37 lines
1.1 KiB
Plaintext
37 lines
1.1 KiB
Plaintext
Basics of the Unix assembler syntax
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Lines starting with " are comment lines
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. is the location counter, where the next code or constant will be placed
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.. is the relocation counter
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t = 0 No idea on this yet
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orig: is a label. It looks like labels can have dots in them.
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Dots seem to separate structures and fields, e.g. u.base
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but there are some symbols that start with dots, e.g. .seek
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jms copy; 10; u.rg+2; 6 Semicolons separate instructions and
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word expressions that follow the instruction
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Some expressions are 0:0, not sure about this
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jmp 1f Jump back to the closest 1: label
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jmp 1b Jump forward to the closest 1: label
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I'm not sure why some lines are indented differently to others e.g.
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jms betwen; o10000; o17762
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jms error
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dac .+1
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-1 occurs instead of instructions, so it looks like the assembler allows
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literal constants at any time.
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String literals seem to be two characters decorated with < > characters, e.g.
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"ab" is <a>b. I'm guessing these are placed as pairs in one word.
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Looks like a line can contain multiple labels, e.g. o12: d10: 10
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Numeric literals: 0xx are octal values, [1-9]xx are decimal values.
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