Add Zicfilp extension #361
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It should not take 15 commits like that to add this extension. Please condense into a sensible history. |
The part that Jessica didn't make explicit is: we use a "rebase and merge" strategy and don't squash your history when merging, so your history should be considered part of the submission. |
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Sorry, that the commit history was nonsense. I have squashed some of the commits. Let me know if it makes sense now. |
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- Add machine security configuration register - mseccfg - Legalize menvcfg and senvcfg separately. Some fields of senvcfg are modulated by menvcfg. - Make mstatush writeable and add a legalizer function for it.
- mstatus : MPELP, SPELP - menvcfg : LPE - senvcfg : LPE
- JALR updates ELP to LP expected on indirect call/jump - Traps preserve ELP state in mstatus.xPELP on trap delivery priv x - xRET restores ELP from mstatus.xPELP - If instruction fetched not LPAD when ELP is LP_EXPECTED cause SW check fault
- Add elp state register and its initialization - xLPE to track if landing pads enabled at priv x - Functions that implement ELP state management - LPAD instruction
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Specification: https://github.com/riscv/riscv-cfi/blob/main/cfi_forward.adoc
Tests: riscv-non-isa/riscv-arch-test#413