The attached patch has been checked in to binutils by Jim Wilson.  It fixes a 
problem with the ia64 vDSO so that gdb can backtrace from system calls.  I need 
this to check in an ia64/libunwind patch that fixes backtracing through 
syscalls.  I didn't know if one could just check in upstream bfd patches without 
approval so I will ask.  May I commit this?

Without the patch, the bfd_from_remote_memory call sets a bogus address for 
loadbase and symbol_file_add_from_memory fails.

See http://sourceware.org/ml/binutils/2005-05/msg00725.html for the patch and 
references to the discussion

2005-05-31  James E Wilson  <wilson@specifixinc.com>

	* elfcode.h (NAME(bfd_elf,bfd_from_remote_memory)): Check for program
	header PF_R flag on PT_LOAD segments.