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Home Backend Development Golang objdump and parse linking of local function calls?

objdump and parse linking of local function calls?

Feb 10, 2024 pm 05:57 PM

objdump 和解析本地函数调用的链接?

php小编柚子给大家介绍一种强大的工具 - objdump,它可以帮助我们解析本地函数调用的链接。objdump是一个用于分析和反汇编二进制文件的命令行工具。通过使用objdump,我们可以查看二进制文件中的函数调用和链接信息,了解函数之间的关系和调用顺序。这对于理解代码的执行流程和调试问题非常有帮助。objdump提供了丰富的选项和功能,可以满足不同场景下的需求。让我们一起来探索objdump的奥秘吧!

问题内容

如果我在 (linux amd64) .o 文件上运行 objdump -d,则会显示函数调用,但未完成链接时间解析。示例:

90:   66 89 44 24 1c          mov    %ax,0x1c(%rsp)
  95:   44 89 74 24 10          mov    %r14d,0x10(%rsp)
  9a:   e8 00 00 00 00          callq  9f <foo+0x9f>
  9f:   83 f8 ff                cmp    $0xffffffffffffffff,%eax
  a2:   74 5e                   je     102 <foo+0x102>
Copy after login

函数内的分支正确显示,但 callq 只是为链接器放入的存根(有四个字节的零可供链接器放入正确的地址)。

有没有一种方法,无需实际链接即可获取已解析函数名称的程序集列表?我不关心最终将使用的地址,只关心函数的名称。该信息必须位于 .o 文件中,因为链接器必须使用它来完成其工作。

我问这个问题是因为相关代码所在的共享库大约有 140Mb,并且需要很长时间来运行 objdump -d 来获取包含所有函数调用的 asm 转储解析为他们的真实姓名。

解决方法

是:使用 objdump -dr foo.o

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