TAILIEUCHUNG - Cracker Handbook 1.0 part 43

Tham khảo tài liệu 'cracker handbook part 43', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | subtract sub to multiply mul and to divide div. Almost all the comparison instructions are based on the information contained in the flag register. Normally the flags of this register which can be directly handled by the programmer are the data direction flag DF used to define the operations about chains. Another one which can also be handled is the IF flag by means of the sti and cli instructions to activate and deactivate the interruptions. Jumps loops and procedures The unconditional jumps in a written program in assembler language are given by the jmp instruction a jump is to moves the flow of the execution of a program by sending the control to the indicated address. A loop known also as iteration is the repetition of a process a certain number of times until a condition is fulfilled. These loops are used 4 Assembler language Instructions Table of Contents Transfer instructions Loading instructions Stack instructions Logic instructions Arithmetic instructions Jump instructions Instructions for cycles loop Counting Instructions Comparison Instructions Flag Instructions Transfer instructions They are used to move the contents of the operators. Each instruction can be used with different modes of addressing. MOV MOVS MOVSB MOVSW MOV INSTRUCTION Purpose Data transfer between memory cells registers and the accumulator. Syntax MOV Destiny Source Where Destiny is the place where the data will be moved and Source is the place where the data is. The different movements of data allowed for this instruction are Destiny memory. Source accumulator Destiny accumulator. Source memory Destiny segment register. Source memory register Destiny memory register. Source segment register Destiny register. Source register Destiny register. Source memory Destiny memory. Source register Destiny register. Source immediate data Destiny memory. Source immediate data Example MOV AX 0006h MOV BX AX MOV AX 4C00h INT 21H This small program .

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