pt-vfork.S 1.4 KB

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  1. /* Copyright (C) 2003, 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, see
  13. <http://www.gnu.org/licenses/>. */
  14. #include <sysdep.h>
  15. #include <tcb-offsets.h>
  16. #undef PSEUDO_PREPARE_ARGS
  17. #define PSEUDO_PREPARE_ARGS \
  18. /* Load the current cached pid value across the vfork. */ \
  19. rduniq; \
  20. ldl a2, PID_OFFSET(v0); \
  21. mov v0, a1; \
  22. /* Write back its negation, to indicate that the pid value is \
  23. uninitialized in the the child, and in the window between \
  24. here and the point at which we restore the value. */ \
  25. negl a2, t0; \
  26. stl t0, PID_OFFSET(v0);
  27. PSEUDO (__vfork, vfork, 0)
  28. /* If we're back in the parent, restore the saved pid. */
  29. beq v0, 1f
  30. stl a2, PID_OFFSET(a1)
  31. 1: ret
  32. PSEUDO_END (__vfork)
  33. weak_alias (__vfork, vfork)