libgomp/config/linux/sparc/futex.h

   1 /* Copyright (C) 2005-2024 Free Software Foundation, Inc.
   2    Contributed by Jakub Jelinek <jakub@redhat.com>.
   3
   4    This file is part of the GNU Offloading and Multi Processing Library
   5    (libgomp).
   6
   7    Libgomp is free software; you can redistribute it and/or modify it
   8    under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3, or (at your option)
  10    any later version.
  11
  12    Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
  13    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  14    FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15    more details.
  16
  17    Under Section 7 of GPL version 3, you are granted additional
  18    permissions described in the GCC Runtime Library Exception, version
  19    3.1, as published by the Free Software Foundation.
  20
  21    You should have received a copy of the GNU General Public License and
  22    a copy of the GCC Runtime Library Exception along with this program;
  23    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24    <http://www.gnu.org/licenses/>.  */
  25
  26 /* Provide target-specific access to the futex system call.  */
  27
  28 #include <sys/syscall.h>
  29
  30 static inline long
  31 sys_futex0 (int *addr, int op, int val)
  32 {
  33   register long int g1  __asm__ ("g1");
  34   register long int o0  __asm__ ("o0");
  35   register long int o1  __asm__ ("o1");
  36   register long int o2  __asm__ ("o2");
  37   register long int o3  __asm__ ("o3");
  38
  39   g1 = SYS_futex;
  40   o0 = (long) addr;
  41   o1 = op;
  42   o2 = val;
  43   o3 = 0;
  44
  45 #ifdef __arch64__
  46 # define SYSCALL_STRING "ta\t0x6d; bcs,a,pt %%xcc, 1f; sub %%g0, %%o0, %%o0; 1:"
  47 #else
  48 # define SYSCALL_STRING "ta\t0x10; bcs,a 1f; sub %%g0, %%o0, %%o0; 1:"
  49 #endif
  50
  51   __asm volatile (SYSCALL_STRING
  52                   : "=r" (g1), "=r" (o0)
  53                   : "0" (g1), "1" (o0), "r" (o1), "r" (o2), "r" (o3)
  54                   : "g2", "g3", "g4", "g5", "g6",
  55                     "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
  56                     "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",
  57                     "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",
  58                     "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",
  59 #ifdef __arch64__
  60                     "f32", "f34", "f36", "f38", "f40", "f42", "f44", "f46",
  61                     "f48", "f50", "f52", "f54", "f56", "f58", "f60", "f62",
  62 #endif
  63                     "cc", "memory");
  64   return o0;
  65 }
  66
  67 static inline void
  68 futex_wait (int *addr, int val)
  69 {
  70   long err = sys_futex0 (addr, gomp_futex_wait, val);
  71   if (__builtin_expect (err == ENOSYS, 0))
  72     {
  73       gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
  74       gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
  75       sys_futex0 (addr, gomp_futex_wait, val);
  76     }
  77 }
  78
  79 static inline void
  80 futex_wake (int *addr, int count)
  81 {
  82   long err = sys_futex0 (addr, gomp_futex_wake, count);
  83   if (__builtin_expect (err == ENOSYS, 0))
  84     {
  85       gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
  86       gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
  87       sys_futex0 (addr, gomp_futex_wake, count);
  88     }
  89 }
  90
  91 static inline void
  92 cpu_relax (void)
  93 {
  94   __asm volatile ("rd %%ccr, %%g0" : : : "memory");
  95 }