2021-11-14 00:33:40 -05:00
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; You can use registers like variables: rax = A, rbx = B, rcx = C, rdx = D, rsi = I, rdi = J, rsp = S, rbp = R
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; However, because of the way things are implemented, you should be careful about using A/B as variables:
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; they sometimes might not work correctly, and will be overwritten by a lot of statements
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; set register to...
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; decimal
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D=d123
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; hexadecimal
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D=x1ef
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; another register
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D=R we can have a comment here and in some other places. not after numbers or labels though.
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; label address
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D=:label
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; add
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2021-11-13 15:02:23 -05:00
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D+=d4
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2021-11-14 00:33:40 -05:00
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D+=R
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; subtract
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D-=d123
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D-=R
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; left/right shift (only rcx is supported for variable shifts)
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D<=C
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D<=d33
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D>=C
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D>=x12
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; arithmetic right shift
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2021-11-13 13:48:27 -05:00
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D]=d7
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D]=C
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2021-11-14 00:33:40 -05:00
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; bitwise xor, or, and
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D^=R
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D|=R
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D&=R
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D^=d1
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D|=d1
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D&=d1
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; bitwise not
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; (this sets D to ~D)
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~D
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; dereference
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; set 8 bytes at rdx to rbp
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8D=R
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; set 4 bytes at rdx to ebp
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4D=R
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2D=R
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1D=R
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; set rcx/ecx/cx/cl to 8/4/2/1 bytes at rdx
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C=8D
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C=4D
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C=2D
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C=1D
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; call a function
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call :function
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; return
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return
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; label declarations
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;:function
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;:label
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; literal byte
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2021-11-13 13:48:27 -05:00
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x4b
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2021-11-14 00:33:40 -05:00
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'H
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'i
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; string
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str This text will appear in the executable!
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; unconditional jump
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2021-11-13 13:48:27 -05:00
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!:label
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2021-11-14 00:33:40 -05:00
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; conditional jump
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?R<S:label
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?R=S:label
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?R!S:label
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?R>S:label
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; (unsigned comparisons above/below)
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?RaS:label
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?RbS:label
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; syscall
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2021-11-13 13:48:27 -05:00
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syscall x3c
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2021-11-14 00:33:40 -05:00
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; align to 8 bytes
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2021-11-13 14:13:16 -05:00
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align
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2021-11-14 00:33:40 -05:00
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; reserve some number of bytes of memory
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2021-11-13 14:13:16 -05:00
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reserve d1000
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2021-11-14 00:33:40 -05:00
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; signed/unsigned multiply/divide
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2021-11-13 14:32:00 -05:00
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imul
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idiv
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mul
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div
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2021-11-14 00:33:40 -05:00
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; e.g. to compute 5*3 into rcx (note rdx is wiped in the process):
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A=d5
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B=d3
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mul
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