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From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v9 00/24] ILP32 for ARM64
Date: Wed, 10 Oct 2018 16:18:02 +0200	[thread overview]
Message-ID: <CAK8P3a2svZe6FHoNzjkizwwDZfRQ4Y7qpX0y4m6T56uo8n4gVQ@mail.gmail.com> (raw)
In-Reply-To: <20181010141017.GA2881@asgard.redhat.com>

On 10/10/18, Eugene Syromiatnikov <esyr@redhat.com> wrote:
> On Tue, Jul 24, 2018 at 08:39:57PM +0300, Yury Norov wrote:
>> Hi all,
>>
>> + Pavel Machek, Palmer Dabbelt, Wookey.
>>
>> On Wed, May 16, 2018 at 11:18:45AM +0300, Yury Norov wrote:
>> > This series enables AARCH64 with ILP32 mode.
>> >
>> > As supporting work, it introduces ARCH_32BIT_OFF_T configuration
>> > option that is enabled for existing 32-bit architectures but disabled
>> > for new arches (so 64-bit off_t userspace type is used by new
>> > userspace).
>> > Also it deprecates getrlimit and setrlimit syscalls prior to prlimit64.
>> >
>> > Based on kernel v4.16. Tested with LTP, glibc testsuite, trinity,
>> > lmbench,
>> > CPUSpec.
>
>> This is the update of the series based on 4.17 kernel
>> https://github.com/norov/linux/tree/ilp32-4.17
>
> Hello.
>
> I have some questions regarding AArch64 ILP32 implementation for which I
> failed to find an answer myself:
>  * How ptrace() tracer is supposed to distinguish between ILP32 and LP64
>    tracees? For MIPS N32 and x32 this is possible based on syscall
>    number, but for AArch64 ILP32 I do not see such a sign. There's also
>    ARM_ip is employed for signalling entering/exiting, I wonder whether
>    it's possible to employ it also for signalling tracee's personality.

Don't know.

>  * What's the reasoning behind capping syscall arguments to 32 bit? x32
>    and MIPS N32 do not have such a restriction (and do not need special
>    wrappers for syscalls that pass 64-bit values as a result, except
>    when they do,  as it is the case for preadv2 on x32); moreover, that
>    would lead to insurmountable difficulties for AArch64 ILP32 tracers
>    that try to trace LP64 tracees, as it would be impossible to pass
>    64-bit addresses to process_vm_{read,write} or ptrace PEEK/POKE.

The idea is to keep the syscall entry points as similar as possible
between arm (aarch32) emulation and aarch64-ilp32 mode when
you have a kernel that supports both.

      Arnd

  reply	other threads:[~2018-10-10 14:18 UTC|newest]

Thread overview: 73+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-16  8:18 [PATCH v9 00/24] ILP32 for ARM64 Yury Norov
2018-05-16  8:18 ` [PATCH 01/24] arm64: signal: Make parse_user_sigframe() independent of rt_sigframe layout Yury Norov
2018-05-16  8:18 ` [PATCH 02/24] ptrace: Add compat PTRACE_{G,S}ETSIGMASK handlers Yury Norov
2018-05-16  8:18 ` [PATCH 03/24] compat ABI: use non-compat openat and open_by_handle_at variants Yury Norov
2018-05-16  8:18 ` [PATCH 04/24] 32-bit userspace ABI: introduce ARCH_32BIT_OFF_T config option Yury Norov
2018-06-08 17:32   ` Catalin Marinas
2018-06-08 22:33     ` Palmer Dabbelt
2018-06-09  7:43       ` Yury Norov
2018-06-09 21:13       ` Adam Borowski
2018-06-09  7:42     ` Yury Norov
2018-06-11  7:48       ` Arnd Bergmann
2018-06-11 11:27         ` Yury Norov
2018-06-25  6:19           ` Yury Norov
2018-08-02 18:30             ` Palmer Dabbelt
2018-05-16  8:18 ` [PATCH 06/24] thread: move thread bits accessors to separated file Yury Norov
2018-05-16  8:18 ` [PATCH 07/24] arm64: ilp32: add documentation on the ILP32 ABI for ARM64 Yury Norov
2018-05-23 14:06   ` Pavel Machek
2018-05-24 12:15     ` Yury Norov
2018-05-24 12:24       ` Dr. Philipp Tomsich
2018-05-16  8:18 ` [PATCH 08/24] arm64: rename COMPAT to AARCH32_EL0 in Kconfig Yury Norov
2018-05-16  8:18 ` [PATCH 09/24] arm64: rename functions that reference compat term Yury Norov
2018-05-16  8:18 ` [PATCH 10/24] arm64: uapi: set __BITS_PER_LONG correctly for ILP32 and LP64 Yury Norov
2018-05-16  8:18 ` [PATCH 11/24] arm64: introduce is_a32_task and is_a32_thread (for AArch32 compat) Yury Norov
2018-05-16  8:18 ` [PATCH 12/24] arm64: ilp32: add is_ilp32_compat_{task, thread} and TIF_32BIT_AARCH64 Yury Norov
2018-05-16  8:18 ` [PATCH 13/24] arm64: introduce binfmt_elf32.c Yury Norov
2018-05-16  8:18 ` [PATCH 14/24] arm64: change compat_elf_hwcap and compat_elf_hwcap2 prefix to a32 Yury Norov
2018-05-16  8:19 ` [PATCH 15/24] arm64: ilp32: introduce binfmt_ilp32.c Yury Norov
2018-05-16  8:19 ` [PATCH 16/24] arm64: ilp32: share aarch32 syscall handlers Yury Norov
2018-05-16  8:19 ` [PATCH 17/24] arm64: ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it Yury Norov
2018-05-16  8:19 ` [PATCH 18/24] arm64: signal: share lp64 signal structures and routines to ilp32 Yury Norov
2018-05-16  8:19 ` [PATCH 19/24] arm64: signal32: move ilp32 and aarch32 common code to separated file Yury Norov
2018-05-16  8:19 ` [PATCH 20/24] arm64: ilp32: introduce ilp32-specific sigframe and ucontext Yury Norov
2018-05-16  8:19 ` [PATCH 21/24] arm64: ptrace: handle ptrace_request differently for aarch32 and ilp32 Yury Norov
2018-05-16  8:19 ` [PATCH 22/24] arm64:ilp32: add vdso-ilp32 and use for signal return Yury Norov
2019-09-30  7:24   ` Andreas Schwab
2018-05-16  8:19 ` [PATCH 23/24] arm64:ilp32: add ARM64_ILP32 to Kconfig Yury Norov
2018-05-16  8:19 ` [PATCH 24/24] arm64: ilp32: Make the Kconfig option default y Yury Norov
2018-07-24 17:39 ` [PATCH v9 00/24] ILP32 for ARM64 Yury Norov
2018-07-25  9:48   ` Andreas Schwab
2018-10-10 14:10   ` Eugene Syromiatnikov
2018-10-10 14:18     ` Arnd Bergmann [this message]
2018-10-10 14:39     ` Szabolcs Nagy
2018-10-13  2:07       ` Eugene Syromiatnikov
2018-10-13  9:20         ` Catalin Marinas
2018-10-14 19:53         ` Arnd Bergmann
2018-10-10 15:36     ` Catalin Marinas
2018-10-13  2:14       ` Eugene Syromiatnikov
2018-10-13  9:34         ` Catalin Marinas
2018-10-13 13:43           ` Yury Norov
2018-10-13 16:54           ` Andy Lutomirski
2018-11-13 10:04   ` Andreas Schwab
2018-11-13 10:57     ` Yury Norov
2018-11-15  0:51       ` Catalin Marinas
2018-11-15  8:54         ` Andreas Schwab
2018-11-15 20:27           ` Yury Norov
2018-11-19  9:57             ` Andreas Schwab
2018-10-13 19:36 ` Andy Lutomirski
2018-10-14 19:49   ` Arnd Bergmann
2018-10-18 11:14     ` Catalin Marinas
2018-11-19 21:29 ` Yury Norov
2019-01-07 15:50 ` Yuri Norov
     [not found]   ` <DC9A951E-B638-4820-8499-02D5322E7DF7@amacapital.net>
2019-01-07 20:43     ` Yuri Norov
2019-01-08 21:18   ` [PATCH] arm64: introduce AUDIT_ARCH_AARCH64ILP32 for ilp32 Yuri Norov
2019-03-05 20:56 ` [PATCH v9 00/24] ILP32 for ARM64 Yury Norov
2019-05-08 22:59 ` Yury Norov
2019-05-08 23:10   ` Yury Norov
2019-05-13  8:48   ` Andreas Schwab
2019-05-13 20:16     ` [EXT] " Yuri Norov
     [not found]       ` <20190514104311.GA24708@rei>
2019-05-14 23:01         ` [LTP] " Yury Norov
2019-05-14 23:41         ` Yury Norov
2019-07-09 22:42 ` Yury Norov
  -- strict thread matches above, loose matches on Subject: below --
2018-05-15 19:11 Yury Norov
2018-05-15 19:40 ` Yury Norov

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