vfork.S 1.4 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, write to the Free
  14. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  15. 02111-1307 USA. */
  16. /* Code taken from glibc2.2.2/sysdeps/unix/sysv/linux/sparc/vfork.S */
  17. #include <sys/syscall.h>
  18. #ifndef __NR_vfork
  19. /* uClinux-2.0 only has fork which is really vfork */
  20. #define __NR_vfork __NR_fork
  21. #endif
  22. .text;
  23. .global vfork;
  24. .align 4;
  25. .type vfork,@function;
  26. vfork:
  27. mov __NR_vfork, %g1
  28. ta 0x10
  29. bcc,a 9000f
  30. nop
  31. save %sp,-96,%sp
  32. call __errno_location
  33. nop
  34. st %i0,[%o0]
  35. jmpl %i7+8,%g0
  36. restore %g0,-1,%o0
  37. 9000:
  38. sub %o1, 1, %o1
  39. retl
  40. and %o0, %o1, %o0
  41. .size vfork,.-vfork;