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[RFC] Defining an ELF attribute for RISC-V target profiles #409

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[RFC] Defining an ELF attribute for RISC-V target profiles #409

wants to merge 1 commit into from

Commits on Nov 28, 2023

  1. Defining an ELF attribute for RISC-V target profiles 

    This commit defines an ELF attribute which allows tools to set
a RISC-V target profile.

We already have a few ratified RISC-V profiles, but so far they are treated
as "pretty names" (or non-canonical abbreviations) for an ISA base plus a
set of extensions.

Further, most of the extensions of a profile are irrelevant for toolchain
components (e.g. supervisor mode extensions) and thus it is not clear how
to decompose profiles into an tools-compatible arch string, that allows to
reliably reconstruct the profile that a piece of software was written for
(i.e., the profile that the execution environment is expected to implement).

This commit attempts to resolve this situation by defining a new attribute
that allows to store the target profile.

The string representation is used to ensure a future-proof encoding.
This should not be a performance issue, since profile names are
typically very short (less than 10 characters).

This commit also provides a few hints for linkers and run-times, but does
not mandate anything.

Signed-off-by: Christoph Müllner <[email protected]>
    @cmuellner
    cmuellner committed Nov 28, 2023
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