syscall.S 1.3 KB

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  1. /* Copyright (C) 2005, 2007 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. /* The register layout upon entering the function is:
  16. arguments syscall number arg0, arg1, arg2, arg3, arg4, arg5
  17. --------- -------------- ----------------------------------
  18. function a2 a3, a4, a5, a6, a7, (sp)
  19. syscall a2 a6, a3, a4, a5, a8, a9
  20. */
  21. ENTRY (syscall)
  22. l32i a9, a1, 16 /* load extra argument from stack */
  23. mov a8, a7
  24. mov a7, a3 /* preserve a3 in a7 */
  25. mov a3, a4
  26. mov a4, a5
  27. mov a5, a6
  28. mov a6, a7
  29. syscall
  30. movi a4, -4095
  31. bgeu a2, a4, SYSCALL_ERROR_LABEL
  32. .Lpseudo_end:
  33. retw
  34. PSEUDO_END (syscall)