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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 13/19] arm64: entry: template the entry asm functions
Date: Wed, 19 May 2021 13:38:56 +0100	[thread overview]
Message-ID: <20210519123902.2452-14-mark.rutland@arm.com> (raw)
In-Reply-To: <20210519123902.2452-1-mark.rutland@arm.com>

Now that the majority of the exception triage logic has been converted
to C, the entry assembly functions all have a uniform structure.

Let's generate them all with an assembly macro to reduce the amount of
code and to ensure they all remain in sync if we make changes in future.

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 | 124 ++++++++++------------------------------------
 1 file changed, 27 insertions(+), 97 deletions(-)

diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index 9b662d4c09d8..d4f80b9df621 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -610,114 +610,44 @@ SYM_CODE_START_LOCAL(el1_error_invalid)
 	inv_entry 1, BAD_ERROR
 SYM_CODE_END(el1_error_invalid)
 
-/*
- * EL1 mode handlers.
- */
-	.align	6
-SYM_CODE_START_LOCAL_NOALIGN(el1_sync)
-	kernel_entry 1
-	mov	x0, sp
-	bl	el1_sync_handler
-	b	ret_to_kernel
-SYM_CODE_END(el1_sync)
-
-	.align	6
-SYM_CODE_START_LOCAL_NOALIGN(el1_irq)
-	kernel_entry 1
-	mov	x0, sp
-	bl	el1_irq_handler
-	b	ret_to_kernel
-SYM_CODE_END(el1_irq)
-
-	.align 6
-SYM_CODE_START_LOCAL_NOALIGN(el1_fiq)
-	kernel_entry 1
-	mov	x0, sp
-	bl	el1_fiq_handler
-	b	ret_to_kernel
-SYM_CODE_END(el1_fiq)
-
+	.macro entry_handler el:req, regsize:req, label:req
 	.align 6
-SYM_CODE_START_LOCAL_NOALIGN(el1_error)
-	kernel_entry 1
+SYM_CODE_START_LOCAL_NOALIGN(el\el\()_\label)
+	kernel_entry \el, \regsize
 	mov	x0, sp
-	bl	el1_error_handler
+	bl	el\el\()_\label\()_handler
+	.if \el == 0
+	b	ret_to_user
+	.else
 	b	ret_to_kernel
-SYM_CODE_END(el1_error)
-
-SYM_CODE_START_LOCAL(ret_to_kernel)
-	kernel_exit 1
-SYM_CODE_END(ret_to_kernel)
+	.endif
+SYM_CODE_END(el\el\()_\label)
+	.endm
 
 /*
- * EL0 mode handlers.
+ * Early exception handlers
  */
-	.align	6
-SYM_CODE_START_LOCAL_NOALIGN(el0_sync)
-	kernel_entry 0
-	mov	x0, sp
-	bl	el0_sync_handler
-	b	ret_to_user
-SYM_CODE_END(el0_sync)
+	entry_handler	1, 64, sync
+	entry_handler	1, 64, irq
+	entry_handler	1, 64, fiq
+	entry_handler	1, 64, error
 
-	.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)
+	entry_handler	0, 64, sync
+	entry_handler	0, 64, irq
+	entry_handler	0, 64, fiq
+	entry_handler	0, 64, error
 
 #ifdef CONFIG_COMPAT
-	.align	6
-SYM_CODE_START_LOCAL_NOALIGN(el0_sync_compat)
-	kernel_entry 0, 32
-	mov	x0, sp
-	bl	el0_sync_compat_handler
-	b	ret_to_user
-SYM_CODE_END(el0_sync_compat)
-
-	.align	6
-SYM_CODE_START_LOCAL_NOALIGN(el0_irq_compat)
-	kernel_entry 0, 32
-	mov	x0, sp
-	bl	el0_irq_compat_handler
-	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
-	bl	el0_fiq_compat_handler
-	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
-	bl	el0_error_compat_handler
-	b	ret_to_user
-SYM_CODE_END(el0_error_compat)
+	entry_handler	0, 32, sync_compat
+	entry_handler	0, 32, irq_compat
+	entry_handler	0, 32, fiq_compat
+	entry_handler	0, 32, error_compat
 #endif
 
+SYM_CODE_START_LOCAL(ret_to_kernel)
+	kernel_exit 1
+SYM_CODE_END(ret_to_kernel)
+
 /*
  * "slow" syscall return path.
  */
-- 
2.11.0


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  parent reply	other threads:[~2021-05-19 13:10 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 ` [PATCH v2 08/19] arm64: entry: organise entry handlers consistently Mark Rutland
2021-05-21 16:04   ` 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 ` Mark Rutland [this message]
2021-05-21 17:16   ` [PATCH v2 13/19] arm64: entry: template the entry asm functions 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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