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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 | /* * This file is subject to the terms and conditions of the GNU General Public * License. See the file COPYING in the main directory of this archive * for more details. */ #include <linux/module.h> #include <asm/uaccess.h> unsigned long __generic_copy_from_user(void *to, const void __user *from, unsigned long n) { unsigned long tmp, res; asm volatile ("\n" " tst.l %0\n" " jeq 2f\n" "1: moves.l (%1)+,%3\n" " move.l %3,(%2)+\n" " subq.l #1,%0\n" " jne 1b\n" "2: btst #1,%5\n" " jeq 4f\n" "3: moves.w (%1)+,%3\n" " move.w %3,(%2)+\n" "4: btst #0,%5\n" " jeq 6f\n" "5: moves.b (%1)+,%3\n" " move.b %3,(%2)+\n" "6:\n" " .section .fixup,\"ax\"\n" " .even\n" "10: move.l %0,%3\n" "7: clr.l (%2)+\n" " subq.l #1,%3\n" " jne 7b\n" " lsl.l #2,%0\n" " btst #1,%5\n" " jeq 8f\n" "30: clr.w (%2)+\n" " addq.l #2,%0\n" "8: btst #0,%5\n" " jeq 6b\n" "50: clr.b (%2)+\n" " addq.l #1,%0\n" " jra 6b\n" " .previous\n" "\n" " .section __ex_table,\"a\"\n" " .align 4\n" " .long 1b,10b\n" " .long 3b,30b\n" " .long 5b,50b\n" " .previous" : "=d" (res), "+a" (from), "+a" (to), "=&r" (tmp) : "0" (n / 4), "d" (n & 3)); return res; } EXPORT_SYMBOL(__generic_copy_from_user); unsigned long __generic_copy_to_user(void __user *to, const void *from, unsigned long n) { unsigned long tmp, res; asm volatile ("\n" " tst.l %0\n" " jeq 4f\n" "1: move.l (%1)+,%3\n" "2: moves.l %3,(%2)+\n" "3: subq.l #1,%0\n" " jne 1b\n" "4: btst #1,%5\n" " jeq 6f\n" " move.w (%1)+,%3\n" "5: moves.w %3,(%2)+\n" "6: btst #0,%5\n" " jeq 8f\n" " move.b (%1)+,%3\n" "7: moves.b %3,(%2)+\n" "8:\n" " .section .fixup,\"ax\"\n" " .even\n" "20: lsl.l #2,%0\n" "50: add.l %5,%0\n" " jra 8b\n" " .previous\n" "\n" " .section __ex_table,\"a\"\n" " .align 4\n" " .long 2b,20b\n" " .long 3b,20b\n" " .long 5b,50b\n" " .long 6b,50b\n" " .long 7b,50b\n" " .long 8b,50b\n" " .previous" : "=d" (res), "+a" (from), "+a" (to), "=&r" (tmp) : "0" (n / 4), "d" (n & 3)); return res; } EXPORT_SYMBOL(__generic_copy_to_user); /* * Copy a null terminated string from userspace. */ long strncpy_from_user(char *dst, const char __user *src, long count) { long res; char c; if (count <= 0) return count; asm volatile ("\n" "1: moves.b (%2)+,%4\n" " move.b %4,(%1)+\n" " jeq 2f\n" " subq.l #1,%3\n" " jne 1b\n" "2: sub.l %3,%0\n" "3:\n" " .section .fixup,\"ax\"\n" " .even\n" "10: move.l %5,%0\n" " jra 3b\n" " .previous\n" "\n" " .section __ex_table,\"a\"\n" " .align 4\n" " .long 1b,10b\n" " .previous" : "=d" (res), "+a" (dst), "+a" (src), "+r" (count), "=&d" (c) : "i" (-EFAULT), "0" (count)); return res; } EXPORT_SYMBOL(strncpy_from_user); /* * Return the size of a string (including the ending 0) * * Return 0 on exception, a value greater than N if too long */ long strnlen_user(const char __user *src, long n) { char c; long res; asm volatile ("\n" "1: subq.l #1,%1\n" " jmi 3f\n" "2: moves.b (%0)+,%2\n" " tst.b %2\n" " jne 1b\n" " jra 4f\n" "\n" "3: addq.l #1,%0\n" "4: sub.l %4,%0\n" "5:\n" " .section .fixup,\"ax\"\n" " .even\n" "20: sub.l %0,%0\n" " jra 5b\n" " .previous\n" "\n" " .section __ex_table,\"a\"\n" " .align 4\n" " .long 2b,20b\n" " .previous\n" : "=&a" (res), "+d" (n), "=&d" (c) : "0" (src), "r" (src)); return res; } EXPORT_SYMBOL(strnlen_user); /* * Zero Userspace */ unsigned long __clear_user(void __user *to, unsigned long n) { unsigned long res; asm volatile ("\n" " tst.l %0\n" " jeq 3f\n" "1: moves.l %2,(%1)+\n" "2: subq.l #1,%0\n" " jne 1b\n" "3: btst #1,%4\n" " jeq 5f\n" "4: moves.w %2,(%1)+\n" "5: btst #0,%4\n" " jeq 7f\n" "6: moves.b %2,(%1)\n" "7:\n" " .section .fixup,\"ax\"\n" " .even\n" "10: lsl.l #2,%0\n" "40: add.l %4,%0\n" " jra 7b\n" " .previous\n" "\n" " .section __ex_table,\"a\"\n" " .align 4\n" " .long 1b,10b\n" " .long 2b,10b\n" " .long 4b,40b\n" " .long 5b,40b\n" " .long 6b,40b\n" " .long 7b,40b\n" " .previous" : "=d" (res), "+a" (to) : "r" (0), "0" (n / 4), "d" (n & 3)); return res; } EXPORT_SYMBOL(__clear_user); |