|
285
|
1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
|
|
|
2 <HTML
|
|
|
3 ><HEAD
|
|
|
4 ><TITLE
|
|
|
5 >Object Files</TITLE
|
|
|
6 ><META
|
|
|
7 NAME="GENERATOR"
|
|
|
8 CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK
|
|
|
9 REL="HOME"
|
|
|
10 TITLE="LW Tool Chain"
|
|
|
11 HREF="index.html"><LINK
|
|
|
12 REL="UP"
|
|
|
13 TITLE="Output Formats"
|
|
|
14 HREF="c18.html"><LINK
|
|
|
15 REL="PREVIOUS"
|
|
|
16 TITLE="DECB Binaries"
|
|
|
17 HREF="x24.html"><LINK
|
|
|
18 REL="NEXT"
|
|
|
19 TITLE="LWASM"
|
|
|
20 HREF="c35.html"></HEAD
|
|
|
21 ><BODY
|
|
|
22 CLASS="SECTION"
|
|
|
23 BGCOLOR="#FFFFFF"
|
|
|
24 TEXT="#000000"
|
|
|
25 LINK="#0000FF"
|
|
|
26 VLINK="#840084"
|
|
|
27 ALINK="#0000FF"
|
|
|
28 ><DIV
|
|
|
29 CLASS="NAVHEADER"
|
|
|
30 ><TABLE
|
|
|
31 SUMMARY="Header navigation table"
|
|
|
32 WIDTH="100%"
|
|
|
33 BORDER="0"
|
|
|
34 CELLPADDING="0"
|
|
|
35 CELLSPACING="0"
|
|
|
36 ><TR
|
|
|
37 ><TH
|
|
|
38 COLSPAN="3"
|
|
|
39 ALIGN="center"
|
|
|
40 >LW Tool Chain</TH
|
|
|
41 ></TR
|
|
|
42 ><TR
|
|
|
43 ><TD
|
|
|
44 WIDTH="10%"
|
|
|
45 ALIGN="left"
|
|
|
46 VALIGN="bottom"
|
|
|
47 ><A
|
|
|
48 HREF="x24.html"
|
|
|
49 ACCESSKEY="P"
|
|
|
50 >Prev</A
|
|
|
51 ></TD
|
|
|
52 ><TD
|
|
|
53 WIDTH="80%"
|
|
|
54 ALIGN="center"
|
|
|
55 VALIGN="bottom"
|
|
|
56 >Chapter 2. Output Formats</TD
|
|
|
57 ><TD
|
|
|
58 WIDTH="10%"
|
|
|
59 ALIGN="right"
|
|
|
60 VALIGN="bottom"
|
|
|
61 ><A
|
|
|
62 HREF="c35.html"
|
|
|
63 ACCESSKEY="N"
|
|
|
64 >Next</A
|
|
|
65 ></TD
|
|
|
66 ></TR
|
|
|
67 ></TABLE
|
|
|
68 ><HR
|
|
|
69 ALIGN="LEFT"
|
|
|
70 WIDTH="100%"></DIV
|
|
|
71 ><DIV
|
|
|
72 CLASS="SECTION"
|
|
|
73 ><H1
|
|
|
74 CLASS="SECTION"
|
|
|
75 ><A
|
|
|
76 NAME="AEN29"
|
|
|
77 >2.3. Object Files</A
|
|
|
78 ></H1
|
|
|
79 ><P
|
|
|
80 >LWASM supports generating a proprietary object file format which is
|
|
|
81 described in <A
|
|
|
82 HREF="c701.html"
|
|
|
83 >Chapter 6</A
|
|
|
84 >. LWLINK is then used to link these
|
|
|
85 object files into a final binary in any of LWLINK's supported binary
|
|
|
86 formats.</P
|
|
|
87 ><P
|
|
|
88 >Object files are very flexible in that they allow references that are not
|
|
|
89 known at assembly time to be resolved at link time. However, because the
|
|
|
90 addresses of such references are not known, there is no way for the assembler
|
|
|
91 has to use sixteen bit addressing modes for these references. The linker
|
|
|
92 will always use sixteen bits when resolving a reference which means any
|
|
|
93 instruction that requires an eight bit operand cannot use external references.</P
|
|
|
94 ><P
|
|
|
95 >Object files also support the concept of sections which are not valid
|
|
|
96 for other output types. This allows related code from each object file
|
|
|
97 linked to be collapsed together in the final binary.</P
|
|
|
98 ></DIV
|
|
|
99 ><DIV
|
|
|
100 CLASS="NAVFOOTER"
|
|
|
101 ><HR
|
|
|
102 ALIGN="LEFT"
|
|
|
103 WIDTH="100%"><TABLE
|
|
|
104 SUMMARY="Footer navigation table"
|
|
|
105 WIDTH="100%"
|
|
|
106 BORDER="0"
|
|
|
107 CELLPADDING="0"
|
|
|
108 CELLSPACING="0"
|
|
|
109 ><TR
|
|
|
110 ><TD
|
|
|
111 WIDTH="33%"
|
|
|
112 ALIGN="left"
|
|
|
113 VALIGN="top"
|
|
|
114 ><A
|
|
|
115 HREF="x24.html"
|
|
|
116 ACCESSKEY="P"
|
|
|
117 >Prev</A
|
|
|
118 ></TD
|
|
|
119 ><TD
|
|
|
120 WIDTH="34%"
|
|
|
121 ALIGN="center"
|
|
|
122 VALIGN="top"
|
|
|
123 ><A
|
|
|
124 HREF="index.html"
|
|
|
125 ACCESSKEY="H"
|
|
|
126 >Home</A
|
|
|
127 ></TD
|
|
|
128 ><TD
|
|
|
129 WIDTH="33%"
|
|
|
130 ALIGN="right"
|
|
|
131 VALIGN="top"
|
|
|
132 ><A
|
|
|
133 HREF="c35.html"
|
|
|
134 ACCESSKEY="N"
|
|
|
135 >Next</A
|
|
|
136 ></TD
|
|
|
137 ></TR
|
|
|
138 ><TR
|
|
|
139 ><TD
|
|
|
140 WIDTH="33%"
|
|
|
141 ALIGN="left"
|
|
|
142 VALIGN="top"
|
|
|
143 >DECB Binaries</TD
|
|
|
144 ><TD
|
|
|
145 WIDTH="34%"
|
|
|
146 ALIGN="center"
|
|
|
147 VALIGN="top"
|
|
|
148 ><A
|
|
|
149 HREF="c18.html"
|
|
|
150 ACCESSKEY="U"
|
|
|
151 >Up</A
|
|
|
152 ></TD
|
|
|
153 ><TD
|
|
|
154 WIDTH="33%"
|
|
|
155 ALIGN="right"
|
|
|
156 VALIGN="top"
|
|
|
157 >LWASM</TD
|
|
|
158 ></TR
|
|
|
159 ></TABLE
|
|
|
160 ></DIV
|
|
|
161 ></BODY
|
|
|
162 ></HTML
|
|
|
163 > |
