Using as: Pseudo Ops

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7 Assembler Directives

All assembler directives have names that begin with a period (‘.’). The names are case insensitive for most targets, and usually written in lower case.

This chapter discusses directives that are available regardless of the target machine configuration for the GNU assembler. Some machine configurations provide additional directives. See Machine Dependencies.

• Abort:    .abort
• ABORT (COFF):    .ABORT 






• Align:
  

.align abs-expr , abs-expr






• Altmacro:
  

.altmacro





• Ascii:
  

.ascii "string"…





• Asciz:
  

.asciz "string"…





• Balign:
  

.balign abs-expr , abs-expr






• Bundle directives:
  

.bundle_align_mode abs-expr
, etc





• Byte:
  

.byte expressions






• CFI directives:
  

.cfi_startproc [simple], .cfi_endproc, etc.





• Comm:
  

.comm symbol , length 





• Data:
  

.data subsection






• Def:
  

.def name






• Desc:
  

.desc symbol, abs-expression






• Dim:
  

.dim













• Double:
  

.double flonums






• Eject:
  

.eject





• Else:
  

.else





• Elseif:
  

.elseif





• End:
  

.end





• Endef:
  

.endef













• Endfunc:
  

.endfunc





• Endif:
  

.endif





• Equ:
  

.equ symbol, expression






• Equiv:
  

.equiv symbol, expression






• Eqv:
  

.eqv symbol, expression






• Err:
  

.err





• Error:
  

.error string






• Exitm:
  

.exitm





• Extern:
  

.extern





• Fail:
  

.fail





• File:
  

.file





• Fill:
  

.fill repeat , size , value






• Float:
  

.float flonums






• Func:
  

.func





• Global:
  

.global symbol
, .globl symbol






• Gnu_attribute:
  

.gnu_attribute tag,value






• Hidden:
  

.hidden names














• hword:
  

.hword expressions






• Ident:
  

.ident





• If:
  

.if absolute expression






• Incbin:
  

.incbin "file"[,skip[,count]]





• Include:
  

.include "file"





• Int:
  

.int expressions






• Internal:
  

.internal names














• Irp:
  

.irp symbol,values
…





• Irpc:
  

.irpc symbol,values
…





• Lcomm:
  

.lcomm symbol , length






• Lflags:
  

.lflags





• Line:
  

.line line-number














• Linkonce:
  

.linkonce [type]





• List:
  

.list





• Ln:
  

.ln line-number






• Loc:
  

.loc fileno lineno






• Loc_mark_labels:
  

.loc_mark_labels enable






• Local:
  

.local names














• Long:
  

.long expressions














• Macro:
  

.macro name args
…





• MRI:
  

.mri val






• Noaltmacro:
  

.noaltmacro





• Nolist:
  

.nolist





• Octa:
  

.octa bignums






• Offset:
  

.offset loc






• Org:
  

.org new-lc, fill






• P2align:
  

.p2align abs-expr, abs-expr, abs-expr






• PopSection:
  

.popsection





• Previous:
  

.previous













• Print:
  

.print string






• Protected:
  

.protected names














• Psize:
  

.psize lines, columns






• Purgem:
  

.purgem name






• PushSection:
  

.pushsection name














• Quad:
  

.quad bignums






• Reloc:
  

.reloc offset, reloc_name[, expression]





• Rept:
  

.rept count






• Sbttl:
  

.sbttl "subheading"





• Scl:
  

.scl class






• Section:
  

.section name[, flags]













• Set:
  

.set symbol, expression






• Short:
  

.short expressions






• Single:
  

.single flonums






• Size:
  

.size [name , expression]





• Skip:
  

.skip size , fill














• Sleb128:
  

.sleb128 expressions






• Space:
  

.space size , fill






• Stab:
  

.stabd, .stabn, .stabs













• String:
  

.string "str", .string8 "str", .string16 "str", .string32 "str", .string64 "str"





• Struct:
  

.struct expression






• SubSection:
  

.subsection





• Symver:
  

.symver name,name2@nodename














• Tag:
  

.tag structname














• Text:
  

.text subsection






• Title:
  

.title "heading"





• Type:
  

.type <int | name , type description>













• Uleb128:
  

.uleb128 expressions






• Val:
  

.val addr














• Version:
  

.version "string"





• VTableEntry:
  

.vtable_entry table, offset






• VTableInherit:
  

.vtable_inherit child, parent














• Warning:
  

.warning string






• Weak:
  

.weak names






• Weakref:
  

.weakref alias, symbol






• Word:
  

.word expressions






• Zero:
  

.zero size






• 2byte:
  

.2byte expressions






• 4byte:
  

.4byte expressions






• 8byte:
  

.8byte bignums






• Deprecated:
  
Deprecated Directives











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