[PATCH RFC 1/4] syscalls: Create unified partial table for all archs
From: André Almeida
Date: Fri Jul 24 2026 - 16:02:21 EST
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.
Signed-off-by: André Almeida <andrealmeid@xxxxxxxxxx>
---
scripts/syscall_common.tbl | 34 ++++++++++++++++++++++++++++
scripts/syscallhdr.sh | 55 +++++++++++++++++++++++++++++++++++-----------
scripts/syscalltbl.sh | 26 +++++++++++++++++-----
3 files changed, 97 insertions(+), 18 deletions(-)
diff --git a/scripts/syscall_common.tbl b/scripts/syscall_common.tbl
new file mode 100644
index 000000000000..97ea46ea8d56
--- /dev/null
+++ b/scripts/syscall_common.tbl
@@ -0,0 +1,34 @@
+# SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
+#
+# syscall numbers shared by architectures
+
+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 22e34cd46b9b..77934a2d0f51 100755
--- a/scripts/syscallhdr.sh
+++ b/scripts/syscallhdr.sh
@@ -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 Use the common number table"
exit 1
}
@@ -34,6 +35,9 @@ abis=
emit_nr=
offset=
prefix=
+common_tbl=
+max=0
+COMMON_TBL_PATH="../scripts/syscall_common.tbl"
while [ $# -gt 0 ]
do
@@ -50,6 +54,9 @@ do
--prefix)
prefix=$2
shift 2;;
+ --common-tbl)
+ common_tbl=1
+ shift 1;;
-*)
echo "$1: unknown option" >&2
usage;;
@@ -69,13 +76,32 @@ guard=_UAPI_ASM_$(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
- while read nr abi name native compat ; do
+# gen_hdr(infile)
+gen_hdr() {
+ input=$1
+
+ while read nr abi name native compat; do
max=$nr
@@ -84,15 +110,18 @@ 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
+
+emit_nr $(($max + 1)) $prefix >> $outfile
+
+emit_end_guard >> $outfile
diff --git a/scripts/syscalltbl.sh b/scripts/syscalltbl.sh
index 6a903b87a7c2..30441cf88ead 100755
--- a/scripts/syscalltbl.sh
+++ b/scripts/syscalltbl.sh
@@ -23,11 +23,14 @@ usage() {
echo >&2
echo >&2 "options:"
echo >&2 " --abis ABIS ABI(s) to handle (By default, all lines are handled)"
+ echo >&2 " --common-tbl Use the common syscall number table"
exit 1
}
# default unless specified by options
abis=
+common_tbl=
+COMMON_TBL_PATH="../scripts/syscall_common.tbl"
while [ $# -gt 0 ]
do
@@ -35,6 +38,9 @@ do
--abis)
abis=$(echo "($2)" | tr ',' '|')
shift 2;;
+ --common-tbl)
+ common_tbl=1
+ shift 1;;
-*)
echo "$1: unknown option" >&2
usage;;
@@ -52,12 +58,14 @@ 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: $input: syscall table is not sorted or duplicates the same syscall number" >&2
exit 1
fi
@@ -72,7 +80,7 @@ grep -E "^[0-9]+[[:space:]]+$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 "$compat" ]; then
@@ -88,5 +96,13 @@ grep -E "^[0-9]+[[:space:]]+$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