Assembler error

This is a discussion on Assembler error within the Linux Programming forums, part of the Platform Specific Boards category; I wrote a kernel module for a character device however, when I try to compile it I get an assembler ...

  1. #1
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    Assembler error

    I wrote a kernel module for a character device however, when I try to compile it I get an assembler error, could this be a problem of the code or is it internal?

    Code:
    beg_g@pop:~ > make
    gcc -Wall -DMODULE -D__KERNEL__ -DLINUX -c char.c -I/lib/modules/`uname
    -r`/build/include
    /tmp/ccaELEEv.s: Assembler messages:
    /tmp/ccaELEEv.s:219: Error: `%al' not allowed with `movl'
    make: *** [char.o] Error 1
    Any help would be highly appreciated.

    Gerald
    -------------------------
    Gerald.

  2. #2
    Blank
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    I think you want to use movw.

  3. #3
    Registered User alex's Avatar
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    No, movb.

    movl expects a 32 bit register (%eax for example)
    movw expects a 16 bit register (%ax)
    movb expects a 8 bit register (%al, %ah)

    easy, isn't it?

    (it is if you remember that b -> byte, w -> word, l -> longword)

    alex

  4. #4
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    Yea, I use nasm if I do any assembly so I don't have that problem .

  5. #5
    Registered User alex's Avatar
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    Unhappy

    But gcc doesn't accept nasm-like-syntax in inline assembly...

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