Cracker Handbook 1.0 part 58 ppsx

The jump occurs if ZF = 0 or if OF = SF. JGE (JNL) INSTRUCTION Purpose: Conditional jump, and the sign is taken into account. Syntax: JGE label It jumps if it is larger or less than, or equal to. The jump is done if SF = OF JL (JNGE) INSTRUCTION Purpose: Conditional jump, and the sign is taken into account. Syntax: JL label It jumps if it is less than or if it is not larger than or equal to. The jump is done if SF is different than OF. JLE (JNG) INSTRUCTION Purpose: Conditional jump, and the sign is taken into account. Syntax: JLE label It jumps if it is less than or equal to, or if it is not larger. The jump is done if ZF = 1 or if SF is defferent than OF. JC INSTRUCTION Purpose: Conditional jump, and the flags are taken into account. Syntax: JC label It jumps if there is cartage. The jump is done if CF = 1 JNC INSTRUCTION Purpose: Conditional jump, and the state of the flags is taken into account. Syntax: JNC label It jumps if there is no cartage. The jump is done if CF = 0. JNO INSTRUCTION Purpose: Conditional jump, and the state of the flags is taken into account. Syntax: JNO label It jumps if there is no overflow. The jump is done if OF = 0. JNP (JPO) INSTRUCTION Purpose: Conditional jump, and the state of the flags is taken into account. Syntax: JNP label It jumps if there is no parity or if the parity is uneven. The jump is done if PF = 0. JNS INSTRUCTION Purpose: Conditional jump, and the state of the flags is taken into account. Syntax: JNP label It jumps if the sign is deactivated. The jump is done if SF = 0. JO INSTRUCTION Purpose: Conditional jump, and the state of the flags is taken into account. Syntax: JO label It jumps if there is overflow. The jump is done if OF = 1. JP (JPE) INSTRUCTION Purpose: Conditional jump, the state of the flags is taken into account. Syntax: JP label It jumps if there is parity or if the parity is even. The jump is done if PF = 1. JS INSTRUCTION Purpose: Conditional jump, and the state of the flags is taken into account. Syntax: JS label It jumps if the sign is on. The jump is done if SF = 1. 4.7 Instructions for cycles:loop They transfer the process flow, conditionally or unconditionally, to a destiny, repeating this action until the counter is zero. LOOP LOOPE LOOPNE LOOP INSTRUCTION Purpose: To generate a cycle in the program. Syntax: LOOP label The loop instruction decreases CX on 1, and transfers the flow of the program to the label given as operator if CX is different than 1. LOOPE INSTRUCTION Purpose: To generate a cycle in the program considering the state of ZF. Syntax: LOOPE label This instruction decreases CX by 1. If CX is different to zero and ZF is equal to 1, then the flow of the program is transferred to the label indicated as operator. LOOPNE INSTRUCTION Purpose: To generate a cycle in the program, considering the state of ZF. Syntax: LOOPNE label This instruction decreases one from CX and transfers the flow of the program only if ZF is different to 0. . 1 JNC INSTRUCTION Purpose: Conditional jump, and the state of the flags is taken into account. Syntax: JNC label It jumps if there is no cartage. The jump is done if CF = 0. . PF = 1. JS INSTRUCTION Purpose: Conditional jump, and the state of the flags is taken into account. Syntax: JS label It jumps if the sign is on. The jump is done if SF = 1. . LOOP label The loop instruction decreases CX on 1, and transfers the flow of the program to the label given as operator if CX is different than 1. LOOPE INSTRUCTION Purpose: To generate