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/* * Copyright (C) 2016-2017 Andes Technology, Inc. * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. */ /* Machine-dependent pthreads configuration and inline functions. Copyright (C) 1997, 1998, 2000, 2002, 2003 Free Software Foundation, Inc. Contributed by Philip Blundell <philb@gnu.org>. 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, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifndef _PT_MACHINE_H #define _PT_MACHINE_H 1 #include <features.h> #ifndef PT_EI # define PT_EI __extern_always_inline #endif extern long int testandset (int *spinlock); extern int __compare_and_swap (long int *p, long int oldval, long int newval); /* Spinlock implementation; required. */ PT_EI long int testandset (int *spinlock) { unsigned int val; unsigned int temp; unsigned int offset = 0; __asm__ __volatile__ ( "1:\n\t" "llw %[val], [%[spinlock] + %[offset] << 0]\n\t" "move %[temp], #0x1\n\t" "beq %[val], %[temp], 2f\n\t" "scw %[temp], [%[spinlock] + %[offset] << 0]\n\t" "beqz %[temp], 1b\n\t" "2:\n\t" : [val] "=&r" (val), [temp] "=&r" (temp) : [spinlock] "r" (spinlock), [offset] "r" (offset) : "memory" ) ; return val ; } /* Get some notion of the current stack. Need not be exactly the top of the stack, just something somewhere in the current frame. */ #define CURRENT_STACK_FRAME stack_pointer register char * stack_pointer __asm__ ("$sp"); #endif /* pt-machine.h */ |