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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> | |
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 | |
3467bfd3 | 22 | PPC_MTOCRF 1,r0 |
70d64cea PM |
23 | 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 | |
30 | 1: bf 30,2f | |
31 | sth r4,0(r6) | |
32 | addi r6,r6,2 | |
33 | 2: bf 29,3f | |
34 | stw r4,0(r6) | |
35 | addi r6,r6,4 | |
36 | 3: srdi. r0,r5,6 | |
37 | clrldi r5,r5,58 | |
38 | mtctr r0 | |
39 | beq 5f | |
40 | 4: 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 | |
50 | 5: srwi. r0,r5,3 | |
51 | clrlwi r5,r5,29 | |
3467bfd3 | 52 | PPC_MTOCRF 1,r0 |
70d64cea PM |
53 | 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 | |
60 | 6: bf 30,7f | |
61 | std r4,0(r6) | |
62 | std r4,8(r6) | |
63 | addi r6,r6,16 | |
64 | 7: bf 31,8f | |
65 | std r4,0(r6) | |
66 | addi r6,r6,8 | |
67 | 8: cmpwi r5,0 | |
3467bfd3 | 68 | PPC_MTOCRF 1,r5 |
70d64cea PM |
69 | beqlr+ |
70 | bf 29,9f | |
71 | stw r4,0(r6) | |
72 | addi r6,r6,4 | |
73 | 9: bf 30,10f | |
74 | sth r4,0(r6) | |
75 | addi r6,r6,2 | |
76 | 10: 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 | |
93 | 1: 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 | |
99 | 2: cmplwi 0,r5,4 | |
100 | blt 3f | |
101 | lwzu r0,-4(r4) | |
102 | subi r5,r5,4 | |
103 | stwu r0,-4(r6) | |
104 | 3: cmpwi 0,r5,0 | |
105 | beqlr | |
106 | mtctr r5 | |
107 | 4: lbzu r0,-1(r4) | |
108 | stbu r0,-1(r6) | |
109 | bdnz 4b | |
110 | blr | |
111 | 5: mtctr r0 | |
112 | 6: 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 |