Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[pandora-kernel.git] / arch / m68k / lib / memcpy.c
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, temp1;
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 (n > 2 && (long)to & 2) {
26                 short *sto = to;
27                 const short *sfrom = from;
28                 *sto++ = *sfrom++;
29                 to = sto;
30                 from = sfrom;
31                 n -= 2;
32         }
33         temp = n >> 2;
34         if (temp) {
35                 long *lto = to;
36                 const long *lfrom = from;
37 #if defined(CONFIG_M68000) || defined(CONFIG_COLDFIRE)
38                 for (; temp; temp--)
39                         *lto++ = *lfrom++;
40 #else
41                 asm volatile (
42                         "       movel %2,%3\n"
43                         "       andw  #7,%3\n"
44                         "       lsrl  #3,%2\n"
45                         "       negw  %3\n"
46                         "       jmp   %%pc@(1f,%3:w:2)\n"
47                         "4:     movel %0@+,%1@+\n"
48                         "       movel %0@+,%1@+\n"
49                         "       movel %0@+,%1@+\n"
50                         "       movel %0@+,%1@+\n"
51                         "       movel %0@+,%1@+\n"
52                         "       movel %0@+,%1@+\n"
53                         "       movel %0@+,%1@+\n"
54                         "       movel %0@+,%1@+\n"
55                         "1:     dbra  %2,4b\n"
56                         "       clrw  %2\n"
57                         "       subql #1,%2\n"
58                         "       jpl   4b"
59                         : "=a" (lfrom), "=a" (lto), "=d" (temp), "=&d" (temp1)
60                         : "0" (lfrom), "1" (lto), "2" (temp));
61 #endif
62                 to = lto;
63                 from = lfrom;
64         }
65         if (n & 2) {
66                 short *sto = to;
67                 const short *sfrom = from;
68                 *sto++ = *sfrom++;
69                 to = sto;
70                 from = sfrom;
71         }
72         if (n & 1) {
73                 char *cto = to;
74                 const char *cfrom = from;
75                 *cto = *cfrom;
76         }
77         return xto;
78 }
79 EXPORT_SYMBOL(memcpy);