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| author | Kartik Agaram <vc@akkartik.com> | 2018-09-21 16:02:50 -0700 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2018-09-21 16:03:31 -0700 |
| commit | 45967d2106335dbd595cb43ae5732ba88b5d0553 (patch) | |
| tree | 49b750a77571037df44967f8c14a1a8553e8205c /subx/opcodes | |
| parent | bd9f6d0cd069f3504c1825c6b25c7149c13ff57a (diff) | |
| download | mu-45967d2106335dbd595cb43ae5732ba88b5d0553.tar.gz | |
4578 - subx: implement inc/dec operations
Diffstat (limited to 'subx/opcodes')
| -rw-r--r-- | subx/opcodes | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/subx/opcodes b/subx/opcodes index 77630208..41f2e65d 100644 --- a/subx/opcodes +++ b/subx/opcodes @@ -17,6 +17,22 @@ Opcodes currently supported by SubX: 39: compare: set SF if rm32 < r32 3b: compare: set SF if r32 < rm32 3d: compare: set SF if R0 < imm32 + 40: increment R0 (EAX) + 41: increment R1 (ECX) + 42: increment R2 (EDX) + 43: increment R3 (EBX) + 44: increment R4 (ESP) + 45: increment R5 (EBP) + 46: increment R6 (ESI) + 47: increment R7 (EDI) + 48: decrement R0 (EAX) + 49: decrement R1 (ECX) + 4a: decrement R2 (EDX) + 4b: decrement R3 (EBX) + 4c: decrement R4 (ESP) + 4d: decrement R5 (EBP) + 4e: decrement R6 (ESI) + 4f: decrement R7 (EDI) 50: push R0 (EAX) to stack 51: push R1 (ECX) to stack 52: push R2 (EDX) to stack @@ -63,7 +79,7 @@ Opcodes currently supported by SubX: eb: jump disp8 bytes away f4: halt f7: bitwise complement of rm32 - ff: jump/push/call rm32 based on subop + ff: inc/dec/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) |