This is a note to let you know that I've just added the patch titled
parisc: Fix argument pointer in real64_call_asm()
to the 4.19-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:
parisc-fix-argument-pointer-in-real64_call_asm.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6e3220ba3323a2c24be834aebf5d6e9f89d0993f Mon Sep 17 00:00:00 2001
From: Helge Deller <deller@xxxxxx>
Date: Wed, 3 May 2023 16:39:56 +0200
Subject: parisc: Fix argument pointer in real64_call_asm()
From: Helge Deller <deller@xxxxxx>
commit 6e3220ba3323a2c24be834aebf5d6e9f89d0993f upstream.
Fix the argument pointer (ap) to point to real-mode memory
instead of virtual memory.
It's interesting that this issue hasn't shown up earlier, as this could
have happened with any 64-bit PDC ROM code.
I just noticed it because I suddenly faced a HPMC while trying to execute
the 64-bit STI ROM code of an Visualize-FXe graphics card for the STI
text console.
Signed-off-by: Helge Deller <deller@xxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/parisc/kernel/real2.S | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
--- a/arch/parisc/kernel/real2.S
+++ b/arch/parisc/kernel/real2.S
@@ -248,9 +248,6 @@ ENTRY_CFI(real64_call_asm)
/* save fn */
copy %arg2, %r31
- /* set up the new ap */
- ldo 64(%arg1), %r29
-
/* load up the arg registers from the saved arg area */
/* 32-bit calling convention passes first 4 args in registers */
ldd 0*REG_SZ(%arg1), %arg0 /* note overwriting arg0 */
@@ -262,7 +259,9 @@ ENTRY_CFI(real64_call_asm)
ldd 7*REG_SZ(%arg1), %r19
ldd 1*REG_SZ(%arg1), %arg1 /* do this one last! */
+ /* set up real-mode stack and real-mode ap */
tophys_r1 %sp
+ ldo -16(%sp), %r29 /* Reference param save area */
b,l rfi_virt2real,%r2
nop
Patches currently in stable-queue which might be from deller@xxxxxx are
queue-4.19/parisc-fix-argument-pointer-in-real64_call_asm.patch
