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LD会为每个能生成为合法C符号名的段生成
__start_段名
和__stop_段名
的符号,借此可以实现不需修改ldscript的导出命令模式。参考:https://stackoverflow.com/questions/16552710/how-do-you-get-the-start-and-end-addresses-of-a-custom-elf-section
效果: