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[ARM64EC 9/?] Implement CFGuard convention.
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Authored by efriedma on Jun 1 2022, 12:41 PM.
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Summary

Part of initial Arm64EC patchset.

CFG checkers on ARM64EC take two arguments: the callee, and an exit thunk to translate. The values are passed in x11 and x10. The function to call is then returned in x11.

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