# 显示程序原始机器码 ## 例子 #include <stdio.h> int main(void) { printf("Hello, world\n"); return 0; } ## 技巧 使用“disassemble /r”命令可以用16进制形式显示程序的原始机器码。以上面程序为例： (gdb) disassemble /r main Dump of assembler code for function main: 0x0000000000400530 <+0>: 55 push %rbp 0x0000000000400531 <+1>: 48 89 e5 mov %rsp,%rbp 0x0000000000400534 <+4>: bf e0 05 40 00 mov $0x4005e0,%edi 0x0000000000400539 <+9>: e8 d2 fe ff ff callq 0x400410 <puts@plt> 0x000000000040053e <+14>: b8 00 00 00 00 mov $0x0,%eax 0x0000000000400543 <+19>: 5d pop %rbp 0x0000000000400544 <+20>: c3 retq End of assembler dump. (gdb) disassemble /r 0x0000000000400534,+4 Dump of assembler code from 0x400534 to 0x400538: 0x0000000000400534 <main+4>: bf e0 05 40 00 mov $0x4005e0,%edi End of assembler dump. 详情参见[gdb手册](https://sourceware.org/gdb/onlinedocs/gdb/Machine-Code.html) ## 贡献者 nanxiao