Patch "parisc: Fix argument pointer in real64_call_asm()" has been added to the 4.19-stable tree

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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



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