Re: [PATCH 01/27] scripts: add generic syscalltbl.sh
From: Masahiro Yamada <masahiroy@kernel.org>
Date: 2021-01-28 01:09:46
Also in:
linux-alpha, linux-arch, linux-arm-kernel, linux-kbuild, linux-m68k, linux-mips, linux-sh, linux-um, lkml, sparclinux
On Thu, Jan 28, 2021 at 9:51 AM Masahiro Yamada [off-list ref] wrote:
quoted hunk ↗ jump to hunk
Most of architectures generate syscall headers at the compile time in the almost same way. The syscall table has the same format for all architectures. Each line has 3, 4 or 5 fields; syscall number, ABI, syscall name, native entry point, and compat entry point. The syscall table is processed by syscalltbl.sh script into header files. Despite the same pattern, scripts are maintained per architecture, which results in code duplication and bad maintainability. As of v5.11-rc1, 12 architectures duplicate similar shell scripts: $ find arch -name syscalltbl.sh | sort arch/alpha/kernel/syscalls/syscalltbl.sh arch/arm/tools/syscalltbl.sh arch/ia64/kernel/syscalls/syscalltbl.sh arch/m68k/kernel/syscalls/syscalltbl.sh arch/microblaze/kernel/syscalls/syscalltbl.sh arch/mips/kernel/syscalls/syscalltbl.sh arch/parisc/kernel/syscalls/syscalltbl.sh arch/powerpc/kernel/syscalls/syscalltbl.sh arch/sh/kernel/syscalls/syscalltbl.sh arch/sparc/kernel/syscalls/syscalltbl.sh arch/x86/entry/syscalls/syscalltbl.sh arch/xtensa/kernel/syscalls/syscalltbl.sh My goal is to unify them into a single file, scripts/syscalltbl.sh. For example, the i386 syscall table looks like this: 0 i386 restart_syscall sys_restart_syscall 1 i386 exit sys_exit 2 i386 fork sys_fork 3 i386 read sys_read 4 i386 write sys_write 5 i386 open sys_open compat_sys_open ... scripts/syscalltbl.sh generates the following code: __SYSCALL(0, sys_restart_syscall) __SYSCALL(1, sys_exit) __SYSCALL(2, sys_fork) __SYSCALL(3, sys_read) __SYSCALL(4, sys_write) __SYSCALL_WITH_COMPAT(5, sys_open, compat_sys_open) ... Then, the i386 kernel will do: #define __SYSCALL_WITH_COMPAT(nr, native, compat) __SYSCALL(nr, native) and the x86_64 kernel will do: #define __SYSCALL_WITH_COMPAT(nr, native, compat) __SYSCALL(nr, compat) I noticed all 32/64 bit architectures can be covered by the same pattern. Having an arch-specific script is fine if there is a good reason to do so, but a single generic script should work for this case. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> --- scripts/syscalltbl.sh | 52 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 scripts/syscalltbl.shdiff --git a/scripts/syscalltbl.sh b/scripts/syscalltbl.sh new file mode 100644 index 000000000000..15bf4e09f88c --- /dev/null +++ b/scripts/syscalltbl.sh@@ -0,0 +1,52 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0-only +# +# Usage: +# scripts/syscalltbl.sh INFILE OUTFILE [ABIS] [OFFSET] +# +# INFILE: input syscall table +# OUTFILE: output file +# ABIS (optional): specify the ABIs to handle. +# If omitted, all lines are handled. +# OFFSET (optinal): spefify the offset of the syscall numbers. +# If omitted, the offset is zero. +# +# The syscall table format: +# nr abi name native [compat]
This line should be nr abi name [native] [compat] because the native entry point is also optional. (if it is missing, sys_ni_syscall is used)
+# +# nr: syscall number +# abi: ABI name +# name: syscall name +# native: native entry point
native (optional): native entry point
+# compat (optional): compat entry point
+
+set -e
+
+in="$1"
+out="$2"
+abis=$(echo "($3)" | tr ',' '|')
+offset="${4:-0}"
+
+nxt=$offset
+
+grep -E "^[0-9]+[[:space:]]+${abis}" "$in" | sort -n | {
+
+ while read nr abi name native compat ; do
+
+ nr=$((nr + $offset))
+
+ while [ $nxt -lt $nr ]; do
+ echo "__SYSCALL($nxt, sys_ni_syscall)"
+ nxt=$((nxt + 1))
+ done
+
+ if [ -n "$compat" ]; then
+ echo "__SYSCALL_WITH_COMPAT($nr, $native, $compat)"
+ elif [ -n "$native" ]; then
+ echo "__SYSCALL($nr, $native)"
+ else
+ echo "__SYSCALL($nr, sys_ni_syscall)"
+ fi
+ nxt=$((nr + 1))
+ done
+} > "$out"
--
2.27.0-- Best Regards Masahiro Yamada