1 /* Copyright (C) 1991 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If
16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
17 Cambridge, MA 02139, USA. */
20 #include <machine/trap.h>
23 /* Do a "flush register windows trap". The trap handler in the
24 kernel writes all the register windows to their stack slots, and
25 marks them all as invalid (needing to be sucked up from the
26 stack when used). This ensures that all information needed to
27 unwind to these callers is in memory, not in the register
30 ld [%o0], %o7 /* Return PC. */
34 /* if (%o1 == 0) %o1 = 1; */
40 /* On the way out, put the return value in %o0. */