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SubjectRe: [PATCH 1/2] elf loader support for auxvec base platform string
Nathan Lynch writes:
> Some IBM POWER-based platforms have the ability to run in a
> mode which mostly appears to the OS as a different processor from the
> actual hardware. For example, a Power6 system may appear to be a
> Power5+, which makes the AT_PLATFORM value "power5+".
>
> However, some applications (virtual machines, optimized libraries) can
> benefit from knowledge of the underlying CPU model. A new aux vector
> entry, AT_BASE_PLATFORM, will denote the actual hardware. For
> example, on a Power6 system in Power5+ compatibility mode, AT_PLATFORM
> will be "power5+" and AT_BASE_PLATFORM will be "power6".

Why on earth would you ever want AT_PLATFORM to differ from AT_BASE_PLATFORM?
In cases that matter you admit that AT_BASE_PLATFORM takes precedence,
so why involve a fake lame not-quite-the-platform in the first place?

Workaround for buggy software?


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