At 11:02 PM 11/28/2005 -0800, Blair Campbell wrote:
I would personally really appreciate the ASM in FreeDOS HELP being a
test case, as this assembler won't even compile with Arrow Assembler
or the Watcom Assembler (which both use older MASM/TASM syntax,
afaik).
The only ASM file I found in FreeDOS HELP was conio.asm. It substantially
converted with Nomyso 2.0 as-is. There remained three problem areas: local
labels in macros, improper bracketing in certain circumstances, and DGROUP
group listing.
I fixed the local label in macro situation, and the DGROUP problem. The
bracketing was made a bit more robust. In doing so, I discovered an error
in the original Nomyso 2.0 for EMM386 which fortunately was minor: the
_pause macro which isn't used in normal build had a memory reference error,
and the very seldom used SB option code translated one line
improperly. Neither problem should affect people who would develop with a
translated EMM386, but they're fixed now for next Nomyso.
The bracket problem highlighted one of the fundamental reasons you can
never fully automate the translation process for all MASM/TASM source files
. With the line:
_ScreenArea EQU DWord Ptr _ScreenOffset
translated to:
%DEFINE _ScreenArea DWord [_ScreenOffset]
things will still fail under NASM for lines like:
les di, _ScreenArea
Why? Because NASM won't take a DWORD attribute for a 'les' argument, even
though it IS a DWORD being used. In fact, I tried different combinations
of DWORD, WORD, NEAR, and FAR, and NASM won't take any of them. I think
that's a bug in NASM, but I can't figure out what it really thinks it
should take as an attribute, so who knows.
The three people following to this point might wonder why Nomyso doesn't
just eliminate the 'DWord' in the $DEFINE statement and eliminate the
problem. Well, you can't automatically do that because the DWORD would be
necessary in some cases where you might use the %define'd _ScreenArea, such as:
mov eax,_ScreenArea
However, because I am insane, I added the ability to fully automate the
conio.asm conversion by adding a -x option to Nomyso, allowing
post-processing lines with s// regular expressions. Consequently, with the
current (unreleased) Nomyso:
./nomyso/pl -x'/(%define\s+.*\s)dword\s+(.*)/$1$2/i' conio.asm nconio.asm
conio.asm is fully translated and NASM ready following the problematic
DWord purge by that demented 'x' option. NASM -O99 -f obj nconio.asm is happy.
I can't say whether the translated conio.asm actually works along with all
its C source, but it does assemble without errors. If you want the latest
Nomyso immediately for converting conio.asm, let me know. Otherwise I'm
going to wait and see if the ATAPICD translation needs any non-major
changes to Nomyso before releasing a new public version.
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