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PACBTI #4

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thejpster opened this issue Apr 23, 2024 · 2 comments
Open

PACBTI #4

thejpster opened this issue Apr 23, 2024 · 2 comments

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@thejpster
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Arm Cortex-M85 has optional PACBTI - pointer authentication and branch target identification.

The feature is pacbti and I suspect target-cpu=cortex-m85 turns it on.
@thejpster
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I can't see how to make rustc emit code that uses PACBTI, even with the feature turned on, and writing a function that does sketchy things was pointers to stack buffers.

@thejpster
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https://doc.rust-lang.org/unstable-book/compiler-flags/branch-protection.html says do:

-Z branch-protection=bti,pac-ret,leaf

but this only works on aarch64.

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@thejpster