[PATCH RFC v3 0/8] syscalls: Add a shared table for all archs

[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 and sparc, 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 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@xxxxxxxxxx

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@xxxxxxxxxx

---
André Almeida (8):
      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: Use the common syscall table

 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/syscalls/Makefile        | 27 +++++++---
 arch/mips/kernel/syscalls/syscall_n32.tbl | 68 -------------------------
 arch/mips/kernel/syscalls/syscall_n64.tbl | 48 ------------------
 arch/mips/kernel/syscalls/syscall_o32.tbl | 68 -------------------------
 arch/mips/kernel/syscalls/syscallnr.sh    | 26 ----------
 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                | 83 +++++++++++++++++++++++++++++++
 scripts/syscallhdr.sh                     | 62 +++++++++++++++++------
 scripts/syscalltbl.sh                     | 38 +++++++++++---
 18 files changed, 205 insertions(+), 571 deletions(-)
---
base-commit: 075b74841bd0065a3bda3440873c747938e69b68
change-id: 20260724-tonyk-syscall_table-928bbb1b26bb

Best regards,
--  
André Almeida <andrealmeid@xxxxxxxxxx>