From: luto@amacapital•net (Andy Lutomirski)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCHv3 00/24] ILP32 support in ARM64
Date: Wed, 11 Feb 2015 12:15:56 -0800 [thread overview]
Message-ID: <54DBB87C.5060901@amacapital.net> (raw)
In-Reply-To: <CAMe9rOrVGFcQN3J1-pkXWd9j4MaQv2QxPrA5cTtLPBPaQ2-zfw@mail.gmail.com>
On 02/11/2015 11:57 AM, H.J. Lu wrote:
>>>> trivially satisfied if you consider x32 and x86_64 separate
>>>> compilation environments, but it's not related to the core issue: that
>>>> the definition of timespec violates core (not obscure) requirements of
>>>> both POSIX and C11. At the time you were probably unaware of the C11
>>>> requirement. Note that it's a LOT harder to effect change in the C
>>>> standard, so even if the Austin Group would be amenable to changing
>>>> the requirement for timespec to allow something like nseconds_t,
>>>> getting WG14 to make this change to work around a Linux/glibc mistake
>>>> does not sound practical.
>>>
>>> That is very unfortunate. I consider it is too late for x32 to change.
>>
>> Why? It's hardly an incompatible ABI change, as long as the
>> kernel/libc fills the upper bits (for old programs that read them
>> based on the old headers) when structs are read from the kernel to the
>> application, and ignores the upper bits (potentially set or left
>> uninitialized by the application) when strings are passed from
>> userspace to the kernel. Newly built apps using the struct definition
>> with 32-bit tv_nsec would need new libc to ensure that the high bits
>> aren't interpreted, but this could be handled by symbol versioning.
>>
>
> We have considered this option. But since kernel wouldn't change
> tv_nsec/tv_usec handling just for x32, it wasn't selected.
>
Did anyone *ask* the kernel people (e.g. hpa)?
--Andy
next prev parent reply other threads:[~2015-02-11 20:15 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-03 21:18 [PATCHv3 00/24] ILP32 support in ARM64 Andrew Pinski
2014-09-03 21:18 ` [PATCH 01/24] ARM64: Force LP64 to compile the kernel Andrew Pinski
2014-09-03 21:18 ` [PATCH 02/24] ARM64: Rename COMPAT to AARCH32_EL0 in Kconfig Andrew Pinski
2014-09-03 21:18 ` [PATCH 03/24] ARM64: Change some CONFIG_COMPAT over to use CONFIG_AARCH32_EL0 instead Andrew Pinski
2014-09-03 21:18 ` [PATCH 04/24] ARM64:ILP32: Set kernel_long to long long so we can reuse most of the same syscalls as LP64 Andrew Pinski
2014-09-03 21:18 ` [PATCH 05/24] ARM64:UAPI: Set the correct __BITS_PER_LONG for ILP32 Andrew Pinski
2014-09-03 21:19 ` [PATCH 06/24] Allow for some signal structures to be the same between a 32bit ABI and the 64bit ABI Andrew Pinski
2014-09-03 21:19 ` [PATCH 07/24] ARM64:ILP32: Use the same size and layout of the signal structures for ILP32 as for LP64 Andrew Pinski
2014-09-18 3:41 ` zhangjian
2014-09-03 21:19 ` [PATCH 08/24] Allow a 32bit ABI to use the naming of the 64bit ABI syscalls to avoid confusion of not splitting the registers Andrew Pinski
2014-09-04 10:11 ` Arnd Bergmann
2014-10-01 12:42 ` Catalin Marinas
2014-10-01 14:00 ` Arnd Bergmann
2014-10-02 11:19 ` Catalin Marinas
2014-09-03 21:19 ` [PATCH 09/24] ARM64:ILP32: Use the same syscall names as LP64 Andrew Pinski
2014-10-01 12:48 ` Catalin Marinas
2014-09-03 21:19 ` [PATCH 10/24] ARM64: Introduce is_a32_task/is_a32_thread and TIF_AARCH32 and use them in the correct locations Andrew Pinski
2014-09-03 21:19 ` [PATCH 11/24] ARM64: Add is_ilp32_compat_task and is_ilp32_compat_thread Andrew Pinski
2014-09-03 21:19 ` [PATCH 12/24] ARM64:ILP32: COMPAT_USE_64BIT_TIME is true for ILP32 tasks Andrew Pinski
2014-09-03 21:19 ` [PATCH 13/24] ARM64:ILP32: Use the non compat HWCAP for ILP32 Andrew Pinski
2014-10-01 13:12 ` Catalin Marinas
2014-09-03 21:19 ` [PATCH 14/24] ARM64:ILP32 use the standard start_thread for ILP32 so the processor state is not AARCH32 Andrew Pinski
2014-09-03 21:19 ` [PATCH 15/24] compat_binfmt_elf: coredump: Allow some core dump macros be overridden for compat Andrew Pinski
2014-09-03 21:19 ` [PATCH 16/24] ARM64:ILP32: Support core dump for ILP32 Andrew Pinski
2014-10-01 13:22 ` Catalin Marinas
2014-09-03 21:19 ` [PATCH 17/24] ARM64: Add loading of ILP32 binaries Andrew Pinski
2014-09-03 21:19 ` [PATCH 18/24] ARM64: Add vdso for ILP32 and use it for the signal return Andrew Pinski
2014-09-10 14:31 ` Christopher Covington
2014-10-01 13:59 ` Catalin Marinas
2014-10-02 13:38 ` Catalin Marinas
2014-09-03 21:19 ` [PATCH 19/24] ptrace: Allow compat to use the native siginfo Andrew Pinski
2014-10-02 14:13 ` Catalin Marinas
2014-09-03 21:19 ` [PATCH 20/24] ARM64:ILP32: The native siginfo is used instead of the compat siginfo Andrew Pinski
2014-09-03 21:19 ` [PATCH 21/24] ARM64:ILP32: Use a seperate syscall table as a few syscalls need to be using the compat syscalls Andrew Pinski
2014-10-02 15:23 ` Catalin Marinas
2014-10-02 15:46 ` Catalin Marinas
2014-09-03 21:19 ` [PATCH 22/24] ARM64:ILP32: Fix signal return for ILP32 when the user modified the signal stack Andrew Pinski
2014-09-03 21:19 ` [PATCH 23/24] ARM64: Add ARM64_ILP32 to Kconfig Andrew Pinski
2014-09-03 21:19 ` [PATCH 24/24] Add documentation about ARM64 ILP32 ABI Andrew Pinski
2014-09-04 10:01 ` Arnd Bergmann
2014-10-02 15:52 ` [PATCHv3 00/24] ILP32 support in ARM64 Catalin Marinas
2015-02-10 18:13 ` Rich Felker
2015-02-11 17:39 ` Catalin Marinas
2015-02-11 19:05 ` [musl] " Szabolcs Nagy
2015-02-11 19:22 ` H.J. Lu
2015-02-11 19:50 ` arnd at arndb.de
2015-02-11 20:12 ` Rich Felker
[not found] ` <1383502854.512344.1423688575473.JavaMail.open-xchange@oxbaltgw09.schlund.de>
2015-02-11 21:09 ` arnd at arndb.de
2015-02-11 21:37 ` Rich Felker
2015-02-16 17:20 ` Arnd Bergmann
2015-02-16 17:51 ` Rich Felker
2015-02-16 19:38 ` Arnd Bergmann
2015-02-12 8:12 ` Szabolcs Nagy
2015-02-12 17:07 ` Catalin Marinas
2015-02-11 19:21 ` Rich Felker
2015-02-12 18:17 ` Catalin Marinas
2015-02-12 18:59 ` arnd at arndb.de
2015-02-13 13:33 ` Catalin Marinas
2015-02-13 16:30 ` Rich Felker
2015-02-13 17:33 ` Catalin Marinas
2015-02-13 18:37 ` Rich Felker
2015-02-16 14:40 ` Arnd Bergmann
2015-02-16 15:38 ` Rich Felker
2015-02-16 16:54 ` Arnd Bergmann
2015-02-11 18:33 ` H.J. Lu
2015-02-11 19:02 ` Rich Felker
2015-02-11 19:16 ` H.J. Lu
2015-02-11 19:25 ` Rich Felker
2015-02-11 19:34 ` H.J. Lu
2015-02-11 19:47 ` Rich Felker
2015-02-11 19:57 ` H.J. Lu
2015-02-11 20:15 ` Andy Lutomirski [this message]
2015-02-12 15:50 ` Catalin Marinas
2015-02-12 16:13 ` Rich Felker
2015-02-12 16:30 ` H.J. Lu
2015-02-12 17:00 ` Rich Felker
2015-02-11 21:41 ` Joseph Myers
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