[PATCH] D139377: [compiler-rt][hwasan] Let CheckAddressSized eventually call HandleTagMismatch on Fuchsia

[Leonard Chan via Phabricator via llvm-commits]

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Any hwasan tag checking done through runtime calls like `__hwasan_mem*` or `__hwasan_load/store*` currently raise a sigtrap on a tag mismatch. Hwasan dumps as much information it knows on the tag mismatch by placing important values in specific registers before the `brk` and encoding the access information in the optional argument supplied to the `brk`. If the platform hwasan runs on uses signal handlers, then users can see the typical pretty hwasan error report, but Fuchsia doesn't use signal handlers, so it's left up to the platform exception handler to print all this encoded information.

This patch attempts to enter the regular error reporting path via `HandleTagMismatch` if a new macro `CAN_GET_REGISTERS` is set. For now this is only defined for Fuchsia + aarch64, but can be expanded for other platforms.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D139377

Files:
  compiler-rt/lib/hwasan/hwasan_checks.h
  compiler-rt/lib/hwasan/hwasan_registers.h

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