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From: Ard Biesheuvel <ardb@kernel.org>
To: linux-efi@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org,
	Ard Biesheuvel <ardb@kernel.org>,
	Russell King <linux@armlinux.org.uk>,
	Marc Zyngier <maz@kernel.org>, Nicolas Pitre <nico@fluxnic.net>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Tony Lindgren <tony@atomide.com>,
	Linus Walleij <linus.walleij@linaro.org>
Subject: [PATCH v3 3/5] ARM: decompressor: factor out routine to obtain the inflated image size
Date: Mon, 24 Feb 2020 13:17:31 +0100
Message-ID: <20200224121733.2202-4-ardb@kernel.org> (raw)
In-Reply-To: <20200224121733.2202-1-ardb@kernel.org>

Before adding another reference to the inflated image size, factor
out the slightly complicated way of loading the unaligned little-endian
constant from the end of the compressed data.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 arch/arm/boot/compressed/head.S | 43 ++++++++++++--------
 1 file changed, 26 insertions(+), 17 deletions(-)

diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
index 8487221bedb0..674e55400cfd 100644
--- a/arch/arm/boot/compressed/head.S
+++ b/arch/arm/boot/compressed/head.S
@@ -151,6 +151,25 @@
 .L_\@:
 		.endm
 
+		/*
+		 * The kernel build system appends the size of the
+		 * decompressed kernel at the end of the compressed data
+		 * in little-endian form.
+		 */
+		.macro	get_inflated_image_size, res:req, tmp1:req, tmp2:req
+		adr	\res, .Linflated_image_size_offset
+		ldr	\tmp1, [\res]
+		add	\tmp1, \tmp1, \res	@ offset of inflated image size
+
+		ldrb	\res, [\tmp1]		@ get_unaligned_le32
+		ldrb	\tmp2, [\tmp1, #1]
+		orr	\res, \res, \tmp2, lsl #8
+		ldrb	\tmp2, [\tmp1, #2]
+		ldrb	\tmp1, [\tmp1, #3]
+		orr	\res, \res, \tmp2, lsl #16
+		orr	\res, \res, \tmp1, lsl #24
+		.endm
+
 		.section ".start", "ax"
 /*
  * sort out different calling conventions
@@ -268,15 +287,15 @@ not_angel:
 		 */
 		mov	r0, pc
 		cmp	r0, r4
-		ldrcc	r0, LC0+32
+		ldrcc	r0, LC0+28
 		addcc	r0, r0, pc
 		cmpcc	r4, r0
 		orrcc	r4, r4, #1		@ remember we skipped cache_on
 		blcs	cache_on
 
 restart:	adr	r0, LC0
-		ldmia	r0, {r1, r2, r3, r6, r10, r11, r12}
-		ldr	sp, [r0, #28]
+		ldmia	r0, {r1, r2, r3, r6, r11, r12}
+		ldr	sp, [r0, #24]
 
 		/*
 		 * We might be running at a different address.  We need
@@ -284,20 +303,8 @@ restart:	adr	r0, LC0
 		 */
 		sub	r0, r0, r1		@ calculate the delta offset
 		add	r6, r6, r0		@ _edata
-		add	r10, r10, r0		@ inflated kernel size location
 
-		/*
-		 * The kernel build system appends the size of the
-		 * decompressed kernel at the end of the compressed data
-		 * in little-endian form.
-		 */
-		ldrb	r9, [r10, #0]
-		ldrb	lr, [r10, #1]
-		orr	r9, r9, lr, lsl #8
-		ldrb	lr, [r10, #2]
-		ldrb	r10, [r10, #3]
-		orr	r9, r9, lr, lsl #16
-		orr	r9, r9, r10, lsl #24
+		get_inflated_image_size	r9, r10, lr
 
 #ifndef CONFIG_ZBOOT_ROM
 		/* malloc space is above the relocated stack (64k max) */
@@ -652,13 +659,15 @@ LC0:		.word	LC0			@ r1
 		.word	__bss_start		@ r2
 		.word	_end			@ r3
 		.word	_edata			@ r6
-		.word	input_data_end - 4	@ r10 (inflated size location)
 		.word	_got_start		@ r11
 		.word	_got_end		@ ip
 		.word	.L_user_stack_end	@ sp
 		.word	_end - restart + 16384 + 1024*1024
 		.size	LC0, . - LC0
 
+.Linflated_image_size_offset:
+		.long	(input_data_end - 4) - .
+
 #ifdef CONFIG_ARCH_RPC
 		.globl	params
 params:		ldr	r0, =0x10000100		@ params_phys for RPC
-- 
2.17.1


  parent reply index

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-24 12:17 [PATCH v3 0/5] ARM: decompressor: use by-VA cache maintenance for v7 cores Ard Biesheuvel
2020-02-24 12:17 ` [PATCH v3 1/5] efi/arm: Work around missing cache maintenance in decompressor handover Ard Biesheuvel
2020-02-24 12:17 ` [PATCH v3 2/5] efi/arm: Pass start and end addresses to cache_clean_flush() Ard Biesheuvel
2020-02-24 12:17 ` Ard Biesheuvel [this message]
2020-02-24 12:17 ` [PATCH v3 4/5] ARM: decompressor: prepare cache_clean_flush for doing by-VA maintenance Ard Biesheuvel
2020-02-24 12:17 ` [PATCH v3 5/5] ARM: decompressor: switch to by-VA cache maintenance for v7 cores Ard Biesheuvel
2020-02-25 15:48 ` [PATCH v3 0/5] ARM: decompressor: use " Linus Walleij
2020-02-25 17:18   ` Ard Biesheuvel
2020-02-25 17:30     ` Ard Biesheuvel
2020-02-25 21:25     ` Linus Walleij

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