HP gnu source-level debugger 5992-4701 manual Instruct GDB to assume the target is big-endian

set endian big	Instruct GDB to assume the target is big-endian.
set endian little	Instruct GDB to assume the target is little-endian.
set endian auto	Instruct GDB to use the byte order associated with the
	executable.
show endian	Display GDB's current idea of the target byte order.

Note that these commands merely adjust interpretation of symbolic data on the host, and that they have absolutely no effect on the target system.

136 Specifying a Debugging Target