CHERI-RISC-V: slightly rearrange SLTI HINT decoder #180
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jrtc27
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Nov 12, 2021
- Restructure the code under the assumption that there will be HINT consumers
other than TCG_LOG_INSTR.
- Document the current and near-term allocations of the opcode space:
- Move the TCG_LOG_INSTR tests to match rs1 == x0, which is the only form that
we have emitted, but we were never ignoring rs1.
- Reserve `SLTI x0, x31, 0xNNN` forms for software's introspective use until
(and if) RISC-V upstream defines something for that use case.
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Restructure the code under the assumption that there will be HINT consumers
other than TCG_LOG_INSTR.
Document the current and near-term allocations of the opcode space:
Move the TCG_LOG_INSTR tests to match rs1 == x0, which is the only form that
we have emitted, but we were never ignoring rs1.
Reserve
SLTI x0, x31, 0xNNNforms for software's introspective use until(and if) RISC-V upstream defines something for that use case.
XREF https://github.com/CTSRD-CHERI/cheri-architecture/pull/78