9df36878a6
Provide the arm64 compat (AArch32) vDSO in kernel/vdso32 in a similar way to what happens in kernel/vdso. The compat vDSO leverages on an adaptation of the arm architecture code with few changes: - Use of lib/vdso for gettimeofday - Implement a syscall based fallback - Introduce clock_getres() for the compat library - Implement trampolines - Implement elf note To build the compat vDSO a 32 bit compiler is required and needs to be specified via CONFIG_CROSS_COMPILE_COMPAT_VDSO. The code is not yet enabled as other prerequisites are missing. Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Shijith Thotton <sthotton@marvell.com> Tested-by: Andre Przywara <andre.przywara@arm.com> Cc: linux-arch@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-mips@vger.kernel.org Cc: linux-kselftest@vger.kernel.org Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Russell King <linux@armlinux.org.uk> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul Burton <paul.burton@mips.com> Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Mark Salyzyn <salyzyn@android.com> Cc: Peter Collingbourne <pcc@google.com> Cc: Shuah Khan <shuah@kernel.org> Cc: Dmitry Safonov <0x7f454c46@gmail.com> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Huw Davies <huw@codeweavers.com> Link: https://lkml.kernel.org/r/20190621095252.32307-11-vincenzo.frascino@arm.com (cherry picked from commit a7f71a2c8903f8599312f75233946287c558d9f6) [ salyzyn: deal with pre y2038 refactor ] Signed-off-by: Mark Salyzyn <salyzyn@google.com> Bug: 154668398 Change-Id: I8ff63189db76e8833789076417c6e1fc27e0cc96
20 lines
351 B
ArmAsm
20 lines
351 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2012 ARM Limited
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*/
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#include <linux/init.h>
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#include <linux/linkage.h>
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#include <linux/const.h>
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#include <asm/page.h>
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.globl vdso32_start, vdso32_end
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.section .rodata
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.balign PAGE_SIZE
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vdso32_start:
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.incbin "arch/arm64/kernel/vdso32/vdso.so"
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.balign PAGE_SIZE
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vdso32_end:
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.previous
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