This is a note to let you know that I've just added the patch titled
openrisc: Properly store r31 to pt_regs on unhandled exceptions
to the 5.15-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:
openrisc-properly-store-r31-to-pt_regs-on-unhandled-.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 287c8d027903e48e3770bb0a5f8c4b2495e78d0e
Author: Stafford Horne <shorne@xxxxxxxxx>
Date: Sat Feb 11 19:14:06 2023 +0900
openrisc: Properly store r31 to pt_regs on unhandled exceptions
[ Upstream commit 812489ac4dd91144a74ce65ecf232252a2e406fb ]
In commit 91993c8c2ed5 ("openrisc: use shadow registers to save regs on
exception") the unhandled exception path was changed to do an early
store of r30 instead of r31. The entry code was not updated and r31 is
not getting stored to pt_regs.
This patch updates the entry handler to store r31 instead of r30. We
also remove some misleading commented out store r30 and r31
instructrions.
I noticed this while working on adding floating point exception
handling, This issue probably would never impact anything since we kill
the process or Oops right away on unhandled exceptions.
Fixes: 91993c8c2ed5 ("openrisc: use shadow registers to save regs on exception")
Signed-off-by: Stafford Horne <shorne@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/openrisc/kernel/entry.S b/arch/openrisc/kernel/entry.S
index c68f3349c1741..d32906e89aafd 100644
--- a/arch/openrisc/kernel/entry.S
+++ b/arch/openrisc/kernel/entry.S
@@ -173,7 +173,6 @@ handler: ;\
l.sw PT_GPR28(r1),r28 ;\
l.sw PT_GPR29(r1),r29 ;\
/* r30 already save */ ;\
-/* l.sw PT_GPR30(r1),r30*/ ;\
l.sw PT_GPR31(r1),r31 ;\
TRACE_IRQS_OFF_ENTRY ;\
/* Store -1 in orig_gpr11 for non-syscall exceptions */ ;\
@@ -211,9 +210,8 @@ handler: ;\
l.sw PT_GPR27(r1),r27 ;\
l.sw PT_GPR28(r1),r28 ;\
l.sw PT_GPR29(r1),r29 ;\
- /* r31 already saved */ ;\
- l.sw PT_GPR30(r1),r30 ;\
-/* l.sw PT_GPR31(r1),r31 */ ;\
+ /* r30 already saved */ ;\
+ l.sw PT_GPR31(r1),r31 ;\
/* Store -1 in orig_gpr11 for non-syscall exceptions */ ;\
l.addi r30,r0,-1 ;\
l.sw PT_ORIG_GPR11(r1),r30 ;\
