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kernel_Notes/Zim/Programme/elf.txt
geekard 5ef7c20052 Add New Notes
2012-08-08 15:17:56 +08:00

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Content-Type: text/x-zim-wiki
Wiki-Format: zim 0.4
Creation-Date: 2012-05-22T13:09:44+08:00
====== elf ======
Created Tuesday 22 May 2012
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: EXEC (Executable file)
Machine: Intel 80386
Version: 0x1
Entry point address: 0x8048460
Start of program headers: 52 (bytes into file)
Start of section headers: 4572 (bytes into file)
Flags: 0x0
Size of this header: 52 (bytes)
Size of program headers: 32 (bytes)
Number of program headers: 8
Size of section headers: 40 (bytes)
Number of section headers: 37
Section header string table index: 34
**Section Headers:**
[Nr] Name Type Addr Off Size ES Flg Lk Inf Al
[ 0] NULL 00000000 000000 000000 00 0 0 0
[ 1] .interp PROGBITS 08048134 000134 000013 00 A 0 0 1
[ 2] .note.ABI-tag NOTE 08048148 000148 000020 00 A 0 0 4
[ 3] .note.gnu.build-i NOTE 08048168 000168 000024 00 A 0 0 4
[ 4] .hash HASH 0804818c 00018c 000040 04 A 6 0 4
[ 5] .gnu.hash GNU_HASH 080481cc 0001cc 000024 04 A 6 0 4
[ 6]__ .dynsym __ DYNSYM 080481f0 0001f0 0000b0 10 A 7 1 4
[ 7]__ .dynstr __ STRTAB 080482a0 0002a0 000072 00 A 0 0 1
[ 8] .gnu.version VERSYM 08048312 000312 000016 02 A 6 0 2
[ 9] .gnu.version_r VERNEED 08048328 000328 000020 00 A 7 1 4
[10]** .rel.dyn ** REL 08048348 000348 000010 08 A 6 0 4
[11]** .rel.plt ** REL 08048358 000358 000040 08 A 6 13 4
[12] .init PROGBITS 08048398 000398 00002e 00 AX 0 0 4
[13] .plt PROGBITS 080483d0 0003d0 000090 04 AX 0 0 16
[14] .text PROGBITS 08048460 000460 00021c 00 AX 0 0 16
[15] .fini PROGBITS 0804867c 00067c 00001a 00 AX 0 0 4
[16] .rodata PROGBITS 08048698 000698 00006a 00 A 0 0 4
[17] .eh_frame_hdr PROGBITS 08048704 000704 000034 00 A 0 0 4
[18] .eh_frame PROGBITS 08048738 000738 0000c0 00 A 0 0 4
[19] .ctors PROGBITS 080497f8 0007f8 000008 00 WA 0 0 4
[20] .dtors PROGBITS 08049800 000800 000008 00 WA 0 0 4
[21] .jcr PROGBITS 08049808 000808 000004 00 WA 0 0 4
[22] .dynamic DYNAMIC 0804980c 00080c 0000d0 08 WA 7 0 4
[23] .got PROGBITS 080498dc 0008dc 000004 04 WA 0 0 4
[24] .got.plt PROGBITS 080498e0 0008e0 00002c 04 WA 0 0 4
[25] .data PROGBITS 0804990c 00090c 000008 00 WA 0 0 4
[26] .bss NOBITS 08049920 000914 00000c 00 WA 0 0 32
[27] .comment PROGBITS 00000000 000914 000027 01 MS 0 0 1
[28] .debug_aranges PROGBITS 00000000 00093b 000020 00 0 0 1
[29] .debug_info PROGBITS 00000000 00095b 000328 00 0 0 1
[30] .debug_abbrev PROGBITS 00000000 000c83 0000f8 00 0 0 1
[31] .debug_line PROGBITS 00000000 000d7b 0000d4 00 0 0 1
[32] .debug_str PROGBITS 00000000 000e4f 000218 01 MS 0 0 1
[33] .debug_loc PROGBITS 00000000 001067 00002c 00 0 0 1
[34]__ .shstrtab __ STRTAB 00000000 001093 000147 00 0 0 1
[35]__ .symtab __ SYMTAB 00000000 0017a4 000510 10 36 55 4
[36]__ .strtab __ STRTAB 00000000 001cb4 000277 00 0 0 1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings)
I (info), L (link order), G (group), T (TLS), E (exclude), x (unknown)
O (extra OS processing required) o (OS specific), p (processor specific)
#shstrtab标示该段对应的内容为一个字符串表，表中的字符串对应每个段的名称。
#symtab标示该段对应的内容为一个符号表，表中每个符号的名称放在.strtab表中。
#strtab对应的段中放的是符号表中各符号的名称
#dynsym表示段中放的是需要动态链接的符号
#dynstr表示段中存放的时需要动态链接的符号的名称(和dynsym配合使用)
#一般dynsym中的符号是symtab中的一部分，后者包含的用于link editing 和dynamic linking的所有符号。
There are no section groups in this file.
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
PHDR 0x000034 0x08048034 0x08048034 0x00100 0x00100 R E 0x4
INTERP 0x000134 0x08048134 0x08048134 0x00013 0x00013 R 0x1
[Requesting program interpreter: /lib/ld-linux.so.2]
LOAD 0x000000 0x08048000 0x08048000 0x007f8 0x007f8 R E 0x1000
LOAD 0x0007f8 0x080497f8 0x080497f8 0x0011c 0x00134 RW 0x1000
DYNAMIC 0x00080c 0x0804980c 0x0804980c 0x000d0 0x000d0 RW 0x4
NOTE 0x000148 0x08048148 0x08048148 0x00044 0x00044 R 0x4
GNU_EH_FRAME 0x000704 0x08048704 0x08048704 0x00034 0x00034 R 0x4
GNU_STACK 0x000000 0x00000000 0x00000000 0x00000 0x00000 RW 0x4
Section to Segment mapping:
Segment Sections...
00
01 .interp
02 .interp .note.ABI-tag .note.gnu.build-id .hash .gnu.hash .dynsym .dynstr .gnu.version .gnu.version_r .rel.dyn .rel.plt .init .plt .text .fini .rodata .eh_frame_hdr .eh_frame
03 .ctors .dtors .jcr .dynamic .got .got.plt .data .bss
04 .dynamic
05 .note.ABI-tag .note.gnu.build-id
06 .eh_frame_hdr
07
Dynamic section at offset 0x80c contains 21 entries:
Tag Type Name/Value
0x00000001 (NEEDED) Shared library: [libc.so.6]
0x0000000c (INIT) 0x8048398
0x0000000d (FINI) 0x804867c
0x00000004 (HASH) 0x804818c
0x6ffffef5 (GNU_HASH) 0x80481cc
0x00000005 (STRTAB) 0x80482a0
0x00000006 (SYMTAB) 0x80481f0
0x0000000a (STRSZ) 114 (bytes)
0x0000000b (SYMENT) 16 (bytes)
0x00000015 (DEBUG) 0x0
0x00000003 (PLTGOT) 0x80498e0
0x00000002 (PLTRELSZ) 64 (bytes)
0x00000014 (PLTREL) REL
0x00000017 (JMPREL) 0x8048358
0x00000011 (REL) 0x8048348
0x00000012 (RELSZ) 16 (bytes)
0x00000013 (RELENT) 8 (bytes)
0x6ffffffe (VERNEED) 0x8048328
0x6fffffff (VERNEEDNUM) 1
0x6ffffff0 (VERSYM) 0x8048312
0x00000000 (NULL) 0x0
Relocation section '.rel.dyn' at offset 0x348 contains 2 entries:
Offset Info Type Sym.Value Sym. Name
080498dc 00000506 R_386_GLOB_DAT 00000000 __gmon_start__
08049920 00000905 R_386_COPY 08049920 stdout
Relocation section '.rel.plt' at offset 0x358 contains 8 entries:
Offset Info Type Sym.Value Sym. Name
080498ec 00000107 R_386_JUMP_SLOT 00000000 printf
080498f0 00000207 R_386_JUMP_SLOT 00000000 fflush
080498f4 00000307 R_386_JUMP_SLOT 00000000 sleep
080498f8 00000407 R_386_JUMP_SLOT 00000000 puts
080498fc 00000507 R_386_JUMP_SLOT 00000000 __gmon_start__
08049900 00000607 R_386_JUMP_SLOT 00000000 exit
08049904 00000707 R_386_JUMP_SLOT 00000000 __libc_start_main
08049908 00000807 R_386_JUMP_SLOT 00000000 putchar
There are no unwind sections in this file.
Symbol table '.dynsym' contains 11 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 00000000 0 NOTYPE LOCAL DEFAULT UND
1: 00000000 0 FUNC GLOBAL DEFAULT UND printf@GLIBC_2.0 (2)
2: 00000000 0 FUNC GLOBAL DEFAULT UND fflush@GLIBC_2.0 (2)
3: 00000000 0 FUNC GLOBAL DEFAULT UND sleep@GLIBC_2.0 (2)
4: 00000000 0 FUNC GLOBAL DEFAULT UND puts@GLIBC_2.0 (2)
5: 00000000 0 NOTYPE WEAK DEFAULT UND __gmon_start__
6: 00000000 0 FUNC GLOBAL DEFAULT UND exit@GLIBC_2.0 (2)
7: 00000000 0 FUNC GLOBAL DEFAULT UND __libc_start_main@GLIBC_2.0 (2)
8: 00000000 0 FUNC GLOBAL DEFAULT UND putchar@GLIBC_2.0 (2)
9: 08049920 4 OBJECT GLOBAL DEFAULT 26 stdout@GLIBC_2.0 (2)
10: 0804869c 4 OBJECT GLOBAL DEFAULT 16 _IO_stdin_used
Symbol table '.symtab' contains 81 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 00000000 0 NOTYPE LOCAL DEFAULT UND
1: 08048134 0 SECTION LOCAL DEFAULT 1
2: 08048148 0 SECTION LOCAL DEFAULT 2
3: 08048168 0 SECTION LOCAL DEFAULT 3
4: 0804818c 0 SECTION LOCAL DEFAULT 4
5: 080481cc 0 SECTION LOCAL DEFAULT 5
6: 080481f0 0 SECTION LOCAL DEFAULT 6
7: 080482a0 0 SECTION LOCAL DEFAULT 7
8: 08048312 0 SECTION LOCAL DEFAULT 8
9: 08048328 0 SECTION LOCAL DEFAULT 9
10: 08048348 0 SECTION LOCAL DEFAULT 10
11: 08048358 0 SECTION LOCAL DEFAULT 11
12: 08048398 0 SECTION LOCAL DEFAULT 12
13: 080483d0 0 SECTION LOCAL DEFAULT 13
14: 08048460 0 SECTION LOCAL DEFAULT 14
15: 0804867c 0 SECTION LOCAL DEFAULT 15
16: 08048698 0 SECTION LOCAL DEFAULT 16
17: 08048704 0 SECTION LOCAL DEFAULT 17
18: 08048738 0 SECTION LOCAL DEFAULT 18
19: 080497f8 0 SECTION LOCAL DEFAULT 19
20: 08049800 0 SECTION LOCAL DEFAULT 20
21: 08049808 0 SECTION LOCAL DEFAULT 21
22: 0804980c 0 SECTION LOCAL DEFAULT 22
23: 080498dc 0 SECTION LOCAL DEFAULT 23
24: 080498e0 0 SECTION LOCAL DEFAULT 24
25: 0804990c 0 SECTION LOCAL DEFAULT 25
26: 08049920 0 SECTION LOCAL DEFAULT 26
27: 00000000 0 SECTION LOCAL DEFAULT 27
28: 00000000 0 SECTION LOCAL DEFAULT 28
29: 00000000 0 SECTION LOCAL DEFAULT 29
30: 00000000 0 SECTION LOCAL DEFAULT 30
31: 00000000 0 SECTION LOCAL DEFAULT 31
32: 00000000 0 SECTION LOCAL DEFAULT 32
33: 00000000 0 SECTION LOCAL DEFAULT 33
34: 00000000 0 FILE LOCAL DEFAULT ABS init.c
35: 00000000 0 FILE LOCAL DEFAULT ABS initfini.c
36: 00000000 0 FILE LOCAL DEFAULT ABS crtstuff.c
37: 080497f8 0 OBJECT LOCAL DEFAULT 19 __CTOR_LIST__
38: 08049800 0 OBJECT LOCAL DEFAULT 20 __DTOR_LIST__
39: 08049808 0 OBJECT LOCAL DEFAULT 21 __JCR_LIST__
40: 08048490 0 FUNC LOCAL DEFAULT 14 __do_global_dtors_aux
41: 08049924 1 OBJECT LOCAL DEFAULT 26 completed.6110
42: 08049928 4 OBJECT LOCAL DEFAULT 26 dtor_idx.6112
43: 080484f0 0 FUNC LOCAL DEFAULT 14 frame_dummy
44: 00000000 0 FILE LOCAL DEFAULT ABS crtstuff.c
45: 080497fc 0 OBJECT LOCAL DEFAULT 19 __CTOR_END__
46: 080487f4 0 OBJECT LOCAL DEFAULT 18 __FRAME_END__
47: 08049808 0 OBJECT LOCAL DEFAULT 21 __JCR_END__
48: 08048650 0 FUNC LOCAL DEFAULT 14 __do_global_ctors_aux
49: 00000000 0 FILE LOCAL DEFAULT ABS initfini.c
50: 00000000 0 FILE LOCAL DEFAULT ABS color.c
51: 080497f8 0 NOTYPE LOCAL DEFAULT 19 __init_array_end
52: 0804980c 0 OBJECT LOCAL DEFAULT 22 _DYNAMIC
53: 080497f8 0 NOTYPE LOCAL DEFAULT 19 __init_array_start
54: 080498e0 0 OBJECT LOCAL DEFAULT 24 _GLOBAL_OFFSET_TABLE_
55: 08048640 2 FUNC GLOBAL DEFAULT 14 __libc_csu_fini
56: 08048642 0 FUNC GLOBAL HIDDEN 14 __i686.get_pc_thunk.bx
57: 0804990c 0 NOTYPE WEAK DEFAULT 25 data_start
58: 00000000 0 FUNC GLOBAL DEFAULT UND printf@@GLIBC_2.0
59: 00000000 0 FUNC GLOBAL DEFAULT UND fflush@@GLIBC_2.0
60: 08049914 0 NOTYPE GLOBAL DEFAULT ABS _edata
61: 00000000 0 FUNC GLOBAL DEFAULT UND sleep@@GLIBC_2.0
62: 0804867c 0 FUNC GLOBAL DEFAULT 15 _fini
63: 08049804 0 OBJECT GLOBAL HIDDEN 20 __DTOR_END__
64: 0804990c 0 NOTYPE GLOBAL DEFAULT 25 __data_start
65: 00000000 0 FUNC GLOBAL DEFAULT UND puts@@GLIBC_2.0
66: 00000000 0 NOTYPE WEAK DEFAULT UND __gmon_start__
67: 00000000 0 FUNC GLOBAL DEFAULT UND exit@@GLIBC_2.0
68: 08049910 0 OBJECT GLOBAL HIDDEN 25 __dso_handle
69: 0804869c 4 OBJECT GLOBAL DEFAULT 16 _IO_stdin_used
70: 00000000 0 FUNC GLOBAL DEFAULT UND __libc_start_main@@GLIBC_
71: 080485d0 97 FUNC GLOBAL DEFAULT 14 __libc_csu_init
72: 00000000 0 FUNC GLOBAL DEFAULT UND putchar@@GLIBC_2.0
73: 0804992c 0 NOTYPE GLOBAL DEFAULT ABS _end
74: 08048460 0 FUNC GLOBAL DEFAULT 14 _start
75: 08048698 4 OBJECT GLOBAL DEFAULT 16 _fp_hw
76: 08049920 4 OBJECT GLOBAL DEFAULT 26 stdout@@GLIBC_2.0
77: 08049914 0 NOTYPE GLOBAL DEFAULT ABS __bss_start
78: 08048514 176 FUNC GLOBAL DEFAULT 14 main
79: 00000000 0 NOTYPE WEAK DEFAULT UND _Jv_RegisterClasses
80: 08048398 0 FUNC GLOBAL DEFAULT 12 _init
Histogram for bucket list length (total of 3 buckets):
Length Number % of total Coverage
0 0 ( 0.0%)
1 0 ( 0.0%) 0.0%
2 1 ( 33.3%) 20.0%
3 1 ( 33.3%) 50.0%
4 0 ( 0.0%) 50.0%
5 1 ( 33.3%) 100.0%
Histogram for `.gnu.hash' bucket list length (total of 2 buckets):
Length Number % of total Coverage
0 0 ( 0.0%)
1 2 (100.0%) 100.0%
Version symbols section '.gnu.version' contains 11 entries:
Addr: 0000000008048312 Offset: 0x000312 Link: 6 (.dynsym)
000: 0 (*local*) 2 (GLIBC_2.0) 2 (GLIBC_2.0) 2 (GLIBC_2.0)
004: 2 (GLIBC_2.0) 0 (*local*) 2 (GLIBC_2.0) 2 (GLIBC_2.0)
008: 2 (GLIBC_2.0) 2 (GLIBC_2.0) 1 (*global*)
Version needs section '.gnu.version_r' contains 1 entries:
Addr: 0x0000000008048328 Offset: 0x000328 Link: 7 (.dynstr)
000000: Version: 1 File: libc.so.6 Cnt: 1
0x0010: Name: GLIBC_2.0 Flags: none Version: 2
Notes at offset 0x00000148 with length 0x00000020:
Owner Data size Description
GNU 0x00000010 NT_GNU_ABI_TAG (ABI version tag)
OS: Linux, ABI: 2.6.32
Notes at offset 0x00000168 with length 0x00000024:
Owner Data size Description
GNU 0x00000014 NT_GNU_BUILD_ID (unique build ID bitstring)
Build ID: 112a16370d2ef7589b7ba4184a7ebaad4a0e3d77
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