cpu/sh3/start.S

   1 /*
   2  * (C) Copyright 2007
   3  * Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
   4  *
   5  * (C) Copyright 2007
   6  * Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <config.h>
  25 #include <version.h>
  26
  27         .text
  28         .align  2
  29
  30         .global _start
  31 _start:
  32         mov.l   ._lowlevel_init, r0
  33 100:    bsrf    r0
  34         nop
  35
  36         bsr     1f
  37         nop
  38 1:      sts     pr, r5
  39         mov.l   ._reloc_dst, r4
  40         add     #(_start-1b), r5
  41         mov.l   ._reloc_dst_end, r6
  42
  43 2:      mov.l   @r5+, r1
  44         mov.l   r1, @r4
  45         add     #4, r4
  46         cmp/hs  r6, r4
  47         bf      2b
  48
  49         mov.l   ._bss_start, r4
  50         mov.l   ._bss_end, r5
  51         mov     #0, r1
  52
  53 3:      mov.l   r1, @r4                 /* bss clear */
  54         add     #4, r4
  55         cmp/hs  r5, r4
  56         bf      3b
  57
  58         mov.l   ._gd_init, r13          /* global data */
  59         mov.l   ._stack_init, r15       /* stack */
  60
  61         mov.l   ._sh_generic_init, r0
  62         jsr     @r0
  63         nop
  64
  65 loop:
  66         bra     loop
  67
  68         .align  2
  69
  70 ._lowlevel_init:        .long   (lowlevel_init - (100b + 4))
  71 ._reloc_dst:            .long   reloc_dst
  72 ._reloc_dst_end:        .long   reloc_dst_end
  73 ._bss_start:            .long   bss_start
  74 ._bss_end:              .long   bss_end
  75 ._gd_init:              .long   (_start - CONFIG_SYS_GBL_DATA_SIZE)
  76 ._stack_init:   .long   (_start - CONFIG_SYS_GBL_DATA_SIZE - CONFIG_SYS_MALLOC_LEN - 16)
  77 ._sh_generic_init:      .long   sh_generic_init