[PATCH 00/17] arch: convert everything to syscall.tbl

Arnd Bergmann
2024-07-04T14:36:40Z

From: Arnd Bergmann <arnd@arndb.de>

There are eight architectures using include/uapi/asm-generic/unistd.h,
which is still in an old format and not easily parsed by scripts.
In addition, arm64 uses the old format for the 32-bit arm compat syscalls,
despite them using the modern syscall.tbl format for the native calls.

As part of a larger cleanup, this converts all of them to use the new
format with a shared file. I was planning to post this earlier, but ended
up fixing up any system calls that have mismatched calling conventions
between kernel and userspace first, as that seemed more important.

I originally tried adding the same arch/*/kernel/syscalls/Makefile as used
on the other architectures, but ended up simplifying this in the process
to use a single set of Makefile rules in scripts/Makefile.asm-headers,
which in turn requires a few cleanups to arch/*/include/asm/Kbuild files.

Another prerequisite included in here is to make sys_clone3 get provided
on all architectures, though it remains broken and returns -ENOSYS on
hexagon, nios2, sh and sparc. To preserve the compile-time warning,
I added an explicit #warning for those that are marked broken.

Once we have the new table format in place everywhere, additional
improvements I have planned will be much easier, including:

- generating machine-readable syscall API descriptions for each
syscall on each architecture

- type checking to ensure that the in-kernel prototype matches
what userspace tools see

- unifying the last common bits of all tables so that new syscalls
only need to get added in one place

- generate human-readable wrappers for native and compat syscalls
on all architectures to replace the SYSCALL_DEFINEx() macros.

Arnd

Arnd Bergmann (17):
syscalls: add generic scripts/syscall.tbl
csky: drop asm/gpio.h wrapper
um: don't generate asm/bpf_perf_event.h
loongarch: avoid generating extra header files
kbuild: verify asm-generic header list
kbuild: add syscall table generation to scripts/Makefile.asm-headers
clone3: drop __ARCH_WANT_SYS_CLONE3 macro
arc: convert to generic syscall table
arm64: convert unistd_32.h to syscall.tbl format
arm64: generate 64-bit syscall.tbl
arm64: rework compat syscall macros
csky: convert to generic syscall table
hexagon: use new system call table
loongarch: convert to generic syscall table
nios2: convert to generic syscall table
openrisc: convert to generic syscall table
riscv: convert to generic syscall table

Makefile | 2 +-
arch/alpha/include/asm/unistd.h | 1 +
arch/arc/include/asm/Kbuild | 2 +
arch/arc/include/asm/unistd.h | 14 +
arch/arc/include/uapi/asm/Kbuild | 2 +
arch/arc/include/uapi/asm/unistd.h | 44 +-
arch/arc/kernel/Makefile.syscalls | 3 +
arch/arc/kernel/sys.c | 5 +-
arch/arm/include/asm/unistd.h | 1 -
arch/arm64/include/asm/Kbuild | 8 +
arch/arm64/include/asm/seccomp.h | 13 +-
arch/arm64/include/asm/unistd.h | 22 +-
arch/arm64/include/asm/unistd32.h | 939 +-----------------
.../include/asm/vdso/compat_gettimeofday.h | 12 +-
arch/arm64/include/uapi/asm/Kbuild | 1 +
arch/arm64/include/uapi/asm/unistd.h | 25 +-
arch/arm64/kernel/Makefile.syscalls | 6 +
arch/arm64/kernel/signal32.c | 2 +-
arch/arm64/kernel/sigreturn32.S | 18 +-
arch/arm64/kernel/sys.c | 6 +-
arch/arm64/kernel/sys32.c | 17 +-
arch/arm64/kernel/syscall.c | 3 +-
arch/arm64/tools/Makefile | 6 +-
arch/arm64/tools/syscall_32.tbl | 476 +++++++++
arch/arm64/tools/syscall_64.tbl | 1 +
arch/csky/include/asm/Kbuild | 3 +-
arch/csky/include/asm/unistd.h | 3 +
arch/csky/include/uapi/asm/Kbuild | 2 +
arch/csky/include/uapi/asm/unistd.h | 15 +-
arch/csky/kernel/Makefile.syscalls | 4 +
arch/csky/kernel/syscall_table.c | 4 +-
arch/hexagon/include/asm/Kbuild | 2 +
arch/hexagon/include/asm/unistd.h | 10 +
arch/hexagon/include/uapi/asm/Kbuild | 2 +
arch/hexagon/include/uapi/asm/unistd.h | 13 +-
arch/hexagon/kernel/Makefile.syscalls | 3 +
arch/hexagon/kernel/syscalltab.c | 8 +-
arch/loongarch/include/asm/Kbuild | 17 +-
arch/loongarch/include/asm/unistd.h | 2 +
arch/loongarch/include/uapi/asm/Kbuild | 2 +
arch/loongarch/include/uapi/asm/unistd.h | 4 +-
arch/loongarch/kernel/Makefile.syscalls | 4 +
arch/loongarch/kernel/syscall.c | 3 +-
arch/m68k/include/asm/unistd.h | 1 -
arch/microblaze/include/asm/unistd.h | 2 +
arch/mips/include/asm/unistd.h | 1 -
arch/nios2/include/asm/Kbuild | 2 +
arch/nios2/include/asm/unistd.h | 10 +
arch/nios2/include/uapi/asm/Kbuild | 2 +
arch/nios2/include/uapi/asm/unistd.h | 14 +-
arch/nios2/kernel/Makefile.syscalls | 3 +
arch/nios2/kernel/syscall_table.c | 6 +-
arch/openrisc/include/asm/Kbuild | 2 +
arch/openrisc/include/asm/syscalls.h | 4 -
arch/openrisc/include/asm/unistd.h | 8 +
arch/openrisc/include/uapi/asm/Kbuild | 2 +
arch/openrisc/include/uapi/asm/unistd.h | 15 +-
arch/openrisc/kernel/Makefile.syscalls | 3 +
arch/openrisc/kernel/sys_call_table.c | 9 +-
arch/parisc/include/asm/unistd.h | 1 -
arch/powerpc/include/asm/unistd.h | 1 -
arch/riscv/include/asm/Kbuild | 3 +
arch/riscv/include/asm/syscall_table.h | 7 +
arch/riscv/include/asm/unistd.h | 13 +-
arch/riscv/include/uapi/asm/Kbuild | 2 +
arch/riscv/include/uapi/asm/unistd.h | 41 +-
arch/riscv/kernel/Makefile.syscalls | 4 +
arch/riscv/kernel/compat_syscall_table.c | 6 +-
arch/riscv/kernel/syscall_table.c | 6 +-
arch/s390/include/asm/unistd.h | 1 -
arch/sh/include/asm/unistd.h | 2 +
arch/sparc/include/asm/unistd.h | 2 +
arch/um/include/asm/Kbuild | 1 -
arch/um/include/asm/bpf_perf_event.h | 3 +
arch/x86/include/asm/unistd.h | 1 -
arch/xtensa/include/asm/unistd.h | 1 -
include/asm-generic/Kbuild | 1 -
include/uapi/asm-generic/unistd.h | 4 -
kernel/fork.c | 8 +-
kernel/sys_ni.c | 2 -
scripts/Makefile.asm-generic | 58 --
scripts/Makefile.asm-headers | 98 ++
scripts/syscall.tbl | 404 ++++++++
tools/arch/arm64/include/uapi/asm/unistd.h | 1 -
.../arch/loongarch/include/uapi/asm/unistd.h | 1 -
tools/include/uapi/asm-generic/unistd.h | 4 -
86 files changed, 1219 insertions(+), 1271 deletions(-)
create mode 100644 arch/arc/include/asm/unistd.h
create mode 100644 arch/arc/kernel/Makefile.syscalls
create mode 100644 arch/arm64/kernel/Makefile.syscalls
create mode 100644 arch/arm64/tools/syscall_32.tbl
create mode 120000 arch/arm64/tools/syscall_64.tbl
create mode 100644 arch/csky/kernel/Makefile.syscalls
create mode 100644 arch/hexagon/include/asm/unistd.h
create mode 100644 arch/hexagon/kernel/Makefile.syscalls
create mode 100644 arch/loongarch/kernel/Makefile.syscalls
create mode 100644 arch/nios2/include/asm/unistd.h
create mode 100644 arch/nios2/kernel/Makefile.syscalls
create mode 100644 arch/openrisc/include/asm/unistd.h
create mode 100644 arch/openrisc/kernel/Makefile.syscalls
create mode 100644 arch/riscv/include/asm/syscall_table.h
create mode 100644 arch/riscv/kernel/Makefile.syscalls
create mode 100644 arch/um/include/asm/bpf_perf_event.h
delete mode 100644 scripts/Makefile.asm-generic
create mode 100644 scripts/Makefile.asm-headers
create mode 100644 scripts/syscall.tbl

--
2.39.2

Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nicolas Schier <nicolas@fjasle.eu>
Cc: Vineet Gupta <vgupta@kernel.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Guo Ren <guoren@kernel.org>
Cc: Brian Cain <bcain@quicinc.com>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: WANG Xuerui <kernel@xen0n.name>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Rich Felker <dalias@libc.org>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Andreas Larsson <andreas@gaisler.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: linux-kbuild@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-snps-arc@lists.infradead.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-csky@vger.kernel.org
Cc: linux-hexagon@vger.kernel.org
Cc: loongarch@lists.linux.dev
Cc: linux-openrisc@vger.kernel.org
Cc: linux-riscv@lists.infradead.org
Cc: linux-arch@vger.kernel.org