A module's memory layout is shown through an object, struct module_layout, defined in <linux/module.h>:

struct module_layout {
        /* The actual code + data. */
        void *base;
        /* Total size. */
        unsigned int size;
        /* The size of the executable code.  */
        unsigned int text_size;
        /* Size of RO section of the module (text+rodata) */
        unsigned int ro_size;

#ifdef CONFIG_MODULES_TREE_LOOKUP
        struct mod_tree_node mtn;
#endif
};