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/* Assembly language syntax for SuBAsm. */
/* Comments begin with "/*", and end with "*/".
* Directives begin with a `\`.
*/
/* mnemonic is the instruction name/mnemonic.
* expr is an expression.
* Indirect Indexed means applying the index after the indirection.
* Indexed Indirect means applying the index before the indirection.
*/
Expression syntax:
/* TODO */
Instruction syntax:
Base ISA, and Base Extension:
Implied:
<mnemonic>
B register:
<mnemonic> b
Absolute/Zero Matrix:
/* [, <x|y>] means Indexed with x, or y. */
<mnemonic> <expr>[, <x|y>]
Immediate Data:
<mnemonic> #<expr>
Absolute/Zero Matrix Indirect:
/* Indexing with x means Indexed Indirect.
* Indexing with y means Indirect Indexed.
*/
<mnemonic> (<expr>[, x])[, y]
E Indirect:
<mnemonic> (e)
Orthogonal Extension:
<mnemonic> <operand>[, operand]
Operand syntax:
<\(
/* The operand starts with a register.
* If the statment is inside brackets, then
* it's a register indirect mode.
*/
[(]reg[+<reg>][\(+|-\)<expr>][)]
/* The operand starts with an expression.
* If the statment is inside brackets, then
* it's an indirect mode.
*/
|[(]expr
/* Is the operand using Indirect, or Indirect Indexed? */
\if (ind || ind_indexed) {
[)]
\}
[\(+|-\)<reg[+<reg>]>]
/* Is the operand using Indexed Indirect? */
\if (indexed_ind) {
[)]
\}
\)>
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