FreeBSD/Linux Kernel Cross Reference
sys/i386/linux/linux_vdso_gtod.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2021 Dmitry Chagin <dchagin@FreeBSD.org>
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/elf.h>
    #include <sys/errno.h>
    #include <sys/proc.h>
    #include <sys/stddef.h>
    #define _KERNEL
    #include <sys/vdso.h>
    #undef  _KERNEL
    #include <stdbool.h>
    
    #include <machine/atomic.h>
    #include <machine/cpufunc.h>
    #include <machine/stdarg.h>
    
    #include <i386/linux/linux.h>
    #include <i386/linux/linux_syscall.h>
    #include <compat/linux/linux_errno.h>
    #include <compat/linux/linux_timer.h>
    
    /* The kernel fixup this at vDSO install */
    uintptr_t *kern_timekeep_base = NULL;
    uint32_t kern_tsc_selector = 0;
    uint32_t kern_cpu_selector = 0;
    
    #include <x86/linux/linux_vdso_gettc_x86.inc>
    #include <x86/linux/linux_vdso_getcpu_x86.inc>
    
    static int
    write(int fd, const void *buf, size_t size)
    {
            int res;
    
            __asm__ __volatile__
            (
                "int $0x80"
                : "=a"(res)
                : "a"(LINUX_SYS_write), "b"(fd), "c"(buf), "d"(size)
                : "cc", "memory"
            );
            return (res);
    }
    
    static int
    __vdso_clock_gettime_fallback(clockid_t clock_id, struct l_timespec *ts)
    {
            int res;
    
            __asm__ __volatile__
            (
                "int $0x80"
                : "=a"(res)
                : "a"(LINUX_SYS_linux_clock_gettime), "b"(clock_id), "c"(ts)
                : "cc", "memory"
            );
            return (res);
    }
    
    static int
    __vdso_clock_gettime64_fallback(clockid_t clock_id, struct l_timespec64 *ts)
    {
            int res;
    
            __asm__ __volatile__
            (
                "int $0x80"
                : "=a"(res)
                : "a"(LINUX_SYS_linux_clock_gettime64), "b"(clock_id), "c"(ts)
                : "cc", "memory"
            );
            return (res);
   }
   
   static int
   __vdso_gettimeofday_fallback(l_timeval *tv, struct timezone *tz)
   {
           int res;
   
           __asm__ __volatile__
           (
               "int $0x80"
               : "=a"(res)
               : "a"(LINUX_SYS_gettimeofday), "b"(tv), "c"(tz)
               : "cc", "memory"
           );
           return (res);
   }
   
   static int
   __vdso_clock_getres_fallback(clockid_t clock_id, struct l_timespec *ts)
   {
           int res;
   
           __asm__ __volatile__
           (
               "int $0x80"
               : "=a"(res)
               : "a"(LINUX_SYS_linux_clock_getres), "b"(clock_id), "c"(ts)
               : "cc", "memory"
           );
           return (res);
   }
   
   static int
   __vdso_getcpu_fallback(uint32_t *cpu, uint32_t *node, void *cache)
   {
           int res;
   
           __asm__ __volatile__
           (
               "int $0x80"
               : "=a"(res)
               : "a"(LINUX_SYS_linux_getcpu), "D"(cpu), "S"(node), "d"(cache)
               : "cc", "memory"
           );
           return (res);
   }
   
   static int
   __vdso_time_fallback(long *tm)
   {
           int res;
   
           __asm__ __volatile__
           (
               "int $0x80"
               : "=a"(res)
               : "a"(LINUX_SYS_linux_time), "b"(tm)
               : "cc", "memory"
           );
           return (res);
   }
   
   #include <compat/linux/linux_vdso_gtod.inc>

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