1 /* Copyright (C) 2010-2014 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Maxim Kuvyrkov <maxim@codesourcery.com>, 2010.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library. If not, see
17 <http://www.gnu.org/licenses/>. */
19 #ifndef _BITS_ATOMIC_H
20 #define _BITS_ATOMIC_H 1
24 #include <bits/m68k-vdso.h>
26 /* Coldfire has no atomic compare-and-exchange operation, but the
27 kernel provides userspace atomicity operations. Use them. */
29 typedef int32_t atomic32_t;
30 typedef uint32_t uatomic32_t;
31 typedef int_fast32_t atomic_fast32_t;
32 typedef uint_fast32_t uatomic_fast32_t;
34 typedef intptr_t atomicptr_t;
35 typedef uintptr_t uatomicptr_t;
36 typedef intmax_t atomic_max_t;
37 typedef uintmax_t uatomic_max_t;
39 #define __HAVE_64B_ATOMICS 0
40 #define USE_ATOMIC_COMPILER_BUILTINS 0
42 /* The only basic operation needed is compare and exchange. */
43 /* For ColdFire we'll have to trap into the kernel mode anyway,
44 so trap from the library rather then from the kernel wrapper. */
46 # define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
48 /* Use temporary variables to workaround call-clobberness of \
50 __typeof (mem) _mem = mem; \
51 __typeof (oldval) _oldval = oldval; \
52 __typeof (newval) _newval = newval; \
53 register __typeof (mem) _a0 asm ("a0") = _mem; \
54 register __typeof (oldval) _d0 asm ("d0") = _oldval; \
55 register __typeof (newval) _d1 asm ("d1") = _newval; \
58 asm ("movel #_GLOBAL_OFFSET_TABLE_@GOTPC, %2\n\t" \
59 "lea (-6, %%pc, %2), %2\n\t" \
60 "movel " STR_M68K_VDSO_SYMBOL (__vdso_atomic_cmpxchg_32) \
62 "movel (%2), %2\n\t" \
64 : "+d" (_d0), "+m" (*_a0), "=&a" (tmp) \
65 : "a" (_a0), "d" (_d1)); \
69 # define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
71 /* Use temporary variables to workaround call-clobberness of \
73 __typeof (mem) _mem = mem; \
74 __typeof (oldval) _oldval = oldval; \
75 __typeof (newval) _newval = newval; \
76 register __typeof (oldval) _d0 asm ("d0") \
77 = (__typeof (oldval)) SYS_ify (atomic_cmpxchg_32); \
78 register __typeof (mem) _a0 asm ("a0") = _mem; \
79 register __typeof (oldval) _d2 asm ("d2") = _oldval; \
80 register __typeof (newval) _d1 asm ("d1") = _newval; \
83 : "+d" (_d0), "+m" (*_a0) \
84 : "a" (_a0), "d" (_d2), "d" (_d1)); \
90 # define atomic_full_barrier() \
94 asm ("movel #_GLOBAL_OFFSET_TABLE_@GOTPC, %0\n\t" \
95 "lea (-6, %pc, %0), %0\n\t" \
96 "movel " STR_M68K_VDSO_SYMBOL (__vdso_atomic_barrier) \
98 "movel (%0), %0\n\t" \
103 # define atomic_full_barrier() \
104 (INTERNAL_SYSCALL (atomic_barrier, , 0), (void) 0)