commit d63167affc2a56189e3ba2cc47dd9a3451208b59
Author: Ulrich Weigand <ulrich.weigand@de.ibm.com>
Date:   Tue Feb 4 18:26:26 2014 +0100

    PowerPC64 little-endian fixes: structure passing
    
    When passing a small structure in a GPR, the ABI specifies that it
    should be passed in the least-significant bytes of the register
    (or stack slot).  On big-endian systems, this means the value
    needs to be stored at an offset, which is what current code does.
    
    However, on little-endian systems, the least-significant bytes are
    addresses with offset 0.  This patch fixes that.
    
    gdb/ChangeLog:
    
    	* ppc-sysv-tdep.c (ppc64_sysv_abi_push_val): Use correct
    	offset on little-endian when passing small structures.

Index: gdb-7.6.1/gdb/ppc-sysv-tdep.c
===================================================================
--- gdb-7.6.1.orig/gdb/ppc-sysv-tdep.c
+++ gdb-7.6.1/gdb/ppc-sysv-tdep.c
@@ -1149,7 +1149,8 @@ ppc64_sysv_abi_push_val (struct gdbarch
      doubleword are right-aligned and those larger are left-aligned.
      GCC versions before 3.4 implemented this incorrectly; see
      <http://gcc.gnu.org/gcc-3.4/powerpc-abi.html>.  */
-  if (len < tdep->wordsize)
+  if (len < tdep->wordsize
+      && gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG)
     offset = tdep->wordsize - len;
 
   if (argpos->regcache)