masm64-init

Starter project for MASM64:

• Launch x64 Native Tools Command Prompt for VS 2022.
• Run scripts\build.bat
• Run with build\main.exe or devenv build\main.exe

Learning Resources:

If you are new to x86-64 Assembly I suggest:

• The Art of 64-Bit Assembly, Volume 1: x86-64 Machine Organization and Programming
• Assembly x64 Programming in easy steps

x86-64 Registers Cheat Sheet

Registers:

64	32	16	8	name
rax	eax	ax	ah/al	accumulator
rbx	ebx	bx	bh/bl	base
rcx	ecx	cx	ch/cl	counter
rdx	edx	dx	dh/dl	data
rsi	esi	si	sil	source_idx
rdi	edi	di	dil	destination_idx
rbp	ebp	bp	bpl	base_pointer
rsp	esp	sp	spl	stack_pointer
r8	r8d	r8w	r8b	general_purpose
r9	r9d	r9w	r9b	general_purpose
r10	r10d	r10w	r10b	general_purpose
r11	r11d	r11w	r11b	general_purpose
r12	r12d	r12w	r12b	general_purpose
r13	r13d	r13w	r13b	general_purpose
r14	r14d	r14w	r14b	general_purpose
r15	r15d	r15w	r15b	general_purpose

Volatile vs Non-Volatile

Type	Registers	Responsibility
Volatile	rax, rcx, rdx, r8, r9, r10, r11, rsp, xmm0–xmm5	Caller must save
Non-Volatile	rbx, rbp, rsi, rdi, r12, r13, r14, r15, xmm6–xmm15	Callee must save/restore