newbie: why so many sections in elf binary?
Pawel <[email protected]>
| Newsgroups | gmane.linux.assembly |
|---|---|
| Message-ID | <[email protected]> |
Hallo Group Members. I just issued the command: prompt$ readelf --section-headers /lib/libc-2.5.so It shows 74 sections in single library (full listing at the end of mail). I wonder why there are so many of them. I guess that it is convinient somehow. Or maybe the answer is in the question: why sections were "invented", what are they for? Do You know any link that would explain it for me? Regards, Pawel. prompt$ readelf --section-headers /lib/libc-2.5.so There are 75 section headers, starting at offset 0x180420: Section Headers: [Nr] Name Type Addr Off Size ES Flg Lk Inf Al [ 0] NULL 00000000 000000 000000 00 0 0 0 [ 1] .note.ABI-tag NOTE 00bc2174 000174 000020 00 A 0 0 4 [ 2] .gnu.hash GNU_HASH 00bc2194 000194 003a80 04 A 3 0 4 [ 3] .dynsym DYNSYM 00bc5c14 003c14 008c50 10 A 4 19 4 [ 4] .dynstr STRTAB 00bce864 00c864 0055c9 00 A 0 0 1 [ 5] .gnu.version VERSYM 00bd3e2e 011e2e 00118a 02 A 3 0 2 [ 6] .gnu.version_d VERDEF 00bd4fb8 012fb8 0002b8 00 A 4 20 4 [ 7] .gnu.version_r VERNEED 00bd5270 013270 000040 00 A 4 1 4 [ 8] .rel.dyn REL 00bd52b0 0132b0 0029a8 08 A 3 0 4 [ 9] .rel.plt REL 00bd7c58 015c58 000038 08 A 3 10 4 [10] .plt PROGBITS 00bd7c90 015c90 000080 04 AX 0 0 4 [11] .text PROGBITS 00bd7d10 015d10 0f4870 00 AX 0 0 16 [12] __libc_freeres_fn PROGBITS 00ccc580 10a580 000f87 00 AX 0 0 16 [13] __libc_thread_fre PROGBITS 00ccd510 10b510 000232 00 AX 0 0 16 [14] .rodata PROGBITS 00ccd760 10b760 017ac0 00 A 0 0 32 [15] .interp PROGBITS 00ce5220 123220 000013 00 A 0 0 1 [16] .eh_frame_hdr PROGBITS 00ce5234 123234 00294c 00 A 0 0 4 [17] .eh_frame PROGBITS 00ce7b80 125b80 00de50 00 A 0 0 4 [18] .gcc_except_table PROGBITS 00cf59d0 1339d0 000251 00 A 0 0 1 [19] .hash HASH 00cf5c24 133c24 003318 04 A 3 0 4 [20] .tdata PROGBITS 00cf9200 137200 000008 00 WAT 0 0 4 [21] .tbss NOBITS 00cf9208 137208 000034 00 WAT 0 0 4 [22] .fini_array FINI_ARRAY 00cf9208 137208 000004 00 WA 0 0 4 [23] .ctors PROGBITS 00cf920c 13720c 00000c 00 WA 0 0 4 [24] .dtors PROGBITS 00cf9218 137218 000008 00 A 0 0 4 [25] __libc_subfreeres PROGBITS 00cf9220 137220 000060 00 WA 0 0 4 [26] __libc_atexit PROGBITS 00cf9280 137280 000004 00 WA 0 0 4 [27] __libc_thread_sub PROGBITS 00cf9284 137284 000008 00 WA 0 0 4 [28] .data.rel.ro PROGBITS 00cf92a0 1372a0 001afc 00 WA 0 0 32 [29] .dynamic DYNAMIC 00cfad9c 138d9c 0000f8 08 WA 4 0 4 [30] .got PROGBITS 00cfae94 138e94 00015c 04 WA 0 0 4 [31] .got.plt PROGBITS 00cfaff4 138ff4 000028 04 WA 0 0 4 [32] .data PROGBITS 00cfb020 139020 000958 00 WA 0 0 32 [33] .bss NOBITS 00cfb980 139978 002c24 00 WA 0 0 32 [34] .comment PROGBITS 00000000 139978 00ce48 00 0 0 1 [35] .gnu.warning.sigs PROGBITS 00000000 1467c0 00004d 00 0 0 32 [36] .gnu.warning.sigr PROGBITS 00000000 146820 00003b 00 0 0 32 [37] .gnu.warning.sigg PROGBITS 00000000 146860 000039 00 0 0 32 [38] .gnu.warning.tmpn PROGBITS 00000000 1468a0 000037 00 0 0 32 [39] .gnu.warning.tmpn PROGBITS 00000000 1468e0 000039 00 0 0 32 [40] .gnu.warning.temp PROGBITS 00000000 146920 000038 00 0 0 32 [41] .gnu.warning.sys_ PROGBITS 00000000 146960 000044 00 0 0 32 [42] .gnu.warning.sys_ PROGBITS 00000000 1469c0 000041 00 0 0 32 [43] .gnu.warning.gets PROGBITS 00000000 146a20 000039 00 0 0 32 [44] .gnu.warning.__me PROGBITS 00000000 146a59 00005c 00 0 0 1 [45] .gnu.warning.getp PROGBITS 00000000 146ac0 00003a 00 0 0 32 [46] .gnu.warning.setl PROGBITS 00000000 146b00 00003a 00 0 0 32 [47] .gnu.warning.re_m PROGBITS 00000000 146b40 00003d 00 0 0 32 [48] .gnu.warning.lchm PROGBITS 00000000 146b80 000038 00 0 0 32 [49] .gnu.warning.getw PROGBITS 00000000 146bc0 00007a 00 0 0 32 [50] .gnu.warning.sstk PROGBITS 00000000 146c40 000036 00 0 0 32 [51] .gnu.warning.revo PROGBITS 00000000 146c80 000038 00 0 0 32 [52] .gnu.warning.mkte PROGBITS 00000000 146cc0 000037 00 0 0 32 [53] .gnu.warning.gtty PROGBITS 00000000 146d00 000036 00 0 0 32 [54] .gnu.warning.stty PROGBITS 00000000 146d40 000036 00 0 0 32 [55] .gnu.warning.luti PROGBITS 00000000 146d80 000039 00 0 0 32 [56] .gnu.warning.chfl PROGBITS 00000000 146dc0 000039 00 0 0 32 [57] .gnu.warning.fchf PROGBITS 00000000 146e00 00003a 00 0 0 32 [58] .gnu.warning.llse PROGBITS 00000000 146e40 00003f 00 0 0 32 [59] .gnu.warning.__ge PROGBITS 00000000 146e80 000039 00 0 0 32 [60] .gnu.warning.inet PROGBITS 00000000 146ec0 00003c 00 0 0 32 [61] .gnu.warning.inet PROGBITS 00000000 146f00 00003b 00 0 0 32 [62] .gnu.warning.inet PROGBITS 00000000 146f40 00003d 00 0 0 32 [63] .gnu.warning.inet PROGBITS 00000000 146f80 00003c 00 0 0 32 [64] .gnu.warning.inet PROGBITS 00000000 146fc0 00003b 00 0 0 32 [65] .gnu.warning.inet PROGBITS 00000000 147000 00003b 00 0 0 32 [66] .gnu.warning.fatt PROGBITS 00000000 147040 000039 00 0 0 32 [67] .gnu.warning.fdet PROGBITS 00000000 147080 000039 00 0 0 32 [68] .symtab SYMTAB 00000000 1470bc 01f860 10 69 5844 4 [69] .strtab STRTAB 00000000 16691c 018961 00 0 0 1 [70] .gnu_debuglink PROGBITS 00000000 17f280 000018 00 0 0 4 [71] .gnu.liblist GNU_LIBLIST 00000000 17f298 000014 14 72 0 4 [72] .gnu.libstr STRTAB 00000000 17f2ac 000014 00 0 0 1 [73] .gnu.prelink_undo PROGBITS 00000000 17f2c0 000c8c 01 0 0 4 [74] .shstrtab STRTAB 00000000 17ff4c 0004d3 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) - 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