projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | ;;; SPDX-License-Identifier: GPL-2.0 |
| a71a29de YS |
2 | ;;; memcpy.S |
| 3 | ||
| 4 | #include <asm/linkage.h> | |
| 5 | ||
| 6 | #if defined(CONFIG_CPU_H8300H) | |
| 7 | .h8300h | |
| 8 | #endif | |
| 9 | #if defined(CONFIG_CPU_H8S) | |
| 10 | .h8300s | |
| 11 | #endif | |
| 12 | .text | |
| 13 | .global memcpy | |
| 14 | ||
| 15 | ;;; void *memcpy(void *to, void *from, size_t n) | |
| 16 | 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 | |
| 85 | ||
| 86 | .end |