Commit 782d491f authored by Michal Simek's avatar Michal Simek
Browse files

microblaze: Simplify logic for unaligned byte copying 



Save jump instruction for unaligned byte copying.

Signed-off-by: default avatarMichal Simek <monstr@monstr.eu>
parent c83858b3

arch/microblaze/lib/uaccess_old.S

+3 −5
Original line number Diff line number Diff line
@@ -120,11 +120,10 @@ __copy_tofrom_user: 
	 * r4 - tempval

	 */

	beqid	r7, 0f /* zero size is not likely */

	andi	r3, r7, 0x3 /* filter add count */

	bneid	r3, bu /* if is odd value then byte copying */

	or	r3, r5, r6 /* find if is any to/from unaligned */

	andi	r3, r3, 0x3 /* mask unaligned */

	bneid	r3, bu1 /* it is unaligned -> then jump */

	or	r3, r3, r7 /* find if count is unaligned */

	andi	r3, r3, 0x3 /* mask last 3 bits */

	bneid	r3, bu1 /* if r3 is not zero then byte copying */

	or	r3, r0, r0



w1:	lw	r4, r6, r3 /* at least one 4 byte copy */
@@ -141,7 +140,6 @@ w2: sw r4, r5, r3 
	.word	w2, 0f;

	.text



bu:	or	r3, r0, r0

bu1:	lbu	r4,r6,r3

bu2:	sb	r4,r5,r3

	addik	r7,r7,-1