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* doc/as.texinfo (Pseudo Ops): Swap order of Comm and CFI menu entries.
(Altmacro, Comm, Loc, Loc_mark_labels, List, MRI, PopSection, Sleb128): Moved into alphabetical order.
This commit is contained in:
Bob Wilson
parent
884f0d36b4
commit
ccf8a69b9c
@ -1,3 +1,9 @@
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2008-10-09 Bob Wilson <bob.wilson@acm.org>
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* doc/as.texinfo (Pseudo Ops): Swap order of Comm and CFI menu entries.
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(Altmacro, Comm, Loc, Loc_mark_labels, List, MRI, PopSection, Sleb128):
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Moved into alphabetical order.
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2008-10-09 Bob Wilson <bob.wilson@acm.org>
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* doc/as.texinfo (Dot): Expand no-space-dir conditional to include
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@ -3808,10 +3808,8 @@ Some machine configurations provide additional directives.
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* Asciz:: @code{.asciz "@var{string}"}@dots{}
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* Balign:: @code{.balign @var{abs-expr} , @var{abs-expr}}
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* Byte:: @code{.byte @var{expressions}}
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* Comm:: @code{.comm @var{symbol} , @var{length} }
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* CFI directives:: @code{.cfi_startproc [simple]}, @code{.cfi_endproc}, etc.
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* Comm:: @code{.comm @var{symbol} , @var{length} }
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* Data:: @code{.data @var{subsection}}
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@ifset COFF
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* Def:: @code{.def @var{name}}
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@ -4040,6 +4038,42 @@ GAS also provides @code{.balign} and @code{.p2align} directives,
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described later, which have a consistent behavior across all
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architectures (but are specific to GAS).
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@node Altmacro
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@section @code{.altmacro}
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Enable alternate macro mode, enabling:
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@ftable @code
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@item LOCAL @var{name} [ , @dots{} ]
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One additional directive, @code{LOCAL}, is available. It is used to
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generate a string replacement for each of the @var{name} arguments, and
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replace any instances of @var{name} in each macro expansion. The
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replacement string is unique in the assembly, and different for each
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separate macro expansion. @code{LOCAL} allows you to write macros that
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define symbols, without fear of conflict between separate macro expansions.
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@item String delimiters
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You can write strings delimited in these other ways besides
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@code{"@var{string}"}:
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@table @code
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@item '@var{string}'
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You can delimit strings with single-quote characters.
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@item <@var{string}>
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You can delimit strings with matching angle brackets.
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@end table
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@item single-character string escape
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To include any single character literally in a string (even if the
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character would otherwise have some special meaning), you can prefix the
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character with @samp{!} (an exclamation mark). For example, you can
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write @samp{<4.3 !> 5.4!!>} to get the literal text @samp{4.3 > 5.4!}.
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@item Expression results as strings
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You can write @samp{%@var{expr}} to evaluate the expression @var{expr}
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and use the result as a string.
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@end ftable
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@node Ascii
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@section @code{.ascii "@var{string}"}@dots{}
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@ -4102,37 +4136,6 @@ undefined.
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@code{.byte} expects zero or more expressions, separated by commas.
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Each expression is assembled into the next byte.
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@node Comm
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@section @code{.comm @var{symbol} , @var{length} }
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@cindex @code{comm} directive
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@cindex symbol, common
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@code{.comm} declares a common symbol named @var{symbol}. When linking, a
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common symbol in one object file may be merged with a defined or common symbol
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of the same name in another object file. If @code{@value{LD}} does not see a
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definition for the symbol--just one or more common symbols--then it will
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allocate @var{length} bytes of uninitialized memory. @var{length} must be an
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absolute expression. If @code{@value{LD}} sees multiple common symbols with
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the same name, and they do not all have the same size, it will allocate space
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using the largest size.
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@ifset ELF
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When using ELF, the @code{.comm} directive takes an optional third argument.
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This is the desired alignment of the symbol, specified as a byte boundary (for
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example, an alignment of 16 means that the least significant 4 bits of the
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address should be zero). The alignment must be an absolute expression, and it
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must be a power of two. If @code{@value{LD}} allocates uninitialized memory
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for the common symbol, it will use the alignment when placing the symbol. If
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no alignment is specified, @command{@value{AS}} will set the alignment to the
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largest power of two less than or equal to the size of the symbol, up to a
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maximum of 16.
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@end ifset
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@ifset HPPA
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The syntax for @code{.comm} differs slightly on the HPPA. The syntax is
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@samp{@var{symbol} .comm, @var{length}}; @var{symbol} is optional.
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@end ifset
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@node CFI directives
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@section @code{.cfi_startproc [simple]}
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@cindex @code{cfi_startproc} directive
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@ -4246,51 +4249,36 @@ mark a code segment that has only one return address which is reached
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by a direct branch and no copy of the return address exists in memory
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or another register.
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@node Loc
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@section @code{.loc @var{fileno} @var{lineno} [@var{column}] [@var{options}]}
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@cindex @code{loc} directive
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When emitting DWARF2 line number information,
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the @code{.loc} directive will add a row to the @code{.debug_line} line
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number matrix corresponding to the immediately following assembly
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instruction. The @var{fileno}, @var{lineno}, and optional @var{column}
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arguments will be applied to the @code{.debug_line} state machine before
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the row is added.
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@node Comm
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@section @code{.comm @var{symbol} , @var{length} }
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The @var{options} are a sequence of the following tokens in any order:
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@cindex @code{comm} directive
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@cindex symbol, common
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@code{.comm} declares a common symbol named @var{symbol}. When linking, a
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common symbol in one object file may be merged with a defined or common symbol
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of the same name in another object file. If @code{@value{LD}} does not see a
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definition for the symbol--just one or more common symbols--then it will
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allocate @var{length} bytes of uninitialized memory. @var{length} must be an
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absolute expression. If @code{@value{LD}} sees multiple common symbols with
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the same name, and they do not all have the same size, it will allocate space
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using the largest size.
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@table @code
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@item basic_block
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This option will set the @code{basic_block} register in the
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@code{.debug_line} state machine to @code{true}.
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@ifset ELF
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When using ELF, the @code{.comm} directive takes an optional third argument.
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This is the desired alignment of the symbol, specified as a byte boundary (for
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example, an alignment of 16 means that the least significant 4 bits of the
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address should be zero). The alignment must be an absolute expression, and it
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must be a power of two. If @code{@value{LD}} allocates uninitialized memory
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for the common symbol, it will use the alignment when placing the symbol. If
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no alignment is specified, @command{@value{AS}} will set the alignment to the
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largest power of two less than or equal to the size of the symbol, up to a
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maximum of 16.
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@end ifset
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@item prologue_end
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This option will set the @code{prologue_end} register in the
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@code{.debug_line} state machine to @code{true}.
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@item epilogue_begin
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This option will set the @code{epilogue_begin} register in the
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@code{.debug_line} state machine to @code{true}.
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@item is_stmt @var{value}
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This option will set the @code{is_stmt} register in the
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@code{.debug_line} state machine to @code{value}, which must be
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either 0 or 1.
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@item isa @var{value}
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This directive will set the @code{isa} register in the @code{.debug_line}
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state machine to @var{value}, which must be an unsigned integer.
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@end table
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@node Loc_mark_labels
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@section @code{.loc_mark_labels @var{enable}}
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@cindex @code{loc_mark_labels} directive
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When emitting DWARF2 line number information,
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the @code{.loc_mark_labels} directive makes the assembler emit an entry
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to the @code{.debug_line} line number matrix with the @code{basic_block}
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register in the state machine set whenever a code label is seen.
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The @var{enable} argument should be either 1 or 0, to enable or disable
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this function respectively.
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@ifset HPPA
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The syntax for @code{.comm} differs slightly on the HPPA. The syntax is
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@samp{@var{symbol} .comm, @var{length}}; @var{symbol} is optional.
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@end ifset
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@node Data
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@section @code{.data @var{subsection}}
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@ -5005,6 +4993,21 @@ Warn if any of the duplicates have different sizes.
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Warn if any of the duplicates do not have exactly the same contents.
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@end table
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@node List
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@section @code{.list}
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@cindex @code{list} directive
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@cindex listing control, turning on
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Control (in conjunction with the @code{.nolist} directive) whether or
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not assembly listings are generated. These two directives maintain an
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internal counter (which is zero initially). @code{.list} increments the
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counter, and @code{.nolist} decrements it. Assembly listings are
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generated whenever the counter is greater than zero.
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By default, listings are disabled. When you enable them (with the
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@samp{-a} command line option; @pxref{Invoking,,Command-Line Options}),
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the initial value of the listing counter is one.
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@node Ln
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@section @code{.ln @var{line-number}}
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@ -5026,15 +5029,51 @@ output format.
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@end ifset
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@end ifset
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@node MRI
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@section @code{.mri @var{val}}
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@node Loc
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@section @code{.loc @var{fileno} @var{lineno} [@var{column}] [@var{options}]}
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@cindex @code{loc} directive
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When emitting DWARF2 line number information,
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the @code{.loc} directive will add a row to the @code{.debug_line} line
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number matrix corresponding to the immediately following assembly
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instruction. The @var{fileno}, @var{lineno}, and optional @var{column}
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arguments will be applied to the @code{.debug_line} state machine before
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the row is added.
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@cindex @code{mri} directive
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@cindex MRI mode, temporarily
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If @var{val} is non-zero, this tells @command{@value{AS}} to enter MRI mode. If
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@var{val} is zero, this tells @command{@value{AS}} to exit MRI mode. This change
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affects code assembled until the next @code{.mri} directive, or until the end
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of the file. @xref{M, MRI mode, MRI mode}.
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The @var{options} are a sequence of the following tokens in any order:
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@table @code
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@item basic_block
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This option will set the @code{basic_block} register in the
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@code{.debug_line} state machine to @code{true}.
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@item prologue_end
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This option will set the @code{prologue_end} register in the
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@code{.debug_line} state machine to @code{true}.
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@item epilogue_begin
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This option will set the @code{epilogue_begin} register in the
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@code{.debug_line} state machine to @code{true}.
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@item is_stmt @var{value}
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This option will set the @code{is_stmt} register in the
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@code{.debug_line} state machine to @code{value}, which must be
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either 0 or 1.
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@item isa @var{value}
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This directive will set the @code{isa} register in the @code{.debug_line}
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state machine to @var{value}, which must be an unsigned integer.
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@end table
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@node Loc_mark_labels
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@section @code{.loc_mark_labels @var{enable}}
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@cindex @code{loc_mark_labels} directive
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When emitting DWARF2 line number information,
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the @code{.loc_mark_labels} directive makes the assembler emit an entry
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to the @code{.debug_line} line number matrix with the @code{basic_block}
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register in the state machine set whenever a code label is seen.
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The @var{enable} argument should be either 1 or 0, to enable or disable
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this function respectively.
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@ifset ELF
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@node Local
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@ -5052,21 +5091,6 @@ the @code{.local} directive can be used in combination with @code{.comm}
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(@pxref{Comm}) to define aligned local common data.
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@end ifset
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@node List
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@section @code{.list}
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@cindex @code{list} directive
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@cindex listing control, turning on
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Control (in conjunction with the @code{.nolist} directive) whether or
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not assembly listings are generated. These two directives maintain an
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internal counter (which is zero initially). @code{.list} increments the
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counter, and @code{.nolist} decrements it. Assembly listings are
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generated whenever the counter is greater than zero.
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By default, listings are disabled. When you enable them (with the
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@samp{-a} command line option; @pxref{Invoking,,Command-Line Options}),
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the initial value of the listing counter is one.
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@node Long
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@section @code{.long @var{expressions}}
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@ -5268,41 +5292,15 @@ macro syntax'' with @samp{--alternate} or @code{.altmacro}.}
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@xref{Altmacro,,@code{.altmacro}}.
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@end ftable
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@node Altmacro
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@section @code{.altmacro}
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Enable alternate macro mode, enabling:
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@node MRI
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@section @code{.mri @var{val}}
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@ftable @code
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@item LOCAL @var{name} [ , @dots{} ]
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One additional directive, @code{LOCAL}, is available. It is used to
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generate a string replacement for each of the @var{name} arguments, and
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replace any instances of @var{name} in each macro expansion. The
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replacement string is unique in the assembly, and different for each
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separate macro expansion. @code{LOCAL} allows you to write macros that
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define symbols, without fear of conflict between separate macro expansions.
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@item String delimiters
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You can write strings delimited in these other ways besides
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@code{"@var{string}"}:
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@table @code
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@item '@var{string}'
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You can delimit strings with single-quote characters.
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@item <@var{string}>
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You can delimit strings with matching angle brackets.
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@end table
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@item single-character string escape
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To include any single character literally in a string (even if the
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character would otherwise have some special meaning), you can prefix the
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character with @samp{!} (an exclamation mark). For example, you can
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write @samp{<4.3 !> 5.4!!>} to get the literal text @samp{4.3 > 5.4!}.
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@item Expression results as strings
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You can write @samp{%@var{expr}} to evaluate the expression @var{expr}
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and use the result as a string.
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@end ftable
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@cindex @code{mri} directive
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@cindex MRI mode, temporarily
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If @var{val} is non-zero, this tells @command{@value{AS}} to enter MRI mode. If
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@var{val} is zero, this tells @command{@value{AS}} to exit MRI mode. This change
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affects code assembled until the next @code{.mri} directive, or until the end
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of the file. @xref{M, MRI mode, MRI mode}.
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@node Noaltmacro
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@section @code{.noaltmacro}
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@ -5405,6 +5403,22 @@ filled in with the value 0x368d (the exact placement of the bytes depends upon
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the endianness of the processor). If it skips 1 or 3 bytes, the fill value is
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undefined.
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@ifset ELF
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@node PopSection
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@section @code{.popsection}
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@cindex @code{popsection} directive
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@cindex Section Stack
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This is one of the ELF section stack manipulation directives. The others are
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@code{.section} (@pxref{Section}), @code{.subsection} (@pxref{SubSection}),
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@code{.pushsection} (@pxref{PushSection}), and @code{.previous}
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(@pxref{Previous}).
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This directive replaces the current section (and subsection) with the top
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section (and subsection) on the section stack. This section is popped off the
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stack.
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@end ifset
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@ifset ELF
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@node Previous
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@section @code{.previous}
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@ -5458,22 +5472,6 @@ In terms of the section stack, this directive swaps the current section with
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the top section on the section stack.
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@end ifset
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@ifset ELF
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@node PopSection
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@section @code{.popsection}
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@cindex @code{popsection} directive
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@cindex Section Stack
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This is one of the ELF section stack manipulation directives. The others are
|
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@code{.section} (@pxref{Section}), @code{.subsection} (@pxref{SubSection}),
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@code{.pushsection} (@pxref{PushSection}), and @code{.previous}
|
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(@pxref{Previous}).
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This directive replaces the current section (and subsection) with the top
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section (and subsection) on the section stack. This section is popped off the
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stack.
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@end ifset
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@node Print
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@section @code{.print @var{string}}
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@ -5931,14 +5929,6 @@ symbols.
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@end ifset
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@end ifset
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@node Sleb128
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@section @code{.sleb128 @var{expressions}}
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@cindex @code{sleb128} directive
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@var{sleb128} stands for ``signed little endian base 128.'' This is a
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compact, variable length representation of numbers used by the DWARF
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symbolic debugging format. @xref{Uleb128, ,@code{.uleb128}}.
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@ifclear no-space-dir
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@node Skip
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@section @code{.skip @var{size} , @var{fill}}
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@ -5951,6 +5941,14 @@ This directive emits @var{size} bytes, each of value @var{fill}. Both
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@samp{.space}.
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@end ifclear
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@node Sleb128
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@section @code{.sleb128 @var{expressions}}
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@cindex @code{sleb128} directive
|
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@var{sleb128} stands for ``signed little endian base 128.'' This is a
|
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compact, variable length representation of numbers used by the DWARF
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symbolic debugging format. @xref{Uleb128, ,@code{.uleb128}}.
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@ifclear no-space-dir
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@node Space
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@section @code{.space @var{size} , @var{fill}}
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