動作確認

CentOS 6.5

各セクションのアドレスなどの情報を表示する

$readelf -S sample.elf
There are 34 section headers, starting at offset 0xc5864:

Section Headers:
  [Nr] Name              Type            Addr     Off    Size   ES Flg Lk Inf Al
  [ 0]                   NULL            00000000 000000 000000 00      0   0  0
  [ 1] .boot             PROGBITS        00000000 008000 000240 00  AX  0   0  4
  [ 2] .text             PROGBITS        00000240 008240 00a4c4 00  AX  0   0  4
  [ 3] .text.startup     PROGBITS        0000a704 012704 00001c 00  AX  0   0  4
  [ 4] .handoff          PROGBITS        0000ff40 017f40 00004c 00  AX  0   0  4
  [ 5] .mmu_tbl          PROGBITS        00010000 018000 004000 00   A  0   0  1
  [ 6] .init             PROGBITS        00014000 01c000 000018 00  AX  0   0  4
  [ 7] .fini             PROGBITS        00014018 01c018 000018 00  AX  0   0  4
  [ 8] .glue_7           PROGBITS        00014030 01c030 000000 00  AX  0   0  4
  [ 9] .glue_7t          PROGBITS        00014030 01c030 000000 00  AX  0   0  4
  [10] .rodata           PROGBITS        00014030 01c030 0001c0 00   A  0   0  4
  [11] .eh_frame         PROGBITS        000141f0 01c1f0 000004 00   A  0   0  4
  [12] .jcr              PROGBITS        000141f4 01c1f4 000004 00  WA  0   0  4
  [13] .init_array       INIT_ARRAY      000141f8 01c1f8 000004 00  WA  0   0  4
  [14] .comment          PROGBITS        000141fc 01d32c 000030 01  MS  0   0  1
  [15] .fini_array       FINI_ARRAY      000141fc 01c1fc 000004 00  WA  0   0  4
  [16] .ARM.attributes   ARM_ATTRIBUTES  00014200 01d35c 00003f 00      0   0  1
  [17] .data             PROGBITS        00014200 01c200 001128 00  WA  0   0  8
  [18] .init_array.00000 PROGBITS        00015328 01d328 000004 00  WA  0   0  4
  [19] .bss              NOBITS          00015340 01d32c 00acc0 00  WA  0   0 64
  [20] .heap             NOBITS          00020000 01d32c 001000 00  WA  0   0  1
  [21] .stack            NOBITS          ffff0000 020000 006000 00  WA  0   0  1
  [22] .debug_info       PROGBITS        00000000 01d39b 0068e0 00      0   0  1
  [23] .debug_abbrev     PROGBITS        00000000 023c7b 00198f 00      0   0  1
  [24] .debug_loc        PROGBITS        00000000 02560a 0019a8 00      0   0  1
  [25] .debug_aranges    PROGBITS        00000000 026fb8 000340 00      0   0  8
  [26] .debug_line       PROGBITS        00000000 0272f8 002f07 00      0   0  1
  [27] .debug_macinfo    PROGBITS        00000000 02a1ff 098919 00      0   0  1
  [28] .debug_str        PROGBITS        00000000 0c2b18 001999 01  MS  0   0  1
  [29] .debug_frame      PROGBITS        00000000 0c44b4 00124c 00      0   0  4
  [30] .debug_ranges     PROGBITS        00000000 0c5700 000018 00      0   0  1
  [31] .shstrtab         STRTAB          00000000 0c5718 00014b 00      0   0  1
  [32] .symtab           SYMTAB          00000000 0c5db4 001e00 10     33 307  4
  [33] .strtab           STRTAB          00000000 0c7bb4 000f76 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)

参考

(抜粋の上、意訳)

PROGBITS : programに関係するdata
SYMTAB : symbol table
REL : relocation entries
NOBITS : empty. データを持たない
STRTAB : string table
DYNAMIC : dynamic linkingに関する詳細
NULL : inactive、かつ、どのsectionにも関係しない

AddrとOffの意味については調査中であるが、例としてAddr:240, Off:08240の場合、0x240で始まるsection(.text)を0x8240に配置しているということかもしれない。