| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. |
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| 3 | |
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| 4 | #include <linux/uaccess.h> |
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| 5 | #include <linux/types.h> |
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| 6 | |
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| 7 | unsigned long raw_copy_from_user(void *to, const void *from, |
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| 8 | unsigned long n) |
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| 9 | { |
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| 10 | int tmp, nsave; |
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| 11 | |
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| 12 | __asm__ __volatile__( |
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| 13 | "0: cmpnei %1, 0 \n" |
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| 14 | " bf 7f \n" |
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| 15 | " mov %3, %1 \n" |
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| 16 | " or %3, %2 \n" |
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| 17 | " andi %3, 3 \n" |
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| 18 | " cmpnei %3, 0 \n" |
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| 19 | " bf 1f \n" |
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| 20 | " br 5f \n" |
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| 21 | "1: cmplti %0, 16 \n" |
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| 22 | " bt 3f \n" |
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| 23 | "2: ldw %3, (%2, 0) \n" |
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| 24 | "10: ldw %4, (%2, 4) \n" |
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| 25 | " stw %3, (%1, 0) \n" |
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| 26 | " stw %4, (%1, 4) \n" |
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| 27 | "11: ldw %3, (%2, 8) \n" |
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| 28 | "12: ldw %4, (%2, 12) \n" |
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| 29 | " stw %3, (%1, 8) \n" |
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| 30 | " stw %4, (%1, 12) \n" |
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| 31 | " addi %2, 16 \n" |
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| 32 | " addi %1, 16 \n" |
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| 33 | " subi %0, 16 \n" |
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| 34 | " br 1b \n" |
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| 35 | "3: cmplti %0, 4 \n" |
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| 36 | " bt 5f \n" |
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| 37 | "4: ldw %3, (%2, 0) \n" |
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| 38 | " stw %3, (%1, 0) \n" |
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| 39 | " addi %2, 4 \n" |
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| 40 | " addi %1, 4 \n" |
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| 41 | " subi %0, 4 \n" |
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| 42 | " br 3b \n" |
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| 43 | "5: cmpnei %0, 0 \n" |
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| 44 | " bf 7f \n" |
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| 45 | "6: ldb %3, (%2, 0) \n" |
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| 46 | " stb %3, (%1, 0) \n" |
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| 47 | " addi %2, 1 \n" |
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| 48 | " addi %1, 1 \n" |
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| 49 | " subi %0, 1 \n" |
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| 50 | " br 5b \n" |
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| 51 | "8: stw %3, (%1, 0) \n" |
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| 52 | " subi %0, 4 \n" |
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| 53 | " bf 7f \n" |
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| 54 | "9: subi %0, 8 \n" |
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| 55 | " bf 7f \n" |
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| 56 | "13: stw %3, (%1, 8) \n" |
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| 57 | " subi %0, 12 \n" |
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| 58 | " bf 7f \n" |
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| 59 | ".section __ex_table, \"a\" \n" |
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| 60 | ".align 2 \n" |
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| 61 | ".long 2b, 7f \n" |
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| 62 | ".long 4b, 7f \n" |
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| 63 | ".long 6b, 7f \n" |
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| 64 | ".long 10b, 8b \n" |
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| 65 | ".long 11b, 9b \n" |
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| 66 | ".long 12b,13b \n" |
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| 67 | ".previous \n" |
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| 68 | "7: \n" |
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| 69 | : "=r" (n), "=r" (to), "=r" (from), "=r" (nsave), |
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| 70 | "=r" (tmp) |
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| 71 | : "0" (n), "1" (to), "2" (from) |
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| 72 | : "memory" ); |
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| 73 | |
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| 74 | return n; |
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| 75 | } |
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| 76 | EXPORT_SYMBOL(raw_copy_from_user); |
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| 77 | |
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| 78 | unsigned long raw_copy_to_user(void *to, const void *from, |
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| 79 | unsigned long n) |
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| 80 | { |
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| 81 | int w0, w1, w2, w3; |
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| 82 | |
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| 83 | __asm__ __volatile__( |
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| 84 | "0: cmpnei %1, 0 \n" |
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| 85 | " bf 8f \n" |
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| 86 | " mov %3, %1 \n" |
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| 87 | " or %3, %2 \n" |
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| 88 | " andi %3, 3 \n" |
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| 89 | " cmpnei %3, 0 \n" |
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| 90 | " bf 1f \n" |
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| 91 | " br 5f \n" |
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| 92 | "1: cmplti %0, 16 \n" /* 4W */ |
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| 93 | " bt 3f \n" |
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| 94 | " ldw %3, (%2, 0) \n" |
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| 95 | " ldw %4, (%2, 4) \n" |
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| 96 | " ldw %5, (%2, 8) \n" |
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| 97 | " ldw %6, (%2, 12) \n" |
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| 98 | "2: stw %3, (%1, 0) \n" |
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| 99 | "9: stw %4, (%1, 4) \n" |
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| 100 | "10: stw %5, (%1, 8) \n" |
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| 101 | "11: stw %6, (%1, 12) \n" |
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| 102 | " addi %2, 16 \n" |
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| 103 | " addi %1, 16 \n" |
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| 104 | " subi %0, 16 \n" |
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| 105 | " br 1b \n" |
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| 106 | "3: cmplti %0, 4 \n" /* 1W */ |
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| 107 | " bt 5f \n" |
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| 108 | " ldw %3, (%2, 0) \n" |
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| 109 | "4: stw %3, (%1, 0) \n" |
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| 110 | " addi %2, 4 \n" |
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| 111 | " addi %1, 4 \n" |
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| 112 | " subi %0, 4 \n" |
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| 113 | " br 3b \n" |
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| 114 | "5: cmpnei %0, 0 \n" /* 1B */ |
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| 115 | " bf 13f \n" |
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| 116 | " ldb %3, (%2, 0) \n" |
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| 117 | "6: stb %3, (%1, 0) \n" |
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| 118 | " addi %2, 1 \n" |
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| 119 | " addi %1, 1 \n" |
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| 120 | " subi %0, 1 \n" |
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| 121 | " br 5b \n" |
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| 122 | "7: subi %0, 4 \n" |
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| 123 | "8: subi %0, 4 \n" |
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| 124 | "12: subi %0, 4 \n" |
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| 125 | " br 13f \n" |
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| 126 | ".section __ex_table, \"a\" \n" |
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| 127 | ".align 2 \n" |
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| 128 | ".long 2b, 13f \n" |
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| 129 | ".long 4b, 13f \n" |
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| 130 | ".long 6b, 13f \n" |
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| 131 | ".long 9b, 12b \n" |
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| 132 | ".long 10b, 8b \n" |
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| 133 | ".long 11b, 7b \n" |
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| 134 | ".previous \n" |
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| 135 | "13: \n" |
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| 136 | : "=r" (n), "=r" (to), "=r" (from), "=r" (w0), |
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| 137 | "=r" (w1), "=r" (w2), "=r" (w3) |
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| 138 | : "0" (n), "1" (to), "2" (from) |
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| 139 | : "memory" ); |
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| 140 | |
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| 141 | return n; |
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| 142 | } |
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| 143 | EXPORT_SYMBOL(raw_copy_to_user); |
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| 144 | |
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| 145 | /* |
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| 146 | * __clear_user: - Zero a block of memory in user space, with less checking. |
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| 147 | * @to: Destination address, in user space. |
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| 148 | * @n: Number of bytes to zero. |
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| 149 | * |
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| 150 | * Zero a block of memory in user space. Caller must check |
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| 151 | * the specified block with access_ok() before calling this function. |
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| 152 | * |
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| 153 | * Returns number of bytes that could not be cleared. |
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| 154 | * On success, this will be zero. |
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| 155 | */ |
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| 156 | unsigned long |
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| 157 | __clear_user(void __user *to, unsigned long n) |
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| 158 | { |
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| 159 | int data, value, tmp; |
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| 160 | |
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| 161 | __asm__ __volatile__( |
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| 162 | "0: cmpnei %1, 0 \n" |
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| 163 | " bf 7f \n" |
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| 164 | " mov %3, %1 \n" |
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| 165 | " andi %3, 3 \n" |
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| 166 | " cmpnei %3, 0 \n" |
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| 167 | " bf 1f \n" |
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| 168 | " br 5f \n" |
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| 169 | "1: cmplti %0, 32 \n" /* 4W */ |
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| 170 | " bt 3f \n" |
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| 171 | "8: stw %2, (%1, 0) \n" |
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| 172 | "10: stw %2, (%1, 4) \n" |
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| 173 | "11: stw %2, (%1, 8) \n" |
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| 174 | "12: stw %2, (%1, 12) \n" |
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| 175 | "13: stw %2, (%1, 16) \n" |
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| 176 | "14: stw %2, (%1, 20) \n" |
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| 177 | "15: stw %2, (%1, 24) \n" |
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| 178 | "16: stw %2, (%1, 28) \n" |
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| 179 | " addi %1, 32 \n" |
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| 180 | " subi %0, 32 \n" |
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| 181 | " br 1b \n" |
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| 182 | "3: cmplti %0, 4 \n" /* 1W */ |
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| 183 | " bt 5f \n" |
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| 184 | "4: stw %2, (%1, 0) \n" |
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| 185 | " addi %1, 4 \n" |
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| 186 | " subi %0, 4 \n" |
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| 187 | " br 3b \n" |
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| 188 | "5: cmpnei %0, 0 \n" /* 1B */ |
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| 189 | "9: bf 7f \n" |
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| 190 | "6: stb %2, (%1, 0) \n" |
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| 191 | " addi %1, 1 \n" |
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| 192 | " subi %0, 1 \n" |
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| 193 | " br 5b \n" |
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| 194 | ".section __ex_table,\"a\" \n" |
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| 195 | ".align 2 \n" |
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| 196 | ".long 8b, 9b \n" |
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| 197 | ".long 10b, 9b \n" |
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| 198 | ".long 11b, 9b \n" |
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| 199 | ".long 12b, 9b \n" |
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| 200 | ".long 13b, 9b \n" |
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| 201 | ".long 14b, 9b \n" |
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| 202 | ".long 15b, 9b \n" |
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| 203 | ".long 16b, 9b \n" |
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| 204 | ".long 4b, 9b \n" |
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| 205 | ".long 6b, 9b \n" |
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| 206 | ".previous \n" |
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| 207 | "7: \n" |
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| 208 | : "=r" (n), "=r" (data), "=r" (value), "=r" (tmp) |
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| 209 | : "0" (n), "1" (to), "2" (0) |
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| 210 | : "memory" ); |
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| 211 | |
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| 212 | return n; |
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| 213 | } |
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| 214 | EXPORT_SYMBOL(__clear_user); |
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| 215 | |
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