gdb.info: Byte Order

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Choosing target byte order

Some types of processors, such as the MIPS, PowerPC, and Renesas SH,
offer the ability to run either big-endian or little-endian byte
orders.  Usually the executable or symbol will include a bit to
designate the endian-ness, and you will not need to worry about which
to use.  However, you may still find it useful to adjust GDB's idea of
processor endian-ness manually.
`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.