309 lines
5.0 KiB
HTML
309 lines
5.0 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<HTML
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><HEAD
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><TITLE
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>Basic arguments</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK
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REL="HOME"
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TITLE="Programming with Ophis"
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HREF="book1.html"><LINK
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REL="UP"
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TITLE="Ophis Command Reference"
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HREF="a505.html"><LINK
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REL="PREVIOUS"
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TITLE="Ophis Command Reference"
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HREF="a505.html"><LINK
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REL="NEXT"
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TITLE="Compound Arguments"
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HREF="x620.html"></HEAD
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><BODY
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SUMMARY="Header navigation table"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>Programming with Ophis</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="a505.html"
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ACCESSKEY="P"
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><<< Previous</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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>Ophis Command Reference</TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="x620.html"
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>Next >>></A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="SECTION"
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><H1
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CLASS="SECTION"
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><A
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NAME="AEN572"
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>Basic arguments</A
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></H1
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><P
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> Most arguments are just a number or label. The formats for
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these are below.
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</P
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><DIV
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CLASS="SECTION"
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><H2
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CLASS="SECTION"
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><A
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NAME="AEN575"
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>Numeric types</A
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></H2
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><P
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></P
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><UL
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><LI
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><P
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><I
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CLASS="EMPHASIS"
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>Hex:</I
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> <TT
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CLASS="LITERAL"
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>$41</TT
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> (Prefixed with $)</P
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></LI
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><LI
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><P
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><I
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CLASS="EMPHASIS"
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>Decimal:</I
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> <TT
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CLASS="LITERAL"
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>65</TT
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> (No markings)</P
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></LI
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><LI
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><P
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><I
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CLASS="EMPHASIS"
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>Octal:</I
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> <TT
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CLASS="LITERAL"
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>0101</TT
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> (Prefixed with zero)</P
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></LI
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><LI
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><P
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><I
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CLASS="EMPHASIS"
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>Binary:</I
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> <TT
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CLASS="LITERAL"
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>%01000001</TT
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> (Prefixed with %)</P
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></LI
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><LI
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><P
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><I
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CLASS="EMPHASIS"
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>Character:</I
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> <TT
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CLASS="LITERAL"
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>'A</TT
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> (Prefixed with single quote)</P
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></LI
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></UL
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></DIV
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><DIV
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CLASS="SECTION"
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><H2
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CLASS="SECTION"
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><A
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NAME="AEN598"
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>Label types</A
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></H2
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><P
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> Normal labels are simply referred to by name. Anonymous
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labels may be referenced with strings of - or + signs (the
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label <TT
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CLASS="LITERAL"
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>-</TT
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> refers to the immediate
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previous anonymous label, <TT
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CLASS="LITERAL"
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>--</TT
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> the
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one before that, etc., while <TT
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CLASS="LITERAL"
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>+</TT
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>
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refers to the next anonymous label), and the special
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label <TT
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CLASS="LITERAL"
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>^</TT
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> refers to the program
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counter at the start of the current instruction or directive.
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</P
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><P
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> Normal labels are <I
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CLASS="EMPHASIS"
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>defined</I
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> by
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prefixing a line with the label name and then a colon
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(e.g., <TT
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CLASS="LITERAL"
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>label:</TT
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>). Anonymous labels
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are defined by prefixing a line with an asterisk
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(e.g., <TT
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CLASS="LITERAL"
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>*</TT
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>).
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</P
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><P
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> Temporary labels are only reachable from inside the
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innermost enclosing <TT
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CLASS="LITERAL"
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>.scope</TT
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>
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statement. They are identical to normal labels in every
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way, except that they start with an underscore.
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</P
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></DIV
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><DIV
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CLASS="SECTION"
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><H2
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CLASS="SECTION"
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><A
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NAME="AEN611"
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>String types</A
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></H2
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><P
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> Strings are enclosed in double quotation marks. Backslashed
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characters (including backslashes and double quotes) are
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treated literally, so the string <TT
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CLASS="LITERAL"
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>"The man said,
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\"The \\ character is the backslash.\""</TT
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> produces
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the ASCII sequence for <TT
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CLASS="LITERAL"
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>The man said, "The \
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character is the backslash."</TT
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>
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</P
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><P
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> Strings are generally only used as arguments to assembler
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directives—usually for filenames
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(e.g., <TT
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CLASS="LITERAL"
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>.include</TT
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>) but also for string
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data (in association with <TT
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CLASS="LITERAL"
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>.byte</TT
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>).
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</P
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><P
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> It is legal, though unusual, to attempt to pass a string to
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the other data statements. This will produces a series of
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words/dwords where all bytes that aren't least-significant
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are zero. Endianness and size will match what the directive
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itself indicated.
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</P
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></DIV
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></DIV
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><DIV
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CLASS="NAVFOOTER"
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><HR
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ALIGN="LEFT"
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WIDTH="100%"><TABLE
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SUMMARY="Footer navigation table"
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WIDTH="100%"
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CELLSPACING="0"
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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><A
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HREF="a505.html"
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ACCESSKEY="P"
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><<< Previous</A
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></TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="book1.html"
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>Home</A
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></TD
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ALIGN="right"
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VALIGN="top"
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><A
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HREF="x620.html"
|
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ACCESSKEY="N"
|
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>Next >>></A
|
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></TD
|
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></TR
|
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><TR
|
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><TD
|
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WIDTH="33%"
|
|
ALIGN="left"
|
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VALIGN="top"
|
|
>Ophis Command Reference</TD
|
|
><TD
|
|
WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="a505.html"
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ACCESSKEY="U"
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>Up</A
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></TD
|
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><TD
|
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WIDTH="33%"
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ALIGN="right"
|
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VALIGN="top"
|
|
>Compound Arguments</TD
|
|
></TR
|
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></TABLE
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></DIV
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></BODY
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></HTML
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> |