如何通过链接描述文件在特定地址处放置符号？ [英] How to place a symbol at certain address trough the linker script?

问题描述

这是关于GNU链接器的。

It is about GNU Linker.

我有一个名为 myVar 的变量（可以说）。现在，我希望将变量放置在内存中的特定地址。

I have a (lets say) variable named myVar. Now I want my variable to be placed at certain address in the memory.

我使用的编译器具有 __ attribute__（（blablabla））可以解决问题。但是，我决定使用链接描述文件。

The compiler I use, has an __attribute__ ((blablabla)) that does the trick. However I decide to use the linker script.

由于现在我设法将变量放在链接程序脚本的特定地址处，如下所示：

Since now I managed to place the variable at certain address from the linker script just like this:

myVar  = 0xDEAD;

它确实有效。问题是链接器很愚蠢，有时会在我的地址上部署其他变量。两者的行为都像在联盟中一样。

And it actually works. The problem is that the linker is stupid and occasionally deploys other variables over the address of mine. And both in a way act like they are in a union.

我认为我需要以某种方式告诉链接器该地址的长度已被占用，不应被触摸。

I think that somehow I need to tell the linker that this address with this length is occupied and should not be touched.

无论如何，我想您已经明白了。有帮助吗？

Anyway I guess You get the idea. Any help?

推荐答案

我将开始合并c源代码和链接器。

I'd start to merge c source and linker.

在链接脚本中定义一个新部分，例如：

Define a new section into linker script, like:

MEMORY
{
  ...
  my_data       (rwx) : ORIGIN = your_start_addr, LENGTH = section_length
}

SECTIONS
{
  /* ... */

  .myVarSection section_address :
  {
    KEEP(*(.mySection)) 
  } > my_data

  /* ... */
}

然后，您可以在源文件中定义变量，例如：

Then you can define your variable in source file like:

uint16_t __attribute__((section (".mySection"))) myVar = 0xDEAD;

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