ia64: add system call table generation support

The system call tables are in different format in all
architecture and it will be difficult to manually add,
modify or delete the syscall table entries in the res-
pective files. To make it easy by keeping a script and
which will generate the uapi header and syscall table
file. This change will also help to unify the implemen-
tation across all architectures.

The system call table generation script is added in
kernel/syscalls directory which contain the scripts to
generate both uapi header file and system call table
files. The syscall.tbl will be input for the scripts.

syscall.tbl contains the list of available system calls
along with system call number and corresponding entry
point. Add a new system call in this architecture will
be possible by adding new entry in the syscall.tbl file.

Adding a new table entry consisting of:
  	- System call number.
	- ABI.
	- System call name.
	- Entry point name.

syscallhdr.sh and syscalltbl.sh will generate uapi header
unistd_64.h and syscall_table.h files respectively. Both
.sh files will parse the content syscall.tbl to generate
the header and table files. unistd_64.h will be included
by uapi/asm/unistd.h and syscall_table.h is included by
kernel/entry.S - the real system call table.

ARM, s390 and x86 architecuture does have similar support.
I leverage their implementation to come up with a generic
solution.
Signed-off-by: Firoz Khan <firoz.khan@linaro.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/syscalls/Makefile

+# SPDX-License-Identifier: GPL-2.0
+kapi := arch/$(SRCARCH)/include/generated/asm
+uapi := arch/$(SRCARCH)/include/generated/uapi/asm
+
+_dummy := $(shell [ -d '$(uapi)' ] || mkdir -p '$(uapi)')	\
+	  $(shell [ -d '$(kapi)' ] || mkdir -p '$(kapi)')
+
+syscall := $(srctree)/$(src)/syscall.tbl
+syshdr := $(srctree)/$(src)/syscallhdr.sh
+systbl := $(srctree)/$(src)/syscalltbl.sh
+
+quiet_cmd_syshdr = SYSHDR  $@
+      cmd_syshdr = $(CONFIG_SHELL) '$(syshdr)' '$<' '$@'	\
+		   '$(syshdr_abis_$(basetarget))'		\
+		   '$(syshdr_pfx_$(basetarget))'		\
+		   '$(syshdr_offset_$(basetarget))'
+
+quiet_cmd_systbl = SYSTBL  $@
+      cmd_systbl = $(CONFIG_SHELL) '$(systbl)' '$<' '$@'	\
+		   '$(systbl_abis_$(basetarget))'		\
+		   '$(systbl_abi_$(basetarget))'		\
+		   '$(systbl_offset_$(basetarget))'
+
+syshdr_offset_unistd_64 := __NR_Linux
+$(uapi)/unistd_64.h: $(syscall) $(syshdr)
+	$(call if_changed,syshdr)
+
+systbl_offset_syscall_table := 1024
+$(kapi)/syscall_table.h: $(syscall) $(systbl)
+	$(call if_changed,systbl)
+
+uapisyshdr-y		+= unistd_64.h
+kapisyshdr-y		+= syscall_table.h
+
+targets	+= $(uapisyshdr-y) $(kapisyshdr-y)
+
+PHONY += all
+all: $(addprefix $(uapi)/,$(uapisyshdr-y))
+all: $(addprefix $(kapi)/,$(kapisyshdr-y))
+	@:

arch/ia64/kernel/syscalls/syscall.tbl

+# SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
+#
+# Linux system call numbers and entry vectors for ia64
+#
+# The format is:
+# <number> <abi> <name> <entry point>
+#
+# Add 1024 to <number> will get the actual system call number
+#
+# The <abi> is always "common" for this file
+#
+0	common	ni_syscall			sys_ni_syscall
+1	common	exit				sys_exit
+2	common	read				sys_read
+3	common	write				sys_write
+4	common	open				sys_open
+5	common	close				sys_close
+6	common	creat				sys_creat
+7	common	link				sys_link
+8	common	unlink				sys_unlink
+9	common	execve				ia64_execve
+10	common	chdir				sys_chdir
+11	common	fchdir				sys_fchdir
+12	common	utimes				sys_utimes
+13	common	mknod				sys_mknod
+14	common	chmod				sys_chmod
+15	common	chown				sys_chown
+16	common	lseek				sys_lseek
+17	common	getpid				sys_getpid
+18	common	getppid				sys_getppid
+19	common	mount				sys_mount
+20	common	umount				sys_umount
+21	common	setuid				sys_setuid
+22	common	getuid				sys_getuid
+23	common	geteuid				sys_geteuid
+24	common	ptrace				sys_ptrace
+25	common	access				sys_access
+26	common	sync				sys_sync
+27	common	fsync				sys_fsync
+28	common	fdatasync			sys_fdatasync
+29	common	kill				sys_kill
+30	common	rename				sys_rename
+31	common	mkdir				sys_mkdir
+32	common	rmdir				sys_rmdir
+33	common	dup				sys_dup
+34	common	pipe				sys_ia64_pipe
+35	common	times				sys_times
+36	common	brk				ia64_brk
+37	common	setgid				sys_setgid
+38	common	getgid				sys_getgid
+39	common	getegid				sys_getegid
+40	common	acct				sys_acct
+41	common	ioctl				sys_ioctl
+42	common	fcntl				sys_fcntl
+43	common	umask				sys_umask
+44	common	chroot				sys_chroot
+45	common	ustat				sys_ustat
+46	common	dup2				sys_dup2
+47	common	setreuid			sys_setreuid
+48	common	setregid			sys_setregid
+49	common	getresuid			sys_getresuid
+50	common	setresuid			sys_setresuid
+51	common	getresgid			sys_getresgid
+52	common	setresgid			sys_setresgid
+53	common	getgroups			sys_getgroups
+54	common	setgroups			sys_setgroups
+55	common	getpgid				sys_getpgid
+56	common	setpgid				sys_setpgid
+57	common	setsid				sys_setsid
+58	common	getsid				sys_getsid
+59	common	sethostname			sys_sethostname
+60	common	setrlimit			sys_setrlimit
+61	common	getrlimit			sys_getrlimit
+62	common	getrusage			sys_getrusage
+63	common	gettimeofday			sys_gettimeofday
+64	common	settimeofday			sys_settimeofday
+65	common	select				sys_select
+66	common	poll				sys_poll
+67	common	symlink				sys_symlink
+68	common	readlink			sys_readlink
+69	common	uselib				sys_uselib
+70	common	swapon				sys_swapon
+71	common	swapoff				sys_swapoff
+72	common	reboot				sys_reboot
+73	common	truncate			sys_truncate
+74	common	ftruncate			sys_ftruncate
+75	common	fchmod				sys_fchmod
+76	common	fchown				sys_fchown
+77	common	getpriority			ia64_getpriority
+78	common	setpriority			sys_setpriority
+79	common	statfs				sys_statfs
+80	common	fstatfs				sys_fstatfs
+81	common	gettid				sys_gettid
+82	common	semget				sys_semget
+83	common	semop				sys_semop
+84	common	semctl				sys_semctl
+85	common	msgget				sys_msgget
+86	common	msgsnd				sys_msgsnd
+87	common	msgrcv				sys_msgrcv
+88	common	msgctl				sys_msgctl
+89	common	shmget				sys_shmget
+90	common	shmat				sys_shmat
+91	common	shmdt				sys_shmdt
+92	common	shmctl				sys_shmctl
+93	common	syslog				sys_syslog
+94	common	setitimer			sys_setitimer
+95	common	getitimer			sys_getitimer
+# 1120 was old_stat
+# 1121 was old_lstat
+# 1122 was old_fstat
+99	common	vhangup				sys_vhangup
+100	common	lchown				sys_lchown
+101	common	remap_file_pages		sys_remap_file_pages
+102	common	wait4				sys_wait4
+103	common	sysinfo				sys_sysinfo
+104	common	clone				sys_clone
+105	common	setdomainname			sys_setdomainname
+106	common	uname				sys_newuname
+107	common	adjtimex			sys_adjtimex
+# 1132 was create_module
+109	common	init_module			sys_init_module
+110	common	delete_module			sys_delete_module
+# 1135 was get_kernel_syms
+# 1136 was query_module
+113	common	quotactl			sys_quotactl
+114	common	bdflush				sys_bdflush
+115	common	sysfs				sys_sysfs
+116	common	personality			sys_personality
+117	common	afs_syscall			sys_ni_syscall
+118	common	setfsuid			sys_setfsuid
+119	common	setfsgid			sys_setfsgid
+120	common	getdents			sys_getdents
+121	common	flock				sys_flock
+122	common	readv				sys_readv
+123	common	writev				sys_writev
+124	common	pread64				sys_pread64
+125	common	pwrite64			sys_pwrite64
+126	common	_sysctl				sys_sysctl
+127	common	mmap				sys_mmap
+128	common	munmap				sys_munmap
+129	common	mlock				sys_mlock
+130	common	mlockall			sys_mlockall
+131	common	mprotect			sys_mprotect
+132	common	mremap				ia64_mremap
+133	common	msync				sys_msync
+134	common	munlock				sys_munlock
+135	common	munlockall			sys_munlockall
+136	common	sched_getparam			sys_sched_getparam
+137	common	sched_setparam			sys_sched_setparam
+138	common	sched_getscheduler		sys_sched_getscheduler
+139	common	sched_setscheduler		sys_sched_setscheduler
+140	common	sched_yield			sys_sched_yield
+141	common	sched_get_priority_max		sys_sched_get_priority_max
+142	common	sched_get_priority_min		sys_sched_get_priority_min
+143	common	sched_rr_get_interval		sys_sched_rr_get_interval
+144	common	nanosleep			sys_nanosleep
+145	common	nfsservctl			sys_ni_syscall
+146	common	prctl				sys_prctl
+147	common	old_getpagesize			sys_getpagesize
+148	common	mmap2				sys_mmap2
+149	common	pciconfig_read			sys_pciconfig_read
+150	common	pciconfig_write			sys_pciconfig_write
+151	common	perfmonctl			sys_perfmonctl
+152	common	sigaltstack			sys_sigaltstack
+153	common	rt_sigaction			sys_rt_sigaction
+154	common	rt_sigpending			sys_rt_sigpending
+155	common	rt_sigprocmask			sys_rt_sigprocmask
+156	common	rt_sigqueueinfo			sys_rt_sigqueueinfo
+157	common	rt_sigreturn			sys_rt_sigreturn
+158	common	rt_sigsuspend			sys_rt_sigsuspend
+159	common	rt_sigtimedwait			sys_rt_sigtimedwait
+160	common	getcwd				sys_getcwd
+161	common	capget				sys_capget
+162	common	capset				sys_capset
+163	common	sendfile			sys_sendfile64
+164	common	getpmsg				sys_ni_syscall
+165	common	putpmsg				sys_ni_syscall
+166	common	socket				sys_socket
+167	common	bind				sys_bind
+168	common	connect				sys_connect
+169	common	listen				sys_listen
+170	common	accept				sys_accept
+171	common	getsockname			sys_getsockname
+172	common	getpeername			sys_getpeername
+173	common	socketpair			sys_socketpair
+174	common	send				sys_send
+175	common	sendto				sys_sendto
+176	common	recv				sys_recv
+177	common	recvfrom			sys_recvfrom
+178	common	shutdown			sys_shutdown
+179	common	setsockopt			sys_setsockopt
+180	common	getsockopt			sys_getsockopt
+181	common	sendmsg				sys_sendmsg
+182	common	recvmsg				sys_recvmsg
+183	common	pivot_root			sys_pivot_root
+184	common	mincore				sys_mincore
+185	common	madvise				sys_madvise
+186	common	stat				sys_newstat
+187	common	lstat				sys_newlstat
+188	common	fstat				sys_newfstat
+189	common	clone2				sys_clone2
+190	common	getdents64			sys_getdents64
+191	common	getunwind			sys_getunwind
+192	common	readahead			sys_readahead
+193	common	setxattr			sys_setxattr
+194	common	lsetxattr			sys_lsetxattr
+195	common	fsetxattr			sys_fsetxattr
+196	common	getxattr			sys_getxattr
+197	common	lgetxattr			sys_lgetxattr
+198	common	fgetxattr			sys_fgetxattr
+199	common	listxattr			sys_listxattr
+200	common	llistxattr			sys_llistxattr
+201	common	flistxattr			sys_flistxattr
+202	common	removexattr			sys_removexattr
+203	common	lremovexattr			sys_lremovexattr
+204	common	fremovexattr			sys_fremovexattr
+205	common	tkill				sys_tkill
+206	common	futex				sys_futex
+207	common	sched_setaffinity		sys_sched_setaffinity
+208	common	sched_getaffinity		sys_sched_getaffinity
+209	common	set_tid_address			sys_set_tid_address
+210	common	fadvise64			sys_fadvise64_64
+211	common	tgkill				sys_tgkill
+212	common	exit_group			sys_exit_group
+213	common	lookup_dcookie			sys_lookup_dcookie
+214	common	io_setup			sys_io_setup
+215	common	io_destroy			sys_io_destroy
+216	common	io_getevents			sys_io_getevents
+217	common	io_submit			sys_io_submit
+218	common	io_cancel			sys_io_cancel
+219	common	epoll_create			sys_epoll_create
+220	common	epoll_ctl			sys_epoll_ctl
+221	common	epoll_wait			sys_epoll_wait
+222	common	restart_syscall			sys_restart_syscall
+223	common	semtimedop			sys_semtimedop
+224	common	timer_create			sys_timer_create
+225	common	timer_settime			sys_timer_settime
+226	common	timer_gettime			sys_timer_gettime
+227	common	timer_getoverrun		sys_timer_getoverrun
+228	common	timer_delete			sys_timer_delete
+229	common	clock_settime			sys_clock_settime
+230	common	clock_gettime			sys_clock_gettime
+231	common	clock_getres			sys_clock_getres
+232	common	clock_nanosleep			sys_clock_nanosleep
+233	common	fstatfs64			sys_fstatfs64
+234	common	statfs64			sys_statfs64
+235	common	mbind				sys_mbind
+236	common	get_mempolicy			sys_get_mempolicy
+237	common	set_mempolicy			sys_set_mempolicy
+238	common	mq_open				sys_mq_open
+239	common	mq_unlink			sys_mq_unlink
+240	common	mq_timedsend			sys_mq_timedsend
+241	common	mq_timedreceive			sys_mq_timedreceive
+242	common	mq_notify			sys_mq_notify
+243	common	mq_getsetattr			sys_mq_getsetattr
+244	common	kexec_load			sys_kexec_load
+245	common	vserver				sys_ni_syscall
+246	common	waitid				sys_waitid
+247	common	add_key				sys_add_key
+248	common	request_key			sys_request_key
+249	common	keyctl				sys_keyctl
+250	common	ioprio_set			sys_ioprio_set
+251	common	ioprio_get			sys_ioprio_get
+252	common	move_pages			sys_move_pages
+253	common	inotify_init			sys_inotify_init
+254	common	inotify_add_watch		sys_inotify_add_watch
+255	common	inotify_rm_watch		sys_inotify_rm_watch
+256	common	migrate_pages			sys_migrate_pages
+257	common	openat				sys_openat
+258	common	mkdirat				sys_mkdirat
+259	common	mknodat				sys_mknodat
+260	common	fchownat			sys_fchownat
+261	common	futimesat			sys_futimesat
+262	common	newfstatat			sys_newfstatat
+263	common	unlinkat			sys_unlinkat
+264	common	renameat			sys_renameat
+265	common	linkat				sys_linkat
+266	common	symlinkat			sys_symlinkat
+267	common	readlinkat			sys_readlinkat
+268	common	fchmodat			sys_fchmodat
+269	common	faccessat			sys_faccessat
+270	common	pselect6			sys_pselect6
+271	common	ppoll				sys_ppoll
+272	common	unshare				sys_unshare
+273	common	splice				sys_splice
+274	common	set_robust_list			sys_set_robust_list
+275	common	get_robust_list			sys_get_robust_list
+276	common	sync_file_range			sys_sync_file_range
+277	common	tee				sys_tee
+278	common	vmsplice			sys_vmsplice
+279	common	fallocate			sys_fallocate
+280	common	getcpu				sys_getcpu
+281	common	epoll_pwait			sys_epoll_pwait
+282	common	utimensat			sys_utimensat
+283	common	signalfd			sys_signalfd
+284	common	timerfd				sys_ni_syscall
+285	common	eventfd				sys_eventfd
+286	common	timerfd_create			sys_timerfd_create
+287	common	timerfd_settime			sys_timerfd_settime
+288	common	timerfd_gettime			sys_timerfd_gettime
+289	common	signalfd4			sys_signalfd4
+290	common	eventfd2			sys_eventfd2
+291	common	epoll_create1			sys_epoll_create1
+292	common	dup3				sys_dup3
+293	common	pipe2				sys_pipe2
+294	common	inotify_init1			sys_inotify_init1
+295	common	preadv				sys_preadv
+296	common	pwritev				sys_pwritev
+297	common	rt_tgsigqueueinfo		sys_rt_tgsigqueueinfo
+298	common	recvmmsg			sys_recvmmsg
+299	common	fanotify_init			sys_fanotify_init
+300	common	fanotify_mark			sys_fanotify_mark
+301	common	prlimit64			sys_prlimit64
+302	common	name_to_handle_at		sys_name_to_handle_at
+303	common	open_by_handle_at		sys_open_by_handle_at
+304	common	clock_adjtime			sys_clock_adjtime
+305	common	syncfs				sys_syncfs
+306	common	setns				sys_setns
+307	common	sendmmsg			sys_sendmmsg
+308	common	process_vm_readv		sys_process_vm_readv
+309	common	process_vm_writev		sys_process_vm_writev
+310	common	accept4				sys_accept4
+311	common	finit_module			sys_finit_module
+312	common	sched_setattr			sys_sched_setattr
+313	common	sched_getattr			sys_sched_getattr
+314	common	renameat2			sys_renameat2
+315	common	getrandom			sys_getrandom
+316	common	memfd_create			sys_memfd_create
+317	common	bpf				sys_bpf
+318	common	execveat			sys_execveat
+319	common	userfaultfd			sys_userfaultfd
+320	common	membarrier			sys_membarrier
+321	common	kcmp				sys_kcmp
+322	common	mlock2				sys_mlock2
+323	common	copy_file_range			sys_copy_file_range
+324	common	preadv2				sys_preadv2
+325	common	pwritev2			sys_pwritev2

arch/ia64/kernel/syscalls/syscallhdr.sh

+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+
+in="$1"
+out="$2"
+my_abis=`echo "($3)" | tr ',' '|'`
+prefix="$4"
+offset="$5"
+
+fileguard=_UAPI_ASM_IA64_`basename "$out" | sed \
+	-e 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/' \
+	-e 's/[^A-Z0-9_]/_/g' -e 's/__/_/g'`
+grep -E "^[0-9A-Fa-fXx]+[[:space:]]+${my_abis}" "$in" | sort -n | (
+	printf "#ifndef %s\n" "${fileguard}"
+	printf "#define %s\n" "${fileguard}"
+	printf "\n"
+
+	nxt=0
+	while read nr abi name entry ; do
+		if [ -z "$offset" ]; then
+			printf "#define __NR_%s%s\t%s\n" \
+				"${prefix}" "${name}" "${nr}"
+		else
+			printf "#define __NR_%s%s\t(%s + %s)\n" \
+				"${prefix}" "${name}" "${offset}" "${nr}"
+		fi
+		nxt=$((nr+1))
+	done
+
+	printf "\n"
+	printf "#ifdef __KERNEL__\n"
+	printf "#define __NR_syscalls\t%s\n" "${nxt}"
+	printf "#endif\n"
+	printf "\n"
+	printf "#endif /* %s */" "${fileguard}"
+) > "$out"

arch/ia64/kernel/syscalls/syscalltbl.sh

+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+
+in="$1"
+out="$2"
+my_abis=`echo "($3)" | tr ',' '|'`
+my_abi="$4"
+offset="$5"
+
+emit() {
+	t_nxt="$1"
+	t_nr="$2"
+	t_entry="$3"
+
+	while [ $t_nxt -lt $t_nr ]; do
+		printf "__SYSCALL(%s, sys_ni_syscall, )\n" "${t_nxt}"
+		t_nxt=$((t_nxt+1))
+	done
+	printf "__SYSCALL(%s, %s, )\n" "${t_nxt}" "${t_entry}"
+}
+
+grep -E "^[0-9A-Fa-fXx]+[[:space:]]+${my_abis}" "$in" | sort -n | (
+	nxt=0
+	if [ -z "$offset" ]; then
+		offset=0
+	fi
+
+	while read nr abi name entry ; do
+		emit $((nxt+offset)) $((nr+offset)) $entry
+		nxt=$((nr+1))
+	done
+) > "$out"