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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libgomp/config/linux/powerpc/futex.h | |
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Diffstat (limited to 'libgomp/config/linux/powerpc/futex.h')
-rw-r--r-- | libgomp/config/linux/powerpc/futex.h | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/libgomp/config/linux/powerpc/futex.h b/libgomp/config/linux/powerpc/futex.h new file mode 100644 index 000000000..efc05c416 --- /dev/null +++ b/libgomp/config/linux/powerpc/futex.h @@ -0,0 +1,92 @@ +/* Copyright (C) 2005, 2008, 2009 Free Software Foundation, Inc. + Contributed by Richard Henderson <rth@redhat.com>. + + This file is part of the GNU OpenMP Library (libgomp). + + Libgomp 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 3, or (at your option) + any later version. + + Libgomp 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. + + Under Section 7 of GPL version 3, you are granted additional + permissions described in the GCC Runtime Library Exception, version + 3.1, as published by the Free Software Foundation. + + You should have received a copy of the GNU General Public License and + a copy of the GCC Runtime Library Exception along with this program; + see the files COPYING3 and COPYING.RUNTIME respectively. If not, see + <http://www.gnu.org/licenses/>. */ + +/* Provide target-specific access to the futex system call. */ + +#include <sys/syscall.h> + +static inline long +sys_futex0 (int *addr, int op, int val) +{ + register long int r0 __asm__ ("r0"); + register long int r3 __asm__ ("r3"); + register long int r4 __asm__ ("r4"); + register long int r5 __asm__ ("r5"); + register long int r6 __asm__ ("r6"); + + r0 = SYS_futex; + r3 = (long) addr; + r4 = op; + r5 = val; + r6 = 0; + + /* ??? The powerpc64 sysdep.h file clobbers ctr; the powerpc32 sysdep.h + doesn't. It doesn't much matter for us. In the interest of unity, + go ahead and clobber it always. */ + + __asm volatile ("sc; mfcr %0" + : "=r"(r0), "=r"(r3), "=r"(r4), "=r"(r5), "=r"(r6) + : "r"(r0), "r"(r3), "r"(r4), "r"(r5), "r"(r6) + : "r7", "r8", "r9", "r10", "r11", "r12", + "cr0", "ctr", "memory"); + if (__builtin_expect (r0 & (1 << 28), 0)) + return r3; + return 0; +} + +static inline void +futex_wait (int *addr, int val) +{ + long err = sys_futex0 (addr, gomp_futex_wait, val); + if (__builtin_expect (err == ENOSYS, 0)) + { + gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; + gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; + sys_futex0 (addr, gomp_futex_wait, val); + } +} + +static inline void +futex_wake (int *addr, int count) +{ + long err = sys_futex0 (addr, gomp_futex_wake, count); + if (__builtin_expect (err == ENOSYS, 0)) + { + gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; + gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; + sys_futex0 (addr, gomp_futex_wake, count); + } +} + +static inline void +cpu_relax (void) +{ + __asm volatile ("" : : : "memory"); +} + +static inline void +atomic_write_barrier (void) +{ + __asm volatile ("eieio" : : : "memory"); +} |