目录
- 一、概述
- 二、常用参数说明
- 三、实例
- 四、实例分析
一、概述
objdump 工具是用来显示二进制文件的信息，就是以一种可阅读的格式让你更多地了解二进制文件可能带有的附加信息。该命令常用于 Linux下反汇编目标文件或者可执行文件。
什么是反汇编
反汇编（disassembly）是指将已编译的机器码转换回可读的汇编代码的过程。在计算机系统中，程序的源代码经过编译器转换成机器码（二进制代码）后才能被计算机执行。反汇编就是将这些机器码再次转换成可读的汇编代码。
二、常用参数说明
- -C 将底层的符号名解码成用户级名字，除了去掉所开头的下划线之外，还使得 C++ 函数名以可理解的方式显示出来。
- -d 反汇编特定 section。
- -D 反汇编所有 section。
- -f 显示文件头信息。
- -h 显示目标文件各个 section 的头部摘要信息。
- -i 显示对于 -b 或者 -m 选项可用的架构和目标格式列表。
- -j name 或 --section=name 仅仅显示指定名称为 name 的 section 的信息 。
- -m 指定反汇编目标文件时使用的架构，当待反汇编文件本身没有描述架构信息的时候（比如 S-records），这个选项很有用。
- -r 显示文件的重定位入口。如果和 -d 或者 -D 一起使用，重定位部分以反汇编后的格式显示出来。
- -R 显示文件的动态重定位入口，仅仅对于动态目标文件有意义，比如某些共享库。
- -s 显示指定 section 的完整内容。默认所有的非空 section 都会被显示。
- -S 尽可能反汇编出源代码，尤其当编译的时候指定了 -g 这种调试参数时，效果比较明显。隐含了 -d 参数。
- -t 显示文件的符号表入口。类似于
nm -s提供的信息。 - -x 显示所有可用的头信息，包括符号表、重定位入口。
-x等价于-a -f -h -r -t同时指定。
要查询更多参数可以用命令：man objdump 或 objdump -H。
三、实例
- 查看本机目标结构(使用大端还是小端存储)
objdump -i
- 反汇编程序
objdump -d main.o
- 显示符号表入口:
objdump -t main.o
- 显示头文件信息
objdump -f main.o
- 查看动态库依赖项
objdump -x xxx.so | grep "NEEDED"
- 查看动态符号表
objdump -T xxx.so
## 假如想知道 xxx.so 中是否导出了符号 yyy，
## 那么命令为 objdump -T xxx.so | grep "yyy" 。
- 查看动态符号表
objdump -t xxx.so
## -T 和 -t 选项在于 -T 只能查看动态符号，如库导出的函数和引用其他库的函数，
## 而 -t 可以查看所有的符号，包括数据段的符号。
四、实例分析
- 下面首先写一个简单的 C 程序，并编译成可执行文件：
projectsauron@projectsauron:~/test$ cat test.c
#include <stdio.h>int main(){printf("hello world\n");return 0;
}
projectsauron@projectsauron:~/test$ gcc -g -o test test.c
- 显示 test 文件中的 text 段的内容：
projectsauron@projectsauron:~/test$ objdump -j .text -s testtest： 文件格式 elf64-x86-64Contents of section .text:1060 f30f1efa 31ed4989 d15e4889 e24883e4 ....1.I..^H..H..1070 f050544c 8d056601 0000488d 0def0000 .PTL..f...H.....1080 00488d3d c1000000 ff15522f 0000f490 .H.=......R/....1090 488d3d79 2f000048 8d05722f 00004839 H.=y/..H..r/..H910a0 f8741548 8b052e2f 00004885 c07409ff .t.H.../..H..t..10b0 e00f1f80 00000000 c30f1f80 00000000 ................10c0 488d3d49 2f000048 8d35422f 00004829 H.=I/..H.5B/..H)10d0 fe4889f0 48c1ee3f 48c1f803 4801c648 .H..H..?H...H..H10e0 d1fe7414 488b0505 2f000048 85c07408 ..t.H.../..H..t.10f0 ffe0660f 1f440000 c30f1f80 00000000 ..f..D..........1100 f30f1efa 803d052f 00000075 2b554883 .....=./...u+UH.1110 3de22e00 00004889 e5740c48 8b3de62e =.....H..t.H.=..1120 0000e819 ffffffe8 64ffffff c605dd2e ........d.......1130 0000015d c30f1f00 c30f1f80 00000000 ...]............1140 f30f1efa e977ffff fff30f1e fa554889 .....w.......UH.1150 e5488d3d ac0e0000 e8f3feff ffb80000 .H.=............1160 00005dc3 662e0f1f 84000000 00006690 ..].f.........f.1170 f30f1efa 41574c8d 3d3b2c00 00415649 ....AWL.=;,..AVI1180 89d64155 4989f541 544189fc 55488d2d ..AUI..ATA..UH.-1190 2c2c0000 534c29fd 4883ec08 e85ffeff ,,..SL).H...._..11a0 ff48c1fd 03741f31 db0f1f80 00000000 .H...t.1........11b0 4c89f24c 89ee4489 e741ff14 df4883c3 L..L..D..A...H..11c0 014839dd 75ea4883 c4085b5d 415c415d .H9.u.H...[]A\A]11d0 415e415f c366662e 0f1f8400 00000000 A^A_.ff.........11e0 f30f1efa c3 .....
- 反汇编
projectsauron@projectsauron:~/test$ gcc -c test.c
projectsauron@projectsauron:~/test$ objdump -d test.otest.o： 文件格式 elf64-x86-64Disassembly of section .text:0000000000000000 <main>:0: f3 0f 1e fa endbr644: 55 push %rbp5: 48 89 e5 mov %rsp,%rbp8: 48 8d 3d 00 00 00 00 lea 0x0(%rip),%rdi # f <main+0xf>f: e8 00 00 00 00 callq 14 <main+0x14>14: b8 00 00 00 00 mov $0x0,%eax19: 5d pop %rbp1a: c3 retq
- 显示文件头信息
projectsauron@projectsauron:~/test$ objdump -f test.otest.o： 文件格式 elf64-x86-64
体系结构：i386:x86-64， 标志 0x00000011：
HAS_RELOC, HAS_SYMS
起始地址 0x0000000000000000
- 反汇编 test 中的 text 段内容，并尽可能用源代码形式表示
projectsauron@projectsauron:~/test$ objdump -j .text -S test
test： 文件格式 elf64-x86-64Disassembly of section .text:0000000000001060 <_start>:1060: f3 0f 1e fa endbr641064: 31 ed xor %ebp,%ebp1066: 49 89 d1 mov %rdx,%r91069: 5e pop %rsi106a: 48 89 e2 mov %rsp,%rdx106d: 48 83 e4 f0 and $0xfffffffffffffff0,%rsp1071: 50 push %rax1072: 54 push %rsp1073: 4c 8d 05 66 01 00 00 lea 0x166(%rip),%r8 # 11e0 <__libc_csu_fini>107a: 48 8d 0d ef 00 00 00 lea 0xef(%rip),%rcx # 1170 <__libc_csu_init>1081: 48 8d 3d c1 00 00 00 lea 0xc1(%rip),%rdi # 1149 <main>1088: ff 15 52 2f 00 00 callq *0x2f52(%rip) # 3fe0 <__libc_start_main@GLIBC_2.2.5>108e: f4 hlt108f: 90 nop0000000000001090 <deregister_tm_clones>:1090: 48 8d 3d 79 2f 00 00 lea 0x2f79(%rip),%rdi # 4010 <__TMC_END__>1097: 48 8d 05 72 2f 00 00 lea 0x2f72(%rip),%rax # 4010 <__TMC_END__>109e: 48 39 f8 cmp %rdi,%rax10a1: 74 15 je 10b8 <deregister_tm_clones+0x28>10a3: 48 8b 05 2e 2f 00 00 mov 0x2f2e(%rip),%rax # 3fd8 <_ITM_deregisterTMCloneTable>10aa: 48 85 c0 test %rax,%rax10ad: 74 09 je 10b8 <deregister_tm_clones+0x28>10af: ff e0 jmpq *%rax10b1: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)10b8: c3 retq10b9: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)00000000000010c0 <register_tm_clones>:10c0: 48 8d 3d 49 2f 00 00 lea 0x2f49(%rip),%rdi # 4010 <__TMC_END__>10c7: 48 8d 35 42 2f 00 00 lea 0x2f42(%rip),%rsi # 4010 <__TMC_END__>10ce: 48 29 fe sub %rdi,%rsi10d1: 48 89 f0 mov %rsi,%rax10d4: 48 c1 ee 3f shr $0x3f,%rsi10d8: 48 c1 f8 03 sar $0x3,%rax10dc: 48 01 c6 add %rax,%rsi10df: 48 d1 fe sar %rsi10e2: 74 14 je 10f8 <register_tm_clones+0x38>10e4: 48 8b 05 05 2f 00 00 mov 0x2f05(%rip),%rax # 3ff0 <_ITM_registerTMCloneTable>10eb: 48 85 c0 test %rax,%rax10ee: 74 08 je 10f8 <register_tm_clones+0x38>10f0: ff e0 jmpq *%rax10f2: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1)10f8: c3 retq10f9: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)0000000000001100 <__do_global_dtors_aux>:1100: f3 0f 1e fa endbr641104: 80 3d 05 2f 00 00 00 cmpb $0x0,0x2f05(%rip) # 4010 <__TMC_END__>110b: 75 2b jne 1138 <__do_global_dtors_aux+0x38>110d: 55 push %rbp110e: 48 83 3d e2 2e 00 00 cmpq $0x0,0x2ee2(%rip) # 3ff8 <__cxa_finalize@GLIBC_2.2.5>1115: 001116: 48 89 e5 mov %rsp,%rbp1119: 74 0c je 1127 <__do_global_dtors_aux+0x27>111b: 48 8b 3d e6 2e 00 00 mov 0x2ee6(%rip),%rdi # 4008 <__dso_handle>1122: e8 19 ff ff ff callq 1040 <__cxa_finalize@plt>1127: e8 64 ff ff ff callq 1090 <deregister_tm_clones>112c: c6 05 dd 2e 00 00 01 movb $0x1,0x2edd(%rip) # 4010 <__TMC_END__>1133: 5d pop %rbp1134: c3 retq1135: 0f 1f 00 nopl (%rax)1138: c3 retq1139: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)0000000000001140 <frame_dummy>:1140: f3 0f 1e fa endbr641144: e9 77 ff ff ff jmpq 10c0 <register_tm_clones>0000000000001149 <main>:
#include <stdio.h>int main(){1149: f3 0f 1e fa endbr64114d: 55 push %rbp114e: 48 89 e5 mov %rsp,%rbpprintf("hello world\n");1151: 48 8d 3d ac 0e 00 00 lea 0xeac(%rip),%rdi # 2004 <_IO_stdin_used+0x4>1158: e8 f3 fe ff ff callq 1050 <puts@plt>return 0;115d: b8 00 00 00 00 mov $0x0,%eax
}1162: 5d pop %rbp1163: c3 retq1164: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1)116b: 00 00 00116e: 66 90 xchg %ax,%ax0000000000001170 <__libc_csu_init>:1170: f3 0f 1e fa endbr641174: 41 57 push %r151176: 4c 8d 3d 3b 2c 00 00 lea 0x2c3b(%rip),%r15 # 3db8 <__frame_dummy_init_array_entry>117d: 41 56 push %r14117f: 49 89 d6 mov %rdx,%r141182: 41 55 push %r131184: 49 89 f5 mov %rsi,%r131187: 41 54 push %r121189: 41 89 fc mov %edi,%r12d118c: 55 push %rbp118d: 48 8d 2d 2c 2c 00 00 lea 0x2c2c(%rip),%rbp # 3dc0 <__do_global_dtors_aux_fini_array_entry>1194: 53 push %rbx1195: 4c 29 fd sub %r15,%rbp1198: 48 83 ec 08 sub $0x8,%rsp119c: e8 5f fe ff ff callq 1000 <_init>11a1: 48 c1 fd 03 sar $0x3,%rbp11a5: 74 1f je 11c6 <__libc_csu_init+0x56>11a7: 31 db xor %ebx,%ebx11a9: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)11b0: 4c 89 f2 mov %r14,%rdx11b3: 4c 89 ee mov %r13,%rsi11b6: 44 89 e7 mov %r12d,%edi11b9: 41 ff 14 df callq *(%r15,%rbx,8)11bd: 48 83 c3 01 add $0x1,%rbx11c1: 48 39 dd cmp %rbx,%rbp11c4: 75 ea jne 11b0 <__libc_csu_init+0x40>11c6: 48 83 c4 08 add $0x8,%rsp11ca: 5b pop %rbx11cb: 5d pop %rbp11cc: 41 5c pop %r1211ce: 41 5d pop %r1311d0: 41 5e pop %r1411d2: 41 5f pop %r1511d4: c3 retq11d5: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1)11dc: 00 00 00 0000000000000011e0 <__libc_csu_fini>:11e0: f3 0f 1e fa endbr6411e4: c3 retq
...
- 显示文件的符号表入口，将底层符号解码并表示成用户级别
projectsauron@projectsauron:~/test$ objdump -t -C testtest： 文件格式 elf64-x86-64SYMBOL TABLE:
0000000000000318 l d .interp 0000000000000000 .interp
0000000000000338 l d .note.gnu.property 0000000000000000 .note.gnu.property
0000000000000358 l d .note.gnu.build-id 0000000000000000 .note.gnu.build-id
000000000000037c l d .note.ABI-tag 0000000000000000 .note.ABI-tag
00000000000003a0 l d .gnu.hash 0000000000000000 .gnu.hash
00000000000003c8 l d .dynsym 0000000000000000 .dynsym
0000000000000470 l d .dynstr 0000000000000000 .dynstr
00000000000004f2 l d .gnu.version 0000000000000000 .gnu.version
0000000000000500 l d .gnu.version_r 0000000000000000 .gnu.version_r
0000000000000520 l d .rela.dyn 0000000000000000 .rela.dyn
00000000000005e0 l d .rela.plt 0000000000000000 .rela.plt
0000000000001000 l d .init 0000000000000000 .init
0000000000001020 l d .plt 0000000000000000 .plt
0000000000001040 l d .plt.got 0000000000000000 .plt.got
0000000000001050 l d .plt.sec 0000000000000000 .plt.sec
0000000000001060 l d .text 0000000000000000 .text
00000000000011e8 l d .fini 0000000000000000 .fini
0000000000002000 l d .rodata 0000000000000000 .rodata
0000000000002010 l d .eh_frame_hdr 0000000000000000 .eh_frame_hdr
0000000000002058 l d .eh_frame 0000000000000000 .eh_frame
0000000000003db8 l d .init_array 0000000000000000 .init_array
0000000000003dc0 l d .fini_array 0000000000000000 .fini_array
0000000000003dc8 l d .dynamic 0000000000000000 .dynamic
0000000000003fb8 l d .got 0000000000000000 .got
0000000000004000 l d .data 0000000000000000 .data
0000000000004010 l d .bss 0000000000000000 .bss
0000000000000000 l d .comment 0000000000000000 .comment
0000000000000000 l d .debug_aranges 0000000000000000 .debug_aranges
0000000000000000 l d .debug_info 0000000000000000 .debug_info
0000000000000000 l d .debug_abbrev 0000000000000000 .debug_abbrev
0000000000000000 l d .debug_line 0000000000000000 .debug_line
0000000000000000 l d .debug_str 0000000000000000 .debug_str
0000000000000000 l df *ABS* 0000000000000000 crtstuff.c
0000000000001090 l F .text 0000000000000000 deregister_tm_clones
00000000000010c0 l F .text 0000000000000000 register_tm_clones
0000000000001100 l F .text 0000000000000000 __do_global_dtors_aux
0000000000004010 l O .bss 0000000000000001 completed.8061
0000000000003dc0 l O .fini_array 0000000000000000 __do_global_dtors_aux_fini_array_entry
0000000000001140 l F .text 0000000000000000 frame_dummy
0000000000003db8 l O .init_array 0000000000000000 __frame_dummy_init_array_entry
0000000000000000 l df *ABS* 0000000000000000 test.c
0000000000000000 l df *ABS* 0000000000000000 crtstuff.c
000000000000215c l O .eh_frame 0000000000000000 __FRAME_END__
0000000000000000 l df *ABS* 0000000000000000
0000000000003dc0 l .init_array 0000000000000000 __init_array_end
0000000000003dc8 l O .dynamic 0000000000000000 _DYNAMIC
0000000000003db8 l .init_array 0000000000000000 __init_array_start
0000000000002010 l .eh_frame_hdr 0000000000000000 __GNU_EH_FRAME_HDR
0000000000003fb8 l O .got 0000000000000000 _GLOBAL_OFFSET_TABLE_
0000000000001000 l F .init 0000000000000000 _init
00000000000011e0 g F .text 0000000000000005 __libc_csu_fini
0000000000000000 w *UND* 0000000000000000 _ITM_deregisterTMCloneTable
0000000000004000 w .data 0000000000000000 data_start
0000000000000000 F *UND* 0000000000000000 puts@@GLIBC_2.2.5
0000000000004010 g .data 0000000000000000 _edata
00000000000011e8 g F .fini 0000000000000000 .hidden _fini
0000000000000000 F *UND* 0000000000000000 __libc_start_main@@GLIBC_2.2.5
0000000000004000 g .data 0000000000000000 __data_start
0000000000000000 w *UND* 0000000000000000 __gmon_start__
0000000000004008 g O .data 0000000000000000 .hidden __dso_handle
0000000000002000 g O .rodata 0000000000000004 _IO_stdin_used
0000000000001170 g F .text 0000000000000065 __libc_csu_init
0000000000004018 g .bss 0000000000000000 _end
0000000000001060 g F .text 000000000000002f _start
0000000000004010 g .bss 0000000000000000 __bss_start
0000000000001149 g F .text 000000000000001b main
0000000000004010 g O .data 0000000000000000 .hidden __TMC_END__
0000000000000000 w *UND* 0000000000000000 _ITM_registerTMCloneTable
0000000000000000 w F *UND* 0000000000000000 __cxa_finalize@@GLIBC_2.2.5
- 反汇编特定段，并将汇编代码对应的文件名称和行号对应上
projectsauron@projectsauron:~/test$ objdump -d -l testtest： 文件格式 elf64-x86-64Disassembly of section .init:0000000000001000 <_init>:
_init():1000: f3 0f 1e fa endbr641004: 48 83 ec 08 sub $0x8,%rsp1008: 48 8b 05 d9 2f 00 00 mov 0x2fd9(%rip),%rax # 3fe8 <__gmon_start__>100f: 48 85 c0 test %rax,%rax1012: 74 02 je 1016 <_init+0x16>1014: ff d0 callq *%rax1016: 48 83 c4 08 add $0x8,%rsp101a: c3 retqDisassembly of section .plt:0000000000001020 <.plt>:1020: ff 35 9a 2f 00 00 pushq 0x2f9a(%rip) # 3fc0 <_GLOBAL_OFFSET_TABLE_+0x8>1026: f2 ff 25 9b 2f 00 00 bnd jmpq *0x2f9b(%rip) # 3fc8 <_GLOBAL_OFFSET_TABLE_+0x10>102d: 0f 1f 00 nopl (%rax)1030: f3 0f 1e fa endbr641034: 68 00 00 00 00 pushq $0x01039: f2 e9 e1 ff ff ff bnd jmpq 1020 <.plt>103f: 90 nopDisassembly of section .plt.got:0000000000001040 <__cxa_finalize@plt>:1040: f3 0f 1e fa endbr641044: f2 ff 25 ad 2f 00 00 bnd jmpq *0x2fad(%rip) # 3ff8 <__cxa_finalize@GLIBC_2.2.5>104b: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)Disassembly of section .plt.sec:0000000000001050 <puts@plt>:1050: f3 0f 1e fa endbr641054: f2 ff 25 75 2f 00 00 bnd jmpq *0x2f75(%rip) # 3fd0 <puts@GLIBC_2.2.5>105b: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)Disassembly of section .text:0000000000001060 <_start>:
_start():1060: f3 0f 1e fa endbr641064: 31 ed xor %ebp,%ebp1066: 49 89 d1 mov %rdx,%r91069: 5e pop %rsi106a: 48 89 e2 mov %rsp,%rdx106d: 48 83 e4 f0 and $0xfffffffffffffff0,%rsp1071: 50 push %rax1072: 54 push %rsp1073: 4c 8d 05 66 01 00 00 lea 0x166(%rip),%r8 # 11e0 <__libc_csu_fini>107a: 48 8d 0d ef 00 00 00 lea 0xef(%rip),%rcx # 1170 <__libc_csu_init>1081: 48 8d 3d c1 00 00 00 lea 0xc1(%rip),%rdi # 1149 <main>1088: ff 15 52 2f 00 00 callq *0x2f52(%rip) # 3fe0 <__libc_start_main@GLIBC_2.2.5>108e: f4 hlt108f: 90 nop0000000000001090 <deregister_tm_clones>:
deregister_tm_clones():1090: 48 8d 3d 79 2f 00 00 lea 0x2f79(%rip),%rdi # 4010 <__TMC_END__>1097: 48 8d 05 72 2f 00 00 lea 0x2f72(%rip),%rax # 4010 <__TMC_END__>109e: 48 39 f8 cmp %rdi,%rax10a1: 74 15 je 10b8 <deregister_tm_clones+0x28>10a3: 48 8b 05 2e 2f 00 00 mov 0x2f2e(%rip),%rax # 3fd8 <_ITM_deregisterTMCloneTable>10aa: 48 85 c0 test %rax,%rax10ad: 74 09 je 10b8 <deregister_tm_clones+0x28>10af: ff e0 jmpq *%rax10b1: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)10b8: c3 retq10b9: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)00000000000010c0 <register_tm_clones>:
register_tm_clones():10c0: 48 8d 3d 49 2f 00 00 lea 0x2f49(%rip),%rdi # 4010 <__TMC_END__>10c7: 48 8d 35 42 2f 00 00 lea 0x2f42(%rip),%rsi # 4010 <__TMC_END__>10ce: 48 29 fe sub %rdi,%rsi10d1: 48 89 f0 mov %rsi,%rax10d4: 48 c1 ee 3f shr $0x3f,%rsi10d8: 48 c1 f8 03 sar $0x3,%rax10dc: 48 01 c6 add %rax,%rsi10df: 48 d1 fe sar %rsi10e2: 74 14 je 10f8 <register_tm_clones+0x38>10e4: 48 8b 05 05 2f 00 00 mov 0x2f05(%rip),%rax # 3ff0 <_ITM_registerTMCloneTable>10eb: 48 85 c0 test %rax,%rax10ee: 74 08 je 10f8 <register_tm_clones+0x38>10f0: ff e0 jmpq *%rax10f2: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1)10f8: c3 retq10f9: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)0000000000001100 <__do_global_dtors_aux>:
__do_global_dtors_aux():1100: f3 0f 1e fa endbr641104: 80 3d 05 2f 00 00 00 cmpb $0x0,0x2f05(%rip) # 4010 <__TMC_END__>110b: 75 2b jne 1138 <__do_global_dtors_aux+0x38>110d: 55 push %rbp110e: 48 83 3d e2 2e 00 00 cmpq $0x0,0x2ee2(%rip) # 3ff8 <__cxa_finalize@GLIBC_2.2.5>1115: 001116: 48 89 e5 mov %rsp,%rbp1119: 74 0c je 1127 <__do_global_dtors_aux+0x27>111b: 48 8b 3d e6 2e 00 00 mov 0x2ee6(%rip),%rdi # 4008 <__dso_handle>1122: e8 19 ff ff ff callq 1040 <__cxa_finalize@plt>1127: e8 64 ff ff ff callq 1090 <deregister_tm_clones>112c: c6 05 dd 2e 00 00 01 movb $0x1,0x2edd(%rip) # 4010 <__TMC_END__>1133: 5d pop %rbp1134: c3 retq1135: 0f 1f 00 nopl (%rax)1138: c3 retq1139: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)0000000000001140 <frame_dummy>:
frame_dummy():1140: f3 0f 1e fa endbr641144: e9 77 ff ff ff jmpq 10c0 <register_tm_clones>0000000000001149 <main>:
main():
/home/projectsauron/test/test.c:31149: f3 0f 1e fa endbr64114d: 55 push %rbp114e: 48 89 e5 mov %rsp,%rbp
/home/projectsauron/test/test.c:41151: 48 8d 3d ac 0e 00 00 lea 0xeac(%rip),%rdi # 2004 <_IO_stdin_used+0x4>1158: e8 f3 fe ff ff callq 1050 <puts@plt>
/home/projectsauron/test/test.c:5115d: b8 00 00 00 00 mov $0x0,%eax
/home/projectsauron/test/test.c:61162: 5d pop %rbp1163: c3 retq1164: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1)116b: 00 00 00116e: 66 90 xchg %ax,%ax0000000000001170 <__libc_csu_init>:
__libc_csu_init():1170: f3 0f 1e fa endbr641174: 41 57 push %r151176: 4c 8d 3d 3b 2c 00 00 lea 0x2c3b(%rip),%r15 # 3db8 <__frame_dummy_init_array_entry>117d: 41 56 push %r14117f: 49 89 d6 mov %rdx,%r141182: 41 55 push %r131184: 49 89 f5 mov %rsi,%r131187: 41 54 push %r121189: 41 89 fc mov %edi,%r12d118c: 55 push %rbp118d: 48 8d 2d 2c 2c 00 00 lea 0x2c2c(%rip),%rbp # 3dc0 <__do_global_dtors_aux_fini_array_entry>1194: 53 push %rbx1195: 4c 29 fd sub %r15,%rbp1198: 48 83 ec 08 sub $0x8,%rsp119c: e8 5f fe ff ff callq 1000 <_init>11a1: 48 c1 fd 03 sar $0x3,%rbp11a5: 74 1f je 11c6 <__libc_csu_init+0x56>11a7: 31 db xor %ebx,%ebx11a9: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)11b0: 4c 89 f2 mov %r14,%rdx11b3: 4c 89 ee mov %r13,%rsi11b6: 44 89 e7 mov %r12d,%edi11b9: 41 ff 14 df callq *(%r15,%rbx,8)11bd: 48 83 c3 01 add $0x1,%rbx11c1: 48 39 dd cmp %rbx,%rbp11c4: 75 ea jne 11b0 <__libc_csu_init+0x40>11c6: 48 83 c4 08 add $0x8,%rsp11ca: 5b pop %rbx11cb: 5d pop %rbp11cc: 41 5c pop %r1211ce: 41 5d pop %r1311d0: 41 5e pop %r1411d2: 41 5f pop %r1511d4: c3 retq11d5: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1)11dc: 00 00 00 0000000000000011e0 <__libc_csu_fini>:
__libc_csu_fini():11e0: f3 0f 1e fa endbr6411e4: c3 retqDisassembly of section .fini:00000000000011e8 <_fini>:
_fini():11e8: f3 0f 1e fa endbr6411ec: 48 83 ec 08 sub $0x8,%rsp11f0: 48 83 c4 08 add $0x8,%rsp11f4: c3 retq
- 显示目标文件各个段的头部摘要信息
projectsauron@projectsauron:~/test$ objdump -h testtest： 文件格式 elf64-x86-64节：
Idx Name Size VMA LMA File off Algn0 .interp 0000001c 0000000000000318 0000000000000318 00000318 2**0CONTENTS, ALLOC, LOAD, READONLY, DATA1 .note.gnu.property 00000020 0000000000000338 0000000000000338 00000338 2**3CONTENTS, ALLOC, LOAD, READONLY, DATA2 .note.gnu.build-id 00000024 0000000000000358 0000000000000358 00000358 2**2CONTENTS, ALLOC, LOAD, READONLY, DATA3 .note.ABI-tag 00000020 000000000000037c 000000000000037c 0000037c 2**2CONTENTS, ALLOC, LOAD, READONLY, DATA4 .gnu.hash 00000024 00000000000003a0 00000000000003a0 000003a0 2**3CONTENTS, ALLOC, LOAD, READONLY, DATA5 .dynsym 000000a8 00000000000003c8 00000000000003c8 000003c8 2**3CONTENTS, ALLOC, LOAD, READONLY, DATA6 .dynstr 00000082 0000000000000470 0000000000000470 00000470 2**0CONTENTS, ALLOC, LOAD, READONLY, DATA7 .gnu.version 0000000e 00000000000004f2 00000000000004f2 000004f2 2**1CONTENTS, ALLOC, LOAD, READONLY, DATA8 .gnu.version_r 00000020 0000000000000500 0000000000000500 00000500 2**3CONTENTS, ALLOC, LOAD, READONLY, DATA9 .rela.dyn 000000c0 0000000000000520 0000000000000520 00000520 2**3CONTENTS, ALLOC, LOAD, READONLY, DATA10 .rela.plt 00000018 00000000000005e0 00000000000005e0 000005e0 2**3CONTENTS, ALLOC, LOAD, READONLY, DATA11 .init 0000001b 0000000000001000 0000000000001000 00001000 2**2CONTENTS, ALLOC, LOAD, READONLY, CODE12 .plt 00000020 0000000000001020 0000000000001020 00001020 2**4CONTENTS, ALLOC, LOAD, READONLY, CODE13 .plt.got 00000010 0000000000001040 0000000000001040 00001040 2**4CONTENTS, ALLOC, LOAD, READONLY, CODE14 .plt.sec 00000010 0000000000001050 0000000000001050 00001050 2**4CONTENTS, ALLOC, LOAD, READONLY, CODE15 .text 00000185 0000000000001060 0000000000001060 00001060 2**4CONTENTS, ALLOC, LOAD, READONLY, CODE16 .fini 0000000d 00000000000011e8 00000000000011e8 000011e8 2**2CONTENTS, ALLOC, LOAD, READONLY, CODE17 .rodata 00000010 0000000000002000 0000000000002000 00002000 2**2CONTENTS, ALLOC, LOAD, READONLY, DATA18 .eh_frame_hdr 00000044 0000000000002010 0000000000002010 00002010 2**2CONTENTS, ALLOC, LOAD, READONLY, DATA19 .eh_frame 00000108 0000000000002058 0000000000002058 00002058 2**3CONTENTS, ALLOC, LOAD, READONLY, DATA20 .init_array 00000008 0000000000003db8 0000000000003db8 00002db8 2**3CONTENTS, ALLOC, LOAD, DATA21 .fini_array 00000008 0000000000003dc0 0000000000003dc0 00002dc0 2**3CONTENTS, ALLOC, LOAD, DATA22 .dynamic 000001f0 0000000000003dc8 0000000000003dc8 00002dc8 2**3CONTENTS, ALLOC, LOAD, DATA23 .got 00000048 0000000000003fb8 0000000000003fb8 00002fb8 2**3CONTENTS, ALLOC, LOAD, DATA24 .data 00000010 0000000000004000 0000000000004000 00003000 2**3CONTENTS, ALLOC, LOAD, DATA25 .bss 00000008 0000000000004010 0000000000004010 00003010 2**0ALLOC26 .comment 0000002b 0000000000000000 0000000000000000 00003010 2**0CONTENTS, READONLY27 .debug_aranges 00000030 0000000000000000 0000000000000000 0000303b 2**0CONTENTS, READONLY, DEBUGGING, OCTETS28 .debug_info 00000301 0000000000000000 0000000000000000 0000306b 2**0CONTENTS, READONLY, DEBUGGING, OCTETS29 .debug_abbrev 000000cc 0000000000000000 0000000000000000 0000336c 2**0CONTENTS, READONLY, DEBUGGING, OCTETS30 .debug_line 00000112 0000000000000000 0000000000000000 00003438 2**0CONTENTS, READONLY, DEBUGGING, OCTETS31 .debug_str 00000299 0000000000000000 0000000000000000 0000354a 2**0CONTENTS, READONLY, DEBUGGING, OCTETS