There are 23 section headers, starting at offset 0x31cd8:

Section Headers:
  [Nr] Name              Type            Addr     Off    Size   ES Flg Lk Inf Al
  [ 0]                   NULL            00000000 000000 000000 00      0   0  0
  [ 1] .isr_vector       PROGBITS        08000000 010000 00010c 00   A  0   0  1
  [ 2] .text             PROGBITS        0800010c 01010c 0014b0 00  AX  0   0  4
  [ 3] .rodata           PROGBITS        080015bc 020018 000000 00  WA  0   0  1
  [ 4] .init_array       INIT_ARRAY      080015bc 0115bc 000004 04  WA  0   0  4
  [ 5] .fini_array       FINI_ARRAY      080015c0 0115c0 000004 04  WA  0   0  4
  [ 6] .data             PROGBITS        20000000 020000 000018 00  WA  0   0  4
  [ 7] .bss              NOBITS          20000018 020018 000030 00  WA  0   0  4
  [ 8] ._user_heap_stack NOBITS          20000048 020048 000100 00  WA  0   0  1
  [ 9] .ARM.attributes   ARM_ATTRIBUTES  00000000 020018 000029 00      0   0  1
  [10] .debug_info       PROGBITS        00000000 020041 0065ae 00      0   0  1
  [11] .debug_abbrev     PROGBITS        00000000 0265ef 00118f 00      0   0  1
  [12] .debug_aranges    PROGBITS        00000000 027780 0008a0 00      0   0  8
  [13] .debug_ranges     PROGBITS        00000000 028020 0007e8 00      0   0  8
  [14] .debug_line       PROGBITS        00000000 028808 002c20 00      0   0  1
  [15] .debug_str        PROGBITS        00000000 02b428 002680 01  MS  0   0  1
  [16] .comment          PROGBITS        00000000 02daa8 00007c 01  MS  0   0  1
  [17] .debug_frame      PROGBITS        00000000 02db24 00248c 00      0   0  4
  [18] .debug_loc        PROGBITS        00000000 02ffb0 000014 00      0   0  1
  [19] .stabstr          STRTAB          00000000 02ffc4 00003f 00      0   0  1
  [20] .symtab           SYMTAB          00000000 030004 001180 10     21 164  4
  [21] .strtab           STRTAB          00000000 031184 000a62 00      0   0  1
  [22] .shstrtab         STRTAB          00000000 031be6 0000f2 00      0   0  1
Key to Flags:
  W (write), A (alloc), X (execute), M (merge), S (strings), I (info),
  L (link order), O (extra OS processing required), G (group), T (TLS),
  C (compressed), x (unknown), o (OS specific), E (exclude),
  y (noread), p (processor specific)