[问题]如何查看一个so文件里面提供的所有函数(symbols)？
发表于 ： 2007-04-02 13:18
例如ati fglrx自己的libGL.so，我想知道这个文件里面提供的所有函数，如何查看呢？
ldd看的是连接的库eexpress 写了：readelf可以啊。ldd可以看调用库啊。
代码： 全选
stlxv@stlxvcomputer:~/ds-gui/libdld/diassembler$ readelf -a libdld.so
ELF 头：
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 (共享目标文件)
Machine: Intel 80386
Version: 0x1
入口点地址： 0x570
程序头起点： 52 (bytes into file)
Start of section headers: 5168 (bytes into file)
标志： 0x0
本头的大小： 52 (字节)
程序头大小： 32 (字节)
程序头数量： 4
节头大小： 40 (字节)
节头数量： 24
字符串表索引节头： 23
节头：
[Nr] Name Type Addr Off Size ES 囗囗囗 Lk Inf Al
[ 0] NULL 00000000 000000 000000 00 0 0 0
[ 1] .hash HASH 000000b4 0000b4 0000b8 04 A 2 0 4
[ 2] .dynsym DYNSYM 0000016c 00016c 0001b0 10 A 3 11 4
[ 3] .dynstr STRTAB 0000031c 00031c 0000e4 00 A 0 0 1
[ 4] .gnu.version VERSYM 00000400 000400 000036 02 A 2 0 2
[ 5] .gnu.version_r VERNEED 00000438 000438 000030 00 A 3 1 4
[ 6] .rel.dyn REL 00000468 000468 000038 08 A 2 0 4
[ 7] .rel.plt REL 000004a0 0004a0 000038 08 A 2 9 4
[ 8] .init PROGBITS 000004d8 0004d8 000017 00 AX 0 0 4
[ 9] .plt PROGBITS 000004f0 0004f0 000080 04 AX 0 0 4
[10] .text PROGBITS 00000570 000570 0009f4 00 AX 0 0 16
[11] .fini PROGBITS 00000f64 000f64 00001c 00 AX 0 0 4
[12] .rodata PROGBITS 00000f80 000f80 000152 00 A 0 0 1
[13] .eh_frame PROGBITS 000010d4 0010d4 000004 00 A 0 0 4
[14] .ctors PROGBITS 000020d8 0010d8 000008 00 WA 0 0 4
[15] .dtors PROGBITS 000020e0 0010e0 000008 00 WA 0 0 4
[16] .jcr PROGBITS 000020e8 0010e8 000004 00 WA 0 0 4
[17] .dynamic DYNAMIC 000020ec 0010ec 0000c8 08 WA 3 0 4
[18] .got PROGBITS 000021b4 0011b4 000014 04 WA 0 0 4
[19] .got.plt PROGBITS 000021c8 0011c8 000028 04 WA 0 0 4
[20] .data PROGBITS 000021f0 0011f0 000008 00 WA 0 0 4
[21] .bss NOBITS 00002200 0011f8 00041c 00 WA 0 0 32
[22] .comment PROGBITS 00000000 0011f8 000186 00 0 0 1
[23] .shstrtab STRTAB 00000000 00137e 0000b1 00 0 0 1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings)
I (info), L (link order), G (group), x (unknown)
O (extra OS processing required) o (OS specific), p (processor specific)
There are no section groups in this file.
程序头：
Type Offset VirtAddr PhysAddr FileSiz MemSiz 囗囗囗 Align
LOAD 0x000000 0x00000000 0x00000000 0x010d8 0x010d8 R E 0x1000
LOAD 0x0010d8 0x000020d8 0x000020d8 0x00120 0x00544 RW 0x1000
DYNAMIC 0x0010ec 0x000020ec 0x000020ec 0x000c8 0x000c8 RW 0x4
GNU_STACK 0x000000 0x00000000 0x00000000 0x00000 0x00000 RW 0x4
Section to Segment mapping:
段节...
00 .hash .dynsym .dynstr .gnu.version .gnu.version_r .rel.dyn .rel.plt .init .plt .text .fini .rodata .eh_frame
01 .ctors .dtors .jcr .dynamic .got .got.plt .data .bss
02 .dynamic
03
Dynamic section at offset 0x10ec contains 21 entries:
标记 类型 名称/值
0x00000001 (NEEDED) 共享库：[libc.so.6]
0x0000000e (SONAME) Library soname: [libdld.so.0]
0x0000000c (INIT) 0x4d8
0x0000000d (FINI) 0xf64
0x00000004 (HASH) 0xb4
0x00000005 (STRTAB) 0x31c
0x00000006 (SYMTAB) 0x16c
0x0000000a (STRSZ) 228 (bytes)
0x0000000b (SYMENT) 16 (bytes)
0x00000003 (PLTGOT) 0x21c8
0x00000002 (PLTRELSZ) 56 (bytes)
0x00000014 (PLTREL) REL
0x00000017 (JMPREL) 0x4a0
0x00000011 (REL) 0x468
0x00000012 (RELSZ) 56 (bytes)
0x00000013 (RELENT) 8 (bytes)
0x6ffffffe (VERNEED) 0x438
0x6fffffff (VERNEEDNUM) 1
0x6ffffff0 (VERSYM) 0x400
0x6ffffffa (RELCOUNT) 2
0x00000000 (NULL) 0x0
重定位节 “.rel.dyn” 位于偏移量 0x468 含有 7 个条目：
Offset Info Type Sym.Value Sym. Name
000021f0 00000008 R_386_RELATIVE
000021f4 00000008 R_386_RELATIVE
000021b4 00000d06 R_386_GLOB_DAT 00002204 __initialized
000021b8 00001306 R_386_GLOB_DAT 00000000 __cxa_finalize
000021bc 00001706 R_386_GLOB_DAT 00002220 __instructions
000021c0 00001806 R_386_GLOB_DAT 00000000 _Jv_RegisterClasses
000021c4 00001906 R_386_GLOB_DAT 00000000 __gmon_start__
重定位节 “.rel.plt” 位于偏移量 0x4a0 含有 7 个条目：
Offset Info Type Sym.Value Sym. Name
000021d4 00000b07 R_386_JUMP_SLOT 00000ae4 isValidTemplate
000021d8 00000c07 R_386_JUMP_SLOT 0000063c init_instructions
000021dc 00000e07 R_386_JUMP_SLOT 00000aaa init_lib
000021e0 00001007 R_386_JUMP_SLOT 00000000 malloc
000021e4 00001307 R_386_JUMP_SLOT 00000000 __cxa_finalize
000021e8 00001907 R_386_JUMP_SLOT 00000000 __gmon_start__
000021ec 00001a07 R_386_JUMP_SLOT 00000000 strcpy
There are no unwind sections in this file.
Symbol table '.dynsym' contains 27 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 00000000 0 NOTYPE LOCAL DEFAULT UND
1: 000004d8 0 SECTION LOCAL DEFAULT 8
2: 00000570 0 SECTION LOCAL DEFAULT 10
3: 00000f64 0 SECTION LOCAL DEFAULT 11
4: 00000f80 0 SECTION LOCAL DEFAULT 12
5: 000010d4 0 SECTION LOCAL DEFAULT 13
6: 000020d8 0 SECTION LOCAL DEFAULT 14
7: 000020e0 0 SECTION LOCAL DEFAULT 15
8: 000020e8 0 SECTION LOCAL DEFAULT 16
9: 000021f0 0 SECTION LOCAL DEFAULT 20
10: 00002200 0 SECTION LOCAL DEFAULT 21
11: 00000ae4 131 FUNC GLOBAL DEFAULT 10 isValidTemplate
12: 0000063c 1134 FUNC GLOBAL DEFAULT 10 init_instructions
13: 00002204 4 OBJECT GLOBAL DEFAULT 21 __initialized
14: 00000aaa 53 FUNC GLOBAL DEFAULT 10 init_lib
15: 000004d8 0 FUNC GLOBAL DEFAULT 8 _init
16: 00000000 392 FUNC GLOBAL DEFAULT UND malloc@GLIBC_2.0 (2)
17: 000021f8 0 NOTYPE GLOBAL DEFAULT ABS __bss_start
18: 00000f64 0 FUNC GLOBAL DEFAULT 11 _fini
19: 00000000 182 FUNC WEAK DEFAULT UND __cxa_finalize@GLIBC_2.1.3 (3)
20: 00000b67 969 FUNC GLOBAL DEFAULT 10 diassemble
21: 000021f8 0 NOTYPE GLOBAL DEFAULT ABS _edata
22: 0000261c 0 NOTYPE GLOBAL DEFAULT ABS _end
23: 00002220 1020 OBJECT GLOBAL DEFAULT 21 __instructions
24: 00000000 0 NOTYPE WEAK DEFAULT UND _Jv_RegisterClasses
25: 00000000 0 NOTYPE WEAK DEFAULT UND __gmon_start__
26: 00000000 34 FUNC GLOBAL DEFAULT UND strcpy@GLIBC_2.0 (2)
Histogram for bucket list length (total of 17 buckets):
Length Number % of total Coverage
0 6 ( 35.3%)
1 7 ( 41.2%) 43.8%
2 3 ( 17.6%) 81.2%
3 1 ( 5.9%) 100.0%
版本符号节“.gnu.version”含有 27 个条目：
地址： 0000000000000400 偏移量：0x000400 连接：2 (.dynsym)
000: 0 (*本地*) 0 (*本地*) 0 (*本地*) 0 (*本地*)
004: 0 (*本地*) 0 (*本地*) 0 (*本地*) 0 (*本地*)
008: 0 (*本地*) 0 (*本地*) 0 (*本地*) 1 (*全局*)
00c: 1 (*全局*) 1 (*全局*) 1 (*全局*) 1 (*全局*)
010: 2 (GLIBC_2.0) 1 (*全局*) 1 (*全局*) 3 (GLIBC_2.1.3)
014: 1 (*全局*) 1 (*全局*) 1 (*全局*) 1 (*全局*)
018: 0 (*本地*) 0 (*本地*) 2 (GLIBC_2.0)
Version needs section '.gnu.version_r' contains 1 entries:
地址：0x0000000000000438 Offset: 0x000438 Link to section: 3 (.dynstr)
000000: Version: 1 文件：libc.so.6 计数：2
0x0010: Name: GLIBC_2.1.3 标志：无 版本：3
0x0020: Name: GLIBC_2.0 标志：无 版本：2