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/* * sysdeps/microblaze/pt-machine.h -- microblaze-specific pthread definitions * * Copyright (C) 2003 John Williams <jwilliams@itee.uq.edu.au> * Copyright (C) 2002 NEC Electronics Corporation * Copyright (C) 2002 Miles Bader <miles@gnu.org> * * This file is subject to the terms and conditions of the GNU Lesser * General Public License. See the file COPYING.LIB in the main * directory of this archive for more details. * */ #ifndef _PT_MACHINE_H #define _PT_MACHINE_H 1 #include <features.h> #ifndef PT_EI # define PT_EI __extern_always_inline #endif /* 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__ ("r1"); #define HAS_COMPARE_AND_SWAP #define HAS_COMPARE_AND_SWAP_WITH_RELEASE_SEMANTICS #define MEMORY_BARRIER() __asm__ __volatile__("": : :"memory") /* Atomically: If *PTR == OLD, set *PTR to NEW and return true, otherwise do nothing and return false. */ PT_EI int __compare_and_swap (long *ptr, long old, long new) { long prev, cmp, retval; __asm__ __volatile__ (" addi %2, r0, 0;" "1: lwx %0, %3, r0;" " cmp %1, %0, %4;" " bnei %1, 2f;" " swx %5, %3, r0;" " addic %1, r0, 0;" " bnei %1, 1b;" " addi %2, r0, 1;" "2:" : "=&r" (prev), "=&r" (cmp), "=&r" (retval) : "r" (ptr), "r" (old), "r" (new) : "cc", "memory"); return retval; } PT_EI int __compare_and_swap_with_release_semantics (long *p, long oldval, long newval) { MEMORY_BARRIER(); return __compare_and_swap (p, oldval, newval); } /* Spinlock implementation; required. */ PT_EI long int testandset (int *spinlock) { long int retval; __asm__ __volatile__ ("1: lwx %0, %1, r0;" " bnei %0, 2f;" " addik %0, r0, 1;" " swx %0, %1, r0;" " addic %0, r0, 0;" " bnei %0, 1b;" "2:" : "=&r" (retval) : "r" (spinlock) : "cc", "memory"); return retval; } #endif /* pt-machine.h */ |