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Paul Mackerras70d64ce2005-10-10 21:52:43 +10001/*
2 * String handling functions for PowerPC.
3 *
4 * Copyright (C) 1996 Paul Mackerras.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11#include <asm/processor.h>
12#include <asm/errno.h>
13#include <asm/ppc_asm.h>
14
15_GLOBAL(memset)
16 neg r0,r3
17 rlwimi r4,r4,8,16,23
18 andi. r0,r0,7 /* # bytes to be 8-byte aligned */
19 rlwimi r4,r4,16,0,15
20 cmplw cr1,r5,r0 /* do we get that far? */
21 rldimi r4,r4,32,0
Anton Blanchard694caf02012-04-18 02:21:52 +000022 PPC_MTOCRF(1,r0)
Paul Mackerras70d64ce2005-10-10 21:52:43 +100023 mr r6,r3
24 blt cr1,8f
25 beq+ 3f /* if already 8-byte aligned */
26 subf r5,r0,r5
27 bf 31,1f
28 stb r4,0(r6)
29 addi r6,r6,1
301: bf 30,2f
31 sth r4,0(r6)
32 addi r6,r6,2
332: bf 29,3f
34 stw r4,0(r6)
35 addi r6,r6,4
363: srdi. r0,r5,6
37 clrldi r5,r5,58
38 mtctr r0
39 beq 5f
404: std r4,0(r6)
41 std r4,8(r6)
42 std r4,16(r6)
43 std r4,24(r6)
44 std r4,32(r6)
45 std r4,40(r6)
46 std r4,48(r6)
47 std r4,56(r6)
48 addi r6,r6,64
49 bdnz 4b
505: srwi. r0,r5,3
51 clrlwi r5,r5,29
Anton Blanchard694caf02012-04-18 02:21:52 +000052 PPC_MTOCRF(1,r0)
Paul Mackerras70d64ce2005-10-10 21:52:43 +100053 beq 8f
54 bf 29,6f
55 std r4,0(r6)
56 std r4,8(r6)
57 std r4,16(r6)
58 std r4,24(r6)
59 addi r6,r6,32
606: bf 30,7f
61 std r4,0(r6)
62 std r4,8(r6)
63 addi r6,r6,16
647: bf 31,8f
65 std r4,0(r6)
66 addi r6,r6,8
678: cmpwi r5,0
Anton Blanchard694caf02012-04-18 02:21:52 +000068 PPC_MTOCRF(1,r5)
Paul Mackerras70d64ce2005-10-10 21:52:43 +100069 beqlr+
70 bf 29,9f
71 stw r4,0(r6)
72 addi r6,r6,4
739: bf 30,10f
74 sth r4,0(r6)
75 addi r6,r6,2
7610: bflr 31
77 stb r4,0(r6)
78 blr
79
80_GLOBAL(memmove)
81 cmplw 0,r3,r4
82 bgt .backwards_memcpy
83 b .memcpy
84
85_GLOBAL(backwards_memcpy)
86 rlwinm. r7,r5,32-3,3,31 /* r0 = r5 >> 3 */
87 add r6,r3,r5
88 add r4,r4,r5
89 beq 2f
90 andi. r0,r6,3
91 mtctr r7
92 bne 5f
931: lwz r7,-4(r4)
94 lwzu r8,-8(r4)
95 stw r7,-4(r6)
96 stwu r8,-8(r6)
97 bdnz 1b
98 andi. r5,r5,7
992: cmplwi 0,r5,4
100 blt 3f
101 lwzu r0,-4(r4)
102 subi r5,r5,4
103 stwu r0,-4(r6)
1043: cmpwi 0,r5,0
105 beqlr
106 mtctr r5
1074: lbzu r0,-1(r4)
108 stbu r0,-1(r6)
109 bdnz 4b
110 blr
1115: mtctr r0
1126: lbzu r7,-1(r4)
113 stbu r7,-1(r6)
114 bdnz 6b
115 subf r5,r0,r5
116 rlwinm. r7,r5,32-3,3,31
117 beq 2b
118 mtctr r7
119 b 1b