[LLVMbugs] [Bug 8684] New: [MC assembler] .code16 not supported

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=8684

           Summary: [MC assembler] .code16 not supported
           Product: new-bugs
           Version: trunk
          Platform: PC
        OS/Version: FreeBSD
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: dimitry at andric.com
                CC: llvmbugs at cs.uiuc.edu


In FreeBSD, we have a few scattered pieces of 16-bit x86 assembly in the
tree, since these run in real mode; this mostly concerns boot loader
parts, but there is also at least one ACPI-related chunk (wakeup code).

Most of these are delineated with .code16 directives, but I see at least
one file that just consists of 'pure' 16-bit code.  This causes the
integrated assembler to choke with e.g.:

sio.s:46:17: error: invalid operand for instruction
sio_putc.1: inb (%dx),%al # Transmitter
                ^
sio.s:48:3: error: invalid instruction mnemonic 'loopz'
  loopz sio_putc.1 # No
  ^
sio.s:60:7: error: invalid operand for instruction
  inb (%dx),%al # Read character
      ^
sio.s:67:7: error: invalid operand for instruction
  inb (%dx),%al # Received data
      ^

This issue might also be shoved into bug 8595, but I guess 16 bit is
code is a rather different can of worms...  Though it is still necessary
in 2010, apparently. :)

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