arch/arc/lib/memset.S

   1 /*
   2  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #include <linux/linkage.h>
  10
  11 #define SMALL   7 /* Must be at least 6 to deal with alignment/loop issues.  */
  12
  13 ENTRY_CFI(memset)
  14         mov_s   r4,r0
  15         or      r12,r0,r2
  16         bmsk.f  r12,r12,1
  17         extb_s  r1,r1
  18         asl     r3,r1,8
  19         beq.d   .Laligned
  20         or_s    r1,r1,r3
  21         brls    r2,SMALL,.Ltiny
  22         add     r3,r2,r0
  23         stb     r1,[r3,-1]
  24         bclr_s  r3,r3,0
  25         stw     r1,[r3,-2]
  26         bmsk.f  r12,r0,1
  27         add_s   r2,r2,r12
  28         sub.ne  r2,r2,4
  29         stb.ab  r1,[r4,1]
  30         and     r4,r4,-2
  31         stw.ab  r1,[r4,2]
  32         and     r4,r4,-4
  33 .Laligned:      ; This code address should be aligned for speed.
  34         asl     r3,r1,16
  35         lsr.f   lp_count,r2,2
  36         or_s    r1,r1,r3
  37         lpne    .Loop_end
  38         st.ab   r1,[r4,4]
  39 .Loop_end:
  40         j_s     [blink]
  41
  42         .balign 4
  43 .Ltiny:
  44         mov.f   lp_count,r2
  45         lpne    .Ltiny_end
  46         stb.ab  r1,[r4,1]
  47 .Ltiny_end:
  48         j_s     [blink]
  49 END_CFI(memset)
  50
  51 ; memzero: @r0 = mem, @r1 = size_t
  52 ; memset:  @r0 = mem, @r1 = char, @r2 = size_t
  53
  54 ENTRY_CFI(memzero)
  55     ; adjust bzero args to memset args
  56     mov r2, r1
  57     mov r1, 0
  58     b  memset    ;tail call so need to tinker with blink
  59 END_CFI(memzero)