as.info: M68K-Syntax

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Syntax

   This syntax for the Motorola 680x0 was developed at MIT.
   The 680x0 version of `as' uses instructions names and syntax
compatible with the Sun assembler.  Intervening periods are ignored;
for example, `movl' is equivalent to `mov.l'.
   In the following table APC stands for any of the address registers
(`%a0' through `%a7'), the program counter (`%pc'), the zero-address
relative to the program counter (`%zpc'), a suppressed address register
(`%za0' through `%za7'), or it may be omitted entirely.  The use of
SIZE means one of `w' or `l', and it may be omitted, along with the
leading colon, unless a scale is also specified.  The use of SCALE
means one of `1', `2', `4', or `8', and it may always be omitted along
with the leading colon.
   The following addressing modes are understood:
"Immediate"
     `#NUMBER'
"Data Register"
     `%d0' through `%d7'
"Address Register"
     `%a0' through `%a7'
     `%a7' is also known as `%sp', i.e. the Stack Pointer.  `%a6' is
     also known as `%fp', the Frame Pointer.
"Address Register Indirect"
     `%a0@' through `%a7@'
"Address Register Postincrement"
     `%a0@+' through `%a7@+'
"Address Register Predecrement"
     `%a0@-' through `%a7@-'
"Indirect Plus Offset"
     `APC@(NUMBER)'
"Index"
     `APC@(NUMBER,REGISTER:SIZE:SCALE)'
     The NUMBER may be omitted.
"Postindex"
     `APC@(NUMBER)@(ONUMBER,REGISTER:SIZE:SCALE)'
     The ONUMBER or the REGISTER, but not both, may be omitted.
"Preindex"
     `APC@(NUMBER,REGISTER:SIZE:SCALE)@(ONUMBER)'
     The NUMBER may be omitted.  Omitting the REGISTER produces the
     Postindex addressing mode.
"Absolute"
     `SYMBOL', or `DIGITS', optionally followed by `:b', `:w', or `:l'.