读取so文件信息工具——readelf

工具：readelf

常用参数：

-a 显示elf格式的信息

-h 显示elf头信息

举例：

#readelf -a libart.so

#readelf -h libart.so

[root@localhost vwang]# readelf -h libart.so

ELF Header:

Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00

Class: ELF32

Data: 2's complement, little endian

Version: 1 (current)

OS/ABI: UNIX - System V

ABI Version: 0

Type: DYN (Shared object file)

Machine: ARM

Version: 0x1

Entry point address: 0x0

Start of program headers: 52 (bytes into file)

Start of section headers: 5670572 (bytes into file)

Flags: 0x5000000, Version5 EABI

Size of this header: 52 (bytes)

Size of program headers: 32 (bytes)

Number of program headers: 10

Size of section headers: 40 (bytes)

Number of section headers: 31

Section header string table index: 28

判断so位数：Magic项中第五个字节，01为32位，02为64位。