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ARM: zImage: no need to get the decompressed size from the filesystem 

In commit d239b1dc09 the hardcoded 4x estimate for the decompressed
kernel size was replaced by the exact Image file size and passed to
the linker as a symbol value.  Turns out that this is unneeded as the
size is already included at the end of the compressed piggy data.
For those compressed formats that don't include this data, the build
system already takes care of appending it using size_append in
scripts/Makefile.lib.  So let's use that instead.

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Tested-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Nicolas Pitre 2011-04-19 15:42:43 -04:00 committed by Nicolas Pitre
parent ea9df3b168
commit 34cc1a8fe0
2 changed files with 16 additions and 4 deletions
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2
arch/arm/boot/compressed/Makefile
View File

@ -98,8 +98,6 @@ endif
ccflags-y := -fpic -fno-builtin
asflags-y := -Wa,-march=all
# Provide size of uncompressed kernel to the decompressor via a linker symbol.
LDFLAGS_vmlinux = --defsym _image_size=$(shell stat -c "%s" $(obj)/../Image)
# Supply ZRELADDR to the decompressor via a linker symbol.
ifneq ($(CONFIG_AUTO_ZRELADDR),y)
LDFLAGS_vmlinux += --defsym zreladdr=$(ZRELADDR)

18
arch/arm/boot/compressed/head.S
View File

@ -187,7 +187,7 @@ not_angel:
bl cache_on
restart: adr r0, LC0
ldmia r0, {r1, r2, r3, r6, r9, r11, r12}
ldmia r0, {r1, r2, r3, r6, r10, r11, r12}
ldr sp, [r0, #28]
/*
@ -196,6 +196,20 @@ 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
#ifndef CONFIG_ZBOOT_ROM
/* malloc space is above the relocated stack (64k max) */
@ -355,7 +369,7 @@ LC0: .word LC0 @ r1
.word __bss_start @ r2
.word _end @ r3
.word _edata @ r6
.word _image_size @ r9
.word input_data_end - 4 @ r10 (inflated size location)
.word _got_start @ r11
.word _got_end @ ip
.word user_stack_end @ sp