| description |
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A few cheatsheet-like things about the Assembly language |
Generally, r-prefixed registers are 64-bit, e-prefixed registers are 32-bit, non-prefixed registers are 16-bit, and l-suffixed registers are 8-bit. For r8-15 see the special cases below (source):
| 64-bit register | Lower 32 bits | Lower 16 bits | Lower 8 bits |
|---|---|---|---|
rax | eax | ax | al |
rbx | ebx | bx | bl |
rcx | ecx | cx | cl |
rdx | edx | dx | dl |
rsi | esi | si | sil |
rdi | edi | di | dil |
rbp | ebp | bp | bpl |
rsp | esp | sp | spl |
r8 | r8d | r8w | r8b (r8l) |
r9 | r9d | r9w | r9b (r9l) |
r10 | r10d | r10w | r10b (r10l) |
r11 | r11d | r11w | r11b (r11l) |
r12 | r12d | r12w | r12b (r12l) |
r13 | r13d | r13w | r13b (r13l) |
r14 | r14d | r14w | r14b (r14l) |
r15 | r15d | r15w | r15b (r15l) |
See shellcode.md for writing malicious Assembly code and some examples of compiling