On what archs are PROT_READ and PROT_EXEC independent?

[Wei Hu]

Hello,

I know that newer Intel and AMD CPUs support readable and
non-executable pages. But from my tests, if I use mprotect() to set a
page's permission to be PROT_EXEC, that page is still readable. I'm
wondering what architectures implement these flags independently? Is
it possible to get executable and non-readable pages?

Thanks,
Wei
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