svn commit: r234908 - head/sys/boot/arm/uboot

[Tim Kientzle]

Author: kientzle
Date: Wed May  2 05:49:58 2012
New Revision: 234908
URL: http://svn.freebsd.org/changeset/base/234908

Log:
  Remove some redundant register loads.
  
  Discussed on:		arm@

Modified:
  head/sys/boot/arm/uboot/start.S

Modified: head/sys/boot/arm/uboot/start.S
==============================================================================
--- head/sys/boot/arm/uboot/start.S	Wed May  2 04:51:43 2012	(r234907)
+++ head/sys/boot/arm/uboot/start.S	Wed May  2 05:49:58 2012	(r234908)
@@ -49,27 +49,20 @@ _start:
  * syscall()
  */
 ENTRY(syscall)
-	/* Save caller's lr */
+	/* Save caller's lr and r8 */
 	ldr	ip, =saved_regs
 	str	lr, [ip, #4]
-	/* Save loader's r8 */
-	ldr	ip, =saved_regs
 	str	r8, [ip, #8]
-
 	/* Restore U-Boot's r8 */
-	ldr	ip, =saved_regs
 	ldr	r8, [ip, #0]
 	/* Call into U-Boot */
 	ldr	lr, =return_from_syscall
 	ldr	ip, =syscall_ptr
 	ldr	pc, [ip]
-
 return_from_syscall:
-	/* Restore loader's r8 */
+	/* Restore loader's r8 and lr */
 	ldr	ip, =saved_regs
 	ldr	r8, [ip, #8]
-	/* Restore caller's lr */
-	ldr	ip, =saved_regs
 	ldr	lr, [ip, #4]
 	/* Return to caller */
 	mov	pc, lr