This is a note to let you know that I've just added the patch titled
ARCv2: save r30 on kernel entry as gcc uses it for code-gen
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arcv2-save-r30-on-kernel-entry-as-gcc-uses-it-for-code-gen.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ecd43afdbe72017aefe48080631eb625e177ef4d Mon Sep 17 00:00:00 2001
From: Vineet Gupta <vgupta@xxxxxxxxxxxx>
Date: Sun, 8 Jan 2017 19:45:48 -0800
Subject: ARCv2: save r30 on kernel entry as gcc uses it for code-gen
From: Vineet Gupta <vgupta@xxxxxxxxxxxx>
commit ecd43afdbe72017aefe48080631eb625e177ef4d upstream.
This is not exposed to userspace debugers yet, which can be done
independently as a seperate patch !
Signed-off-by: Vineet Gupta <vgupta@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arc/include/asm/entry-arcv2.h | 2 ++
arch/arc/include/asm/ptrace.h | 2 +-
2 files changed, 3 insertions(+), 1 deletion(-)
--- a/arch/arc/include/asm/entry-arcv2.h
+++ b/arch/arc/include/asm/entry-arcv2.h
@@ -16,6 +16,7 @@
;
; Now manually save: r12, sp, fp, gp, r25
+ PUSH r30
PUSH r12
; Saving pt_regs->sp correctly requires some extra work due to the way
@@ -72,6 +73,7 @@
POPAX AUX_USER_SP
1:
POP r12
+ POP r30
.endm
--- a/arch/arc/include/asm/ptrace.h
+++ b/arch/arc/include/asm/ptrace.h
@@ -84,7 +84,7 @@ struct pt_regs {
unsigned long fp;
unsigned long sp; /* user/kernel sp depending on where we came from */
- unsigned long r12;
+ unsigned long r12, r30;
/*------- Below list auto saved by h/w -----------*/
unsigned long r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11;
Patches currently in stable-queue which might be from vgupta@xxxxxxxxxxxx are
queue-4.9/arc-fix-build-error.patch
queue-4.9/arcv2-save-r30-on-kernel-entry-as-gcc-uses-it-for-code-gen.patch