diff options
Diffstat (limited to 'arch/powerpc/boot/string.S')
| -rw-r--r-- | arch/powerpc/boot/string.S | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/arch/powerpc/boot/string.S b/arch/powerpc/boot/string.S index b1eeaed7db1..ac3d43b6a32 100644 --- a/arch/powerpc/boot/string.S +++ b/arch/powerpc/boot/string.S @@ -107,10 +107,12 @@ memcpy: rlwinm. r7,r5,32-3,3,31 /* r7 = r5 >> 3 */ addi r6,r3,-4 addi r4,r4,-4 - beq 2f /* if less than 8 bytes to do */ + beq 3f /* if less than 8 bytes to do */ andi. r0,r6,3 /* get dest word aligned */ mtctr r7 bne 5f + andi. r0,r4,3 /* check src word aligned too */ + bne 3f 1: lwz r7,4(r4) lwzu r8,8(r4) stw r7,4(r6) @@ -132,6 +134,11 @@ memcpy: bdnz 4b blr 5: subfic r0,r0,4 + cmpw cr1,r0,r5 + add r7,r0,r4 + andi. r7,r7,3 /* will source be word-aligned too? */ + ble cr1,3b + bne 3b /* do byte-by-byte if not */ mtctr r0 6: lbz r7,4(r4) addi r4,r4,1 @@ -149,10 +156,12 @@ backwards_memcpy: rlwinm. r7,r5,32-3,3,31 /* r7 = r5 >> 3 */ add r6,r3,r5 add r4,r4,r5 - beq 2f + beq 3f andi. r0,r6,3 mtctr r7 bne 5f + andi. r0,r4,3 + bne 3f 1: lwz r7,-4(r4) lwzu r8,-8(r4) stw r7,-4(r6) @@ -171,7 +180,12 @@ backwards_memcpy: stbu r0,-1(r6) bdnz 4b blr -5: mtctr r0 +5: cmpw cr1,r0,r5 + subf r7,r0,r4 + andi. r7,r7,3 + ble cr1,3b + bne 3b + mtctr r0 6: lbzu r7,-1(r4) stbu r7,-1(r6) bdnz 6b |