The debugger accesses registers and variables as $name. Register
names are as in the
show registers command. Some variables are
suffixed with numbers, and may have some modifier following a colon
immediately after the variable name. For example, register variables
t modifier to indicate user register and
that of a default target thread instead of that of the current thread
Built-in variables currently supported are:
show all threadscommand respectively. This variable is read only.
toption is specified without explicit thread structure address parameter in command lines or expression evaluation.