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| 1 | /* Copyright (C) 2010-2024 Free Software Foundation, Inc. |
|---|---|
| 2 | This file is part of the GNU C Library. |
| 3 | |
| 4 | The GNU C Library is free software; you can redistribute it and/or |
| 5 | modify it under the terms of the GNU Lesser General Public |
| 6 | License as published by the Free Software Foundation; either |
| 7 | version 2.1 of the License, or (at your option) any later version. |
| 8 | |
| 9 | The GNU C Library is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | Lesser General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU Lesser General Public |
| 15 | License along with the GNU C Library. If not, see |
| 16 | <https://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | #ifndef _ATOMIC_MACHINE_H |
| 19 | #define _ATOMIC_MACHINE_H 1 |
| 20 | |
| 21 | #include <sysdep.h> |
| 22 | |
| 23 | /* Coldfire has no atomic compare-and-exchange operation, but the |
| 24 | kernel provides userspace atomicity operations. Use them. */ |
| 25 | |
| 26 | #define __HAVE_64B_ATOMICS 0 |
| 27 | #define USE_ATOMIC_COMPILER_BUILTINS 0 |
| 28 | |
| 29 | /* XXX Is this actually correct? */ |
| 30 | #define ATOMIC_EXCHANGE_USES_CAS 1 |
| 31 | |
| 32 | /* The only basic operation needed is compare and exchange. */ |
| 33 | #define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \ |
| 34 | ({ \ |
| 35 | /* Use temporary variables to workaround call-clobberness of \ |
| 36 | the registers. */ \ |
| 37 | __typeof (mem) _mem = mem; \ |
| 38 | __typeof (oldval) _oldval = oldval; \ |
| 39 | __typeof (newval) _newval = newval; \ |
| 40 | register uint32_t _d0 asm ("d0") = SYS_ify (atomic_cmpxchg_32); \ |
| 41 | register uint32_t *_a0 asm ("a0") = (uint32_t *) _mem; \ |
| 42 | register uint32_t _d2 asm ("d2") = (uint32_t) _oldval; \ |
| 43 | register uint32_t _d1 asm ("d1") = (uint32_t) _newval; \ |
| 44 | \ |
| 45 | asm ("trap #0" \ |
| 46 | : "+d" (_d0), "+m" (*_a0) \ |
| 47 | : "a" (_a0), "d" (_d2), "d" (_d1)); \ |
| 48 | (__typeof (oldval)) _d0; \ |
| 49 | }) |
| 50 | |
| 51 | # define atomic_full_barrier() \ |
| 52 | (INTERNAL_SYSCALL_CALL (atomic_barrier), (void) 0) |
| 53 | |
| 54 | #endif |
| 55 |
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