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From: Mark Rutland <mark.rutland@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: catalin.marinas@arm.com, james.morse@arm.com,
	mark.rutland@arm.com, maz@kernel.org, will@kernel.org,
	joey.gouly@arm.com
Subject: [PATCH v2 08/19] arm64: entry: organise entry handlers consistently
Date: Wed, 19 May 2021 13:38:51 +0100	[thread overview]
Message-ID: <20210519123902.2452-9-mark.rutland@arm.com> (raw)
In-Reply-To: <20210519123902.2452-1-mark.rutland@arm.com>

In entry.S we have two comments which distinguish EL0 and EL1 exception
handlers, but the code isn't actually laid out this way, and there are a
few other inconsitencies that would be good to clear up.

This patch organizes the entry handers consistently:

* The handlers are laid out in order of the vectors, to make them easier
  to navigate.

* All handlers are given the same alignment, which was previously
  applied inconsitently.

There should be no functional change as a result of this patch.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Will Deacon <will@kernel.org>
---
 arch/arm64/kernel/entry.S | 64 ++++++++++++++++++++++++++---------------------
 1 file changed, 35 insertions(+), 29 deletions(-)

diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index eebc6e72125c..a1dd730a474d 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -629,6 +629,7 @@ SYM_CODE_START_LOCAL_NOALIGN(el1_irq)
 	kernel_exit 1
 SYM_CODE_END(el1_irq)
 
+	.align 6
 SYM_CODE_START_LOCAL_NOALIGN(el1_fiq)
 	kernel_entry 1
 	mov	x0, sp
@@ -636,6 +637,14 @@ SYM_CODE_START_LOCAL_NOALIGN(el1_fiq)
 	kernel_exit 1
 SYM_CODE_END(el1_fiq)
 
+	.align 6
+SYM_CODE_START_LOCAL_NOALIGN(el1_error)
+	kernel_entry 1
+	mov	x0, sp
+	bl	el1_error_handler
+	kernel_exit 1
+SYM_CODE_END(el1_error)
+
 /*
  * EL0 mode handlers.
  */
@@ -647,6 +656,30 @@ SYM_CODE_START_LOCAL_NOALIGN(el0_sync)
 	b	ret_to_user
 SYM_CODE_END(el0_sync)
 
+	.align	6
+SYM_CODE_START_LOCAL_NOALIGN(el0_irq)
+	kernel_entry 0
+	mov	x0, sp
+	bl	el0_irq_handler
+	b	ret_to_user
+SYM_CODE_END(el0_irq)
+
+	.align 6
+SYM_CODE_START_LOCAL_NOALIGN(el0_fiq)
+	kernel_entry 0
+	mov	x0, sp
+	bl	el0_fiq_handler
+	b	ret_to_user
+SYM_CODE_END(el0_fiq)
+
+	.align 6
+SYM_CODE_START_LOCAL_NOALIGN(el0_error)
+	kernel_entry 0
+	mov	x0, sp
+	bl	el0_error_handler
+	b	ret_to_user
+SYM_CODE_END(el0_error)
+
 #ifdef CONFIG_COMPAT
 	.align	6
 SYM_CODE_START_LOCAL_NOALIGN(el0_sync_compat)
@@ -664,6 +697,7 @@ SYM_CODE_START_LOCAL_NOALIGN(el0_irq_compat)
 	b	ret_to_user
 SYM_CODE_END(el0_irq_compat)
 
+	.align 6
 SYM_CODE_START_LOCAL_NOALIGN(el0_fiq_compat)
 	kernel_entry 0, 32
 	mov	x0, sp
@@ -671,6 +705,7 @@ SYM_CODE_START_LOCAL_NOALIGN(el0_fiq_compat)
 	b	ret_to_user
 SYM_CODE_END(el0_fiq_compat)
 
+	.align 6
 SYM_CODE_START_LOCAL_NOALIGN(el0_error_compat)
 	kernel_entry 0, 32
 	mov	x0, sp
@@ -679,35 +714,6 @@ SYM_CODE_START_LOCAL_NOALIGN(el0_error_compat)
 SYM_CODE_END(el0_error_compat)
 #endif
 
-	.align	6
-SYM_CODE_START_LOCAL_NOALIGN(el0_irq)
-	kernel_entry 0
-	mov	x0, sp
-	bl	el0_irq_handler
-	b	ret_to_user
-SYM_CODE_END(el0_irq)
-
-SYM_CODE_START_LOCAL_NOALIGN(el0_fiq)
-	kernel_entry 0
-	mov	x0, sp
-	bl	el0_fiq_handler
-	b	ret_to_user
-SYM_CODE_END(el0_fiq)
-
-SYM_CODE_START_LOCAL(el1_error)
-	kernel_entry 1
-	mov	x0, sp
-	bl	el1_error_handler
-	kernel_exit 1
-SYM_CODE_END(el1_error)
-
-SYM_CODE_START_LOCAL(el0_error)
-	kernel_entry 0
-	mov	x0, sp
-	bl	el0_error_handler
-	b	ret_to_user
-SYM_CODE_END(el0_error)
-
 /*
  * "slow" syscall return path.
  */
-- 
2.11.0


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  parent reply	other threads:[~2021-05-19 13:09 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-19 12:38 [PATCH v2 00/19] arm64: entry: migrate more code to C Mark Rutland
2021-05-19 12:38 ` [PATCH v2 01/19] arm64: remove redundant local_daif_mask() in bad_mode() Mark Rutland
2021-05-21 10:39   ` Joey Gouly
2021-05-19 12:38 ` [PATCH v2 02/19] arm64: entry: unmask IRQ+FIQ after EL0 handling Mark Rutland
2021-05-25 16:45   ` Joey Gouly
2021-05-19 12:38 ` [PATCH v2 03/19] arm64: entry: convert SError handlers to C Mark Rutland
2021-05-25 13:38   ` Joey Gouly
2021-05-19 12:38 ` [PATCH v2 04/19] arm64: entry: move arm64_preempt_schedule_irq to entry-common.c Mark Rutland
2021-05-21 11:00   ` Joey Gouly
2021-05-19 12:38 ` [PATCH v2 05/19] arm64: entry: move preempt logic to C Mark Rutland
2021-05-25 12:50   ` Joey Gouly
2021-05-19 12:38 ` [PATCH v2 06/19] arm64: entry: add a call_on_irq_stack helper Mark Rutland
2021-05-19 14:46   ` Mark Rutland
2021-05-19 12:38 ` [PATCH v2 07/19] arm64: entry: convert IRQ+FIQ handlers to C Mark Rutland
2021-05-21 13:19   ` Joey Gouly
2021-05-21 15:23     ` Mark Rutland
2021-05-19 12:38 ` Mark Rutland [this message]
2021-05-21 16:04   ` [PATCH v2 08/19] arm64: entry: organise entry handlers consistently Joey Gouly
2021-05-19 12:38 ` [PATCH v2 09/19] arm64: entry: organise entry vectors consistently Mark Rutland
2021-05-21 16:07   ` Joey Gouly
2021-05-19 12:38 ` [PATCH v2 10/19] arm64: entry: consolidate EL1 exception returns Mark Rutland
2021-05-21 16:22   ` Joey Gouly
2021-05-19 12:38 ` [PATCH v2 11/19] arm64: entry: move bad_mode() to entry-common.c Mark Rutland
2021-05-21 16:46   ` Joey Gouly
2021-05-19 12:38 ` [PATCH v2 12/19] arm64: entry: improve bad_mode() Mark Rutland
2021-05-21 17:02   ` Joey Gouly
2021-05-21 17:10     ` Mark Rutland
2021-05-19 12:38 ` [PATCH v2 13/19] arm64: entry: template the entry asm functions Mark Rutland
2021-05-21 17:16   ` Joey Gouly
2021-05-19 12:38 ` [PATCH v2 14/19] arm64: entry: handle all vectors with C Mark Rutland
2021-05-21 15:59   ` Joey Gouly
2021-05-21 16:41     ` Mark Rutland
2021-05-19 12:38 ` [PATCH v2 15/19] arm64: entry: split bad stack entry Mark Rutland
2021-05-25 11:25   ` Joey Gouly
2021-05-19 12:38 ` [PATCH v2 16/19] arm64: entry: split SDEI entry Mark Rutland
2021-05-25 11:49   ` Joey Gouly
2021-05-19 12:39 ` [PATCH v2 17/19] arm64: entry: make NMI entry/exit functions static Mark Rutland
2021-05-21 17:21   ` Joey Gouly
2021-05-19 12:39 ` [PATCH v2 18/19] arm64: entry: don't instrument entry code with KCOV Mark Rutland
2021-05-19 12:39 ` [PATCH v2 19/19] arm64: idle: don't instrument idle " Mark Rutland

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