Differential D30900 Diff 92459 sys/amd64/linux/linux_vdso_gtod.c

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sys/amd64/linux/linux_vdso_gtod.c

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				/*-
				* 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 <strings.h>

				#include <machine/atomic.h>
				#include <machine/stdarg.h>

				#include <amd64/linux/linux.h>
				#include <amd64/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;

				#include <x86/linux/linux_vdso_gettc_x86.inc>

				/* for debug purpose */
				static int
				write(int fd, const void *buf, size_t size)
				{
				int res;

				__asm__ __volatile__
				(
				"syscall"
				: "=a"(res)
				: "a"(LINUX_SYS_write), "D"(fd), "S"(buf), "d"(size)
				: "cc", "rcx", "r11", "memory"
				);
				return (res);
				}

				static int
				__vdso_clock_gettime_fallback(clockid_t clock_id, struct l_timespec *ts)
				{
				int res;

				__asm__ __volatile__
				(
				"syscall"
				: "=a"(res)
				: "a"(LINUX_SYS_linux_clock_gettime), "D"(clock_id), "S"(ts)
				: "cc", "rcx", "r11", "memory"
				);
				return (res);
				}

				static int
				__vdso_gettimeofday_fallback(l_timeval tv, struct timezone tz)
				{
				int res;

				__asm__ __volatile__
				(
				"syscall"
				: "=a"(res)
				: "a"(LINUX_SYS_gettimeofday), "D"(tv), "S"(tz)
				: "cc", "rcx", "r11", "memory"
				);
				return (res);
				}

				static int
				__vdso_clock_getres_fallback(clockid_t clock_id, struct l_timespec *ts)
				{
				int res;

				__asm__ __volatile__
				(
				"syscall"
				: "=a"(res)
				: "a"(LINUX_SYS_linux_clock_getres), "D"(clock_id), "S"(ts)
				: "cc", "rcx", "r11", "memory"
				);
				return (res);
				}

				static int
				__vdso_getcpu_fallback(uint32_t cpu, uint32_t node, void *cache)
				{
				int res;

				__asm__ __volatile__
				(
				"syscall"
				: "=a"(res)
				: "a"(LINUX_SYS_linux_getcpu), "D"(cpu), "S"(node), "d"(cache)
				: "cc", "rcx", "r11", "memory"
				);
				return (res);
				}

				static int
				__vdso_time_fallback(long *tm)
				{
				int res;

				__asm__ __volatile__
				(
				"syscall"
				: "=a"(res)
				: "a"(LINUX_SYS_linux_time), "D"(tm)
				: "cc", "rcx", "r11", "memory"
				);
				return (res);
				}

				#include <compat/linux/linux_vdso_gtod.inc>