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Getting Started with x86 » History » Version 83

Alexander Kamkin, 04/06/2017 08:44 PM

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h1. Getting Started with x86
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{{toc}}
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h2. Prerequisite
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MicroTESK should be [[Installation Guide|installed]].
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h2. Demo Specifications
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Specifications of the x86 (8086) instruction set architecture (ISA) can be found in "$MICROTESK_HOME/arch/demo/x86/model/x86.nml":http://forge.ispras.ru/projects/microtesk/repository/entry/trunk/microtesk/src/main/arch/demo/x86/model/x86.nml.
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Instruction are described in [[nML Language Reference|nML]] by means of the following constructs (_move r16/r16_ is taken as an example):
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## the signature
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<pre><code class="c">op mov_r16r16 (dst: R16, src: R16)</code></pre>
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## the assembly format
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<pre><code class="c">syntax = format("mov %s, %s", dst.syntax, src.syntax)</code></pre>
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## the binary encoding
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<pre><code class="c">image = format("1000101111%s%s", dst.image, src.image)</code></pre>
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## the semantics
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<pre><code class="c">
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  action = {
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    dst = src;
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    ...
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  }
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</code></pre>
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To compile the ISA model, run the following command:
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<pre>sh $MICROTESK_HOME/bin/compile.sh x86.nml</pre>
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h2. Demo Templates
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Test templates for the x86 (8086) ISA can be found in "$MICROTESK_HOME/arch/demo/x86/templates":http://forge.ispras.ru/projects/microtesk/repository/entry/trunk/microtesk/src/main/arch/demo/x86/templates.
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The directory contains a number of demo templates including the following ones:
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{background:#f6fcff}. | "block.rb":http://forge.ispras.ru/projects/microtesk/repository/entry/trunk/microtesk/src/main/arch/demo/x86/templates/block.rb | demonstrates how to use block constructs |
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                      | "block_random.rb":http://forge.ispras.ru/projects/microtesk/repository/entry/trunk/microtesk/src/main/arch/demo/x86/templates/block_random.rb | demonstrates how to create randomized instruction sequences using block constructs |
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{background:#f6fcff}. | "euclid.rb":http://forge.ispras.ru/projects/microtesk/repository/entry/trunk/microtesk/src/main/arch/demo/x86/templates/euclid.rb | demonstrates test program simulation to predict the resulting microprocessor state |
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                      | "random.rb":http://forge.ispras.ru/projects/microtesk/repository/entry/trunk/microtesk/src/main/arch/demo/x86/templates/random.rb | demonstrates how to randomize tests by using biases and distributions |
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{background:#f6fcff}. | "random_immediate.rb":http://forge.ispras.ru/projects/microtesk/repository/entry/trunk/microtesk/src/main/arch/demo/x86/templates/random_immediate.rb | demonstrates how to randomize immediate values |
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                      | "random_registers.rb":http://forge.ispras.ru/projects/microtesk/repository/entry/trunk/microtesk/src/main/arch/demo/x86/templates/random_registers.rb | demonstrates how to randomize registers (dependencies) |
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Test templates are written in "Ruby":http://www.ruby-lang.org extended with specific [[Template_Description_Language|constructs]] (let us look at "block.rb":http://forge.ispras.ru/projects/microtesk/repository/entry/trunk/microtesk/src/main/arch/demo/x86/templates/block.rb):
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# the code in the beginning includes the "x86_base.rb":http://forge.ispras.ru/projects/microtesk/repository/entry/trunk/microtesk/src/main/arch/demo/x86/templates/x86_base.rb file where a base template @X86BaseTemplate@ is defined and declares a @BlockTemplate@ template:
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<pre><code class="ruby">
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require_relative ''x86_base''
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class BlockTemplate < X86BaseTemplate  # BlockTemplate is a heir of @X86BaseTemplate@
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</code></pre>
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# here is a template entry point:
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<pre><code class="ruby"> def run</code></pre>
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# this block produces a sequence consisting of three instructions:
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<pre><code class="ruby">
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  sequence { # {{mov, sub, add}}
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    mov_r16r16 ax, bx
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    sub_r16r16 cx, dx
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    add_r16r16 r16(_), r16(_)
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  }.run
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</code></pre>
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# this block produces an atomic sequence consisting of three instructions (atomic sequences are not interrupted while being merged with other ones):
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<pre><code class="ruby">
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  atomic { # {{mov, add, sub}}
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    mov_r16r16 ax, bx
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    add_r16r16 cx, dx
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    sub_r16r16 r16(_), r16(_)
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  }.run
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</code></pre>
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# this block produces three sequences each consisting of one instruction:
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<pre><code class="ruby">
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  iterate { # {{mov}, {sub}, {add}}
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    mov_r16r16 ax, bx
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    sub_r16r16 cx, dx
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    add_r16r16 r16(_), r16(_)
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  }.run
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</code></pre>
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# this block produces four sequences each consisting of two instructions
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~the combinator constructs the Cartesian product of the nested sets of sequences; the compositor randomly merges each tuple of the product into one sequence:~
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<pre><code class="ruby">
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  block(:combinator => ''product'',  # {({sub}, {mov}), ({sub}, {sub}), ({add}, {mov}), ({add}, {sub})}
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        :compositor => ''random'') { # {  {mov, sub},     {sub, sub},     {add, mov},     {add, sub}  }
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    iterate { # {{sub}, {add}}
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      sub_r16r16 cx, dx
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      add_r16r16 ax, bx
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    }
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    iterate { # {{mov}, {sub}}
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      mov_r16r16 ax, bx
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      sub_r16r16 r16(_), r16(_)
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    }
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  }.run
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</code></pre>
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# this block merges two sequences in a random fashion
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~the combinator constructs the diagonal of the Cartesian product; the compositor randomly merges the tuples into sequences; the obfuscator reorders the sequences:~
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<pre><code class="ruby">
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  block(:combinator => ''diagonal'', # {({sub, or}, {start, and, end})}
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        :compositor => ''random'',   # {  {sub, start, and, end, or}  }
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        :obfuscator => ''random'') { # {  {or, start, and, end, sub}  }
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    sequence { # {sub, or}
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      sub_r16r16 bx, ax
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      or_r16r16 cx, dx
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    }
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    atomic {   # {start, add, end}
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      prologue { comment ''Atomic starts'' }
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      epilogue { comment ''Atomic ends'' }
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      and_r16r16 r16(_), r16(_)
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    }
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  }.run
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</code></pre>
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To generate a test program from a test template (in our case, from @block.rb@), run the following command:
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<pre>sh $MICROTESK_HOME/bin/generate.sh x86 block.rb --code-file-prefix block --code-file-extension s -v</pre>
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When generation is finished, the resulting "assembly code":http://forge.ispras.ru/attachments/download/5127/block_0000.s can be found in @$MICROTESK_HOME@.
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To compile the test program, run the following commands:
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<pre>
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nasm -f elf block_0000.s
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ld -m i386pe -s -o block_0000 block_0000.o
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</pre>
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The test program can be executed in the "simulator":https://www.tutorialspoint.com/compile_assembly_online.php
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p=. !Example_block.png!