Unverified Commit 0a9f2a61 authored Apr 27, 2020 by Andreas Schwab Committed by Palmer Dabbelt May 04, 2020

riscv: add Linux note to vdso



The Linux note in the vdso allows glibc to check the running kernel
version without having to issue the uname syscall.

Signed-off-by: Andreas Schwab <schwab@suse.de>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>

parent c749bb2d

arch/riscv/kernel/vdso/Makefile

+1 −1

Original line number	Diff line number	Diff line
		@@ -12,7 +12,7 @@ vdso-syms += getcpu
		vdso-syms += flush_icache

		# Files to link into the vdso
		obj-vdso = $(patsubst %, %.o, $(vdso-syms))
		obj-vdso = $(patsubst %, %.o, $(vdso-syms)) note.o

		# Build rules
		targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.lds vdso-dummy.o

arch/riscv/kernel/vdso/note.S

0 → 100644

+12 −0

Original line number	Diff line number	Diff line
		/* SPDX-License-Identifier: GPL-2.0-or-later */
		/*
		* This supplies .note.* sections to go into the PT_NOTE inside the vDSO text.
		* Here we can supply some information useful to userland.
		*/

		#include <linux/elfnote.h>
		#include <linux/version.h>

		ELFNOTE_START(Linux, 0, "a")
		.long LINUX_VERSION_CODE
		ELFNOTE_END