/* Low-level functions for atomic operations. ARM version. Copyright (C) 1997, 1998, 1999, 2000 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; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #ifndef _ATOMICITY_H #define _ATOMICITY_H 1 #include <inttypes.h> static inline int __attribute_used__ exchange_and_add (volatile uint32_t *mem, int val) { int tmp1; int tmp2; int result; __asm__ ("\n" #if defined(__thumb__) "\t.align 0\n" "\tbx pc\n" "\tnop\n" "\t.arm\n" #endif "0:\tldr\t%0,[%3]\n\t" "add\t%1,%0,%4\n\t" "swp\t%2,%1,[%3]\n\t" "cmp\t%0,%2\n\t" "swpne\t%1,%2,[%3]\n\t" "bne\t0b" #if defined(__thumb__) "\torr %1, pc, #1\n" "\tbx %1\n" "\t.force_thumb" #endif : "=&r" (result), "=&r" (tmp1), "=&r" (tmp2) : "r" (mem), "r"(val) : "cc", "memory"); return result; } static inline void __attribute_used__ atomic_add (volatile uint32_t *mem, int val) { int tmp1; int tmp2; int tmp3; __asm__ ("\n" #if defined(__thumb__) "\t.align 0\n" "\tbx pc\n" "\tnop\n" "\t.arm\n" #endif "0:\tldr\t%0,[%3]\n\t" "add\t%1,%0,%4\n\t" "swp\t%2,%1,[%3]\n\t" "cmp\t%0,%2\n\t" "swpne\t%1,%2,[%3]\n\t" "bne\t0b" #if defined(__thumb__) "\torr %1, pc, #1\n" "\tbx %1\n" "\t.force_thumb" #endif : "=&r" (tmp1), "=&r" (tmp2), "=&r" (tmp3) : "r" (mem), "r"(val) : "cc", "memory"); } static inline int __attribute_used__ compare_and_swap (volatile long int *p, long int oldval, long int newval) { int result, tmp; __asm__ ("\n" #if defined(__thumb__) "\t.align 0\n" "\tbx pc\n" "\tnop\n" "\t.arm\n" #endif "0:\tldr\t%1,[%2]\n\t" "mov\t%0,#0\n\t" "cmp\t%1,%4\n\t" "bne\t1f\n\t" "swp\t%0,%3,[%2]\n\t" "cmp\t%1,%0\n\t" "swpne\t%1,%0,[%2]\n\t" "bne\t0b\n\t" "mov\t%0,#1\n" "1:" #if defined(__thumb__) "\torr %1, pc, #1\n" "\tbx %1\n" "\t.force_thumb" #endif : "=&r" (result), "=&r" (tmp) : "r" (p), "r" (newval), "r" (oldval) : "cc", "memory"); return result; } #endif /* atomicity.h */