[Bug binutils/30495] New: [libopcodes][riscv] ori x0, xn, imm decoded as incorrect instruction class causing gdb sim to terminate

[tommy_murphy at hotmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=30495

            Bug ID: 30495
           Summary: [libopcodes][riscv] ori x0, xn, imm decoded as
                    incorrect instruction class causing gdb sim to
                    terminate
           Product: binutils
           Version: 2.40
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: tommy_murphy at hotmail dot com
  Target Milestone: ---

Originally discussed here:

https://github.com/riscv-collab/riscv-gnu-toolchain/issues/1200

And then I filed it here but I guess that that was the wrong place:

https://sourceware.org/bugzilla/show_bug.cgi?id=30494

As far as I can see (and as outlined here:
https://github.com/riscv-collab/riscv-gnu-toolchain/issues/1200#issuecomment-1451965016)
the ori x0, xn, imm instruction is getting decoded as the wrong class
(INSN_CLASS_ZBC_OR_ZBKC instead of INSN_CLASS_I) and the simulator terminates
with an UNHANDLED_EXTENSION message.

If any additional info is needed please let me know - thanks.

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