vfork.S 1.2 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, see
  13. <http://www.gnu.org/licenses/>. */
  14. #include <tcb-offsets.h>
  15. /* Save the PID value. */
  16. #define SAVE_PID \
  17. movl %gs:PID, %edx; \
  18. movl %edx, %eax; \
  19. negl %eax; \
  20. jne 1f; \
  21. movl $0x80000000, %eax; \
  22. 1: movl %eax, %gs:PID
  23. /* Restore the old PID value in the parent. */
  24. #define RESTORE_PID \
  25. testl %eax, %eax; \
  26. je 1f; \
  27. movl %edx, %gs:PID; \
  28. 1:
  29. #include <libc/sysdeps/linux/i386/vfork.S>