From: Bodo Stroesser <bstroesser@fujitsu-siemens.com>

This implements checking for the new ptrace option SYSEMU_SINGLESTEP
(advanced sysemu) and allows the values 0,1,2 for /proc/sysemu,
if advanced sysemu is available:
   0 = don't use sysemu
   1 = use sysemu, but don't use advanced sysemu
   2 = use sysemu and advanced sysemu
Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>