+++ /dev/null
-// 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 1
-
-typedef 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 */
projects / msp430-gcc.git / blobdiff