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start.S

start.S 1.3 KB
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  1. /*
    2. 

  2.  * Copyright (C) 2007,2008 Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
    3. 

  3.  * Copyright (C) 2008 Renesas Solutions Corp.
    4. 

  4. 

  5.  * SPDX-License-Identifier:	GPL-2.0+
    6. 

  6.  */
    7. 

  7. 

  8. #include <asm-offsets.h>
    9. 

  9. #include <config.h>
    10. 

  10. 

  11. 	.text
    12. 

  12. 	.align	2
    13. 

  13. 

  14. 	.global	_start
    15. 

  15. _sh_start:
    16. 

  16. 	.long 0x00000010	/* Ppower ON reset PC*/
    17. 

  17. 	.long 0x00000000
    18. 

  18. 	.long 0x00000010	/* Manual reset PC */
    19. 

  19. 	.long 0x00000000
    20. 

  20. _init:
    21. 

  21. 	mov.l	._lowlevel_init, r0
    22. 

  22. 100:	bsrf	r0
    23. 

  23. 	nop
    24. 

  24. 	bsr	1f
    25. 

  25. 	nop
    26. 

  26. 1:	sts	pr, r5
    27. 

  27. 	mov.l	._reloc_dst, r4
    28. 

  28. 	add	#(_sh_start-1b), r5
    29. 

  29. 	mov.l	._reloc_dst_end, r6
    30. 

  30. 

  31. 2:	mov.l	@r5+, r1
    32. 

  32. 	mov.l	r1, @r4
    33. 

  33. 	add	#4, r4
    34. 

  34. 	cmp/hs	r6, r4
    35. 

  35. 	bf	2b
    36. 

  36. 

  37. 	mov.l	._bss_start, r4
    38. 

  38. 	mov.l	._bss_end, r5
    39. 

  39. 	mov	#0, r1
    40. 

  40. 

  41. 3:	mov.l	r1, @r4			/* bss clear */
    42. 

  42. 	add	#4, r4
    43. 

  43. 	cmp/hs	r5, r4
    44. 

  44. 	bf	3b
    45. 

  45. 

  46. 	mov.l	._gd_init, r13		/* global data */
    47. 

  47. 	mov.l	._stack_init, r15	/* stack */
    48. 

  48. 

  49. 	#TODO(sh maintainer): Fix this up to call the correct code
    50. 

  50. 	#mov.l	._sh_generic_init, r0
    51. 

  51. 	#jsr	@r0
    52. 

  52. 	nop
    53. 

  53. 

  54. loop:
    55. 

  55. 	bra	loop
    56. 

  56. 

  57. 	.align	2
    58. 

  58. 

  59. ._lowlevel_init:	.long	(lowlevel_init - (100b + 4))
    60. 

  60. ._reloc_dst:		.long	reloc_dst
    61. 

  61. ._reloc_dst_end:	.long	reloc_dst_end
    62. 

  62. ._bss_start:		.long	bss_start
    63. 

  63. ._bss_end:		.long	bss_end
    64. 

  64. ._gd_init:		.long	(_sh_start - GENERATED_GBL_DATA_SIZE)
    65. 

  65. ._stack_init:	.long	(_sh_start - GENERATED_GBL_DATA_SIZE - CONFIG_SYS_MALLOC_LEN - 16)
    66. 

  66. #._sh_generic_init:	.long	sh_generic_init
    67.