unconditional “jump” instructions for if-else branching or Jump instruction is similar to “call” instruction, Example test in signed character (1 byte) arithmetic:
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[PDF] Conditional Jump Ex: Write a piece of code that transfers a block of
JE : Jump Equal JZ : Jump Zero ZF = 1 JE : Jump Equal ≠ JNZ : Jump Not Zero JNE : Jump Not Equal ZF = 0 JNZ : Jump Not Zero > JA : Jump above CF = 0 and ZF = 0 < JB : Jump Below CF = 1 JL : Jump Less ≥ JAE : Jump Above or Equal CF = 0 JGE : Jump Greater or ≤ JBE : Jump Below or Equal CF = 1 or ZF = 1
[PDF] Conditional Jumps Instructions
Conditional jump instructions can be divided into four groups: 3 Jumps Example 7: Jump to label L1 if unsigned EAX is less than or equal to Val1 cmp eax,
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Example: ALFA: JMP ALFA If the distance to the label is under 126 bytes and has been defined before the jump instruction, than a short jump type is encoded
[PDF] x86 Assembly Jump Instruction
segment (FAR) By default, it is assumed that the destination is NEAR unless the assembler can compute that the jump can be short • Examples: jmp near ptr L1
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second operand (as set by CMP instruction) Unsigned Algorithm: if CF = 0 then jump Example: include 'emu8086 inc' ORG 100h MOV AL, 5 CMP AL, 5
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unconditional “jump” instructions for if-else branching or Jump instruction is similar to “call” instruction, Example test in signed character (1 byte) arithmetic:
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the jump address within the current code segment 1 byte 1 byte Example: JMP 04H The conditional jump instructions are always short jump in 8086
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Data Types and Data Definition Page 2 8086 EENG410: MICROPROCESSORS I Control transfer instructions • FAR and NEAR : (given A conditional jump is a two-byte instruction: one byte is the opcode of the J condition and the second
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Example ➢AAA Instruction: AAA converts the result of the addition of two valid unpacked When 8086 executes the near CALL instruction it decrements the stack pointer by This instruction performs the Jump if above (or) Jump if not below
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Let's take an example:- PC Mnemonic, Operand Opcode (Machine code) 0000 ORG 0H 0000 MOV R0, #0 7800 0002 MOV A, #55H 7455 0004 JZ NEXT
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