diff options
Diffstat (limited to '03/ex03')
| -rw-r--r-- | 03/ex03 | 105 |
1 files changed, 75 insertions, 30 deletions
@@ -1,42 +1,87 @@ +; You can use registers like variables: rax = A, rbx = B, rcx = C, rdx = D, rsi = I, rdi = J, rsp = S, rbp = R +; However, because of the way things are implemented, you should be careful about using A/B as variables: +; they sometimes might not work correctly, and will be overwritten by a lot of statements + +; set register to... +; decimal +D=d123 +; hexadecimal +D=x1ef +; another register +D=R we can have a comment here and in some other places. not after numbers or labels though. +; label address +D=:label +; add D+=d4 +D+=R +; subtract +D-=d123 +D-=R +; left/right shift (only rcx is supported for variable shifts) +D<=C +D<=d33 +D>=C +D>=x12 +; arithmetic right shift D]=d7 D]=C -D^=C -D|=C -D&=C -~C -B|=A -8D=C -A=1B -B>=d33 -call :funciton +; bitwise xor, or, and +D^=R +D|=R +D&=R +D^=d1 +D|=d1 +D&=d1 +; bitwise not +; (this sets D to ~D) +~D +; dereference +; set 8 bytes at rdx to rbp +8D=R +; set 4 bytes at rdx to ebp +4D=R +2D=R +1D=R +; set rcx/ecx/cx/cl to 8/4/2/1 bytes at rdx +C=8D +C=4D +C=2D +C=1D +; call a function +call :function +; return +return +; label declarations +;:function +;:label +; literal byte x4b +'H +'i +; string +str This text will appear in the executable! +; unconditional jump !:label -?J<B:label -:label -1B=C -; :l ba b -J=d0 -A=d60 +; conditional jump +?R<S:label +?R=S:label +?R!S:label +?R>S:label +; (unsigned comparisons above/below) +?RaS:label +?RbS:label +; syscall syscall x3c +; align to 8 bytes align -:label +; reserve some number of bytes of memory reserve d1000 -B+=J -B<=d9 -B-=J -?J=B:label -?A!B:label -?A>B:label -A=:label -x3c -return +; signed/unsigned multiply/divide imul idiv mul div -:funciton -call A -str Here is some text which will be put in the executable! -?CaD:label - +; e.g. to compute 5*3 into rcx (note rdx is wiped in the process): +A=d5 +B=d3 +mul |