I've been playing around with/debugging/disassembling binaries on the iPhone. The first obstacle is that the binaries are encrypted and dissembler can not read them. This can be overcome by dumpin...

This is kind of a weird and un-Swift-thonic question, so bear with me. I want to do in Swift something like the same thing I'm currently doing in Objective-C/C++, so I'll start by describing that. ...

Are there any major differences between PE, ELF and Mach-O? I mean, are does one have capabilities the others don't? Can one carry more information then the others? Or are they just a different con...

I'm having a hard time understanding the absolute path that a @loader_path within a file refers to. user@local:~$ otool -L zlib.so zlib.so: @loader_path/../../libz.1.dylib (compatibility version...

When using Clang's or GCC's Darwin backends to create executables for OSX, the flag -mmacosx-version-min=version can be used to set the earliest version of OSX the executable will run on. Is there...

from PyQt6.QtWidgets import * from model.Department import Department from view.main_window import Ui_Form from model.Department import Department, Employee class Homewidget(QWidget,Ui_Form): d...

Is it possible to write in Go for iPhone? I think following steps are required Compile Go as ARM Mach-O binary (I expect GCCGO be able to do that) Compile iPhone app as static library (I think it...

I'm trying to implement a tiny compiler for macOS. I'm running macOS 11.5 on a MacBook Pro with M1. The assembly encoding works fine and I'm quite happy with the result (when handed over to Clang c...

Trying out snmalloc on Macos I wondered why all the created binaries are >256MiB. It turns out that zero-initialized static inline data members are lowered in a weird way on Mac OS X, on both AR...

I am new to MacOS & MacOS programming. I would like to know how an application is working (by simply having a glimpse of the binary's imported system APIs for learning). I tried otool, printed ...

I have a program that generates self-modifying code (see https://tigress.wtf/selfModify.html in case you're interested). It runs on x86 Darwin and Linux. On Darwin, I compile with gcc -g -segprot ...

What's structure of a dsym file generated when build the app. I know it contain DWARF debug info, but what's a dsym file. I want to read the DWARF info in it. Is it just a Mach-O binary file that ...

What causes the error Found an unexpected Mach-O header code: 1918975009 in xCode 6 I archived my project to send out as an ad hoc build and it builds/links/archives just fine but when I'm in t...

Hello I'm trying to find the address of a string in lldb on mac os. In GDB I would use the find command with the addresses to search between. But I cannot find such a command for lldb, I know that...

How to see some basic information about a MacOS binary file, specifically what was used to build it, which frameworks it is linked against and what system calls it is using? I tried nm and otool -...

This question and answer describe how to read data from a Mach-O section with Objective-C on modern OS X/macOS versions: Crash reading bytes from getsectbyname The described answer works. I'm tryi...

Symbols in mach-o files can be marked as 'indirect' (I in output from nm, defined in the headers using the constant N_INDR). It seems this type of symbol is rarely used in practice (or perhaps has ...

(See Updates at end of this post) For $reasons, I need to codesign an old Director projector that we can no longer re-publish (no access to original source code or to Director). I'm doing this b...

Let's assume that I have a .a fat library which is built for several architectures (e.g. armv7, armv7s, i386, x86_64, arm64). Library is built for iOS (has cmd LC_VERSION_MIN_IPHONEOS and version 6...

Anyone know of an equivalent to Mach-O's two-level namespace symbol resolution in ELF/linux? I want code that links to lib+sym, not sym. I'm trying to do what could best be described as precompila...

Running this code off my Mac computer, using command: nasm -f macho64 -o max.a maximum.asm This is the code I am attempting to run on my computer that finds the largest number inside an array. ...

Got this error for the first time, I have looked around and cannot find a solution to help me, I have cleaned my build and also checked to make sure I am compiling for the latest firmware. This ha...

The problem: I have 2 MH_EXECUTE iOS binary files (compiled, no source code). Lets name them binary1 and binary2. I try to switch between them before UIApplicationMain is called! 1 try I success...

I cannot compile my project for the device or simulator anymore. I get 13 Apple Mach-O-Linker errors. It all started after I failed attempt to use sharekit. Here is the log from the error: ld: war...

Is it possible to alter the way that an existing x86-64 binary references and/or calls one particular function. Specifically, is it possible to alter the binary such nothing happens (similar to a n...