[ELF][Cheri] Adjust section ranks to minimise PT_CHERI_PCC #806
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When PCC bounds are in use, further divide up the existing section category order to ensure PCC sections are contiguous. Note that, in order to avoid emitting multiple PT_GNU_RELRO segments (since, whilst CheriBSD supports it, other CHERI runtimes may not yet), the PCC RW sections are flipped compared with the non-PCC ones, with RELRO sections coming after, not before, the non-RELRO sections.
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I haven't yet tested this with CheriBSD, and I'd also like to test merge it to Morello LLVM as well, but putting this up now as I'm done for the night. |
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When PCC bounds are in use, further divide up the existing section
category order to ensure PCC sections are contiguous. Note that, in
order to avoid emitting multiple PT_GNU_RELRO segments (since, whilst
CheriBSD supports it, other CHERI runtimes may not yet), the PCC RW
sections are flipped compared with the non-PCC ones, with RELRO sections
coming after, not before, the non-RELRO sections.