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linux(4): Add a simple rseq syscall implementation.

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To avoid annoyng messages from glibc-2.35 test suite add the simple
implementation of rseq syscall which is do nothing for now.

I plan to implement it if and when the API stabilizes.

MFC after:	2 weeks
This commit is contained in:
Dmitry Chagin 2022-04-26 19:35:56 +03:00
parent 75e409495f
commit ee55d560e8
4 changed files with 89 additions and 3 deletions
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1
sys/compat/linux/linux_dummy.c
View File

@ -144,7 +144,6 @@ DUMMY(epoll_pwait2);
DUMMY(mount_setattr);
/* Linux 4.18: */
DUMMY(io_pgetevents);
DUMMY(rseq);
/* Linux 5.0: */
DUMMY(pidfd_send_signal);
DUMMY(io_uring_setup);

87
sys/compat/linux/linux_rseq.c Normal file
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@ -0,0 +1,87 @@
/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2022 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/param.h>
#include <sys/systm.h>
#ifdef COMPAT_LINUX32
#include <machine/../linux32/linux.h>
#include <machine/../linux32/linux32_proto.h>
#else
#include <machine/../linux/linux.h>
#include <machine/../linux/linux_proto.h>
#endif
enum linux_rseq_cpu_id_state {
LINUX_RSEQ_CPU_ID_UNINITIALIZED = -1,
LINUX_RSEQ_CPU_ID_REGISTRATION_FAILED = -2,
};
enum linux_rseq_flags {
LINUX_RSEQ_FLAG_UNREGISTER = (1 << 0),
};
enum linux_rseq_cs_flags_bit {
LINUX_RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT_BIT = 0,
LINUX_RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL_BIT = 1,
LINUX_RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE_BIT = 2,
};
enum linux_rseq_cs_flags {
LINUX_RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT =
(1U << LINUX_RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT_BIT),
LINUX_RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL =
(1U << LINUX_RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL_BIT),
LINUX_RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE =
(1U << LINUX_RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE_BIT),
};
struct linux_rseq_cs {
uint32_t version;
uint32_t flags;
uint64_t start_ip;
uint64_t post_commit_offset;
uint64_t abort_ip;
} __attribute__((aligned(4 * sizeof(uint64_t))));
struct linux_rseq {
uint32_t cpu_id_start;
uint32_t cpu_id;
uint64_t rseq_cs;
uint32_t flags;
} __attribute__((aligned(4 * sizeof(uint64_t))));
int
linux_rseq(struct thread *td, struct linux_rseq_args *args)
{
return (ENOSYS);
}

2
sys/modules/linux/Makefile
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@ -16,7 +16,7 @@ SRCS= linux_fork.c linux${SFX}_dummy_machdep.c linux_file.c linux_event.c \
linux${SFX}_machdep.c linux_misc.c linux_signal.c \
linux_socket.c linux_stats.c linux_sysctl.c linux${SFX}_sysent.c \
linux${SFX}_sysvec.c linux_uid16.c linux_time.c \
linux_timer.c linux_vdso.c \
linux_timer.c linux_vdso.c linux_rseq.c \
opt_inet6.h opt_compat.h opt_posix.h opt_usb.h vnode_if.h \
device_if.h bus_if.h
.if ${MACHINE_CPUARCH} == "i386" || ${MACHINE_CPUARCH} == "amd64"

2
sys/modules/linux64/Makefile
View File

@ -10,7 +10,7 @@ SRCS= linux_elf64.c linux_fork.c linux_dummy_machdep.c linux_file.c \
linux_event.c linux_futex.c linux_getcwd.c linux_ioctl.c linux_ipc.c \
linux_machdep.c linux_misc.c linux_ptrace.c linux_signal.c \
linux_socket.c linux_stats.c linux_sysctl.c linux_sysent.c \
linux_sysvec.c linux_time.c linux_vdso.c linux_timer.c \
linux_sysvec.c linux_time.c linux_vdso.c linux_timer.c linux_rseq.c \
opt_compat.h opt_inet6.h opt_posix.h opt_usb.h \
vnode_if.h device_if.h bus_if.h \
linux_support.s