From 9dd453a19943280bc9f8cf8f1e4cb481582421e9 Mon Sep 17 00:00:00 2001 From: Key_Zhang Date: Mon, 10 Oct 2016 16:15:40 +0800 Subject: [PATCH] =?UTF-8?q?=E7=BF=BB=E8=AF=91=E5=AE=8C=E6=88=90=EF=BC=8C?= =?UTF-8?q?=E5=BC=80=E5=A7=8B=E6=A0=A1=E5=AF=B9?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- Misc/linkers.md | 24 ++++++++++++++++++++++-- 1 file changed, 22 insertions(+), 2 deletions(-) diff --git a/Misc/linkers.md b/Misc/linkers.md index 35e5767..0378eca 100644 --- a/Misc/linkers.md +++ b/Misc/linkers.md @@ -715,6 +715,8 @@ Apart from the commands we have already seen, there are a few others. The first The `INCLUDE filename` command allows to include external linker script symbols in the current one. In a linker script we can assign a value to a symbol. `ld` supports a couple of assignment operators: +`INCLUDE filename` 允许我们在当前的链接器脚本中包含外部符号。我们可以在一个链接器脚本中给一个符号赋值。 `ld` 支持一些赋值操作符： + * symbol = expression ; * symbol += expression ; * symbol -= expression ; @@ -727,6 +729,8 @@ The `INCLUDE filename` command allows to include external linker script symbols As you can note all operators are C assignment operators. For example we can use it in our linker script as: +正如你注意到的，所有操作符都是 C 赋值操作符。比如我们可以在我们的链接器脚本中使用： + ``` START_ADDRESS = 0x200000; DATA_OFFSET = 0x200000; @@ -747,6 +751,8 @@ SECTIONS As you already may noted the syntax for expressions in the linker script language is identical to that of C expressions. Besides this the control language of the linking supports following builtin functions: +你可能已经注意到了链接器脚本中表达式的语法和 C 表达式相同。除此之外，这个链接控制语言还支持如下内嵌函数： + * `ABSOLUTE` - returns absolute value of the given expression; * `ADDR` - takes the section and returns its address; * `ALIGN` - returns the value of the location counter (`.` operator) that aligned by the boundary of the next expression after the given expression; @@ -755,18 +761,32 @@ As you already may noted the syntax for expressions in the linker script languag * `NEXT` - returns the next unallocated address that is a multiple of the give expression; * `SIZEOF` - returns the size in bytes of the given named section. +* `ABSOLUTE` - 返回给定表达式的绝对值； +* `ADDR` - 接受段，返回其地址； +* `ALIGN` - 返回和给定表达式下一句的边界对齐的位置计数器（ `.` 操作符）的值； +* `DEFINED` - 如果给定符号在全局符号表中，返回 `1`，否则 `0`； +* `MAX` and `MIN` - 返回两个给定表达式中的最大、最小值； +* `NEXT` - 返回一个是当前表达式倍数的未分配地址； +* `SIZEOF` - 返回给定名字的段以字节计数的大小。 + That's all. -Conclusion +以上就是全部了。 + +总结 ----------------- This is the end of the post about linkers. We learned many things about linkers in this post, such as what is a linker and why it is needed, how to use it, etc.. +这是关于链接器文章的结尾。在这篇文章中，我们已经学习了很多关于链接器的知识，比如什么是链接器、为什么需要他、如何使用它等等... + If you have any questions or suggestions, write me an [email](kuleshovmail@gmail.com) or ping [me](https://twitter.com/0xAX) on twitter. +如果你发现文中描述有任何问题，请提交一个 PR 到 [linux-insides-zh](https://github.com/MintCN/linux-insides-zh) 。 + Please note that English is not my first language, and I am really sorry for any inconvenience. If you find any mistakes please let me know via email or send a PR. -Links +相关链接 ----------------- * [Book about Linux kernel insides](http://0xax.gitbooks.io/linux-insides/content/)