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ARM: Add image end section 

In the upcoming multi image build process we will cat images together.
To find the concatenated image we need to reliably find the end of the
current binary. This adds a dummy section at the end of a pbl binary.
Its only purpose is to mark the end of the image. The multi image
patches will add something to this section so that it doesn't get
discarded by the linker.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2013-06-22 20:06:58 +02:00
parent 22159db6b0
commit e1bbf6be90
3 changed files with 11 additions and 1 deletions
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8
arch/arm/lib/pbl.lds.S
View File

@ -86,6 +86,12 @@ SECTIONS
}
__piggydata_end = .;
_barebox_image_size = __piggydata_end - (TEXT_BASE - SZ_2M);
. = ALIGN(4);
.image_end : {
KEEP(*(.image_end))
}
__image_end = .;
_barebox_image_size = __image_end - (TEXT_BASE - SZ_2M);
_barebox_pbl_size = __bss_start - (TEXT_BASE - SZ_2M);
}

3
arch/arm/lib/runtime-offset.S
View File

@ -42,6 +42,9 @@ ld_var_entry __dynsym_end
ld_var_entry _barebox_image_size
ld_var_entry __bss_start
ld_var_entry __bss_stop
#ifdef __PBL__
ld_var_entry __image_end
#endif
1:
ldr r1, =__ld_var_base

1
include/asm-generic/sections.h
View File

@ -6,6 +6,7 @@ extern char __bss_start[], __bss_stop[];
extern char _sdata[], _edata[];
extern char __bare_init_start[], __bare_init_end[];
extern char _end[];
extern char __image_end[];
extern void *_barebox_image_size;
extern void *_barebox_bare_init_size;
extern void *_barebox_pbl_size;