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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 | // SPDX-License-Identifier: GPL-2.0 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. #include <linux/uaccess.h> #include <linux/types.h> unsigned long raw_copy_from_user(void *to, const void *from, unsigned long n) { int tmp, nsave; __asm__ __volatile__( "0: cmpnei %1, 0 \n" " bf 7f \n" " mov %3, %1 \n" " or %3, %2 \n" " andi %3, 3 \n" " cmpnei %3, 0 \n" " bf 1f \n" " br 5f \n" "1: cmplti %0, 16 \n" " bt 3f \n" "2: ldw %3, (%2, 0) \n" "10: ldw %4, (%2, 4) \n" " stw %3, (%1, 0) \n" " stw %4, (%1, 4) \n" "11: ldw %3, (%2, 8) \n" "12: ldw %4, (%2, 12) \n" " stw %3, (%1, 8) \n" " stw %4, (%1, 12) \n" " addi %2, 16 \n" " addi %1, 16 \n" " subi %0, 16 \n" " br 1b \n" "3: cmplti %0, 4 \n" " bt 5f \n" "4: ldw %3, (%2, 0) \n" " stw %3, (%1, 0) \n" " addi %2, 4 \n" " addi %1, 4 \n" " subi %0, 4 \n" " br 3b \n" "5: cmpnei %0, 0 \n" " bf 7f \n" "6: ldb %3, (%2, 0) \n" " stb %3, (%1, 0) \n" " addi %2, 1 \n" " addi %1, 1 \n" " subi %0, 1 \n" " br 5b \n" "8: stw %3, (%1, 0) \n" " subi %0, 4 \n" " bf 7f \n" "9: subi %0, 8 \n" " bf 7f \n" "13: stw %3, (%1, 8) \n" " subi %0, 12 \n" " bf 7f \n" ".section __ex_table, \"a\" \n" ".align 2 \n" ".long 2b, 7f \n" ".long 4b, 7f \n" ".long 6b, 7f \n" ".long 10b, 8b \n" ".long 11b, 9b \n" ".long 12b,13b \n" ".previous \n" "7: \n" : "=r"(n), "=r"(to), "=r"(from), "=r"(nsave), "=r"(tmp) : "0"(n), "1"(to), "2"(from) : "memory"); return n; } EXPORT_SYMBOL(raw_copy_from_user); unsigned long raw_copy_to_user(void *to, const void *from, unsigned long n) { int w0, w1, w2, w3; __asm__ __volatile__( "0: cmpnei %1, 0 \n" " bf 8f \n" " mov %3, %1 \n" " or %3, %2 \n" " andi %3, 3 \n" " cmpnei %3, 0 \n" " bf 1f \n" " br 5f \n" "1: cmplti %0, 16 \n" /* 4W */ " bt 3f \n" " ldw %3, (%2, 0) \n" " ldw %4, (%2, 4) \n" " ldw %5, (%2, 8) \n" " ldw %6, (%2, 12) \n" "2: stw %3, (%1, 0) \n" "9: stw %4, (%1, 4) \n" "10: stw %5, (%1, 8) \n" "11: stw %6, (%1, 12) \n" " addi %2, 16 \n" " addi %1, 16 \n" " subi %0, 16 \n" " br 1b \n" "3: cmplti %0, 4 \n" /* 1W */ " bt 5f \n" " ldw %3, (%2, 0) \n" "4: stw %3, (%1, 0) \n" " addi %2, 4 \n" " addi %1, 4 \n" " subi %0, 4 \n" " br 3b \n" "5: cmpnei %0, 0 \n" /* 1B */ " bf 13f \n" " ldb %3, (%2, 0) \n" "6: stb %3, (%1, 0) \n" " addi %2, 1 \n" " addi %1, 1 \n" " subi %0, 1 \n" " br 5b \n" "7: subi %0, 4 \n" "8: subi %0, 4 \n" "12: subi %0, 4 \n" " br 13f \n" ".section __ex_table, \"a\" \n" ".align 2 \n" ".long 2b, 13f \n" ".long 4b, 13f \n" ".long 6b, 13f \n" ".long 9b, 12b \n" ".long 10b, 8b \n" ".long 11b, 7b \n" ".previous \n" "13: \n" : "=r"(n), "=r"(to), "=r"(from), "=r"(w0), "=r"(w1), "=r"(w2), "=r"(w3) : "0"(n), "1"(to), "2"(from) : "memory"); return n; } EXPORT_SYMBOL(raw_copy_to_user); /* * __clear_user: - Zero a block of memory in user space, with less checking. * @to: Destination address, in user space. * @n: Number of bytes to zero. * * Zero a block of memory in user space. Caller must check * the specified block with access_ok() before calling this function. * * Returns number of bytes that could not be cleared. * On success, this will be zero. */ unsigned long __clear_user(void __user *to, unsigned long n) { int data, value, tmp; __asm__ __volatile__( "0: cmpnei %1, 0 \n" " bf 7f \n" " mov %3, %1 \n" " andi %3, 3 \n" " cmpnei %3, 0 \n" " bf 1f \n" " br 5f \n" "1: cmplti %0, 32 \n" /* 4W */ " bt 3f \n" "8: stw %2, (%1, 0) \n" "10: stw %2, (%1, 4) \n" "11: stw %2, (%1, 8) \n" "12: stw %2, (%1, 12) \n" "13: stw %2, (%1, 16) \n" "14: stw %2, (%1, 20) \n" "15: stw %2, (%1, 24) \n" "16: stw %2, (%1, 28) \n" " addi %1, 32 \n" " subi %0, 32 \n" " br 1b \n" "3: cmplti %0, 4 \n" /* 1W */ " bt 5f \n" "4: stw %2, (%1, 0) \n" " addi %1, 4 \n" " subi %0, 4 \n" " br 3b \n" "5: cmpnei %0, 0 \n" /* 1B */ "9: bf 7f \n" "6: stb %2, (%1, 0) \n" " addi %1, 1 \n" " subi %0, 1 \n" " br 5b \n" ".section __ex_table,\"a\" \n" ".align 2 \n" ".long 8b, 9b \n" ".long 10b, 9b \n" ".long 11b, 9b \n" ".long 12b, 9b \n" ".long 13b, 9b \n" ".long 14b, 9b \n" ".long 15b, 9b \n" ".long 16b, 9b \n" ".long 4b, 9b \n" ".long 6b, 9b \n" ".previous \n" "7: \n" : "=r"(n), "=r" (data), "=r"(value), "=r"(tmp) : "0"(n), "1"(to), "2"(0) : "memory"); return n; } EXPORT_SYMBOL(__clear_user); |