6800 assembly language programming by Lance A Leventhal

By Lance A Leventhal

Ebook through Leventhal, Lance A

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The Functions of a Symbolic Assembler As we have said, the VAX assembler performs the clerical task of translating the symbolic assembly language program into the binary machine language program. To translate a symbolic assembly program, the assembler performs the following functions: 42 The Program Assembler and Debugger 1. It generates a symbol table that contains the values of all user-defined labels and symbols. 2. It maintains a location counter that tells where the next instruction or data item will be placed in memory.

We can specify the locations of the operands to be added by their addresses. For instance, the instruction ADDL 2 0 0 , 2 0 4 causes the longword stored at location 200 to be added to the longword stored at location 204. The result for the two-operand arithmetic instructions is always stored at the second operand address. That is, the contents of location 204 are modified by this instruction. Suppose memory locations 200 and 204 contain the following values before the execution of the ADDL instruction: Address 200 204 208 Contents 1765 23 152 Following the execution of ADDL 200,204 instruction, the contents of the memory will appear as follows: Address 200 204 208 Contents 1765 1788 152 The VAX also allows three-operand forms of most arithmetic operations.

40 The Program Assembler and Debugger To understand how instructions operate, examine a simple longword Add instruction that sums two 32-bit longword integers in memory. We can specify the locations of the operands to be added by their addresses. For instance, the instruction ADDL 2 0 0 , 2 0 4 causes the longword stored at location 200 to be added to the longword stored at location 204. The result for the two-operand arithmetic instructions is always stored at the second operand address. That is, the contents of location 204 are modified by this instruction.

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