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把汇编语言规定的保留字作标识符使用. 17. Forward reference illegal. 非法的向前引用.在第一遍扫描期间,引用一个未定义符号. 18. Operand must be register. 操作数位置上应是寄存器,但出现了标识符.
In an assembly language program, a label is simply a name for an address. For example, given the declarations shown in Example 2.1, ``x'' is a name for the address of a memory location that was initialized to 23.On the SPARC an address is a 32-bit value. Figure 3 shows the organization of a 64-word register stack. The stack pointer register SP contains a binary number whose value is equal to the address of the word that is currently on top of the stack. Three items are placed in the stack: A, B, and C, in that order. Item C … 2014-11-26 Salient Features of 80386DX 1. The 80386DX is a processor that supports a) 8-bit data operand b) 16-bit data operand c) 32-bit data operand d) all of the mentioned Answer: d Explanation: The 80386DX is a 32-bit processor that supports, 8-bit/16-bit/32-bit data operands.
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The MOVZX instruction can use a variable as the destination operand. a.
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Here, the first source operand (which can be a general-purpose register or a memory location) is multiplied by the second source operand (an immediate value). Problem-06: Consider a three word machine instruction-. ADD A [R 0 ], @B. The first operand (destination) “A [R 0 ]” uses indexed addressing mode with R 0 as the index register. The second operand operand (source) “@B” uses indirect addressing mode. The first operand is a 16-bit word register or memory variable that contains the value of a selector. The second operand is a word register.
Use --cpu=list to list the supported processors and architectures.
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Like BX is allowed to. hold an address but BL or BH The first word at the effective address is assigned the LIMIT field of the register.
Use --cpu=list to list the supported processors and architectures. Here, the first source operand (which can be a general-purpose register or a memory location) is multiplied by the second source operand (an immediate value). The intermediate product (twice the size of the first source operand) is truncated and stored in the destination operand (a general-purpose register). 80.
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They make use of only one operand, and, by convention, have their Rn field set to “0000”. MOV R0,R3 MOV R1,#4096 MVN R2,R4 MVNS R3,#1 3 … 2013-01-19 It decrements the stack pointer by two and then stores the data from the source operand at the position of the stack pointer. The source operand can be a general-purpose register, segment register or a memory address but it should be a word.
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Indirect operands are specified by prefixing the operand with an asterisk (*) (ASCII 0x2A). REX prefixes are used to generate 64-bit operand sizes or to reference registers R8-R15. In 64-bit mode, there are limitations on accessing byte registers. An instruction cannot reference legacy high-bytes (for example: AH, BH, CH, DH) and one of the new byte registers at the same time (for example: the low byte of the RAX register). 2019-01-21 · Register indexed with short displacement: The address is the sum of the values of two registers plus a signed 8-bit immediate. MOV WORD PTR [eax+ebx+12h], 0 ; *(int16_t*)(eax+ebx+0x12) = 0 Register indexed with long displacement: The address is the sum of the values of two registers plus a signed 32-bit immediate.