41 lines
2.3 KiB
Markdown
41 lines
2.3 KiB
Markdown
# 目录
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- [CPU寄存器](#cpu寄存器)
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- [x86-64 Linux System V ABI的寄存器用途](#x86-64-linux-system-v-abi)
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- [Flags 标志位](#flags-标志位)
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## CPU寄存器
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### x86-64 **Linux** System V ABI
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| 寄存器 | 用途 | 调用约定 | 32位 | 16位 | 8位 |
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| ------ | ---- | -------- | ----- | ----- | --- |
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| ```%rax``` | 返回值 | Caller-saved | ```%eax``` | ```%ax``` | ```%al``` |
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| ```%rbx``` | 基址寄存器 | Callee-saved | ```%ebx``` | ```%bx``` | ```%bl``` |
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| ```%rcx``` | 传递参数 | Caller-saved | ```%ecx``` | ```%cx``` | ```%cl``` |
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| ```%rdx``` | 传递参数 | Caller-saved | ```%edx``` | ```%dx``` | ```%dl``` |
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| ```%rsi``` | 传递参数 | Caller-saved | ```%esi``` | ```%si``` | ```%sil``` |
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| ```%rdi``` | 传递参数 | Caller-saved | ```%edi``` | ```%di``` | ```%dil``` |
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| ```%rsp``` | 栈指针 | Callee-saved | ```%esp``` | ```%sp``` | ```%spl``` |
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| ```%rbp``` | 帧指针 | Callee-saved | ```%ebp``` | ```%bp``` | ```%bpl``` |
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| ```%r8``` | 传递参数 | Caller-saved | ```%r8d``` | ```%r8w``` | ```%r8b``` |
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| ```%r9``` | 传递参数 | Caller-saved | ```%r9d``` | ```%r9w``` | ```%r9b``` |
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| ```%r10``` | 临时寄存器 | Caller-saved | ```%r10d``` | ```%r10w``` | ```%r10b``` |
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| ```%r11``` | 临时寄存器 | Caller-saved | ```%r11d``` | ```%r11w``` | ```%r11b``` |
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| ```%r12``` - ```%r15``` | 被调用者保存寄存器 | Callee-saved | ```%r12d``` - ```%r15d``` | ```%r12w``` - ```%r15w``` | ```%r12b``` - ```%r15b``` |
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| **```%rip```** | 指令指针 | | ```%eip``` | ```%ip``` | |
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| **```%rflags```** | 标志寄存器 | | ```%eflags``` | ```%flags``` | |
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### Flags 标志位
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| VS显示名称 | 标志位 | 全称 | 为1时表明... | 用户态可用 |
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| ---------- | ------ | ---- | ---- | ---------- |
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| OV | OF | **O**ver**f**low Flag | 有符号数运算结果溢出 | √ |
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| UP | DF | **D**irection **F**lag | 字符串指令的处理方向递减 | √ |
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| EI | IF | **I**nterrupt **F**lag | 允许外部中断 | |
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| PL | SF | **S**ign **F**lag | 结果为负数 | √ |
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| ZR | ZF | **Z**ero **F**lag | 结果为零 | √ |
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| AC | AF | **A**uxiliary carry **F**lag | （辅助进位） | √ |
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| PE | PF | **P**arity **F**lag | 结果的二进制表示中1的个数为偶数 | √ |
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| CY | CF | **C**arry **F**lag | 无符号数运算结果溢出 | √ | |