Hello everyone, this is IoT Heart. GDB is a debugging tool frequently used by Linux developers, and I believe most readers are familiar with using the gdb command to debug programs. So, are you curious:Why can gdb debug our programs? In this article, we will explore this.1. What is GDB? GDB is a debugger for … Read more
We know that ptrace frequently issues PTRACE_GETREGS and PTRACE_SETREGS commands, modifying the PC register, allowing the process to be controlled by gdb and execute related commands at the trace point. This article uses a simple program to demonstrate basic debugging tasks using gdb. What to Debug Based on the understanding of ptrace, we can summarize … Read more
GDB uses the ptrace system call to implement its functionality. This article provides a brief overview of ptrace. Ptrace The ptrace system call /* kernel/ptrace.c */ #define __NR_ptrace 117 __SYSCALL(__NR_ptrace, sys_ptrace) When using ptrace, you need to include<span>/sys/ptrace.h</span>. When calling the ptrace system call, you need to send requests based on different requests, which are … Read more
This article is aimed at those who want to develop a debugger for the Linux Armv8a architecture. It can serve as a reference, and I will use my experience from developing two debuggers to clearly describe the key technical details in as simple language as possible.Due to space limitations, this article will only discuss the … Read more
This article is an excellent piece from the KX forum. Author ID on KX forum: Ylarod One When we first encountered this issue, we found that in the Linux system, we can use memfd_create and execve to execute ELF in memory. However, on Android, we encountered the following problem: CANNOT LINK EXECUTABLE "/data/local/tmp/payload": library "libicu.so" … Read more
1. Introduction This article discusses the renowned GDB. We won’t mention its prestigious background; like its sibling GCC, it was born with a golden key and holds an irreplaceable position in the GNU family. Every embedded development engineer has likely used gdb to debug programs; if you haven’t, it only indicates your development experience hasn’t … Read more
This article is a highlight from the KX forum Author from KX forumID: ScUpax0s The goals of this article are: Main goal: Understand the debugging principles of GDB and learn the use of ptrace. Secondary goal: Implement a tiny debugger that can be used for tracing. Terminology: tracer: The one who traces tracee: The one … Read more
What is GDB GDB stands for the GNU Project debugger, primarily used for debugging user-mode applications. According to the official documentation, GDB supports debugging applications written in the following languages: Ada Assembly C C++ D Fortran Go Objective-C OpenCL Modula-2 Pascal Rust Of course, the most common use is for debugging applications written in C/C++. … Read more