X64 Registers Cheat Sheet

[Hollie Kipps]

Theunderlying operation performed by this wizard involves generatingthe XML-related mark-up for the Cheat Sheet Contentextension point (org.eclipse.ui.cheatsheets.cheatSheetContent)and adding it to the plugin.xml file belonging to the plug-in projectthe cheat sheet being registered is contained within.

A brief description and problem domain category may be specified for the cheat sheet during registration. This wizard will only register the cheat sheet once.Subsequent uses of this wizard allow the user to update thecheat sheet description and category values of the original registration.

In general, cheat sheets help guide users through complex instructions. There are two types of cheat sheets: simple and composite. Simple cheat sheets are used to organize and present logical steps and sub-steps to achieve a certain task. Composite cheat sheets are used to organize and present tasks represented by simple cheat sheets to achieve a larger goal.

Depending on the complexity of the goal, users may choose to use simple cheat sheets alone or in association with composite cheat sheets. In this document, we will be developing a simple Hello World! example that makes use of simple and composite cheat sheets.

I recently got to work with implementing a Nicla Sense Me into a project here and I have some confusion after trying around with it for a bit.

On -sense-me/cheat-sheet#sensor-ids there is this handy list of the implemented sensor-IDs. However it is missing detail on what the listed individual Sensor outputs actually show/give out.

For example what is the difference between "Any motion", "Any motion wakeup", "Hardware Significant Motion", "Significant Motion", "Motion Detect" ect. I tried reading some of these out, but they all just read "0.00", no matter how much the Niclas is moved around. This makes me think I am missing something.

Is there any more detailed documentation about these Sensor IDs or maybe the "nomenclature" behind them? Not only for the example Sensors, but all listed. I tried googling around, but could not find anything helpful so far.

Sorry if this is something well known, I am still new to the world of Arduinos.

Thank you and have a nice day!

Please see BMI160 datasheet at -sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmi160-ds000.pdf for the definition of Any-motion and Significant motion interrupts. Then you can test these interrupts on Nicla Sense ME board.

This comprehensive ARM Assembly cheat sheet provides a fundamental overview of ARM assembly programming, including registers, update modes, and memory addressing, as well as a detailed list of essential ARM instructions such as arithmetic, branching, bitwise logic, comparison, data movement, and memory access operations. It serves as a quick reference for beginners and seasoned programmers alike, offering insights into the basics of ARM architecture and instruction set to facilitate data manipulation, function management, and efficient memory handling.The BasicsRegisters (reg)In ARM assembly language, registers are denoted by reg and can refer to any of the general-purpose registers or specific system registers. Here is the explanation of the register naming conventions:

These modes determine how the base register's value is adjusted in relation to the data block being loaded or stored, allowing for efficient memory access patterns, especially in looping constructs or when managing arrays and buffers.

You will find various kinds of moves (MOV, CMOV, XCHG), arithmetical (ADD, SUB, MUL, DIV) and logical (AND, OR, XOR, NOT) instructions here. Several charts illustrate shifts (SHL/SHR, ROL/ROR, RCL/RCR) and stack frames. Code samples for typical high-level language constructs (if conditions, while and for loops, switches, function calls) are shown. Also included are quick references for RDTSC and CPUID instructions, description of string operations such as REP MOVSB, some code patterns for branchless conditions, a list of registers that should be saved in functions, and a lot of other useful stuff.

The cheat sheet use common notation for operands: reg means register, [mem] means memory location, and imm is an immediate operand. Also, x, y, and z denote the first, the second, and the third operand. Instruction mnemonics are written in capital letters to make them easier to find when you are skipping through the cheat sheet.

For example, let's look at multiplication and division section. There are instructions for signed (IMUL) and unsigned (MUL) multiplication. Both instructions take one operand, which may be register (reg) or memory ([mem]). There are three possible cases:

The cheat sheet is designed for A4 page size; if you print it on US Letter paper, you will get large margins. You can print the cheat sheet and put it on your table to look for some instructions when you forget them.

Exclusive British infosec accreditation body CREST has changed some of its exams after cheat sheets containing exam answers and practical walkthroughs were posted on GitHub in a repo that NCC Group confirmed included its own documents.

In an email to all CREST members sent on the afternoon of 12 August, the certification body assured members that leaked elements of its certification exams have now been "deprecated" as part of a process already in motion "between June 2018 and July 2020".

The move comes after El Reg revealed that NCC Group-branded sheets had been posted to GitHub, prompting group CISO Dominic Beecher to comment on the repo and ask for the "proprietary and confidential information" to be taken down.

With its latest update, CREST has confirmed that at least some of the exam material posted to GitHub was in current use, at least until CREST became aware of what was going on. Exam sittings had been postponed because of the COVID-19 pandemic and exam centres were only due to reopen over the last couple of days, as a CREST update dated 3 July explained.

Many people contacted The Register after we revealed the GitHub postings. All of them questioned how seriously CREST would take the breach and whether the body would enforce its customary non-disclosure agreement (NDA) against NCC, which prohibits the disclosure of exam content.

It is unclear whether NCC's apparent retention of notes about the exams falls within the CREST non-disclosure agreement. A copy of the NDA shown to El Reg says information from CREST exams must be "protected from disclosure to anyone outside of the CREST Assessors, the CREST Executive (defined as the governing body of CREST) or CREST permanent staff".

We understand CREST exam candidates are urged "not to act deceptively or dishonestly during an examination". They are also obliged to "report to CREST any instances of deceptive or dishonest behaviour during or related to CREST examinations".

In its statement, CREST said it "will be appointing an independent investigative panel to assess a number of different aspects of the case including the extent to which NCC were aware, or should have been aware, of the content of their training material".

Exam candidates working for NCC were urged to sign up for internal pre-exam preparation courses. During those courses they were shown testing rigs with vulnerabilities to tackle and given multiple choice questions to answer, just as in the real CREST registered pentester (CRT) exam. Supporting materials given to exam candidates also included what appeared to be marked exam papers and detailed walkthroughs of pentesting scenarios. Documents leaked on GitHub claimed these courses could be booked through employees' line managers.

"The training session is basically a primer on everything that's needed to pass," said one source, Alice. "The trainer will say things like, 'This is included in the exam and the way it works is this.' When I took my exam the long form questions I got [in the training session] were the same as the ones in the exam."

Real CREST exams administered by NCC, alleged our sources, contained questions and scenarios they had practised beforehand in detail in the pre-exam "training" session. Another person, Bob, told us: "I recall there was some variation but very little. The majority of the questions were very similar."

Others said there were parts to their exams that they had not seen in full detail beforehand. A source we will name as Craig commented: "So the labs weren't exactly the same. It's more like a CREST question might have 4 to 6 main steps, and these would be separated out between several lab boxes."

"The content of the exams and syllabus is intentionally extremely vague and under heavy NDA," said a fifth source who we will refer to as Eve. "NCC having access to this kind of information completely undermines the purpose of CREST, in my humble opinion."

In a statement emailed to its members and to The Register, CREST said it was taking action to investigate the breach. We understand that a group of CREST assessors is running the investigation and that none of those people work for NCC.

"NCC are co-operating fully with CREST," said the company. "CREST takes breaches of its non-disclosure agreements very seriously and expects high standards of ethical behaviour from both its member companies and those holding CREST qualifications. CREST will take appropriate action once its investigation has been completed."

A spokesperson from the National Cyber Security Centre (NCSC), the cyber offshoot of UK signals intelligence agency GCHQ, told The Register: "We are aware of these allegations and are working with CREST and the NCC Group to understand their validity, as well as undertaking our own investigation into any potential implications.

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