Re: SPARC assembly - a beginner's question...

From: Jeff Damens (jdamens_at_ebbets.poly.edu)
Date: 06/26/03

  • Next message: Steve Wilson: "RE: SPARC assembly - a beginner's question..." 
    Date: Wed, 25 Jun 2003 19:18:16 -0400 (EDT)
To: S.Wilson@eris.qinetiq.com

    > Running my assembly code does not....

    > or %g0, %g0, [%fp-12] ! clear %fp-12
    ...
    > expanding "clr [%fp-12]" to "or %g0, %g0, [%fp-12]"

    I think this is where the problem lies. I don't believe there is an
    addressing mode which lets you or two registers into a memory
    location. I think the 'clr' pseudo-op actually expands to
            st %g0, [%fp-12]

    (g0 is assumed to contain 0 always).

    > If I load the binary into gdb and take a look, a lot of it seems to be
    > missing:

    Ahhh...

    > set 0x2F736800, %o0 ! %o0=/sh\0

    The \0 terminates the string literal being passed to __asm__ !!!

    This may explain why it didn't complain about the or %g0, %g0, [%fp-12].

    I hope this helps...

    Regards,

    Jeff

    ----------------------------------------------------------------

    Jeff Damens Unix Systems Administrator
    Polytechnic University jdamens@poly.edu
    6 Metrotech (718) 260-3492
    Brooklyn, New York 11201

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