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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><HTML><HEAD> <META NAME="GENERATOR" CONTENT="LinuxDoc-Tools 0.9.20"> <TITLE>da65 Users Guide: Detailed workings</TITLE> <LINK HREF="da65-4.html" REL=next> <LINK HREF="da65-2.html" REL=previous> <LINK HREF="da65.html#toc3" REL=contents></HEAD><BODY><A HREF="da65-4.html">Next</A><A HREF="da65-2.html">Previous</A><A HREF="da65.html#toc3">Contents</A><HR><H2><A NAME="s3">3.</A> <A HREF="da65.html#toc3">Detailed workings</A></H2><H2><A NAME="ss3.1">3.1</A> <A HREF="da65.html#toc3.1">Supported CPUs</A></H2><P>The default (no CPU given on the command line or in the <CODE>GLOBAL</CODE> section ofthe info file) is the 6502 CPU. The disassembler knows all "official" opcodesfor this CPU. Invalid opcodes are translated into <CODE>.byte</CODE> commands.</P><P>With the command line option <CODE><A HREF="da65-2.html#option--cpu">--cpu</A></CODE>, thedisassembler may be told to recognize either the 65SC02 or 65C02 CPUs. Thelatter understands the same opcodes as the former, plus 16 additional bitmanipulation and bit test-and-branch commands.</P><P>While there is some code for the 65816 in the sources, it is currentlyunsupported.</P><H2><A NAME="ss3.2">3.2</A> <A HREF="da65.html#toc3.2">Attribute map</A></H2><P>The disassembler works by creating an attribute map for the whole addressspace ($0000 - $FFFF). Initially, all attributes are cleared. Then, anexternal info file (if given) is read. Disassembly is done in several passes.In all passes with the exception of the last one, information about thedisassembled code is gathered and added to the symbol and attribute maps. Thelast pass generates output using the information from the maps.</P><H2><A NAME="ss3.3">3.3</A> <A HREF="da65.html#toc3.3">Labels</A></H2><P>Some instructions may generate labels in the first pass, while most otherinstructions do not generate labels, but use them if they are available. Amongothers, the branch and jump instructions will generate labels for the targetof the branch in the first pass. External labels (taken from the info file)have precedence over internally generated ones, They must be valid identifiersas specified for the ca65 assembler. Internal labels (generated by thedisassembler) have the form <CODE>Labcd</CODE>, where <CODE>abcd</CODE> is the hexadecimaladdress of the label in upper case letters. You should probably avoid usingsuch label names for external labels.</P><H2><A NAME="ss3.4">3.4</A> <A HREF="da65.html#toc3.4">Info File</A></H2><P>The info file is used to pass additional information about the input code tothe disassembler. This includes label names, data areas or tables, and globaloptions like input and output file names. See the <A HREF="da65-4.html#infofile">next section</A> for more information.</P><HR><A HREF="da65-4.html">Next</A><A HREF="da65-2.html">Previous</A><A HREF="da65.html#toc3">Contents</A></BODY></HTML>⌨️ 快捷键说明
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