start.S 1.7 KB

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  1. /*
  2. * (C) Copyright 2007, 2010
  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. #include <asm-offsets.h>
  21. #include <config.h>
  22. #include <version.h>
  23. .text
  24. .align 2
  25. .global _start
  26. _sh_start:
  27. mov.l ._lowlevel_init, r0
  28. 100: bsrf r0
  29. nop
  30. bsr 1f
  31. nop
  32. 1: sts pr, r5
  33. mov.l ._reloc_dst, r4
  34. add #(_sh_start-1b), r5
  35. mov.l ._reloc_dst_end, r6
  36. 2: mov.l @r5+, r1
  37. mov.l r1, @r4
  38. add #4, r4
  39. cmp/hs r6, r4
  40. bf 2b
  41. mov.l ._bss_start, r4
  42. mov.l ._bss_end, r5
  43. mov #0, r1
  44. 3: mov.l r1, @r4 /* bss clear */
  45. add #4, r4
  46. cmp/hs r5, r4
  47. bf 3b
  48. mov.l ._gd_init, r13 /* global data */
  49. mov.l ._stack_init, r15 /* stack */
  50. mov.l ._sh_generic_init, r0
  51. jsr @r0
  52. nop
  53. loop:
  54. bra loop
  55. .align 2
  56. ._lowlevel_init: .long (lowlevel_init - (100b + 4))
  57. ._reloc_dst: .long reloc_dst
  58. ._reloc_dst_end: .long reloc_dst_end
  59. ._bss_start: .long bss_start
  60. ._bss_end: .long bss_end
  61. ._gd_init: .long (_sh_start - GENERATED_GBL_DATA_SIZE)
  62. ._stack_init: .long (_sh_start - GENERATED_GBL_DATA_SIZE - CONFIG_SYS_MALLOC_LEN - 16)
  63. ._sh_generic_init: .long sh_generic_init