| /* Copyright (C) 2010-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Maxim Kuvyrkov <maxim@codesourcery.com>, 2010. |
| |
| 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, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef _BITS_ATOMIC_H |
| #define _BITS_ATOMIC_H 1 |
| |
| #include <stdint.h> |
| #include <sysdep.h> |
| #include <bits/m68k-vdso.h> |
| |
| /* Coldfire has no atomic compare-and-exchange operation, but the |
| kernel provides userspace atomicity operations. Use them. */ |
| |
| typedef int32_t atomic32_t; |
| typedef uint32_t uatomic32_t; |
| typedef int_fast32_t atomic_fast32_t; |
| typedef uint_fast32_t uatomic_fast32_t; |
| |
| typedef intptr_t atomicptr_t; |
| typedef uintptr_t uatomicptr_t; |
| typedef intmax_t atomic_max_t; |
| typedef uintmax_t uatomic_max_t; |
| |
| /* The only basic operation needed is compare and exchange. */ |
| /* For ColdFire we'll have to trap into the kernel mode anyway, |
| so trap from the library rather then from the kernel wrapper. */ |
| #ifdef SHARED |
| # define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \ |
| ({ \ |
| /* Use temporary variables to workaround call-clobberness of \ |
| the registers. */ \ |
| __typeof (mem) _mem = mem; \ |
| __typeof (oldval) _oldval = oldval; \ |
| __typeof (newval) _newval = newval; \ |
| register __typeof (mem) _a0 asm ("a0") = _mem; \ |
| register __typeof (oldval) _d0 asm ("d0") = _oldval; \ |
| register __typeof (newval) _d1 asm ("d1") = _newval; \ |
| void *tmp; \ |
| \ |
| asm ("movel #_GLOBAL_OFFSET_TABLE_@GOTPC, %2\n\t" \ |
| "lea (-6, %%pc, %2), %2\n\t" \ |
| "movel " STR_M68K_VDSO_SYMBOL (__vdso_atomic_cmpxchg_32) \ |
| "@GOT(%2), %2\n\t" \ |
| "movel (%2), %2\n\t" \ |
| "jsr (%2)\n\t" \ |
| : "+d" (_d0), "+m" (*_a0), "=&a" (tmp) \ |
| : "a" (_a0), "d" (_d1)); \ |
| _d0; \ |
| }) |
| #else |
| # define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \ |
| ({ \ |
| /* Use temporary variables to workaround call-clobberness of \ |
| the registers. */ \ |
| __typeof (mem) _mem = mem; \ |
| __typeof (oldval) _oldval = oldval; \ |
| __typeof (newval) _newval = newval; \ |
| register __typeof (oldval) _d0 asm ("d0") \ |
| = (__typeof (oldval)) SYS_ify (atomic_cmpxchg_32); \ |
| register __typeof (mem) _a0 asm ("a0") = _mem; \ |
| register __typeof (oldval) _d2 asm ("d2") = _oldval; \ |
| register __typeof (newval) _d1 asm ("d1") = _newval; \ |
| \ |
| asm ("trap #0" \ |
| : "+d" (_d0), "+m" (*_a0) \ |
| : "a" (_a0), "d" (_d2), "d" (_d1)); \ |
| _d0; \ |
| }) |
| #endif |
| |
| #ifdef SHARED |
| # define atomic_full_barrier() \ |
| ({ \ |
| void *tmp; \ |
| \ |
| asm ("movel #_GLOBAL_OFFSET_TABLE_@GOTPC, %0\n\t" \ |
| "lea (-6, %pc, %0), %0\n\t" \ |
| "movel " STR_M68K_VDSO_SYMBOL (__vdso_atomic_barrier) \ |
| "@GOT(%0), %0\n\t" \ |
| "movel (%0), %0\n\t" \ |
| "jsr (%0)\n\t" \ |
| : "=&a" (tmp)); \ |
| }) |
| #else |
| # define atomic_full_barrier() \ |
| (INTERNAL_SYSCALL (atomic_barrier, , 0), (void) 0) |
| #endif |
| |
| #endif |
