| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | ;;; memcpy.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 | |
| 12 | .text |
| 13 | .global SYMBOL_NAME(memcpy) |
| 14 | |
| 15 | ;;; void *memcpy(void *to, void *from, size_t n) |
| 16 | SYMBOL_NAME_LABEL(memcpy) |
| 17 | mov.l er2,er2 |
| 18 | bne 1f |
| 19 | rts |
| 20 | 1: |
| 21 | ;; address check |
| 22 | bld #0,r0l |
| 23 | bxor #0,r1l |
| 24 | bcs 4f |
| 25 | mov.l er4,@-sp |
| 26 | mov.l er0,@-sp |
| 27 | btst #0,r0l |
| 28 | beq 1f |
| 29 | ;; (aligned even) odd address |
| 30 | mov.b @er1,r3l |
| 31 | mov.b r3l,@er0 |
| 32 | adds #1,er1 |
| 33 | adds #1,er0 |
| 34 | dec.l #1,er2 |
| 35 | beq 3f |
| 36 | 1: |
| 37 | ;; n < sizeof(unsigned long) check |
| 38 | sub.l er4,er4 |
| 39 | adds #4,er4 ; loop count check value |
| 40 | cmp.l er4,er2 |
| 41 | blo 2f |
| 42 | ;; unsigned long copy |
| 43 | 1: |
| 44 | mov.l @er1,er3 |
| 45 | mov.l er3,@er0 |
| 46 | adds #4,er0 |
| 47 | adds #4,er1 |
| 48 | subs #4,er2 |
| 49 | cmp.l er4,er2 |
| 50 | bcc 1b |
| 51 | ;; rest |
| 52 | 2: |
| 53 | mov.l er2,er2 |
| 54 | beq 3f |
| 55 | 1: |
| 56 | mov.b @er1,r3l |
| 57 | mov.b r3l,@er0 |
| 58 | adds #1,er1 |
| 59 | adds #1,er0 |
| 60 | dec.l #1,er2 |
| 61 | bne 1b |
| 62 | 3: |
| 63 | mov.l @sp+,er0 |
| 64 | mov.l @sp+,er4 |
| 65 | rts |
| 66 | |
| 67 | ;; odd <- even / even <- odd |
| 68 | 4: |
| 69 | mov.l er4,er3 |
| 70 | mov.l er2,er4 |
| 71 | mov.l er5,er2 |
| 72 | mov.l er1,er5 |
| 73 | mov.l er6,er1 |
| 74 | mov.l er0,er6 |
| 75 | 1: |
| 76 | eepmov.w |
| 77 | mov.w r4,r4 |
| 78 | bne 1b |
| 79 | dec.w #1,e4 |
| 80 | bpl 1b |
| 81 | mov.l er1,er6 |
| 82 | mov.l er2,er5 |
| 83 | mov.l er3,er4 |
| 84 | rts |