[PATCH][lld] Begin AArch64 support

[Shankar Easwaran]

Hi Tim,

The patch looks good except for these

a) I dont see any relocations being handled
b) How are you testing it, if you dont have any relocations added ?

> But I couldn't see a way to test converting an "R_AARCH64_..." string
> into its internal representation (i.e. yaml -> ELF -> something
> useful). "lld -core" didn't seem to want to do anything
> target-specific no matter what I told it, and "lld -flavor gnu"
> persisted in thinking I was giving it a linker script rather than a
> YAMLised ELF file.

The way to test would be :-

lld -flavor gnu -target [x86_64|hexagon|x86] ....

For your case you need to handle aarch64 seperately (see lld-core.cpp).

* You would need to change lld-core.cpp to recognize aarch64.

Thanks

Shankar Easwaran

On 5/6/2013 11:43 AM, Tim Northover wrote:
> Hi all,
>
> I've been poking around at lld a bit today (purely for my own
> entertainment on the bank-holiday), trying to work out how much is
> involved in adding a new target.
>
> The attached patch makes a very basic start on AArch64, essentially
> containing just enough class definitions to compile and teaching lld
> about the names of our relocations (well, the ones LLVM itself knows
> about anyway).
>
> Most of the features (such as they are) are tested, I believe.
>
> But I couldn't see a way to test converting an "R_AARCH64_..." string
> into its internal representation (i.e. yaml -> ELF -> something
> useful). "lld -core" didn't seem to want to do anything
> target-specific no matter what I told it, and "lld -flavor gnu"
> persisted in thinking I was giving it a linker script rather than a
> YAMLised ELF file.
>
> Can I commit in broad terms, and if so should I break it up into its
> three testable bits (triviality; read R_AARCH strings; write R_AARCH
> strings) or leave it as is?
>
> Cheers.
>
> Tim.
>
>
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