clone.S 1.7 KB

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  1. /* Copyright (C) 1996, 1997, 1998, 2000 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. Contributed by Richard Henderson (rth@tamu.edu).
  4. The GNU C Library is free software; you can redistribute it and/or
  5. modify it under the terms of the GNU Lesser General Public
  6. License as published by the Free Software Foundation; either
  7. version 2.1 of the License, or (at your option) any later version.
  8. The GNU C Library is distributed in the hope that it will be useful,
  9. but WITHOUT ANY WARRANTY; without even the implied warranty of
  10. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11. Lesser General Public License for more details.
  12. You should have received a copy of the GNU Lesser General Public
  13. License along with the GNU C Library; if not, write to the Free
  14. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  15. 02111-1307 USA. */
  16. /* clone() is even more special than fork() as it mucks with stacks
  17. and invokes a function in the right context after its all over. */
  18. #include <asm/unistd.h>
  19. /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */
  20. .text
  21. .global __clone
  22. .type __clone,%function
  23. .align 4
  24. __clone:
  25. save %sp,-96,%sp
  26. /* sanity check arguments */
  27. tst %i0
  28. be __error
  29. orcc %i1,%g0,%o1
  30. be __error
  31. mov %i2,%o0
  32. /* Do the system call */
  33. set __NR_clone,%g1
  34. ta 0x10
  35. bcs __error
  36. tst %o1
  37. bne __thread_start
  38. nop
  39. ret
  40. restore %o0,%g0,%o0
  41. __error:
  42. jmp __syscall_error
  43. .size __clone,.-__clone
  44. .type __thread_start,%function
  45. __thread_start:
  46. call %i0
  47. mov %i3,%o0
  48. call _exit_internal,0
  49. nop
  50. .size __thread_start,.-__thread_start
  51. .weak clone
  52. clone = __clone