projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 66d83ab3 GU |
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 | */ | |
| 1da177e4 | 6 | |
| 66d83ab3 GU |
7 | #include <linux/module.h> |
| 8 | #include <linux/string.h> | |
| 1da177e4 | 9 | |
| 66d83ab3 | 10 | void *memcpy(void *to, const void *from, size_t n) |
| 1da177e4 | 11 | { |
| 66d83ab3 | 12 | void *xto = to; |
| 423c01ea | 13 | size_t temp; |
| 1da177e4 | 14 | |
| 66d83ab3 GU |
15 | if (!n) |
| 16 | return xto; | |
| 17 | if ((long)to & 1) { | |
| 18 | char *cto = to; | |
| 19 | const char *cfrom = from; | |
| 20 | *cto++ = *cfrom++; | |
| 21 | to = cto; | |
| 22 | from = cfrom; | |
| 23 | n--; | |
| 24 | } | |
| f230e80b GU |
25 | #if defined(CONFIG_M68000) |
| 26 | if ((long)from & 1) { | |
| 27 | char *cto = to; | |
| 28 | const char *cfrom = from; | |
| 29 | for (; n; n--) | |
| 30 | *cto++ = *cfrom++; | |
| 31 | return xto; | |
| 32 | } | |
| 33 | #endif | |
| 66d83ab3 GU |
34 | if (n > 2 && (long)to & 2) { |
| 35 | short *sto = to; | |
| 36 | const short *sfrom = from; | |
| 37 | *sto++ = *sfrom++; | |
| 38 | to = sto; | |
| 39 | from = sfrom; | |
| 40 | n -= 2; | |
| 41 | } | |
| 42 | temp = n >> 2; | |
| 43 | if (temp) { | |
| 44 | long *lto = to; | |
| 45 | const long *lfrom = from; | |
| 734c3ce3 GU |
46 | #if defined(CONFIG_M68000) || defined(CONFIG_COLDFIRE) |
| 47 | for (; temp; temp--) | |
| 48 | *lto++ = *lfrom++; | |
| 49 | #else | |
| 423c01ea | 50 | size_t temp1; |
| 66d83ab3 GU |
51 | asm volatile ( |
| 52 | " movel %2,%3\n" | |
| 53 | " andw #7,%3\n" | |
| 54 | " lsrl #3,%2\n" | |
| 55 | " negw %3\n" | |
| 56 | " jmp %%pc@(1f,%3:w:2)\n" | |
| 57 | "4: movel %0@+,%1@+\n" | |
| 58 | " movel %0@+,%1@+\n" | |
| 59 | " movel %0@+,%1@+\n" | |
| 60 | " movel %0@+,%1@+\n" | |
| 61 | " movel %0@+,%1@+\n" | |
| 62 | " movel %0@+,%1@+\n" | |
| 63 | " movel %0@+,%1@+\n" | |
| 64 | " movel %0@+,%1@+\n" | |
| 65 | "1: dbra %2,4b\n" | |
| 66 | " clrw %2\n" | |
| 67 | " subql #1,%2\n" | |
| 68 | " jpl 4b" | |
| 69 | : "=a" (lfrom), "=a" (lto), "=d" (temp), "=&d" (temp1) | |
| 70 | : "0" (lfrom), "1" (lto), "2" (temp)); | |
| 1da177e4 | 71 | #endif |
| 66d83ab3 GU |
72 | to = lto; |
| 73 | from = lfrom; | |
| 74 | } | |
| 75 | if (n & 2) { | |
| 76 | short *sto = to; | |
| 77 | const short *sfrom = from; | |
| 78 | *sto++ = *sfrom++; | |
| 79 | to = sto; | |
| 80 | from = sfrom; | |
| 81 | } | |
| 82 | if (n & 1) { | |
| 83 | char *cto = to; | |
| 84 | const char *cfrom = from; | |
| 85 | *cto = *cfrom; | |
| 86 | } | |
| 87 | return xto; | |
| 1da177e4 | 88 | } |
| 66d83ab3 | 89 | EXPORT_SYMBOL(memcpy); |