ICS 331: System Software (981)

Homework # 1

Date: October 6, 1998                                                                                                           Due Date: October 18, 1998

Question 1 (3- pp. 114)                                                                                                                       (35 Points)

Question 2 (6- pp. 117):                                                                                                                        (30 Points)

Question 3 (11- pp. 118):                                                                                                                       (15 Points)

After implementing all the features of Section 3.2 the symbol table (SYMTAB) will consists of the following fields:

     Where:

        Name: is the symbol name.

        Type: is either R (Relative) or A (Absolute).

        Block Name: is the Block Name in which the symbol is defined (if USE directive is used).

       Address/Value: is the address of the symbol, or the value if it is not a label of an address.

        Flags: is the flags set by the assembler, such as undefined symbol or external symbol

Question 4 (14- pp. 118):                                                                                                                       (20 Points)

To include the items of the CDATA block in the default block, we need to remove the USE directives in lines 92, 183

and 252.The generated object program will be:

  H^COPY ^000000^001071

  T^000000^1E^172063^4B2021^032060^290000^332006^4B203B^3F2FFE^032055^0F2056^01003

  T^00001E^09^0F2048^4B2029^3E203F

  T^00002D^1D^B410^B400^B440^75101000^E32038^332FFA^DB2032^A004^332008^57A02F^B850

  T^00004A^1D^3B2FEA^13201F^4F0000^F1^B410^772017^E3201B^332FFA^53A016^DF2012^B850

  T^000067^0A^3B2FEF^4F0000^454F46^05

  E^000000