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1 /* Copyright (C) 2005, 2008, 2009 Free Software Foundation, Inc.
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2 Contributed by Richard Henderson <rth@redhat.com>.
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3
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4 This file is part of the GNU OpenMP Library (libgomp).
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5
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6 Libgomp is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 3, or (at your option)
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9 any later version.
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10
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11 Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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13 FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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14 more details.
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15
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16 Under Section 7 of GPL version 3, you are granted additional
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17 permissions described in the GCC Runtime Library Exception, version
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18 3.1, as published by the Free Software Foundation.
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19
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20 You should have received a copy of the GNU General Public License and
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21 a copy of the GCC Runtime Library Exception along with this program;
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22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 <http://www.gnu.org/licenses/>. */
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24
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25 /* Provide target-specific access to the futex system call. */
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26
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27 #include <sys/syscall.h>
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28
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29 static inline long
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30 sys_futex0 (int *addr, int op, int val)
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31 {
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32 register long int r0 __asm__ ("r0");
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33 register long int r3 __asm__ ("r3");
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34 register long int r4 __asm__ ("r4");
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35 register long int r5 __asm__ ("r5");
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36 register long int r6 __asm__ ("r6");
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37
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38 r0 = SYS_futex;
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39 r3 = (long) addr;
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40 r4 = op;
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41 r5 = val;
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42 r6 = 0;
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43
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44 /* ??? The powerpc64 sysdep.h file clobbers ctr; the powerpc32 sysdep.h
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45 doesn't. It doesn't much matter for us. In the interest of unity,
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46 go ahead and clobber it always. */
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47
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48 __asm volatile ("sc; mfcr %0"
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49 : "=r"(r0), "=r"(r3), "=r"(r4), "=r"(r5), "=r"(r6)
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50 : "r"(r0), "r"(r3), "r"(r4), "r"(r5), "r"(r6)
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51 : "r7", "r8", "r9", "r10", "r11", "r12",
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52 "cr0", "ctr", "memory");
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53 if (__builtin_expect (r0 & (1 << 28), 0))
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54 return r3;
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55 return 0;
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56 }
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57
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58 static inline void
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59 futex_wait (int *addr, int val)
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60 {
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61 long err = sys_futex0 (addr, gomp_futex_wait, val);
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62 if (__builtin_expect (err == ENOSYS, 0))
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63 {
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64 gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
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65 gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
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66 sys_futex0 (addr, gomp_futex_wait, val);
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67 }
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68 }
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69
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70 static inline void
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71 futex_wake (int *addr, int count)
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72 {
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73 long err = sys_futex0 (addr, gomp_futex_wake, count);
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74 if (__builtin_expect (err == ENOSYS, 0))
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75 {
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76 gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
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77 gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
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78 sys_futex0 (addr, gomp_futex_wake, count);
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79 }
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80 }
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81
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82 static inline void
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83 cpu_relax (void)
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84 {
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85 __asm volatile ("" : : : "memory");
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86 }
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87
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88 static inline void
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89 atomic_write_barrier (void)
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90 {
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91 __asm volatile ("eieio" : : : "memory");
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92 }
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