PEMessage

ELF Format Cheatsheet

Introduction

Executable and Linkable Format (ELF), is the default binary format on Linux-based systems.

Compilation

Developing Android apps without Android Studio (Debian 12)

If you're looking to develop an Android app you might be led to Android Studio. It's the IDE recommended and developed by Google for the express purpose of Android development. It does what it needs to, but if you look at the system requirements you will see some alarming numbers. If you're using an older system, or simply don't want to use AndroidStudio, this is the guide for you.

Installing packages

We won't be using many apt packages due to permissions issues and incompatible versions. That being said:

$ sudo apt install openjdk-17-jdk sdkmanager kotlin

In the kernel source directory, run

make O=/tmp/linux/arm64 ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- -j60 defconfig all

Then create an Alpine aarch64 image following https://hackmd.io/@starnight/Run_Alpine_on_QEMU_aarch64_Virtual_Machine

wget https://dl-cdn.alpinelinux.org/alpine/latest-stable/releases/aarch64/netboot/vmlinuz-lts https://dl-cdn.alpinelinux.org/alpine/latest-stable/releases/aarch64/netboot/config-lts

	// $ cc -o checker checker.c
	// $ ./checker
	// $ ffmpeg -i output-%02d.ppm -r 60 output.mp4
	#include <stdio.h>

	int main()
	{
	char buf[256];
	for (int i = 0; i < 60; ++i) {
	snprintf(buf, sizeof(buf), "output-%02d.ppm", i);

	Cheef's Grand APDU List Smartcard Selected Information APDU list
	Reference: http://web.archive.org/web/20090630004017/http://cheef.ru/docs/HowTo/APDU.info

	#------------+------------------------+------------------------+----------------------+--------------------------------+
	\|ClaIns P1 P2\|Lc Send Data \|Le Recv Data \| Specification \| Description \|
	+------------+------------------------+------------------------+----------------------+--------------------------------+
	\| 04 \| ISO 7816-9 6.3 \| DEACTIVATE FILE \|
	\| A0 04 00 00 00 \| 3GPP TS 11.11 \| INVALIDATE \|
	\| A0 04 00 00 00 \| SAGEM SCT U34 6.15 \| INVALIDATE \|
	+------------+------------------------+------------------------+----------------------+--------------------------------+

	#!/usr/bin/env python

	try:
	import gdb
	inside_gdb = True
	except ImportError:
	inside_gdb = False


	if inside_gdb:

	# Put this in a file BLAH/dump-type.py and then put this in your ~/.gdbinit file
	# (or type it at the GDB prompt):
	#
	# source BLAH/dump-type.py
	#
	# Then you can say:
	#
	# (gdb) help jimb-dump-type
	#
	# and you should get a help message.

	#include <tinyformat.h>
	#include <unwind.h>
	#include <cxxabi.h>
	#include <dlfcn.h>

	struct android_backtrace_state {
	void **current;
	void **end;
	};