1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file COPYING in the main directory of this archive 4 * for more details. 5 */ 6 7 #include <linux/module.h> 8 #include <linux/uaccess.h> 9 10 unsigned long __generic_copy_from_user(void *to, const void __user *from, 11 unsigned long n) 12 { 13 unsigned long tmp, res; 14 15 asm volatile ("\n" 16 " tst.l %0\n" 17 " jeq 2f\n" 18 "1: "MOVES".l (%1)+,%3\n" 19 " move.l %3,(%2)+\n" 20 " subq.l #1,%0\n" 21 " jne 1b\n" 22 "2: btst #1,%5\n" 23 " jeq 4f\n" 24 "3: "MOVES".w (%1)+,%3\n" 25 " move.w %3,(%2)+\n" 26 "4: btst #0,%5\n" 27 " jeq 6f\n" 28 "5: "MOVES".b (%1)+,%3\n" 29 " move.b %3,(%2)+\n" 30 "6:\n" 31 " .section .fixup,\"ax\"\n" 32 " .even\n" 33 "10: lsl.l #2,%0\n" 34 " btst #1,%5\n" 35 " jeq 8f\n" 36 "30: addq.l #2,%0\n" 37 "8: btst #0,%5\n" 38 " jeq 6b\n" 39 "50: addq.l #1,%0\n" 40 " jra 6b\n" 41 " .previous\n" 42 "\n" 43 " .section __ex_table,\"a\"\n" 44 " .align 4\n" 45 " .long 1b,10b\n" 46 " .long 3b,30b\n" 47 " .long 5b,50b\n" 48 " .previous" 49 : "=d" (res), "+a" (from), "+a" (to), "=&d" (tmp) 50 : "0" (n / 4), "d" (n & 3)); 51 52 return res; 53 } 54 EXPORT_SYMBOL(__generic_copy_from_user); 55 56 unsigned long __generic_copy_to_user(void __user *to, const void *from, 57 unsigned long n) 58 { 59 unsigned long tmp, res; 60 61 asm volatile ("\n" 62 " tst.l %0\n" 63 " jeq 4f\n" 64 "1: move.l (%1)+,%3\n" 65 "2: "MOVES".l %3,(%2)+\n" 66 "3: subq.l #1,%0\n" 67 " jne 1b\n" 68 "4: btst #1,%5\n" 69 " jeq 6f\n" 70 " move.w (%1)+,%3\n" 71 "5: "MOVES".w %3,(%2)+\n" 72 "6: btst #0,%5\n" 73 " jeq 8f\n" 74 " move.b (%1)+,%3\n" 75 "7: "MOVES".b %3,(%2)+\n" 76 "8:\n" 77 " .section .fixup,\"ax\"\n" 78 " .even\n" 79 "20: lsl.l #2,%0\n" 80 "50: add.l %5,%0\n" 81 " jra 8b\n" 82 " .previous\n" 83 "\n" 84 " .section __ex_table,\"a\"\n" 85 " .align 4\n" 86 " .long 2b,20b\n" 87 " .long 3b,20b\n" 88 " .long 5b,50b\n" 89 " .long 6b,50b\n" 90 " .long 7b,50b\n" 91 " .long 8b,50b\n" 92 " .previous" 93 : "=d" (res), "+a" (from), "+a" (to), "=&d" (tmp) 94 : "0" (n / 4), "d" (n & 3)); 95 96 return res; 97 } 98 EXPORT_SYMBOL(__generic_copy_to_user); 99 100 /* 101 * Zero Userspace 102 */ 103 104 unsigned long __clear_user(void __user *to, unsigned long n) 105 { 106 unsigned long res; 107 108 asm volatile ("\n" 109 " tst.l %0\n" 110 " jeq 3f\n" 111 "1: "MOVES".l %2,(%1)+\n" 112 "2: subq.l #1,%0\n" 113 " jne 1b\n" 114 "3: btst #1,%4\n" 115 " jeq 5f\n" 116 "4: "MOVES".w %2,(%1)+\n" 117 "5: btst #0,%4\n" 118 " jeq 7f\n" 119 "6: "MOVES".b %2,(%1)\n" 120 "7:\n" 121 " .section .fixup,\"ax\"\n" 122 " .even\n" 123 "10: lsl.l #2,%0\n" 124 "40: add.l %4,%0\n" 125 " jra 7b\n" 126 " .previous\n" 127 "\n" 128 " .section __ex_table,\"a\"\n" 129 " .align 4\n" 130 " .long 1b,10b\n" 131 " .long 2b,10b\n" 132 " .long 4b,40b\n" 133 " .long 5b,40b\n" 134 " .long 6b,40b\n" 135 " .long 7b,40b\n" 136 " .previous" 137 : "=d" (res), "+a" (to) 138 : "d" (0), "0" (n / 4), "d" (n & 3)); 139 140 return res; 141 } 142 EXPORT_SYMBOL(__clear_user); 143