* ptrace-target.h, ptrace-target.c (ptrace_write_user)

	* ptrace-target.h, ptrace-target.c (ptrace_write_user)
	(ptrace_read_user): Add struct gdbserv argument.
	* linux-target.c: Fix all callers (and callers of callers).
	* ptrace-target.c (ptrace_write_user, ptrace_read_user): Add
	debugging printf()s.
	(ptrace_xfer_mem): Fix debugging printf()s so that they'll print
	useful results when sizeof (long long) is the same as
	sizeof (ptrace_xfer_type).
	(ptrace_xfer_mem): Decode address using gdbserv_host_bytes_from_reg()
	instead of gdbserv_reg_to_ulong().