vfork.S 1.7 KB

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  1. /* Copyright (C) 2005, 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 <features.h>
  16. #include <tls.h>
  17. /* Save the PID value. */
  18. #define SAVE_PID \
  19. READ_THREAD_POINTER(v1); /* Get the thread pointer. */ \
  20. lw a2, PID_OFFSET(v1); /* Load the saved PID. */ \
  21. subu a2, $0, a2; /* Negate it. */ \
  22. bnez a2, 1f; /* If it was zero... */ \
  23. lui a2, 0x8000; /* use 0x80000000 instead. */ \
  24. 1: sw a2, PID_OFFSET(v1); /* Store the temporary PID. */
  25. /* Restore the old PID value in the parent. */
  26. #define RESTORE_PID \
  27. beqz v0, 1f; /* If we are the parent... */ \
  28. READ_THREAD_POINTER(v1); /* Get the thread pointer. */ \
  29. lw a2, PID_OFFSET(v1); /* Load the saved PID. */ \
  30. subu a2, $0, a2; /* Re-negate it. */ \
  31. lui a0, 0x8000; /* Load 0x80000000... */ \
  32. bne a2, a0, 2f; /* ... compare against it... */ \
  33. li a2, 0; /* ... use 0 instead. */ \
  34. 2: sw a2, PID_OFFSET(v1); /* Restore the PID. */ \
  35. 1:
  36. #include <../../../../../../../libc/sysdeps/linux/mips/vfork.S>