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| /* SPDX-License-Identifier: GPL-2.0 */
| /* memset.S */
|
| #include <asm/linkage.h>
|
| #if defined(CONFIG_CPU_H8300H)
| .h8300h
| #endif
| #if defined(CONFIG_CPU_H8S)
| .h8300s
| #endif
| .text
|
| .global memset
| .global clear_user
|
| ;;void *memset(*ptr, int c, size_t count)
| ;; ptr = er0
| ;; c = er1(r1l)
| ;; count = er2
| 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(CONFIG_CPU_H8300H)
| shlr.l er2
| shlr.l er2
| #endif
| #if defined(CONFIG_CPU_H8S)
| 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
|
| clear_user:
| mov.l er1, er2
| sub.l er1, er1
| bra memset
|
| .end
|
|
