-d seçeneği
dynamic section hakkında bilgi gösterir. Şöyle
yaparız.
readelf -d a.out
NEEDED alanı
Eğer bir .so kütüphanesi bir başka .so kütüphanesine bağımlıysa elf dosyasında bu alan NEEDED olarak işaretlidir. Şöyle
yaparız.
$ readelf -d liba.so | grep NEEDED
0x00000001 (NEEDED) Shared library: [libc.so.6]
-debug-dump seçeneği
debug section hakkında bilgi gösterir. Açıklaması
şöyle.
The .debug_info section contains the actual debugging information. This section does not contain strings.
Şöyle
yaparız.
readelf --debug-dump filename.o
Çıktı olarak şunu
alırız.
...
Item 123:
Type of information: Data type
Name: 2b /* String #2b in ".debug_str" is "int" */
Kind of data type: Signed integer
Number of bits: 32
... some more information ...
Item 124:
Type of information: Global variable
Name: 8 /* "lvar" */
Data type defined by: Item 123
Stored at: Address 0x1234
... some more information ...
Begin item 125:
Type of information: Function
Name: 6 /* "main" */
... some more information ...
Item 126:
Type of information: Local variable
Name: 5 /* "svar" */
Data type defined by: Item 123
Stored at: Address 0x1238
... some more information ...
End item 125 /* Function "main" */
Item 127:
...
- h seçeneği
Header bilgisini gösterir. Şöyle
yaparız.
readelf -h MyApp
Çıktı olarak şunu
alırız.
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: REL (Relocatable file)
Machine: Intel 80386
Version: 0x1
Entry point address: 0x0
Start of program headers: 0 (bytes into file)
Start of section headers: 2548 (bytes into file)
Flags: 0x0
Size of this header: 52 (bytes)
Size of program headers: 0 (bytes)
Number of program headers: 0
Size of section headers: 40 (bytes)
Number of section headers: 16
Section header string table index: 13
Class alanı 32/64 bit olduğunu gösterir. 64 bit uygulamanın çıktısı
şöyledir.
ELF Header:
Magic: 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00
Class: ELF64
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: UNIX - System V
ABI Version: 0
Type: DYN (Shared object file)
Machine: Advanced Micro Devices X86-64
Version: 0x1
Entry point address: 0x1158
Start of program headers: 64 (bytes into file)
Start of section headers: 308248 (bytes into file)
Flags: 0x0
-S seçeneği
Section'lar hakkında bilgi gösterir. Şöyle
yaparız.
$ readelf -S true
There are 30 section headers, starting at offset 0x7368:
Section Headers:
[Nr] Name Type Address Offset
Size EntSize Flags Link Info Align
[ 0] NULL 0000000000000000 00000000
0000000000000000 0000000000000000 0 0 0
[ 1] .interp PROGBITS 0000000000000238 00000238
000000000000001c 0000000000000000 A 0 0 1
[ 2] .note.ABI-tag NOTE 0000000000000254 00000254
0000000000000020 0000000000000000 A 0 0 4
[ 3] .note.gnu.build-i NOTE 0000000000000274 00000274
0000000000000024 0000000000000000 A 0 0 4
...
[23] .dynamic DYNAMIC 0000000000206dd8 00006dd8
00000000000001e0 0000000000000010 WA 6 0 8
[24] .got PROGBITS 0000000000206fb8 00006fb8
0000000000000030 0000000000000008 WA 0 0 8
[25] .got.plt PROGBITS 0000000000207000 00007000
0000000000000188 0000000000000008 WA 0 0 8
[26] .data PROGBITS 00000000002071a0 000071a0
0000000000000080 0000000000000000 WA 0 0 32
[27] .bss NOBITS 0000000000207220 00007220
00000000000001a0 0000000000000000 WA 0 0 32
[28] .gnu_debuglink PROGBITS 0000000000000000 00007220
0000000000000034 0000000000000000 0 0 1
[29] .shstrtab STRTAB 0000000000000000 00007254
000000000000010f 0000000000000000 0 0 1
