The attached is a patch for the file gdb-6.4/gdb/rs6000-tdep.c.

The problem: The register definitions for the e500 assume only 4 bytes 
per floating-point register but the gdbserver assumes 8 bytes per 
floating-point register.

Changelog
rs6000-tdep.c (registers_e500[]): Use COMMON_UISA_REGS to define general 
purpose, floating-point, pc, and ps registers.