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209 lines
3.8 KiB
209 lines
3.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/string.h> |
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#include <linux/export.h> |
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#undef memcpy |
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#undef memset |
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__visible void *memcpy(void *to, const void *from, size_t n) |
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{ |
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#if defined(CONFIG_X86_USE_3DNOW) && !defined(CONFIG_FORTIFY_SOURCE) |
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return __memcpy3d(to, from, n); |
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#else |
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return __memcpy(to, from, n); |
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#endif |
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} |
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EXPORT_SYMBOL(memcpy); |
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__visible void *memset(void *s, int c, size_t count) |
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{ |
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return __memset(s, c, count); |
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} |
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EXPORT_SYMBOL(memset); |
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__visible void *memmove(void *dest, const void *src, size_t n) |
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{ |
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int d0,d1,d2,d3,d4,d5; |
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char *ret = dest; |
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__asm__ __volatile__( |
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/* Handle more 16 bytes in loop */ |
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"cmp $0x10, %0\n\t" |
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"jb 1f\n\t" |
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/* Decide forward/backward copy mode */ |
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"cmp %2, %1\n\t" |
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"jb 2f\n\t" |
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/* |
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* movs instruction have many startup latency |
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* so we handle small size by general register. |
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*/ |
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"cmp $680, %0\n\t" |
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"jb 3f\n\t" |
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/* |
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* movs instruction is only good for aligned case. |
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*/ |
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"mov %1, %3\n\t" |
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"xor %2, %3\n\t" |
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"and $0xff, %3\n\t" |
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"jz 4f\n\t" |
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"3:\n\t" |
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"sub $0x10, %0\n\t" |
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/* |
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* We gobble 16 bytes forward in each loop. |
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*/ |
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"3:\n\t" |
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"sub $0x10, %0\n\t" |
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"mov 0*4(%1), %3\n\t" |
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"mov 1*4(%1), %4\n\t" |
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"mov %3, 0*4(%2)\n\t" |
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"mov %4, 1*4(%2)\n\t" |
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"mov 2*4(%1), %3\n\t" |
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"mov 3*4(%1), %4\n\t" |
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"mov %3, 2*4(%2)\n\t" |
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"mov %4, 3*4(%2)\n\t" |
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"lea 0x10(%1), %1\n\t" |
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"lea 0x10(%2), %2\n\t" |
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"jae 3b\n\t" |
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"add $0x10, %0\n\t" |
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"jmp 1f\n\t" |
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/* |
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* Handle data forward by movs. |
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*/ |
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".p2align 4\n\t" |
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"4:\n\t" |
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"mov -4(%1, %0), %3\n\t" |
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"lea -4(%2, %0), %4\n\t" |
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"shr $2, %0\n\t" |
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"rep movsl\n\t" |
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"mov %3, (%4)\n\t" |
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"jmp 11f\n\t" |
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/* |
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* Handle data backward by movs. |
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*/ |
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".p2align 4\n\t" |
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"6:\n\t" |
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"mov (%1), %3\n\t" |
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"mov %2, %4\n\t" |
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"lea -4(%1, %0), %1\n\t" |
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"lea -4(%2, %0), %2\n\t" |
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"shr $2, %0\n\t" |
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"std\n\t" |
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"rep movsl\n\t" |
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"mov %3,(%4)\n\t" |
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"cld\n\t" |
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"jmp 11f\n\t" |
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/* |
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* Start to prepare for backward copy. |
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*/ |
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".p2align 4\n\t" |
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"2:\n\t" |
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"cmp $680, %0\n\t" |
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"jb 5f\n\t" |
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"mov %1, %3\n\t" |
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"xor %2, %3\n\t" |
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"and $0xff, %3\n\t" |
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"jz 6b\n\t" |
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/* |
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* Calculate copy position to tail. |
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*/ |
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"5:\n\t" |
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"add %0, %1\n\t" |
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"add %0, %2\n\t" |
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"sub $0x10, %0\n\t" |
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/* |
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* We gobble 16 bytes backward in each loop. |
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*/ |
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"7:\n\t" |
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"sub $0x10, %0\n\t" |
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"mov -1*4(%1), %3\n\t" |
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"mov -2*4(%1), %4\n\t" |
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"mov %3, -1*4(%2)\n\t" |
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"mov %4, -2*4(%2)\n\t" |
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"mov -3*4(%1), %3\n\t" |
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"mov -4*4(%1), %4\n\t" |
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"mov %3, -3*4(%2)\n\t" |
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"mov %4, -4*4(%2)\n\t" |
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"lea -0x10(%1), %1\n\t" |
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"lea -0x10(%2), %2\n\t" |
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"jae 7b\n\t" |
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/* |
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* Calculate copy position to head. |
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*/ |
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"add $0x10, %0\n\t" |
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"sub %0, %1\n\t" |
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"sub %0, %2\n\t" |
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/* |
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* Move data from 8 bytes to 15 bytes. |
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*/ |
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".p2align 4\n\t" |
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"1:\n\t" |
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"cmp $8, %0\n\t" |
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"jb 8f\n\t" |
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"mov 0*4(%1), %3\n\t" |
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"mov 1*4(%1), %4\n\t" |
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"mov -2*4(%1, %0), %5\n\t" |
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"mov -1*4(%1, %0), %1\n\t" |
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"mov %3, 0*4(%2)\n\t" |
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"mov %4, 1*4(%2)\n\t" |
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"mov %5, -2*4(%2, %0)\n\t" |
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"mov %1, -1*4(%2, %0)\n\t" |
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"jmp 11f\n\t" |
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/* |
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* Move data from 4 bytes to 7 bytes. |
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*/ |
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".p2align 4\n\t" |
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"8:\n\t" |
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"cmp $4, %0\n\t" |
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"jb 9f\n\t" |
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"mov 0*4(%1), %3\n\t" |
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"mov -1*4(%1, %0), %4\n\t" |
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"mov %3, 0*4(%2)\n\t" |
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"mov %4, -1*4(%2, %0)\n\t" |
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"jmp 11f\n\t" |
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/* |
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* Move data from 2 bytes to 3 bytes. |
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*/ |
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".p2align 4\n\t" |
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"9:\n\t" |
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"cmp $2, %0\n\t" |
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"jb 10f\n\t" |
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"movw 0*2(%1), %%dx\n\t" |
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"movw -1*2(%1, %0), %%bx\n\t" |
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"movw %%dx, 0*2(%2)\n\t" |
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"movw %%bx, -1*2(%2, %0)\n\t" |
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"jmp 11f\n\t" |
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/* |
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* Move data for 1 byte. |
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*/ |
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".p2align 4\n\t" |
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"10:\n\t" |
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"cmp $1, %0\n\t" |
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"jb 11f\n\t" |
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"movb (%1), %%cl\n\t" |
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"movb %%cl, (%2)\n\t" |
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".p2align 4\n\t" |
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"11:" |
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: "=&c" (d0), "=&S" (d1), "=&D" (d2), |
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"=r" (d3),"=r" (d4), "=r"(d5) |
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:"0" (n), |
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"1" (src), |
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"2" (dest) |
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:"memory"); |
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return ret; |
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} |
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EXPORT_SYMBOL(memmove);
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