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Diffstat (limited to 'programs/sub-suite/subasm-syntax')
| -rw-r--r-- | programs/sub-suite/subasm-syntax | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/programs/sub-suite/subasm-syntax b/programs/sub-suite/subasm-syntax new file mode 100644 index 0000000..1337914 --- /dev/null +++ b/programs/sub-suite/subasm-syntax @@ -0,0 +1,56 @@ +/* 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) { + [)] + \} + \)> |