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Document the assembler's .dc, .dcb and .ds directives.

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* doc/as.texinfo (Pseudo Ops): Add nodes for .dc, .dcb and .ds.
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Nick Clifton 2018-02-23 10:43:53 +00:00
parent e859f6558c
commit 340d33e565
2 changed files with 107 additions and 5 deletions
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@ -1,3 +1,7 @@
2018-02-23 Nick Clifton <nickc@redhat.com>
* doc/as.texinfo (Pseudo Ops): Add nodes for .dc, .dcb and .ds.
2018-02-23 Kuan-Lin Chen <kuanlinchentw@gmail.com>
* config/tc-nds32.c (ict_model): New function. Hook new

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gas/doc/as.texinfo
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@ -4404,6 +4404,9 @@ Some machine configurations provide additional directives.
* CFI directives:: @code{.cfi_startproc [simple]}, @code{.cfi_endproc}, etc.
* Comm:: @code{.comm @var{symbol} , @var{length} }
* Data:: @code{.data @var{subsection}}
* Dc:: @code{.dc[@var{size}] @var{expressions}}
* Dcb:: @code{.dcb[@var{size}] @var{number} [,@var{fill}]}
* Ds:: @code{.ds[@var{size}] @var{number} [,@var{fill}]}
@ifset COFF
* Def:: @code{.def @var{name}}
@end ifset
@ -4518,12 +4521,12 @@ Some machine configurations provide additional directives.
* Size:: @code{.size [@var{name} , @var{expression}]}
@end ifset
@ifclear no-space-dir
* Skip:: @code{.skip @var{size} , @var{fill}}
* Skip:: @code{.skip @var{size} [,@var{fill}]}
@end ifclear
* Sleb128:: @code{.sleb128 @var{expressions}}
@ifclear no-space-dir
* Space:: @code{.space @var{size} , @var{fill}}
* Space:: @code{.space @var{size} [,@var{fill}]}
@end ifclear
@ifset have-stabs
* Stab:: @code{.stabd, .stabn, .stabs}
@ -5050,13 +5053,108 @@ The syntax for @code{.comm} differs slightly on the HPPA. The syntax is
@node Data
@section @code{.data @var{subsection}}
@cindex @code{data} directive
@code{.data} tells @command{@value{AS}} to assemble the following statements onto the
end of the data subsection numbered @var{subsection} (which is an
absolute expression). If @var{subsection} is omitted, it defaults
to zero.
@node Dc
@section @code{.dc[@var{size}] @var{expressions}}
@cindex @code{dc} directive
The @code{.dc} directive expects zero of more @var{expressions} separated by
commas. These expressions are evaluated and their values inserted into the
current section. The size of the emitted value depends upon the suffix to the
@code{.dc} directive:
@table @code
@item @samp{.a}
Emits N-bit values, where N is the size of an address on the target system.
@item @samp{.b}
Emits 8-bit values.
@item @samp{.d}
Emits double precision floating-point values.
@item @samp{.l}
Emits 32-bit values.
@item @samp{.s}
Emits single precision floating-point values.
@item @samp{.w}
Emits 16-bit values.
Note - this is true even on targets where the @code{.word} directive would emit
32-bit values.
@item @samp{.x}
Emits long double precision floating-point values.
@end table
If no suffix is used then @samp{.w} is assumed.
The byte ordering is still target dependent, as is the size and format of
floating point values.
@node Dcb
@section @code{.dcb[@var{size}] @var{number} [,@var{fill}]}
@cindex @code{dcb} directive
This directive emits @var{number} copies of @var{fill}, each of @var{size}
bytes. Both @var{number} and @var{fill} are absolute expressions. If the
comma and @var{fill} are omitted, @var{fill} is assumed to be zero. The
@var{size} suffix, if present, must be one of:
@table @code
@item @samp{.b}
Emits single byte values.
@item @samp{.d}
Emits double-precision floating point values.
@item @samp{.l}
Emits 4-byte values.
@item @samp{.s}
Emits single-precision floating point values.
@item @samp{.w}
Emits 2-byte values.
@item @samp{.x}
Emits long double-precision floating point values.
@end table
If the @var{size} suffix is omitted then @samp{.w} is assumed.
The byte ordering is target dependent, as is the size and format of floating
point values.
@node Ds
@section @code{.ds[@var{size}] @var{number} [,@var{fill}]}
@cindex @code{ds} directive
This directive emits @var{number} copies of @var{fill}, each of @var{size}
bytes. Both @var{number} and @var{fill} are absolute expressions. If the
comma and @var{fill} are omitted, @var{fill} is assumed to be zero. The
@var{size} suffix, if present, must be one of:
@table @code
@item @samp{.b}
Emits single byte values.
@item @samp{.d}
Emits 8-byte values.
@item @samp{.l}
Emits 4-byte values.
@item @samp{.p}
Emits 12-byte values.
@item @samp{.s}
Emits 4-byte values.
@item @samp{.w}
Emits 2-byte values.
@item @samp{.x}
Emits 12-byte values.
@end table
Note - unlike the @code{.dcb} directive the @samp{.d}, @samp{.s} and @samp{.x}
suffixes do not indicate that floating-point values are to inserted.
If the @var{size} suffix is omitted then @samp{.w} is assumed.
The byte ordering is target dependent, as is the size and format of floating
point values.
@ifset COFF
@node Def
@section @code{.def @var{name}}
@ -6831,7 +6929,7 @@ symbols.
@ifclear no-space-dir
@node Skip
@section @code{.skip @var{size} , @var{fill}}
@section @code{.skip @var{size} [,@var{fill}]}
@cindex @code{skip} directive
@cindex filling memory
@ -6851,7 +6949,7 @@ symbolic debugging format. @xref{Uleb128, ,@code{.uleb128}}.
@ifclear no-space-dir
@node Space
@section @code{.space @var{size} , @var{fill}}
@section @code{.space @var{size} [,@var{fill}]}
@cindex @code{space} directive
@cindex filling memory