vfork.S 1.3 KB

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  1. /* Copyright (C) 1999 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. Contributed by Jakub Jelinek <jj@ultra.linux.cz>, 1999.
  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, see
  14. <http://www.gnu.org/licenses/>. */
  15. #include <sys/syscall.h>
  16. #ifndef __NR_vfork
  17. /* No vfork so use fork instead */
  18. # define __NR_vfork __NR_fork
  19. #endif
  20. .text
  21. .global __vfork
  22. .hidden __vfork
  23. .type __vfork,%function
  24. .align 4
  25. __vfork:
  26. mov __NR_vfork, %g1
  27. ta 0x10
  28. bcc,a 9000f
  29. nop
  30. save %sp,-96,%sp
  31. call __errno_location
  32. nop
  33. st %i0,[%o0]
  34. jmpl %i7+8,%g0
  35. restore %g0,-1,%o0
  36. 9000:
  37. sub %o1, 1, %o1
  38. retl
  39. and %o0, %o1, %o0
  40. .size __vfork,.-__vfork
  41. weak_alias(__vfork,vfork)
  42. libc_hidden_def(vfork)