	void *argp)
+{
+	if (argc < 1) {
+		printf("query information about the system\n");
+		return 0;
+	}
+
+	const struct command *subcmd
+		= command_find(commands, nr_commands, argv[0]);
+	if (!subcmd) {
+		return -1;
+	}
+
+	command_execute(subcmd, ctx, argc - 1, argv + 1, argp);
+	return 0;
+}
+
+const struct command cmd_info = {
+	.cmd_name = "info",
+	.cmd_callback = info,
+};