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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
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30
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31 static inline long
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32 sys_futex0(int *addr, long op, int val)
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33 {
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34 register long out0 asm ("out0") = (long) addr;
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35 register long out1 asm ("out1") = op;
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36 register long out2 asm ("out2") = val;
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37 register long out3 asm ("out3") = 0;
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38 register long r8 asm ("r8");
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39 register long r10 asm ("r10");
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40 register long r15 asm ("r15") = SYS_futex;
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41
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42 __asm __volatile ("break 0x100000"
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43 : "=r"(r15), "=r"(out0), "=r"(out1), "=r"(out2), "=r"(out3),
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44 "=r"(r8), "=r"(r10)
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45 : "r"(r15), "r"(out0), "r"(out1), "r"(out2), "r"(out3)
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46 : "memory", "out4", "out5", "out6", "out7",
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47 /* Non-stacked integer registers, minus r8, r10, r15. */
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48 "r2", "r3", "r9", "r11", "r12", "r13", "r14", "r16", "r17", "r18",
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49 "r19", "r20", "r21", "r22", "r23", "r24", "r25", "r26", "r27",
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50 "r28", "r29", "r30", "r31",
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51 /* Predicate registers. */
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52 "p6", "p7", "p8", "p9", "p10", "p11", "p12", "p13", "p14", "p15",
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53 /* Non-rotating fp registers. */
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54 "f6", "f7", "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",
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55 /* Branch registers. */
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56 "b6");
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57 return r8 & r10;
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58 }
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59
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60 static inline void
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61 futex_wait (int *addr, int val)
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62 {
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63 long err = sys_futex0 (addr, gomp_futex_wait, val);
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64 if (__builtin_expect (err == ENOSYS, 0))
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65 {
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66 gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
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67 gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
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68 sys_futex0 (addr, gomp_futex_wait, val);
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69 }
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70 }
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71
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72 static inline void
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73 futex_wake (int *addr, int count)
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74 {
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75 long err = sys_futex0 (addr, gomp_futex_wake, count);
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76 if (__builtin_expect (err == ENOSYS, 0))
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77 {
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78 gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
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79 gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
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80 sys_futex0 (addr, gomp_futex_wake, count);
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81 }
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82 }
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83
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84 static inline void
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85 cpu_relax (void)
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86 {
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87 __asm volatile ("hint @pause" : : : "memory");
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88 }
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89
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90 static inline void
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91 atomic_write_barrier (void)
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92 {
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93 __sync_synchronize ();
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94 }
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