diff options
Diffstat (limited to 'sys/amd64/linux/linux_vdso_gtod.c')
| -rw-r--r-- | sys/amd64/linux/linux_vdso_gtod.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/sys/amd64/linux/linux_vdso_gtod.c b/sys/amd64/linux/linux_vdso_gtod.c new file mode 100644 index 000000000000..abe42d51a3ac --- /dev/null +++ b/sys/amd64/linux/linux_vdso_gtod.c @@ -0,0 +1,145 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * 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/elf.h> +#include <sys/errno.h> +#include <sys/proc.h> +#include <sys/stdarg.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 <amd64/linux/linux.h> +#include <amd64/linux/linux_syscall.h> +#include <compat/linux/linux_errno.h> +#include <compat/linux/linux_time.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> + +/* for debug purpose */ +static int +write(int fd, const void *buf, size_t size) +{ + int res; + + __asm__ __volatile__ + ( + "syscall" + : "=a"(res) + : "a"(LINUX_SYS_linux_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> |