Supported Extensions

Some GNU extensions are always available, regardless whether you enable GNU compatible syntax . Specifically:

• Lines beginning with # * or ; are always treated as comment, even if the comment symbol for that assembler is someting different.
• Escape characters in strings extended to include \xNN for hex digits and \NNN for octal.
• Binary constants may begin with 0b.
• Supports the GNU macro language, with macros defined by:

         .macro     name,arg1[=default1],arg2...s1 
         ... 
         .endm
  
    

  Arguments may have default values as shown, and when called may be specified by value or position. See the GNU documentation for details.

• New or enhanced directives (see GNU documentation for details)

  Table 1. Supported GNU Assembler Directives

  Directive	Description	Comment
  .abort	End assembly	Supported
  .align N,[pad]	Align	Now accepts optional padding byte
  .app-file name	Source name	Synonym for .file
  .balign[wl] N,[pad]	Align	Align to N (with optional padding value)
  .comm name,length	Common data	Reserve space in BSS for global symbol
  .def	Debugging	Accepted but ignored
  .desc	Debugging	Accepted but ignored
  .dim	Debugging	Accepted but ignored
  .eject	Eject page	Accepted but ignored
  .endr	End repeat	See .irp, .irpc
  .endef	Debugging	Accepted but ignored
  .fill N,[size],[val]	Repeat data	Emit N copies of width 'size', value 'val'
  .hword val..	Half-word	Synonym for .short
  .ident	Tags	Accepted but ignored
  .ifnotdef name	Conditional	Synonym for .ifndef
  .include name	Include file	Now accepts single, double or no quotes
  .int val..	Word	Synonm for .long
  .irp name,values	Repeat	Repeat up to .endr substituting values for name
  .irpc name,chars	Repeat	Repeat up to .endr substituting chars for name
  .lcomm name,length	Local common	Reserve length bytes in bss
  .lflags	Ignored	Accepted but ignored
  .ln lineno	Line number	Synonym for .line
  .list	Listing on	Switch on listing
  .local name	Local macro var	Declare name as local to macro
  .macro name, args..	Macros	Supports Gnu syntax, default values, etc
  .nolist	Listing off	Disable listing
  .org pos,fill	Origin	Now allows fill value ot be specified
  .p2align[wl] N[,pad]	Align	Align to 2**N, using pad value 'pad'
  .psize	Page size	Accepted but ignored
  .rept N	Repeat	Repeat block up to .endr N times
  .sbttl	Subtitle	Accepted but ignored
  .scl	Debugging	Accepted but ignored
  .size name,N	Set size	Set size of name to N
  .skip N[,pad]	Space	Skip N bytes, pad with 'pad'
  .space N[,pad]	Space	Skip N bytes, pad with 'pad'
  .stabd	Debugging	Accepted but ignored
  .stabn	Debugging	Accepted but ignored
  .stabs	Debugging	Accepted but ignored
  .str "string"	Constant string	Synonym for .asciz
  .string "string"	Constant string	Synonym for .asciz
  .tag	Debugging	Accepted but ignored
  .title	Title	Accepted but ignored
  .type	Debugging	Ignored in Gnu mode
  .val	Debugging	Accepted but ignored
  .word	Word	Synonym for .long