Linux内核导出的符号 [英] Linux kernel exported symbols

问题描述

我想检查Linux内核导出的符号列表. 所以我启动命令，

I want to check the list of symbol exported by the Linux kernel. So I fire the command,

# cat /proc/kallsyms
0000000000000000 D per_cpu__irq_stack_union
0000000000000000 D __per_cpu_start
0000000000004000 D per_cpu__gdt_page
0000000000005000 d per_cpu__exception_stacks
000000000000b000 d per_cpu__idt_desc
000000000000b010 d per_cpu__xen_cr0_value
000000000000b018 D per_cpu__xen_vcpu
000000000000b020 D per_cpu__xen_vcpu_info
000000000000b060 d per_cpu__mc_buffer
000000000000c570 D per_cpu__xen_mc_irq_flags

这是我得到的输出. 我的问题是，此输出中每个字段的含义是什么? 第一个字段看起来像地址，第二个字段我没有得到任何参考. 有人可以向我解释第二字段中D，d，t，T，s的含义吗?

This is the output I got. My question is that, what is the meaning of each field in this output? The first field looks like the address, I didn't get any reference for second field. Can anybody explain to me the meaning of the values, D,d,t,T,s in second field?

推荐答案

第二列中的字符与nm的输出具有相同的含义:

The characters in the second column have the same meaning they do in the output from nm:

D d该符号位于已初始化的数据部分中.

D d The symbol is in the initialized data section.

S s该符号位于小对象的未初始化数据部分中.

S s The symbol is in an uninitialized data section for small objects.

T t该符号在文本(代码)部分中.

T t The symbol is in the text (code) section.

大写符号是全局/导出的；小写字母是本地未导出的符号.

Uppercase symbols are global/exported; lowercase are local unexported symbols.

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