diff options
Diffstat (limited to 'subx_opcodes')
| -rw-r--r-- | subx_opcodes | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/subx_opcodes b/subx_opcodes new file mode 100644 index 00000000..e222df66 --- /dev/null +++ b/subx_opcodes @@ -0,0 +1,106 @@ +Opcodes currently supported by SubX: + 01: add r32 to rm32 (add) + 03: add rm32 to r32 (add) + 05: add imm32 to EAX (add) + 09: rm32 = bitwise OR of r32 with rm32 (or) + 0b: r32 = bitwise OR of r32 with rm32 (or) + 0d: EAX = bitwise OR of imm32 with EAX (or) + 21: rm32 = bitwise AND of r32 with rm32 (and) + 23: r32 = bitwise AND of r32 with rm32 (and) + 25: EAX = bitwise AND of imm32 with EAX (and) + 29: subtract r32 from rm32 (sub) + 2b: subtract rm32 from r32 (sub) + 2d: subtract imm32 from EAX (sub) + 31: rm32 = bitwise XOR of r32 with rm32 (xor) + 33: r32 = bitwise XOR of r32 with rm32 (xor) + 35: EAX = bitwise XOR of imm32 with EAX (xor) + 39: compare: set SF if rm32 < r32 (cmp) + 3b: compare: set SF if r32 < rm32 (cmp) + 3d: compare: set SF if EAX < imm32 (cmp) + 40: increment EAX (inc) + 41: increment ECX (inc) + 42: increment EDX (inc) + 43: increment EBX (inc) + 44: increment ESP (inc) + 45: increment EBP (inc) + 46: increment ESI (inc) + 47: increment EDI (inc) + 48: decrement EAX (dec) + 49: decrement ECX (dec) + 4a: decrement EDX (dec) + 4b: decrement EBX (dec) + 4c: decrement ESP (dec) + 4d: decrement EBP (dec) + 4e: decrement ESI (dec) + 4f: decrement EDI (dec) + 50: push EAX to stack (push) + 51: push ECX to stack (push) + 52: push EDX to stack (push) + 53: push EBX to stack (push) + 54: push ESP to stack (push) + 55: push EBP to stack (push) + 56: push ESI to stack (push) + 57: push EDI to stack (push) + 58: pop top of stack to EAX (pop) + 59: pop top of stack to ECX (pop) + 5a: pop top of stack to EDX (pop) + 5b: pop top of stack to EBX (pop) + 5c: pop top of stack to ESP (pop) + 5d: pop top of stack to EBP (pop) + 5e: pop top of stack to ESI (pop) + 5f: pop top of stack to EDI (pop) + 68: push imm32 to stack (push) + 72: jump disp8 bytes away if lesser (unsigned), if CF is set (jcc/jb/jnae) + 73: jump disp8 bytes away if greater or equal (unsigned), if CF is unset (jcc/jae/jnb) + 74: jump disp8 bytes away if equal, if ZF is set (jcc/jz/je) + 75: jump disp8 bytes away if not equal, if ZF is not set (jcc/jnz/jne) + 76: jump disp8 bytes away if lesser or equal (unsigned), if ZF is set or CF is set (jcc/jbe/jna) + 77: jump disp8 bytes away if greater (unsigned), if ZF is unset and CF is unset (jcc/ja/jnbe) + 7c: jump disp8 bytes away if lesser (signed), if SF != OF (jcc/jl/jnge) + 7d: jump disp8 bytes away if greater or equal (signed), if SF == OF (jcc/jge/jnl) + 7e: jump disp8 bytes away if lesser or equal (signed), if ZF is set or SF != OF (jcc/jle/jng) + 7f: jump disp8 bytes away if greater (signed), if ZF is unset and SF == OF (jcc/jg/jnle) + 81: combine rm32 with imm32 based on subop (add/sub/and/or/xor/cmp) + 87: swap the contents of r32 and rm32 (xchg) + 88: copy r8 to r8/m8-at-r32 + 89: copy r32 to rm32 (mov) + 8a: copy r8/m8-at-r32 to r8 + 8b: copy rm32 to r32 (mov) + 8d: copy address in rm32 into r32 (lea) + 8f: pop top of stack to rm32 (pop) + 99: sign-extend EAX into EDX (cdq) + b8: copy imm32 to EAX (mov) + b9: copy imm32 to ECX (mov) + ba: copy imm32 to EDX (mov) + bb: copy imm32 to EBX (mov) + bc: copy imm32 to ESP (mov) + bd: copy imm32 to EBP (mov) + be: copy imm32 to ESI (mov) + bf: copy imm32 to EDI (mov) + c1: shift rm32 by imm8 bits depending on subop (sal/sar/shl/shr) + c3: return from most recent unfinished call (ret) + c6: copy imm8 to r8/m8-at-r32 (mov) + c7: copy imm32 to rm32 (mov) + cd: software interrupt (int) + d3: shift rm32 by CL bits depending on subop (sal/sar/shl/shr) + e8: call disp32 (call) + e9: jump disp32 bytes away (jmp) + eb: jump disp8 bytes away (jmp) + f4: halt (hlt) + f7: negate/multiply/divide rm32 (with EAX and EDX if necessary) depending on subop (neg/mul/idiv) + ff: increment/decrement/jump/push/call rm32 based on subop (inc/dec/jmp/push/call) + 0f 82: jump disp32 bytes away if lesser (unsigned), if CF is set (jcc/jb/jnae) + 0f 83: jump disp32 bytes away if greater or equal (unsigned), if CF is unset (jcc/jae/jnb) + 0f 84: jump disp32 bytes away if equal, if ZF is set (jcc/jz/je) + 0f 85: jump disp32 bytes away if not equal, if ZF is not set (jcc/jnz/jne) + 0f 86: jump disp32 bytes away if lesser or equal (unsigned), if ZF is set or CF is set (jcc/jbe/jna) + 0f 87: jump disp32 bytes away if greater (unsigned), if ZF is unset and CF is unset (jcc/ja/jnbe) + 0f 8c: jump disp32 bytes away if lesser (signed), if SF != OF (jcc/jl/jnge) + 0f 8d: jump disp32 bytes away if greater or equal (signed), if SF == OF (jcc/jge/jnl) + 0f 8e: jump disp32 bytes away if lesser or equal (signed), if ZF is set or SF != OF (jcc/jle/jng) + 0f 8f: jump disp32 bytes away if greater (signed), if ZF is unset and SF == OF (jcc/jg/jnle) + 0f af: multiply rm32 into r32 (imul) +Run `subx help instructions` for details on words like 'r32' and 'disp8'. +For complete details on these instructions, consult the IA-32 manual (volume 2). +There's various versions of it online, such as https://c9x.me/x86. +The mnemonics in brackets will help you locate each instruction. |