Loading...
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 | /* * 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. * * Copyright (C) 2009, Wind River Systems Inc * Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com */ #include <linux/export.h> #include <linux/uaccess.h> asm(".global raw_copy_from_user\n" " .type raw_copy_from_user, @function\n" "raw_copy_from_user:\n" " movi r2,7\n" " mov r3,r4\n" " bge r2,r6,1f\n" " xor r2,r4,r5\n" " andi r2,r2,3\n" " movi r7,3\n" " beq r2,zero,4f\n" "1: addi r6,r6,-1\n" " movi r2,-1\n" " beq r6,r2,3f\n" " mov r7,r2\n" "2: ldbu r2,0(r5)\n" " addi r6,r6,-1\n" " addi r5,r5,1\n" " stb r2,0(r3)\n" " addi r3,r3,1\n" " bne r6,r7,2b\n" "3:\n" " addi r2,r6,1\n" " ret\n" "13:mov r2,r6\n" " ret\n" "4: andi r2,r4,1\n" " cmpeq r2,r2,zero\n" " beq r2,zero,7f\n" "5: andi r2,r3,2\n" " beq r2,zero,6f\n" "9: ldhu r2,0(r5)\n" " addi r6,r6,-2\n" " addi r5,r5,2\n" " sth r2,0(r3)\n" " addi r3,r3,2\n" "6: bge r7,r6,1b\n" "10:ldw r2,0(r5)\n" " addi r6,r6,-4\n" " addi r5,r5,4\n" " stw r2,0(r3)\n" " addi r3,r3,4\n" " br 6b\n" "7: ldbu r2,0(r5)\n" " addi r6,r6,-1\n" " addi r5,r5,1\n" " addi r3,r4,1\n" " stb r2,0(r4)\n" " br 5b\n" ".section __ex_table,\"a\"\n" ".word 2b,3b\n" ".word 9b,13b\n" ".word 10b,13b\n" ".word 7b,13b\n" ".previous\n" ); EXPORT_SYMBOL(raw_copy_from_user); asm( " .global raw_copy_to_user\n" " .type raw_copy_to_user, @function\n" "raw_copy_to_user:\n" " movi r2,7\n" " mov r3,r4\n" " bge r2,r6,1f\n" " xor r2,r4,r5\n" " andi r2,r2,3\n" " movi r7,3\n" " beq r2,zero,4f\n" /* Bail if we try to copy zero bytes */ "1: addi r6,r6,-1\n" " movi r2,-1\n" " beq r6,r2,3f\n" /* Copy byte by byte for small copies and if src^dst != 0 */ " mov r7,r2\n" "2: ldbu r2,0(r5)\n" " addi r5,r5,1\n" "9: stb r2,0(r3)\n" " addi r6,r6,-1\n" " addi r3,r3,1\n" " bne r6,r7,2b\n" "3: addi r2,r6,1\n" " ret\n" "13:mov r2,r6\n" " ret\n" /* If 'to' is an odd address byte copy */ "4: andi r2,r4,1\n" " cmpeq r2,r2,zero\n" " beq r2,zero,7f\n" /* If 'to' is not divideable by four copy halfwords */ "5: andi r2,r3,2\n" " beq r2,zero,6f\n" " ldhu r2,0(r5)\n" " addi r5,r5,2\n" "10:sth r2,0(r3)\n" " addi r6,r6,-2\n" " addi r3,r3,2\n" /* Copy words */ "6: bge r7,r6,1b\n" " ldw r2,0(r5)\n" " addi r5,r5,4\n" "11:stw r2,0(r3)\n" " addi r6,r6,-4\n" " addi r3,r3,4\n" " br 6b\n" /* Copy remaining bytes */ "7: ldbu r2,0(r5)\n" " addi r5,r5,1\n" " addi r3,r4,1\n" "12: stb r2,0(r4)\n" " addi r6,r6,-1\n" " br 5b\n" ".section __ex_table,\"a\"\n" ".word 9b,3b\n" ".word 10b,13b\n" ".word 11b,13b\n" ".word 12b,13b\n" ".previous\n"); EXPORT_SYMBOL(raw_copy_to_user); |