linux-kernel - [PATCH v4 00/18] x86: syscall wrapper cleanups

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Date:   Fri, 13 Mar 2020 15:51:26 -0400
From:   Brian Gerst <brgerst@...il.com>
To:     linux-kernel@...r.kernel.org, x86@...nel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Brian Gerst <brgerst@...il.com>
Subject: [PATCH v4 00/18] x86: syscall wrapper cleanups

This patch series cleans up the x86 syscall wrapper code and converts
the 32-bit native kernel over to pt_regs based syscalls.  This makes
the 32-bit syscall interface consistent with 64-bit, and a bit more
effecient by not blindly pushing all 6 potential arguments onto the
stack.

Changes since v3:
- Addressed feedback from v3
- Split the X32 syscall table into its own file
- Move the ABI prefix from the syscall table to the wrapper macros
- Additional cleanups
- Changed series title due to broader scope

Changes since v2:
- Moved adding the [compat_]sys_ prefix to the ABI-level macros

Changes since v1:
- Split patch 1 into multiple patches
- Updated comments and patch notes to clarify changes

Brian Gerst (18):
  x86, syscalls: Refactor SYSCALL_DEFINEx macros
  x86, syscalls: Refactor SYSCALL_DEFINE0 macros
  x86, syscalls: Refactor COND_SYSCALL macros
  x86, syscalls: Refactor SYS_NI macros
  x86-64: Use syscall wrappers for x32_rt_sigreturn
  x86-64: Move sys_ni_syscall stub to common.c
  x86-64: Split X32 syscall table into its own file
  x86: Move max syscall number calculation to syscallhdr.sh
  x86-64: Remove ptregs qualifier from syscall table
  x86: Remove syscall qualifier support
  x86-64: Add __SYSCALL_COMMON()
  x86: Remove ABI prefixes from functions in syscall tables
  x86: Clean up syscall_32.tbl
  x86, syscalls: Rename 32-bit specific syscalls
  x86: Use IA32-specific wrappers for syscalls taking 64-bit arguments
  x86-32: Enable pt_regs based syscalls
  x86: Drop asmlinkage from syscalls
  x86: Remove unneeded includes

 arch/x86/Kconfig                            |   2 +-
 arch/x86/entry/Makefile                     |   1 +
 arch/x86/entry/common.c                     |  18 +-
 arch/x86/entry/syscall_32.c                 |  19 +-
 arch/x86/entry/syscall_64.c                 |  39 +-
 arch/x86/entry/syscall_x32.c                |  29 +
 arch/x86/entry/syscalls/syscall_32.tbl      | 818 ++++++++++----------
 arch/x86/entry/syscalls/syscall_64.tbl      | 740 +++++++++---------
 arch/x86/entry/syscalls/syscallhdr.sh       |   7 +
 arch/x86/entry/syscalls/syscalltbl.sh       |  44 +-
 arch/x86/entry/vdso/vdso32/vclock_gettime.c |   1 +
 arch/x86/ia32/Makefile                      |   2 +-
 arch/x86/include/asm/sighandling.h          |   5 -
 arch/x86/include/asm/syscall.h              |  11 +-
 arch/x86/include/asm/syscall_wrapper.h      | 287 +++----
 arch/x86/include/asm/syscalls.h             |  34 -
 arch/x86/include/asm/unistd.h               |   7 +
 arch/x86/kernel/Makefile                    |   2 +
 arch/x86/kernel/asm-offsets_32.c            |   9 -
 arch/x86/kernel/asm-offsets_64.c            |  36 -
 arch/x86/kernel/ldt.c                       |   1 -
 arch/x86/kernel/process.c                   |   1 -
 arch/x86/kernel/process_32.c                |   1 -
 arch/x86/kernel/process_64.c                |   1 -
 arch/x86/kernel/signal.c                    |   4 +-
 arch/x86/{ia32 => kernel}/sys_ia32.c        | 143 ++--
 arch/x86/kernel/sys_x86_64.c                |   1 -
 arch/x86/um/Makefile                        |   1 +
 arch/x86/um/sys_call_table_32.c             |   6 +-
 arch/x86/um/sys_call_table_64.c             |   9 +-
 arch/x86/um/user-offsets.c                  |  15 -
 31 files changed, 1086 insertions(+), 1208 deletions(-)
 create mode 100644 arch/x86/entry/syscall_x32.c
 rename arch/x86/{ia32 => kernel}/sys_ia32.c (78%)

-- 
2.24.1