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* [PATCH v4 00/12] syscalls: Add a shared table for all archs
@ 2026-08-12  3:32 André Almeida
  2026-08-12  3:32 ` [PATCH v4 01/12] syscalls: Make --abis parsing more robust André Almeida
                   ` (11 more replies)
  0 siblings, 12 replies; 19+ messages in thread
From: André Almeida @ 2026-08-12  3:32 UTC (permalink / raw)
  To: Thomas Gleixner, Nathan Chancellor, Masami Hiramatsu, Arnd Bergmanon
  Cc: linux-kernel, linux-kbuild, kernel-dev, André Almeida

While implementing a new syscall, we need to wire up it's number to the arch
table. Since syscall number 403, all architectures are on sync regarding the
number (except alpha), which make things a lot easier but more repetitive as
well. Have a look at commit b36d4b6aa88 ("arch: hookup listns() system call"),
with 15 lines of mostly:

  +470    common  listns                          sys_listns

There's already a "common" table shared with a bunch of archs at
`scripts/syscall.tbl`, but due to historical reasons some archs will never be
able to move to this table and share all the numbers.

The generic table starts from 403 (clock_gettime64), the first common syscall.

I've compile tested for arm32, arm64, s390, mips, sparc and alpha by comparing
the syscalls_*.h and unistd_*.h files generated before and after this patchset.
For most of cases the files are identical, for the few cases that they are not,
there's a note in the commit explaining why they are equivalent.

Thanks!
	André

Changes in v4:
- Replace cln3 with clone3 in the ABIs
- mips: Get rid of custom mips ABIs (o32, n32, n64) and use 32 and 64
- mips: Unify n32 and n64 tables
- Add alpha to the syscall party, along with it's adaptations
- Remove --no-compat option and define SYSCALL_WITH_COMPAT() macro for archs
that need it
- v3: https://patch.msgid.link/20260807-tonyk-syscall_table-v3-0-7c45a23c50b5@igalia.com

Changes in v3:
- Removed x86 for now, let's wait till x32 is dropped
- Added much more archs
- v2: https://patch.msgid.link/20260727-tonyk-syscall_table-v2-0-95d4f1ee471f@igalia.com

Changes in v2:
- Managed to move to the real first common syscall: 403 (clock_gettime64)
- Added -no-compat option to be used with x86_64
- v1: https://patch.msgid.link/20260724-tonyk-syscall_table-v1-0-9c53188423da@igalia.com

---
André Almeida (12):
      syscalls: Make --abis parsing more robust
      syscalls: Create unified partial table for all archs
      scripts/syscall.tbl: Use the common table
      arm: Use the common syscall table
      s390: Use the common syscall table
      sparc: Use the common syscall table
      mips: Remove duplicated syscallnr.sh
      mips: Get rid of custom mips ABIs for syscall tables
      mips: Use the common syscall table
      syscalls: Add an option for offsetting the common table
      alpha: Define entry point for set_mempolicy_home_node syscall
      alpha: Use the common syscall table

 arch/alpha/kernel/syscalls/Makefile       |  10 +-
 arch/alpha/kernel/syscalls/syscall.tbl    |  48 --
 arch/alpha/kernel/systbls.S               |   1 +
 arch/arm/tools/Makefile                   |  10 +-
 arch/arm/tools/syscall.tbl                |  68 ---
 arch/arm64/tools/syscall_32.tbl           |  68 ---
 arch/mips/kernel/scall64-n32.S            |   1 +
 arch/mips/kernel/scall64-n64.S            |   2 +
 arch/mips/kernel/syscalls/Makefile        |  31 +-
 arch/mips/kernel/syscalls/syscall_n.tbl   | 464 +++++++++++++++++
 arch/mips/kernel/syscalls/syscall_n32.tbl | 412 ---------------
 arch/mips/kernel/syscalls/syscall_n64.tbl | 388 --------------
 arch/mips/kernel/syscalls/syscall_o32.tbl | 826 ++++++++++++++----------------
 arch/mips/kernel/syscalls/syscallnr.sh    |  26 -
 arch/s390/kernel/syscall.c                |   2 +
 arch/s390/kernel/syscalls/Makefile        |   8 +-
 arch/s390/kernel/syscalls/syscall.tbl     |  48 --
 arch/sparc/kernel/syscalls/Makefile       |   8 +-
 arch/sparc/kernel/syscalls/syscall.tbl    |  68 ---
 scripts/Makefile.asm-headers              |   9 +-
 scripts/syscall.tbl                       |  68 ---
 scripts/syscall_common.tbl                |  84 +++
 scripts/syscallhdr.sh                     |  79 ++-
 scripts/syscalltbl.sh                     |  44 +-
 24 files changed, 1083 insertions(+), 1690 deletions(-)
---
base-commit: 075b74841bd0065a3bda3440873c747938e69b68
change-id: 20260724-tonyk-syscall_table-928bbb1b26bb

Best regards,
--  
André Almeida <andrealmeid@igalia.com>


^ permalink raw reply	[flat|nested] 19+ messages in thread

end of thread, other threads:[~2026-08-12 17:37 UTC | newest]

Thread overview: 19+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2026-08-12  3:32 [PATCH v4 00/12] syscalls: Add a shared table for all archs André Almeida
2026-08-12  3:32 ` [PATCH v4 01/12] syscalls: Make --abis parsing more robust André Almeida
2026-08-12  3:32 ` [PATCH v4 02/12] syscalls: Create unified partial table for all archs André Almeida
2026-08-12  3:32 ` [PATCH v4 03/12] scripts/syscall.tbl: Use the common table André Almeida
2026-08-12  3:33 ` [PATCH v4 04/12] arm: Use the common syscall table André Almeida
2026-08-12  3:33 ` [PATCH v4 05/12] s390: " André Almeida
2026-08-12  3:33 ` [PATCH v4 06/12] sparc: " André Almeida
2026-08-12  3:33 ` [PATCH v4 07/12] mips: Remove duplicated syscallnr.sh André Almeida
2026-08-12  3:33 ` [PATCH v4 08/12] mips: Get rid of custom mips ABIs for syscall tables André Almeida
2026-08-12  9:16   ` Arnd Bergmann
2026-08-12 12:53     ` André Almeida
2026-08-12 13:11       ` Arnd Bergmann
2026-08-12 17:36         ` André Almeida
2026-08-12  3:33 ` [PATCH v4 09/12] mips: Use the common syscall table André Almeida
2026-08-12  3:33 ` [PATCH v4 10/12] syscalls: Add an option for offsetting the common table André Almeida
2026-08-12  3:33 ` [PATCH v4 11/12] alpha: Define entry point for set_mempolicy_home_node syscall André Almeida
2026-08-12  3:33 ` [PATCH v4 12/12] alpha: Use the common syscall table André Almeida
2026-08-12  9:09   ` Arnd Bergmann
2026-08-12 12:55     ` André Almeida

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