基础汇编指令

寄存器

本文中使用的寄存器通常为 ra, rb, rc, rd。

mov 指令

mov dst, src

一些例子：

# Moves the content of register rb into ra
mov ra, rb
# Moves the immediate 35h into ra
mov ra, 35h
# Moves the data at memory location ra into register rd
mov rd, [ra]
# Moves the data at memory location 12h into register rd
mov rd, [12h]
# Moves the content of register rc to the memory location rb.
mov [rb], rc
# Moves the immediate 07h to the memory location rb.
mov [rb], 07h

ALU 指令

instruction dst, src

将 dst 作为第一个操作数，src 作为第二个操作数，将运算结果存在 dst 中。

CMP 指令

cmp rn, rm
cmp rn, i

• dst = src: Zero flag set, Carry flag clear
• dst > src: Zero flag clear, Carry flag clear
• dst < src: Zero flag clear, Carry flag set

JUMP 指令

jxxx src

• jz/je: jump if zero/equal (Zero set)
• jne/njz: jump if not zero/equal (Zero clear)
• ja: jump if above (Zero clear, carry clear)
• jb: jump if below (Zero clear, carry set)

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