crt0.S 1.8 KB

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  1. /* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. The GNU C Library is free software; you can redistribute it and/or
  4. modify it under the terms of the GNU Library General Public License as
  5. published by the Free Software Foundation; either version 2 of the
  6. License, or (at your option) any later version.
  7. The GNU C Library is distributed in the hope that it will be useful,
  8. but WITHOUT ANY WARRANTY; without even the implied warranty of
  9. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  10. Library General Public License for more details.
  11. You should have received a copy of the GNU Library General Public
  12. License along with the GNU C Library; see the file COPYING.LIB. If
  13. not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  14. Cambridge, MA 02139, USA. */
  15. /*
  16. * NOTE: this file works for PIC and non-PIC code. Be very careful how
  17. * you modify it !
  18. */
  19. #include <features.h>
  20. .global _start
  21. .global __exit
  22. .global atexit
  23. .global main
  24. .text
  25. nop
  26. nop
  27. _start: /* put here so that references to _start work with elf-PIC */
  28. movea.l %d5, %a5 /* uClinux passes in data segment here */
  29. /*
  30. * argc, argv and envp are on the stack, just call to main
  31. */
  32. lea __uClibc_main-.-8, %a0 /* call uClibc main */
  33. jsr %pc@(%a0)
  34. /* If that didn't kill us, ... */
  35. __exit:
  36. move.l %sp@+,%d1
  37. moveq #1,%d0 /* __NR_exit */
  38. trap #0
  39. /*
  40. * this was needed for gcc/g++-builds, atexit was not getting included
  41. * for some stupid reason, this gets us a compiler
  42. */
  43. empty_func:
  44. rts
  45. #if defined(__HAVE_ELF__)
  46. .weak atexit
  47. atexit = empty_func
  48. #else
  49. .set atexit,empty_func
  50. #endif
  51. /* Define a symbol for the first piece of initialized data. */
  52. .data
  53. .globl __data_start
  54. __data_start:
  55. .long 0
  56. .weak data_start
  57. data_start = __data_start