[cfe-dev] [llvm-dev] [RFC][ARM] Add support for embedded position-independent code (ROPI/RWPI)

Tim Northover via cfe-dev cfe-dev at lists.llvm.org
Fri Dec 4 08:53:23 PST 2015


On 4 December 2015 at 05:46, Oliver Stannard via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
> SysV-style PIC solves this by having the dynamic linker fix up any
> relocations on the data segment. Since these modes are trying to avoid
> the need for a dynamic linker, we instead have the compiler emit code to
> initialise these variables at startup time. These initiailisers are
> expected to be rare, so the dynamic initiaslisers will be smaller than
> the equivalent dynamic linker plus relocation and symbol tables.

What does armcc do here? It's been a while but I thought it was part
of the scatter-loading initialisation, with some kind of compressed
representation in the final linked image.

Cheers.

Tim.


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