1 /* Machine-dependent pthreads configuration and inline functions.
3 Copyright (C) 1997, 1998, 2000, 2002 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5 Contributed by Philip Blundell <philb@gnu.org>.
7 The GNU C Library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public License as
9 published by the Free Software Foundation; either version 2.1 of the
10 License, or (at your option) any later version.
12 The GNU C Library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public
18 License along with the GNU C Library; see the file COPYING.LIB. If
19 not, see <http://www.gnu.org/licenses/>. */
22 #define _PT_MACHINE_H 1
27 # define PT_EI __extern_always_inline
30 /* This will not work on ARM1 or ARM2 because SWP is lacking on those
31 machines. Unfortunately we have no way to detect this at compile
32 time; let's hope nobody tries to use one. */
34 /* Spinlock implementation; required. */
35 PT_EI long int testandset (int *spinlock);
36 PT_EI long int testandset (int *spinlock)
38 register unsigned int ret;
40 #if defined(__thumb__)
47 "\tswp %0, %2, [%3]\n"
52 : "0"(1), "r"(spinlock));
54 __asm__ __volatile__("swp %0, %1, [%2]"
56 : "0"(1), "r"(spinlock));
63 /* Get some notion of the current stack. Need not be exactly the top
64 of the stack, just something somewhere in the current frame. */
65 #define CURRENT_STACK_FRAME stack_pointer
66 register char * stack_pointer __asm__ ("sp");
68 #endif /* pt-machine.h */