This is a note to let you know that I've just added the patch titled
ARM: 9169/1: entry: fix Thumb2 bug in iWMMXt exception handling
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:
arm-9169-1-entry-fix-thumb2-bug-in-iwmmxt-exception-handling.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.
>From 8536a5ef886005bc443c2da9b842d69fd3d7647f Mon Sep 17 00:00:00 2001
From: Ard Biesheuvel <ardb@xxxxxxxxxx>
Date: Wed, 15 Dec 2021 09:31:36 +0100
Subject: ARM: 9169/1: entry: fix Thumb2 bug in iWMMXt exception handling
From: Ard Biesheuvel <ardb@xxxxxxxxxx>
commit 8536a5ef886005bc443c2da9b842d69fd3d7647f upstream.
The Thumb2 version of the FP exception handling entry code treats the
register holding the CP number (R8) differently, resulting in the iWMMXT
CP number check to be incorrect.
Fix this by unifying the ARM and Thumb2 code paths, and switch the
order of the additions of the TI_USED_CP offset and the shifted CP
index.
Cc: <stable@xxxxxxxxxxxxxxx>
Fixes: b86040a59feb ("Thumb-2: Implementation of the unified start-up and exceptions code")
Signed-off-by: Ard Biesheuvel <ardb@xxxxxxxxxx>
Signed-off-by: Russell King (Oracle) <rmk+kernel@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm/kernel/entry-armv.S | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -597,11 +597,9 @@ call_fpe:
tstne r0, #0x04000000 @ bit 26 set on both ARM and Thumb-2
reteq lr
and r8, r0, #0x00000f00 @ mask out CP number
- THUMB( lsr r8, r8, #8 )
mov r7, #1
- add r6, r10, #TI_USED_CP
- ARM( strb r7, [r6, r8, lsr #8] ) @ set appropriate used_cp[]
- THUMB( strb r7, [r6, r8] ) @ set appropriate used_cp[]
+ add r6, r10, r8, lsr #8 @ add used_cp[] array offset first
+ strb r7, [r6, #TI_USED_CP] @ set appropriate used_cp[]
#ifdef CONFIG_IWMMXT
@ Test if we need to give access to iWMMXt coprocessors
ldr r5, [r10, #TI_FLAGS]
@@ -610,7 +608,7 @@ call_fpe:
bcs iwmmxt_task_enable
#endif
ARM( add pc, pc, r8, lsr #6 )
- THUMB( lsl r8, r8, #2 )
+ THUMB( lsr r8, r8, #6 )
THUMB( add pc, r8 )
nop
Patches currently in stable-queue which might be from ardb@xxxxxxxxxx are
queue-5.15/arm-9169-1-entry-fix-thumb2-bug-in-iwmmxt-exception-handling.patch
