Michal Simek | 0d6de95 | 2009-05-26 16:30:23 +0200 | [diff] [blame] | 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> |
Michal Simek | ebe2112 | 2011-06-10 10:49:08 +0200 | [diff] [blame^] | 13 | #include <asm/page.h> |
Michal Simek | 0d6de95 | 2009-05-26 16:30:23 +0200 | [diff] [blame] | 14 | |
| 15 | /* |
| 16 | * int __strncpy_user(char *to, char *from, int len); |
| 17 | * |
| 18 | * Returns: |
| 19 | * -EFAULT for an exception |
| 20 | * len if we hit the buffer limit |
| 21 | * bytes copied |
| 22 | */ |
| 23 | |
| 24 | .text |
| 25 | .globl __strncpy_user; |
Michal Simek | 1385196 | 2010-03-23 08:09:32 +0100 | [diff] [blame] | 26 | .type __strncpy_user, @function |
Michal Simek | 0d6de95 | 2009-05-26 16:30:23 +0200 | [diff] [blame] | 27 | .align 4; |
| 28 | __strncpy_user: |
| 29 | |
| 30 | /* |
| 31 | * r5 - to |
| 32 | * r6 - from |
| 33 | * r7 - len |
| 34 | * r3 - temp count |
| 35 | * r4 - temp val |
| 36 | */ |
| 37 | addik r3,r7,0 /* temp_count = len */ |
| 38 | beqi r3,3f |
| 39 | 1: |
| 40 | lbu r4,r6,r0 |
| 41 | sb r4,r5,r0 |
| 42 | |
| 43 | addik r3,r3,-1 |
| 44 | beqi r3,2f /* break on len */ |
| 45 | |
| 46 | addik r5,r5,1 |
| 47 | bneid r4,1b |
| 48 | addik r6,r6,1 /* delay slot */ |
| 49 | addik r3,r3,1 /* undo "temp_count--" */ |
| 50 | 2: |
| 51 | rsubk r3,r3,r7 /* temp_count = len - temp_count */ |
| 52 | 3: |
| 53 | rtsd r15,8 |
| 54 | nop |
Michal Simek | 1385196 | 2010-03-23 08:09:32 +0100 | [diff] [blame] | 55 | .size __strncpy_user, . - __strncpy_user |
Michal Simek | 0d6de95 | 2009-05-26 16:30:23 +0200 | [diff] [blame] | 56 | |
Michal Simek | 0d6de95 | 2009-05-26 16:30:23 +0200 | [diff] [blame] | 57 | .section .fixup, "ax" |
| 58 | .align 2 |
| 59 | 4: |
| 60 | brid 3b |
| 61 | addik r3,r0, -EFAULT |
| 62 | |
| 63 | .section __ex_table, "a" |
| 64 | .word 1b,4b |
| 65 | |
| 66 | /* |
| 67 | * int __strnlen_user(char __user *str, int maxlen); |
| 68 | * |
| 69 | * Returns: |
| 70 | * 0 on error |
| 71 | * maxlen + 1 if no NUL byte found within maxlen bytes |
| 72 | * size of the string (including NUL byte) |
| 73 | */ |
| 74 | |
| 75 | .text |
| 76 | .globl __strnlen_user; |
Michal Simek | 1385196 | 2010-03-23 08:09:32 +0100 | [diff] [blame] | 77 | .type __strnlen_user, @function |
Michal Simek | 0d6de95 | 2009-05-26 16:30:23 +0200 | [diff] [blame] | 78 | .align 4; |
| 79 | __strnlen_user: |
| 80 | addik r3,r6,0 |
| 81 | beqi r3,3f |
| 82 | 1: |
| 83 | lbu r4,r5,r0 |
| 84 | beqid r4,2f /* break on NUL */ |
| 85 | addik r3,r3,-1 /* delay slot */ |
| 86 | |
| 87 | bneid r3,1b |
| 88 | addik r5,r5,1 /* delay slot */ |
| 89 | |
| 90 | addik r3,r3,-1 /* for break on len */ |
| 91 | 2: |
| 92 | rsubk r3,r3,r6 |
| 93 | 3: |
| 94 | rtsd r15,8 |
| 95 | nop |
Michal Simek | 1385196 | 2010-03-23 08:09:32 +0100 | [diff] [blame] | 96 | .size __strnlen_user, . - __strnlen_user |
Michal Simek | 0d6de95 | 2009-05-26 16:30:23 +0200 | [diff] [blame] | 97 | |
Michal Simek | 0d6de95 | 2009-05-26 16:30:23 +0200 | [diff] [blame] | 98 | .section .fixup,"ax" |
| 99 | 4: |
| 100 | brid 3b |
| 101 | addk r3,r0,r0 |
| 102 | |
| 103 | .section __ex_table,"a" |
| 104 | .word 1b,4b |
| 105 | |
Michal Simek | ebe2112 | 2011-06-10 10:49:08 +0200 | [diff] [blame^] | 106 | /* Loop unrolling for __copy_tofrom_user */ |
| 107 | #define COPY(offset) \ |
| 108 | 1: lwi r4 , r6, 0x0000 + offset; \ |
| 109 | 2: lwi r19, r6, 0x0004 + offset; \ |
| 110 | 3: lwi r20, r6, 0x0008 + offset; \ |
| 111 | 4: lwi r21, r6, 0x000C + offset; \ |
| 112 | 5: lwi r22, r6, 0x0010 + offset; \ |
| 113 | 6: lwi r23, r6, 0x0014 + offset; \ |
| 114 | 7: lwi r24, r6, 0x0018 + offset; \ |
| 115 | 8: lwi r25, r6, 0x001C + offset; \ |
| 116 | 9: swi r4 , r5, 0x0000 + offset; \ |
| 117 | 10: swi r19, r5, 0x0004 + offset; \ |
| 118 | 11: swi r20, r5, 0x0008 + offset; \ |
| 119 | 12: swi r21, r5, 0x000C + offset; \ |
| 120 | 13: swi r22, r5, 0x0010 + offset; \ |
| 121 | 14: swi r23, r5, 0x0014 + offset; \ |
| 122 | 15: swi r24, r5, 0x0018 + offset; \ |
| 123 | 16: swi r25, r5, 0x001C + offset; \ |
| 124 | .section __ex_table,"a"; \ |
| 125 | .word 1b, 0f; \ |
| 126 | .word 2b, 0f; \ |
| 127 | .word 3b, 0f; \ |
| 128 | .word 4b, 0f; \ |
| 129 | .word 5b, 0f; \ |
| 130 | .word 6b, 0f; \ |
| 131 | .word 7b, 0f; \ |
| 132 | .word 8b, 0f; \ |
| 133 | .word 9b, 0f; \ |
| 134 | .word 10b, 0f; \ |
| 135 | .word 11b, 0f; \ |
| 136 | .word 12b, 0f; \ |
| 137 | .word 13b, 0f; \ |
| 138 | .word 14b, 0f; \ |
| 139 | .word 15b, 0f; \ |
| 140 | .word 16b, 0f; \ |
| 141 | .text |
| 142 | |
| 143 | #define COPY_80(offset) \ |
| 144 | COPY(0x00 + offset);\ |
| 145 | COPY(0x20 + offset);\ |
| 146 | COPY(0x40 + offset);\ |
| 147 | COPY(0x60 + offset); |
| 148 | |
Michal Simek | 0d6de95 | 2009-05-26 16:30:23 +0200 | [diff] [blame] | 149 | /* |
| 150 | * int __copy_tofrom_user(char *to, char *from, int len) |
| 151 | * Return: |
| 152 | * 0 on success |
| 153 | * number of not copied bytes on error |
| 154 | */ |
| 155 | .text |
| 156 | .globl __copy_tofrom_user; |
Michal Simek | 1385196 | 2010-03-23 08:09:32 +0100 | [diff] [blame] | 157 | .type __copy_tofrom_user, @function |
Michal Simek | 0d6de95 | 2009-05-26 16:30:23 +0200 | [diff] [blame] | 158 | .align 4; |
| 159 | __copy_tofrom_user: |
| 160 | /* |
| 161 | * r5 - to |
| 162 | * r6 - from |
| 163 | * r7, r3 - count |
| 164 | * r4 - tempval |
| 165 | */ |
Michal Simek | 9b133f8 | 2011-06-10 11:03:44 +0200 | [diff] [blame] | 166 | beqid r7, 0f /* zero size is not likely */ |
Michal Simek | ca3865b | 2010-03-22 20:31:26 +0100 | [diff] [blame] | 167 | or r3, r5, r6 /* find if is any to/from unaligned */ |
Michal Simek | 782d491 | 2011-06-10 11:08:57 +0200 | [diff] [blame] | 168 | or r3, r3, r7 /* find if count is unaligned */ |
| 169 | andi r3, r3, 0x3 /* mask last 3 bits */ |
| 170 | bneid r3, bu1 /* if r3 is not zero then byte copying */ |
Michal Simek | ca3865b | 2010-03-22 20:31:26 +0100 | [diff] [blame] | 171 | or r3, r0, r0 |
| 172 | |
Michal Simek | ebe2112 | 2011-06-10 10:49:08 +0200 | [diff] [blame^] | 173 | rsubi r3, r7, PAGE_SIZE /* detect PAGE_SIZE */ |
| 174 | beqid r3, page; |
| 175 | or r3, r0, r0 |
| 176 | |
Michal Simek | c83858b | 2011-06-10 11:07:55 +0200 | [diff] [blame] | 177 | w1: lw r4, r6, r3 /* at least one 4 byte copy */ |
| 178 | w2: sw r4, r5, r3 |
Michal Simek | ca3865b | 2010-03-22 20:31:26 +0100 | [diff] [blame] | 179 | addik r7, r7, -4 |
Michal Simek | c83858b | 2011-06-10 11:07:55 +0200 | [diff] [blame] | 180 | bneid r7, w1 |
Michal Simek | ca3865b | 2010-03-22 20:31:26 +0100 | [diff] [blame] | 181 | addik r3, r3, 4 |
| 182 | addik r3, r7, 0 |
| 183 | rtsd r15, 8 |
| 184 | nop |
Michal Simek | eedac79 | 2011-06-10 11:05:45 +0200 | [diff] [blame] | 185 | |
| 186 | .section __ex_table,"a" |
Michal Simek | c83858b | 2011-06-10 11:07:55 +0200 | [diff] [blame] | 187 | .word w1, 0f; |
| 188 | .word w2, 0f; |
Michal Simek | eedac79 | 2011-06-10 11:05:45 +0200 | [diff] [blame] | 189 | .text |
| 190 | |
Michal Simek | ebe2112 | 2011-06-10 10:49:08 +0200 | [diff] [blame^] | 191 | .align 4 /* Alignment is important to keep icache happy */ |
| 192 | page: /* Create room on stack and save registers for storign values */ |
| 193 | addik r1, r1, -32 |
| 194 | swi r19, r1, 4 |
| 195 | swi r20, r1, 8 |
| 196 | swi r21, r1, 12 |
| 197 | swi r22, r1, 16 |
| 198 | swi r23, r1, 20 |
| 199 | swi r24, r1, 24 |
| 200 | swi r25, r1, 28 |
| 201 | loop: /* r4, r19, r20, r21, r22, r23, r24, r25 are used for storing values */ |
| 202 | /* Loop unrolling to get performance boost */ |
| 203 | COPY_80(0x000); |
| 204 | COPY_80(0x080); |
| 205 | COPY_80(0x100); |
| 206 | COPY_80(0x180); |
| 207 | /* copy loop */ |
| 208 | addik r6, r6, 0x200 |
| 209 | addik r7, r7, -0x200 |
| 210 | bneid r7, loop |
| 211 | addik r5, r5, 0x200 |
| 212 | /* Restore register content */ |
| 213 | lwi r19, r1, 4 |
| 214 | lwi r20, r1, 8 |
| 215 | lwi r21, r1, 12 |
| 216 | lwi r22, r1, 16 |
| 217 | lwi r23, r1, 20 |
| 218 | lwi r24, r1, 24 |
| 219 | lwi r25, r1, 28 |
| 220 | addik r1, r1, 32 |
| 221 | /* return back */ |
| 222 | addik r3, r7, 0 |
| 223 | rtsd r15, 8 |
| 224 | nop |
| 225 | |
| 226 | .align 4 /* Alignment is important to keep icache happy */ |
Michal Simek | c83858b | 2011-06-10 11:07:55 +0200 | [diff] [blame] | 227 | bu1: lbu r4,r6,r3 |
| 228 | bu2: sb r4,r5,r3 |
Michal Simek | ca3865b | 2010-03-22 20:31:26 +0100 | [diff] [blame] | 229 | addik r7,r7,-1 |
Michal Simek | c83858b | 2011-06-10 11:07:55 +0200 | [diff] [blame] | 230 | bneid r7,bu1 |
Michal Simek | ca3865b | 2010-03-22 20:31:26 +0100 | [diff] [blame] | 231 | addik r3,r3,1 /* delay slot */ |
Michal Simek | 9b133f8 | 2011-06-10 11:03:44 +0200 | [diff] [blame] | 232 | 0: |
Michal Simek | ca3865b | 2010-03-22 20:31:26 +0100 | [diff] [blame] | 233 | addik r3,r7,0 |
Michal Simek | 0d6de95 | 2009-05-26 16:30:23 +0200 | [diff] [blame] | 234 | rtsd r15,8 |
| 235 | nop |
Michal Simek | 1385196 | 2010-03-23 08:09:32 +0100 | [diff] [blame] | 236 | .size __copy_tofrom_user, . - __copy_tofrom_user |
Michal Simek | 0d6de95 | 2009-05-26 16:30:23 +0200 | [diff] [blame] | 237 | |
Michal Simek | 0d6de95 | 2009-05-26 16:30:23 +0200 | [diff] [blame] | 238 | .section __ex_table,"a" |
Michal Simek | c83858b | 2011-06-10 11:07:55 +0200 | [diff] [blame] | 239 | .word bu1, 0b; |
| 240 | .word bu2, 0b; |
Michal Simek | eedac79 | 2011-06-10 11:05:45 +0200 | [diff] [blame] | 241 | .text |