debug.gdb: update with userland helpers

debug.gdb

@@ -10,12 +10,20 @@ gef-remote --qemu-user localhost 1234
 # Any break points should be set here.
 break enter_userland
 commands
+	# NOTE: breakpoints on userland functions should be defined here!
+
 	# TODO: hard-coded userland entrypoint. But _sooo_ good for debugging.
 	add-symbol-file bin/userland.elf 0xa0300000+0x30
-	break elf_userland
+
+	# break elf_userland
+	# Good tool when you want to relinquish control back to GDB from source.
+	break debug_interrupt
+
 	continue
 end
-break syscall_landing_pad
 
 # Run until the program first breakpoint.
 continue
+
+# Handy way to debug the userland callstack.
+# hexdump byte 0xa0200ff0 --size 0x100 --reverse