gcc: Thumb interworking and weakly linked functions

Aneesh V aneesh at ti.com
Fri Feb 24 16:31:52 UTC 2012


On Thursday 23 February 2012 07:26 PM, Richard Earnshaw wrote:
> On 23/02/12 10:27, Aneesh V wrote:
>> Ok. Agree. I never used to use %function when I wrote assembly
>> functions earlier. I am sure a lot of code will break if this was
>> enforced.
>
> If you've not used %function on ARM, then your code is semantically
> broken even if it isn't syntactically broken.
>
> The ABI rules for dealing with interworking and and out-of-range
> branches all rely on %function being used correctly.

Hmm.. I learned it the hard way:)

BTW, very few assembly functions in U-Boot had %function or equivalent.
I am trying to clean it up at least for armv7.

Thanks,
Aneesh



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