Clarify when sdata is valid.

[j0106223]

Hi Iain,

In RISC-V Hart to Trace Interface Specification Version v0.82, 2026-01-06: Draft,
the function of sdata is described as follows:

Store data. Valid when dretire is high and access is a store (dtype is 1
or 3) or atomic (dtype is 8 - 14). dtype

However, the cases for CSRs (dtype = 4, 5, 6) and compare-and-swap failure (dtype = 7) are not mentioned.

Best regards,
Jack

[IainCRobertson]

Good spot Jack. I've amended to include dtype 4-6 for CSRs. CAS failure doesn't have any store data so isn't mentioned (same as conditional store failure).

[j0106223]

For a CAS failure, is the load data required?

[IainCRobertson]

Yes I think so. Knowing that might be useful if you were trying to figure out from the trace why the CAS failed.

[j0106223]

Thank you for the clarification.