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70d64cea PM |
1 | /* |
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> | |
9445aa1a | 14 | #include <asm/export.h> |
70d64cea PM |
15 | |
16 | _GLOBAL(memset) | |
17 | neg r0,r3 | |
18 | rlwimi r4,r4,8,16,23 | |
19 | andi. r0,r0,7 /* # bytes to be 8-byte aligned */ | |
20 | rlwimi r4,r4,16,0,15 | |
21 | cmplw cr1,r5,r0 /* do we get that far? */ | |
22 | rldimi r4,r4,32,0 | |
694caf02 | 23 | PPC_MTOCRF(1,r0) |
70d64cea PM |
24 | mr r6,r3 |
25 | blt cr1,8f | |
26 | beq+ 3f /* if already 8-byte aligned */ | |
27 | subf r5,r0,r5 | |
28 | bf 31,1f | |
29 | stb r4,0(r6) | |
30 | addi r6,r6,1 | |
31 | 1: bf 30,2f | |
32 | sth r4,0(r6) | |
33 | addi r6,r6,2 | |
34 | 2: bf 29,3f | |
35 | stw r4,0(r6) | |
36 | addi r6,r6,4 | |
37 | 3: srdi. r0,r5,6 | |
38 | clrldi r5,r5,58 | |
39 | mtctr r0 | |
40 | beq 5f | |
12ab11a2 | 41 | .balign 16 |
70d64cea PM |
42 | 4: std r4,0(r6) |
43 | std r4,8(r6) | |
44 | std r4,16(r6) | |
45 | std r4,24(r6) | |
46 | std r4,32(r6) | |
47 | std r4,40(r6) | |
48 | std r4,48(r6) | |
49 | std r4,56(r6) | |
50 | addi r6,r6,64 | |
51 | bdnz 4b | |
52 | 5: srwi. r0,r5,3 | |
53 | clrlwi r5,r5,29 | |
694caf02 | 54 | PPC_MTOCRF(1,r0) |
70d64cea PM |
55 | beq 8f |
56 | bf 29,6f | |
57 | std r4,0(r6) | |
58 | std r4,8(r6) | |
59 | std r4,16(r6) | |
60 | std r4,24(r6) | |
61 | addi r6,r6,32 | |
62 | 6: bf 30,7f | |
63 | std r4,0(r6) | |
64 | std r4,8(r6) | |
65 | addi r6,r6,16 | |
66 | 7: bf 31,8f | |
67 | std r4,0(r6) | |
68 | addi r6,r6,8 | |
69 | 8: cmpwi r5,0 | |
694caf02 | 70 | PPC_MTOCRF(1,r5) |
70d64cea PM |
71 | beqlr+ |
72 | bf 29,9f | |
73 | stw r4,0(r6) | |
74 | addi r6,r6,4 | |
75 | 9: bf 30,10f | |
76 | sth r4,0(r6) | |
77 | addi r6,r6,2 | |
78 | 10: bflr 31 | |
79 | stb r4,0(r6) | |
80 | blr | |
9445aa1a | 81 | EXPORT_SYMBOL(memset) |
70d64cea | 82 | |
6f5405bc | 83 | _GLOBAL_TOC(memmove) |
70d64cea | 84 | cmplw 0,r3,r4 |
b1576fec AB |
85 | bgt backwards_memcpy |
86 | b memcpy | |
70d64cea PM |
87 | |
88 | _GLOBAL(backwards_memcpy) | |
89 | rlwinm. r7,r5,32-3,3,31 /* r0 = r5 >> 3 */ | |
90 | add r6,r3,r5 | |
91 | add r4,r4,r5 | |
92 | beq 2f | |
93 | andi. r0,r6,3 | |
94 | mtctr r7 | |
95 | bne 5f | |
12ab11a2 | 96 | .balign 16 |
70d64cea PM |
97 | 1: lwz r7,-4(r4) |
98 | lwzu r8,-8(r4) | |
99 | stw r7,-4(r6) | |
100 | stwu r8,-8(r6) | |
101 | bdnz 1b | |
102 | andi. r5,r5,7 | |
103 | 2: cmplwi 0,r5,4 | |
104 | blt 3f | |
105 | lwzu r0,-4(r4) | |
106 | subi r5,r5,4 | |
107 | stwu r0,-4(r6) | |
108 | 3: cmpwi 0,r5,0 | |
109 | beqlr | |
110 | mtctr r5 | |
111 | 4: lbzu r0,-1(r4) | |
112 | stbu r0,-1(r6) | |
113 | bdnz 4b | |
114 | blr | |
115 | 5: mtctr r0 | |
116 | 6: lbzu r7,-1(r4) | |
117 | stbu r7,-1(r6) | |
118 | bdnz 6b | |
119 | subf r5,r0,r5 | |
120 | rlwinm. r7,r5,32-3,3,31 | |
121 | beq 2b | |
122 | mtctr r7 | |
123 | b 1b | |
9445aa1a | 124 | EXPORT_SYMBOL(memmove) |