链接脚本中使用 ENTRY 的功能？

发布于 2021-11-09 17:58:01 浏览：1395 订阅该版

5 个回答

李肯陪你玩赚嵌入式 认证专家 2021-11-09

2022年度和2023年度RT-Thread社区优秀开源布道师，COC深圳城市开发者社区主理人，专注于嵌入式物联网的架构设计

jhb 2021-11-09

这家伙很懒，什么也没写！

jhb 2021-11-09

这家伙很懒，什么也没写！

李肯陪你玩赚嵌入式 2021-11-09

2022年度和2023年度RT-Thread社区优秀开源布道师，COC深圳城市开发者社区主理人，专注于嵌入式物联网的架构设计

李肯陪你玩赚嵌入式 2021-11-09

2022年度和2023年度RT-Thread社区优秀开源布道师，COC深圳城市开发者社区主理人，专注于嵌入式物联网的架构设计

李肯陪你玩赚嵌入式 2021-11-09

2022年度和2023年度RT-Thread社区优秀开源布道师，COC深圳城市开发者社区主理人，专注于嵌入式物联网的架构设计

jhb 2021-11-09

这家伙很懒，什么也没写！

jhb 2021-11-09

这家伙很懒，什么也没写！

李肯陪你玩赚嵌入式 2021-11-09

2022年度和2023年度RT-Thread社区优秀开源布道师，COC深圳城市开发者社区主理人，专注于嵌入式物联网的架构设计

@jhb 参考下这个[英文说明](http://www.math.utah.edu/docs/info/ld_3.html#SEC19)
```c
The Entry Point
The linker command language includes a command specifically for defining the first executable instruction in an output file (its entry point). Its argument is a symbol name:

ENTRY(symbol)
Like symbol assignments, the ENTRY command may be placed either as an independent command in the command file, or among the section definitions within the SECTIONS command--whatever makes the most sense for your layout.

ENTRY is only one of several ways of choosing the entry point. You may indicate it in any of the following ways (shown in descending order of priority: methods higher in the list override methods lower down).

the `-e' entry command-line option;
the ENTRY(symbol) command in a linker control script;
the value of the symbol start, if present;
the address of the first byte of the .text section, if present;
The address 0.
For example, you can use these rules to generate an entry point with an assignment statement: if no symbol start is defined within your input files, you can simply define it, assigning it an appropriate value---

start = 0x2020;
The example shows an absolute address, but you can use any expression. For example, if your input object files use some other symbol-name convention for the entry point, you can just assign the value of whatever symbol contains the start address to start:

start = other_symbol ;
```