This is a note to let you know that I have just added a patch titled
MIPS: cp1emu: Fix ISA restrictions for cop1x_op instructions
to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree
which can be found at:
http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.16.y-queue
This patch is scheduled to be released in version 3.16.7-ckt1.
If you, or anyone else, feels it should not be added to this tree, please
reply to this email.
For more information about the 3.16.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable
Thanks.
-Luis
------
>From 28058a0bd10dec2faecaac290097813f70cc3b22 Mon Sep 17 00:00:00 2001
From: Markos Chandras <markos.chandras@xxxxxxxxxx>
Date: Tue, 21 Oct 2014 10:21:54 +0100
Subject: MIPS: cp1emu: Fix ISA restrictions for cop1x_op instructions
commit a5466d7bba9af83a82cc7c081b2a7d557cde3204 upstream.
Commit 08a07904e1828 ("MIPS: math-emu: Remove most ifdefery") removed
the #ifdef ISA conditions and switched to runtime detection. However,
according to the instruction set manual, the cop1x_op instructions are
available in >=MIPS32r2 as well. This fixes a problem on MIPS32r2
with the ntpd package which failed to execute with a SIGILL exit code due
to the fact that a madd.d instruction was not being emulated.
Signed-off-by: Markos Chandras <markos.chandras@xxxxxxxxxx>
Fixes: 08a07904e1828 ("MIPS: math-emu: Remove most ifdefery")
Cc: linux-mips@xxxxxxxxxxxxxx
Reviewed-by: Paul Burton <paul.burton@xxxxxxxxxx>
Reviewed-by: James Hogan <james.hogan@xxxxxxxxxx>
Cc: Markos Chandras <markos.chandras@xxxxxxxxxx>
Patchwork: https://patchwork.linux-mips.org/patch/8173/
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
arch/mips/math-emu/cp1emu.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c
index 7a4727795a70..51a0fde4bec1 100644
--- a/arch/mips/math-emu/cp1emu.c
+++ b/arch/mips/math-emu/cp1emu.c
@@ -1023,7 +1023,7 @@ emul:
goto emul;
case cop1x_op:
- if (cpu_has_mips_4_5 || cpu_has_mips64)
+ if (cpu_has_mips_4_5 || cpu_has_mips64 || cpu_has_mips32r2)
/* its one of ours */
goto emul;
@@ -1068,7 +1068,7 @@ emul:
break;
case cop1x_op:
- if (!cpu_has_mips_4_5 && !cpu_has_mips64)
+ if (!cpu_has_mips_4_5 && !cpu_has_mips64 && !cpu_has_mips32r2)
return SIGILL;
sig = fpux_emu(xcp, ctx, ir, fault_addr);
--
2.1.0
