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start.S

start.S 1.2 KB
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  1. /*
    2. 

  2.  * (C) Copyright 2007
    3. 

  3.  * Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
    4. 

  4.  *
    5. 

  5.  * (C) Copyright 2007
    6. 

  6.  * Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
    7. 

  7.  *
    8. 

  8.  * SPDX-License-Identifier:	GPL-2.0+
    9. 

  9.  */
    10. 

  10. 

  11. #include <asm-offsets.h>
    12. 

  12. #include <config.h>
    13. 

  13. 

  14. 	.text
    15. 

  15. 	.align	2
    16. 

  16. 

  17. 	.global	_start
    18. 

  18. _sh_start:
    19. 

  19. 	mov.l	._lowlevel_init, r0
    20. 

  20. 100:	bsrf	r0
    21. 

  21. 	nop
    22. 

  22. 

  23. 	bsr	1f
    24. 

  24. 	nop
    25. 

  25. 1:	sts	pr, r5
    26. 

  26. 	mov.l	._reloc_dst, r4
    27. 

  27. 	add	#(_sh_start-1b), r5
    28. 

  28. 	mov.l	._reloc_dst_end, r6
    29. 

  29. 

  30. 2:	mov.l	@r5+, r1
    31. 

  31. 	mov.l	r1, @r4
    32. 

  32. 	add	#4, r4
    33. 

  33. 	cmp/hs	r6, r4
    34. 

  34. 	bf	2b
    35. 

  35. 

  36. 	mov.l	._bss_start, r4
    37. 

  37. 	mov.l	._bss_end, r5
    38. 

  38. 	mov	#0, r1
    39. 

  39. 

  40. 3:	mov.l	r1, @r4			/* bss clear */
    41. 

  41. 	add	#4, r4
    42. 

  42. 	cmp/hs	r5, r4
    43. 

  43. 	bf	3b
    44. 

  44. 

  45. 	mov.l	._gd_init, r13		/* global data */
    46. 

  46. 	mov.l	._stack_init, r15	/* stack */
    47. 

  47. 

  48. 	#TODO(sh maintainer): Fix this up to call the correct code
    49. 

  49. 	#mov.l	._sh_generic_init, r0
    50. 

  50. 	#jsr	@r0
    51. 

  51. 	nop
    52. 

  52. 

  53. loop:
    54. 

  54. 	bra	loop
    55. 

  55. 

  56. 	.align	2
    57. 

  57. 

  58. ._lowlevel_init:	.long	(lowlevel_init - (100b + 4))
    59. 

  59. ._reloc_dst:		.long	reloc_dst
    60. 

  60. ._reloc_dst_end:	.long	reloc_dst_end
    61. 

  61. ._bss_start:		.long	bss_start
    62. 

  62. ._bss_end:		.long	bss_end
    63. 

  63. ._gd_init:		.long	(_sh_start - GENERATED_GBL_DATA_SIZE)
    64. 

  64. ._stack_init:	.long	(_sh_start - GENERATED_GBL_DATA_SIZE - CONFIG_SYS_MALLOC_LEN - 16)
    65. 

  65. #._sh_generic_init:	.long	sh_generic_init
    66.