From: Ard Biesheuvel <ardb@kernel.org>
To: linux-arm-kernel@lists.infradead.org
Cc: linux-efi@vger.kernel.org, Ard Biesheuvel <ardb@kernel.org>,
Geert Uytterhoeven <geert+renesas@glider.be>,
Nicolas Pitre <nico@fluxnic.net>,
Linus Walleij <linus.walleij@linaro.org>,
Russell King <linux@armlinux.org.uk>
Subject: [PATCH 2/5] ARM: decompressor: split off _edata and stack base into separate object
Date: Fri, 27 Mar 2020 11:59:03 +0100 [thread overview]
Message-ID: <20200327105906.2665-3-ardb@kernel.org> (raw)
In-Reply-To: <20200327105906.2665-1-ardb@kernel.org>
In preparation of moving the handling of the LC0 object to a later stage
in the decompressor startup code, move out _edata and the initial value
of the stack pointer, which are now used in two places, and are needed
earlier than the remaining contents of LC0.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
arch/arm/boot/compressed/head.S | 33 +++++++++-----------
1 file changed, 15 insertions(+), 18 deletions(-)
diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
index bb674febf640..a6cf2f8115e5 100644
--- a/arch/arm/boot/compressed/head.S
+++ b/arch/arm/boot/compressed/head.S
@@ -259,19 +259,16 @@ not_angel:
* Find the start of physical memory.
* Try the DTB first, if available.
*/
- adr r0, LC0
- ldr r1, [r0] @ get absolute LC0
- ldr sp, [r0, #24] @ get stack location
- sub r1, r0, r1 @ compute relocation offset
- add sp, sp, r1 @ apply relocation
+ adr r0, LC1
+ ldmia r0, {r1, r6}
+ add sp, r1, r0 @ get stack location
+ add r6, r6, r0 @ get &_edata
#ifdef CONFIG_ARM_APPENDED_DTB
/*
* Look for an appended DTB. If found, use it and
* move stack away from it.
*/
- ldr r6, [r0, #12] @ get &_edata
- add r6, r6, r1 @ relocate it
ldmia r6, {r0, r5} @ get DTB signature and size
#ifndef __ARMEB__
ldr r1, =0xedfe0dd0 @ sig is 0xd00dfeed big endian
@@ -345,22 +342,19 @@ not_angel:
orrcc r4, r4, #1 @ remember we skipped cache_on
blcs cache_on
-restart: adr r0, LC0
- ldmia r0, {r1, r2, r3, r6, r11, r12}
- ldr sp, [r0, #24]
+restart: adr r0, LC1
+ ldmia r0, {r1, r6}
+ add sp, r1, r0
+ add r6, r6, r0
- /*
- * We might be running at a different address. We need
- * to fix up various pointers.
- */
+ adr r0, LC0
+ ldmia r0, {r1, r2, r3, r11, r12}
sub r0, r0, r1 @ calculate the delta offset
- add r6, r6, r0 @ _edata
get_inflated_image_size r9, r10, lr
#ifndef CONFIG_ZBOOT_ROM
/* malloc space is above the relocated stack (64k max) */
- add sp, sp, r0
add r10, sp, #0x10000
#else
/*
@@ -712,12 +706,15 @@ not_relocated: mov r0, #0
LC0: .word LC0 @ r1
.word __bss_start @ r2
.word _end @ r3
- .word _edata @ r6
.word _got_start @ r11
.word _got_end @ ip
- .word .L_user_stack_end @ sp
.size LC0, . - LC0
+ .type LC1, #object
+LC1: .word .L_user_stack_end - LC1 @ sp
+ .word _edata - LC1 @ r6
+ .size LC1, . - LC1
+
.Lheadroom:
.word _end - restart + 16384 + 1024*1024
--
2.17.1
next prev parent reply other threads:[~2020-03-27 10:59 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-27 10:59 [PATCH 0/5] ARM: simplify handover from UEFI to decompressor Ard Biesheuvel
2020-03-27 10:59 ` [PATCH 1/5] ARM: decompressor: move headroom variable out of LC0 Ard Biesheuvel
2020-03-27 13:23 ` Geert Uytterhoeven
2020-03-27 13:59 ` Ard Biesheuvel
2020-03-27 10:59 ` Ard Biesheuvel [this message]
2020-03-27 13:23 ` [PATCH 2/5] ARM: decompressor: split off _edata and stack base into separate object Geert Uytterhoeven
2020-03-27 10:59 ` [PATCH 3/5] ARM: decompressor: defer loading of the contents of the LC0 structure Ard Biesheuvel
2020-03-27 13:24 ` Geert Uytterhoeven
2020-03-27 10:59 ` [PATCH 4/5] ARM: decompressor: move GOT into .data for EFI enabled builds Ard Biesheuvel
2020-03-27 10:59 ` [PATCH 5/5] ARM: decompressor: run decompressor in place if loaded via UEFI Ard Biesheuvel
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