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index.html
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index.html
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@ -19,7 +19,6 @@
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<button type="button" class="btn btn-default navbar-btn" ng-click="executeStep()" ng-disabled="isRunning"><span class="glyphicon glyphicon-forward"></span> Step</button>
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</div>
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<button type="button" class="btn btn-default navbar-btn" ng-click="reset()">Reset</button>
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<button data-toggle="modal" href="#helpModal" class="btn btn-info navbar-btn">Help</button>
|
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</div>
|
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<div class="navbar-header navbar-right">
|
||||
<a class="navbar-brand" style="color:#FFFFFF">Simple 8-bit Assembler Simulator</a>
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@ -32,7 +31,7 @@
|
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<div class="col-lg-7 col-md-6">
|
||||
<div class="panel panel-default">
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||||
<div class="panel-heading">
|
||||
<h4 class="panel-title">Code (<a href="./instruction-set.html" target="_blank">Instruction Set</a>)</h4>
|
||||
<h4 class="panel-title">Code <small>(<a href="./instruction-set.html" target="_blank">Instruction Set</a>)</small></h4>
|
||||
</div>
|
||||
<div class="panel-body">
|
||||
<form role="form">
|
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@ -123,255 +122,7 @@
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</div>
|
||||
<hr style="margin-top:10px;margin-bottom:10px;"/>
|
||||
<p><small>by Marco Schweighauser (2013) | MIT License</small></p>
|
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<div class="modal fade" id="helpModal" tabindex="-1" role="dialog" aria-hidden="true">
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<div class="modal-dialog">
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<div class="modal-content">
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<div class="modal-header">
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<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
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<h4 class="modal-title">Assembler Help</h4>
|
||||
</div>
|
||||
<div class="modal-body">
|
||||
<h4>Introduction</h4>
|
||||
<p>This simulator provides a simplified assembler syntax (based on <a href="http://www.nasm.us" target="_blank">NASM</a>) and is simulating a x86 like cpu. In depth documentation and introduction to assembler can be found on the following websites:</p>
|
||||
<ul>
|
||||
<li><a href="http://en.wikipedia.org/wiki/Assembly_language" target="_blank">Assembly - Wikipedia</a></li>
|
||||
<li><a href="http://cs.smith.edu/~thiebaut/ArtOfAssembly/artofasm.html" target="_blank">The Art of Assembly Language Programming</a></li>
|
||||
<li><a href="http://www.nasm.us/xdoc/2.10.09/html/nasmdoc3.html" target="_blank">NASM Language Documentation</a></li>
|
||||
</ul>
|
||||
<p>The simulator consists of a 8-bit cpu and 256 bytes of memory. All instructions (code) and variables (data) needs to fit inside the memory. For simplicity every instruction (and operand) is 1 byte. Therefore a MOV instruction will use 3 bytes of memory. The simulator provides a console output which is memory mapped from 0xE8 to 0xFF. Memory mapped means that every value written to this memory block is visible on the console.</p>
|
||||
<h4>Syntax</h4>
|
||||
<p>The syntax is similar as most assemblers are using. Every instruction must be on their own line. Labels are optional and must either start with a letter or a dot (.) and end with a colon.</p>
|
||||
<pre>label: instruction operands ; Comment</pre>
|
||||
<p>Valid number formats for constants are:</p>
|
||||
<pre>
|
||||
Decimal: 200
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||||
Decimal: 200d
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||||
Hex: 0xA4
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||||
Octal: 0o48
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||||
Binary: 101b
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||||
</pre>
|
||||
<p>It is possible to define a number using a character or multiple numbers (see instruction <i>DB</i>) by using a string.</p>
|
||||
<pre>
|
||||
Character: 'A'
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String: "Hello World!"
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||||
</pre>
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||||
<p>Operands can either be one of the four general purpose registers, a memory address or a constant. Instead of defining an address as a constant or by using a register you can use labels. The assembler will then replace the label with the corresponding constant.</p>
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||||
<pre>
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Register: A, B, C, D
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Address using a register: [A]
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Address using a constant: [100]
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Address using a label: label
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Constant: Any number between 0-255 (8bit unsigned)
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||||
</pre>
|
||||
<h4>MOV - Copy a value</h4>
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<p>Copies a value from <i>src</i> to <i>dest</i>. The MOV instruction is the only one able to directly modify the memory.</p>
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<pre>
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MOV reg, reg
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MOV reg, address
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MOV reg, constant
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MOV address, reg
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MOV address, constant
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</pre>
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<h4>DB - Variable</h4>
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<p>Defines a variable. A variable can either be a single number, character or a string.</p>
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<pre>
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DB constant
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</pre>
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<h4>Math operations</h4>
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<b>Addition and Subtraction</b>
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<p>Adds two numbers together or subtract one number form another. This operations will modify the carry and zero flag.</p>
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<pre>
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ADD reg, reg
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ADD reg, address
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ADD reg, constant
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SUB reg, reg
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SUB reg, address
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SUB reg, constant
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</pre>
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||||
<b>Increment and Decrement</b>
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<p>Increments or decrements a register by one. This operations will modify the carry and zero flag.</p>
|
||||
<pre>
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INC reg
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DEC reg
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</pre>
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<b>Multiplication and division</b>
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<p>Multiplies or divides the <i>A</i> register with the given value. This operations will modify the carry and zero flag.</p>
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<pre>
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MUL reg
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MUL address
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MUL constant
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DIV reg
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DIV address
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DIV constant
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</pre>
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<b>Logical instructions</b>
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<p>The following logical instructions are supported: AND, OR, XOR, NOT. This operations will modify the carry and zero flag.</p>
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<pre>
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AND reg, reg
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AND reg, address
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AND reg, constant
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OR reg, reg
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OR reg, address
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OR reg, constant
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XOR reg, reg
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XOR reg, address
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XOR reg, constant
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NOT reg
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</pre>
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<b>Shift instructions</b>
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<p>The following shift instructions are supported: SHL/SAL and SHR/SAR. As this simulator only supports unsigned numbers SHR and SAR yield the same result. This operations will modify the carry and zero flag.</p>
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<pre>
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SHL reg, reg
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SHL reg, address
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SHL reg, constant
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SHR reg, reg
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SHR reg, address
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SHR reg, constant
|
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</pre>
|
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<h4>CMP - Compare</h4>
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<p>Compares two values and sets the zero flag to true if they are equal. Use this instruction before a conditional jump.</p>
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<pre>
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CMP reg, reg
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CMP reg, address
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CMP reg, constant
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</pre>
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<h4>Jumps</h4>
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<b>JMP - Unconditional jump</b>
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<p>Let the instruction pointer do a unconditional jump to the defined address.</p>
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||||
<pre>
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||||
JMP address
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||||
</pre>
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||||
<b>Conditional jumps</b>
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<p>Let the instruction pointer do a conditional jump to the defined address. See the table below for the available conditions.</p>
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||||
<table class="table table-condensed table-striped">
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||||
<thead>
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||||
<tr>
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||||
<th>Instruction</th>
|
||||
<th>Description</th>
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||||
<th>Condition</th>
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<th>Alternatives</th>
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</tr>
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||||
</thead>
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<tbody>
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<tr>
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<td>JC</td>
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<td>Jump if carry</td>
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<td>Carry = TRUE</td>
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<td>JB, JNAE</td>
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</tr>
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<tr>
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||||
<td>JNC</td>
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<td>Jump if no carry</td>
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<td>Carry = FALSE</td>
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<td>JNB, JAE</td>
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</tr>
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<tr>
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<td>JZ</td>
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<td>Jump if zero</td>
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<td>Zero = TRUE</td>
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<td>JB, JE</td>
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</tr>
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<tr>
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<td>JNZ</td>
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<td>Jump if no zero</td>
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<td>Zero = FALSE</td>
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<td>JNE</td>
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</tr>
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<tr>
|
||||
<td>JA</td>
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<td>></td>
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<td>C = FALSE && Z = FALSE</td>
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<td>JNBE</td>
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</tr>
|
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<tr>
|
||||
<td>JNBE</td>
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||||
<td>not <=</td>
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||||
<td>C = FALSE && Z = FALSE</td>
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<td>JA</td>
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||||
</tr>
|
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<tr>
|
||||
<td>JAE</td>
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||||
<td>>=</td>
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||||
<td>Carry = FALSE</td>
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||||
<td>JNC, JNB</td>
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||||
</tr>
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||||
<tr>
|
||||
<td>JNB</td>
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<td>not <</td>
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<td>Carry = FALSE</td>
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<td>JNC, JAE</td>
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</tr>
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<tr>
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||||
<td>JB</td>
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<td><</td>
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<td>Carry = TRUE</td>
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<td>JC, JNAE</td>
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</tr>
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||||
<tr>
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||||
<td>JNAE</td>
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<td>not >=</td>
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<td>Carry = TRUE</td>
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<td>JC, JB</td>
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</tr>
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<tr>
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<td>JBE</td>
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<td><=</td>
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<td>C = TRUE or Z = TRUE</td>
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<td>JNA</td>
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</tr>
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||||
<tr>
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||||
<td>JNA</td>
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<td>not ></td>
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<td>C = TRUE or Z = TRUE</td>
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<td>JBE</td>
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</tr>
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<tr>
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||||
<td>JE</td>
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<td>=</td>
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<td>Z = TRUE</td>
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<td>JZ</td>
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</tr>
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||||
<tr>
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||||
<td>JNE</td>
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<td>!=</td>
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<td>Z = FALSE</td>
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||||
<td>JNZ</td>
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||||
</tr>
|
||||
</tbody>
|
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</table>
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||||
<b>CALL - Function call</b>
|
||||
<p>Call can be used to jump into a subroutine (function). Pushes the instruction address of the next instruction to the stack and jumps to the specified address.</p>
|
||||
<pre>
|
||||
CALL address
|
||||
</pre>
|
||||
<b>RET - Exit a subroutine</b>
|
||||
<p>Exits a subroutines by popping the return address previously pushed by the CALL instruction. Make sure the SP is balanced before calling RET otherwise the instruction pointer will have an ambiguous value.</p>
|
||||
<pre>
|
||||
RET
|
||||
</pre>
|
||||
<h4>Stack instructions</h4>
|
||||
<b>PUSH - Push to stack</b>
|
||||
<p>Pushes a value to the stack. The stack grows down and the current position is available in the stack pointer register (SP). This instruction will decrease the SP.</p>
|
||||
<pre>
|
||||
PUSH reg
|
||||
PUSH address
|
||||
PUSH constant
|
||||
</pre>
|
||||
<b>POP - Pop from stack</b>
|
||||
<p>Pops a value from the stack to a register. This instruction will increase the SP.</p>
|
||||
<pre>
|
||||
POP reg
|
||||
</pre>
|
||||
</div>
|
||||
<div class="modal-footer">
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<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
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<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
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<script src="https://netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
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<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.0-rc.3/angular.js"></script>
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<script src="assets/asmsimulator.js"></script>
|
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</body>
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@ -2,31 +2,35 @@
|
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<html>
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<head>
|
||||
<meta charset="UTF-8">
|
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<title>Simple 8-bit Assembler Instruction Set</title>
|
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<title>Simple 8-bit Assembler - Instruction Set Help</title>
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<link rel="stylesheet" href="https://netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css">
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<body>
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<div class="modal-dialog">
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<div class="modal-content">
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<div class="modal-header">
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<h4 class="modal-title">Assembler Help</h4>
|
||||
</div>
|
||||
<div class="modal-body">
|
||||
<h4>Introduction</h4>
|
||||
<p>This simulator provides a simplified assembler syntax (based on <a href="http://www.nasm.us" target="_blank">NASM</a>) and is simulating a x86 like cpu. In depth documentation and introduction to assembler can be found on the following websites:</p>
|
||||
<ul>
|
||||
<li><a href="http://en.wikipedia.org/wiki/Assembly_language" target="_blank">Assembly - Wikipedia</a></li>
|
||||
<li><a href="http://cs.smith.edu/~thiebaut/ArtOfAssembly/artofasm.html" target="_blank">The Art of Assembly Language Programming</a></li>
|
||||
<li><a href="http://www.nasm.us/xdoc/2.10.09/html/nasmdoc3.html" target="_blank">NASM Language Documentation</a></li>
|
||||
</ul>
|
||||
<p>The simulator consists of a 8-bit cpu and 256 bytes of memory. All instructions (code) and variables (data) needs to fit inside the memory. For simplicity every instruction (and operand) is 1 byte. Therefore a MOV instruction will use 3 bytes of memory. The simulator provides a console output which is memory mapped from 0xE8 to 0xFF. Memory mapped means that every value written to this memory block is visible on the console.</p>
|
||||
<h4>Syntax</h4>
|
||||
<p>The syntax is similar as most assemblers are using. Every instruction must be on their own line. Labels are optional and must either start with a letter or a dot (.) and end with a colon.</p>
|
||||
<pre>label: instruction operands ; Comment</pre>
|
||||
<p>Valid number formats for constants are:</p>
|
||||
<a href="https://github.com/Schweigi/assembler-simulator"><img style="z-index:1001;position: absolute; top: 0; right: 0; border: 0;" src="https://s3.amazonaws.com/github/ribbons/forkme_right_red_aa0000.png" alt="Fork me on GitHub"></a>
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<nav class="navbar navbar-inverse" role="navigation" style="background-color:#428BCA;border:0px;border-radius:0px;">
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<div class="container">
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<div class="navbar-header">
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<a type="button" class="btn btn-default navbar-btn" href="index.html">Back to simulator</a>
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</div>
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<div class="navbar-header navbar-right">
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<a class="navbar-brand" style="color:#FFFFFF">Simple 8-bit Assembler Simulator</a>
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</div>
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</div>
|
||||
</nav>
|
||||
<div class="container">
|
||||
<h4>Introduction</h4>
|
||||
<p>This simulator provides a simplified assembler syntax (based on <a href="http://www.nasm.us" target="_blank">NASM</a>) and is simulating a x86 like cpu. In depth documentation and introduction to assembler can be found on the following websites:</p>
|
||||
<ul>
|
||||
<li><a href="http://en.wikipedia.org/wiki/Assembly_language" target="_blank">Assembly - Wikipedia</a></li>
|
||||
<li><a href="http://cs.smith.edu/~thiebaut/ArtOfAssembly/artofasm.html" target="_blank">The Art of Assembly Language Programming</a></li>
|
||||
<li><a href="http://www.nasm.us/xdoc/2.10.09/html/nasmdoc3.html" target="_blank">NASM Language Documentation</a></li>
|
||||
</ul>
|
||||
<p>The simulator consists of a 8-bit cpu and 256 bytes of memory. All instructions (code) and variables (data) needs to fit inside the memory. For simplicity every instruction (and operand) is 1 byte. Therefore a MOV instruction will use 3 bytes of memory. The simulator provides a console output which is memory mapped from 0xE8 to 0xFF. Memory mapped means that every value written to this memory block is visible on the console.</p>
|
||||
<h4>Syntax</h4>
|
||||
<p>The syntax is similar as most assemblers are using. Every instruction must be on their own line. Labels are optional and must either start with a letter or a dot (.) and end with a colon.</p>
|
||||
<pre>label: instruction operands ; Comment</pre>
|
||||
<p>Valid number formats for constants are:</p>
|
||||
<pre>
|
||||
Decimal: 200
|
||||
Decimal: 200d
|
||||
|
|
@ -34,12 +38,12 @@ Hex: 0xA4
|
|||
Octal: 0o48
|
||||
Binary: 101b
|
||||
</pre>
|
||||
<p>It is possible to define a number using a character or multiple numbers (see instruction <i>DB</i>) by using a string.</p>
|
||||
<p>It is possible to define a number using a character or multiple numbers (see instruction <i>DB</i>) by using a string.</p>
|
||||
<pre>
|
||||
Character: 'A'
|
||||
String: "Hello World!"
|
||||
</pre>
|
||||
<p>Operands can either be one of the four general purpose registers, a memory address or a constant. Instead of defining an address as a constant or by using a register you can use labels. The assembler will then replace the label with the corresponding constant.</p>
|
||||
<p>Operands can either be one of the four general purpose registers, a memory address or a constant. Instead of defining an address as a constant or by using a register you can use labels. The assembler will then replace the label with the corresponding constant.</p>
|
||||
<pre>
|
||||
Register: A, B, C, D
|
||||
Address using a register: [A]
|
||||
|
|
@ -47,8 +51,8 @@ Address using a constant: [100]
|
|||
Address using a label: label
|
||||
Constant: Any number between 0-255 (8bit unsigned)
|
||||
</pre>
|
||||
<h4>MOV - Copy a value</h4>
|
||||
<p>Copies a value from <i>src</i> to <i>dest</i>. The MOV instruction is the only one able to directly modify the memory.</p>
|
||||
<h4>MOV - Copy a value</h4>
|
||||
<p>Copies a value from <i>src</i> to <i>dest</i>. The MOV instruction is the only one able to directly modify the memory.</p>
|
||||
<pre>
|
||||
MOV reg, reg
|
||||
MOV reg, address
|
||||
|
|
@ -56,14 +60,14 @@ MOV reg, constant
|
|||
MOV address, reg
|
||||
MOV address, constant
|
||||
</pre>
|
||||
<h4>DB - Variable</h4>
|
||||
<p>Defines a variable. A variable can either be a single number, character or a string.</p>
|
||||
<h4>DB - Variable</h4>
|
||||
<p>Defines a variable. A variable can either be a single number, character or a string.</p>
|
||||
<pre>
|
||||
DB constant
|
||||
</pre>
|
||||
<h4>Math operations</h4>
|
||||
<b>Addition and Subtraction</b>
|
||||
<p>Adds two numbers together or subtract one number form another. This operations will modify the carry and zero flag.</p>
|
||||
<h4>Math operations</h4>
|
||||
<b>Addition and Subtraction</b>
|
||||
<p>Adds two numbers together or subtract one number form another. This operations will modify the carry and zero flag.</p>
|
||||
<pre>
|
||||
ADD reg, reg
|
||||
ADD reg, address
|
||||
|
|
@ -72,14 +76,14 @@ SUB reg, reg
|
|||
SUB reg, address
|
||||
SUB reg, constant
|
||||
</pre>
|
||||
<b>Increment and Decrement</b>
|
||||
<p>Increments or decrements a register by one. This operations will modify the carry and zero flag.</p>
|
||||
<b>Increment and Decrement</b>
|
||||
<p>Increments or decrements a register by one. This operations will modify the carry and zero flag.</p>
|
||||
<pre>
|
||||
INC reg
|
||||
DEC reg
|
||||
</pre>
|
||||
<b>Multiplication and division</b>
|
||||
<p>Multiplies or divides the <i>A</i> register with the given value. This operations will modify the carry and zero flag.</p>
|
||||
<b>Multiplication and division</b>
|
||||
<p>Multiplies or divides the <i>A</i> register with the given value. This operations will modify the carry and zero flag.</p>
|
||||
<pre>
|
||||
MUL reg
|
||||
MUL address
|
||||
|
|
@ -88,8 +92,8 @@ DIV reg
|
|||
DIV address
|
||||
DIV constant
|
||||
</pre>
|
||||
<b>Logical instructions</b>
|
||||
<p>The following logical instructions are supported: AND, OR, XOR, NOT. This operations will modify the carry and zero flag.</p>
|
||||
<b>Logical instructions</b>
|
||||
<p>The following logical instructions are supported: AND, OR, XOR, NOT. This operations will modify the carry and zero flag.</p>
|
||||
<pre>
|
||||
AND reg, reg
|
||||
AND reg, address
|
||||
|
|
@ -102,8 +106,8 @@ XOR reg, address
|
|||
XOR reg, constant
|
||||
NOT reg
|
||||
</pre>
|
||||
<b>Shift instructions</b>
|
||||
<p>The following shift instructions are supported: SHL/SAL and SHR/SAR. As this simulator only supports unsigned numbers SHR and SAR yield the same result. This operations will modify the carry and zero flag.</p>
|
||||
<b>Shift instructions</b>
|
||||
<p>The following shift instructions are supported: SHL/SAL and SHR/SAR. As this simulator only supports unsigned numbers SHR and SAR yield the same result. This operations will modify the carry and zero flag.</p>
|
||||
<pre>
|
||||
SHL reg, reg
|
||||
SHL reg, address
|
||||
|
|
@ -112,147 +116,142 @@ SHR reg, reg
|
|||
SHR reg, address
|
||||
SHR reg, constant
|
||||
</pre>
|
||||
<h4>CMP - Compare</h4>
|
||||
<p>Compares two values and sets the zero flag to true if they are equal. Use this instruction before a conditional jump.</p>
|
||||
<h4>CMP - Compare</h4>
|
||||
<p>Compares two values and sets the zero flag to true if they are equal. Use this instruction before a conditional jump.</p>
|
||||
<pre>
|
||||
CMP reg, reg
|
||||
CMP reg, address
|
||||
CMP reg, constant
|
||||
</pre>
|
||||
<h4>Jumps</h4>
|
||||
<b>JMP - Unconditional jump</b>
|
||||
<p>Let the instruction pointer do a unconditional jump to the defined address.</p>
|
||||
<h4>Jumps</h4>
|
||||
<b>JMP - Unconditional jump</b>
|
||||
<p>Let the instruction pointer do a unconditional jump to the defined address.</p>
|
||||
<pre>
|
||||
JMP address
|
||||
</pre>
|
||||
<b>Conditional jumps</b>
|
||||
<p>Let the instruction pointer do a conditional jump to the defined address. See the table below for the available conditions.</p>
|
||||
<table class="table table-condensed table-striped">
|
||||
<thead>
|
||||
<tr>
|
||||
<th>Instruction</th>
|
||||
<th>Description</th>
|
||||
<th>Condition</th>
|
||||
<th>Alternatives</th>
|
||||
</tr>
|
||||
</thead>
|
||||
<tbody>
|
||||
<tr>
|
||||
<td>JC</td>
|
||||
<td>Jump if carry</td>
|
||||
<td>Carry = TRUE</td>
|
||||
<td>JB, JNAE</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>JNC</td>
|
||||
<td>Jump if no carry</td>
|
||||
<td>Carry = FALSE</td>
|
||||
<td>JNB, JAE</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>JZ</td>
|
||||
<td>Jump if zero</td>
|
||||
<td>Zero = TRUE</td>
|
||||
<td>JB, JE</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>JNZ</td>
|
||||
<td>Jump if no zero</td>
|
||||
<td>Zero = FALSE</td>
|
||||
<td>JNE</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>JA</td>
|
||||
<td>></td>
|
||||
<td>C = FALSE && Z = FALSE</td>
|
||||
<td>JNBE</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>JNBE</td>
|
||||
<td>not <=</td>
|
||||
<td>C = FALSE && Z = FALSE</td>
|
||||
<td>JA</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>JAE</td>
|
||||
<td>>=</td>
|
||||
<td>Carry = FALSE</td>
|
||||
<td>JNC, JNB</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>JNB</td>
|
||||
<td>not <</td>
|
||||
<td>Carry = FALSE</td>
|
||||
<td>JNC, JAE</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>JB</td>
|
||||
<td><</td>
|
||||
<td>Carry = TRUE</td>
|
||||
<td>JC, JNAE</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>JNAE</td>
|
||||
<td>not >=</td>
|
||||
<td>Carry = TRUE</td>
|
||||
<td>JC, JB</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>JBE</td>
|
||||
<td><=</td>
|
||||
<td>C = TRUE or Z = TRUE</td>
|
||||
<td>JNA</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>JNA</td>
|
||||
<td>not ></td>
|
||||
<td>C = TRUE or Z = TRUE</td>
|
||||
<td>JBE</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>JE</td>
|
||||
<td>=</td>
|
||||
<td>Z = TRUE</td>
|
||||
<td>JZ</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>JNE</td>
|
||||
<td>!=</td>
|
||||
<td>Z = FALSE</td>
|
||||
<td>JNZ</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<b>CALL - Function call</b>
|
||||
<p>Call can be used to jump into a subroutine (function). Pushes the instruction address of the next instruction to the stack and jumps to the specified address.</p>
|
||||
<b>Conditional jumps</b>
|
||||
<p>Let the instruction pointer do a conditional jump to the defined address. See the table below for the available conditions.</p>
|
||||
<table class="table table-condensed table-striped">
|
||||
<thead>
|
||||
<tr>
|
||||
<th>Instruction</th>
|
||||
<th>Description</th>
|
||||
<th>Condition</th>
|
||||
<th>Alternatives</th>
|
||||
</tr>
|
||||
</thead>
|
||||
<tbody>
|
||||
<tr>
|
||||
<td>JC</td>
|
||||
<td>Jump if carry</td>
|
||||
<td>Carry = TRUE</td>
|
||||
<td>JB, JNAE</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>JNC</td>
|
||||
<td>Jump if no carry</td>
|
||||
<td>Carry = FALSE</td>
|
||||
<td>JNB, JAE</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>JZ</td>
|
||||
<td>Jump if zero</td>
|
||||
<td>Zero = TRUE</td>
|
||||
<td>JB, JE</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>JNZ</td>
|
||||
<td>Jump if no zero</td>
|
||||
<td>Zero = FALSE</td>
|
||||
<td>JNE</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>JA</td>
|
||||
<td>></td>
|
||||
<td>Carry = FALSE && Zero = FALSE</td>
|
||||
<td>JNBE</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>JNBE</td>
|
||||
<td>not <=</td>
|
||||
<td>Carry = FALSE && Zero = FALSE</td>
|
||||
<td>JA</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>JAE</td>
|
||||
<td>>=</td>
|
||||
<td>Carry = FALSE</td>
|
||||
<td>JNC, JNB</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>JNB</td>
|
||||
<td>not <</td>
|
||||
<td>Carry = FALSE</td>
|
||||
<td>JNC, JAE</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>JB</td>
|
||||
<td><</td>
|
||||
<td>Carry = TRUE</td>
|
||||
<td>JC, JNAE</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>JNAE</td>
|
||||
<td>not >=</td>
|
||||
<td>Carry = TRUE</td>
|
||||
<td>JC, JB</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>JBE</td>
|
||||
<td><=</td>
|
||||
<td>C = TRUE or Z = TRUE</td>
|
||||
<td>JNA</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>JNA</td>
|
||||
<td>not ></td>
|
||||
<td>C = TRUE or Z = TRUE</td>
|
||||
<td>JBE</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>JE</td>
|
||||
<td>=</td>
|
||||
<td>Z = TRUE</td>
|
||||
<td>JZ</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>JNE</td>
|
||||
<td>!=</td>
|
||||
<td>Z = FALSE</td>
|
||||
<td>JNZ</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<b>CALL - Function call</b>
|
||||
<p>Call can be used to jump into a subroutine (function). Pushes the instruction address of the next instruction to the stack and jumps to the specified address.</p>
|
||||
<pre>
|
||||
CALL address
|
||||
</pre>
|
||||
<b>RET - Exit a subroutine</b>
|
||||
<p>Exits a subroutines by popping the return address previously pushed by the CALL instruction. Make sure the SP is balanced before calling RET otherwise the instruction pointer will have an ambiguous value.</p>
|
||||
<b>RET - Exit a subroutine</b>
|
||||
<p>Exits a subroutines by popping the return address previously pushed by the CALL instruction. Make sure the SP is balanced before calling RET otherwise the instruction pointer will have an ambiguous value.</p>
|
||||
<pre>
|
||||
RET
|
||||
</pre>
|
||||
<h4>Stack instructions</h4>
|
||||
<b>PUSH - Push to stack</b>
|
||||
<p>Pushes a value to the stack. The stack grows down and the current position is available in the stack pointer register (SP). This instruction will decrease the SP.</p>
|
||||
<h4>Stack instructions</h4>
|
||||
<b>PUSH - Push to stack</b>
|
||||
<p>Pushes a value to the stack. The stack grows down and the current position is available in the stack pointer register (SP). This instruction will decrease the SP.</p>
|
||||
<pre>
|
||||
PUSH reg
|
||||
PUSH address
|
||||
PUSH constant
|
||||
</pre>
|
||||
<b>POP - Pop from stack</b>
|
||||
<p>Pops a value from the stack to a register. This instruction will increase the SP.</p>
|
||||
<b>POP - Pop from stack</b>
|
||||
<p>Pops a value from the stack to a register. This instruction will increase the SP.</p>
|
||||
<pre>
|
||||
POP reg
|
||||
</pre>
|
||||
</div>
|
||||
</div><!-- /.modal-content -->
|
||||
</div><!-- /.modal-dialog -->
|
||||
|
||||
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
|
||||
<script src="https://netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
|
||||
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.0-rc.3/angular.js"></script>
|
||||
<script src="assets/asmsimulator.js"></script>
|
||||
<hr style="margin-bottom:10px;"/>
|
||||
<p><small>by Marco Schweighauser (2013) | MIT License</small></p>
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
Loading…
Reference in New Issue