| Getting Started with M68K Ada: Ada 95 Compilation System for the Motorola M68000 Family | ||
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This syntax for the Motorola M68000 family was developed at the Massachusetts Institute of Technology (MIT).
The Assembler 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:
#number
%d0 through %d7
%a0 through %a7@* %a7 is also known as %sp, i.e. the Stack Pointer. %a6 is also known as %fp, the Frame Pointer.
%a0@ through %a7@
%a0@+ through %a7@+
%a0@- through %a7@-
apc@(number)
apc@(number,register:size:scale)
The number may be omitted.
apc@(number)@(onumber,register:size:scale)
The onumber or the register, but not both, may be omitted.
apc@(number,register:size:scale)@(onumber)
The number may be omitted. Omitting the register produces the postindex addressing mode.
symbol, or digits, optionally followed by :b, :w, or :l.