iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

riscv: add Linux note to vdso

Browse Source 
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>
This commit is contained in:
Andreas Schwab 2020-04-27 17:13:34 +02:00 committed by Palmer Dabbelt
parent c749bb2d55
commit 0a9f2a6161
No known key found for this signature in database
GPG Key ID: 2E1319F35FBB1889
2 changed files with 13 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/riscv/kernel/vdso/Makefile
View File

@ -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

12
arch/riscv/kernel/vdso/note.S Normal file
View File

@ -0,0 +1,12 @@
/* 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