1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2021 Dmitry Chagin <dchagin@FreeBSD.org> 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/elf.h> 32 #include <sys/errno.h> 33 #include <sys/proc.h> 34 #include <sys/stddef.h> 35 #define _KERNEL 36 #include <sys/vdso.h> 37 #undef _KERNEL 38 #include <stdbool.h> 39 40 #include <machine/atomic.h> 41 #include <machine/cpufunc.h> 42 #include <machine/stdarg.h> 43 44 #include <amd64/linux/linux.h> 45 #include <amd64/linux/linux_syscall.h> 46 #include <compat/linux/linux_errno.h> 47 #include <compat/linux/linux_timer.h> 48 49 /* The kernel fixup this at vDSO install */ 50 uintptr_t *kern_timekeep_base = NULL; 51 uint32_t kern_tsc_selector = 0; 52 uint32_t kern_cpu_selector = 0; 53 54 #include <x86/linux/linux_vdso_gettc_x86.inc> 55 #include <x86/linux/linux_vdso_getcpu_x86.inc> 56 57 /* for debug purpose */ 58 static int 59 write(int fd, const void *buf, size_t size) 60 { 61 int res; 62 63 __asm__ __volatile__ 64 ( 65 "syscall" 66 : "=a"(res) 67 : "a"(LINUX_SYS_write), "D"(fd), "S"(buf), "d"(size) 68 : "cc", "rcx", "r11", "memory" 69 ); 70 return (res); 71 } 72 73 static int 74 __vdso_clock_gettime_fallback(clockid_t clock_id, struct l_timespec *ts) 75 { 76 int res; 77 78 __asm__ __volatile__ 79 ( 80 "syscall" 81 : "=a"(res) 82 : "a"(LINUX_SYS_linux_clock_gettime), "D"(clock_id), "S"(ts) 83 : "cc", "rcx", "r11", "memory" 84 ); 85 return (res); 86 } 87 88 static int 89 __vdso_gettimeofday_fallback(l_timeval *tv, struct timezone *tz) 90 { 91 int res; 92 93 __asm__ __volatile__ 94 ( 95 "syscall" 96 : "=a"(res) 97 : "a"(LINUX_SYS_gettimeofday), "D"(tv), "S"(tz) 98 : "cc", "rcx", "r11", "memory" 99 ); 100 return (res); 101 } 102 103 static int 104 __vdso_clock_getres_fallback(clockid_t clock_id, struct l_timespec *ts) 105 { 106 int res; 107 108 __asm__ __volatile__ 109 ( 110 "syscall" 111 : "=a"(res) 112 : "a"(LINUX_SYS_linux_clock_getres), "D"(clock_id), "S"(ts) 113 : "cc", "rcx", "r11", "memory" 114 ); 115 return (res); 116 } 117 118 static int 119 __vdso_getcpu_fallback(uint32_t *cpu, uint32_t *node, void *cache) 120 { 121 int res; 122 123 __asm__ __volatile__ 124 ( 125 "syscall" 126 : "=a"(res) 127 : "a"(LINUX_SYS_linux_getcpu), "D"(cpu), "S"(node), "d"(cache) 128 : "cc", "rcx", "r11", "memory" 129 ); 130 return (res); 131 } 132 133 static int 134 __vdso_time_fallback(long *tm) 135 { 136 int res; 137 138 __asm__ __volatile__ 139 ( 140 "syscall" 141 : "=a"(res) 142 : "a"(LINUX_SYS_linux_time), "D"(tm) 143 : "cc", "rcx", "r11", "memory" 144 ); 145 return (res); 146 } 147 148 #include <compat/linux/linux_vdso_gtod.inc> 149