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<!doctype html public "-//W3C//DTD HTML 3.2//EN"><html><head><title>Pseduo-instructions</title><meta http-equiv="content-type" content="text/html; charset=ISO-8859-1" /><meta http-equiv="content-language" content="en" /><meta name="resource-type" content="document"><meta name="copyright" content="This document copyright 2001 by Richard Murray. Use for non-profit and education purposes explicitly granted."><meta name="author" content="Richard Murray"><meta name="rating" content="general"></head><!-- /assembler/pseudo.html --><!-- --><!-- (C) Copyright 2001 Richard Murray --><!-- Designed by Richard Murray --><!-- rmurray@heyrick.co.uk --><!-- --><body bgcolor="#f0f0f0" text="#000000" link="#0022dd" vlink="#002288"><table border = "0" width="100%"> <tr> <td align=center width=100> <img src="arm3.gif" width=79 height=78 align = middle> </td> <td> <h1 align="center"><font color="#800080">Pseudo <br>instructions</font></h1> </td> <td align=center width=100> <img src="arm3.gif" width=79 height=78 align = middle> </td></table><p> <p>The BASIC assembler provides you with a selection of pseudo-instructions. These areinstructions which are not actually understood by the processor, but are converted into somethingthat may be understood. They exist to make your programming simpler.<p> <p><a name="adr"></a><h2>ADR : load ADRess</h2><pre> ADR<suffix> <register>, <label></pre>This loads the address referred into the given register:<pre> 00008FE4 OPT l% 00008FE4 E28F0004 ADR R0, text 00008FE8 EF000002 SWI "OS_Write0" 00008FEC E1A0F00E MOV PC, R14 00008FF0 .text 00008FF0 EQUS "Hello!" + CHR$13 + CHR$10 + CHR$0 00008FFC ALIGN</pre><p>The following code has the exact same effect:<pre> 00008FE4 OPT l% 00008FE4 E28F0004 ADD R0, R15, #4 00008FE8 EF000002 SWI "OS_Write0" 00008FEC E1A0F00E MOV PC, R14 00008FF0 .text 00008FF0 EQUS "Hello!" + CHR$13 + CHR$10 + CHR$0 00008FFC ALIGN</pre>Indeed, a disassembly of either of the above would show:<pre> *MemoryI 8FE4 +18 00008FE4 : E28F0004 : ..忊 : ADR R0,&00008FF0 00008FE8 : EF000002 : ...⌨️ 快捷键说明
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