[PATCH v5 02/13] syscalls: Create unified partial table for all archs
André Almeida
andrealmeid at igalia.com
Wed Aug 12 10:38:33 PDT 2026
To take advantage of the subset of syscall numbers that are guaranteed to
be shared, create a new table and adapt generation scripts to use it. In
that way, every new syscall can be added to a single file.
Create special ABIs in order to make the table work for different archs:
- `clone3` for archs that use the common clone3 entry
- `__clone3` for archs that use their own special entry point
Create flags for syscall Makefiles to use the common table.
Signed-off-by: André Almeida <andrealmeid at igalia.com>
---
scripts/syscall_common.tbl | 83 ++++++++++++++++++++++++++++++++++++++++++++++
scripts/syscallhdr.sh | 60 +++++++++++++++++++++++++--------
scripts/syscalltbl.sh | 29 ++++++++++++----
3 files changed, 152 insertions(+), 20 deletions(-)
diff --git a/scripts/syscall_common.tbl b/scripts/syscall_common.tbl
new file mode 100644
index 000000000000..81e326a8172f
--- /dev/null
+++ b/scripts/syscall_common.tbl
@@ -0,0 +1,83 @@
+# SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
+#
+# syscall numbers shared by all architectures
+#
+# The format is:
+# <number> <abi> <name> <entry point> [<compat entry point> [noreturn]]
+#
+# The abi can be "32", "clone3", "__cln3" and "memfd_secret"
+#
+# clone3 stands for the common clone3 entry, used by most archs. Some archs have
+# their special entry and should use "__clone3".
+#
+# "memfd_secret" is not implemented by every architecture
+
+403 32 clock_gettime64 sys_clock_gettime
+404 32 clock_settime64 sys_clock_settime
+405 32 clock_adjtime64 sys_clock_adjtime
+406 32 clock_getres_time64 sys_clock_getres
+407 32 clock_nanosleep_time64 sys_clock_nanosleep
+408 32 timer_gettime64 sys_timer_gettime
+409 32 timer_settime64 sys_timer_settime
+410 32 timerfd_gettime64 sys_timerfd_gettime
+411 32 timerfd_settime64 sys_timerfd_settime
+412 32 utimensat_time64 sys_utimensat
+413 32 pselect6_time64 sys_pselect6 compat_sys_pselect6_time64
+414 32 ppoll_time64 sys_ppoll compat_sys_ppoll_time64
+416 32 io_pgetevents_time64 sys_io_pgetevents compat_sys_io_pgetevents_time64
+417 32 recvmmsg_time64 sys_recvmmsg compat_sys_recvmmsg_time64
+418 32 mq_timedsend_time64 sys_mq_timedsend
+419 32 mq_timedreceive_time64 sys_mq_timedreceive
+420 32 semtimedop_time64 sys_semtimedop
+421 32 rt_sigtimedwait_time64 sys_rt_sigtimedwait compat_sys_rt_sigtimedwait_time64
+422 32 futex_time64 sys_futex
+423 32 sched_rr_get_interval_time64 sys_sched_rr_get_interval
+424 common pidfd_send_signal sys_pidfd_send_signal
+425 common io_uring_setup sys_io_uring_setup
+426 common io_uring_enter sys_io_uring_enter
+427 common io_uring_register sys_io_uring_register
+428 common open_tree sys_open_tree
+429 common move_mount sys_move_mount
+430 common fsopen sys_fsopen
+431 common fsconfig sys_fsconfig
+432 common fsmount sys_fsmount
+433 common fspick sys_fspick
+434 common pidfd_open sys_pidfd_open
+435 clone3 clone3 sys_clone3
+435 __clone3 clone3 __sys_clone3
+436 common close_range sys_close_range
+437 common openat2 sys_openat2
+438 common pidfd_getfd sys_pidfd_getfd
+439 common faccessat2 sys_faccessat2
+440 common process_madvise sys_process_madvise
+441 common epoll_pwait2 sys_epoll_pwait2 compat_sys_epoll_pwait2
+442 common mount_setattr sys_mount_setattr
+443 common quotactl_fd sys_quotactl_fd
+444 common landlock_create_ruleset sys_landlock_create_ruleset
+445 common landlock_add_rule sys_landlock_add_rule
+446 common landlock_restrict_self sys_landlock_restrict_self
+447 memfd_secret memfd_secret sys_memfd_secret
+448 common process_mrelease sys_process_mrelease
+449 common futex_waitv sys_futex_waitv
+450 common set_mempolicy_home_node sys_set_mempolicy_home_node
+451 common cachestat sys_cachestat
+452 common fchmodat2 sys_fchmodat2
+453 common map_shadow_stack sys_map_shadow_stack
+454 common futex_wake sys_futex_wake
+455 common futex_wait sys_futex_wait
+456 common futex_requeue sys_futex_requeue
+457 common statmount sys_statmount
+458 common listmount sys_listmount
+459 common lsm_get_self_attr sys_lsm_get_self_attr
+460 common lsm_set_self_attr sys_lsm_set_self_attr
+461 common lsm_list_modules sys_lsm_list_modules
+462 common mseal sys_mseal
+463 common setxattrat sys_setxattrat
+464 common getxattrat sys_getxattrat
+465 common listxattrat sys_listxattrat
+466 common removexattrat sys_removexattrat
+467 common open_tree_attr sys_open_tree_attr
+468 common file_getattr sys_file_getattr
+469 common file_setattr sys_file_setattr
+470 common listns sys_listns
+471 common rseq_slice_yield sys_rseq_slice_yield
diff --git a/scripts/syscallhdr.sh b/scripts/syscallhdr.sh
index bad1ab606a0f..54e09d3e686c 100755
--- a/scripts/syscallhdr.sh
+++ b/scripts/syscallhdr.sh
@@ -16,7 +16,7 @@
set -e
usage() {
- echo >&2 "usage: $0 [--abis ABIS] [--emit-nr] [--offset OFFSET] [--prefix PREFIX] INFILE OUTFILE" >&2
+ echo >&2 "usage: $0 [--abis ABIS] [--emit-nr] [--offset OFFSET] [--prefix PREFIX] [--common-tbl PATH] INFILE OUTFILE" >&2
echo >&2
echo >&2 " INFILE input syscall table"
echo >&2 " OUTFILE output header file"
@@ -26,6 +26,7 @@ usage() {
echo >&2 " --emit-nr Emit the macro of the number of syscalls (__NR_syscalls)"
echo >&2 " --offset OFFSET The offset of syscall numbers"
echo >&2 " --prefix PREFIX The prefix to the macro like __NR_<PREFIX><NAME>"
+ echo >&2 " --common-tbl PATH Use the common number table"
exit 1
}
@@ -34,6 +35,8 @@ abis=
emit_nr=
offset=
prefix=
+common_tbl=
+common_tbl_path=
while [ $# -gt 0 ]
do
@@ -50,6 +53,10 @@ do
--prefix)
prefix=$2
shift 2;;
+ --common-tbl)
+ common_tbl=1
+ common_tbl_path=$2
+ shift 2;;
-*)
echo "$1: unknown option" >&2
usage;;
@@ -69,13 +76,33 @@ guard=_UAPI_ASM_$(basename "$outfile" |
sed -e 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/' \
-e 's/[^A-Z0-9_]/_/g' -e 's/__/_/g')
-grep -E "^[0-9A-Fa-fXx]+[[:space:]]+$abis" "$infile" | {
+emit_start_guard() {
echo "#ifndef $guard"
echo "#define $guard"
echo
+}
+
+# emit_nr(prefix, nr)
+emit_nr() {
+ local nr=$1
+ local prefix=$2
+ echo
+ echo "#ifdef __KERNEL__"
+ echo "#define __NR_${prefix}syscalls $nr"
+ echo "#endif"
+}
+
+emit_end_guard() {
+ echo
+ echo "#endif /* $guard */"
+}
+
+max=0
+# gen_hdr(infile)
+gen_hdr() {
+ input=$1
- max=0
- while read nr abi name native compat ; do
+ while read nr abi name native compat; do
max=$nr
@@ -84,15 +111,20 @@ grep -E "^[0-9A-Fa-fXx]+[[:space:]]+$abis" "$infile" | {
fi
echo "#define __NR_$prefix$name $nr"
- done
- if [ -n "$emit_nr" ]; then
- echo
- echo "#ifdef __KERNEL__"
- echo "#define __NR_${prefix}syscalls $(($max + 1))"
- echo "#endif"
- fi
+ done < <(grep -E "^[0-9A-Fa-fXx]+[[:space:]]+$abis" "$input")
+}
- echo
- echo "#endif /* $guard */"
-} > "$outfile"
+emit_start_guard > $outfile
+
+gen_hdr $infile >> $outfile
+
+if [ -n "$common_tbl" ]; then
+ gen_hdr $common_tbl_path >> "$outfile"
+fi
+
+if [ -n "$emit_nr" ]; then
+ emit_nr $(($max + 1)) $prefix >> $outfile
+fi
+
+emit_end_guard >> $outfile
diff --git a/scripts/syscalltbl.sh b/scripts/syscalltbl.sh
index c4b1f85c2dd6..91c135143b22 100755
--- a/scripts/syscalltbl.sh
+++ b/scripts/syscalltbl.sh
@@ -16,18 +16,21 @@
set -e
usage() {
- echo >&2 "usage: $0 [--abis ABIS] INFILE OUTFILE" >&2
+ echo >&2 "usage: $0 [--abis ABIS] [--common-tbl PATH] INFILE OUTFILE" >&2
echo >&2
echo >&2 " INFILE input syscall table"
echo >&2 " OUTFILE output header file"
echo >&2
echo >&2 "options:"
echo >&2 " --abis ABIS ABI(s) to handle (By default, all lines are handled)"
+ echo >&2 " --common-tbl PATH Use the common syscall number table"
exit 1
}
# default unless specified by options
abis=
+common_tbl=
+common_tbl_path=
while [ $# -gt 0 ]
do
@@ -35,6 +38,10 @@ do
--abis)
abis="($(echo "${2%,}" | tr ',' '|'))"
shift 2;;
+ --common-tbl)
+ common_tbl=1
+ common_tbl_path=$2
+ shift 2;;
-*)
echo "$1: unknown option" >&2
usage;;
@@ -52,12 +59,14 @@ outfile="$2"
nxt=0
-grep -E "^[0-9]+[[:space:]]+$abis" "$infile" | {
+# gen_tbl(infile)
+gen_tbl() {
+ input=$1
while read nr abi name native compat noreturn; do
if [ $nxt -gt $nr ]; then
- echo "error: $infile: syscall table is not sorted or duplicates the same syscall number" >&2
+ echo "error: $input: syscall table is not sorted or duplicates the same syscall number" >&2
exit 1
fi
@@ -72,7 +81,7 @@ grep -E "^[0-9]+[[:space:]]+$abis" "$infile" | {
if [ -n "$noreturn" ]; then
if [ "$noreturn" != "noreturn" ]; then
- echo "error: $infile: invalid string \"$noreturn\" in 'noreturn' column"
+ echo "error: $input: invalid string \"$noreturn\" in 'noreturn' column"
exit 1
fi
if [ -n "$compat" ]; then
@@ -88,5 +97,13 @@ grep -E "^[0-9]+[[:space:]]+$abis" "$infile" | {
echo "__SYSCALL($nr, sys_ni_syscall)"
fi
nxt=$((nr + 1))
- done
-} > "$outfile"
+
+ done < <(grep -E "^[0-9]+[[:space:]]+$abis" "$input")
+
+}
+
+gen_tbl $infile > "$outfile"
+
+if [ -n "$common_tbl" ]; then
+ gen_tbl $common_tbl_path >> "$outfile"
+fi
--
2.55.0
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