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sourceware.org Git - glibc.git/blob - linuxthreads/sysdeps/arm/pt-machine.h
1 /* Machine-dependent pthreads configuration and inline functions.
3 Copyright (C) 1997, 1998 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 Library General Public License as
9 published by the Free Software Foundation; either version 2 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 Library General Public License for more details.
17 You should have received a copy of the GNU Library General Public
18 License along with the GNU C Library; see the file COPYING.LIB. If not,
19 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
23 # define PT_EI extern inline
27 /* This will not work on ARM1 or ARM2 because SWP is lacking on those
28 machines. Unfortunately we have no way to detect this at compile
29 time; let's hope nobody tries to use one. */
31 /* Spinlock implementation; required. */
33 testandset (int *spinlock
)
35 register unsigned int ret
;
37 __asm__
__volatile__("swp %0, %1, [%2]"
39 : "0"(1), "r"(spinlock
));
45 /* Get some notion of the current stack. Need not be exactly the top
46 of the stack, just something somewhere in the current frame. */
47 #define CURRENT_STACK_FRAME stack_pointer
48 register char * stack_pointer
__asm__ ("sp");
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