This is a note to let you know that I've just added the patch titled
parisc: document the shadow registers
to the 3.10-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-document-the-shadow-registers.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From a83f58bcb24003b9de2364de7c829a263423ead7 Mon Sep 17 00:00:00 2001
From: Helge Deller <[email protected]>
Date: Sat, 29 Jun 2013 13:24:16 +0200
Subject: parisc: document the shadow registers
From: Helge Deller <[email protected]>
commit a83f58bcb24003b9de2364de7c829a263423ead7 upstream.
Signed-off-by: Helge Deller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
Documentation/parisc/registers | 8 ++++++++
1 file changed, 8 insertions(+)
--- a/Documentation/parisc/registers
+++ b/Documentation/parisc/registers
@@ -78,6 +78,14 @@ Shadow Registers used by interruption h
TOC enable bit 1
=========================================================================
+
+The PA-RISC architecture defines 7 registers as "shadow registers".
+Those are used in RETURN FROM INTERRUPTION AND RESTORE instruction to reduce
+the state save and restore time by eliminating the need for general register
+(GR) saves and restores in interruption handlers.
+Shadow registers are the GRs 1, 8, 9, 16, 17, 24, and 25.
+
+=========================================================================
Register usage notes, originally from John Marvin, with some additional
notes from Randolph Chung.
Patches currently in stable-queue which might be from [email protected] are
queue-3.10/parisc-document-the-shadow-registers.patch
queue-3.10/parisc-fix-gcc-miscompilation-in-pa_memcpy.patch
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