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91 lines
2.5 KiB
Plaintext
91 lines
2.5 KiB
Plaintext
@c Copyright (C) 2014-2024 Free Software Foundation, Inc.
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@c This is part of the GAS manual.
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@c For copying conditions, see the file as.texinfo.
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@c man end
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@ifset GENERIC
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@page
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@node Visium-Dependent
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@chapter Visium Dependent Features
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@end ifset
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@ifclear GENERIC
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@node Machine Dependencies
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@chapter Visium Dependent Features
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@end ifclear
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@cindex Visium support
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@menu
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* Visium Options:: Options
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* Visium Syntax:: Syntax
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* Visium Opcodes:: Opcodes
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@end menu
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@node Visium Options
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@section Options
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@cindex Visium options
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@cindex options for Visium
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The Visium assembler implements one machine-specific option:
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@c man begin OPTIONS
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@table @gcctabopt
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@cindex @code{-mtune=@var{arch}} command-line option, Visium
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@item -mtune=@var{arch}
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This option specifies the target architecture. If an attempt is made to
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assemble an instruction that will not execute on the target architecture,
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the assembler will issue an error message.
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The following names are recognized:
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@code{mcm24}
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@code{mcm}
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@code{gr5}
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@code{gr6}
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@end table
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@c man end
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@node Visium Syntax
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@section Syntax
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@menu
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* Visium Characters:: Special Characters
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* Visium Registers:: Register Names
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@end menu
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@node Visium Characters
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@subsection Special Characters
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@cindex line comment character, Visium
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@cindex Visium line comment character
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Line comments are introduced either by the @samp{!} character or by the
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@samp{;} character appearing anywhere on a line.
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A hash character (@samp{#}) as the first character on a line also
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marks the start of a line comment, but in this case it could also be a
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logical line number directive (@pxref{Comments}) or a preprocessor
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control command (@pxref{Preprocessing}).
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@cindex line separator, Visium
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@cindex statement separator, Visium
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@cindex Visium line separator
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The Visium assembler does not currently support a line separator character.
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@node Visium Registers
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@subsection Register Names
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@cindex Visium registers
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@cindex register names, Visium
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Registers can be specified either by using their canonical mnemonic names
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or by using their alias if they have one, for example @samp{sp}.
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@node Visium Opcodes
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@section Opcodes
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All the standard opcodes of the architecture are implemented, along with the
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following three pseudo-instructions: @code{cmp}, @code{cmpc}, @code{move}.
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In addition, the following two illegal opcodes are implemented and used by the simulation:
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@example
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stop 5-bit immediate, SourceA
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trace 5-bit immediate, SourceA
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@end example
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