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      1 /* Copyright (C) 2005-2024 Free Software Foundation, Inc.
      2    Contributed by Jakub Jelinek <jakub (at) 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 }
     96