That would be a good assumption @bsvtgc
As Bruce mentions, the FE310-G002 SoC does indeed have User Mode, as noted in the FE310-G002 Manual (v19p04):
The E31 supports RISC‐V user mode, providing two levels of privilege: machine (M) and user (U). U-mode provides a mechanism to isolate application processes from each other and from trusted code running in M-mode.
An earlier draft of the Privileged Spec (v1.10) shows the User-level ustatus, uie, and utvec CSR’s in Table 2.2 on page 9. These have since been removed in the latest Privileged Spec (v1.12, 2021-12-03), where User-mode has been renamed to “unprivileged”; see Table 2.2 on page 8.
Section 1.6 (Exceptions, Traps, and Interrupts) of the Unprivileged Spec, especially Table 1.1, gives some description of trap handling in U-mode.