diff options
Diffstat (limited to 'ports/sysdeps/unix/sysv/linux/m68k/coldfire/nptl/bits/atomic.h')
| -rw-r--r-- | ports/sysdeps/unix/sysv/linux/m68k/coldfire/nptl/bits/atomic.h | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/ports/sysdeps/unix/sysv/linux/m68k/coldfire/nptl/bits/atomic.h b/ports/sysdeps/unix/sysv/linux/m68k/coldfire/nptl/bits/atomic.h new file mode 100644 index 0000000000..b088a7247c --- /dev/null +++ b/ports/sysdeps/unix/sysv/linux/m68k/coldfire/nptl/bits/atomic.h @@ -0,0 +1,104 @@ +/* Copyright (C) 2010 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") \ + = 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 |