| Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| Yoshinori Sato | a71a29d | 2015-01-28 02:48:15 +0900 | [diff] [blame] | 2 | /* memset.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 | |
| 14 | .global memset |
| 15 | .global clear_user |
| 16 | |
| 17 | ;;void *memset(*ptr, int c, size_t count) |
| 18 | ;; ptr = er0 |
| 19 | ;; c = er1(r1l) |
| 20 | ;; count = er2 |
| 21 | memset: |
| 22 | btst #0,r0l |
| 23 | beq 2f |
| 24 | |
| 25 | ;; odd address |
| 26 | 1: |
| 27 | mov.b r1l,@er0 |
| 28 | adds #1,er0 |
| 29 | dec.l #1,er2 |
| 30 | beq 6f |
| 31 | |
| 32 | ;; even address |
| 33 | 2: |
| 34 | mov.l er2,er3 |
| 35 | cmp.l #4,er2 |
| 36 | blo 4f |
| 37 | ;; count>=4 -> count/4 |
| 38 | #if defined(CONFIG_CPU_H8300H) |
| 39 | shlr.l er2 |
| 40 | shlr.l er2 |
| 41 | #endif |
| 42 | #if defined(CONFIG_CPU_H8S) |
| 43 | shlr.l #2,er2 |
| 44 | #endif |
| 45 | ;; byte -> long |
| 46 | mov.b r1l,r1h |
| 47 | mov.w r1,e1 |
| 48 | 3: |
| 49 | mov.l er1,@er0 |
| 50 | adds #4,er0 |
| 51 | dec.l #1,er2 |
| 52 | bne 3b |
| 53 | 4: |
| 54 | ;; count % 4 |
| 55 | and.b #3,r3l |
| 56 | beq 6f |
| 57 | 5: |
| 58 | mov.b r1l,@er0 |
| 59 | adds #1,er0 |
| 60 | dec.b r3l |
| 61 | bne 5b |
| 62 | 6: |
| 63 | rts |
| 64 | |
| 65 | clear_user: |
| 66 | mov.l er1, er2 |
| 67 | sub.l er1, er1 |
| 68 | bra memset |
| 69 | |
| 70 | .end |