[should rebase & merge] 6 commits for align nemu with nutshell - #286

Merged

poemonsense merged 6 commits into

Sep 22, 2026

Commits on Sep 21, 2026

CSR: drop unimplemented PMP registers
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committed
fd33836
CSR: fix medeleg write mask
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88ce23e
CSR: write ebreak PC into xtval
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6e4bf5a
CSR: keep CY/TM/IR writable in counteren
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b5ba679
CSR: add menvcfg and senvcfg as read-only zero
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48608f6
ready-to-run: bump nemu-so
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b5a88a1