projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* memset.S */ |
| 2 | ||
| 3 | #include <asm/linkage.h> | |
| 4 | ||
| 5 | #if defined(__H8300H__) | |
| 6 | .h8300h | |
| 7 | #endif | |
| 8 | #if defined(__H8300S__) | |
| 9 | .h8300s | |
| 10 | #endif | |
| 11 | .text | |
| 12 | ||
| db5ede6f | 13 | .global _memset |
| 1da177e4 LT |
14 | |
| 15 | ;;void *memset(*ptr, int c, size_t count) | |
| 16 | ;; ptr = er0 | |
| 17 | ;; c = er1(r1l) | |
| 18 | ;; count = er2 | |
| db5ede6f | 19 | _memset: |
| 1da177e4 LT |
20 | btst #0,r0l |
| 21 | beq 2f | |
| 22 | ||
| 23 | ;; odd address | |
| 24 | 1: | |
| 25 | mov.b r1l,@er0 | |
| 26 | adds #1,er0 | |
| 27 | dec.l #1,er2 | |
| 28 | beq 6f | |
| 29 | ||
| 30 | ;; even address | |
| 31 | 2: | |
| 32 | mov.l er2,er3 | |
| 33 | cmp.l #4,er2 | |
| 34 | blo 4f | |
| 35 | ;; count>=4 -> count/4 | |
| 36 | #if defined(__H8300H__) | |
| 37 | shlr.l er2 | |
| 38 | shlr.l er2 | |
| 39 | #endif | |
| 40 | #if defined(__H8300S__) | |
| 41 | shlr.l #2,er2 | |
| 42 | #endif | |
| 43 | ;; byte -> long | |
| 44 | mov.b r1l,r1h | |
| 45 | mov.w r1,e1 | |
| 46 | 3: | |
| 47 | mov.l er1,@er0 | |
| 48 | adds #4,er0 | |
| 49 | dec.l #1,er2 | |
| 50 | bne 3b | |
| 51 | 4: | |
| 52 | ;; count % 4 | |
| 53 | and.b #3,r3l | |
| 54 | beq 6f | |
| 55 | 5: | |
| 56 | mov.b r1l,@er0 | |
| 57 | adds #1,er0 | |
| 58 | dec.b r3l | |
| 59 | bne 5b | |
| 60 | 6: | |
| 61 | rts |