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finished 01, now just need to write readme

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pommicket 2021-09-01 14:58:37 -04:00
parent 6efb86d66d
commit bd739d7205
6 changed files with 283 additions and 210 deletions
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15
00/README.md
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@ -25,7 +25,7 @@ it even smaller if you wanted to. Let's take a look at what's inside (`od -t x1
00 10 00 00 00 00 00 00 48 b8 6d 02 40 00 00 00
00 00 48 89 c7 31 c0 48 89 c6 48 b8 02 00 00 00
00 00 00 00 0f 05 48 b8 72 02 40 00 00 00 00 00
48 89 c7 48 b8 41 00 00 00 00 00 00 00 48 89 c6
48 89 c7 48 b8 41 02 00 00 00 00 00 00 48 89 c6
48 b8 ed 01 00 00 00 00 00 00 48 89 c2 48 b8 02
00 00 00 00 00 00 00 0f 05 48 b8 03 00 00 00 00
00 00 00 48 89 c7 48 89 c2 48 b8 6a 02 40 00 00
@ -179,18 +179,19 @@ Now we open our output file:
- `48 b8 72 02 40 00 00 00 00 00` `mov rax, 0x400272`
- `48 89 c7` `mov rdi, rax`
- `48 b8 41 00 00 00 00 00 00 00` `mov rax, 0x41`
- `48 b8 41 02 00 00 00 00 00 00` `mov rax, 0x41`
- `48 89 c6` `mov rsi, rax`
- `48 b8 ed 01 00 00 00 00 00 00` `mov rax, 0o755`
- `48 89 c2` `mov rdx, rax`
- `48 b8 02 00 00 00 00 00 00 00` `mov rax, 2`
- `0f 05` `syscall`
In C, this is `open("out00", O_WRONLY|O_CREAT, 0755)`. This is quite similar
to our first call, with two important differences: first, we specify `0x41` as
the second argument. This tells Linux that we are writing to the file
(`O_WRONLY = 0x01`), and that we want to create it if it doesn't exist
(`O_CREAT = 0x40`). Secondly, we are setting the third argument this time. It
In C, this is `open("out00", O_WRONLY|O_CREAT|O_TRUNC, 0755)`. This is quite
similar to our first call, with two important differences: first, we specify
`0x241` as the second argument. This tells Linux that we are writing to the
file (`O_WRONLY = 0x01`), that we want to create it if it doesn't exist
(`O_CREAT = 0x40`), and that we want to delete any previous contents it had
(`O_TRUNC = 0x200`). Secondly, we are setting the third argument this time. It
specifies the permissions our file is created with (`0o755` means user
read/write/execute, group/other read/execute). This is not very important to
the actual execution of the program, so don't worry if you don't know what it

BIN
00/hexcompile
View file

Binary file not shown.

390
01/in00
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@ -36,7 +36,7 @@ a8 00 40 00 00 00 00 00
0f 05
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48 89 c7
48 b8 41 00 00 00 00 00 00 00
48 b8 41 02 00 00 00 00 00 00
48 89 c6
48 b8 ed 01 00 00 00 00 00 00
48 89 c2
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@ -8016,11 +8016,13 @@ cc cc cc cc cc cc cc cc
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@ -13934,13 +13934,20 @@ cc cc cc cc cc cc cc cc
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00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
02 0f 8c 00 00 00 00 00
01 e9 00 00 00 00 00 00
02 0f 85 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
@ -14184,7 +14191,9 @@ cc cc cc cc cc cc cc cc
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
02 8a 03 00 00 00 00 00
00 00 00 00 00 00 00 00
02 8b 03 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
@ -14197,11 +14206,13 @@ cc cc cc cc cc cc cc cc
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
03 48 8b 03 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
03 66 8b 03 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
@ -14403,6 +14414,7 @@ cc cc cc cc cc cc cc cc
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
03 48 f7 d8 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
@ -14950,6 +14962,7 @@ cc cc cc cc cc cc cc cc
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
01 c3 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
@ -15074,7 +15087,9 @@ cc cc cc cc cc cc cc cc
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
02 88 03 00 00 00 00 00
00 00 00 00 00 00 00 00
02 89 03 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
@ -15087,28 +15102,13 @@ cc cc cc cc cc cc cc cc
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
03 48 89 03 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
03 66 89 03 00 00 00 00
00 00 00 00 00 00 00 00
02 0f 05 00 00 00 00 00
00 00 00 00 00 00 00 00
@ -15218,6 +15218,7 @@ cc cc cc cc cc cc cc cc
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
03 48 85 c0 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
@ -15727,8 +15728,7 @@ cc cc cc cc cc cc cc cc
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
02 48 93 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
@ -16207,7 +16207,7 @@ cc cc cc cc cc cc cc cc
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
03 48 09 d8 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00

13
01/in01
View file

@ -1,6 +1,15 @@
||
;im;2a;00;00;00;00;00;00;00
;im;01;00;00;00;00;00;00;00 file descriptor for stdout
;JA
;im;3c;00;00;00;00;00;00;00
;im;bc;00;40;00;00;00;00;00 address of string "Hello, world!\n"
;IA
;im;0e;00;00;00;00;00;00;00 number of bytes to output
;DA
;im;01;00;00;00;00;00;00;00 syscall #1 (write)
;sy
;zA
;DA exit code 0
;im;3c;00;00;00;00;00;00;00 syscall #60 (exit)
;sy
;'H;'e;'l;'l;'o;',;' ;'w;'o;'r;'l;'d;'!;\n the string we're printing
;

63
01/instructions.txt Normal file
View file

@ -0,0 +1,63 @@
00 - Byte 00
..
ff - Byte ff
'a - Character a (byte 0x61)
'! - Character ! (byte 0x21)
etc.
zA - Zero rax
im - Set rax to an immediate value, e.g.
im;05;00;00;00;00;00;00;00;
will set rax to 5.
ax bx cx dx sp bp si di
A B C D S R I J
The instruction for moving one register to another is [dest][src], e.g. CS is
mov rcx, rsp.
XA - mov r8, rax
YA - mov r9, rax
ZA - mov r10, rax
xc - xchg rax, rbx
sq - mov qword [rbx], rax
lq - mov rax, qword [rbx]
sd - mov dword [rbx], eax
ld - mov eax, dword [rbx]
sw - mov word [rbx], ax
lw - mov ax, word [rbx]
sb - mov byte [rbx], al
lb - mov al, byte [rbx]
Sq - mov qword [rsp], rax
Lq - mov rax, qword [rsp]
nA - neg rax
+B - add rax, rbx
-* - imul rbx
-/ - idiv rbx
+* - mul rbx
+/ - div rbx
!A - not rax
&B - and rax, rbx
|B - or rax, rbx
^B - xor rax, rbx
<C - shl rax, cl
<I - shl rax, imm8
>C - shr rax, cl
>I - shr rax, imm8
]C - sar rax, cl
]I - sar rax, imm8
-S - sub rsp, imm32
cm - cmp rax, rbx
te - test rax, rax
jm - jmp rel32
je - je rel32
jn - jne rel32
jl - jl rel32
jb - jb rel32
ja - ja rel32
cl - call rax
re - ret
sy - syscall

12
instructions.txt
View file

@ -21,10 +21,6 @@ mov r10, rax (for syscalls)
>49 89 c2
xchg rax, rbx
>48 93
mov qword [rsp], rax
>48 89 04 24
mov rax, qword [rsp]
>48 8b 04 24
mov qword [rbx], rax
>48 89 03
mov rax, qword [rbx]
@ -41,6 +37,10 @@ mov byte [rbx], al
>88 03
mov al, byte [rbx]
>8a 03
mov qword [rsp], rax
>48 89 04 24
mov rax, qword [rsp]
>48 8b 04 24
neg rax
>48 f7 d8
add rax, rbx
@ -89,10 +89,10 @@ jl rel32
>0f 8c REL32
jg rel32
>0f 8f REL32
ja rel32
>0f 87 REL32
jb rel32
>0f 82 REL32
ja rel32
>0f 87 REL32
call rax
>ff d0
ret