From: Arnd Bergmann <arnd@arndb.de>
To: linux-s390@vger.kernel.org,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: linux-kernel@vger.kernel.org, y2038@lists.linaro.org,
Dominik Brodowski <linux@dominikbrodowski.net>,
Mark Rutland <mark.rutland@arm.com>,
Arnd Bergmann <arnd@arndb.de>
Subject: [PATCH 0/5] s390: rework compat wrapper generation
Date: Wed, 16 Jan 2019 14:15:18 +0100 [thread overview]
Message-ID: <20190116131527.2071570-1-arnd@arndb.de> (raw)
Hi Heiko and Martin,
As promised, I gave this a go and changed the SYSCALL_DEFINEx()
infrastructure to always include the wrappers for doing the
31-bit argument conversion on s390 compat mode.
This does three main things:
- The UID16 rework saved a lot of duplicated code, and would
probably make sense by itself, but is also required as
we can no longer call sys_*() functions directly after the
last step.
- Removing the compat_wrapper.c file is of course the main
goal here, in order to remove the need to maintain the
compat_wrapper.c file when new system calls get added.
Unfortunately, this requires adding some complexity in
syscall_wrapper.h, and trades a small reduction in source
code lines for a small increase in binary size for
unused wrappers.
- As an added benefit, the use of syscall_wrapper.h now makes
it easy to change the syscall wrappers so they no longer
see all user space register contents, similar to changes
done in commits fa697140f9a2 ("syscalls/x86: Use 'struct pt_regs'
based syscall calling convention for 64-bit syscalls") and
4378a7d4be30 ("arm64: implement syscall wrappers").
I leave the actual implementation of this for you, if you
want to do it later.
I did not test the changes at runtime, but I looked at the
generated object code, which seems fine here and includes
the same conversions as before.
Arnd
Arnd Bergmann (5):
s390: open-code s390_personality syscall
ipc: introduce ksys_ipc()/compat_ksys_ipc() for s390
s390: use generic UID16 implementation
s390: autogenerate compat syscall wrappers
s390: remove compat_wrapper.c
arch/s390/Kconfig | 2 +
arch/s390/include/asm/syscall_wrapper.h | 136 +++++++++++
arch/s390/include/uapi/asm/posix_types.h | 6 +
arch/s390/kernel/Makefile | 2 +-
arch/s390/kernel/compat_linux.c | 235 +------------------
arch/s390/kernel/compat_wrapper.c | 186 ---------------
arch/s390/kernel/entry.S | 4 +-
arch/s390/kernel/sys_s390.c | 14 +-
arch/s390/kernel/syscalls/syscall.tbl | 286 +++++++++++------------
include/linux/syscalls.h | 4 +
ipc/syscall.c | 20 +-
11 files changed, 322 insertions(+), 573 deletions(-)
create mode 100644 arch/s390/include/asm/syscall_wrapper.h
delete mode 100644 arch/s390/kernel/compat_wrapper.c
--
2.20.0
next reply other threads:[~2019-01-16 13:15 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-16 13:15 Arnd Bergmann [this message]
2019-01-16 13:15 ` [PATCH 1/5] s390: open-code s390_personality syscall Arnd Bergmann
2019-01-16 13:15 ` [PATCH 2/5] ipc: introduce ksys_ipc()/compat_ksys_ipc() for s390 Arnd Bergmann
2019-01-17 13:29 ` Heiko Carstens
2019-01-17 16:29 ` Arnd Bergmann
2019-01-17 20:13 ` Heiko Carstens
2019-01-16 13:15 ` [PATCH 3/5] s390: use generic UID16 implementation Arnd Bergmann
2019-01-16 13:15 ` [PATCH 4/5] s390: autogenerate compat syscall wrappers Arnd Bergmann
2019-01-17 13:31 ` Heiko Carstens
2019-01-17 16:23 ` Arnd Bergmann
2019-01-21 9:43 ` Heiko Carstens
2019-01-16 13:15 ` [PATCH 5/5] s390: remove compat_wrapper.c Arnd Bergmann
2019-01-16 15:12 ` [PATCH 0/5] s390: rework compat wrapper generation Heiko Carstens
2019-01-17 13:36 ` Heiko Carstens
2019-01-17 16:21 ` Arnd Bergmann
2019-01-17 20:19 ` Heiko Carstens
2019-01-18 8:48 ` Martin Schwidefsky
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