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-rw-r--r--arch/arm/lib/memset.S33
1 files changed, 13 insertions, 20 deletions
diff --git a/arch/arm/lib/memset.S b/arch/arm/lib/memset.S
index d912e7397ecc..94b0650ea98f 100644
--- a/arch/arm/lib/memset.S
+++ b/arch/arm/lib/memset.S
@@ -14,31 +14,15 @@
14 14
15 .text 15 .text
16 .align 5 16 .align 5
17 .word 0
18
191: subs r2, r2, #4 @ 1 do we have enough
20 blt 5f @ 1 bytes to align with?
21 cmp r3, #2 @ 1
22 strltb r1, [ip], #1 @ 1
23 strleb r1, [ip], #1 @ 1
24 strb r1, [ip], #1 @ 1
25 add r2, r2, r3 @ 1 (r2 = r2 - (4 - r3))
26/*
27 * The pointer is now aligned and the length is adjusted. Try doing the
28 * memset again.
29 */
30 17
31ENTRY(memset) 18ENTRY(memset)
32/* 19 ands r3, r0, #3 @ 1 unaligned?
33 * Preserve the contents of r0 for the return value. 20 mov ip, r0 @ preserve r0 as return value
34 */ 21 bne 6f @ 1
35 mov ip, r0
36 ands r3, ip, #3 @ 1 unaligned?
37 bne 1b @ 1
38/* 22/*
39 * we know that the pointer in ip is aligned to a word boundary. 23 * we know that the pointer in ip is aligned to a word boundary.
40 */ 24 */
41 orr r1, r1, r1, lsl #8 251: orr r1, r1, r1, lsl #8
42 orr r1, r1, r1, lsl #16 26 orr r1, r1, r1, lsl #16
43 mov r3, r1 27 mov r3, r1
44 cmp r2, #16 28 cmp r2, #16
@@ -127,4 +111,13 @@ ENTRY(memset)
127 tst r2, #1 111 tst r2, #1
128 strneb r1, [ip], #1 112 strneb r1, [ip], #1
129 mov pc, lr 113 mov pc, lr
114
1156: subs r2, r2, #4 @ 1 do we have enough
116 blt 5b @ 1 bytes to align with?
117 cmp r3, #2 @ 1
118 strltb r1, [ip], #1 @ 1
119 strleb r1, [ip], #1 @ 1
120 strb r1, [ip], #1 @ 1
121 add r2, r2, r3 @ 1 (r2 = r2 - (4 - r3))
122 b 1b
130ENDPROC(memset) 123ENDPROC(memset)