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uclibc-ng
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libc
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sysdeps
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linux
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sh64
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crt0.S

crt0.S 2.2 KB
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  1. /* Startup code for SH5 & ELF.
    2. 

  2.    Copyright (C) 1999 Free Software Foundation, Inc.
    3. 

  3.    Copyright (C) 2001 Hewlett-Packard Australia
    4. 

  4. 

  5.    This file is part of the GNU C Library.
    6. 

  6. 

  7.    The GNU C Library is free software; you can redistribute it and/or
    8. 

  8.    modify it under the terms of the GNU Library General Public License as
    9. 

  9.    published by the Free Software Foundation; either version 2 of the
    10. 

  10.    License, or (at your option) any later version.
    11. 

  11. 

  12.    The GNU C Library is distributed in the hope that it will be useful,
    13. 

  13.    but WITHOUT ANY WARRANTY; without even the implied warranty of
    14. 

  14.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    15. 

  15.    Library General Public License for more details.
    16. 

  16. 

  17.    You should have received a copy of the GNU Library General Public
    18. 

  18.    License along with the GNU C Library; see the file COPYING.LIB.  If not,
    19. 

  19.    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    20. 

  20.    Boston, MA 02111-1307, USA.  */
    21. 

  21. 

  22. /* This is the canonical entry point, usually the first thing in the text
    23. 

  23.    segment.
    24. 

  24. 

  25. 	At this entry point, most registers' values are unspecified, except:
    26. 

  26. 

  27.    sp		The stack contains the arguments and environment:
    28. 

  28.    		0(sp)			argc
    29. 

  29. 		4(sp)			argv[0]
    30. 

  30. 		...
    31. 

  31. 		(4*argc)(sp)		NULL
    32. 

  32. 		(4*(argc+1))(sp)	envp[0]
    33. 

  33. 		...
    34. 

  34. 					NULL
    35. 

  35. */
    36. 

  36. 

  37. 	.file	"crt0.S"
    38. 

  38. 

  39. 	.globl _start
    40. 

  40. 	.globl __main
    41. 

  41. 

  42. 	.type	__uClibc_start_main,@function
    43. 

  43. 

  44. 	.section .text64,"xa"
    45. 

  45. 	.align 2	/* 2^2 = 4 */
    46. 

  46. 	
    47. 

  47. _start:
    48. 

  48. 	/* Clear the frame pointer since this is the outermost frame.  */
    49. 

  49. ###	mov #0, r14	# qqq
    50. 

  50. 

  51. 	/* Pop argc off the stack and save a pointer to argv */
    52. 

  52. 	ld.l	r15, 0, r2	/* argc */
    53. 

  53. 	addi	r15, 4, r3	/* argv */
    54. 

  54. 

  55. 	/* set up the value for the environment pointer r4 = (argc+1)*4+argv */
    56. 

  56. 	addi	r2, 1, r4	/* envp = argc + 1 */
    57. 

  57. 	shlli	r4, 2, r4	/* envp = envp * 4 */
    58. 

  58. 	add	r3, r4, r4	/* envp = envp + argv */
    59. 

  59. 

  60. 	/* call main() */
    61. 

  61. 	movi	__uClibc_start_main,r17
    62. 

  62. 	ptabs/l	r17,tr0
    63. 

  63. 	blink	tr0,r18
    64. 

  64. 

  65. 	/* should never get here....*/
    66. 

  66. ###	movi	abort@lh,r17
    67. 

  67. ###	shori	abort@ll,r17
    68. 

  68. 	ptabs/l	r17,tr0
    69. 

  69. 	blink	tr0,r63	/* call abort() => (r63) do not come back ... */
    70. 

  70. 

  71. 	/*
    72. 

  72. 	 *	The following is a stub to stop the GNU toolchain
    73. 

  73. 	 *	from calling its C-RTL initialization routines.
    74. 

  74. 	 */
    75. 

  75. __main:
    76. 

  76. 	ptabs/l	r18,tr0
    77. 

  77. 	blink	tr0,r63
    78. 

  78.