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[Morello] Add the morello descriptor ABI specification. #103

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[Morello] Add the morello descriptor ABI specification. #103

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Commits on Jul 15, 2021

  1. [Morello] Add the morello descriptor ABI specification.

    @sbaranga-arm
    sbaranga-arm committed Jul 15, 2021
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Commits on Sep 12, 2023

  1. [Morello] Update Descriptor ABI specification 

    This makes the Capability Private Data Addressing Register caller-saved,
with the following effects:
  - r19 and r20 are now callee-saved
  - Removes need for global entry points
  - All functions start with mov c28, c29 for setting up c28 in the callee.
    Relocations for direct branches need to jump over this instruction.
  - Relaxation relocations (R_MORELLO_DESC_CALL and R_MORELLO_DESC_TCALL) are
    now removed since they are no longer needed.
    @sbaranga-arm
    sbaranga-arm committed Sep 12, 2023
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