edgarluque.com/content/blog/x86_64_cheatsheet.md

+++ title = "x86_64 Assembly notes" date = 2023-11-30 draft = true description = "Notes I gathered for myself as I learn." [taxonomies] categories = ["asm", "nasm", "x86_64"] +++

Here is a post I will probably update as I learn more x86_64 assembly.

AMD64 ABI Reference

From left to right, pass as many parameters as will fit in registers. The order in which registers are allocated, are:

• For non-floats: rdi, rsi, rdx, rcx, r8, r9.
• For floating-point: xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7.
• Callee saved: rsp, rbx, rbp, r12-r15
• Return value: rax
• Stack pointer: rsp
• Base pointer: rbp

Call Frame

Stack grows downwards.

caller:
    push rbp ; save old frame
    mov rbp, rsp ; init frame
    ; arguments passed in the stack are upwards
    mov r14, [rbp + 0x10]
    ; ...
    mov rsp, rbp
    pop rbp
    ret

x86_64 Cheatsheet

s	b
a	b
a	b
a	b
a	b