[Nasm-bugs] [Bug 3392656] New: "mov fs, ax" does not cause error when "cpu 8086" is in effect

noreply-nasm at dev.nasm.us noreply-nasm at dev.nasm.us
Thu Apr 2 03:06:59 PDT 2020


https://bugzilla.nasm.us/show_bug.cgi?id=3392656

            Bug ID: 3392656
           Summary: "mov fs, ax" does not cause error when "cpu 8086" is
                    in effect
           Product: NASM
           Version: 2.15 (development)
          Hardware: All
                OS: All
            Status: OPEN
          Severity: minor
          Priority: Medium
         Component: Assembler
          Assignee: nobody at nasm.us
          Reporter: pushbx at ulukai.org
                CC: chang.seok.bae at intel.com, gorcunov at gmail.com,
                    hpa at zytor.com, nasm-bugs at nasm.us
     Obtained from: Built from git using configure

$ cat test.asm 
        cpu 8086
        mov fs, ax
%ifdef ERROR
        mov eax, 1
%endif
$ nasm -v
NASM version 2.15rc0 compiled on Nov 22 2019
$ nasm test.asm 
$ nasm test.asm -DERROR
test.asm:4: error: no instruction for this cpu level
$ oldnasm -v
NASM version 2.12.02 compiled on Aug 10 2019
$ oldnasm test.asm 
$ oldnasm test.asm -DERROR
test.asm:4: error: no instruction for this cpu level
$

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