as: M68K-Syntax
9.21.2 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'.
Info Catalog
as: M68K-Opts
as: M68K-Dependent
as: M68K-Moto-Syntax