binfmt: Add a configuration flag to store the module filename

This flag can be used to store the filename of a loaded module or
executable in binfmt. The filename is useful for example in debugging.
For example, gdb or a jtag debugger can be configured to automatically
fetch the symbols for the currently executing module.

Signed-off-by: Jukka Laitinen <jukka.laitinen@tii.ae>

binfmt/Kconfig

@@ -89,3 +89,9 @@ config BINFMT_ELF_EXECUTABLE
 		Produce a full linked executable object as output.
 
 endchoice
+
+config BINFMT_STORE_FILENAME
+	bool "Store the binary filename"
+	default n
+	---help---
+		Store the filename of the loaded binary

binfmt/binfmt_loadmodule.c

@@ -122,6 +122,12 @@ static int load_absmodule(FAR struct binary_s *bin, FAR const char *filename,
 
           binfo("Successfully loaded module %s\n", filename);
 
+          /* Save the filename of the loaded module */
+
+#ifdef CONFIG_BINFMT_STORE_FILENAME
+          strlcpy(bin->fname, filename, sizeof(bin->fname));
+#endif
+
           /* Save the unload method for use by unload_module */
 
           bin->unload = binfmt->unload;

include/nuttx/binfmt/binfmt.h

@@ -96,6 +96,11 @@ struct binary_s
 
   uint8_t priority;                    /* Task execution priority */
   size_t stacksize;                    /* Size of the stack in bytes (unallocated) */
+
+#ifdef CONFIG_BINFMT_STORE_FILENAME
+  char fname[NAME_MAX];
+#endif
+
 #ifdef CONFIG_SCHED_USER_IDENTITY
   uid_t uid;                           /* File owner user identity */
   gid_t gid;                           /* File owner group user identity */