Some useful information for writing assembly code on 64bit linux

asminfo.md

Integer registers

R0  R1  R2  R3  R4  R5  R6  R7  R8  R9  R10  R11  R12  R13  R14  R15
RAX RCX RDX RBX RSP RBP RSI RDI

R0D R1D R2D R3D R4D R5D R6D R7D R8D R9D R10D R11D R12D R13D R14D R15D
EAX ECX EDX EBX ESP EBP ESI EDI

R0W R1W R2W R3W R4W R5W R6W R7W R8W R9W R10W R11W R12W R13W R14W R15W
AX  CX  DX  BX  SP  BP  SI  DI

R0B R1B R2B R3B R4B R5B R6B R7B R8B R9B R10B R11B R12B R13B R14B R15B
AL  CL  DL  BL  SPL BPL SIL DIL

AH  CH  DH  BH

XMM0 ... XMM15

rflags for comparison

s
ns 
z (zero)
nz (not zero)
c 
nc 
o 
no 
p 
np 
pe 
po 
e (equal)
ne (not equal)
l (less)
nl (not less)
le (less/equal)
nle (not less/equal)
g (greater)
ng (not greater)
ge (great/equal)
nge (not great/equal)
a 
na 
ae 
nae 
b 
nb 
be 
nbe

Linux System Call Table for x86_64

Taken from here.

%rax	System call	%rdi	%rsi	%rdx	%r10	%r8	%r9
0	sys_read	unsigned int fd	char *buf	size_t count
1	sys_write	unsigned int fd	const char *buf	size_t count
2	sys_open	const char *filename	int flags	int mode
3	sys_close	unsigned int fd
4	sys_stat	const char *filename	struct stat *statbuf
5	sys_fstat	unsigned int fd	struct stat *statbuf
6	sys_lstat	fconst char *filename	struct stat *statbuf
7	sys_poll	struct poll_fd *ufds	unsigned int nfds	long timeout_msecs
8	sys_lseek	unsigned int fd	off_t offset	unsigned int origin
9	sys_mmap	unsigned long addr	unsigned long len	unsigned long prot	unsigned long flags	unsigned long fd	unsigned long off
10	sys_mprotect	unsigned long start	size_t len	unsigned long prot
11	sys_munmap	unsigned long addr	size_t len
12	sys_brk	unsigned long brk
13	sys_rt_sigaction	int sig	const struct sigaction *act	struct sigaction *oact	size_t sigsetsize
14	sys_rt_sigprocmask	int how	sigset_t *nset	sigset_t *oset	size_t sigsetsize
15	sys_rt_sigreturn	unsigned long __unused
16	sys_ioctl	unsigned int fd	unsigned int cmd	unsigned long arg
17	sys_pread64	unsigned long fd	char *buf	size_t count	loff_t pos
18	sys_pwrite64	unsigned int fd	const char *buf	size_t count	loff_t pos
19	sys_readv	unsigned long fd	const struct iovec *vec	unsigned long vlen
20	sys_writev	unsigned long fd	const struct iovec *vec	unsigned long vlen
21	sys_access	const char *filename	int mode
22	sys_pipe	int *filedes
23	sys_select	int n	fd_set *inp	fd_set *outp	fd_set*exp	struct timeval *tvp
24	sys_sched_yield
25	sys_mremap	unsigned long addr	unsigned long old_len	unsigned long new_len	unsigned long flags	unsigned long new_addr
26	sys_msync	unsigned long start	size_t len	int flags
27	sys_mincore	unsigned long start	size_t len	unsigned char *vec
28	sys_madvise	unsigned long start	size_t len_in	int behavior
29	sys_shmget	key_t key	size_t size	int shmflg
30	sys_shmat	int shmid	char *shmaddr	int shmflg
31	sys_shmctl	int shmid	int cmd	struct shmid_ds *buf
32	sys_dup	unsigned int fildes
33	sys_dup2	unsigned int oldfd	unsigned int newfd
34	sys_pause
35	sys_nanosleep	struct timespec *rqtp	struct timespec *rmtp
36	sys_getitimer	int which	struct itimerval *value
37	sys_alarm	unsigned int seconds
38	sys_setitimer	int which	struct itimerval *value	struct itimerval *ovalue
39	sys_getpid
40	sys_sendfile	int out_fd	int in_fd	off_t *offset	size_t count
41	sys_socket	int family	int type	int protocol
42	sys_connect	int fd	struct sockaddr *uservaddr	int addrlen
43	sys_accept	int fd	struct sockaddr *upeer_sockaddr	int *upeer_addrlen
44	sys_sendto	int fd	void *buff	size_t len	unsigned flags	struct sockaddr *addr	int addr_len
45	sys_recvfrom	int fd	void *ubuf	size_t size	unsigned flags	struct sockaddr *addr	int *addr_len
46	sys_sendmsg	int fd	struct msghdr *msg	unsigned flags
47	sys_recvmsg	int fd	struct msghdr *msg	unsigned int flags
48	sys_shutdown	int fd	int how
49	sys_bind	int fd	struct sokaddr *umyaddr	int addrlen
50	sys_listen	int fd	int backlog
51	sys_getsockname	int fd	struct sockaddr *usockaddr	int *usockaddr_len
52	sys_getpeername	int fd	struct sockaddr *usockaddr	int *usockaddr_len
53	sys_socketpair	int family	int type	int protocol	int *usockvec
54	sys_setsockopt	int fd	int level	int optname	char *optval	int optlen
55	sys_getsockopt	int fd	int level	int optname	char *optval	int *optlen
56	sys_clone	unsigned long clone_flags	unsigned long newsp	void *parent_tid	void *child_tid
57	sys_fork
58	sys_vfork
59	sys_execve	const char *filename	const char *const argv[]	const char *const envp[]
60	sys_exit	int error_code
61	sys_wait4	pid_t upid	int *stat_addr	int options	struct rusage *ru
62	sys_kill	pid_t pid	int sig
63	sys_uname	struct old_utsname *name
64	sys_semget	key_t key	int nsems	int semflg
65	sys_semop	int semid	struct sembuf *tsops	unsigned nsops
66	sys_semctl	int semid	int semnum	int cmd	union semun arg
67	sys_shmdt	char *shmaddr
68	sys_msgget	key_t key	int msgflg
69	sys_msgsnd	int msqid	struct msgbuf *msgp	size_t msgsz	int msgflg
70	sys_msgrcv	int msqid	struct msgbuf *msgp	size_t msgsz	long msgtyp	int msgflg
71	sys_msgctl	int msqid	int cmd	struct msqid_ds *buf
72	sys_fcntl	unsigned int fd	unsigned int cmd	unsigned long arg
73	sys_flock	unsigned int fd	unsigned int cmd
74	sys_fsync	unsigned int fd
75	sys_fdatasync	unsigned int fd
76	sys_truncate	const char *path	long length
77	sys_ftruncate	unsigned int fd	unsigned long length
78	sys_getdents	unsigned int fd	struct linux_dirent *dirent	unsigned int count
79	sys_getcwd	char *buf	unsigned long size
80	sys_chdir	const char *filename
81	sys_fchdir	unsigned int fd
82	sys_rename	const char *oldname	const char *newname
83	sys_mkdir	const char *pathname	int mode
84	sys_rmdir	const char *pathname
85	sys_creat	const char *pathname	int mode
86	sys_link	const char *oldname	const char *newname
87	sys_unlink	const char *pathname
88	sys_symlink	const char *oldname	const char *newname
89	sys_readlink	const char *path	char *buf	int bufsiz
90	sys_chmod	const char *filename	mode_t mode
91	sys_fchmod	unsigned int fd	mode_t mode
92	sys_chown	const char *filename	uid_t user	gid_t group
93	sys_fchown	unsigned int fd	uid_t user	gid_t group
94	sys_lchown	const char *filename	uid_t user	gid_t group
95	sys_umask	int mask
96	sys_gettimeofday	struct timeval *tv	struct timezone *tz
97	sys_getrlimit	unsigned int resource	struct rlimit *rlim
98	sys_getrusage	int who	struct rusage *ru
99	sys_sysinfo	struct sysinfo *info
100	sys_times	struct sysinfo *info
101	sys_ptrace	long request	long pid	unsigned long addr	unsigned long data
102	sys_getuid
103	sys_syslog	int type	char *buf	int len
104	sys_getgid
105	sys_setuid	uid_t uid
106	sys_setgid	gid_t gid
107	sys_geteuid
108	sys_getegid
109	sys_setpgid	pid_t pid	pid_t pgid
110	sys_getppid
111	sys_getpgrp
112	sys_setsid
113	sys_setreuid	uid_t ruid	uid_t euid
114	sys_setregid	gid_t rgid	gid_t egid
115	sys_getgroups	int gidsetsize	gid_t *grouplist
116	sys_setgroups	int gidsetsize	gid_t *grouplist
117	sys_setresuid	uid_t *ruid	uid_t *euid	uid_t *suid
118	sys_getresuid	uid_t *ruid	uid_t *euid	uid_t *suid
119	sys_setresgid	gid_t rgid	gid_t egid	gid_t sgid
120	sys_getresgid	gid_t *rgid	gid_t *egid	gid_t *sgid
121	sys_getpgid	pid_t pid
122	sys_setfsuid	uid_t uid
123	sys_setfsgid	gid_t gid
124	sys_getsid	pid_t pid
125	sys_capget	cap_user_header_t header	cap_user_data_t dataptr
126	sys_capset	cap_user_header_t header	const cap_user_data_t data
127	sys_rt_sigpending	sigset_t *set	size_t sigsetsize
128	sys_rt_sigtimedwait	const sigset_t *uthese	siginfo_t *uinfo	const struct timespec *uts	size_t sigsetsize
129	sys_rt_sigqueueinfo	pid_t pid	int sig	siginfo_t *uinfo
130	sys_rt_sigsuspend	sigset_t *unewset	size_t sigsetsize
131	sys_sigaltstack	const stack_t *uss	stack_t *uoss
132	sys_utime	char *filename	struct utimbuf *times
133	sys_mknod	const char *filename	umode_t mode	unsigned dev
134	sys_uselib	NOT IMPLEMENTED
135	sys_personality	unsigned int personality
136	sys_ustat	unsigned dev	struct ustat *ubuf
137	sys_statfs	const char *pathname	struct statfs *buf
138	sys_fstatfs	unsigned int fd	struct statfs *buf
139	sys_sysfs	int option	unsigned long arg1	unsigned long arg2
140	sys_getpriority	int which	int who
141	sys_setpriority	int which	int who	int niceval
142	sys_sched_setparam	pid_t pid	struct sched_param *param
143	sys_sched_getparam	pid_t pid	struct sched_param *param
144	sys_sched_setscheduler	pid_t pid	int policy	struct sched_param *param
145	sys_sched_getscheduler	pid_t pid
146	sys_sched_get_priority_max	int policy
147	sys_sched_get_priority_min	int policy
148	sys_sched_rr_get_interval	pid_t pid	struct timespec *interval
149	sys_mlock	unsigned long start	size_t len
150	sys_munlock	unsigned long start	size_t len
151	sys_mlockall	int flags
152	sys_munlockall
153	sys_vhangup
154	sys_modify_ldt	int func	void *ptr	unsigned long bytecount
155	sys_pivot_root	const char *new_root	const char *put_old
156	sys__sysctl	struct __sysctl_args *args
157	sys_prctl	int option	unsigned long arg2	unsigned long arg3	unsigned long arg4	unsigned long arg5
158	sys_arch_prctl	struct task_struct *task	int code	unsigned long *addr
159	sys_adjtimex	struct timex *txc_p
160	sys_setrlimit	unsigned int resource	struct rlimit *rlim
161	sys_chroot	const char *filename
162	sys_sync
163	sys_acct	const char *name
164	sys_settimeofday	struct timeval *tv	struct timezone *tz
165	sys_mount	char *dev_name	char *dir_name	char *type	unsigned long flags	void *data
166	sys_umount2	const char *target	int flags
167	sys_swapon	const char *specialfile	int swap_flags
168	sys_swapoff	const char *specialfile
169	sys_reboot	int magic1	int magic2	unsigned int cmd	void *arg
170	sys_sethostname	char *name	int len
171	sys_setdomainname	char *name	int len
172	sys_iopl	unsigned int level	struct pt_regs *regs
173	sys_ioperm	unsigned long from	unsigned long num	int turn_on
174	sys_create_module	REMOVED IN Linux 2.6
175	sys_init_module	void *umod	unsigned long len	const char *uargs
176	sys_delete_module	const chat *name_user	unsigned int flags
177	sys_get_kernel_syms	REMOVED IN Linux 2.6
178	sys_query_module	REMOVED IN Linux 2.6
179	sys_quotactl	unsigned int cmd	const char *special	qid_t id	void *addr
180	sys_nfsservctl	NOT IMPLEMENTED
181	sys_getpmsg	NOT IMPLEMENTED
182	sys_putpmsg	NOT IMPLEMENTED
183	sys_afs_syscall	NOT IMPLEMENTED
184	sys_tuxcall	NOT IMPLEMENTED
185	sys_security	NOT IMPLEMENTED
186	sys_gettid
187	sys_readahead	int fd	loff_t offset	size_t count
188	sys_setxattr	const char *pathname	const char *name	const void *value	size_t size	int flags
189	sys_lsetxattr	const char *pathname	const char *name	const void *value	size_t size	int flags
190	sys_fsetxattr	int fd	const char *name	const void *value	size_t size	int flags
191	sys_getxattr	const char *pathname	const char *name	void *value	size_t size
192	sys_lgetxattr	const char *pathname	const char *name	void *value	size_t size
193	sys_fgetxattr	int fd	const har *name	void *value	size_t size
194	sys_listxattr	const char *pathname	char *list	size_t size
195	sys_llistxattr	const char *pathname	char *list	size_t size
196	sys_flistxattr	int fd	char *list	size_t size
197	sys_removexattr	const char *pathname	const char *name
198	sys_lremovexattr	const char *pathname	const char *name
199	sys_fremovexattr	int fd	const char *name
200	sys_tkill	pid_t pid	ing sig
201	sys_time	time_t *tloc
202	sys_futex	u32 *uaddr	int op	u32 val	struct timespec *utime	u32 *uaddr2	u32 val3
203	sys_sched_setaffinity	pid_t pid	unsigned int len	unsigned long *user_mask_ptr
204	sys_sched_getaffinity	pid_t pid	unsigned int len	unsigned long *user_mask_ptr
205	sys_set_thread_area	NOT IMPLEMENTED. Use arch_prctl
206	sys_io_setup	unsigned nr_events	aio_context_t *ctxp
207	sys_io_destroy	aio_context_t ctx
208	sys_io_getevents	aio_context_t ctx_id	long min_nr	long nr	struct io_event *events
209	sys_io_submit	aio_context_t ctx_id	long nr	struct iocb **iocbpp
210	sys_io_cancel	aio_context_t ctx_id	struct iocb *iocb	struct io_event *result
211	sys_get_thread_area	NOT IMPLEMENTED. Use arch_prctl
212	sys_lookup_dcookie	u64 cookie64	long buf	long len
213	sys_epoll_create	int size
214	sys_epoll_ctl_old	NOT IMPLEMENTED
215	sys_epoll_wait_old	NOT IMPLEMENTED
216	sys_remap_file_pages	unsigned long start	unsigned long size	unsigned long prot	unsigned long pgoff	unsigned long flags
217	sys_getdents64	unsigned int fd	struct linux_dirent64 *dirent	unsigned int count
218	sys_set_tid_address	int *tidptr
219	sys_restart_syscall
220	sys_semtimedop	int semid	struct sembuf *tsops	unsigned nsops	const struct timespec *timeout
221	sys_fadvise64	int fd	loff_t offset	size_t len	int advice
222	sys_timer_create	const clockid_t which_clock	struct sigevent *timer_event_spec	timer_t *created_timer_id
223	sys_timer_settime	timer_t timer_id	int flags	const struct itimerspec *new_setting	struct itimerspec *old_setting
224	sys_timer_gettime	timer_t timer_id	struct itimerspec *setting
225	sys_timer_getoverrun	timer_t timer_id
226	sys_timer_delete	timer_t timer_id
227	sys_clock_settime	const clockid_t which_clock	const struct timespec *tp
228	sys_clock_gettime	const clockid_t which_clock	struct timespec *tp
229	sys_clock_getres	const clockid_t which_clock	struct timespec *tp
230	sys_clock_nanosleep	const clockid_t which_clock	int flags	const struct timespec *rqtp	struct timespec *rmtp
231	sys_exit_group	int error_code
232	sys_epoll_wait	int epfd	struct epoll_event *events	int maxevents	int timeout
233	sys_epoll_ctl	int epfd	int op	int fd	struct epoll_event *event
234	sys_tgkill	pid_t tgid	pid_t pid	int sig
235	sys_utimes	char *filename	struct timeval *utimes
236	sys_vserver	NOT IMPLEMENTED
237	sys_mbind	unsigned long start	unsigned long len	unsigned long mode	unsigned long *nmask	unsigned long maxnode	unsigned flags
238	sys_set_mempolicy	int mode	unsigned long *nmask	unsigned long maxnode
239	sys_get_mempolicy	int *policy	unsigned long *nmask	unsigned long maxnode	unsigned long addr	unsigned long flags
240	sys_mq_open	const char *u_name	int oflag	mode_t mode	struct mq_attr *u_attr
241	sys_mq_unlink	const char *u_name
242	sys_mq_timedsend	mqd_t mqdes	const char *u_msg_ptr	size_t msg_len	unsigned int msg_prio	const stuct timespec *u_abs_timeout
243	sys_mq_timedreceive	mqd_t mqdes	char *u_msg_ptr	size_t msg_len	unsigned int *u_msg_prio	const struct timespec *u_abs_timeout
244	sys_mq_notify	mqd_t mqdes	const struct sigevent *u_notification
245	sys_mq_getsetattr	mqd_t mqdes	const struct mq_attr *u_mqstat	struct mq_attr *u_omqstat
246	sys_kexec_load	unsigned long entry	unsigned long nr_segments	struct kexec_segment *segments	unsigned long flags
247	sys_waitid	int which	pid_t upid	struct siginfo *infop	int options	struct rusage *ru
248	sys_add_key	const char *_type	const char *_description	const void *_payload	size_t plen
249	sys_request_key	const char *_type	const char *_description	const char *_callout_info	key_serial_t destringid
250	sys_keyctl	int option	unsigned long arg2	unsigned long arg3	unsigned long arg4	unsigned long arg5
251	sys_ioprio_set	int which	int who	int ioprio
252	sys_ioprio_get	int which	int who
253	sys_inotify_init
254	sys_inotify_add_watch	int fd	const char *pathname	u32 mask
255	sys_inotify_rm_watch	int fd	__s32 wd
256	sys_migrate_pages	pid_t pid	unsigned long maxnode	const unsigned long *old_nodes	const unsigned long *new_nodes
257	sys_openat	int dfd	const char *filename	int flags	int mode
258	sys_mkdirat	int dfd	const char *pathname	int mode
259	sys_mknodat	int dfd	const char *filename	int mode	unsigned dev
260	sys_fchownat	int dfd	const char *filename	uid_t user	gid_t group	int flag
261	sys_futimesat	int dfd	const char *filename	struct timeval *utimes
262	sys_newfstatat	int dfd	const char *filename	struct stat *statbuf	int flag
263	sys_unlinkat	int dfd	const char *pathname	int flag
264	sys_renameat	int oldfd	const char *oldname	int newfd	const char *newname
265	sys_linkat	int oldfd	const char *oldname	int newfd	const char *newname	int flags
266	sys_symlinkat	const char *oldname	int newfd	const char *newname
267	sys_readlinkat	int dfd	const char *pathname	char *buf	int bufsiz
268	sys_fchmodat	int dfd	const char *filename	mode_t mode
269	sys_faccessat	int dfd	const char *filename	int mode
270	sys_pselect6	int n	fd_set *inp	fd_set *outp	fd_set *exp	struct timespec *tsp	void *sig
271	sys_ppoll	struct pollfd *ufds	unsigned int nfds	struct timespec *tsp	const sigset_t *sigmask	size_t sigsetsize
272	sys_unshare	unsigned long unshare_flags
273	sys_set_robust_list	struct robust_list_head *head	size_t len
274	sys_get_robust_list	int pid	struct robust_list_head **head_ptr	size_t *len_ptr
275	sys_splice	int fd_in	loff_t *off_in	int fd_out	loff_t *off_out	size_t len	unsigned int flags
276	sys_tee	int fdin	int fdout	size_t len	unsigned int flags
277	sys_sync_file_range	long fd	loff_t offset	loff_t bytes	long flags
278	sys_vmsplice	int fd	const struct iovec *iov	unsigned long nr_segs	unsigned int flags
279	sys_move_pages	pid_t pid	unsigned long nr_pages	const void **pages	const int *nodes	int *status	int flags
280	sys_utimensat	int dfd	const char *filename	struct timespec *utimes	int flags
281	sys_epoll_pwait	int epfd	struct epoll_event *events	int maxevents	int timeout	const sigset_t *sigmask	size_t sigsetsize
282	sys_signalfd	int ufd	sigset_t *user_mask	size_t sizemask
283	sys_timerfd_create	int clockid	int flags
284	sys_eventfd	unsigned int count
285	sys_fallocate	long fd	long mode	loff_t offset	loff_t len
286	sys_timerfd_settime	int ufd	int flags	const struct itimerspec *utmr	struct itimerspec *otmr
287	sys_timerfd_gettime	int ufd	struct itimerspec *otmr
288	sys_accept4	int fd	struct sockaddr *upeer_sockaddr	int *upeer_addrlen	int flags
289	sys_signalfd4	int ufd	sigset_t *user_mask	size_t sizemask	int flags
290	sys_eventfd2	unsigned int count	int flags
291	sys_epoll_create1	int flags
292	sys_dup3	unsigned int oldfd	unsigned int newfd	int flags
293	sys_pipe2	int *filedes	int flags
294	sys_inotify_init1	int flags
295	sys_preadv	unsigned long fd	const struct iovec *vec	unsigned long vlen	unsigned long pos_l	unsigned long pos_h
296	sys_pwritev	unsigned long fd	const struct iovec *vec	unsigned long vlen	unsigned long pos_l	unsigned long pos_h
297	sys_rt_tgsigqueueinfo	pid_t tgid	pid_t pid	int sig	siginfo_t *uinfo
298	sys_perf_event_open	struct perf_event_attr *attr_uptr	pid_t pid	int cpu	int group_fd	unsigned long flags
299	sys_recvmmsg	int fd	struct msghdr *mmsg	unsigned int vlen	unsigned int flags	struct timespec *timeout
300	sys_fanotify_init	unsigned int flags	unsigned int event_f_flags
301	sys_fanotify_mark	long fanotify_fd	long flags	__u64 mask	long dfd	long pathname
302	sys_prlimit64	pid_t pid	unsigned int resource	const struct rlimit64 *new_rlim	struct rlimit64 *old_rlim
303	sys_name_to_handle_at	int dfd	const char *name	struct file_handle *handle	int *mnt_id	int flag
304	sys_open_by_handle_at	int dfd	const char *name	struct file_handle *handle	int *mnt_id	int flags
305	sys_clock_adjtime	clockid_t which_clock	struct timex *tx
306	sys_syncfs	int fd
307	sys_sendmmsg	int fd	struct mmsghdr *mmsg	unsigned int vlen	unsigned int flags
308	sys_setns	int fd	int nstype
309	sys_getcpu	unsigned *cpup	unsigned *nodep	struct getcpu_cache *unused
310	sys_process_vm_readv	pid_t pid	const struct iovec *lvec	unsigned long liovcnt	const struct iovec *rvec	unsigned long riovcnt	unsigned long flags
311	sys_process_vm_writev	pid_t pid	const struct iovec *lvec	unsigned long liovcnt	const struct iovcc *rvec	unsigned long riovcnt	unsigned long flags
312	sys_kcmp	pid_t pid1	pid_t pid2	int type	unsigned long idx1	unsigned long idx2
313	sys_finit_module	int fd	const char __user *uargs	int flags
314	sys_sched_setattr	pid_t pid	struct sched_attr __user *attr	unsigned int flags
315	sys_sched_getattr	pid_t pid	struct sched_attr __user *attr	unsigned int size	unsigned int flags
316	sys_renameat2	int olddfd	const char __user *oldname	int newdfd	const char __user *newname	unsigned int flags
317	sys_seccomp	unsigned int op	unsigned int flags	const char __user *uargs
318	sys_getrandom	char __user *buf	size_t count	unsigned int flags
319	sys_memfd_create	const char __user *uname_ptr	unsigned
int flags
320	sys_kexec_file_load	int kernel_fd	int initrd_fd	unsigned long cmdline_len	const char __user *cmdline_ptr	unsigned long flags
321	sys_bpf	int cmd	union bpf_attr *attr	unsigned int size
322	stub_execveat	int dfd	const char __user *filename	const char __user *const __user *argv	const char __user *const __user *envp	int flags
323	userfaultfd	int flags
324	membarrier	int cmd	int flags
325	mlock2	unsigned long start	size_t len	int flags
326	copy_file_range	int fd_in	loff_t __user *off_in	int fd_out	loff_t __user * off_out	size_t len	unsigned int flags
327	preadv2	unsigned long fd	const struct iovec __user *vec	unsigned long vlen	unsigned long pos_l	unsigned long pos_h	int flags
328	pwritev2	unsigned long fd	const struct iovec __user *vec	unsigned long vlen	unsigned long pos_l	unsigned long pos_h	int flags