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LouisBrunner / valgrind-macos

A valgrind mirror with latest macOS support
GNU General Public License v2.0
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M1/M2 Compatibility #56

Open gilaroni opened 1 year ago

gilaroni commented 1 year ago

will there be a version for m1?

paulfloyd commented 4 months ago

Not really, mostly guessing/trial and error. But the DCZID_EL0 register specifies the proper value, so could use that to double-check. The current code sets this to an invalid value, hoping that generic code would not then use this instruction, but macOS OS-level code is not generic... Purely by arch-spec we'd just need to make sure that the DCZID_EL0 return value and the size used by DC_ZVA match, but as far as I can tell that will not work on macOS, unless it all matches what the actual M processors do. DISCLAIMER: it's all guesswork from my side.

I am not very knowledgeable about this so thanks for this background as it will make easier to research and fix.

I just pushed a bunch of changes upstream for arm64 concerning several mrs and dc opcodes. That includes mrs dczd_el0 and dc zva.