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https://github.com/aosp-mirror/kernel_msm/commit/e46ec5f0eb314aeba5e731d6827c9714227266d0
The most significant change in vgettimeofday.c is the use of the arm64 vdso_data struct, allowing the vDSO data page to be shared between the 32 and 64-bit vDSOs. Additionally, a different set of barrier macros is used (see aarch32-barrier.h), as we want to support old 32-bit compilers that may not support ARMv8 and its new barrier arguments (*ld).
next prev parent reply index Thread overview: 110+ messages / expand[flatnested] mbox.gz Atom feed top 2019-06-21 9:52 [PATCH v7 00/25] Unify vDSOs across more architectures Vincenzo Frascino 2019-06-21 9:52 ` [PATCH v7 01/25] kernel: Standardize vdso_datapage Vincenzo Frascino 2019-06-24 13:56 ` Catalin Marinas 2019-06-21 9:52 ` [PATCH v7 02 ...
http://lkml.iu.edu/hypermail/linux/kernel/1402.1/05401.html
This patch add the time support for 32 bit a VDSO to a 32 bit kernel. For 32 bit programs running on a 32 bit kernel, the same mechanism is used as for 64 bit programs running on a 64 bit kernel. ... defined CONFIG_COMPAT + +#include <asm/vdso32.h> + extern const char VDSO32_PRELINK[]; /*
Jul 29, 2019 · [PATCH] arm64: vdso: Fix Makefile regression Vincenzo Frascino Mon, 29 Jul 2019 05:54:49 -0700 Using an old .config in combination with "make oldconfig" can cause an incorrect detection of the compat compiler:
https://blog.linuxplumbersconf.org/2016/ocw/system/presentations/3711/original/LPC_vDSO.pdf
Compat processes and vDSO COMPAT: running 32-bit processes under a 64-bit kernel Present on x86, arm64, mips, powerpc, … Requires dedicated vDSO support Present on x86, mips, powerpc, … but not arm64 Partly due to armonly having a vDSO since 4.1 (glibc support only added in 2.22) Why bother about the performance of 32-bit processes on arm64?
https://github.com/RuRuTiaSaMa/android_kernel_nubia/commits/pe
The compat vDSO Makefile relies on CROSS_COMPILE_ARM32 to provide a 32-bit compiler, appropriate logic will be added to the arm64 Makefile later on to ensure that an attempt to build the compat vDSO is made only if this variable has been set properly.
next prev parent reply index Thread overview: 60+ messages / expand[flatnested] mbox.gz Atom feed top 2019-02-22 12:24 [PATCH v5 00/23] Unify vDSOs across more architectures Vincenzo Frascino 2019-02-22 12:24 ` [PATCH v5 01/23] kernel: Standardize vdso_datapage Vincenzo Frascino 2019-02-22 12:58 ` Mark Rutland 2019-02-23 16:51 ` Thomas ...
https://patchwork.kernel.org/patch/10968853/
https://unix.stackexchange.com/questions/9885/where-is-config-compat-vdso-in-make-menuconfig
Where is CONFIG_COMPAT_VDSO in make menuconfig? Ask Question Asked 8 years, 9 months ago. ... But I'm stumped when I reached the option CONFIG_COMPAT_VDSO. ... Gentoo kernel VDSO. It looks like Gentoo has it disabled even several versions before.
https://github.com/ValveSoftware/steamos_kernel/pull/9/commits/e97d991740cd365bb80b906f738ef57ac16bd1f1
Nov 20, 2014 · x86, vdso: Remove compat vdso support The compat vDSO is a complicated hack that's needed to maintain compatibility with a small range of glibc versions. This removes it and replaces it with a much simpler hack: a config option to disable the 32-bit vDSO by default.
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