Hello Albert,
Albert ARIBAUD wrote:
Le 29/11/2010 16:04, Heiko Schocher a écrit :
Hello Albert,
Albert ARIBAUD wrote:
I'll take a look this evening at builds with and without the SORT() from an ELF relocation tables perspective.
I debugged on the beagle board a little bit in this problem, and here what I found:
[...]
Why is the rel.dyn Section in the bss section?
The .rel.dyn section is not "in" or "out" of the BSS: they are overlapped, i.e. they should start at the same address.
As indicated in the documentation, BSS should never be used before relocation; it actually *cannot* be written into by boards which start from NOR, and is set to zero for all boards right after relocation.
Yep.
Since BSS does not exist before relocation, and .rel.dyn does not exist after relocation, they can use the same location: overlaying them is the best approach in order to get the smallest binary in Flash *and* the smallest image in RAM.
Ah, thats what I missed, thanks!
We can add code to try and catch the most obvious corruption of the relocation tables due to BSS being accessed before relocation, but we can't be sure to catch them all. The real solution is to fix the BSS usage.
Yep.
bye, Heiko