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:
%a6is also known as `%fp', the Frame Pointer.
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