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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 #ifndef SYS_futex
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28 #define SYS_futex 394
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29 #endif
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30
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31
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32 static inline void
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33 futex_wait (int *addr, int val)
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34 {
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35 register long sc_0 __asm__("$0");
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36 register long sc_16 __asm__("$16");
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37 register long sc_17 __asm__("$17");
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38 register long sc_18 __asm__("$18");
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39 register long sc_19 __asm__("$19");
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40
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41 sc_0 = SYS_futex;
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42 sc_16 = (long) addr;
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43 sc_17 = gomp_futex_wait;
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44 sc_18 = val;
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45 sc_19 = 0;
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46 __asm volatile ("callsys"
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47 : "=r" (sc_0), "=r"(sc_19)
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48 : "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18), "1"(sc_19)
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49 : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8",
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50 "$22", "$23", "$24", "$25", "$27", "$28", "memory");
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51 if (__builtin_expect (sc_19, 0) && sc_0 == ENOSYS)
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52 {
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53 gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
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54 gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
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55 sc_0 = SYS_futex;
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56 sc_17 &= ~FUTEX_PRIVATE_FLAG;
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57 sc_19 = 0;
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58 __asm volatile ("callsys"
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59 : "=r" (sc_0), "=r"(sc_19)
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60 : "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18),
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61 "1"(sc_19)
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62 : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8",
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63 "$22", "$23", "$24", "$25", "$27", "$28", "memory");
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64 }
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65 }
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66
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67 static inline void
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68 futex_wake (int *addr, int count)
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69 {
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70 register long sc_0 __asm__("$0");
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71 register long sc_16 __asm__("$16");
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72 register long sc_17 __asm__("$17");
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73 register long sc_18 __asm__("$18");
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74 register long sc_19 __asm__("$19");
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75
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76 sc_0 = SYS_futex;
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77 sc_16 = (long) addr;
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78 sc_17 = gomp_futex_wake;
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79 sc_18 = count;
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80 __asm volatile ("callsys"
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81 : "=r" (sc_0), "=r"(sc_19)
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82 : "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18)
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83 : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8",
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84 "$22", "$23", "$24", "$25", "$27", "$28", "memory");
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85 if (__builtin_expect (sc_19, 0) && sc_0 == ENOSYS)
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86 {
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87 gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
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88 gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
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89 sc_0 = SYS_futex;
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90 sc_17 &= ~FUTEX_PRIVATE_FLAG;
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91 __asm volatile ("callsys"
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92 : "=r" (sc_0), "=r"(sc_19)
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93 : "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18)
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94 : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8",
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95 "$22", "$23", "$24", "$25", "$27", "$28", "memory");
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96 }
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97 }
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98
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99 static inline void
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100 cpu_relax (void)
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101 {
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102 __asm volatile ("" : : : "memory");
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103 }
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104
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105 static inline void
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106 atomic_write_barrier (void)
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107 {
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108 __asm volatile ("wmb" : : : "memory");
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109 }
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