sysdeps/alpha/bsd-_setjmp.S

   1 /* BSD `_setjmp' entry point to `sigsetjmp (..., 0)'.  Alpha version.
   2 Copyright (C) 1994 Free Software Foundation, Inc.
   3 This file is part of the GNU C Library.
   4
   5 The GNU C Library is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU Library General Public License as
   7 published by the Free Software Foundation; either version 2 of the
   8 License, or (at your option) any later version.
   9
  10 The GNU C Library is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with the GNU C Library; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, USA.  */
  19
  20 /* This just does a tail-call to `__sigsetjmp (ARG, 0)'.
  21    We cannot do it in C because it must be a tail-call, so frame-unwinding
  22    in setjmp doesn't clobber the state restored by longjmp.  */
  23
  24 #include <sysdep.h>
  25
  26 ENTRY (setjmp)
  27         lda $27, __sigsetjmp    /* Load address to jump to.  */
  28         bis $31, $31, $17       /* Pass a second argument of zero.  */
  29         jmp $31, ($27), __sigsetjmp /* Call __sigsetjmp.  */
  30         .end setjmp