From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v6 09/20] arm64:ilp32: share HWCAP between LP64 and ILP32
Date: Thu, 17 Dec 2015 14:56:24 +0100 [thread overview]
Message-ID: <9201094.hyFNZIqCTY@wuerfel> (raw)
In-Reply-To: <20151217105445.GA25232@e104818-lin.cambridge.arm.com>
On Thursday 17 December 2015 10:54:47 Catalin Marinas wrote:
> > > IIUC, we may have a problem with this. elf_hwcap is 64-bit long while
> > > elf_info[n] is 32-bit (Elf32_Addr), so we truncate AT_HWCAP if we ever
> > > go beyond bit 31. The above may need to look something like:
> > >
> > > #define COMPAT_ELF_HWCAP \
> > > (is_a32_compat_task() \
> > > ? compat_elf_hwcap \
> > > : (u32)elf_hwcap)
> > >
> > > #define COMPAT_ELF_HWCAP2 \
> > > (is_a32_compat_task() \
> > > ? compat_elf_hwcap2 \
> > > : (u32)(elf_hwcap >> 32))
> >
> > Yes, interesting find.
>
> BTW, we need to make sure this series (primarily the ABI) is big-endian
> safe. I know it is not targeted at this initially but given that the
> reason for doing it is legacy networking code, I wouldn't be surprised
> if someone asks for BE at some point in the future.
Yes, I'm sure that will be needed.
Arnd
next prev parent reply other threads:[~2015-12-17 13:56 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-15 21:42 [RFC3 PATCH v6 00/20] ILP32 for ARM64 Yury Norov
2015-12-15 21:42 ` [PATCH v6 01/20] arm64: ilp32: add documentation on the ILP32 ABI " Yury Norov
2015-12-15 21:42 ` [PATCH v6 02/20] arm64: ensure the kernel is compiled for LP64 Yury Norov
2015-12-15 21:42 ` [PATCH v6 03/20] arm64: rename COMPAT to AARCH32_EL0 in Kconfig Yury Norov
2015-12-17 11:23 ` Catalin Marinas
2015-12-15 21:42 ` [PATCH v6 04/20] arm64: change some CONFIG_COMPAT over to use CONFIG_AARCH32_EL0 instead Yury Norov
2015-12-23 14:15 ` Yury Norov
2015-12-28 8:43 ` > diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile Bamvor Jian Zhang
2015-12-28 9:01 ` [PATCH v6 04/20] arm64: change some CONFIG_COMPAT over to use CONFIG_AARCH32_EL0 instead Zhangjian (Bamvor)
2015-12-29 12:27 ` Yury Norov
2015-12-29 14:59 ` [PATCH] arm64: compat: fix wrong dependency Bamvor Jian Zhang
2015-12-29 13:12 ` [PATCH v6 04/20] arm64: change some CONFIG_COMPAT over to use CONFIG_AARCH32_EL0 instead Yury Norov
2015-12-15 21:42 ` [PATCH v6 05/20] arm64:uapi: set __BITS_PER_LONG correctly for ILP32 and LP64 Yury Norov
2015-12-15 21:42 ` [PATCH v6 06/20] thread: move thread bits accessors to separated file Yury Norov
2015-12-15 21:42 ` [PATCH v6 07/20] arm64: introduce is_a32_task and is_a32_thread (for AArch32 compat) Yury Norov
2015-12-17 11:38 ` Catalin Marinas
2015-12-15 21:42 ` [PATCH v6 08/20] arm64: ilp32: add is_ilp32_compat_{task, thread} and TIF_32BIT_AARCH64 Yury Norov
2015-12-17 11:41 ` Catalin Marinas
2015-12-18 14:11 ` Yury Norov
2015-12-18 14:44 ` Yury Norov
2015-12-21 17:42 ` Catalin Marinas
2015-12-15 21:42 ` [PATCH v6 09/20] arm64:ilp32: share HWCAP between LP64 and ILP32 Yury Norov
2015-12-16 15:54 ` Arnd Bergmann
2015-12-16 16:58 ` Catalin Marinas
2015-12-16 17:19 ` Catalin Marinas
2015-12-16 19:17 ` Arnd Bergmann
2015-12-17 10:54 ` Catalin Marinas
2015-12-17 13:56 ` Arnd Bergmann [this message]
2015-12-15 21:42 ` [PATCH v6 10/20] arm64:ilp32 use the native LP64 'start_thread' for ILP32 threads Yury Norov
2015-12-16 15:50 ` Arnd Bergmann
2015-12-18 13:57 ` Yury Norov
2015-12-15 21:42 ` [PATCH v6 11/20] arm64:ilp32: support core dump generation for ILP32 Yury Norov
2015-12-17 14:05 ` Catalin Marinas
2015-12-15 21:42 ` [PATCH v6 12/20] arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it Yury Norov
2015-12-16 16:07 ` Arnd Bergmann
2015-12-17 18:27 ` Catalin Marinas
2015-12-17 20:10 ` Arnd Bergmann
2015-12-17 20:14 ` Andrew Pinski
2015-12-17 20:50 ` Arnd Bergmann
2016-01-05 15:26 ` Yury Norov
2016-01-05 21:12 ` Arnd Bergmann
2016-01-06 17:10 ` Catalin Marinas
2016-01-07 14:13 ` Arnd Bergmann
2016-01-07 15:42 ` Yury Norov
2016-01-07 17:23 ` Catalin Marinas
2015-12-18 11:42 ` Catalin Marinas
2015-12-18 12:47 ` Arnd Bergmann
2015-12-21 18:31 ` Catalin Marinas
2015-12-21 22:19 ` Arnd Bergmann
2015-12-21 18:39 ` Dr. Philipp Tomsich
2015-12-21 22:13 ` Arnd Bergmann
2015-12-21 22:31 ` Arnd Bergmann
2015-12-23 18:31 ` Yury Norov
2015-12-23 21:48 ` Arnd Bergmann
2015-12-15 21:42 ` [PATCH v6 13/20] arm64: ilp32: share aarch32 syscall wrappers to ilp32 Yury Norov
2015-12-17 14:38 ` Andreas Schwab
2015-12-18 13:49 ` Yury Norov
2015-12-22 12:25 ` Catalin Marinas
2015-12-22 21:44 ` Arnd Bergmann
2015-12-23 13:37 ` Catalin Marinas
2015-12-23 20:41 ` Arnd Bergmann
2015-12-30 17:29 ` Yury Norov
2015-12-30 22:36 ` Arnd Bergmann
2015-12-23 4:21 ` Yury Norov
2015-12-15 21:42 ` [PATCH v6 14/20] arm64: signal: wrap struct ucontext, fp and lr with struct sigframe Yury Norov
2015-12-15 21:42 ` [PATCH v6 15/20] arm64: signal: move ilp32 and lp64 common code to separated file Yury Norov
2015-12-16 16:08 ` Arnd Bergmann
2015-12-18 13:48 ` Yury Norov
2015-12-18 14:09 ` Arnd Bergmann
2015-12-22 17:11 ` Catalin Marinas
2015-12-15 21:42 ` [PATCH v6 16/20] arm64: signal32: move ilp32 and aarch32 " Yury Norov
2015-12-22 14:29 ` Catalin Marinas
2015-12-15 21:42 ` [PATCH v6 17/20] arm64: ilp32: introduce ilp32-specific handlers for sigframe Yury Norov
2015-12-22 17:08 ` Catalin Marinas
2015-12-15 21:42 ` [PATCH v6 18/20] arm64:ilp32: add vdso-ilp32 and use for signal return Yury Norov
2015-12-15 21:42 ` [PATCH v6 19/20] arm64:ilp32: change COMPAT_ELF_PLATFORM to report a a subplatform for ILP32 Yury Norov
2015-12-15 21:42 ` [PATCH v6 20/20] arm64:ilp32: add ARM64_ILP32 to Kconfig Yury Norov
2015-12-16 16:24 ` [RFC3 PATCH v6 00/20] ILP32 for ARM64 Arnd Bergmann
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