This is a note to let you know that I've just added the patch titled
MIPS: mipsregs.h: Add write_32bit_cp1_register()
to the 3.18-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:
mips-mipsregs.h-add-write_32bit_cp1_register.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 5e32033e14ca9c7f7341cb383f5a05699b0b5382 Mon Sep 17 00:00:00 2001
From: James Hogan <james.hogan@xxxxxxxxxx>
Date: Fri, 30 Jan 2015 15:40:19 +0000
Subject: MIPS: mipsregs.h: Add write_32bit_cp1_register()
From: James Hogan <james.hogan@xxxxxxxxxx>
commit 5e32033e14ca9c7f7341cb383f5a05699b0b5382 upstream.
Add a write_32bit_cp1_register() macro to compliment the
read_32bit_cp1_register() macro. This is to abstract whether .set
hardfloat needs to be used based on GAS_HAS_SET_HARDFLOAT.
The implementation of _read_32bit_cp1_register() .sets mips1 due to
failure of gas v2.19 to assemble cfc1 for Octeon (see commit
25c300030016 ("MIPS: Override assembler target architecture for
octeon.")). I haven't copied this over to _write_32bit_cp1_register() as
I'm uncertain whether it applies to ctc1 too, or whether anybody cares
about that version of binutils any longer.
Signed-off-by: James Hogan <james.hogan@xxxxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: Paul Burton <paul.burton@xxxxxxxxxx>
Cc: David Daney <david.daney@xxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Patchwork: https://patchwork.linux-mips.org/patch/9172/
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/mips/include/asm/mipsregs.h | 15 +++++++++++++++
1 file changed, 15 insertions(+)
--- a/arch/mips/include/asm/mipsregs.h
+++ b/arch/mips/include/asm/mipsregs.h
@@ -1343,12 +1343,27 @@ do { \
__res; \
})
+#define _write_32bit_cp1_register(dest, val, gas_hardfloat) \
+do { \
+ __asm__ __volatile__( \
+ " .set push \n" \
+ " .set reorder \n" \
+ " "STR(gas_hardfloat)" \n" \
+ " ctc1 %0,"STR(dest)" \n" \
+ " .set pop \n" \
+ : : "r" (val)); \
+} while (0)
+
#ifdef GAS_HAS_SET_HARDFLOAT
#define read_32bit_cp1_register(source) \
_read_32bit_cp1_register(source, .set hardfloat)
+#define write_32bit_cp1_register(dest, val) \
+ _write_32bit_cp1_register(dest, val, .set hardfloat)
#else
#define read_32bit_cp1_register(source) \
_read_32bit_cp1_register(source, )
+#define write_32bit_cp1_register(dest, val) \
+ _write_32bit_cp1_register(dest, val, )
#endif
#ifdef HAVE_AS_DSP
Patches currently in stable-queue which might be from james.hogan@xxxxxxxxxx are
queue-3.18/mips-mipsregs.h-add-write_32bit_cp1_register.patch
queue-3.18/mips-traps-fix-inline-asm-ctc1-missing-.set-hardfloat.patch
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