Last change
on this file since 444 was
444,
checked in by satin@…, 6 years ago
|
add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
|
File size:
691 bytes
|
Rev | Line | |
---|
[444] | 1 | /* |
---|
| 2 | * C library strcpy routine |
---|
| 3 | * |
---|
| 4 | * This routine has been optimized for the CPU32+. |
---|
| 5 | * It should run on all 68k machines. |
---|
| 6 | * |
---|
| 7 | * W. Eric Norum |
---|
| 8 | * Saskatchewan Accelerator Laboratory |
---|
| 9 | * University of Saskatchewan |
---|
| 10 | * Saskatoon, Saskatchewan, CANADA |
---|
| 11 | * eric@skatter.usask.ca |
---|
| 12 | */ |
---|
| 13 | |
---|
| 14 | #include <string.h> |
---|
| 15 | |
---|
| 16 | /* |
---|
| 17 | * Copy bytes using CPU32+ loop mode if possible |
---|
| 18 | */ |
---|
| 19 | |
---|
| 20 | char * |
---|
| 21 | strcpy (char *to, const char *from) |
---|
| 22 | { |
---|
| 23 | char *pto = to; |
---|
| 24 | unsigned int n = 0xFFFF; |
---|
| 25 | |
---|
| 26 | asm volatile ("1:\n" |
---|
| 27 | "\tmove.b (%0)+,(%1)+\n" |
---|
| 28 | #if defined(__mcpu32__) |
---|
| 29 | "\tdbeq %2,1b\n" |
---|
| 30 | #endif |
---|
| 31 | "\tbne.b 1b\n" : |
---|
| 32 | "=a" (from), "=a" (pto), "=d" (n) : |
---|
| 33 | "0" (from), "1" (pto), "2" (n) : |
---|
| 34 | "cc", "memory"); |
---|
| 35 | return to; |
---|
| 36 | } |
---|
Note: See
TracBrowser
for help on using the repository browser.