Avoid using SIZEOF to compute output section LMAs, it doesn't mix well

with orphaned sections like link_set_*.  Per discussion with Jason
Thorpe <thorpej@netbsd> on tech-toolchain.

Addresses kern/21844.

sys/arch/netwinder/conf/kern.ldscript

@@ -1,4 +1,4 @@
-/*	$NetBSD: kern.ldscript,v 1.2 2002/04/11 21:48:46 thorpej Exp $	*/
+/*	$NetBSD: kern.ldscript,v 1.3 2003/06/11 21:49:40 uwe Exp $	*/
 
 OUTPUT_FORMAT("elf32-littlearm", "elf32-bigarm",
 	      "elf32-littlearm")
@@ -32,14 +32,14 @@ SECTIONS
      boundary.  */
   . = ALIGN(0x8000);
   .data    :
-  AT ((LOADADDR(.text) + SIZEOF(.text) + (0x8000 - 1)) & ~(0x8000 - 1))
+  AT (LOADADDR(.text) + (ADDR(.data) - ADDR(.text)))
   {
     __data_start = . ;
     *(.data)
     *(.data.*)
   }
-  .sdata     : 
-  AT (LOADADDR(.data) + SIZEOF(.data))
+  .sdata     :
+  AT (LOADADDR(.data) + (ADDR(.sdata) - ADDR(.data)))
   {
     *(.sdata) 
     *(.sdata.*)