blob: ccc914193d7cec0d64796f984a724414122d3b11 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
|
/*
* C library strcpy routine
*
* This routine has been optimized for the CPU32+.
* It should run on all 68k machines.
*
* W. Eric Norum
* Saskatchewan Accelerator Laboratory
* University of Saskatchewan
* Saskatoon, Saskatchewan, CANADA
* eric@skatter.usask.ca
*/
#include <string.h>
/*
* Copy bytes using CPU32+ loop mode if possible
*/
char *
strcpy (char *to, const char *from)
{
char *pto = to;
unsigned int n = 0xFFFF;
asm volatile ("1:\n"
"\tmove.b (%0)+,(%1)+\n"
#if defined(__mcpu32__)
"\tdbeq %2,1b\n"
#endif
"\tbne.b 1b\n" :
"=a" (from), "=a" (pto), "=d" (n) :
"0" (from), "1" (pto), "2" (n) :
"cc", "memory");
return to;
}
|
