122 lines
3.5 KiB
Text
122 lines
3.5 KiB
Text
@c Copyright (C) 1991, 1992, 1993, 1994, 1995 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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@ifset GENERIC
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@page
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@node Sparc-Dependent
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@chapter SPARC 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 SPARC Dependent Features
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@end ifclear
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@cindex SPARC support
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@menu
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* Sparc-Opts:: Options
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* Sparc-Float:: Floating Point
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* Sparc-Directives:: Sparc Machine Directives
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@end menu
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@node Sparc-Opts
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@section Options
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@cindex options for SPARC
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@cindex SPARC options
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@cindex architectures, SPARC
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@cindex SPARC architectures
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The SPARC chip family includes several successive levels (or other
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variants) of chip, using the same core instruction set, but including
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a few additional instructions at each level.
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By default, @code{@value{AS}} assumes the core instruction set (SPARC
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v6), but ``bumps'' the architecture level as needed: it switches to
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successively higher architectures as it encounters instructions that
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only exist in the higher levels.
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@table @code
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@kindex -Av6
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@kindex Av7
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@kindex -Av8
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@kindex -Av9
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@kindex -Asparclite
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@item -Av6 | -Av7 | -Av8 | -Av9 | -Asparclite
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Use one of the @samp{-A} options to select one of the SPARC
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architectures explicitly. If you select an architecture explicitly,
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@code{@value{AS}} reports a fatal error if it encounters an instruction
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or feature requiring a higher level.
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@item -bump
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Permit the assembler to ``bump'' the architecture level as required, but
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warn whenever it is necessary to switch to another level.
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@end table
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@ignore
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@c FIXME: (sparc) Fill in "syntax" section!
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@c subsection syntax
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I don't know anything about Sparc syntax. Someone who does
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will have to write this section.
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@end ignore
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@node Sparc-Float
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@section Floating Point
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@cindex floating point, SPARC (@sc{ieee})
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@cindex SPARC floating point (@sc{ieee})
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The Sparc uses @sc{ieee} floating-point numbers.
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@node Sparc-Directives
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@section Sparc Machine Directives
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@cindex SPARC machine directives
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@cindex machine directives, SPARC
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The Sparc version of @code{@value{AS}} supports the following additional
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machine directives:
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@table @code
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@cindex @code{align} directive, SPARC
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@item .align
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This must be followed by the desired alignment in bytes.
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@cindex @code{common} directive, SPARC
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@item .common
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This must be followed by a symbol name, a positive number, and
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@code{"bss"}. This behaves somewhat like @code{.comm}, but the
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syntax is different.
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@cindex @code{half} directive, SPARC
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@item .half
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This is functionally identical to @code{.short}.
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@cindex @code{proc} directive, SPARC
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@item .proc
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This directive is ignored. Any text following it on the same
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line is also ignored.
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@cindex @code{reserve} directive, SPARC
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@item .reserve
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This must be followed by a symbol name, a positive number, and
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@code{"bss"}. This behaves somewhat like @code{.lcomm}, but the
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syntax is different.
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@cindex @code{seg} directive, SPARC
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@item .seg
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This must be followed by @code{"text"}, @code{"data"}, or
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@code{"data1"}. It behaves like @code{.text}, @code{.data}, or
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@code{.data 1}.
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@cindex @code{skip} directive, SPARC
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@item .skip
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This is functionally identical to the @code{.space} directive.
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@cindex @code{word} directive, SPARC
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@item .word
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On the Sparc, the @code{.word} directive produces 32 bit values,
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instead of the 16 bit values it produces on many other machines.
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@cindex @code{xword} directive, SPARC
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@item .xword
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On the Sparc V9 processor, the @code{.xword} directive produces
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64 bit values.
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@end table
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