best way to study for security exam

the representation and processing of the information in the 2nd Chapter(i), three kinds of important digital representationsUnsigned number: The encoding is based on the traditional binary notation (numbers greater than or equal to zero).Complement: Encoding is the most common way to represent signed integers (numbers that are positive or negative).Floating-point number: The encoding is a two-base version of the scientific notation for real numbers.Al

Number of lines of code (Add/accumulate) Blog volume (New/accumulated) Learning time (Add/accumulate) Important Growth Target 3000 rows 30 articles 300 hours WEEK 1 0/0 1/2 25/40 I learned basic Linux knowledge and core commands Week 2 0/0 0/2 0/40 Week 3 300/300 3/5 40/80 Learned vim, GCC, and gdb commands;Learned Information Representation and Processing Week 5 200/500

他三种方式产生实际值的确界。P28 Code and operationSecond, the problems encountered and how to solveThis week's course is mainly the reading and comprehension of textbooks, and the proportion of experiments is small.With regard to the application of bit patterns, it was doubtful at first that the concept of coercion was not clear. After further understanding, you slowly begin to understand the actual concept of coercion. It is known that coercion type conversions cannot be transferred arbitrarily.This week, we

address addressing, relative base address addressing, proportional addressing mode, base address proportional address mode, and relative base address proportional addressing modeV. directivesmov--transmitting dataadd--Plussub--minusimul--Multiply (signed)xor--XORor--orand--andleal--delivery addressinc--Plus Onedec--minus Oneneg--take negative?not--to take the supplement?Sal (SHL)--shift leftsar--Arithmetic Right Shiftshr--Logical Right Shiftloop--CycleJump instruction: SlightlySix, the flag bit

/12 20/200 Learn the contents of system level I/O and understand the intrinsic function Tenth Week 407/1035 1/13 30/230 Analyze and debug your code, system-level I/O content 11th Week 714/1749 2/15 40/270 Understanding anomalies and their types 12th Week 0/1749 4/19 30/300 Review the contents of the previous weeks 13th Week 797/2728 2/21 20/320 Learn t

. Garbage collectionvoid Garbage (){int *p = (int *) Malloc (15213)Return}garbage collector:is a dynamic storage allocator that automatically frees allocated blocks that are no longer needed by the program. These blocks are called garbage. The process of automatically reclaiming heap storage is called garbage collection. The following functions are used in the description of Marksweep: where PTR is defined as typedef void *PTRPtrisptr (PTR p): if p points to a word in an allocated block, it ret

implements a finite integer operation compared to a real integer operation, with some special properties: because of overflow, the expression x*x can produce negative numbers. However, both unsigned and complement operations satisfy many of the other properties of integer operations, including binding laws, commutative laws, and distributive laws. This allows the compiler to do a lot of optimizations. We've seen several clever ways to use bit-level arithmetic and arithmetic operations: (1) us

code to compile the installationTo install the Deb package from a local disk using dpkg:First use the Apt-get plus-d parameter only download not installed, download the Emacs Editor's Deb package, after the download is complete,We can view the contents of the/var/cache/apt/archives/directory, we will copy the first deb to the home directory and use dpkg to installTo view the installation directory for installed packages:Using Dpkg-l to view the Deb package directory informationTo install from a

RET instruction pops the address from the stack and jumps to that position.3.7.3 Register Usage ConventionsYou must guarantee that when a caller invokes the callee, the callee does not overwrite the value of a register that the caller will later use.Two ways to achieve the above requirements:• Before calling Q, the value of y is stored in its own stack frame, and when Q returns, process P can remove the value of y from the stack, that is, the caller holds the value of Y.• Save the value of Y in

not many, mainly is mastering the process and its control function use, the signal sends the function, the reception function and the processing function. The most rewarding part of the learning process in this chapter is the understanding of the general concept of the process, which is learning the process scheduling mechanism recently, allowing me to supplement the vacancy on the process.Resources:"In-depth understanding of computer Systems" Chapter 8th, chapter 10th I/O redirectionPipe pipe:

overlap. If one of the execution trajectories happens to reach the deadlock state D then there is no further progress, since overlapping blocks block progress in each legal direction. In other words, the program is deadlocked because each thread waits for a V operation that is not possible at all.Deadlock is a rather difficult problem because it is not always predictable. Some lucky lines of execution will bypass the deadlock area, while others will fall into the area.20135210 Ellis--The basic

128 pages of reference books4. Translation Conditions BranchThe most common method of translating conditional expressions and statements from C to machine code combines conditional and unconditional jumps 5. Circulationthe assembly cycle can be combined with conditional tests and jumps to achieve6. Conditional Delivery InstructionsThe traditional way to implement conditional operations is to take advantage of controlled conditional shifts. Control t

process.The multithreaded execution model is similar in some ways to a multi-process execution model.Each process starts its life cycle as a single thread, which is the main thread. At some point, the main thread creates a peer thread, starting at this point in time, and two threads are running concurrently with each other.A POSIX thread is a standard interface for processing threads in a C program.To terminate a process:1. When the thread routine of the when top layer returns, the line Cheng t

autowrite(aw) set AutoArchive, default not open Enter or in command line :set background=dark mode light , set the background style Command line mode input :set backup(bk) set automatic backup, default not open Command line mode input : set cindent(cin) set C language style indent 3.Linux System Programming(1) Use of GCCcompiler use of GCC Second, the problems encountered and sentiment:Early groping vim time with too much, followed the tutorial done two times, think some instru

values③ floating-Point arithmetic: addition: does not have the binding law, satisfies the monotonicityFloating-point numbers for ④c languages: float, doubleProblems encountered:There are some areas where the overflow is not clear.Do not know abelian group is the Exchange group, forgotten the concept of exchange group and nature, through Baidu re-familiar with the previous knowledge.The operator is not familiar with the formula, do not know whether the need for memory, hope that in the future wi

any timing or control. This is a reasonable assumption for smaller memory (such as a register file), and for larger circuits, a special clock circuit can be used to simulate this effect. Since instruction memory is used only for reading instructions, we can consider this unit as a combinatorial logic.4 Implementation of the SEQ phaseThe register file has four ports, it supports simultaneous two reads (on ports A and B) and two writes (on Ports E and M). Each port has an address connection and a

expressed in the desired floating-point form.1. Rounding to even numbersRounds a number up or down so that the lowest effective number of the result is even.2. Rounding to 03. Rounding up4. Rounding Down34 you can see the upper bound.Rounding to even gets the closest match.4. Floating-point arithmeticFloating-point addition: exchangeable, non-associative, satisfying monotonicityFloating-point multiplication: exchangeable, non-associative, non-assignable, satisfies the following monotonicityFloa

, can be divided into three cases: condition One: Normalized value (when the Order field is not all 0 or(3) Rounding of floating-point numbersThere are four scenarios: rounding to even numbers (default), rounding to 0, rounding down, rounding up.(4) floating point arithmeticFloating-point addition: does not satisfy the binding, satisfies the monotonic floating-point multiplication: does not satisfy the binding, satisfies the monotonicity, does not satisfy the distributive in the additionAll is 1

between the WEB client and the server is a text-based application-level protocol called HTTP (hypertext Transfer Protocol, Hypertext Transfer Protocol). HTTP is a simple protocol. A WEB client (that is, a browser) opens an Internet connection to the server and requests some content. The server responds to the requested content, and then closes the connection. The browser reads the content and displays it on the screen.2. Web ContentEach content returned by the WEB server is associated with a fi

manipulating processes:STRACE：打印一个正在运行的程序和它的子进程调用的每个系统调用的轨迹。对于好奇的的工具。用-StatiC编译你的程序，能传到一个更干净的、不带学生而言，这是一个令人着迷有大量与共享库相关的输出的轨迹。PS：列出当前系统中的进程（包括僵死进程）TOP：打印出关于当前进程资源使用的信息。PMAP：显示进程的存储器映射。proc:一个虚拟文件系统，以ASCII文本格式输出大量内核数数据结构的内容，用户程序可 cat 2 / proc / load avg” , 观察在Linux系统上的平均负载。SummarizeThis week to learn more content, the front also read more understand, behind some chaos, I hope the teacher in class to talk about non-local jump knowledge, I still do not understand here.ResourcesTextbook: "In-depth u