The Call Of The Unicore Mac OS

The download version of Extreme Unicorn Racing for Mac is 1.0. The download was scanned for viruses by our system. We also recommend you check the files before installation. The contents of the download are original and were not modified in any way. This Mac app is distributed free of charge. Recently my main dev machine is a MacBook running OS X, so it felt reasonable to fiddle with making system calls of that platform. By the way, a system call is a function of the kernel invoked by a userspace program and it can be something like writing to a file descriptor, or even exiting.

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The next step in my playing with chroot escapes is crafting some shellcode. Recently my main dev machine is a MacBook running OS X, so it felt reasonable to fiddle with making system calls of that platform.

TheHunter: Call of the Wild™. Mystery of Unicorn Castle: The Beastmaster. The Lord of the Rings Online™ Jun 6, 2012.

By the way, a system call is a function of the kernel invoked by a userspace program and it can be something like writing to a file descriptor, or even exiting. Usually, these are wrapped by C functions in the standard library.

The system calls

First, we need to know what system call we want to make, and what arguments it pretends.

A full list is hosted by Apple here. The header also hints at the fact that they are inherited from BSD. Yeah, that makes sense.

So, to write our proverbial Hello world we will pick the syscall 4

32-bit

Let’s start easy. A cute 32-bit program, written in NASM assembler language. Compile with nasm or yasm, output format MachO, and link with ld.

I’m on a Intel machine, so what we are looking for is the x86 syscall calling conventions for the OS X or BSD platform. They are pretty simple:

arguments passed on the stack, pushed right-to-left
stack 16-bytes aligned
syscall number in the eax register
call by interrupt 0x80

So what we have to do to print a “Hello world” is:

push the length of the string (int) to the stack
push a pointer to the string to the stack
push the stdout file descriptor (1) to the stack
align the stack by moving the stack pointer 4 more bytes (16 - 4 * 3)
set the eax register to the write syscall number (4)
interrupt 0x80

64-bit

64-bit is a bit cleaner, but completely different: OS X (and GNU/Linux and everyone except Windows) on 64 architectures adopt the System V AMD64 ABI reference. Jump to section A.2.1 for the syscall calling convention.

arguments are passed on the registers rdi, rsi, rdx, r10, r8 and r9
syscall number in the rax register
the call is done via the syscall instruction
what OS X contributes to the mix is that you have to add 0x20000000 to the syscall number (still have to figure out why)

So, here is the (IMHO) much more clean 64-bit “Hello world”. Ah, if you want to do this at home and have it actually run, generate a macho64 object with a new version of NASM or with YASM, and link with ld as usual.

6.43 GB

Developer: Infinity Ward

Release date: 2007

Version: 1.7.495 + Full Game

Interface language: Russian, English

Tablet: Not required

Platform: Intel only

To bookmarks

Call of Duty 4: Modern Warfare is a 2007 first-person shooter developed by Infinity Ward and published by Activision. The fourth main installment in the Call of Duty series; the game breaks away from the World War II setting of previous entries in the series and is instead set in modern times. Developed for over two years, the game uses a proprietary game engine.

The story takes place in the year 2011, where a radical leader has executed the president of an unnamed country in the Middle East, and an ultranationalist movement ignites a civil war in Russia. The conflicts are seen from the perspectives of a U.S. Force Reconnaissance Marine and a British SAS commando, and are set in various locales, such as the United Kingdom, the Middle East, Azerbaijan, Russia, and Ukraine. The multiplayer portion of the game features various game modes, and contains a leveling system that allows the player to unlock additional weapons, weapon attachments, and camouflage schemes as they advance. it was released in November 2007 for the PlayStation 3, Xbox 360, and Microsoft Windows, and was ported to the Wii as Call of Duty: Modern Warfare – Reflex Edition in 2009.

The game received universal acclaim from critics, with the gameplay and story receiving particular praise, while criticism targeted the failure of the game to substantially innovate the first-person shooter genre. The game won numerous awards from gaming websites, including IGN's Best Xbox 360 Game. It was the top-selling game worldwide for 2007, selling around seven million copies by January 2008 and almost sixteen million by November 2013. It was followed by two sequels that continue the storyline: Call of Duty: Modern Warfare 2 and Call of Duty: Modern Warfare 3.

A remastered version of Modern Warfare, Call of Duty: Modern Warfare Remastered, was released as part of special edition bundles of Call of Duty: Infinite Warfare in November 2016, and as a standalone game in June 2017. A soft reboot of the Modern Warfare games, Call of Duty: Modern Warfare, was released in October 2019.

Screenshots from the game Call of Duty 4: Modern Warfare