sandbox: Add -j option to indicate a jump from a previous U-Boot

In order to support the 'go' command we allow the jumping U-Boot to pass its
filename to the new U-Boot image. This can then be used to delete that image
if required.

Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Che-Liang Chiou <clchiou@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>

arch/sandbox/cpu/start.c

@@ -107,6 +107,22 @@ static int sandbox_cmdline_cb_interactive(struct sandbox_state *state,
 
 SANDBOX_CMDLINE_OPT_SHORT(interactive, 'i', 0, "Enter interactive mode");
 
+static int sandbox_cmdline_cb_jump(struct sandbox_state *state,
+				   const char *arg)
+{
+	state->jumped = 1;
+
+	/*
+	 * TODO(sjg@chromium.org): Note this causes problems for gdb which
+	 * wants to read debug data from the image.
+	 *
+	 * os_unlink(arg);
+	 */
+
+	return 0;
+}
+SANDBOX_CMDLINE_OPT_SHORT(jump, 'j', 1, "Jumped from previous U-Boot");
+
 static int sandbox_cmdline_cb_memory(struct sandbox_state *state,
 				     const char *arg)
 {

arch/sandbox/include/asm/state.h

@@ -30,7 +30,8 @@ struct sandbox_state {
 	enum exit_type_id exit_type;	/* How we exited U-Boot */
 	const char *parse_err;		/* Error to report from parsing */
 	int argc;			/* Program arguments */
-	char **argv;
+	char **argv;			/* Command line arguments */
+	bool jumped;			/* Jumped from previous U_Boot */
 	uint8_t *ram_buf;		/* Emulated RAM buffer */
 	unsigned int ram_size;		/* Size of RAM buffer */
 	const char *ram_buf_fname;	/* Filename to use for RAM buffer */