// Low-level functions for atomic operations: ARM version  -*- C++ -*-// Copyright (C) 2000, 2001 Free Software Foundation, Inc.//// This file is part of the GNU ISO C++ Library.  This library is free// software; you can redistribute it and/or modify it under the// terms of the GNU General Public License as published by the// Free Software Foundation; either version 2, or (at your option)// any later version.// This 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 General Public License for more details.// You should have received a copy of the GNU General Public License along// with this library; see the file COPYING.  If not, write to the Free// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,// USA.// As a special exception, you may use this file as part of a free software// library without restriction.  Specifically, if other files instantiate// templates or use macros or inline functions from this file, or you compile// this file and link it with other files to produce an executable, this// file does not by itself cause the resulting executable to be covered by// the GNU General Public License.  This exception does not however// invalidate any other reasons why the executable file might be covered by// the GNU General Public License.#ifndef _BITS_ATOMICITY_H#define _BITS_ATOMICITY_H    1typedef int _Atomic_word;static inline _Atomic_word__attribute__ ((__unused__))__exchange_and_add (volatile _Atomic_word* __mem, int __val){  _Atomic_word __tmp, __tmp2, __result;#ifdef __thumb__  /* Since this function is inlined, we can't be sure of the alignment.  */  __asm__ __volatile__ (	"ldr     %0, 4f \n\t"	"bx      %0 \n\t"	".align 0 \n"	"4:\t"	".word   0f \n\t"	".code 32 \n"	"0:\t"	"ldr     %0, [%3] \n\t"	"add     %1, %0, %4 \n\t"	"swp     %2, %1, [%3] \n\t"        "cmp     %0, %2 \n\t"        "swpne   %1, %2, [%3] \n\t"        "bne     0b \n\t"	"ldr     %1, 1f \n\t"	"bx      %1 \n"	"1:\t"	".word   2f \n\t"	".code 16 \n"	"2:\n"	: "=&l"(__result), "=&r"(__tmp), "=&r"(__tmp2) 	: "r" (__mem), "r"(__val) 	: "cc", "memory");#else  __asm__ __volatile__ (	"\n"	"0:\t"	"ldr     %0, [%3] \n\t"	"add     %1, %0, %4 \n\t"	"swp     %2, %1, [%3] \n\t"	"cmp     %0, %2 \n\t"	"swpne   %1, %2, [%3] \n\t"	"bne     0b \n\t"	""	: "=&r"(__result), "=&r"(__tmp), "=&r"(__tmp2) 	: "r" (__mem), "r"(__val) 	: "cc", "memory");#endif  return __result;}static inline void__attribute__ ((__unused__))__atomic_add (volatile _Atomic_word *__mem, int __val){  _Atomic_word __tmp, __tmp2, __tmp3;#ifdef __thumb__  /* Since this function is inlined, we can't be sure of the alignment.  */  __asm__ __volatile__ (	"ldr     %0, 4f \n\t"	"bx      %0 \n\t"	".align 0\n"	"4:\t"	".word   0f \n\t"	".code 32 \n"	"0:\t"	"ldr     %0, [%3] \n\t"	"add     %1, %0, %4 \n\t"        "swp     %2, %1, [%3] \n\t"        "cmp     %0, %2 \n\t"        "swpne   %1, %2,[%3] \n\t"        "bne     0b \n\t"	"ldr     %1, 1f \n\t"	"bx      %1 \n"	"1:\t"	".word   2f \n\t"	".code 16 \n"	"2:\n"	: "=&l"(__tmp), "=&r"(__tmp2), "=&r"(__tmp3) 	: "r" (__mem), "r"(__val) 	: "cc", "memory");#else  __asm__ __volatile__ (	"\n"	"0:\t"	"ldr     %0, [%3] \n\t"	"add     %1, %0, %4 \n\t"	"swp     %2, %1, [%3] \n\t"	"cmp     %0, %2 \n\t"	"swpne   %1, %2, [%3] \n\t"	"bne     0b \n\t"	""	: "=&r"(__tmp), "=&r"(__tmp2), "=&r"(__tmp3) 	: "r" (__mem), "r"(__val) 	: "cc", "memory");#endif}static inline long__attribute__ ((__unused__))__always_swap (volatile long *__p, long __newval){  long __result;#ifdef __thumb__  long __tmp;  /* Since this function is inlined, we can't be sure of the alignment.  */  __asm__ __volatile__ (	"ldr     %0, 4f \n\t"	"bx      %0 \n\t"	".align 0 \n"	"4:\t"	".word   0f \n\t"	".code 32\n"	"0:\t"	"swp     %0, %3, [%2] \n\t"	"ldr     %1, 1f \n\t"	"bx      %1 \n"	"1:\t"	".word   2f \n\t"	".code 16 \n"	"2:\n"	: "=&l"(__result), "=&r"(__tmp)	: "r"(__p), "r"(__newval)	: "memory");#else  __asm__ __volatile__ (	"\n\t"	"swp     %0, %2, [%1] \n\t"	""	: "=&r"(__result)	: "r"(__p), "r"(__newval)	: "memory");#endif  return __result;}static inline int__attribute__ ((__unused__))__test_and_set (volatile long *__p, long __newval){  int __result;  long __tmp;#ifdef __thumb__  /* Since this function is inlined, we can't be sure of the alignment.  */  __asm__ __volatile__ (	"ldr     %0, 4f \n\t"	"bx      %0 \n\t"	".align 0 \n"	"4:\t"	".word   0f \n\t"	".code 32 \n"	"0:\t"	"ldr     %0, [%2] \n\t"        "cmp     %0, #0 \n\t"        "bne     1f \n\t"        "swp     %1, %3, [%2] \n\t"        "cmp     %0, %1 \n\t"        "swpne   %0, %1, [%2]\n\t"        "bne     0b \n"	"1:\t"	"ldr     %1, 2f \n\t"	"bx      %1 \n"	"2:\t"	".word   3f \n\t"	".code 16 \n"	"3:"	: "=&l"(__result), "=r" (__tmp) 	: "r"(__p), "r"(__newval) 	: "cc", "memory");#else  __asm__ __volatile__ (	"\n"	"0:\t"	"ldr     %0, [%2] \n\t"	"cmp     %0, #0 \n\t"	"bne     1f \n\t"	"swp     %1, %3, [%2] \n\t"	"cmp     %0, %1 \n\t"	"swpne   %0, %1, [%2] \n\t"	"bne     0b \n"	"1:\n\t"	""	: "=&r"(__result), "=r" (__tmp) 	: "r"(__p), "r"(__newval) 	: "cc", "memory");#endif  return __result;}#endif /* atomicity.h */