Midnite指挥官ELF观察者 - 符号是什么意思？

Question

我有一个小程序，在Midnite Commander中查看时看起来像这样：

/home/adrian/Imperas/mb_boot /startup.MICROBLAZE.elf                                                                                  486/486               100%
/home/adrian/Imperas/mb_boot/startup.MICROBLAZE.elf: ELF 32-bit MSB  executable, version 1 (SYSV), dynamically linked (uses shared libs), not stripped
100000f0 T _actualstart
100012b4 A __bss_start
10001228 d _DYNAMIC
100012b4 A _edata
100012b4 A _end
100012a8 d _GLOBAL_OFFSET_TABLE_
1000010c t _handle_exception
1000010c t _handle_hwexception
1000010c t _interrupt_handler
10000110 T _start
10000128 t _vector_hw_exception
10000120 t _vector_interrupt
10000118 t _vector_sw_exception

各种符号，例如_vector_sw_exception对应于我在汇编中的内容 - 但A，T，t等等是什么意思？

Answer 1

来自nm(1)手册页：

       "A" The symbol's value is absolute, and will not be changed by
           further linking.

     

...

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

等等。