最終更新:2019-09-17 (火) 08:36:26 (1682d)
objdump -t
Top / objdump -t
Display the contents of the symbol table(s)
Linux/シンボル
$ objdump -t a.out a.out: file format elf64-x86-64 SYMBOL TABLE: 0000000000400238 l d .interp 0000000000000000 .interp 0000000000400254 l d .note.ABI-tag 0000000000000000 .note.ABI-tag 0000000000400274 l d .note.gnu.build-id 0000000000000000 .note.gnu.build-id 0000000000400298 l d .gnu.hash 0000000000000000 .gnu.hash 00000000004002b8 l d .dynsym 0000000000000000 .dynsym 0000000000400318 l d .dynstr 0000000000000000 .dynstr 0000000000400356 l d .gnu.version 0000000000000000 .gnu.version 0000000000400360 l d .gnu.version_r 0000000000000000 .gnu.version_r 0000000000400380 l d .rela.dyn 0000000000000000 .rela.dyn 0000000000400398 l d .rela.plt 0000000000000000 .rela.plt 00000000004003c8 l d .init 0000000000000000 .init 00000000004003f0 l d .plt 0000000000000000 .plt 0000000000400420 l d .plt.got 0000000000000000 .plt.got 0000000000400430 l d .text 0000000000000000 .text 00000000004005f4 l d .fini 0000000000000000 .fini 0000000000400600 l d .rodata 0000000000000000 .rodata 0000000000400630 l d .eh_frame_hdr 0000000000000000 .eh_frame_hdr 0000000000400678 l d .eh_frame 0000000000000000 .eh_frame 0000000000600e10 l d .init_array 0000000000000000 .init_array 0000000000600e18 l d .fini_array 0000000000000000 .fini_array 0000000000600e20 l d .jcr 0000000000000000 .jcr 0000000000600e28 l d .dynamic 0000000000000000 .dynamic 0000000000600ff8 l d .got 0000000000000000 .got 0000000000601000 l d .got.plt 0000000000000000 .got.plt 0000000000601028 l d .data 0000000000000000 .data 0000000000601038 l d .bss 0000000000000000 .bss 0000000000000000 l d .comment 0000000000000000 .comment 0000000000000000 l df *ABS* 0000000000000000 crtstuff.c 0000000000600e20 l O .jcr 0000000000000000 __JCR_LIST__ 0000000000400460 l F .text 0000000000000000 deregister_tm_clones 00000000004004a0 l F .text 0000000000000000 register_tm_clones 00000000004004e0 l F .text 0000000000000000 __do_global_dtors_aux 0000000000601038 l O .bss 0000000000000001 completed.7594 0000000000600e18 l O .fini_array 0000000000000000 __do_global_dtors_aux_fini_array_entry 0000000000400500 l F .text 0000000000000000 frame_dummy 0000000000600e10 l O .init_array 0000000000000000 __frame_dummy_init_array_entry 0000000000000000 l df *ABS* 0000000000000000 hello.c 0000000000400537 l F .text 0000000000000011 statichoge 0000000000000000 l df *ABS* 0000000000000000 crtstuff.c 00000000004007a8 l O .eh_frame 0000000000000000 __FRAME_END__ 0000000000600e20 l O .jcr 0000000000000000 __JCR_END__ 0000000000000000 l df *ABS* 0000000000000000 0000000000600e18 l .init_array 0000000000000000 __init_array_end 0000000000600e28 l O .dynamic 0000000000000000 _DYNAMIC 0000000000600e10 l .init_array 0000000000000000 __init_array_start 0000000000400630 l .eh_frame_hdr 0000000000000000 __GNU_EH_FRAME_HDR 0000000000601000 l O .got.plt 0000000000000000 _GLOBAL_OFFSET_TABLE_ 00000000004005f0 g F .text 0000000000000002 __libc_csu_fini 0000000000000000 w *UND* 0000000000000000 _ITM_deregisterTMCloneTable 0000000000601028 w .data 0000000000000000 data_start 0000000000000000 F *UND* 0000000000000000 puts@@GLIBC_2.2.5 0000000000601038 g .data 0000000000000000 _edata 00000000004005f4 g F .fini 0000000000000000 _fini 0000000000000000 F *UND* 0000000000000000 __libc_start_main@@GLIBC_2.2.5 0000000000601028 g .data 0000000000000000 __data_start 0000000000000000 w *UND* 0000000000000000 __gmon_start__ 0000000000601030 g O .data 0000000000000000 .hidden __dso_handle 0000000000400600 g O .rodata 0000000000000004 _IO_stdin_used 0000000000400580 g F .text 0000000000000065 __libc_csu_init 0000000000601040 g .bss 0000000000000000 _end 0000000000400430 g F .text 000000000000002a _start 0000000000601038 g .bss 0000000000000000 __bss_start 0000000000400548 g F .text 0000000000000034 main 0000000000400526 g F .text 0000000000000011 hoge 0000000000000000 w *UND* 0000000000000000 _Jv_RegisterClasses 0000000000601038 g O .data 0000000000000000 .hidden __TMC_END__ 0000000000000000 w *UND* 0000000000000000 _ITM_registerTMCloneTable 00000000004003c8 g F .init 0000000000000000 _init
凡例
-t --syms Print the symbol table entries of the file. This is similar to the information provided by the nm program, although the display format is different. The format of the output depends upon the format of the file being dumped, but there are two main types. One looks like this: [ 4](sec 3)(fl 0x00)(ty 0)(scl 3) (nx 1) 0x00000000 .bss [ 6](sec 1)(fl 0x00)(ty 0)(scl 2) (nx 0) 0x00000000 fred where the number inside the square brackets is the number of the entry in the symbol table, the sec number is the section number, the fl value are the symbol's flag bits, the ty number is the symbol's type, the scl number is the symbol's storage class and the nx value is the number of auxilary entries associated with the symbol. The last two fields are the symbol's value and its name. The other common output format, usually seen with ELF based files, looks like this: 00000000 l d .bss 00000000 .bss 00000000 g .text 00000000 fred Here the first number is the symbol's value (sometimes refered to as its address). The next field is actually a set of characters and spaces indicating the flag bits that are set on the symbol. These characters are described below. Next is the section with which the symbol is associated or *ABS* if the section is absolute (ie not connected with any section), or *UND* if the section is referenced in the file being dumped, but not defined there. After the section name comes another field, a number, which for common symbols is the alignment and for other symbol is the size. Finally the symbol's name is displayed. The flag characters are divided into 7 groups as follows: "l" "g" "u" "!" The symbol is a local (l), global (g), unique global (u), neither global nor local (a space) or both global and local (!). A symbol can be neither local or global for a variety of reasons, e.g., because it is used for debugging, but it is probably an indication of a bug if it is ever both local and global. Unique global symbols are a GNU extension to the standard set of ELF symbol bindings. For such a symbol the dynamic linker will make sure that in the entire process there is just one symbol with this name and type in use. "w" The symbol is weak (w) or strong (a space). "C" The symbol denotes a constructor (C) or an ordinary symbol (a space). "W" The symbol is a warning (W) or a normal symbol (a space). A warning symbol's name is a message to be displayed if the symbol following the warning symbol is ever referenced. "I" "i" The symbol is an indirect reference to another symbol (I), a function to be evaluated during reloc processing (i) or a normal symbol (a space). "d" "D" The symbol is a debugging symbol (d) or a dynamic symbol (D) or a normal symbol (a space). "F" "f" "O" The symbol is the name of a function (F) or a file (f) or an object (O) or just a normal symbol (a space).
