[Bug binutils/19661] New: [libopcodes] [x86] Lock prefixes are allowed even when they SIGILL

[njholcomb at wi dot rr.com]

https://sourceware.org/bugzilla/show_bug.cgi?id=19661

            Bug ID: 19661
           Summary: [libopcodes] [x86] Lock prefixes are allowed even when
                    they SIGILL
           Product: binutils
           Version: 2.27 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: njholcomb at wi dot rr.com
  Target Milestone: ---

Lock prefixes are also allowed even when they cause an Illegal Instruction
signal. Lock prefixes should require a memory operand, but libopcodes will
produce code like:

lock mov bh, 0x9f

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