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: move.l %0,%3\n" 34 "7: clr.l (%2)+\n" 35 " subq.l #1,%3\n" 36 " jne 7b\n" 37 " lsl.l #2,%0\n" 38 " btst #1,%5\n" 39 " jeq 8f\n" 40 "30: clr.w (%2)+\n" 41 " addq.l #2,%0\n" 42 "8: btst #0,%5\n" 43 " jeq 6b\n" 44 "50: clr.b (%2)+\n" 45 " addq.l #1,%0\n" 46 " jra 6b\n" 47 " .previous\n" 48 "\n" 49 " .section __ex_table,\"a\"\n" 50 " .align 4\n" 51 " .long 1b,10b\n" 52 " .long 3b,30b\n" 53 " .long 5b,50b\n" 54 " .previous" 55 : "=d" (res), "+a" (from), "+a" (to), "=&d" (tmp) 56 : "0" (n / 4), "d" (n & 3)); 57 58 return res; 59 } 60 EXPORT_SYMBOL(__generic_copy_from_user); 61 62 unsigned long __generic_copy_to_user(void __user *to, const void *from, 63 unsigned long n) 64 { 65 unsigned long tmp, res; 66 67 asm volatile ("\n" 68 " tst.l %0\n" 69 " jeq 4f\n" 70 "1: move.l (%1)+,%3\n" 71 "2: "MOVES".l %3,(%2)+\n" 72 "3: subq.l #1,%0\n" 73 " jne 1b\n" 74 "4: btst #1,%5\n" 75 " jeq 6f\n" 76 " move.w (%1)+,%3\n" 77 "5: "MOVES".w %3,(%2)+\n" 78 "6: btst #0,%5\n" 79 " jeq 8f\n" 80 " move.b (%1)+,%3\n" 81 "7: "MOVES".b %3,(%2)+\n" 82 "8:\n" 83 " .section .fixup,\"ax\"\n" 84 " .even\n" 85 "20: lsl.l #2,%0\n" 86 "50: add.l %5,%0\n" 87 " jra 8b\n" 88 " .previous\n" 89 "\n" 90 " .section __ex_table,\"a\"\n" 91 " .align 4\n" 92 " .long 2b,20b\n" 93 " .long 3b,20b\n" 94 " .long 5b,50b\n" 95 " .long 6b,50b\n" 96 " .long 7b,50b\n" 97 " .long 8b,50b\n" 98 " .previous" 99 : "=d" (res), "+a" (from), "+a" (to), "=&d" (tmp) 100 : "0" (n / 4), "d" (n & 3)); 101 102 return res; 103 } 104 EXPORT_SYMBOL(__generic_copy_to_user); 105 106 /* 107 * Zero Userspace 108 */ 109 110 unsigned long __clear_user(void __user *to, unsigned long n) 111 { 112 unsigned long res; 113 114 asm volatile ("\n" 115 " tst.l %0\n" 116 " jeq 3f\n" 117 "1: "MOVES".l %2,(%1)+\n" 118 "2: subq.l #1,%0\n" 119 " jne 1b\n" 120 "3: btst #1,%4\n" 121 " jeq 5f\n" 122 "4: "MOVES".w %2,(%1)+\n" 123 "5: btst #0,%4\n" 124 " jeq 7f\n" 125 "6: "MOVES".b %2,(%1)\n" 126 "7:\n" 127 " .section .fixup,\"ax\"\n" 128 " .even\n" 129 "10: lsl.l #2,%0\n" 130 "40: add.l %4,%0\n" 131 " jra 7b\n" 132 " .previous\n" 133 "\n" 134 " .section __ex_table,\"a\"\n" 135 " .align 4\n" 136 " .long 1b,10b\n" 137 " .long 2b,10b\n" 138 " .long 4b,40b\n" 139 " .long 5b,40b\n" 140 " .long 6b,40b\n" 141 " .long 7b,40b\n" 142 " .previous" 143 : "=d" (res), "+a" (to) 144 : "d" (0), "0" (n / 4), "d" (n & 3)); 145 146 return res; 147 } 148 EXPORT_SYMBOL(__clear_user); 149