# 在程序入口处打断点 ## 例子 $ strip a.out $ readelf -h a.out ELF Header: Magic: 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00 Class: ELF64 Data: 2's complement, little endian Version: 1 (current) OS/ABI: UNIX - System V ABI Version: 0 Type: EXEC (Executable file) Machine: Advanced Micro Devices X86-64 Version: 0x1 Entry point address: 0x400440 Start of program headers: 64 (bytes into file) Start of section headers: 4496 (bytes into file) Flags: 0x0 Size of this header: 64 (bytes) Size of program headers: 56 (bytes) Number of program headers: 9 Size of section headers: 64 (bytes) Number of section headers: 29 Section header string table index: 28 ## 技巧 当调试没有调试信息的程序时，直接运行`start`命令是没有效果的： (gdb) start Function "main" not defined. 如果不知道main在何处，那么可以在程序入口处打断点。先通过`readelf`获得入口地址，然后： (gdb) b *0x400440 (gdb) r ## 贡献者 xmj