| 61a7ad35 | 22-Dec-2021 |
Andrew Turner <[email protected]> |
Teach DTrace about BTI on arm64
The Branch Target Identification (BTI) Armv8-A extension adds new
instructions that can be placed where we may indirrectly branch to,
e.g. at the start of a function
Teach DTrace about BTI on arm64
The Branch Target Identification (BTI) Armv8-A extension adds new
instructions that can be placed where we may indirrectly branch to,
e.g. at the start of a function called via a function pointer. We can't
emulate these in DTrace as the kernel will have raised a different
exception before the DTrace handler has run.
Skip over the BTI instruction if it's used as the first instruction in
a function.
Sponsored by: The FreeBSD Foundation
(cherry picked from commit b5876847acfeae2dd3a655cde8cdf6145aed16d8)
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