vfork.S 1.3 KB

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  1. /* Copyright (C) 1999,2002,2004,2006 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 Lesser General Public
  5. License as published by the Free Software Foundation; either
  6. version 2.1 of the 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. Lesser General Public License for more details.
  11. You should have received a copy of the GNU Lesser General Public
  12. License along with the GNU C Library; if not, write to the Free
  13. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  14. 02111-1307 USA. */
  15. #include <tcb-offsets.h>
  16. /* Save the PID value. */
  17. #define SAVE_PID \
  18. movl %gs:PID, %edx; \
  19. movl %edx, %eax; \
  20. negl %eax; \
  21. jne 1f; \
  22. movl $0x80000000, %eax; \
  23. 1: movl %eax, %gs:PID
  24. /* Restore the old PID value in the parent. */
  25. #define RESTORE_PID \
  26. testl %eax, %eax; \
  27. je 1f; \
  28. movl %edx, %gs:PID; \
  29. 1:
  30. #include <libc/sysdeps/linux/i386/vfork.S>