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Update to include descriptions of .popsection, .previous, .pushsection,

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.subsection, .version, .vtable_entry, .vtable_inherit and .weak.
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Nick Clifton 2000-08-04 20:39:01 +00:00
parent ff5a4f04a2
commit c91d2e08dc
2 changed files with 249 additions and 64 deletions
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@ -1,3 +1,9 @@
2000-08-04 Nick Clifton <nickc@cygnus.com>
* doc/as.texinfo (Pseudo Ops): Update to include descriptions
of .popsection, .previous, .pushsection, .subsection,
.version, .vtable_entry, .vtable_inherit and .weak.
2000-08-05 Kazu Hirata <kazu@hxi.com>
* config/tc-cris.c: Fix formatting.

307
gas/doc/as.texinfo
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@ -3181,7 +3181,6 @@ Some machine configurations provide additional directives.
@ifset COFF
* ABORT:: @code{.ABORT}
@end ifset
* Align:: @code{.align @var{abs-expr} , @var{abs-expr}}
* Ascii:: @code{.ascii "@var{string}"}@dots{}
* Asciz:: @code{.asciz "@var{string}"}@dots{}
@ -3198,7 +3197,6 @@ Some machine configurations provide additional directives.
@ifset COFF
* Dim:: @code{.dim}
@end ifset
* Double:: @code{.double @var{flonums}}
* Eject:: @code{.eject}
* Else:: @code{.else}
@ -3207,7 +3205,6 @@ Some machine configurations provide additional directives.
@ifset COFF
* Endef:: @code{.endef}
@end ifset
* Endfunc:: @code{.endfunc}
* Endif:: @code{.endif}
* Equ:: @code{.equ @var{symbol}, @var{expression}}
@ -3219,16 +3216,21 @@ Some machine configurations provide additional directives.
@ifclear no-file-dir
* File:: @code{.file @var{string}}
@end ifclear
* Fill:: @code{.fill @var{repeat} , @var{size} , @var{value}}
* Float:: @code{.float @var{flonums}}
* Func:: @code{.func}
* Global:: @code{.global @var{symbol}}, @code{.globl @var{symbol}}
@ifset ELF
* Hidden:: @code{.hidden @var{names}}
@end ifset
* hword:: @code{.hword @var{expressions}}
* Ident:: @code{.ident}
* If:: @code{.if @var{absolute expression}}
* Include:: @code{.include "@var{file}"}
* Int:: @code{.int @var{expressions}}
@ifset ELF
* Internal:: @code{.internal @var{names}}
@end ifset
* Irp:: @code{.irp @var{symbol},@var{values}}@dots{}
* Irpc:: @code{.irpc @var{symbol},@var{values}}@dots{}
* Lcomm:: @code{.lcomm @var{symbol} , @var{length}}
@ -3236,7 +3238,6 @@ Some machine configurations provide additional directives.
@ifclear no-line-dir
* Line:: @code{.line @var{line-number}}
@end ifclear
* Ln:: @code{.ln @var{line-number}}
* Linkonce:: @code{.linkonce [@var{type}]}
* List:: @code{.list}
@ -3244,17 +3245,25 @@ Some machine configurations provide additional directives.
@ignore
* Lsym:: @code{.lsym @var{symbol}, @var{expression}}
@end ignore
* Macro:: @code{.macro @var{name} @var{args}}@dots{}
* MRI:: @code{.mri @var{val}}
* Nolist:: @code{.nolist}
* Octa:: @code{.octa @var{bignums}}
* Org:: @code{.org @var{new-lc} , @var{fill}}
* P2align:: @code{.p2align @var{abs-expr} , @var{abs-expr}}
@ifset ELF
* PopSection:: @code{.popsection}
* Previous:: @code{.previous}
@end ifset
* Print:: @code{.print @var{string}}
@ifset ELF
* Protected:: @code{.protected @var{names}}
@end ifset
* Psize:: @code{.psize @var{lines}, @var{columns}}
* Purgem:: @code{.purgem @var{name}}
@ifset ELF
* PushSection:: @code{.pushsection @var{name}}
@end ifset
* Quad:: @code{.quad @var{bignums}}
* Rept:: @code{.rept @var{count}}
* Sbttl:: @code{.sbttl "@var{subheading}"}
@ -3262,45 +3271,47 @@ Some machine configurations provide additional directives.
* Scl:: @code{.scl @var{class}}
* Section:: @code{.section @var{name}, @var{subsection}}
@end ifset
* Set:: @code{.set @var{symbol}, @var{expression}}
* Short:: @code{.short @var{expressions}}
* Single:: @code{.single @var{flonums}}
@ifset COFF
* Size:: @code{.size}
@end ifset
* Size:: @code{.size [@var{name} , @var{expression}]}
* Skip:: @code{.skip @var{size} , @var{fill}}
* Sleb128:: @code{.sleb128 @var{expressions}}
* Space:: @code{.space @var{size} , @var{fill}}
@ifset have-stabs
* Stab:: @code{.stabd, .stabn, .stabs}
@end ifset
* String:: @code{.string "@var{str}"}
* Struct:: @code{.struct @var{expression}}
@ifset ELF
* SubSection:: @code{.subsection}
* Symver:: @code{.symver @var{name},@var{name2@@nodename}}
@end ifset
@ifset COFF
* Tag:: @code{.tag @var{structname}}
@end ifset
* Text:: @code{.text @var{subsection}}
* Title:: @code{.title "@var{heading}"}
* Type:: @code{.type <@var{int} | @var{name} , @var{type description}>}
* Uleb128:: @code{.uleb128 @var{expressions}}
@ifset COFF
* Type:: @code{.type @var{int}}
* Val:: @code{.val @var{addr}}
@end ifset
@ifset ELF
* Visibility:: @code{.internal @var{name}, .hidden @var{name}, .protected @var{name}}
* Version:: @code{.version "@var{string}"}
@end ifset
@ifset ELF
* VTableEntry:: @code{.vtable_entry @var{table}, @var{offset}}
* VTableInherit:: @code{.vtable_inherit @var{child}, @var{parent}}
@end ifset
@ifset ELF
* Weak:: @code{.weak @var{names}}
@end ifset
* Uleb128:: @code{.uleb128 @var{expressions}}
* Word:: @code{.word @var{expressions}}
* Deprecated:: Deprecated Directives
@end menu
@node Abort
@section @code{.abort}
@ -3754,6 +3765,21 @@ partial programs. You may need the HPPA-only @code{.EXPORT} directive as well.
@xref{HPPA Directives,, HPPA Assembler Directives}.
@end ifset
@ifset ELF
@node Hidden
@section @code{.hidden @var{names}}
@cindex @code{.hidden} directive
@cindex Visibility
This one of the ELF visibility directives. The other two are
@pxref{Internal,,@code{.internal}} and @pxref{Protected,,@code{.protected}}
This directive overrides the named symbols default visibility (which is set by
their binding: local, global or weak). The directive sets the visibility to
@code{hidden} which means that the symbols are not visible to other components.
Such symbols are always considered to be @code{protected} as well.
@end ifset
@node hword
@section @code{.hword @var{expressions}}
@ -3896,6 +3922,22 @@ integers. On the H8/300H and the Hitachi SH, however, @code{.int} emits
@end ifset
@end ifclear
@ifset ELF
@node Internal
@section @code{.internal @var{names}}
@cindex @code{.internal} directive
@cindex Visibility
This one of the ELF visibility directives. The other two are
@pxref{Hidden,,@code{.hidden}} and @pxref{Protected,,@code{.protected}}
This directive overrides the named symbols default visibility (which is set by
their binding: local, global or weak). The directive sets the visibility to
@code{internal} which means that the symbols are considered to be @code{hidden}
(ie not visible to other components), and that some extra, processor specific
processing must also be performed upon the symbols as well.
@end ifset
@node Irp
@section @code{.irp @var{symbol},@var{values}}@dots{}
@ -4323,6 +4365,41 @@ filled in with the value 0x368d (the exact placement of the bytes depends upon
the endianness of the processor). If it skips 1 or 3 bytes, the fill value is
undefined.
@ifset ELF
@node Previous
@section @code{.previous}
@cindex @code{.previous} directive
@cindex Section Stack
This is one of the ELF section stack manipulation directives. The others are
@pxref{Section}, @xref{SubSection}, @pxref{PushSection}, and
@pxref{PopSection}.
This directive swaps the current section (and subsection) with most recently
referenced section (and subsection) prior to this one. Multiple
@code{.previous} directives in a row will flip between two sections (and their
subsections).
In terms of the section stack, this directive swaps the current section with
the top section on the section stack.
@end ifset
@ifset ELF
@node PopSection
@section @code{.popsection}
@cindex @code{.popsection} directive
@cindex Section Stack
This is one of the ELF section stack manipulation directives. The others are
@pxref{Section}, @xref{SubSection}, @pxref{PushSection}, and
@pxref{Previous}.
This directive replaces the current section (and subsection) with the top
section (and subsection) on the section stack. This section is popped off the
stack.
@end ifset
@node Print
@section @code{.print @var{string}}
@ -4330,6 +4407,23 @@ undefined.
@code{@value{AS}} will print @var{string} on the standard output during
assembly. You must put @var{string} in double quotes.
@ifset ELF
@node Protected
@section @code{.protected @var{names}}
@cindex @code{.protected} directive
@cindex Visibility
This one of the ELF visibility directives. The other two are
@pxref{Hidden} and @pxref{Internal}
This directive overrides the named symbols default visibility (which is set by
their binding: local, global or weak). The directive sets the visibility to
@code{protected} which means that any references to the symbols from within the
components that defines them must be resolved to the definition in that
component, even if a definition in another component would normally preempt
this.
@end ifset
@node Psize
@section @code{.psize @var{lines} , @var{columns}}
@ -4357,6 +4451,22 @@ those explicitly specified with @code{.eject}.
Undefine the macro @var{name}, so that later uses of the string will not be
expanded. @xref{Macro}.
@ifset ELF
@node PushSection
@section @code{.pushsection @var{name} , @var{subsection}}
@cindex @code{.pushsection} directive
@cindex Section Stack
This is one of the ELF section stack manipulation directives. The others are
@pxref{Section}, @xref{SubSection}, @pxref{PopSection}, and
@pxref{Previous}.
This directive is a synonym for @code{.section}. It psuhes the current section
(and subsection) onto the top of the section stack, and then replaces the
current section and subsection with @code{name} and @code{subsection}.
@end ifset
@node Quad
@section @code{.quad @var{bignums}}
@ -4434,7 +4544,7 @@ accepts this directive but ignores it.
@end ifset
@node Section
@section @code{.section @var{name}}
@section @code{.section @var{name}} (COFF version)
@cindex @code{section} directive
@cindex named section
@ -4445,9 +4555,9 @@ This directive is only supported for targets that actually support arbitrarily
named sections; on @code{a.out} targets, for example, it is not accepted, even
with a standard @code{a.out} section name.
@ifset COFF
For COFF targets, the @code{.section} directive is used in one of the following
ways:
@smallexample
.section @var{name}[, "@var{flags}"]
.section @var{name}[, @var{subsegment}]
@ -4478,13 +4588,25 @@ loaded and writable.
If the optional argument to the @code{.section} directive is not quoted, it is
taken as a subsegment number (@pxref{Sub-Sections}).
@section @code{.section @var{name}} (ELF version)
@cindex @code{section} directive
@cindex named section
@ifset ELF
@cindex Section Stack
This is one of the ELF section stack manipulation directives. The others are
@xref{SubSection}, @pxref{PushSection}@pxref{PopSection}, and
@pxref{Previous}.
@end ifset
@ifset ELF
For ELF targets, the @code{.section} directive is used like this:
@smallexample
.section @var{name}[, "@var{flags}"[, @@@var{type}]]
.section @var{name} [, "@var{flags}"[, @@@var{type}]]
@end smallexample
The optional @var{flags} argument is a quoted string which may contain any
combintion of the following characters:
@table @code
@ -4511,9 +4633,11 @@ executable. The section will contain data.
For ELF targets, the assembler supports another type of @code{.section}
directive for compatibility with the Solaris assembler:
@smallexample
.section "@var{name}"[, @var{flags}...]
@end smallexample
Note that the section name is quoted. There may be a sequence of comma
separated flags:
@table @code
@ -4524,7 +4648,11 @@ section is writable
@item #execinstr
section is executable
@end table
@end ifset
This directive replaces the current section and subsection. The replaced
section and subsection are pushed onto the section stack. See the contents of
the gas testsuite directory @code{gas/testsuite/gas/elf} for some examples of
how this directive and the other section stack directives work.
@node Set
@section @code{.set @var{symbol}, @var{expression}}
@ -4585,21 +4713,27 @@ numbers in @sc{ieee} format.
@end ifset
@end ifclear
@ifset COFF
@node Size
@section @code{.size}
@section @code{.size} (COFF version)
@cindex @code{size} directive
This directive is generated by compilers to include auxiliary debugging
information in the symbol table. It is only permitted inside
@code{.def}/@code{.endef} pairs.
@ifset BOUT
@ifset BOUT
@samp{.size} is only meaningful when generating COFF format output; when
@code{@value{AS}} is generating @code{b.out}, it accepts this directive but
ignores it.
@end ifset
@end ifset
@section @code{.size @var{name} , @var{expression}} (ELF version)
@cindex @code{size} directive
This directive is used to set the size associated with a symbol @var{name}.
The size in bytes is computed from @var{expression} which can make use of label
arithmetic. This directive is typically used to set the size of function
symbols.
@node Sleb128
@section @code{.sleb128 @var{expressions}}
@ -4753,6 +4887,24 @@ value 8. Assembly would be left in the absolute section, and you would need to
use a @code{.section} directive of some sort to change to some other section
before further assembly.
@ifset ELF
@node SubSection
@section @code{.subsection @var{name}}
@cindex @code{.subsection} directive
@cindex Section Stack
This is one of the ELF section stack manipulation directives. The others are
@pxref{Section}, @xref{PushSection}, @pxref{PopSection}, and
@pxref{Previous}.
This directive replaces the current subsection with @code{name}. The current
section is not changed. The replaced subsection is put onto the section stack
in place of the then current top of stack subsection.
@end ifset
@ifset ELF
@node Symver
@section @code{.symver}
@ -4825,22 +4977,55 @@ source file name and pagenumber) when generating assembly listings.
This directive affects subsequent pages, as well as the current page if
it appears within ten lines of the top of a page.
@ifset COFF
@node Type
@section @code{.type @var{int}}
@section @code{.type @var{int}} (COFF version)
@cindex COFF symbol type
@cindex symbol type, COFF
@cindex @code{type} directive
This directive, permitted only within @code{.def}/@code{.endef} pairs,
records the integer @var{int} as the type attribute of a symbol table entry.
@ifset BOUT
@ifset BOUT
@samp{.type} is associated only with COFF format output; when
@code{@value{AS}} is configured for @code{b.out} output, it accepts this
directive but ignores it.
@end ifset
@end ifset
@section @code{.type @var{name} , @var{type description}} (ELF version)
@cindex ELF symbol type
@cindex symbol type, ELF
@cindex @code{type} directive
This directive is used to set the type of symbol @var{name} to be either a
function symbol or an ojbect symbol. There are five different syntaxes
supported for the @var{type description} field, in order to provide
comptability with various other assemblers. The syntaxes supported are:
@smallexample
.type <name>,#function
.type <name>,#object
.type <name>,@@function
.type <name>,@@object
.type <name>,%function
.type <name>,%object
.type <name>,"function"
.type <name>,"object"
.type <name> STT_FUNCTION
.type <name> STT_OBJECT
@end smallexample
@node Uleb128
@section @code{.uleb128 @var{expressions}}
@cindex @code{uleb128} directive
@var{uleb128} stands for ``unsigned little endian base 128.'' This is a
compact, variable length representation of numbers used by the DWARF
symbolic debugging format. @xref{Sleb128,@code{.sleb128}}.
@ifset COFF
@node Val
@ -4859,46 +5044,40 @@ configured for @code{b.out}, it accepts this directive but ignores it.
@end ifset
@end ifset
@node Uleb128
@section @code{.uleb128 @var{expressions}}
@ifset ELF
@node Version
@section @code{.version "@var{string}"}
@cindex @code{uleb128} directive
@var{uleb128} stands for ``unsigned little endian base 128.'' This is a
compact, variable length representation of numbers used by the DWARF
symbolic debugging format. @xref{Sleb128,@code{.sleb128}}.
@cindex @code{.version}
This directive creates a @code{.note} section and places into it an ELF
formatted note of type NT_VERSION. The note's name is set to @code{string}.
@end ifset
@ifset ELF
@node Visibility
@section @code{.internal}, @code{.hidden}, @code{.protected}
@cindex @code{internal} directive
@cindex @code{hidden} directive
@cindex @code{protected} directive
@cindex symbol visibility
@node VTableEntry
@section @code{.vtable_entry @var{table}, @var{offset}}
These directives can be used to set the visibility of a specified symbol. By
default a symbol's visibility is set by its binding (local, global or weak),
but these directives can be used to override that.
@cindex @code{.vtable_entry}
This directive finds or creates a symbol @code{table} and creates a
@code{VTABLE_ENTRY} relocation for it with an addend of @code{offset}.
A visibility of @code{protected} means that any references to the symbol from
within the component that defines the symbol must be resolved to the definition
in that component, even if a definition in another component would normally
preempt this.
@node VTableInherit
@section @code{.vtable_inherit @var{child}, @var{parent}}
A visibility of @code{hidden} means that the symbol is not visible to other
components. Such a symbol is always considered to be protected as well.
@cindex @code{.vtable_inherit}
This directive finds the symbol @code{child} and finds or creates the symbol
@code{parent} and then creates a @code{VTABLE_INHERIT} relocation for the
parent whoes addend is the value of the child symbol. As a special case the
parent name of @code{0} is treated as refering the @code{*ABS*} section.
@end ifset
A visibility of @code{internal} is the same as a visibility of @code{hidden},
except that some extra, processor specific processing must also be performed
upon the symbol.
For ELF targets, the directives are used like this:
@smallexample
.internal @var{name}
.hidden @var{name}
.protected @var{name}
@end smallexample
@ifset ELF
@node Weak
@section @code{.weak @var{names}}
@cindex @code{.weak}
This directive sets the weak attribute on the comma seperated list of symbol
@code{names}. If the symbols do not already exist, they will be created.
@end ifset
@node Word