1 objdump反匯編示例

源文件main.c：

/* main.c */ #include <stdio.h>void swap(int* first, int* second) {int temp = *first;*first = *second;*second = temp; }int main(void) {int a = 10;int b = 20;printf("a = %d; b = %d;\n", a, b);swap(&a, &b);printf("a = %d; b = %d;\n", a, b);return 0; }

1.1 顯示main.c的匯編代碼

gcc -S -o main.s main.c

匯編文件main.s

.file "main.c".text.globl swap.type swap, @function swap: .LFB0:.cfi_startprocpushq %rbp.cfi_def_cfa_offset 16.cfi_offset 6, -16movq %rsp, %rbp.cfi_def_cfa_register 6movq %rdi, -24(%rbp)movq %rsi, -32(%rbp)movq -24(%rbp), %rax...

1.2 目標(biāo)文件反匯編

gcc -c -o main.o main.c objdump -s -d main.o > main.o.txt

目標(biāo)文件main.o的反匯編結(jié)果輸出到文件main.o.txt?
反匯編同時(shí)顯示源代碼

gcc -g -c -o main.o main.c objdump -S -d main.o > main.o.txt

顯示源代碼同時(shí)顯示行號(hào)

objdump -j .text -ld -C -S main.o > main.o.txt

1.3 可執(zhí)行文件反匯編

gcc -o main main.c objdump -s -d main > main.txt

反匯編同時(shí)顯示源代碼

gcc -g -o main main.c objdump -S -d main > main.txt

1.4 objdump反匯編常用參數(shù)

• objdump -d <file(s)>: 將代碼段反匯編；
• objdump -S <file(s)>: 將代碼段反匯編的同時(shí)，將反匯編代碼與源代碼交替顯示，編譯時(shí)需要使用-g參數(shù)，即需要調(diào)試信息；
• objdump -C <file(s)>: 將C++符號(hào)名逆向解析
• objdump -l <file(s)>: 反匯編代碼中插入文件名和行號(hào)
• objdump -j section <file(s)>: 僅反匯編指定的section

2 objdump幫助信息

輸出objdump幫助信息：?
objdump --help?或者?man objdump

Usage: objdump <option(s)> <file(s)>Display information from object <file(s)>.At least one of the following switches must be given:-a, --archive-headers Display archive header information-f, --file-headers Display the contents of the overall file header-p, --private-headers Display object format specific file header contents-P, --private=OPT,OPT... Display object format specific contents-h, --[section-]headers Display the contents of the section headers-x, --all-headers Display the contents of all headers-d, --disassemble Display assembler contents of executable sections-D, --disassemble-all Display assembler contents of all sections-S, --source Intermix source code with disassembly-s, --full-contents Display the full contents of all sections requested-g, --debugging Display debug information in object file-e, --debugging-tags Display debug information using ctags style-G, --stabs Display (in raw form) any STABS info in the file-W[lLiaprmfFsoRt] or--dwarf[=rawline,=decodedline,=info,=abbrev,=pubnames,=aranges,=macro,=frames,=frames-interp,=str,=loc,=Ranges,=pubtypes,=gdb_index,=trace_info,=trace_abbrev,=trace_aranges,=addr,=cu_index]Display DWARF info in the file-t, --syms Display the contents of the symbol table(s)-T, --dynamic-syms Display the contents of the dynamic symbol table-r, --reloc Display the relocation entries in the file-R, --dynamic-reloc Display the dynamic relocation entries in the file @<file> Read options from <file>-v, --version Display this program's version number-i, --info List object formats and architectures supported-H, --help Display this informationThe following switches are optional:-b, --target=BFDNAME Specify the target object format as BFDNAME-m, --architecture=MACHINE Specify the target architecture as MACHINE-j, --section=NAME Only display information for section NAME-M, --disassembler-options=OPT Pass text OPT on to the disassembler-EB --endian=big Assume big endian format when disassembling-EL --endian=little Assume little endian format when disassembling--file-start-context Include context from start of file (with -S)-I, --include=DIR Add DIR to search list for source files-l, --line-numbers Include line numbers and filenames in output-F, --file-offsets Include file offsets when displaying information-C, --demangle[=STYLE] Decode mangled/processed symbol namesThe STYLE, if specified, can be `auto', `gnu',`lucid', `arm', `hp', `edg', `gnu-v3', `java'or `gnat'-w, --wide Format output for more than 80 columns-z, --disassemble-zeroes Do not skip blocks of zeroes when disassembling--start-address=ADDR Only process data whose address is >= ADDR--stop-address=ADDR Only process data whose address is <= ADDR--prefix-addresses Print complete address alongside disassembly--[no-]show-raw-insn Display hex alongside symbolic disassembly--insn-width=WIDTH Display WIDTH bytes on a single line for -d--adjust-vma=OFFSET Add OFFSET to all displayed section addresses--special-syms Include special symbols in symbol dumps--prefix=PREFIX Add PREFIX to absolute paths for -S--prefix-strip=LEVEL Strip initial directory names for -S--dwarf-depth=N Do not display DIEs at depth N or greater--dwarf-start=N Display DIEs starting with N, at the same depthor deeper--dwarf-check Make additional dwarf internal consistency checks. objdump: supported targets: elf64-x86-64 elf32-i386 elf32-x86-64 a.out-i386-linux pei-i386 pei-x86-64 elf64-l1om elf64-k1om elf64-little elf64-big elf32-little elf32-big plugin srec symbolsrec verilog tekhex binary ihex objdump: supported architectures: i386 i386:x86-64 i386:x64-32 i8086 i386:intel i386:x86-64:intel i386:x64-32:intel l1om l1om:intel k1om k1om:intel pluginThe following i386/x86-64 specific disassembler options are supported for use with the -M switch (multiple options should be separated by commas):x86-64 Disassemble in 64bit modei386 Disassemble in 32bit modei8086 Disassemble in 16bit modeatt Display instruction in AT&T syntaxintel Display instruction in Intel syntaxatt-mnemonicDisplay instruction in AT&T mnemonicintel-mnemonicDisplay instruction in Intel mnemonicaddr64 Assume 64bit address sizeaddr32 Assume 32bit address sizeaddr16 Assume 16bit address sizedata32 Assume 32bit data sizedata16 Assume 16bit data sizesuffix Always display instruction suffix in AT&T syntax Report bugs to <http://bugzilla.redhat.com/bugzilla/>.

3 參考資料

[1]?objdump反匯編用法示例?
[2]?objdump命令的使用?
[3]?GNU Binary Utilities: objdump - Sourceware?
[4]?stackoverflow - objdump

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