Honza Fikar writes:
> The bootloader made with as 2.9.1 works, while with 2.9.5 doesn't. The
> command line is :
>
> as -o boot.o boot.S
>
> I have attached the boot.S and the two results as well. If I add -a flag
> and compare the results, I can see, that there is a difference between
> the two outputs and it's only around instructions bne, b, beq, bl, bleq,
> blt.
This is expected - the way branches work in the toolchain changed around
2.9.5 (which is a pain because object files are now harder to follow when
objdumping them).
You can still work out the correct branch target by:
1. mask off the offset field from the branch instruction
2. sign extend
3. add 2
4. multiply by 4
5. add this to the current address.
> Is this a bug in gnu-as, or am I missing some command-line parameter, or
> should be the source changed?
I don't see anything wrong. What matters is what happens after when boot.o
becomes part of a larger object/binary.
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