LXR linux/arch/h8300/lib/memset.S

   1/* SPDX-License-Identifier: GPL-2.0 */
   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
  21memset:
  22        btst    #0,r0l
  23        beq     2f
  24
  25        ;; odd address
  261:
  27        mov.b   r1l,@er0
  28        adds    #1,er0
  29        dec.l   #1,er2
  30        beq     6f
  31
  32        ;; even address
  332:
  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
  483:
  49        mov.l   er1,@er0
  50        adds    #4,er0
  51        dec.l   #1,er2
  52        bne     3b
  534:
  54        ;; count % 4
  55        and.b   #3,r3l
  56        beq     6f
  575:
  58        mov.b   r1l,@er0
  59        adds    #1,er0
  60        dec.b   r3l
  61        bne     5b
  626:
  63        rts
  64
  65clear_user:
  66        mov.l   er1, er2
  67        sub.l   er1, er1
  68        bra     memset
  69
  70        .end
  71