linux-kernel - [PATCH v2 0/7] System call table generation support

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Message-Id: <1538057720-3392-1-git-send-email-firoz.khan@linaro.org>
Date:   Thu, 27 Sep 2018 19:45:13 +0530
From:   Firoz Khan <firoz.khan@...aro.org>
To:     linux-ia64@...r.kernel.org, Tony Luck <tony.luck@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Kate Stewart <kstewart@...uxfoundation.org>
Cc:     y2038@...ts.linaro.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, arnd@...db.de, deepa.kernel@...il.com,
        marcin.juszkiewicz@...aro.org, firoz.khan@...aro.org
Subject: [PATCH v2 0/7] System call table generation support

The purpose of this patch series is:
1. We can easily add/modify/delete system call by changing entry 
in syscall.tbl file. No need to manually edit many files.

2. It is easy to unify the system call implementation across all 
the architectures. 

The system call tables are in different format in all architecture 
and it will be difficult to manually add or modify the system calls
in the respective files manually. To make it easy by keeping a script 
and which'll generate the header file and syscall table file so this 
change will unify them across all architectures.

syscall.tbl contains the list of available system calls along with 
system call number and corresponding entry point. Add a new system 
call in this architecture will be possible by adding new entry in 
the syscall.tbl file.

Adding a new table entry consisting of:
        - System call number.
        - ABI.
        - System call name.
        - Entry point name.
        - Compat entry name, if required.

ARM, s390 and x86 architecuture does exist the similar support. I 
leverage their implementation to come up with a generic solution.

I have done the same support for work for alpha, microblaze, sparc,
mips, parisc, powerpc, sh, sparc, and xtensa. But I started sending 
the patch for one architecuture for review. Below mentioned git
repository contains more details.
Git repo:- https://github.com/frzkhn/system_call_table_generator/

Added an extra patch to add __NR_old_getpagesize macro.
Added an extra patch to keep __IGNORE* entries in asm/unistd.h.

Finally, this is the ground work for solving the Y2038 issue. We 
need to add/change two dozen of system calls to solve Y2038 issue. 
So this patch series will help to easily modify from existing 
system call to Y2038 compatible system calls.

Firoz Khan (7):
  ia64: add __NR_old_getpagesize macro
  ia64: replace NR_syscalls macro from asm/unistd.h
  ia64: add an offset for system call number
  ia64: replace the system call table entries from entry.S
  ia64: add system call table generation support
  ia64: uapi header and system call table file generation
  ia64: add __IGNORE* entries in asm/unistd.h

 arch/ia64/Makefile                      |   3 +
 arch/ia64/include/asm/Kbuild            |   1 +
 arch/ia64/include/asm/unistd.h          |  13 +-
 arch/ia64/include/uapi/asm/Kbuild       |   1 +
 arch/ia64/include/uapi/asm/unistd.h     | 334 +-------------------------------
 arch/ia64/kernel/entry.S                | 333 +------------------------------
 arch/ia64/kernel/syscall_table.S        |  12 ++
 arch/ia64/kernel/syscalls/Makefile      |  40 ++++
 arch/ia64/kernel/syscalls/syscall.tbl   | 328 +++++++++++++++++++++++++++++++
 arch/ia64/kernel/syscalls/syscallhdr.sh |  35 ++++
 arch/ia64/kernel/syscalls/syscalltbl.sh |  34 ++++
 11 files changed, 469 insertions(+), 665 deletions(-)
 create mode 100644 arch/ia64/kernel/syscall_table.S
 create mode 100644 arch/ia64/kernel/syscalls/Makefile
 create mode 100644 arch/ia64/kernel/syscalls/syscall.tbl
 create mode 100644 arch/ia64/kernel/syscalls/syscallhdr.sh
 create mode 100644 arch/ia64/kernel/syscalls/syscalltbl.sh

-- 
1.9.1