Re: [edk2-devel] static data in dxe_runtime modules

["Andrew Fish" <afish@apple.com>]

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Roman,

Sorry for the top post, as my email client seems to have eating your email.

1) In C static scopes the visibility of the symbol from a compiler linker point of view, but the static and non-static globals are going to be stored in the same section of the image. On macOS clang the only difference is the static global does not also have a .globl assembly directive to make the label visible outside the scope of the module.

In general Runtime Drivers will gather data that is only available at boot time and store this data in globals, so you can't clear out part of the image on fix-up as that would break a lot of other stuff.

2) The corrrect answer would be to fixup any pointers needed at runtime via RuntimeCryptLibAddressChangeEvent(). On option would be to have an array of the addresses of the static variables and have RuntimeCryptLibAddressChangeEvent() walk that and fixup the Physical addresses to virtual addresses by calling EfiConvertPointer().

Thanks,

Andrew Fish

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