avr32/lib: fix unaligned memcpy()

memcpy(p, unaligned, 4..) returns (p + num_of_unaligned_by_copied)
instead of p because p is not preserved in the unaligned case.

Noticed by Herbert Xu's superior parameter recycling coding technique
which let the md4 self-test fail on avr32.

Signed-off-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>

1 files changed, 12 insertions, 3 deletions

diff --git a/arch/avr32/lib/memcpy.S b/arch/avr32/lib/memcpy.S
index 0abb26142b64..93e74b6fcdb6 100644
--- a/arch/avr32/lib/memcpy.S
+++ b/arch/avr32/lib/memcpy.S
@@ -24,8 +24,8 @@ memcpy:
         brne    1f
 
         /* At this point, "from" is word-aligned */
-2:      sub     r10, 4
-        mov     r9, r12
+2:      mov     r9, r12
+5:      sub     r10, 4
         brlt    4f
 
 3:      ld.w    r8, r11++
@@ -59,4 +59,13 @@ memcpy:
         st.b    r12++, r8
         ld.ub   r8, r11++
         st.b    r12++, r8
-        rjmp    2b
+        mov     r8, r12
+        add     pc, pc, r9
+        sub     r8, 1
+        nop
+        sub     r8, 1
+        nop
+        sub     r8, 1
+        nop
+        mov     r9, r8
+        rjmp    5b