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Xchg instruction syntax error

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MessagePosté le: Jeu 15 Mar - 17:45 (2018)    Sujet du message: Xchg instruction syntax error Répondre en citant

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x86 Assembly. Some of the most important and most frequently used instructions are those that move data. Without them, there would be no way for registers or memory to mov dest, src, Intel syntax Unlike xchg there is not an implicit lock prefix and if the instruction is required to be atomic then lock must be prefixed.
unchanged 0. INTO. No operands. Interrupt 4 if Overflow flag is 1. Algorithm: if OF = 1 then INT 4. Example: ; -5 - 127 = -132 (not in -128..127). ; the result of SUB is wrong (124),. ; so OF = 1 is set: MOV AL, -5. SUB AL, 127 ; AL = 7Ch (124). INTO. ; process error. RET. Interrupt Return. Page 13 of 53. 8086 instructions
29 Apr 2017 mov ebx nr2. Obviously this line needs a comma. Actually the comma could have been included legally in the calling sequence of this macro! That's why the assembler was showing the error on another line. But also : Shouldn't you jump over the et2 block when the et1 block was executed? What's the sense of pushing EAX
The XCHG (exchange data) instruction exchanges the contents of two operands. There are three variants: XCHG reg, reg XCHG reg, mem XCHG mem, reg. You can exchange data between registers or between registers and memory, but not from memory to memory: xchg ax, bx ; Put AX in BX and BX in AX xchg memory,
XCHG <d>, <s>. XLAT. PUSH <s>. POP <d>. Data copying is made with the MOV instruction. The syntax of this is instruction is the one below: MOV {register | memory}, {register | memory | immediate data}. This instruction copies the source operand to the destination. Right after a MOV instruction is executed, the source
AH is the high byte of register AX, and BL is the low byte of BX. MOV and XCHG. The MOV Instruction is used to transfer data. between registers,; Between a register and a memory location,; or to move a number directly into a register or memory location. The syntax is. MOV destination , source. Example: MOV AX , WQRD1.
Instruction Set The MOV instruction is the most important command in the 8086 because it moves data from one location to another. It also has the widest variety of . The source and destination may be either bytes or words but both operands must be the same type or the assembler will generate an error. If the sum of the
register (reg). memory variable (mem) (with displacement). Indirect operands are used for indirect addressing (this will be covered later in Addressing Modes). Note. The following instructions in italics are illegal and will cause the assembler to generate error messages. Instructions that are not in italics are correct syntax.
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