Assembly
A few cheatsheet-like things about the Assembly language
Registers
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 for writing malicious Assembly code and some examples of compiling
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