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target/riscv: check misa value before reporting #1112

Merged
merged 1 commit into from
Sep 6, 2024
Merged

target/riscv: check misa value before reporting #1112

merged 1 commit into from
Sep 6, 2024

Commits on Sep 5, 2024

  1. target/riscv: check misa value before reporting 

    Currently, during register file examination:
1. A read of an XPR is attempted via 64-bit abstract access.
2. If such a read fails (e.g. connection unstable) XLEN is assumed to be
   32.
3. Then `misa` is read. Since `misa` is a CSR and it may be only
   readable via program buffer, `s0` should be readable beforehand (at
   least some assumption about `xlen` should be made).
4. Before the commit, the `misa.mxl` field was not checked against
   `xlen`, therefore erroneous info may have been reported to the user.
   Moreover, the `examine()` would pass indicating no error at all.
5. After the commit, `misa.mxl` is checked against `xlen` value.

Change-Id: I3fe5bd6742e564e6de782aad9ed10e65c0728923
Signed-off-by: Evgeniy Naydanov <evgeniy.naydanov@syntacore.com>
    @en-sc
    en-sc committed Sep 5, 2024
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