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Use resumereq instead of DRET #132

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Use resumereq instead of DRET #132

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Commits on Feb 28, 2024

  1. Use resumereq instead of DRET 

    DRET is not a standard instruction.  Its only mention in the debug spec
is in a non-normative section describing a single possible
implementation, in a clause describing how the debug module might
internally implement the dmstatus.resumereq field.  While DRET has a
reserved opcode for implementations which use it or something like it,
it is itself a custom extension whenever it appears.

Describe CHERI functions in terms of the architectural
dmstatus.resumereq instead of the non-architectural DRET.

Signed-off-by: Stefan O'Rear <[email protected]>
    @sorear
    sorear committed Feb 28, 2024
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  2. Hardware implementations section for debug 

    This mirrors Appendix A in the debug specification to describe how the
illustrative implementations have to be adapted for Zcheri_purecap and
Zcheri_legacy.

Signed-off-by: Stefan O'Rear <[email protected]>
    @sorear
    sorear committed Feb 28, 2024
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