vfork.S 1.8 KB

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  1. /* Copyright (C) 2000, 2002, 2003 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 <sysdep-cancel.h>
  16. #define _SIGNAL_H
  17. #include <bits/signum.h>
  18. /* The following are defined in linux/sched.h, which unfortunately */
  19. /* is not safe for inclusion in an assembly file. */
  20. #define CLONE_VM 0x00000100 /* set if VM shared between processes */
  21. #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
  22. /* pid_t vfork(void); */
  23. /* Implemented as __clone_syscall(CLONE_VFORK | CLONE_VM | SIGCHLD, 0) */
  24. ENTRY(__vfork)
  25. #ifdef SHARED
  26. addl r14 = @gprel(__libc_pthread_functions#), gp;;
  27. #else
  28. .weak pthread_create
  29. addl r14 = @ltoff(@fptr(pthread_create#)), gp;;
  30. #endif
  31. ld8 r14 = [r14];;
  32. cmp.ne p6, p7 = 0, r14
  33. (p6) br.cond.spnt.few HIDDEN_JUMPTARGET (__fork);;
  34. alloc r2=ar.pfs,0,0,2,0
  35. mov out0=CLONE_VM+CLONE_VFORK+SIGCHLD
  36. mov out1=0 /* Standard sp value. */
  37. ;;
  38. DO_CALL (SYS_ify (clone))
  39. cmp.eq p6,p0=-1,r10
  40. ;;
  41. (p6) br.cond.spnt.few __syscall_error
  42. ret
  43. PSEUDO_END(__vfork)
  44. libc_hidden_def (__vfork)
  45. weak_alias (__vfork, vfork)