/* Machine-dependent pthreads configuration and inline functions. CRIS version. Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; see the file COPYING.LIB. If not, see <http://www.gnu.org/licenses/>. */ #ifndef _PT_MACHINE_H #define _PT_MACHINE_H 1 #include <features.h> #ifndef PT_EI # define PT_EI __extern_always_inline #endif PT_EI long int testandset (int *spinlock) { register unsigned long int ret; /* Note the use of a dummy output of *spinlock to expose the write. The memory barrier is to stop *other* writes being moved past this code. */ __asm__ __volatile__("clearf\n" "0:\n\t" "movu.b [%2],%0\n\t" "ax\n\t" "move.b %3,[%2]\n\t" "bwf 0b\n\t" "clearf" : "=&r" (ret), "=m" (*spinlock) : "r" (spinlock), "r" ((int) 1) : "memory"); return ret; } /* Get some notion of the current stack. Need not be exactly the top of the stack, just something somewhere in the current frame. I don't trust register variables, so let's do this the safe way. */ #define CURRENT_STACK_FRAME \ ({ char *sp; __asm__ ("move.d $sp,%0" : "=rm" (sp)); sp; }) #endif /* pt-machine.h */