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Add Zicfilp extension #361

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Add Zicfilp extension #361

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Commits on Jun 22, 2024

  1. Update CSRs infrastructure 

    - 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.
    @ved-rivos
    ved-rivos committed Jun 22, 2024
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  2. Add fields introduced by Zicfilp in existing CSRs 

    - mstatus : MPELP, SPELP
- menvcfg : LPE
- senvcfg : LPE
    @ved-rivos
    ved-rivos committed Jun 22, 2024
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  3. add software check exception

    @ved-rivos
    ved-rivos committed Jun 22, 2024
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  4. Expected Landing Pad (ELP) state management 

    - 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
    @ved-rivos
    ved-rivos committed Jun 22, 2024
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  5. Add Zicfilp register state and flows 

    - 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
    @ved-rivos
    ved-rivos committed Jun 22, 2024
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