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Re: [PATCH 01/23] all: syscall wrappers: add documentation

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From: Yury Norov <ynorov@caviumnetworks.com>
Date: Tue, 24 May 2016 03:04:30 +0300

> +To clear that top halves, automatic wrappers are introduced. They clear all
> +required registers before passing control to regular syscall handler.

Why have one of these for every single compat system call, rather than
simply clearing the top half of all of these registers unconditionally
in the 32-bit system call trap before the system call is invoked?

That's what we do on sparc64.

And with that, you only need wrappers for the case where there needs
to be proper sign extention of a 32-bit signed argument.

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[PATCH v6 00/21] ILP32 for ARM64 Yury Norov <ynorov@caviumnetworks.com> - 2016-05-24 02:20 +0200
  [PATCH 05/23] all: wrap needed syscalls in generic unistd Yury Norov <ynorov@caviumnetworks.com> - 2016-05-24 02:30 +0200
  Re: [PATCH v6 00/21] ILP32 for ARM64 Yury Norov <ynorov@caviumnetworks.com> - 2016-05-25 18:50 +0200
  Re: [PATCH 01/23] all: syscall wrappers: add documentation David Miller <davem@davemloft.net> - 2016-05-25 21:40 +0200
    Re: [PATCH 01/23] all: syscall wrappers: add documentation David Miller <davem@davemloft.net> - 2016-05-25 22:30 +0200
      Re: [PATCH 01/23] all: syscall wrappers: add documentation Arnd Bergmann <arnd@arndb.de> - 2016-05-25 22:50 +0200
        Re: [PATCH 01/23] all: syscall wrappers: add documentation David Miller <davem@davemloft.net> - 2016-05-25 23:00 +0200
          Re: [PATCH 01/23] all: syscall wrappers: add documentation Arnd Bergmann <arnd@arndb.de> - 2016-05-25 23:10 +0200
            Re: [PATCH 01/23] all: syscall wrappers: add documentation David Miller <davem@davemloft.net> - 2016-05-25 23:30 +0200
              Re: [PATCH 01/23] all: syscall wrappers: add documentation Catalin Marinas <catalin.marinas@arm.com> - 2016-05-26 16:30 +0200
                Re: [PATCH 01/23] all: syscall wrappers: add documentation Catalin Marinas <catalin.marinas@arm.com> - 2016-05-26 17:20 +0200
                Re: [PATCH 01/23] all: syscall wrappers: add documentation David Miller <davem@davemloft.net> - 2016-05-26 21:50 +0200
                Re: [PATCH 01/23] all: syscall wrappers: add documentation Catalin Marinas <catalin.marinas@arm.com> - 2016-05-27 12:20 +0200
              Re: [PATCH 01/23] all: syscall wrappers: add documentation Catalin Marinas <catalin.marinas@arm.com> - 2016-05-27 00:40 +0200
                Re: [PATCH 01/23] all: syscall wrappers: add documentation Heiko Carstens <heiko.carstens@de.ibm.com> - 2016-05-27 08:10 +0200
                Re: [PATCH 01/23] all: syscall wrappers: add documentation Arnd Bergmann <arnd@arndb.de> - 2016-05-27 10:50 +0200
                Re: [PATCH 01/23] all: syscall wrappers: add documentation Catalin Marinas <catalin.marinas@arm.com> - 2016-05-27 11:40 +0200
                Re: [PATCH 01/23] all: syscall wrappers: add documentation Arnd Bergmann <arnd@arndb.de> - 2016-05-27 13:00 +0200
                Re: [PATCH 01/23] all: syscall wrappers: add documentation Catalin Marinas <catalin.marinas@arm.com> - 2016-05-27 15:10 +0200
                Re: [PATCH 01/23] all: syscall wrappers: add documentation Catalin Marinas <catalin.marinas@arm.com> - 2016-05-27 19:40 +0200
                Re: [PATCH 01/23] all: syscall wrappers: add documentation Catalin Marinas <catalin.marinas@arm.com> - 2016-05-27 11:10 +0200
    Re: [PATCH 01/23] all: syscall wrappers: add documentation Heiko Carstens <heiko.carstens@de.ibm.com> - 2016-05-27 08:00 +0200
  Re: [PATCH 18/23] arm64: ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it Arnd Bergmann <arnd@arndb.de> - 2016-05-25 22:30 +0200

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