| /* memset.S */ |
| |
| #include <asm/linkage.h> |
| |
| #if defined(__H8300H__) |
| .h8300h |
| #endif |
| #if defined(__H8300S__) |
| .h8300s |
| #endif |
| .text |
| |
| .global SYMBOL_NAME(memset) |
| |
| ;;void *memset(*ptr, int c, size_t count) |
| ;; ptr = er0 |
| ;; c = er1(r1l) |
| ;; count = er2 |
| SYMBOL_NAME_LABEL(memset) |
| btst #0,r0l |
| beq 2f |
| |
| ;; odd address |
| 1: |
| mov.b r1l,@er0 |
| adds #1,er0 |
| dec.l #1,er2 |
| beq 6f |
| |
| ;; even address |
| 2: |
| mov.l er2,er3 |
| cmp.l #4,er2 |
| blo 4f |
| ;; count>=4 -> count/4 |
| #if defined(__H8300H__) |
| shlr.l er2 |
| shlr.l er2 |
| #endif |
| #if defined(__H8300S__) |
| shlr.l #2,er2 |
| #endif |
| ;; byte -> long |
| mov.b r1l,r1h |
| mov.w r1,e1 |
| 3: |
| mov.l er1,@er0 |
| adds #4,er0 |
| dec.l #1,er2 |
| bne 3b |
| 4: |
| ;; count % 4 |
| and.b #3,r3l |
| beq 6f |
| 5: |
| mov.b r1l,@er0 |
| adds #1,er0 |
| dec.b r3l |
| bne 5b |
| 6: |
| rts |