Several commands for viewing the program symbol table

Objdump-t XXX.O

  [email protected]:~/documents/encrypchip$ objdump-t main.omain.o:file format Elf32-littlesymbol TAB le:00000000 l DF *abs* 00000000 main.c00000000 l d. Text 00000000. text00000000 l d. Data 00000000. data0000 0000 L D. BSS 00000000. bss00000000 l D. Mdebug.abi32 00000000. mdebug.abi3200000000 L. Rodata 0000000 0. rodata00000000 L D. Reginfo 00000000. reginfo00000000 L D. Pdr 00000000. pdr00000000 L. Comment 000         00000. comment00000000 l D. Gnu.attributes 00000000. gnu.attributes00000000 g F. Text 000000DC demo100000000 *und* 00000000 GetIdChipSerialNo00000000 *und* 00000000 printf00000000 *und* 00000000 putchar000 000DC g F. Text 0000027c demo200000000 *und* 00000000 _alpu_rand00000000 *und* 00000000 GETTIMEOFDA y00000000 *und* 00000000 alpuc_process00000000 *und* 00000000 puts00000358 g F. Text 0000003c main< /code> 

Readelf-h XXX.O

[email protected]:~/documents/encrypchip$ readelf-h main.o ELF header:magic:7f 4c 46 01 01 01 00 00 00 00 0   0 xx class:elf32 data:2 ' s complement, little endian                       Version:1 (current) Os/abi:unix-system V ABI Version:   0 Type:rel (relocatable file) machine:mips R3000 version:0x1 Entry Point address:0x0 Start of program headers:0 (by tes into file) Start of section headers:1624 (bytes into file) flags:0x1005, Nore Order, CPIC, O32, mips1 size of this header:52 (bytes) Size of program headers:0 (bytes) Numb Er of program headers:0 Size of Sections headers:40 (bytes) Number of section headers:15 Se Ction Header String TablE index:12 

Readelf-s MAIN.O

[email protected]:~/documents/encrypchip$ readelf-s main.o Symbol table '. Symtab ' contains Entries:Num:Va Lue Size Type Bind Vis Ndx Name 0:00000000 0 notype LOCAL DEFAULT UND 1:00000000 0 FILE LOC AL default ABS main.c 2:00000000 0 section local default 1 3:00000000 0 section local default 3 4:0  0000000 0 Section local default 4 5:00000000 0 sections local default 8 6:00000000 0 section Local     Default 9 7:00000000 0 section local default 5 8:00000000 0 section local default 6 9:00000000    0 section local default ten 10:00000000 0 section local default one 11:00000000-FUNC GLOBAL Default 1 demo112:00000000 0 notype Global default UND getidchipserialno13:00000000 0 notype global default UND p rintf14:00000000 0 Notype Global default UND PUTCHAR15:000000DC 636 FUNC Global Default 1 demo216:0000000 0 0 Notype GLOBAL DEfault UND _alpu_rand17:00000000 0 notype Global default UND gettimeofday18:00000000 0 notype Global Default UND alpuc_process19:00000000 0 notype Global default UND puts20:00000358 FUNC GLOBAL default 1 main

NM XXX.O contrasts the difference between the symbol table generated by the g++ compiler and the GCC generation.

[email protected]:~/Documents/encrypchip$ nm main.o #g++ compile     U _Z10_alpu_randv     U _Z13alpuc_processPhS_     U _Z17GetIdChipSerialNoPh00000000 T _Z5demo1v000000dc T _Z5demo2v     U gettimeofday00000358 T main     U printf     U putchar     U puts[email protected]:~/Documents/encrypchip$ mipsel-openwrt-linux-gcc -c main.c mipsel-openwrt-linux-gcc: warning: environment variable ‘STAGING_DIR‘ not defined[email protected]:~/Documents/encrypchip$ nm main.o #gcc compile     U GetIdChipSerialNo     U _alpu_rand     U alpuc_process00000000 T demo1000000dc T demo2         U gettimeofday00000358 T main     U printf     U putchar     U puts

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Several commands for viewing the program symbol table