From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 23/23] ARM: entry: no need to reload the SPSR value from struct pt_regs
Date: Wed, 29 Jun 2011 10:26:36 +0100 [thread overview]
Message-ID: <E1Qbr2a-0002Gi-Fw@rmk-PC.arm.linux.org.uk> (raw)
In-Reply-To: <20110629091853.GK21898@n2100.arm.linux.org.uk>
The SVC IRQ, prefetch and data abort handlers preserve the SPSR value
via r5 across the exception. Rather than re-loading it from pt_regs,
use the preserved value instead.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
arch/arm/kernel/entry-armv.S | 10 +---------
1 files changed, 1 insertions(+), 9 deletions(-)
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index 3fa90ae..047ed5d 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -195,10 +195,6 @@ __dabt_svc:
@
disable_irq_notrace
- @
- @ restore SPSR and restart the instruction
- @
- ldr r5, [sp, #S_PSR]
#ifdef CONFIG_TRACE_IRQFLAGS
tst r5, #PSR_I_BIT
bleq trace_hardirqs_on
@@ -223,7 +219,7 @@ __irq_svc:
tst r0, #_TIF_NEED_RESCHED
blne svc_preempt
#endif
- ldr r5, [sp, #S_PSR]
+
#ifdef CONFIG_TRACE_IRQFLAGS
@ The parent context IRQs must have been enabled to get here in
@ the first place, so there's no point checking the PSR I bit.
@@ -308,10 +304,6 @@ __pabt_svc:
@
disable_irq_notrace
- @
- @ restore SPSR and restart the instruction
- @
- ldr r5, [sp, #S_PSR]
#ifdef CONFIG_TRACE_IRQFLAGS
tst r5, #PSR_I_BIT
bleq trace_hardirqs_on
--
1.7.4.4
next prev parent reply other threads:[~2011-06-29 9:26 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-29 9:18 [PATCH 00/23] entry assembly cleanups Russell King - ARM Linux
2011-06-29 9:19 ` [PATCH 01/23] ARM: entry: remove unused irq_prio_table macro Russell King - ARM Linux
2011-06-29 9:19 ` [PATCH 02/23] ARM: entry: shark: don't directly reference registers in macros Russell King - ARM Linux
2011-06-29 9:19 ` [PATCH 03/23] ARM: entry: prefetch/data abort helpers: convert to macros Russell King - ARM Linux
2011-06-29 9:20 ` [PATCH 00/23] entry assembly cleanups Russell King - ARM Linux
2011-06-29 9:20 ` [PATCH 04/23] ARM: entry: prefetch/data abort helpers: avoid corrupting r4 Russell King - ARM Linux
2011-06-29 9:20 ` [PATCH 05/23] ARM: entry: abort-macro: specify registers to be used for macros Russell King - ARM Linux
2011-06-29 9:20 ` [PATCH 06/23] ARM: entry: abort-macro: simplify do_ldrd_abort Russell King - ARM Linux
2011-06-29 9:21 ` [PATCH 07/23] ARM: entry: no need to increase preempt count for IRQ handlers Russell King - ARM Linux
2011-06-29 9:21 ` [PATCH 08/23] ARM: entry: no need to check parent IRQ mask in IRQ handler return Russell King - ARM Linux
2011-06-29 9:21 ` [PATCH 09/23] ARM: entry: rejig register allocation in exception entry handlers Russell King - ARM Linux
2011-06-29 9:22 ` [PATCH 10/23] ARM: entry: prefetch abort helper: pass aborted pc in r4 rather than r0 Russell King - ARM Linux
2011-06-29 9:22 ` [PATCH 11/23] ARM: entry: avoid enabling interrupts in prefetch/data abort handlers Russell King - ARM Linux
2011-06-29 20:05 ` Will Deacon
2011-06-30 9:27 ` Russell King - ARM Linux
2011-06-30 21:51 ` Will Deacon
2011-06-29 9:22 ` [PATCH 12/23] ARM: entry: instrument svc undefined exception handler with irqtrace Russell King - ARM Linux
2011-06-29 9:23 ` [PATCH 13/23] ARM: entry: instrument usr exception handlers with irqsoff tracing Russell King - ARM Linux
2011-06-29 9:23 ` [PATCH 14/23] ARM: entry: consolidate trace_hardirqs_off into (svc|usr)_entry macros Russell King - ARM Linux
2011-06-29 9:23 ` [PATCH 15/23] ARM: entry: re-allocate registers in irq entry assembly macros Russell King - ARM Linux
2011-06-29 9:24 ` [PATCH 16/23] ARM: entry: prefetch abort: tail-call the main prefetch abort handler Russell King - ARM Linux
2011-06-29 9:24 ` [PATCH 17/23] ARM: entry: data abort: arrange for CPU abort helpers to take pc/psr in r4/r5 Russell King - ARM Linux
2011-06-29 9:24 ` [PATCH 18/23] ARM: entry: data abort: avoid using r2 in abort helpers Russell King - ARM Linux
2011-06-29 9:25 ` [PATCH 19/23] ARM: entry: data abort: tail-call the main data abort handler Russell King - ARM Linux
2011-06-29 9:25 ` [PATCH 20/23] ARM: entry: data abort: use r2 as base of pt_regs rather than stack Russell King - ARM Linux
2011-06-29 9:25 ` [PATCH 21/23] ARM: entry: data abort: always use r6 for offset Russell King - ARM Linux
2011-06-29 9:26 ` [PATCH 22/23] ARM: entry: data abort: ensure r5 is preserved by abort functions Russell King - ARM Linux
2011-06-29 9:26 ` Russell King - ARM Linux [this message]
2011-06-29 14:53 ` [PATCH 00/23] entry assembly cleanups Jean-Christophe PLAGNIOL-VILLARD
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