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Opcodes currently supported by SubX:
01: add r32 to rm32
03: add rm32 to r32
05: add imm32 to R0 (EAX)
09: rm32 = bitwise OR of r32 with rm32
0b: r32 = bitwise OR of r32 with rm32
0d: R0 = bitwise OR of imm32 with R0 (EAX)
21: rm32 = bitwise AND of r32 with rm32
23: r32 = bitwise AND of r32 with rm32
25: R0 = bitwise AND of imm32 with R0 (EAX)
29: subtract r32 from rm32
2b: subtract rm32 from r32
2d: subtract imm32 from R0 (EAX)
31: rm32 = bitwise XOR of r32 with rm32
33: r32 = bitwise XOR of r32 with rm32
35: R0 = bitwise XOR of imm32 with R0 (EAX)
39: compare: set SF if rm32 < r32
3b: compare: set SF if r32 < rm32
3d: compare: set SF if R0 < imm32
50: push R0 (EAX) to stack
51: push R1 (ECX) to stack
52: push R2 (EDX) to stack
53: push R3 (EBX) to stack
54: push R4 (ESP) to stack
55: push R5 (EBP) to stack
56: push R6 (ESI) to stack
57: push R7 (EDI) to stack
58: pop top of stack to R0 (EAX)
59: pop top of stack to R1 (ECX)
5a: pop top of stack to R2 (EDX)
5b: pop top of stack to R3 (EBX)
5c: pop top of stack to R4 (ESP)
5d: pop top of stack to R5 (EBP)
5e: pop top of stack to R6 (ESI)
5f: pop top of stack to R7 (EDI)
68: push imm32 to stack
74: jump disp8 bytes away if ZF is set
75: jump disp8 bytes away if ZF is not set
7c: jump disp8 bytes away if lesser (SF != OF)
7d: jump disp8 bytes away if greater or equal (SF == OF)
7e: jump disp8 bytes away if lesser or equal (ZF is set or SF != OF)
7f: jump disp8 bytes away if greater (ZF is unset, SF == OF)
81: combine rm32 with imm32 based on subop
87: swap the contents of r32 and rm32
88: copy r8 (lowermost byte of r32) to r8/m8-at-r32
89: copy r32 to rm32
8a: copy r8/m8-at-r32 to r8 (lowermost byte of r32)
8b: copy rm32 to r32
8f: pop top of stack to rm32
b8: copy imm32 to R0 (EAX)
b9: copy imm32 to R1 (ECX)
ba: copy imm32 to R2 (EDX)
bb: copy imm32 to R3 (EBX)
bc: copy imm32 to R4 (ESP)
bd: copy imm32 to R5 (EBP)
be: copy imm32 to R6 (ESI)
bf: copy imm32 to R7 (EDI)
c3: return from most recent unfinished call
c7: copy imm32 to rm32
cd: software interrupt
e8: call disp32
e9: jump disp16 bytes away
eb: jump disp8 bytes away
f4: halt
f7: bitwise complement of rm32
ff: jump/push/call rm32 based on subop
0f 84: jump disp16 bytes away if ZF is set
0f 85: jump disp16 bytes away if ZF is not set
0f 8c: jump disp16 bytes away if lesser (SF != OF)
0f 8d: jump disp16 bytes away if greater or equal (SF == OF)
0f 8e: jump disp16 bytes away if lesser or equal (ZF is set or SF != OF)
0f 8f: jump disp16 bytes away if greater (ZF is unset, SF == OF)
0f af: multiply rm32 into r32
Run `subx help instructions` for details on words like 'r32' and 'disp8'.
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