From: Stephen Boyd <sboyd@codeaurora.org>
To: linux-arm-kernel@lists.infradead.org
Cc: Stepan Moskovchenko <stepanm@codeaurora.org>,
linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
Will Deacon <will.deacon@arm.com>
Subject: [PATCH 3/3] arm: vfp: Bounce undefined instructions in vectored mode
Date: Thu, 18 Sep 2014 14:43:12 -0700 [thread overview]
Message-ID: <1411076592-6157-4-git-send-email-sboyd@codeaurora.org> (raw)
In-Reply-To: <1411076592-6157-1-git-send-email-sboyd@codeaurora.org>
From: Stepan Moskovchenko <stepanm@codeaurora.org>
Certain ARM CPU implementations (e.g. Cortex-A15) may not raise a
floating- point exception whenever deprecated short-vector VFP
instructions are executed. Instead these instructions are treated
as UNALLOCATED. Change the VFP exception handling code to emulate
short-vector instructions even if FPEXC exception bits are not
set.
Tested-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
---
arch/arm/vfp/vfphw.S | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/arch/arm/vfp/vfphw.S b/arch/arm/vfp/vfphw.S
index be807625ed8c..c041579a8d82 100644
--- a/arch/arm/vfp/vfphw.S
+++ b/arch/arm/vfp/vfphw.S
@@ -197,6 +197,12 @@ look_for_VFP_exceptions:
tst r5, #FPSCR_IXE
bne process_exception
+ tst r5, #FPSCR_LENGTH_MASK
+ beq skip
+ orr r1, r1, #FPEXC_DEX
+ b process_exception
+skip:
+
@ Fall into hand on to next handler - appropriate coproc instr
@ not recognised by VFP
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by The Linux Foundation
WARNING: multiple messages have this Message-ID (diff)
From: sboyd@codeaurora.org (Stephen Boyd)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 3/3] arm: vfp: Bounce undefined instructions in vectored mode
Date: Thu, 18 Sep 2014 14:43:12 -0700 [thread overview]
Message-ID: <1411076592-6157-4-git-send-email-sboyd@codeaurora.org> (raw)
In-Reply-To: <1411076592-6157-1-git-send-email-sboyd@codeaurora.org>
From: Stepan Moskovchenko <stepanm@codeaurora.org>
Certain ARM CPU implementations (e.g. Cortex-A15) may not raise a
floating- point exception whenever deprecated short-vector VFP
instructions are executed. Instead these instructions are treated
as UNALLOCATED. Change the VFP exception handling code to emulate
short-vector instructions even if FPEXC exception bits are not
set.
Tested-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
---
arch/arm/vfp/vfphw.S | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/arch/arm/vfp/vfphw.S b/arch/arm/vfp/vfphw.S
index be807625ed8c..c041579a8d82 100644
--- a/arch/arm/vfp/vfphw.S
+++ b/arch/arm/vfp/vfphw.S
@@ -197,6 +197,12 @@ look_for_VFP_exceptions:
tst r5, #FPSCR_IXE
bne process_exception
+ tst r5, #FPSCR_LENGTH_MASK
+ beq skip
+ orr r1, r1, #FPEXC_DEX
+ b process_exception
+skip:
+
@ Fall into hand on to next handler - appropriate coproc instr
@ not recognised by VFP
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by The Linux Foundation
next prev parent reply other threads:[~2014-09-18 21:43 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-18 21:43 [PATCH 0/3] Krait VFP fixes Stephen Boyd
2014-09-18 21:43 ` Stephen Boyd
2014-09-18 21:43 ` [PATCH 1/3] ARM: vfp: Workaround bad MVFR1 register on some Kraits Stephen Boyd
2014-09-18 21:43 ` Stephen Boyd
2014-09-18 21:43 ` [PATCH 2/3] ARM: vfp: fix VFPv3 hwcap detection on non-ARM vfp implementations Stephen Boyd
2014-09-18 21:43 ` Stephen Boyd
2014-09-18 22:46 ` Russell King - ARM Linux
2014-09-18 22:46 ` Russell King - ARM Linux
2014-09-19 18:24 ` Stephen Boyd
2014-09-19 18:24 ` Stephen Boyd
2014-10-01 17:54 ` Stephen Boyd
2014-10-01 17:54 ` Stephen Boyd
2014-10-08 12:49 ` Will Deacon
2014-10-08 12:49 ` Will Deacon
2014-10-01 21:50 ` Russell King - ARM Linux
2014-10-01 21:50 ` Russell King - ARM Linux
2014-10-01 22:09 ` Stephen Boyd
2014-10-01 22:09 ` Stephen Boyd
2014-09-18 21:43 ` Stephen Boyd [this message]
2014-09-18 21:43 ` [PATCH 3/3] arm: vfp: Bounce undefined instructions in vectored mode Stephen Boyd
2014-09-18 22:55 ` Russell King - ARM Linux
2014-09-18 22:55 ` Russell King - ARM Linux
2014-09-19 1:40 ` Will Deacon
2014-09-19 1:40 ` Will Deacon
2014-09-18 22:32 ` [PATCH 0/3] Krait VFP fixes Russell King - ARM Linux
2014-09-18 22:32 ` Russell King - ARM Linux
2014-09-19 16:29 ` Stephen Boyd
2014-09-19 16:29 ` Stephen Boyd
2014-09-21 16:40 ` Rob Clark
2014-09-21 16:40 ` Rob Clark
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