projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 14cf11af 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 | */ | |
| 14cf11af PM |
11 | #include <asm/processor.h> |
| 12 | #include <asm/errno.h> | |
| 13 | #include <asm/ppc_asm.h> | |
| 9445aa1a | 14 | #include <asm/export.h> |
| 14cf11af | 15 | |
| 14cf11af PM |
16 | .text |
| 17 | ||
| 14cf11af PM |
18 | /* This clears out any unused part of the destination buffer, |
| 19 | just as the libc version does. -- paulus */ | |
| 20 | _GLOBAL(strncpy) | |
| ca5d0674 | 21 | PPC_LCMPI 0,r5,0 |
| 14cf11af PM |
22 | beqlr |
| 23 | mtctr r5 | |
| 24 | addi r6,r3,-1 | |
| 25 | addi r4,r4,-1 | |
| 87a156fb | 26 | .balign 16 |
| 14cf11af PM |
27 | 1: lbzu r0,1(r4) |
| 28 | cmpwi 0,r0,0 | |
| 29 | stbu r0,1(r6) | |
| 30 | bdnzf 2,1b /* dec ctr, branch if ctr != 0 && !cr0.eq */ | |
| 31 | bnelr /* if we didn't hit a null char, we're done */ | |
| 32 | mfctr r5 | |
| ca5d0674 | 33 | PPC_LCMPI 0,r5,0 /* any space left in destination buffer? */ |
| 14cf11af PM |
34 | beqlr /* we know r0 == 0 here */ |
| 35 | 2: stbu r0,1(r6) /* clear it out if so */ | |
| 36 | bdnz 2b | |
| 37 | blr | |
| 9445aa1a | 38 | EXPORT_SYMBOL(strncpy) |
| 14cf11af | 39 | |
| 0119536c | 40 | _GLOBAL(strncmp) |
| ca5d0674 AS |
41 | PPC_LCMPI 0,r5,0 |
| 42 | beq- 2f | |
| 0119536c SR |
43 | mtctr r5 |
| 44 | addi r5,r3,-1 | |
| 45 | addi r4,r4,-1 | |
| 87a156fb | 46 | .balign 16 |
| 0119536c SR |
47 | 1: lbzu r3,1(r5) |
| 48 | cmpwi 1,r3,0 | |
| 49 | lbzu r0,1(r4) | |
| 50 | subf. r3,r0,r3 | |
| 51 | beqlr 1 | |
| 52 | bdnzt eq,1b | |
| 53 | blr | |
| 637a9902 JM |
54 | 2: li r3,0 |
| 55 | blr | |
| 9445aa1a | 56 | EXPORT_SYMBOL(strncmp) |
| 0119536c | 57 | |
| 15c2d45d | 58 | #ifdef CONFIG_PPC32 |
| 14cf11af | 59 | _GLOBAL(memcmp) |
| ca5d0674 AS |
60 | PPC_LCMPI 0,r5,0 |
| 61 | beq- 2f | |
| 14cf11af PM |
62 | mtctr r5 |
| 63 | addi r6,r3,-1 | |
| 64 | addi r4,r4,-1 | |
| 65 | 1: lbzu r3,1(r6) | |
| 66 | lbzu r0,1(r4) | |
| 67 | subf. r3,r0,r3 | |
| 68 | bdnzt 2,1b | |
| 69 | blr | |
| 70 | 2: li r3,0 | |
| 71 | blr | |
| 9445aa1a | 72 | EXPORT_SYMBOL(memcmp) |
| 15c2d45d | 73 | #endif |
| 14cf11af PM |
74 | |
| 75 | _GLOBAL(memchr) | |
| ca5d0674 AS |
76 | PPC_LCMPI 0,r5,0 |
| 77 | beq- 2f | |
| 14cf11af PM |
78 | mtctr r5 |
| 79 | addi r3,r3,-1 | |
| 87a156fb | 80 | .balign 16 |
| 14cf11af PM |
81 | 1: lbzu r0,1(r3) |
| 82 | cmpw 0,r0,r4 | |
| 83 | bdnzf 2,1b | |
| 84 | beqlr | |
| 85 | 2: li r3,0 | |
| 86 | blr | |
| 9445aa1a | 87 | EXPORT_SYMBOL(memchr) |
| 14cf11af | 88 | |
| 17968fbb | 89 | #ifdef CONFIG_PPC32 |
| 14cf11af PM |
90 | _GLOBAL(__clear_user) |
| 91 | addi r6,r3,-4 | |
| 92 | li r3,0 | |
| 93 | li r5,0 | |
| 94 | cmplwi 0,r4,4 | |
| 95 | blt 7f | |
| 96 | /* clear a single word */ | |
| 97 | 11: stwu r5,4(r6) | |
| 98 | beqlr | |
| 99 | /* clear word sized chunks */ | |
| 100 | andi. r0,r6,3 | |
| 101 | add r4,r0,r4 | |
| 102 | subf r6,r0,r6 | |
| 103 | srwi r0,r4,2 | |
| 104 | andi. r4,r4,3 | |
| 105 | mtctr r0 | |
| 106 | bdz 7f | |
| 107 | 1: stwu r5,4(r6) | |
| 108 | bdnz 1b | |
| 109 | /* clear byte sized chunks */ | |
| 110 | 7: cmpwi 0,r4,0 | |
| 111 | beqlr | |
| 112 | mtctr r4 | |
| 113 | addi r6,r6,3 | |
| 114 | 8: stbu r5,1(r6) | |
| 115 | bdnz 8b | |
| 116 | blr | |
| 117 | 90: mr r3,r4 | |
| 118 | blr | |
| 119 | 91: mfctr r3 | |
| 120 | slwi r3,r3,2 | |
| 121 | add r3,r3,r4 | |
| 122 | blr | |
| 123 | 92: mfctr r3 | |
| 124 | blr | |
| 125 | ||
| 24bfa6a9 NP |
126 | EX_TABLE(11b, 90b) |
| 127 | EX_TABLE(1b, 91b) | |
| 128 | EX_TABLE(8b, 92b) | |
| 129 | ||
| 9445aa1a | 130 | EXPORT_SYMBOL(__clear_user) |
| 17968fbb | 131 | #endif |