[U-Boot] [PATCH v1 6/7] MIPS: u-boot.lds: add relocation specific sections

[Daniel Schwierzeck]

2013/2/11 Gabor Juhos <juhosg at openwrt.org>:
>> that's weird. Actually I checked after each patch if the *_end symbols
>> match the U-Boot binary size. Now I checked again with different
>> toolchains (gcc-4.[5,6,7], binutils-2.[21.53,22] and I have again that
>> binutils issue.
>>
>> But all toolchains have one in common (tested with qemu_mips):
>> __rel_dyn_end - __rel_dyn_start = 0x1770
>> size from readelf = 0x15f8
>>
>> Another problem is that your .deadcode workaround does not work
>> anymore for me. It does not matter how I arrange or drop the unneeded
>> sections, the size of .rel.dyn remains at 0x1770. I'll try to find
>> another solution.
>
> Erm, the presence of the .deadcode section does not change the size of the
> .rel.dyn section.
>
> The ELF headers shows that there is a gap between the .rel.dyn and the .deadcode
> section:
>
>   [ 6] .rel.dyn          REL             bfc30804 030864 0015f8 08   A  8   0  4
>   [ 7] .deadcode         PROGBITS        bfc31f74 031fd4 000004 00  WA  0   0  1
>
> However objcopy will copy the .deadcode section into the final binary because it
> is placed after the .rel.dyn section, and the gap will be filled with 0xff bytes.
>
> As a result, the size of u-boot.bin will equal to (__rel_dyn_end - __start + 4),
> and this ensures that it will contain the full .rel.dyn section.
>

ok.
I guess I misunderstood the intention of your workaround. My goal was
to minimize the increase of image size caused by PIE.

I'll send a v2 of patch 6/7 with the .deadcode section.

-- 
Best regards,
Daniel