Unix in a Nutshell, 4th Edition

Name

mem

Synopsis

mem start-addr end-addr attributes ...

Define a memory region, i.e., a portion of the address space starting at start-addr and ending at end-addr that has particular attributes.

Memory Access Attributes

ro	Memory is read-only.
rw	Memory is read-write.
wo	Memory is write-only.
8, 16, 32, 64	GDB should use memory accesses of the specified width in bits. This is often needed for memory-mapped device registers.