cpu/sh4/start.S

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