diff options
| -rw-r--r-- | gas/ChangeLog | 6 | ||||
| -rw-r--r-- | gas/doc/as.texinfo | 307 |
2 files changed, 249 insertions, 64 deletions
diff --git a/gas/ChangeLog b/gas/ChangeLog index f49d7c4..17efdce 100644 --- a/gas/ChangeLog +++ b/gas/ChangeLog @@ -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. diff --git a/gas/doc/as.texinfo b/gas/doc/as.texinfo index 8ff7577..9c39291 100644 --- a/gas/doc/as.texinfo +++ b/gas/doc/as.texinfo @@ -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}). -@end ifset + +@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 + 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}} - -@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 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 Version +@section @code{.version "@var{string}"} -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{.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 -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. +@ifset ELF +@node VTableEntry +@section @code{.vtable_entry @var{table}, @var{offset}} -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_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{internal} is the same as a visibility of @code{hidden}, -except that some extra, processor specific processing must also be performed -upon the symbol. +@node VTableInherit +@section @code{.vtable_inherit @var{child}, @var{parent}} -For ELF targets, the directives are used like this: +@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 -@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 |