This is a note to let you know that I've just added the patch titled
MIPS: traps: Fix inline asm ctc1 missing .set hardfloat
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-traps-fix-inline-asm-ctc1-missing-.set-hardfloat.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 d76e9b9fc5de7e8fc4fd0e72a94e8c723929ffea Mon Sep 17 00:00:00 2001
From: James Hogan <james.hogan@xxxxxxxxxx>
Date: Fri, 30 Jan 2015 15:40:20 +0000
Subject: MIPS: traps: Fix inline asm ctc1 missing .set hardfloat
From: James Hogan <james.hogan@xxxxxxxxxx>
commit d76e9b9fc5de7e8fc4fd0e72a94e8c723929ffea upstream.
Commit 842dfc11ea9a ("MIPS: Fix build with binutils 2.24.51+") in v3.18
enabled -msoft-float and sprinkled ".set hardfloat" where necessary to
use FP instructions. However it missed enable_restore_fp_context() which
since v3.17 does a ctc1 with inline assembly, causing the following
assembler errors on Mentor's 2014.05 toolchain:
{standard input}: Assembler messages:
{standard input}:2913: Error: opcode not supported on this processor: mips32r2 (mips32r2) `ctc1 $2,$31'
scripts/Makefile.build:257: recipe for target 'arch/mips/kernel/traps.o' failed
Fix that to use the new write_32bit_cp1_register() macro so that ".set
hardfloat" is automatically added when -msoft-float is in use.
Fixes 842dfc11ea9a ("MIPS: Fix build with binutils 2.24.51+")
Signed-off-by: James Hogan <james.hogan@xxxxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: Paul Burton <paul.burton@xxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Patchwork: https://patchwork.linux-mips.org/patch/9173/
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/mips/kernel/traps.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -1184,7 +1184,8 @@ static int enable_restore_fp_context(int
/* Restore the scalar FP control & status register */
if (!was_fpu_owner)
- asm volatile("ctc1 %0, $31" : : "r"(current->thread.fpu.fcr31));
+ write_32bit_cp1_register(CP1_STATUS,
+ current->thread.fpu.fcr31);
}
out:
Patches currently in stable-queue which might be from james.hogan@xxxxxxxxxx are
queue-3.18/mips-traps-fix-inline-asm-ctc1-missing-.set-hardfloat.patch
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