commit 52f548e41f085550d7740c350c1c8a239532af77
Author: Ulrich Weigand <ulrich.weigand@de.ibm.com>
Date:   Tue Feb 4 18:41:36 2014 +0100

    PowerPC64 ELFv2 ABI: stack frame layout changes
    
    This implementes another change in ELFv2: the stack frame no longer
    contains the reserved double words for linker and compiler use
    (which weren't really used for much of anything anyway).  This
    affects placement of on-stack parameters in inferior calls.
    
    gdb/ChangeLog:
    
    	* ppc-sysv-tdep.c (ppc64_sysv_abi_push_dummy_call): Use correct
    	offset to the stack parameter list for the ELFv2 ABI.

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
@@ -1473,9 +1473,13 @@ ppc64_sysv_abi_push_dummy_call (struct g
 	  argpos.regcache = regcache;
 	  argpos.refparam = align_down (sp - refparam_size, 16);
 	  argpos.gparam = align_down (argpos.refparam - gparam_size, 16);
-	  /* Add in space for the TOC, link editor double word,
-	     compiler double word, LR save area, CR save area.  */
-	  sp = align_down (argpos.gparam - 48, 16);
+	  /* Add in space for the TOC, link editor double word (v1 only),
+	     compiler double word (v1 only), LR save area, CR save area,
+	     and backchain.  */
+	  if (tdep->elf_abi == POWERPC_ELF_V1)
+	    sp = align_down (argpos.gparam - 48, 16);
+	  else
+	    sp = align_down (argpos.gparam - 32, 16);
 	}
 
       /* If the function is returning a `struct', then there is an