projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 0d6de953 MS |
1 | /* |
| 2 | * Copyright (C) 2009 Michal Simek <monstr@monstr.eu> | |
| 3 | * Copyright (C) 2009 PetaLogix | |
| 4 | * Copyright (C) 2007 LynuxWorks, Inc. | |
| 5 | * | |
| 6 | * This file is subject to the terms and conditions of the GNU General Public | |
| 7 | * License. See the file "COPYING" in the main directory of this archive | |
| 8 | * for more details. | |
| 9 | */ | |
| 10 | ||
| 11 | #include <linux/errno.h> | |
| 12 | #include <linux/linkage.h> | |
| 13 | ||
| 14 | /* | |
| 15 | * int __strncpy_user(char *to, char *from, int len); | |
| 16 | * | |
| 17 | * Returns: | |
| 18 | * -EFAULT for an exception | |
| 19 | * len if we hit the buffer limit | |
| 20 | * bytes copied | |
| 21 | */ | |
| 22 | ||
| 23 | .text | |
| 24 | .globl __strncpy_user; | |
| 13851966 | 25 | .type __strncpy_user, @function |
| 0d6de953 MS |
26 | .align 4; |
| 27 | __strncpy_user: | |
| 28 | ||
| 29 | /* | |
| 30 | * r5 - to | |
| 31 | * r6 - from | |
| 32 | * r7 - len | |
| 33 | * r3 - temp count | |
| 34 | * r4 - temp val | |
| 35 | */ | |
| 36 | addik r3,r7,0 /* temp_count = len */ | |
| 37 | beqi r3,3f | |
| 38 | 1: | |
| 39 | lbu r4,r6,r0 | |
| 40 | sb r4,r5,r0 | |
| 41 | ||
| 42 | addik r3,r3,-1 | |
| 43 | beqi r3,2f /* break on len */ | |
| 44 | ||
| 45 | addik r5,r5,1 | |
| 46 | bneid r4,1b | |
| 47 | addik r6,r6,1 /* delay slot */ | |
| 48 | addik r3,r3,1 /* undo "temp_count--" */ | |
| 49 | 2: | |
| 50 | rsubk r3,r3,r7 /* temp_count = len - temp_count */ | |
| 51 | 3: | |
| 52 | rtsd r15,8 | |
| 53 | nop | |
| 13851966 | 54 | .size __strncpy_user, . - __strncpy_user |
| 0d6de953 | 55 | |
| 0d6de953 MS |
56 | .section .fixup, "ax" |
| 57 | .align 2 | |
| 58 | 4: | |
| 59 | brid 3b | |
| 60 | addik r3,r0, -EFAULT | |
| 61 | ||
| 62 | .section __ex_table, "a" | |
| 63 | .word 1b,4b | |
| 64 | ||
| 65 | /* | |
| 66 | * int __strnlen_user(char __user *str, int maxlen); | |
| 67 | * | |
| 68 | * Returns: | |
| 69 | * 0 on error | |
| 70 | * maxlen + 1 if no NUL byte found within maxlen bytes | |
| 71 | * size of the string (including NUL byte) | |
| 72 | */ | |
| 73 | ||
| 74 | .text | |
| 75 | .globl __strnlen_user; | |
| 13851966 | 76 | .type __strnlen_user, @function |
| 0d6de953 MS |
77 | .align 4; |
| 78 | __strnlen_user: | |
| 79 | addik r3,r6,0 | |
| 80 | beqi r3,3f | |
| 81 | 1: | |
| 82 | lbu r4,r5,r0 | |
| 83 | beqid r4,2f /* break on NUL */ | |
| 84 | addik r3,r3,-1 /* delay slot */ | |
| 85 | ||
| 86 | bneid r3,1b | |
| 87 | addik r5,r5,1 /* delay slot */ | |
| 88 | ||
| 89 | addik r3,r3,-1 /* for break on len */ | |
| 90 | 2: | |
| 91 | rsubk r3,r3,r6 | |
| 92 | 3: | |
| 93 | rtsd r15,8 | |
| 94 | nop | |
| 13851966 | 95 | .size __strnlen_user, . - __strnlen_user |
| 0d6de953 | 96 | |
| 0d6de953 MS |
97 | .section .fixup,"ax" |
| 98 | 4: | |
| 99 | brid 3b | |
| 100 | addk r3,r0,r0 | |
| 101 | ||
| 102 | .section __ex_table,"a" | |
| 103 | .word 1b,4b | |
| 104 | ||
| 105 | /* | |
| 106 | * int __copy_tofrom_user(char *to, char *from, int len) | |
| 107 | * Return: | |
| 108 | * 0 on success | |
| 109 | * number of not copied bytes on error | |
| 110 | */ | |
| 111 | .text | |
| 112 | .globl __copy_tofrom_user; | |
| 13851966 | 113 | .type __copy_tofrom_user, @function |
| 0d6de953 MS |
114 | .align 4; |
| 115 | __copy_tofrom_user: | |
| 116 | /* | |
| 117 | * r5 - to | |
| 118 | * r6 - from | |
| 119 | * r7, r3 - count | |
| 120 | * r4 - tempval | |
| 121 | */ | |
| ca3865ba MS |
122 | beqid r7, 3f /* zero size is not likely */ |
| 123 | andi r3, r7, 0x3 /* filter add count */ | |
| 124 | bneid r3, 4f /* if is odd value then byte copying */ | |
| 125 | or r3, r5, r6 /* find if is any to/from unaligned */ | |
| 126 | andi r3, r3, 0x3 /* mask unaligned */ | |
| 127 | bneid r3, 1f /* it is unaligned -> then jump */ | |
| 128 | or r3, r0, r0 | |
| 129 | ||
| 130 | /* at least one 4 byte copy */ | |
| 131 | 5: lw r4, r6, r3 | |
| 132 | 6: sw r4, r5, r3 | |
| 133 | addik r7, r7, -4 | |
| 134 | bneid r7, 5b | |
| 135 | addik r3, r3, 4 | |
| 136 | addik r3, r7, 0 | |
| 137 | rtsd r15, 8 | |
| 138 | nop | |
| 139 | 4: or r3, r0, r0 | |
| 140 | 1: lbu r4,r6,r3 | |
| 141 | 2: sb r4,r5,r3 | |
| 142 | addik r7,r7,-1 | |
| 143 | bneid r7,1b | |
| 144 | addik r3,r3,1 /* delay slot */ | |
| 0d6de953 | 145 | 3: |
| ca3865ba | 146 | addik r3,r7,0 |
| 0d6de953 MS |
147 | rtsd r15,8 |
| 148 | nop | |
| 13851966 | 149 | .size __copy_tofrom_user, . - __copy_tofrom_user |
| 0d6de953 | 150 | |
| 0d6de953 | 151 | .section __ex_table,"a" |
| ca3865ba | 152 | .word 1b,3b,2b,3b,5b,3b,6b,3b |