Complex relocs

[Etienne Bergeron <etienne dot bergeron at octasic dot com>]

I just read this post on the mailing related to the complex relocations added in the elf32-mep.c in 2007.
 
	http://cygwin.ru/ml/binutils/2007-09/msg00440.html


I see some limitation for our cases.

	1) The type is applied on the "reloc" (RELC/SRELC) and not on the "operator". 
         	- Thus, it is not possible to have both signed and unsigned arithmetic within the same reloc.

	2) The way symbols_resolve(elflink.c) works hide a potential bug,

	3) and is inefficient for lots of complex relocs O(n2)
		- The symbols are represented as "string" instead of "ndx" in the symbols table


An example of a potential bug:
------------------------------

static int x;
int y;

int foo()
{
  extern int x;
  static int delta = (&x-&y);  <<-- complex reloc, but which "x" to use (local/global)?!  (in the implementation, local)
  [...]
}

I think "resolve_symbol" should be back-end specific, and "binutils" may provide a default one.

Also, I think backend should provide a "decode_symbol" function for pretty-printing a symbol when using objdump -t or readelf -s.

-- 
Etienne Bergeron
http://www.octasic.com