vfork.S 1.4 KB

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  1. /* Copyright (C) 2004 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. /* We want an #include_next, but we are the main source file.
  16. So, #include ourselves and in that incarnation we can use #include_next. */
  17. #ifndef INCLUDED_SELF
  18. # define INCLUDED_SELF
  19. # include <vfork.S>
  20. #else
  21. # include <tcb-offsets.h>
  22. # define SAVE_PID \
  23. movl %fs:PID, %esi; \
  24. movl $0x80000000, %ecx; \
  25. movl %esi, %edx; \
  26. negl %edx; \
  27. cmove %ecx, %edx; \
  28. movl %edx, %fs:PID
  29. # define RESTORE_PID \
  30. testq %rax, %rax; \
  31. je 1f; \
  32. movl %esi, %fs:PID; \
  33. 1:
  34. # include_next <vfork.S>
  35. #endif