1 /* Machine-dependent pthreads configuration and inline functions.
3 Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public License as
8 published by the Free Software Foundation; either version 2.1 of the
9 License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; see the file COPYING.LIB. If
18 not, see <http://www.gnu.org/licenses/>. */
21 #define _PT_MACHINE_H 1
26 # define PT_EI __extern_always_inline
30 testandset (int *spinlock)
32 register unsigned long int ret;
34 /* Note the use of a dummy output of *spinlock to expose the write. The
35 memory barrier is to stop *other* writes being moved past this code. */
36 __asm__ __volatile__("clearf\n"
43 : "=&r" (ret), "=m" (*spinlock)
44 : "r" (spinlock), "r" ((int) 1)
50 /* Get some notion of the current stack. Need not be exactly the top
51 of the stack, just something somewhere in the current frame.
52 I don't trust register variables, so let's do this the safe way. */
53 #define CURRENT_STACK_FRAME \
54 ({ char *sp; __asm__ ("move.d $sp,%0" : "=rm" (sp)); sp; })
56 #endif /* pt-machine.h */