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annotate doc/manual.docbook.sgml @ 227:4c60c3a09597
Various updates to the manual
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date | Fri, 12 Jun 2009 00:06:24 +0000 |
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109 | 1 <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook V4.5//EN"> |
2 <book> | |
3 <bookinfo> | |
4 <title>LW Tool Chain</title> | |
5 <author><firstname>William</firstname><surname>Astle</surname></author> | |
6 <copyright><year>2009</year><holder>William Astle</holder></copyright> | |
7 </bookinfo> | |
8 <chapter> | |
9 | |
10 <title>Introduction</title> | |
11 | |
12 <para> | |
13 The LW tool chain provides utilities for building binaries for MC6809 and | |
14 HD6309 CPUs. The tool chain includes a cross-assembler and a cross-linker | |
15 which support several styles of output. | |
16 </para> | |
17 | |
18 <section> | |
19 <title>History</title> | |
20 <para> | |
21 For a long time, I have had an interest in creating an operating system for | |
22 the Coco3. I finally started working on that project around the beginning of | |
23 2006. I had a number of assemblers I could choose from. Eventually, I settled | |
24 on one and started tinkering. After a while, I realized that assembler was not | |
25 going to be sufficient due to lack of macros and issues with forward references. | |
26 Then I tried another which handled forward references correctly but still did | |
27 not support macros. I looked around at other assemblers and they all lacked | |
28 one feature or another that I really wanted for creating my operating system. | |
29 </para> | |
30 | |
31 <para> | |
32 The solution seemed clear at that point. I am a fair programmer so I figured | |
33 I could write an assembler that would do everything I wanted an assembler to | |
34 do. Thus the LWASM probject was born. After more than two years of on and off | |
35 work, version 1.0 of LWASM was released in October of 2008. | |
36 </para> | |
37 | |
38 <para> | |
39 As the aforementioned operating system project progressed further, it became | |
40 clear that while assembling the whole project through a single file was doable, | |
41 it was not practical. When I found myself playing some fancy games with macros | |
42 in a bid to simulate sections, I realized I needed a means of assembling | |
43 source files separately and linking them later. This spawned a major development | |
44 effort to add an object file support to LWASM. It also spawned the LWLINK | |
45 project to provide a means to actually link the files. | |
46 </para> | |
47 | |
48 </section> | |
49 | |
50 </chapter> | |
51 | |
52 <chapter> | |
53 <title>Output Formats</title> | |
54 | |
55 <para> | |
56 The LW tool chain supports multiple output formats. Each format has its | |
57 advantages and disadvantages. Each format is described below. | |
58 </para> | |
59 | |
60 <section> | |
61 <title>Raw Binaries</title> | |
62 <para> | |
63 A raw binary is simply a string of bytes. There are no headers or other | |
64 niceties. Both LWLINK and LWASM support generating raw binaries. ORG directives | |
65 in the source code only serve to set the addresses that will be used for | |
66 symbols but otherwise have no direct impact on the resulting binary. | |
67 </para> | |
68 | |
69 </section> | |
70 <section> | |
71 <title>DECB Binaries</title> | |
72 | |
73 <para>A DECB binary is compatible with the LOADM command in Disk Extended | |
74 Color Basic on the CoCo. They are also compatible with CLOADM from Extended | |
75 Color Basic. These binaries include the load address of the binary as well | |
76 as encoding an execution address. These binaries may contain multiple loadable | |
77 sections, each of which has its own load address.</para> | |
78 | |
79 <para> | |
80 Each binary starts with a preamble. Each preamble is five bytes long. The | |
81 first byte is zero. The next two bytes specify the number of bytes to load | |
82 and the last two bytes specify the address to load the bytes at. Then, a | |
83 string of bytes follows. After this string of bytes, there may be another | |
84 preamble or a postamble. A postamble is also five bytes in length. The first | |
85 byte of the postamble is $FF, the next two are zero, and the last two are | |
86 the execution address for the binary. | |
87 </para> | |
88 | |
89 <para> | |
90 Both LWASM and LWLINK can output this format. | |
91 </para> | |
92 </section> | |
93 | |
94 <section> | |
95 <title>Object Files</title> | |
96 <para>LWASM supports generating a proprietary object file format which is | |
97 described in <xref linkend="objchap">. LWLINK is then used to link these | |
98 object files into a final binary in any of LWLINK's supported binary | |
99 formats.</para> | |
100 | |
101 <para>Object files also support the concept of sections which are not valid | |
102 for other output types. This allows related code from each object file | |
103 linked to be collapsed together in the final binary.</para> | |
104 | |
227 | 105 <para> |
106 Object files are very flexible in that they allow references that are not | |
107 known at assembly time to be resolved at link time. However, because the | |
108 addresses of such references are not known at assembly time, there is no way | |
109 for the assembler to deduce that an eight bit addressing mode is possible. | |
110 That means the assember will default to using sixteen bit addressing | |
111 whenever an external or cross-section reference is used. | |
112 </para> | |
113 | |
114 <para> | |
115 As of LWASM 2.4, it is possible to force direct page addressing for an | |
116 external reference. Care must be taken to ensure the resulting addresses | |
117 are really in the direct page since the linker does not know what the direct | |
118 page is supposed to be and does not emit errors for byte overflows. | |
119 </para> | |
120 | |
121 <para> | |
122 It is also possible to use external references in an eight bit immediate | |
123 mode instruction. In this case, only the low order eight bits will be used. | |
124 Again, no byte overflows will be flagged. | |
125 </para> | |
126 | |
127 | |
109 | 128 </section> |
129 | |
130 </chapter> | |
131 | |
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132 <chapter> |
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133 <title>LWASM</title> |
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134 <para> |
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135 The LWTOOLS assembler is called LWASM. This chapter documents the various |
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136 features of the assembler. It is not, however, a tutorial on 6x09 assembly |
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137 language programming. |
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138 </para> |
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139 |
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140 <section> |
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141 <title>Command Line Options</title> |
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142 <para> |
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143 The binary for LWASM is called "lwasm". Note that the binary is in lower |
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144 case. lwasm takes the following command line arguments. |
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145 </para> |
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146 |
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147 <variablelist> |
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148 <varlistentry> |
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149 <term><option>--decb</option></term> |
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150 <term><option>-b</option></term> |
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151 <listitem> |
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152 <para> |
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153 Select the DECB output format target. Equivalent to <option>--format=decb</option>. |
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154 </para> |
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155 </listitem> |
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156 </varlistentry> |
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157 |
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158 <varlistentry> |
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159 <term><option>--format=type</option></term> |
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160 <term><option>-f type</option></term> |
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161 <listitem> |
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162 <para> |
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163 Select the output format. Valid values are <option>obj</option> for the object |
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164 file target, <option>decb</option> for the DECB LOADM format, and <option>raw</option> |
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165 for a raw binary. |
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166 </para> |
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167 </listitem> |
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168 </varlistentry> |
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169 |
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170 <varlistentry> |
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171 <term><option>--list[=file]</option></term> |
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172 <term><option>-l[file]</option></term> |
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173 <listitem> |
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174 <para> |
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175 Cause LWASM to generate a listing. If <option>file</option> is specified, |
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176 the listing will go to that file. Otherwise it will go to the standard output |
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177 stream. By default, no listing is generated. |
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178 </para> |
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179 </listitem> |
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180 </varlistentry> |
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181 |
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182 <varlistentry> |
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183 <term><option>--obj</option></term> |
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184 <listitem> |
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185 <para> |
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186 Select the proprietary object file format as the output target. |
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187 </para> |
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188 </listitem> |
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189 </varlistentry> |
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190 |
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191 <varlistentry> |
150 | 192 <term><option>--output=FILE</option></term> |
193 <term><option>-o FILE</option></term> | |
194 <listitem> | |
195 <para> | |
196 This option specifies the name of the output file. If not specified, the | |
197 default is <option>a.out</option>. | |
198 </para> | |
199 </listitem> | |
200 </varlistentry> | |
201 | |
202 <varlistentry> | |
145
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203 <term><option>--pragma=pragma</option></term> |
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204 <term><option>-p pragma</option></term> |
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205 <listitem> |
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206 <para> |
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207 Specify assembler pragmas. Multiple pragmas are separated by commas. The |
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208 pragmas accepted are the same as for the PRAGMA assembler directive described |
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209 below. |
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210 </para> |
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211 </listitem> |
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212 </varlistentry> |
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213 |
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214 <varlistentry> |
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215 <term><option>--raw</option></term> |
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216 <term><option>-r</option></term> |
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217 <listitem> |
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218 <para> |
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219 Select raw binary as the output target. |
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220 </para> |
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221 </listitem> |
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222 </varlistentry> |
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223 |
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224 <varlistentry> |
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225 <term><option>--help</option></term> |
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226 <term><option>-?</option></term> |
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227 <listitem> |
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228 <para> |
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229 Present a help screen describing the command line options. |
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230 </para> |
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231 </listitem> |
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232 </varlistentry> |
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233 |
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234 <varlistentry> |
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235 <term><option>--usage</option></term> |
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236 <listitem> |
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237 <para> |
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238 Provide a summary of the command line options. |
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239 </para> |
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240 </listitem> |
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241 </varlistentry> |
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242 |
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243 <varlistentry> |
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244 <term><option>--version</option></term> |
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245 <term><option>-V</option></term> |
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246 <listitem> |
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247 <para> |
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248 Display the software version. |
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249 </para> |
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250 </listitem> |
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251 </varlistentry> |
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252 |
146
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253 <varlistentry> |
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254 <term><option>--debug</option></term> |
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255 <term><option>-d</option></term> |
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256 <listitem> |
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257 <para> |
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258 Increase the debugging level. Only really useful to people hacking on the |
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259 LWASM source code itself. |
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260 </para> |
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261 </listitem> |
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262 </varlistentry> |
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263 |
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264 </variablelist> |
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265 |
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266 </section> |
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267 |
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268 <section> |
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269 <title>Dialects</title> |
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270 <para> |
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271 LWASM supports all documented MC6809 instructions as defined by Motorola. |
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272 It also supports all known HD6309 instructions. There is some variation, |
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273 however, in the pneumonics used for the block transfer instructions. LWASM |
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274 uses TFM for all four of them as do several other assemblers. Others, such |
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275 as CCASM, use four separate opcodes for it (compare: copy+, copy-, implode, |
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276 and explode). There are advantages to both methods. However, it seems like |
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277 TFM has the most traction and thus, this is what LWASM supports. Support |
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278 for such variations may be added in the future. |
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279 </para> |
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280 |
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281 <para> |
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282 The standard addressing mode specifiers are supported. These are the |
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283 hash sign ("#") for immediate mode, the less than sign ("<") for forced |
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284 eight bit modes, and the greater than sign (">") for forced sixteen bit modes. |
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285 </para> |
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286 |
167 | 287 <para> |
288 Additionally, LWASM supports using the asterisk ("*") to indicate | |
289 base page addressing. This should not be used in hand-written source code, | |
290 however, because it is non-standard and may or may not be present in future | |
291 versions of LWASM. | |
292 </para> | |
293 | |
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294 </section> |
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295 |
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296 <section> |
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297 <title>Source Format</title> |
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298 |
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299 <para> |
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300 LWASM accepts plain text files in a relatively free form. It can handle |
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301 lines terminated with CR, LF, CRLF, or LFCR which means it should be able |
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302 to assemble files on any platform on which it compiles. |
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303 </para> |
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304 <para> |
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305 Each line may start with a symbol. If a symbol is present, there must not |
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306 be any whitespace preceding it. It is legal for a line to contain nothing |
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307 but a symbol.</para> |
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308 <para> |
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309 The op code is separated from the symbol by whitespace. If there is |
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310 no symbol, there must be at least one white space character preceding it. |
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311 If applicable, the operand follows separated by whitespace. Following the |
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312 opcode and operand is an optional comment. |
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313 </para> |
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314 <para> |
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315 A comment can also be introduced with a * or a ;. The comment character is |
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316 optional for end of statement comments. However, if a symbol is the only |
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317 thing present on the line other than the comment, the comment character is |
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318 mandatory to prevent the assembler from interpreting the comment as an opcode. |
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319 </para> |
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320 |
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321 <para> |
175 | 322 For compatibility with the output generated by some C preprocessors, LWASM |
323 will also ignore lines that begin with a #. This should not be used as a general | |
324 comment character, however. | |
325 </para> | |
326 | |
327 <para> | |
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328 The opcode is not treated case sensitively. Neither are register names in |
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329 the operand fields. Symbols, however, are case sensitive. |
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330 </para> |
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331 |
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332 <para> |
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333 LWASM does not support line numbers in the file. |
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334 </para> |
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335 |
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336 </section> |
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337 |
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338 <section> |
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339 <title>Symbols</title> |
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340 |
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341 <para> |
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342 Symbols have no length restriction. They may contain letters, numbers, dots, |
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343 dollar signs, and underscores. They must start with a letter, dot, or |
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344 underscore. |
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345 </para> |
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346 |
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347 <para> |
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348 LWASM also supports the concept of a local symbol. A local symbol is one |
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349 which contains either a "?" or a "@", which can appear anywhere in the symbol. |
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350 The scope of a local symbol is determined by a number of factors. First, |
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351 each included file gets its own local symbol scope. A blank line will also |
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352 be considered a local scope barrier. Macros each have their own local symbol |
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353 scope as well (which has a side effect that you cannot use a local symbol |
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354 as an argument to a macro). There are other factors as well. In general, |
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355 a local symbol is restricted to the block of code it is defined within. |
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356 </para> |
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357 |
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358 </section> |
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359 |
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360 <section> |
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361 <title>Numbers and Expressions</title> |
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362 <para> |
175 | 363 |
364 Numbers can be expressed in binary, octal, decimal, or hexadecimal. Binary | |
365 numbers may be prefixed with a "%" symbol or suffixed with a "b" or "B". | |
366 Octal numbers may be prefixed with "@" or suffixed with "Q", "q", "O", or | |
367 "o". Hexadecimal numbers may be prefixed with "$", "0x" or "0X", or suffixed | |
368 with "H". No prefix or suffix is required for decimal numbers but they can | |
369 be prefixed with "&" if desired. Any constant which begins with a letter | |
370 must be expressed with the correct prefix base identifier or be prefixed | |
371 with a 0. Thus hexadecimal FF would have to be written either 0FFH or $FF. | |
372 Numbers are not case sensitive. | |
373 | |
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374 </para> |
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375 |
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376 <para> A symbol may appear at any point where a number is acceptable. The |
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377 special symbol "*" can be used to represent the starting address of the |
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378 current source line within expressions. </para> |
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379 |
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380 <para>The ASCII value of a character can be included by prefixing it with a |
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381 single quote ('). The ASCII values of two characters can be included by |
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382 prefixing the characters with a quote (").</para> |
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383 |
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384 <para> |
227 | 385 |
386 LWASM supports the following basic binary operators: +, -, *, /, and %. | |
387 These represent addition, subtraction, multiplication, division, and | |
388 modulus. It also supports unary negation and unary 1's complement (- and ^ | |
389 respectively). It is also possible to use ~ for the unary 1's complement | |
390 operator. For completeness, a unary positive (+) is supported though it is | |
391 a no-op. LWASM also supports using |, &, and ^ for bitwise or, bitwise and, | |
392 and bitwise exclusive or respectively. | |
393 | |
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394 </para> |
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395 |
227 | 396 <para> |
397 | |
398 Operator precedence follows the usual rules. Multiplication, division, and | |
399 modulus take precedence over addition and subtraction. Unary operators take | |
400 precedence over binary operators. Bitwise operators are lower precdence | |
401 than addition and subtraction. To force a specific order of evaluation, | |
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402 parentheses can be used in the usual manner. |
227 | 403 |
145
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404 </para> |
227 | 405 |
406 <para> | |
407 | |
408 As of LWASM 2.5, the operators && and || are recognized for boolean and and | |
409 boolean or respectively. They will return either 0 or 1 (false or true). | |
410 They have the lowest precedence of all the binary operators. | |
411 | |
412 </para> | |
413 | |
145
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414 </section> |
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415 |
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416 <section> |
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417 <title>Assembler Directives</title> |
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418 <para> |
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419 Various directives can be used to control the behaviour of the |
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420 assembler or to include non-code/data in the resulting output. Those directives |
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421 that are not described in detail in other sections of this document are |
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422 described below. |
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423 </para> |
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424 |
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425 <section> |
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426 <title>Data Directives</title> |
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427 <variablelist> |
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428 <varlistentry><term>FCB <parameter>expr[,...]</parameter></term> |
167 | 429 <term>.DB <parameter>expr[,...]</parameter></term> |
430 <term>.BYTE <parameter>expr[,...]</parameter></term> | |
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431 <listitem> |
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432 <para>Include one or more constant bytes (separated by commas) in the output.</para> |
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433 </listitem> |
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434 </varlistentry> |
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435 |
167 | 436 <varlistentry> |
437 <term>FDB <parameter>expr[,...]</parameter></term> | |
438 <term>.DW <parameter>expr[,...]</parameter></term> | |
439 <term>.WORD <parameter>expr[,...]</parameter></term> | |
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440 <listitem> |
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441 <para>Include one or more words (separated by commas) in the output.</para> |
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442 </listitem> |
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443 </varlistentry> |
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444 |
167 | 445 <varlistentry> |
446 <term>FQB <parameter>expr[,...]</parameter></term> | |
447 <term>.QUAD <parameter>expr[,...]</parameter></term> | |
448 <term>.4BYTE <parameter>expr[,...]</parameter></term> | |
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449 <listitem> |
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450 <para>Include one or more double words (separated by commas) in the output.</para> |
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451 </listitem> |
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452 </varlistentry> |
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453 |
167 | 454 <varlistentry> |
455 <term>FCC <parameter>string</parameter></term> | |
456 <term>.ASCII <parameter>string</parameter></term> | |
457 <term>.STR <parameter>string</parameter></term> | |
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458 <listitem> |
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459 <para> |
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460 Include a string of text in the output. The first character of the operand |
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461 is the delimiter which must appear as the last character and cannot appear |
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462 within the string. The string is included with no modifications> |
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463 </para> |
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464 </listitem> |
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465 </varlistentry> |
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466 |
167 | 467 <varlistentry> |
468 <term>FCN <parameter>string</parameter></term> | |
469 <term>.ASCIZ <parameter>string</parameter></term> | |
470 <term>.STRZ <parameter>string</parameter></term> | |
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471 <listitem> |
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472 <para> |
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473 Include a NUL terminated string of text in the output. The first character of |
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474 the operand is the delimiter which must appear as the last character and |
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475 cannot appear within the string. A NUL byte is automatically appended to |
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476 the string. |
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477 </para> |
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478 </listitem> |
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479 </varlistentry> |
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480 |
167 | 481 <varlistentry> |
482 <term>FCS <parameter>string</parameter></term> | |
483 <term>.ASCIS <parameter>string</parameter></term> | |
484 <term>.STRS <parameter>string</parameter></term> | |
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485 <listitem> |
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486 <para> |
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487 Include a string of text in the output with bit 7 of the final byte set. The |
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488 first character of the operand is the delimiter which must appear as the last |
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489 character and cannot appear within the string. |
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490 </para> |
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491 </listitem> |
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492 </varlistentry> |
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493 |
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494 <varlistentry><term>ZMB <parameter>expr</parameter></term> |
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495 <listitem> |
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496 <para> |
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497 Include a number of NUL bytes in the output. The number must be fully resolvable |
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498 during pass 1 of assembly so no forward or external references are permitted. |
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499 </para> |
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500 </listitem> |
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501 </varlistentry> |
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502 |
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503 <varlistentry><term>ZMD <parameter>expr</parameter></term> |
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504 <listitem> |
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505 <para> |
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506 Include a number of zero words in the output. The number must be fully |
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507 resolvable during pass 1 of assembly so no forward or external references are |
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508 permitted. |
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509 </para> |
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510 </listitem> |
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511 </varlistentry> |
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512 |
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513 <varlistentry><term>ZMQ <parameter>expr<parameter></term> |
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514 <listitem> |
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515 <para> |
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516 Include a number of zero double-words in the output. The number must be fully |
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517 resolvable during pass 1 of assembly so no forward or external references are |
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518 permitted. |
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519 </para> |
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520 </listitem> |
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521 </varlistentry> |
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522 |
167 | 523 <varlistentry> |
524 <term>RMB <parameter>expr</parameter></term> | |
525 <term>.BLKB <parameter>expr</parameter></term> | |
526 <term>.DS <parameter>expr</parameter></term> | |
527 <term>.RS <parameter>expr</parameter></term> | |
145
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528 <listitem> |
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529 <para> |
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530 Reserve a number of bytes in the output. The number must be fully resolvable |
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531 during pass 1 of assembly so no forward or external references are permitted. |
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532 The value of the bytes is undefined. |
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533 </para> |
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534 </listitem> |
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535 </varlistentry> |
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536 |
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537 <varlistentry><term>RMD <parameter>expr</parameter></term> |
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538 <listitem> |
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539 <para> |
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540 Reserve a number of words in the output. The number must be fully |
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541 resolvable during pass 1 of assembly so no forward or external references are |
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542 permitted. The value of the words is undefined. |
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543 </para> |
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544 </listitem> |
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545 </varlistentry> |
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546 |
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547 <varlistentry><term>RMQ <parameter>expr</parameter></term> |
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548 <listitem> |
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549 <para> |
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550 Reserve a number of double-words in the output. The number must be fully |
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551 resolvable during pass 1 of assembly so no forward or external references are |
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552 permitted. The value of the double-words is undefined. |
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553 </para> |
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554 </listitem> |
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555 </varlistentry> |
227 | 556 |
557 <varlistentry> | |
558 <term>INCLUDEBIN <parameter>filename</parameter></term> | |
559 <listitem> | |
560 <para> | |
561 Treat the contents of <parameter>filename</parameter> as a string of bytes to | |
562 be included literally at the current assembly point. This has the same effect | |
563 as converting the file contents to a series of FCB statements and including | |
564 those at the current assembly point. | |
565 </para> | |
566 </listitem> | |
567 </varlistentry> | |
568 | |
145
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569 </variablelist> |
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570 |
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571 </section> |
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572 |
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573 <section> |
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574 <title>Address Definition</title> |
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575 <para>The directives in this section all control the addresses of symbols |
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576 or the assembly process itself.</para> |
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577 |
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578 <variablelist> |
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579 <varlistentry><term>ORG <parameter>expr</parameter></term> |
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580 <listitem> |
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581 <para>Set the assembly address. The address must be fully resolvable on the |
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582 first pass so no external or forward references are permitted. ORG is not |
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583 permitted within sections when outputting to object files. For the DECB |
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584 target, each ORG directive after which output is generated will cause |
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585 a new preamble to be output. ORG is only used to determine the addresses |
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586 of symbols when the raw target is used. |
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587 </para> |
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588 </listitem> |
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589 </varlistentry> |
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590 |
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591 <varlistentry> |
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592 <term><parameter>sym</parameter> EQU <parameter>expr</parameter></term> |
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593 <term><parameter>sym</parameter> = <parameter>expr</parameter></term> |
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594 <listitem> |
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595 <para>Define the value of <parameter>sym</parameter> to be <parameter>expr</parameter>. |
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596 </listitem> |
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597 </varlistentry> |
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598 |
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599 <varlistentry> |
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600 <term><parameter>sym</parameter> SET <parameter>expr</parameter></term> |
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601 <listitem> |
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602 <para>Define the value of <parameter>sym</parameter> to be <parameter>expr</parameter>. |
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603 Unlike EQU, SET permits symbols to be defined multiple times as long as SET |
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604 is used for all instances. Use of the symbol before the first SET statement |
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605 that sets its value is undefined.</para> |
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606 </listitem> |
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607 </varlistentry> |
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608 |
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609 <varlistentry> |
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610 <term>SETDP <parameter>expr</parameter></term> |
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611 <listitem> |
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612 <para>Inform the assembler that it can assume the DP register contains |
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613 <parameter>expr</parameter>. This directive is only advice to the assembler |
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614 to determine whether an address is in the direct page and has no effect |
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615 on the contents of the DP register. The value must be fully resolved during |
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616 the first assembly pass because it affects the sizes of subsequent instructions. |
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617 </para> |
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618 <para>This directive has no effect in the object file target. |
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619 </para> |
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620 </listitem> |
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621 </varlistentry> |
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622 |
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623 <varlistentry> |
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624 <term>ALIGN <parameter>expr</parameter></term> |
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625 <listitem> |
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626 <para>Force the current assembly address to be a multiple of <parameter>expr</parameter>. |
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627 A series of NUL bytes is output to force the alignment, if required. The |
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628 alignment value must be fully resolved on the first pass because it affects |
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629 the addresses of subsquent instructions.</para> |
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630 <para>This directive is not suitable for inclusion in the middle of actual |
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631 code. It is intended to appear where the bytes output will not be executed. |
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632 </para> |
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633 </listitem> |
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634 </varlistentry> |
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635 |
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636 </variablelist> |
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637 |
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638 </section> |
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639 |
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640 <section> |
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641 <title>Conditional Assembly</title> |
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642 <para> |
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643 Portions of the source code can be excluded or included based on conditions |
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644 known at assembly time. Conditionals can be nested arbitrarily deeply. The |
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645 directives associated with conditional assembly are described in this section. |
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646 </para> |
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647 <para>All conditionals must be fully bracketed. That is, every conditional |
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648 statement must eventually be followed by an ENDC at the same level of nesting. |
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649 </para> |
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650 <para>Conditional expressions are only evaluated on the first assembly pass. |
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651 It is not possible to game the assembly process by having a conditional |
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652 change its value between assembly passes. Thus there is not and never will |
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653 be any equivalent of IFP1 or IFP2 as provided by other assemblers.</para> |
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654 |
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655 <variablelist> |
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656 <varlistentry> |
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657 <term>IFEQ <parameter>expr</parameter></term> |
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658 <listitem> |
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659 <para>If <parameter>expr</parameter> evaluates to zero, the conditional |
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660 will be considered true. |
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661 </para> |
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662 </listitem> |
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663 </varlistentry> |
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|
664 |
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665 <varlistentry> |
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666 <term>IFNE <parameter>expr</parameter></term> |
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667 <term>IF <parameter>expr</parameter></term> |
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668 <listitem> |
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669 <para>If <parameter>expr</parameter> evaluates to a non-zero value, the conditional |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
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diff
changeset
|
670 will be considered true. |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
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parents:
109
diff
changeset
|
671 </para> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
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parents:
109
diff
changeset
|
672 </listitem> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
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parents:
109
diff
changeset
|
673 </varlistentry> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
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parents:
109
diff
changeset
|
674 |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
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parents:
109
diff
changeset
|
675 <varlistentry> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
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109
diff
changeset
|
676 <term>IFGT <parameter>expr</parameter></term> |
afe30454382f
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109
diff
changeset
|
677 <listitem> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
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parents:
109
diff
changeset
|
678 <para>If <parameter>expr</parameter> evaluates to a value greater than zero, the conditional |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
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parents:
109
diff
changeset
|
679 will be considered true. |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
680 </para> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
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parents:
109
diff
changeset
|
681 </listitem> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
682 </varlistentry> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
683 |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
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parents:
109
diff
changeset
|
684 <varlistentry> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
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parents:
109
diff
changeset
|
685 <term>IFGE <parameter>expr</parameter></term> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
686 <listitem> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
687 <para>If <parameter>expr</parameter> evaluates to a value greater than or equal to zero, the conditional |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
688 will be considered true. |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
689 </para> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
690 </listitem> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
691 </varlistentry> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
692 |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
693 <varlistentry> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
694 <term>IFLT <parameter>expr</parameter></term> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
695 <listitem> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
696 <para>If <parameter>expr</parameter> evaluates to a value less than zero, the conditional |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
697 will be considered true. |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
698 </para> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
699 </listitem> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
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parents:
109
diff
changeset
|
700 </varlistentry> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
701 |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
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parents:
109
diff
changeset
|
702 <varlistentry> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
703 <term>IFLE <parameter>expr</parameter></term> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
704 <listitem> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
705 <para>If <parameter>expr</parameter> evaluates to a value less than or equal to zero , the conditional |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
706 will be considered true. |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
707 </para> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
708 </listitem> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
709 </varlistentry> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
710 |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
711 <varlistentry> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
712 <term>IFDEF <parameter>sym</parameter></term> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
713 <listitem> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
714 <para>If <parameter>sym</parameter> is defined at this point in the assembly |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
715 process, the conditional |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
716 will be considered true. |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
717 </para> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
718 </listitem> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
719 </varlistentry> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
720 |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
721 <varlistentry> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
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109
diff
changeset
|
722 <term>IFNDEF <parameter>sym</parameter></term> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
723 <listitem> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
724 <para>If <parameter>sym</parameter> is not defined at this point in the assembly |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
725 process, the conditional |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
726 will be considered true. |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
727 </para> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
728 </listitem> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
729 </varlistentry> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
730 |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
731 <varlistentry> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
732 <term>ELSE</term> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
733 <listitem> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
734 <para> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
735 If the preceding conditional at the same level of nesting was false, the |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
736 statements following will be assembled. If the preceding conditional at |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
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parents:
109
diff
changeset
|
737 the same level was true, the statements following will not be assembled. |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
738 Note that the preceding conditional might have been another ELSE statement |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
739 although this behaviour is not guaranteed to be supported in future versions |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
740 of LWASM. |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
741 </para> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
742 </listitem> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
743 |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
744 <varlistentry> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
745 <term>ENDC</term> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
746 <listitem> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
747 <para> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
748 This directive marks the end of a conditional construct. Every conditional |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
749 construct must end with an ENDC directive. |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
750 </para> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
751 </listitem> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
752 </varlistentry> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
753 |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
754 </variablelist> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
755 </section> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
756 |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
757 <section> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
758 <title>Miscelaneous Directives</title> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
759 |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
760 <para>This section includes directives that do not fit into the other |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
761 categories.</para> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
762 |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
763 <variablelist> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
764 |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
765 <varlistentry> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
766 <term>INCLUDE <parameter>filename</parameter></term> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
767 <listitem> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
768 <para> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
769 Include the contents of <parameter>filename</parameter> at this point in |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
770 the assembly as though it were a part of the file currently being processed. |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
771 Note that whitespace cannot appear in the name of the file. |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
772 </para> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
773 </listitem> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
774 </varlistentry> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
775 |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
776 <varlistentry> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
777 <term>END <parameter>[expr]</parameter></term> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
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parents:
109
diff
changeset
|
778 <listitem> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
779 <para> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
780 This directive causes the assembler to stop assembling immediately as though |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
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parents:
109
diff
changeset
|
781 it ran out of input. For the DECB target only, <parameter>expr</parameter> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
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parents:
109
diff
changeset
|
782 can be used to set the execution address of the resulting binary. For all |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
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parents:
109
diff
changeset
|
783 other targets, specifying <parameter>expr</parameter> will cause an error. |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
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parents:
109
diff
changeset
|
784 </para> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
785 </listitem> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
786 </varlistentry> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
787 |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
788 <varlistentry> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
789 <term>ERROR <parameter>string</parameter></term> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
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parents:
109
diff
changeset
|
790 <listitem> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
791 <para> |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
lost
parents:
109
diff
changeset
|
792 Causes a custom error message to be printed at this line. This will cause |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
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parents:
109
diff
changeset
|
793 assembly to fail. This directive is most useful inside conditional constructs |
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794 to cause assembly to fail if some condition that is known bad happens. |
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795 </para> |
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796 </listitem> |
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797 </varlistentry> |
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798 |
167 | 799 <varlistentry> |
800 <term>.MODULE <parameter>string</parameter></term> | |
801 <listitem> | |
802 <para> | |
803 This directive is ignored for most output targets. If the output target | |
804 supports encoding a module name into it, <parameter>string</parameter> | |
805 will be used as the module name. | |
806 </para> | |
807 <para> | |
808 As of version 2.2, no supported output targets support this directive. | |
809 </para> | |
810 </listitem> | |
811 </varlistentry> | |
812 | |
145
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813 </variablelist> |
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814 </section> |
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815 |
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816 </section> |
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817 |
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818 <section> |
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819 <title>Macros</title> |
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820 <para> |
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821 LWASM is a macro assembler. A macro is simply a name that stands in for a |
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822 series of instructions. Once a macro is defined, it is used like any other |
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823 assembler directive. Defining a macro can be considered equivalent to adding |
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824 additional assembler directives. |
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825 </para> |
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826 <para>Macros my accept parameters. These parameters are referenced within |
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827 a macro by the a backslash ("\") followed by a digit 1 through 9 for the first |
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828 through ninth parameters. They may also be referenced by enclosing the |
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829 decimal parameter number in braces ("{num}"). These parameter references |
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830 are replaced with the verbatim text of the parameter passed to the macro. A |
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831 reference to a non-existent parameter will be replaced by an empty string. |
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832 Macro parameters are expanded everywhere on each source line. That means |
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833 the parameter to a macro could be used as a symbol or it could even appear |
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834 in a comment or could cause an entire source line to be commented out |
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835 when the macro is expanded. |
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836 </para> |
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837 <para> |
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838 Parameters passed to a macro are separated by commas and the parameter list |
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839 is terminated by any whitespace. This means that neither a comma nor whitespace |
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840 may be included in a macro parameter. |
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841 </para> |
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842 <para> |
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843 Macro expansion is done recursively. That is, within a macro, macros are |
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844 expanded. This can lead to infinite loops in macro expansion. If the assembler |
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845 hangs for a long time while assembling a file that uses macros, this may be |
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846 the reason.</para> |
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847 |
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848 <para>Each macro expansion receives its own local symbol context which is not |
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849 inherited by any macros called by it nor is it inherited from the context |
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850 the macro was instantiated in. That means it is possible to use local symbols |
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851 within macros without having them collide with symbols in other macros or |
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852 outside the macro itself. However, this also means that using a local symbol |
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853 as a parameter to a macro, while legal, will not do what it would seem to do |
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854 as it will result in looking up the local symbol in the macro's symbol context |
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855 rather than the enclosing context where it came from, likely yielding either |
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856 an undefined symbol error or bizarre assembly results. |
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857 </para> |
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858 <para> |
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859 Note that there is no way to define a macro as local to a symbol context. All |
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860 macros are part of the global macro namespace. However, macros have a separate |
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861 namespace from symbols so it is possible to have a symbol with the same name |
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862 as a macro. |
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863 </para> |
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864 |
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865 <para> |
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866 Macros are defined only during the first pass. Macro expansion also |
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867 only occurs during the first pass. On the second pass, the macro |
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868 definition is simply ignored. Macros must be defined before they are used. |
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869 </para> |
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870 |
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871 <para>The following directives are used when defining macros.</para> |
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872 |
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873 <variablelist> |
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874 <varlistentry> |
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875 <term><parameter>macroname</parameter> MACRO</term> |
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876 <listitem> |
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877 <para>This directive is used to being the definition of a macro called |
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878 <parameter>macroname</parameter>. If <parameter>macroname</parameter> already |
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879 exists, it is considered an error. Attempting to define a macro within a |
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880 macro is undefined. It may work and it may not so the behaviour should not |
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881 be relied upon. |
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882 </para> |
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883 </listitem> |
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884 </varlistentry> |
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885 |
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886 <varlistentry> |
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887 <term>ENDM</term> |
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888 <listitem> |
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889 <para> |
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890 This directive indicates the end of the macro currently being defined. It |
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891 causes the assembler to resume interpreting source lines as normal. |
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892 </para> |
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893 </listitem> |
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894 </variablelist> |
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895 |
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896 </section> |
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897 |
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898 <section> |
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899 <title>Object Files and Sections</title> |
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900 <para> |
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901 The object file target is very useful for large project because it allows |
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902 multiple files to be assembled independently and then linked into the final |
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903 binary at a later time. It allows only the small portion of the project |
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904 that was modified to be re-assembled rather than requiring the entire set |
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905 of source code to be available to the assembler in a single assembly process. |
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906 This can be particularly important if there are a large number of macros, |
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907 symbol definitions, or other metadata that uses resources at assembly time. |
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908 By far the largest benefit, however, is keeping the source files small enough |
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909 for a mere mortal to find things in them. |
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910 </para> |
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911 |
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912 <para> |
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913 With multi-file projects, there needs to be a means of resolving references to |
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914 symbols in other source files. These are known as external references. The |
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915 addresses of these symbols cannot be known until the linker joins all the |
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916 object files into a single binary. This means that the assembler must be |
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917 able to output the object code without knowing the value of the symbol. This |
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918 places some restrictions on the code generated by the assembler. For |
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919 example, the assembler cannot generate direct page addressing for instructions |
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920 that reference external symbols because the address of the symbol may not |
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921 be in the direct page. Similarly, relative branches and PC relative addressing |
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922 cannot be used in their eight bit forms. Everything that must be resolved |
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923 by the linker must be assembled to use the largest address size possible to |
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diff
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|
924 allow the linker to fill in the correct value at link time. Note that the |
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diff
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925 same problem applies to absolute address references as well, even those in |
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diff
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|
926 the same source file, because the address is not known until link time. |
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diff
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|
927 </para> |
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diff
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|
928 |
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|
929 <para> |
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|
930 It is often desired in multi-file projects to have code of various types grouped |
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|
931 together in the final binary generated by the linker as well. The same applies |
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932 to data. In order for the linker to do that, the bits that are to be grouped |
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Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
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|
933 must be tagged in some manner. This is where the concept of sections comes in. |
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Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
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|
934 Each chunk of code or data is part of a section in the object file. Then, |
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935 when the linker reads all the object files, it coalesces all sections of the |
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936 same name into a single section and then considers it as a unit. |
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diff
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|
937 </para> |
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|
938 |
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|
939 <para> |
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940 The existence of sections, however, raises a problem for symbols even |
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941 within the same source file. Thus, the assembler must treat symbols from |
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942 different sections within the same source file in the same manner as external |
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|
943 symbols. That is, it must leave them for the linker to resolve at link time, |
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944 with all the limitations that entails. |
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diff
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|
945 </para> |
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|
946 |
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|
947 <para> |
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948 In the object file target mode, LWASM requires all source lines that |
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|
949 cause bytes to be output to be inside a section. Any directives that do |
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950 not cause any bytes to be output can appear outside of a section. This includes |
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951 such things as EQU or RMB. Even ORG can appear outside a section. ORG, however, |
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952 makes no sense within a section because it is the linker that determines |
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953 the starting address of the section's code, not the assembler. |
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|
954 </para> |
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|
955 |
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|
956 <para> |
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957 All symbols defined globally in the assembly process are local to the |
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958 source file and cannot be exported. All symbols defined within a section are |
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959 considered local to the source file unless otherwise explicitly exported. |
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960 Symbols referenced from external source files must be declared external, |
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961 either explicitly or by asking the assembler to assume that all undefined |
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962 symbols are external. |
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|
963 </para> |
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|
964 |
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|
965 <para> |
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966 It is often handy to define a number of memory addresses that will be |
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967 used for data at run-time but which need not be included in the binary file. |
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968 These memory addresses are not initialized until run-time, either by the |
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969 program itself or by the program loader, depending on the operating environment. |
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970 Such sections are often known as BSS sections. LWASM supports generating |
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971 sections with a BSS attribute set which causes the section definition including |
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972 symbols exported from that section and those symbols required to resolve |
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973 references from the local file, but with no actual code in the object file. |
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974 It is illegal for any source lines within a BSS flagged section to cause any |
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975 bytes to be output. |
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|
976 </para> |
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|
977 |
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978 <para>The following directives apply to section handling.</para> |
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|
979 |
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|
980 <variablelist> |
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|
981 <varlistentry> |
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982 <term>SECTION <parameter>name[,flags]</parameter></term> |
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983 <term>SECT <parameter>name[,flags]</parameter></term> |
167 | 984 <term>.AREA <parameter>name[,flags]</parameter></term> |
145
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985 <listitem> |
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|
986 <para> |
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987 Instructs the assembler that the code following this directive is to be |
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988 considered part of the section <parameter>name</parameter>. A section name |
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989 may appear multiple times in which case it is as though all the code from |
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990 all the instances of that section appeared adjacent within the source file. |
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991 However, <parameter>flags</parameter> may only be specified on the first |
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992 instance of the section. |
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|
993 </para> |
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994 <para>There is a single flag supported in <parameter>flags</parameter>. The |
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995 flag <parameter>bss</parameter> will cause the section to be treated as a BSS |
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996 section and, thus, no code will be included in the object file nor will any |
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997 bytes be permitted to be output.</para> |
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998 <para> |
159
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Updated docs to reflect new cescapes pragma and discuss implicit assumption of the bss section flag for sections named bss and .bss
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diff
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|
999 If the section name is "bss" or ".bss" in any combination of upper and |
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1000 lower case, the section is assumed to be a BSS section. In that case, |
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Updated docs to reflect new cescapes pragma and discuss implicit assumption of the bss section flag for sections named bss and .bss
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1001 the flag <parameter>!bss</parameter> can be used to override this assumption. |
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1002 </para> |
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|
1003 <para> |
145
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1004 If assembly is already happening within a section, the section is implicitly |
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1005 ended and the new section started. This is not considered an error although |
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1006 it is recommended that all sections be explicitly closed. |
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|
1007 </para> |
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|
1008 </listitem> |
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1009 </varlistentry> |
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|
1010 |
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|
1011 <varlistentry> |
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1012 <term>ENDSECTION</term> |
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1013 <term>ENDSECT</term> |
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1014 <term>ENDS</term> |
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1015 <listitem> |
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|
1016 <para> |
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1017 This directive ends the current section. This puts assembly outside of any |
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1018 sections until the next SECTION directive. |
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1019 </listitem> |
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1020 </varlistentry> |
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1021 |
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1022 <varlistentry> |
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1023 <term><parameter>sym</parameter> EXTERN</term> |
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1024 <term><parameter>sym</parameter> EXTERNAL</term> |
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1025 <term><parameter>sym</parameter> IMPORT</term> |
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1026 <listitem> |
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1027 <para> |
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1028 This directive defines <parameter>sym</parameter> as an external symbol. |
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1029 This directive may occur at any point in the source code. EXTERN definitions |
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1030 are resolved on the first pass so an EXTERN definition anywhere in the |
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1031 source file is valid for the entire file. The use of this directive is |
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1032 optional when the assembler is instructed to assume that all undefined |
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1033 symbols are external. In fact, in that mode, if the symbol is referenced |
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1034 before the EXTERN directive, an error will occur. |
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|
1035 </para> |
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|
1036 </listitem> |
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1037 </varlistentry> |
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|
1038 |
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1039 <varlistentry> |
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1040 <term><parameter>sym</parameter> EXPORT</term> |
167 | 1041 <term><parameter>sym</parameter> .GLOBL</term> |
1042 | |
1043 <term>EXPORT <parameter>sym</parameter></term> | |
1044 <term>.GLOBL <parameter>sym</parameter></term> | |
1045 | |
145
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1046 <listitem> |
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1047 <para> |
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1048 This directive defines <parameter>sym</parameter> as an exported symbol. |
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1049 This directive may occur at any point in the source code, even before the |
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1050 definition of the exported symbol. |
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|
1051 </para> |
167 | 1052 <para> |
1053 Note that <parameter>sym</parameter> may appear as the operand or as the | |
1054 statement's symbol. If there is a symbol on the statement, that will | |
1055 take precedence over any operand that is present. | |
1056 </para> | |
145
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1057 </listitem> |
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|
1058 </varlistentry> |
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|
1059 |
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|
1060 </variablelist> |
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|
1061 |
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|
1062 </section> |
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|
1063 |
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|
1064 <section> |
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1065 <title>Assembler Modes and Pragmas</title> |
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|
1066 <para> |
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1067 There are a number of options that affect the way assembly is performed. |
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1068 Some of these options can only be specified on the command line because |
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1069 they determine something absolute about the assembly process. These include |
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|
1070 such things as the output target. Other things may be switchable during |
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1071 the assembly process. These are known as pragmas and are, by definition, |
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1072 not portable between assemblers. |
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|
1073 </para> |
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|
1074 |
afe30454382f
Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
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|
1075 <para>LWASM supports a number of pragmas that affect code generation or |
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1076 otherwise affect the behaviour of the assembler. These may be specified by |
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1077 way of a command line option or by assembler directives. The directives |
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|
1078 are as follows. |
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|
1079 </para> |
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|
1080 |
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|
1081 <variablelist> |
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|
1082 <varlistentry> |
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1083 <term>PRAGMA <parameter>pragma[,...]</parameter></term> |
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1084 <listitem> |
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|
1085 <para> |
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1086 Specifies that the assembler should bring into force all <parameter>pragma</parameter>s |
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1087 specified. Any unrecognized pragma will cause an assembly error. The new |
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1088 pragmas will take effect immediately. This directive should be used when |
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1089 the program will assemble incorrectly if the pragma is ignored or not supported. |
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1090 </para> |
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|
1091 </listitem> |
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1092 </varlistentry> |
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|
1093 |
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1094 <varlistentry> |
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1095 <term>*PRAGMA <parameter>pragma[,...]</parameter></term> |
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1096 <listitem> |
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|
1097 <para> |
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1098 This is identical to the PRAGMA directive except no error will occur with |
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1099 unrecognized or unsupported pragmas. This directive, by virtue of starting |
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1100 with a comment character, will also be ignored by assemblers that do not |
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1101 support this directive. Use this variation if the pragma is not required |
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1102 for correct functioning of the code. |
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|
1103 </para> |
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|
1104 </listitem> |
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|
1105 </varlistentry> |
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|
1106 </variablelist> |
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|
1107 |
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Made development version of LWASM be 2.1, not 3.0, because the next release will be an incremental feature release
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1108 <para>Each pragma supported has a positive version and a negative version. |
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1109 The positive version enables the pragma while the negative version disables |
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1110 it. The negatitve version is simply the positive version with "no" prefixed |
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1111 to it. For instance, "pragma" vs. "nopragma". Only the positive version is |
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1112 listed below.</para> |
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1113 |
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1114 <para>Pragmas are not case sensitive.</para> |
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1115 |
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diff
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|
1116 <variablelist> |
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1117 <varlistentry> |
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1118 <term>index0tonone</term> |
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1119 <listitem> |
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|
1120 <para> |
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1121 When in force, this pragma enables an optimization affecting indexed addressing |
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|
1122 modes. When the offset expression in an indexed mode evaluates to zero but is |
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1123 not explicity written as 0, this will replace the operand with the equivalent |
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1124 no offset mode, thus creating slightly faster code. Because of the advantages |
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1125 of this optimization, it is enabled by default. |
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|
1126 </para> |
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|
1127 </listitem> |
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|
1128 </varlistentry> |
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|
1129 |
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|
1130 <varlistentry> |
159
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Updated docs to reflect new cescapes pragma and discuss implicit assumption of the bss section flag for sections named bss and .bss
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|
1131 <term>cescapes</term> |
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Updated docs to reflect new cescapes pragma and discuss implicit assumption of the bss section flag for sections named bss and .bss
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|
1132 <listitem> |
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1133 <para> |
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|
1134 This pragma will cause strings in the FCC, FCS, and FCN pseudo operations to |
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Updated docs to reflect new cescapes pragma and discuss implicit assumption of the bss section flag for sections named bss and .bss
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diff
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|
1135 have C-style escape sequences interpreted. The one departure from the official |
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|
1136 spec is that unrecognized escape sequences will return either the character |
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Updated docs to reflect new cescapes pragma and discuss implicit assumption of the bss section flag for sections named bss and .bss
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1137 immediately following the backslash or some undefined value. Do not rely |
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1138 on the behaviour of undefined escape sequences. |
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1139 </para> |
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1140 </listitem> |
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|
1141 </varlistentry> |
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1142 |
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|
1143 <varlistentry> |
227 | 1144 <term>importundefexport</term> |
1145 <listitem> | |
1146 <para> | |
1147 This pragma is only valid for targets that support external references. When | |
1148 in force, it will cause the EXPORT directive to act as IMPORT if the symbol | |
1149 to be exported is not defined. This is provided for compatibility with the | |
1150 output of gcc6809 and should not be used in hand written code. Because of | |
1151 the confusion this pragma can cause, it is disabled by default. | |
1152 </para> | |
1153 </listitem> | |
1154 </varlistentry> | |
1155 | |
1156 <varlistentry> | |
145
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1157 <term>undefextern</term> |
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1158 <listitem> |
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|
1159 <para> |
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1160 This pragma is only valid for targets that support external references. When in |
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1161 force, if the assembler sees an undefined symbol on the second pass, it will |
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1162 automatically define it as an external symbol. This automatic definition will |
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1163 apply for the remainder of the assembly process, even if the pragma is |
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1164 subsequently turned off. Because this behaviour would be potentially surprising, |
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1165 this pragma defaults to off. |
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|
1166 </para> |
afe30454382f
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|
1167 <para> |
afe30454382f
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|
1168 The primary use for this pragma is for projects that share a large number of |
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1169 symbols between source files. In such cases, it is impractical to enumerate |
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1170 all the external references in every source file. This allows the assembler |
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1171 and linker to do the heavy lifting while not preventing a particular source |
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1172 module from defining a local symbol of the same name as an external symbol |
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1173 if it does not need the external symbol. (This pragma will not cause an |
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1174 automatic external definition if there is already a locally defined symbol.) |
afe30454382f
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|
1175 </para> |
afe30454382f
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|
1176 <para> |
afe30454382f
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|
1177 This pragma will often be specified on the command line for large projects. |
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1178 However, depending on the specific dynamics of the project, it may be sufficient |
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1179 for one or two files to use this pragma internally. |
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1180 </para> |
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1181 </listitem> |
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1182 </varlistentry> |
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1183 </variablelist> |
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1184 |
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1185 </section> |
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1186 |
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1187 </chapter> |
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1188 |
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1189 <chapter> |
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1190 <title>LWLINK</title> |
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1191 <para> |
150 | 1192 The LWTOOLS linker is called LWLINK. This chapter documents the various features |
1193 of the linker. | |
145
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1194 </para> |
150 | 1195 |
1196 <section> | |
1197 <title>Command Line Options</title> | |
1198 <para> | |
1199 The binary for LWLINK is called "lwlink". Note that the binary is in lower | |
1200 case. lwlink takes the following command line arguments. | |
1201 </para> | |
1202 <variablelist> | |
1203 <varlistentry> | |
1204 <term><option>--decb</option></term> | |
1205 <term><option>-b</option></term> | |
1206 <listitem> | |
1207 <para> | |
1208 Selects the DECB output format target. This is equivalent to <option>--format=decb</option> | |
1209 </para> | |
1210 </listitem> | |
1211 </varlistentry> | |
1212 | |
1213 <varlistentry> | |
1214 <term><option>--output=FILE</option></term> | |
1215 <term><option>-o FILE</option></term> | |
1216 <listitem> | |
1217 <para> | |
1218 This option specifies the name of the output file. If not specified, the | |
1219 default is <option>a.out</option>. | |
1220 </para> | |
1221 </listitem> | |
1222 </varlistentry> | |
1223 | |
1224 <varlistentry> | |
1225 <term><option>--format=TYPE</option></term> | |
1226 <term><option>-f TYPE</option></term> | |
1227 <listitem> | |
1228 <para> | |
1229 This option specifies the output format. Valid values are <option>decb</option> | |
1230 and <option>raw</option> | |
1231 </para> | |
1232 </listitem> | |
1233 </varlistentry> | |
1234 | |
1235 <varlistentry> | |
1236 <term><option>--raw</option></term> | |
1237 <term><option>-r</option></term> | |
1238 <listitem> | |
1239 <para> | |
1240 This option specifies the raw output format. | |
1241 It is equivalent to <option>--format=raw</option>. | |
1242 and <option>raw</option> | |
1243 </para> | |
1244 </listitem> | |
1245 </varlistentry> | |
1246 | |
1247 <varlistentry> | |
1248 <term><option>--script=FILE</option></term> | |
1249 <term><option>-s</option></term> | |
1250 <listitem> | |
1251 <para> | |
1252 This option allows specifying a linking script to override the linker's | |
1253 built in defaults. | |
1254 </para> | |
1255 </listitem> | |
1256 </varlistentry> | |
1257 | |
1258 <varlistentry> | |
186 | 1259 <term><option>--section-base=SECT=BASE</option></term> |
1260 <listitem> | |
1261 <para> | |
1262 Cause section SECT to load at base address BASE. This will be prepended | |
1263 to the built-in link script. It is ignored if a link script is provided. | |
1264 </para> | |
1265 </listitem> | |
1266 </varlistentry> | |
1267 | |
1268 <varlistentry> | |
1269 <term><option>--map=FILE</option></term> | |
1270 <term><option>-m FILE</option></term> | |
1271 <listitem> | |
1272 <para> | |
1273 This will output a description of the link result to FILE. | |
1274 </para> | |
1275 </listitem> | |
1276 </varlistentry> | |
1277 | |
1278 <varlistentry> | |
1279 <term><option>--library=LIBSPEC</option></term> | |
1280 <term><option>-l LIBSPEC</option></term> | |
1281 <listitem> | |
1282 <para> | |
1283 Load a library using the library search path. LIBSPEC will have "lib" prepended | |
1284 and ".a" appended. | |
1285 </para> | |
1286 </listitem> | |
1287 </varlistentry> | |
1288 | |
1289 <varlistentry> | |
1290 <term><option>--library-path=DIR</option></term> | |
1291 <term><option>-L DIR</option></term> | |
1292 <listitem> | |
1293 <para> | |
1294 Add DIR to the library search path. | |
1295 </para> | |
1296 </listitem> | |
1297 </varlistentry> | |
1298 | |
1299 <varlistentry> | |
150 | 1300 <term><option>--debug</option></term> |
1301 <term><option>-d</option></term> | |
1302 <listitem> | |
1303 <para> | |
1304 This option increases the debugging level. It is only useful for LWTOOLS | |
1305 developers. | |
1306 </para> | |
1307 </listitem> | |
1308 </varlistentry> | |
1309 | |
1310 <varlistentry> | |
1311 <term><option>--help</option></term> | |
1312 <term><option>-?</option></term> | |
1313 <listitem> | |
1314 <para> | |
1315 This provides a listing of command line options and a brief description | |
1316 of each. | |
1317 </para> | |
1318 </listitem> | |
1319 </varlistentry> | |
1320 | |
1321 <varlistentry> | |
1322 <term><option>--usage</option></term> | |
1323 <listitem> | |
1324 <para> | |
1325 This will display a usage summary. | |
1326 of each. | |
1327 </para> | |
1328 </listitem> | |
1329 </varlistentry> | |
1330 | |
1331 | |
1332 <varlistentry> | |
1333 <term><option>--version</option></term> | |
1334 <term><option>-V</option></term> | |
1335 <listitem> | |
1336 <para> | |
1337 This will display the version of LWLINK. | |
1338 </para> | |
1339 </listitem> | |
1340 </varlistentry> | |
1341 | |
1342 </section> | |
1343 | |
1344 <section> | |
1345 <title>Linker Operation</title> | |
1346 | |
1347 <para> | |
175 | 1348 |
1349 LWLINK takes one or more files in supported input formats and links them | |
1350 into a single binary. Currently supported formats are the LWTOOLS object | |
1351 file format and the archive format used by LWAR. While the precise method is | |
1352 slightly different, linking can be conceptualized as the following steps. | |
1353 | |
150 | 1354 </para> |
1355 | |
1356 <orderedlist> | |
1357 <listitem> | |
1358 <para> | |
1359 First, the linker loads a linking script. If no script is specified, it | |
1360 loads a built-in default script based on the output format selected. This | |
1361 script tells the linker how to lay out the various sections in the final | |
1362 binary. | |
1363 </para> | |
1364 </listitem> | |
1365 | |
1366 <listitem> | |
1367 <para> | |
1368 Next, the linker reads all the input files into memory. At this time, it | |
1369 flags any format errors in those files. It constructs a table of symbols | |
1370 for each object at this time. | |
1371 </para> | |
1372 </listitem> | |
1373 | |
1374 <listitem> | |
1375 <para> | |
1376 The linker then proceeds with organizing the sections loaded from each file | |
1377 according to the linking script. As it does so, it is able to assign addresses | |
1378 to each symbol defined in each object file. At this time, the linker may | |
1379 also collapse different instances of the same section name into a single | |
1380 section by appending the data from each subsequent instance of the section | |
1381 to the first instance of the section. | |
1382 </para> | |
1383 </listitem> | |
1384 | |
1385 <listitem> | |
1386 <para> | |
1387 Next, the linker looks through every object file for every incomplete reference. | |
1388 It then attempts to fully resolve that reference. If it cannot do so, it | |
1389 throws an error. Once a reference is resolved, the value is placed into | |
1390 the binary code at the specified section. It should be noted that an | |
1391 incomplete reference can reference either a symbol internal to the object | |
1392 file or an external symbol which is in the export list of another object | |
1393 file. | |
1394 </para> | |
1395 </listitem> | |
1396 | |
1397 <listitem> | |
1398 <para> | |
1399 If all of the above steps are successful, the linker opens the output file | |
1400 and actually constructs the binary. | |
1401 </para> | |
1402 </listitem> | |
1403 </orderedlist> | |
1404 | |
1405 </section> | |
1406 | |
1407 <section | |
1408 <title>Linking Scripts</title> | |
1409 <para> | |
1410 A linker script is used to instruct the linker about how to assemble the | |
1411 various sections into a completed binary. It consists of a series of | |
1412 directives which are considered in the order they are encountered. | |
1413 </para> | |
1414 <para> | |
1415 The sections will appear in the resulting binary in the order they are | |
1416 specified in the script file. If a referenced section is not found, the linker will behave as though the | |
1417 section did exist but had a zero size, no relocations, and no exports. | |
1418 A section should only be referenced once. Any subsequent references will have | |
1419 an undefined effect. | |
1420 </para> | |
1421 | |
1422 <para> | |
1423 All numbers are in linking scripts are specified in hexadecimal. All directives | |
1424 are case sensitive although the hexadecimal numbers are not. | |
1425 </para> | |
1426 | |
1427 <para>A section name can be specified as a "*", then any section not | |
1428 already matched by the script will be matched. The "*" can be followed | |
1429 by a comma and a flag to narrow the section down slightly, also. | |
1430 If the flag is "!bss", then any section that is not flagged as a bss section | |
1431 will be matched. If the flag is "bss", then any section that is flagged as | |
1432 bss will be matched. | |
1433 </para> | |
1434 | |
1435 <para>The following directives are understood in a linker script.</para> | |
1436 <variablelist> | |
1437 <varlistentry> | |
1438 <term>section <parameter>name</parameter> load <parameter>addr</parameter></term> | |
1439 <listitem><para> | |
1440 | |
1441 This causes the section <parameter>name</parameter> to load at | |
1442 <parameter>addr</parameter>. For the raw target, only one "load at" entry is | |
1443 allowed for non-bss sections and it must be the first one. For raw targets, | |
1444 it affects the addresses the linker assigns to symbols but has no other | |
1445 affect on the output. bss sections may all have separate load addresses but | |
1446 since they will not appear in the binary anyway, this is okay. | |
1447 </para><para> | |
1448 For the decb target, each "load" entry will cause a new "block" to be | |
1449 output to the binary which will contain the load address. It is legal for | |
1450 sections to overlap in this manner - the linker assumes the loader will sort | |
1451 everything out. | |
1452 </para></listitem> | |
1453 </varlistentry> | |
1454 | |
1455 <varlistentry> | |
1456 <term>section <parameter>name</parameter></term> | |
1457 <listitem><para> | |
1458 | |
1459 This will cause the section <parameter>name</parameter> to load after the previously listed | |
1460 section. | |
1461 </para></listitem></varlistentry> | |
1462 <varlistentry> | |
1463 <term>exec <parameter>addr or sym</parameter></term> | |
1464 <listitem> | |
1465 <para> | |
1466 This will cause the execution address (entry point) to be the address | |
1467 specified (in hex) or the specified symbol name. The symbol name must | |
1468 match a symbol that is exported by one of the object files being linked. | |
1469 This has no effect for targets that do not encode the entry point into the | |
1470 resulting file. If not specified, the entry point is assumed to be address 0 | |
1471 which is probably not what you want. The default link scripts for targets | |
1472 that support this directive automatically starts at the beginning of the | |
1473 first section (usually "init" or "code") that is emitted in the binary. | |
1474 </para> | |
1475 </listitem> | |
1476 </varlistentry> | |
1477 | |
1478 <varlistentry> | |
1479 <term>pad <parameter>size</parameter></term> | |
1480 <listitem><para> | |
1481 This will cause the output file to be padded with NUL bytes to be exactly | |
1482 <parameter>size</parameter> bytes in length. This only makes sense for a raw target. | |
1483 </para> | |
1484 </listitem> | |
1485 </varlistentry> | |
1486 </variablelist> | |
1487 | |
1488 | |
1489 | |
1490 </section> | |
1491 | |
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1492 </chapter> |
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1493 |
175 | 1494 <chapter> |
1495 <title>Libraries and LWAR</title> | |
1496 | |
1497 <para> | |
1498 LWTOOLS also includes a tool for managing libraries. These are analogous to | |
1499 the static libraries created with the "ar" tool on POSIX systems. Each library | |
1500 file contains one or more object files. The linker will treat the object | |
1501 files within a library as though they had been specified individually on | |
1502 the command line except when resolving external references. External references | |
1503 are looked up first within the object files within the library and then, if | |
1504 not found, the usual lookup based on the order the files are specified on | |
1505 the command line occurs. | |
1506 </para> | |
1507 | |
1508 <para> | |
1509 The tool for creating these libary files is called LWAR. | |
1510 </para> | |
1511 | |
1512 <section> | |
1513 <title>Command Line Options</title> | |
1514 <para> | |
1515 The binary for LWAR is called "lwar". Note that the binary is in lower | |
1516 case. The options lwar understands are listed below. For archive manipulation | |
1517 options, the first non-option argument is the name of the archive. All other | |
1518 non-option arguments are the names of files to operate on. | |
1519 </para> | |
1520 | |
1521 <variablelist> | |
1522 <varlistentry> | |
1523 <term><option>--add</option></term> | |
1524 <term><option>-a</option></term> | |
1525 <listitem> | |
1526 <para> | |
1527 This option specifies that an archive is going to have files added to it. | |
1528 If the archive does not already exist, it is created. New files are added | |
1529 to the end of the archive. | |
1530 </para> | |
1531 </listitem> | |
1532 </varlistentry> | |
1533 | |
1534 <varlistentry> | |
1535 <term><option>--create</option></term> | |
1536 <term><option>-c</option></term> | |
1537 <listitem> | |
1538 <para> | |
1539 This option specifies that an archive is going to be created and have files | |
1540 added to it. If the archive already exists, it is truncated. | |
1541 </para> | |
1542 </listitem> | |
1543 </varlistentry> | |
1544 | |
1545 <varlistentry> | |
1546 <term><option>--merge</option></term> | |
1547 <term><option>-m</option></term> | |
1548 <listitem> | |
1549 <para> | |
1550 If specified, any files specified to be added to an archive will be checked | |
1551 to see if they are archives themselves. If so, their constituent members are | |
1552 added to the archive. This is useful for avoiding archives containing archives. | |
1553 </para> | |
1554 </listitem> | |
1555 </varlistentry> | |
1556 | |
1557 <varlistentry> | |
1558 <term><option>--list</option></term> | |
1559 <term><option>-l</option></term> | |
1560 <listitem> | |
1561 <para> | |
1562 This will display a list of the files contained in the archive. | |
1563 </para> | |
1564 </listitem> | |
1565 </varlistentry> | |
1566 | |
1567 <varlistentry> | |
1568 <term><option>--debug</option></term> | |
1569 <term><option>-d</option></term> | |
1570 <listitem> | |
1571 <para> | |
1572 This option increases the debugging level. It is only useful for LWTOOLS | |
1573 developers. | |
1574 </para> | |
1575 </listitem> | |
1576 </varlistentry> | |
1577 | |
1578 <varlistentry> | |
1579 <term><option>--help</option></term> | |
1580 <term><option>-?</option></term> | |
1581 <listitem> | |
1582 <para> | |
1583 This provides a listing of command line options and a brief description | |
1584 of each. | |
1585 </para> | |
1586 </listitem> | |
1587 </varlistentry> | |
1588 | |
1589 <varlistentry> | |
1590 <term><option>--usage</option></term> | |
1591 <listitem> | |
1592 <para> | |
1593 This will display a usage summary. | |
1594 of each. | |
1595 </para> | |
1596 </listitem> | |
1597 </varlistentry> | |
1598 | |
1599 | |
1600 <varlistentry> | |
1601 <term><option>--version</option></term> | |
1602 <term><option>-V</option></term> | |
1603 <listitem> | |
1604 <para> | |
1605 This will display the version of LWLINK. | |
1606 of each. | |
1607 </para> | |
1608 </listitem> | |
1609 </varlistentry> | |
1610 | |
1611 </section> | |
1612 | |
1613 </chapter> | |
1614 | |
109 | 1615 <chapter id="objchap"> |
1616 <title>Object Files</title> | |
145
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1617 <para> |
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1618 LWTOOLS uses a proprietary object file format. It is proprietary in the sense |
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1619 that it is specific to LWTOOLS, not that it is a hidden format. It would be |
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1620 hard to keep it hidden in an open source tool chain anyway. This chapter |
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1621 documents the object file format. |
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1622 </para> |
150 | 1623 |
1624 <para> | |
1625 An object file consists of a series of sections each of which contains a | |
1626 list of exported symbols, a list of incomplete references, and a list of | |
1627 "local" symbols which may be used in calculating incomplete references. Each | |
1628 section will obviously also contain the object code. | |
1629 </para> | |
1630 | |
1631 <para> | |
1632 Exported symbols must be completely resolved to an address within the | |
1633 section it is exported from. That is, an exported symbol must be a constant | |
1634 rather than defined in terms of other symbols.</para> | |
1635 | |
1636 <para> | |
1637 Each object file starts with a magic number and version number. The magic | |
1638 number is the string "LWOBJ16" for this 16 bit object file format. The only | |
1639 defined version number is currently 0. Thus, the first 8 bytes of the object | |
1640 file are <code>4C574F424A313600</code> | |
1641 </para> | |
1642 | |
1643 <para> | |
1644 Each section has the following items in order: | |
1645 </para> | |
1646 | |
1647 <itemizedlist> | |
1648 <listitem><para>section name</para></listitem> | |
1649 <listitem><para>flags</para></listitem> | |
1650 <listitem><para>list of local symbols (and addresses within the section)</para></listitem> | |
1651 <listitem><para>list of exported symbols (and addresses within the section)</para></listitem> | |
1652 <listitem><para>list of incomplete references along with the expressions to calculate them</para></listitem> | |
1653 <listitem><para>the actual object code (for non-BSS sections)</para></listitem> | |
1654 </itemizedlist> | |
1655 | |
1656 <para> | |
1657 The section starts with the name of the section with a NUL termination | |
1658 followed by a series of flag bytes terminated by NUL. There are only two | |
1659 flag bytes defined. A NUL (0) indicates no more flags and a value of 1 | |
1660 indicates the section is a BSS section. For a BSS section, no actual | |
1661 code is included in the object file. | |
1662 </para> | |
1663 | |
1664 <para> | |
1665 Either a NULL section name or end of file indicate the presence of no more | |
1666 sections. | |
1667 </para> | |
1668 | |
1669 <para> | |
1670 Each entry in the exported and local symbols table consists of the symbol | |
1671 (NUL terminated) followed by two bytes which contain the value in big endian | |
1672 order. The end of a symbol table is indicated by a NULL symbol name. | |
1673 </para> | |
1674 | |
1675 <para> | |
1676 Each entry in the incomplete references table consists of an expression | |
1677 followed by a 16 bit offset where the reference goes. Expressions are | |
1678 defined as a series of terms up to an "end of expression" term. Each term | |
1679 consists of a single byte which identifies the type of term (see below) | |
1680 followed by any data required by the term. Then end of the list is flagged | |
1681 by a NULL expression (only an end of expression term). | |
1682 </para> | |
1683 | |
1684 <table frame="all"><title>Object File Term Types</title> | |
1685 <tgroup cols="2"> | |
1686 <thead> | |
1687 <row> | |
1688 <entry>TERMTYPE</entry> | |
1689 <entry>Meaning</entry> | |
1690 </row> | |
1691 </thead> | |
1692 <tbody> | |
1693 <row> | |
1694 <entry>00</entry> | |
1695 <entry>end of expression</entry> | |
1696 </row> | |
1697 | |
1698 <row> | |
1699 <entry>01</entry> | |
1700 <entry>integer (16 bit in big endian order follows)</entry> | |
1701 </row> | |
1702 <row> | |
1703 <entry>02</entry> | |
1704 <entry> external symbol reference (NUL terminated symbol name follows)</entry> | |
1705 </row> | |
1706 | |
1707 <row> | |
1708 <entry>03</entry> | |
1709 <entry>local symbol reference (NUL terminated symbol name follows)</entry> | |
1710 </row> | |
1711 | |
1712 <row> | |
1713 <entry>04</entry> | |
1714 <entry>operator (1 byte operator number)</entry> | |
1715 </row> | |
1716 <row> | |
1717 <entry>05</entry> | |
1718 <entry>section base address reference</entry> | |
1719 </row> | |
1720 </tbody> | |
1721 </tgroup> | |
1722 </table> | |
1723 | |
1724 <para> | |
1725 External references are resolved using other object files while local | |
1726 references are resolved using the local symbol table(s) from this file. This | |
1727 allows local symbols that are not exported to have the same names as | |
1728 exported symbols or external references. | |
1729 </para> | |
1730 | |
1731 <table frame="all"><title>Object File Operator Numbers</title> | |
1732 <tgroup cols="2"> | |
1733 <thead> | |
1734 <row> | |
1735 <entry>Number</entry> | |
1736 <entry>Operator</entry> | |
1737 </row> | |
1738 </thead> | |
1739 <tbody> | |
1740 <row> | |
1741 <entry>01</entry> | |
1742 <entry>addition (+)</entry> | |
1743 </row> | |
1744 <row> | |
1745 <entry>02</entry> | |
1746 <entry>subtraction (-)</entry> | |
1747 </row> | |
1748 <row> | |
1749 <entry>03</entry> | |
1750 <entry>multiplication (*)</entry> | |
1751 </row> | |
1752 <row> | |
1753 <entry>04</entry> | |
1754 <entry>division (/)</entry> | |
1755 </row> | |
1756 <row> | |
1757 <entry>05</entry> | |
1758 <entry>modulus (%)</entry> | |
1759 </row> | |
1760 <row> | |
1761 <entry>06</entry> | |
1762 <entry>integer division (\) (same as division)</entry> | |
1763 </row> | |
1764 | |
1765 <row> | |
1766 <entry>07</entry> | |
1767 <entry>bitwise and</entry> | |
1768 </row> | |
1769 | |
1770 <row> | |
1771 <entry>08</entry> | |
1772 <entry>bitwise or</entry> | |
1773 </row> | |
1774 | |
1775 <row> | |
1776 <entry>09</entry> | |
1777 <entry>bitwise xor</entry> | |
1778 </row> | |
1779 | |
1780 <row> | |
1781 <entry>0A</entry> | |
1782 <entry>boolean and</entry> | |
1783 </row> | |
1784 | |
1785 <row> | |
1786 <entry>0B</entry> | |
1787 <entry>boolean or</entry> | |
1788 </row> | |
1789 | |
1790 <row> | |
1791 <entry>0C</entry> | |
1792 <entry>unary negation, 2's complement (-)</entry> | |
1793 </row> | |
1794 | |
1795 <row> | |
1796 <entry>0D</entry> | |
1797 <entry>unary 1's complement (^)</entry> | |
1798 </row> | |
1799 </tbody> | |
1800 </tgroup> | |
1801 </table> | |
1802 | |
1803 <para> | |
1804 An expression is represented in a postfix manner with both operands for | |
1805 binary operators preceding the operator and the single operand for unary | |
1806 operators preceding the operator. | |
1807 </para> | |
1808 | |
109 | 1809 </chapter> |
1810 </book> | |
1811 |