符号 etext、edata 和 end 定义在哪里?

问题描述

这是来自 Linux 手册页的代码:

This is a code from Linux man page:

#include <stdio.h>
#include <stdlib.h>

extern char etext, edata, end;

int main() {
    printf("First address past:
");
    printf("    program text (etext)      %10p
", &etext);
    printf("    initialized data (edata)  %10p
", &edata);
    printf("    uninitialized data (end)  %10p
", &end);

    exit(EXIT_SUCCESS);
}

运行时，下面的程序会产生如下输出:

when run, the program below produces output such as the following:

$ ./a.out
First address past:
    program text (etext)       0x8048568
    initialized data (edata)   0x804a01c
    uninitialized data (end)   0x804a024

etext、edata end 定义在哪里?这些符号是如何赋值的?是通过链接器还是其他方式?

Where are etext, edata end defined ? How those symbols are assigned values ? Is it by linker or something else ?

推荐答案

这些符号定义在 链接器脚本文件(死链接副本在archive.org).

These symbols are defined in a linker script file (dead link copy at archive.org).

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