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/* * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com) * * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball. */ #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); PT_EI long int testandset (int *spinlock) { unsigned int old = 1; /* Atomically exchange @spinlock with 1 */ __asm__ __volatile__( "ex %0, [%1]" : "+r" (old) : "r" (spinlock) : "memory"); return old; } /* 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 \ __extension__ ({ char *__sp; __asm__ ("mov %0,sp" : "=r" (__sp)); __sp; }) #else #error PT_MACHINE already defined #endif /* pt-machine.h */ |