TAILIEUCHUNG - Cracker Handbook 1.0 part 57

Tham khảo tài liệu 'cracker handbook part 57', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | IDIV source It basically consists on the same as the DIV instruction and the only difference is that this one performs the operation with sign. For its results it used the same registers as the DIV instruction. MUL INSTRUCTION Purpose Multiplication with sign. Syntax MUL source The assembler assumes that the multiplicand will be of the same size as the multiplier therefore it multiplies the value stored on the register given as operator by the one found to be contained in AH if the multiplier is 8 bits or by AX if the multiplier is 16 bits. When a multiplication is done with 8 bit values the result is stored on the AX register and when the multiplication is with 16 bit values the result is stored on the even DX AX register. IMUL INSTRUCTION Purpose Multiplication of two whole numbers with sign. Syntax IMUL source This command does the same as the one before only that this one does take into account the signs of the numbers being multiplied. The results are kept in the same registers that the MOV instruction uses. SBB INSTRUCTION Purpose Subtraction with cartage. Syntax SBB destiny source This instruction subtracts the operators and subtracts one to the result if CF is activated. The source operator is always subtracted from the destiny. This kind of subtraction is used when one is working with 32 bits quantities. SUB INSTRUCTION Purpose Subtraction. Syntax SUB destiny source It subtracts the source operator from the destiny. Jump instructions Instructions for cycles loop Counting Instructions Comparison Instructions Flag Instructions Jump instructions They are used to transfer the flow of the process to the indicated operator. JMP JA JNBE JAE JNBE JB JNAE JBE JNA JE JZ JNE JNZ JG JNLE JGE JNL JL JNGE JLE JNG JC JNC JNO JNP JPO JNS JO JP JPE JS JMP INSTRUCTION Purpose Unconditional jump. Syntax JMP .

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