当没有符号信息时，如何使用GDB for x86程序集设置断点？ [英] How to set breakpoint using GDB for x86 assembly when no symbol information is present?

问题描述

如果没有符号信息，那么如何设置使用GDB for x86汇编代码的断点，即不可能写入 b * _start 。

How do I set a breakpoint using GDB for x86 assembly code, when there is no symbol information, i.e. it is not possible to write b *_start.

我想立即停止执行，但写 b * 0 并不是很有用，因为这样会停止执行在地址 0 ，但是我需要在地址 x 相对于起始点（当没有符号信息存在）

I'd like to stop execution immediately, but writing b *0 isn't very useful, because this would stop execution at address 0, but I need to break execution at address x relative to the starting point (which is unknown when no symbol information is present).

推荐答案

使用类似 objdump -f 显示入口点地址的数值。

Use something like objdump -f to show you the numeric value of the entry point address.

将该值复制/粘贴到gdb命令中： b * 0x ... 在入口点断开。您可以从那里单步。

Copy/paste that value into a gdb command: b *0x... to break at the entry point. You can then single-step from there.

另请参阅 x86 标签wiki一些asm调试提示，如 layout reg 。

See also the bottom of the x86 tag wiki for some asm-debugging tips, like layout reg.

从 objdump -f ：

/bin/ls:     file format elf64-x86-64
architecture: i386:x86-64, flags 0x00000112:
EXEC_P, HAS_SYMS, D_PAGED
start address 0x0000000000404870          <<---- copy this address

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