Use targ_size=64 and targ_extra_size=32
targ_big_endian=false
targ_extra_big_endian=true
;;
+mips64*el-*-*)
+ targ_obj=mips
+ targ_machine=EM_MIPS
+ targ_size=64
+ targ_extra_size=32
+ targ_big_endian=false
+ targ_extra_big_endian=true
+ ;;
mips*el-*-*)
targ_obj=mips
targ_machine=EM_MIPS
targ_big_endian=false
targ_extra_big_endian=true
;;
+mips64*-*-*)
+ targ_obj=mips
+ targ_machine=EM_MIPS
+ targ_size=64
+ targ_extra_size=32
+ targ_big_endian=true
+ targ_extra_little_endian=true
+ ;;
mips*-*-*)
targ_obj=mips
targ_machine=EM_MIPS