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

   1/* memset.S */
   2
   3#include <asm/linkage.h>
   4
   5#if defined(CONFIG_CPU_H8300H)
   6        .h8300h
   7#endif
   8#if defined(CONFIG_CPU_H8S)
   9        .h8300s
  10#endif
  11        .text
  12
  13.global memset
  14.global clear_user
  15
  16;;void *memset(*ptr, int c, size_t count)
  17;; ptr = er0
  18;; c   = er1(r1l)
  19;; count = er2
  20memset:
  21        btst    #0,r0l
  22        beq     2f
  23
  24        ;; odd address
  251:
  26        mov.b   r1l,@er0
  27        adds    #1,er0
  28        dec.l   #1,er2
  29        beq     6f
  30
  31        ;; even address
  322:
  33        mov.l   er2,er3
  34        cmp.l   #4,er2
  35        blo     4f
  36        ;; count>=4 -> count/4
  37#if defined(CONFIG_CPU_H8300H)
  38        shlr.l  er2
  39        shlr.l  er2
  40#endif
  41#if defined(CONFIG_CPU_H8S)
  42        shlr.l  #2,er2
  43#endif
  44        ;; byte -> long
  45        mov.b   r1l,r1h
  46        mov.w   r1,e1
  473:
  48        mov.l   er1,@er0
  49        adds    #4,er0
  50        dec.l   #1,er2
  51        bne     3b
  524:
  53        ;; count % 4
  54        and.b   #3,r3l
  55        beq     6f
  565:
  57        mov.b   r1l,@er0
  58        adds    #1,er0
  59        dec.b   r3l
  60        bne     5b
  616:
  62        rts
  63
  64clear_user:
  65        mov.l   er1, er2
  66        sub.l   er1, er1
  67        bra     memset
  68
  69        .end
  70