| 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 | */ |
|---|
| 6 | |
|---|
| 7 | #include <linux/module.h> |
|---|
| 8 | #include <linux/string.h> |
|---|
| 9 | |
|---|
| 10 | void *memcpy(void *to, const void *from, size_t n) |
|---|
| 11 | { |
|---|
| 12 | void *xto = to; |
|---|
| 13 | size_t temp; |
|---|
| 14 | |
|---|
| 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 | } |
|---|
| 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 |
|---|
| 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; |
|---|
| 46 | #if defined(CONFIG_M68000) || defined(CONFIG_COLDFIRE) |
|---|
| 47 | for (; temp; temp--) |
|---|
| 48 | *lto++ = *lfrom++; |
|---|
| 49 | #else |
|---|
| 50 | size_t temp1; |
|---|
| 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)); |
|---|
| 71 | #endif |
|---|
| 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; |
|---|
| 88 | } |
|---|
| 89 | EXPORT_SYMBOL(memcpy); |
|---|
| 90 | |
|---|
