[考古] 系統程式/黃志銘/95下期末考

[XX9 ( 佛曰: ....)]

※ [本文轉錄自 FCU_Talk 看板]

作者: kilonbia (專題~"~) 看板: FCU_Talk
標題: [考題] [資訊系-系統程式][黃志銘][95下期末考]
時間: Sun Jul  8 19:33:07 2007

                         [系統程式][黃志銘][期末考]

[壹]、Please describe the detail correlations between assembler, macro
      processor and loader. 15%

[貳]、What is the differece between linking loader, linkage editor, and
      dynamic linking? 15%

[參]、What is the most important differece between a macro and a subroutine?
      How should a programmer decide whether to use a macro or a subroutine to
      accomplish a given logical function? 10%

[肆]、Consider a two-pass assembler, a two-pass linking loader, and a two-pass
      macro processor describes in the textbook. Indeitfy the passes of the
      assembler, the loader, or the macro processor where each of the
      following task would be done. 20%

      (A) Assembler   (L) Linking Loader   (M) Macro Processor
      (1) Pass-1      (2) Pass-2

      Please show your answer as A2 if the specific task is processed in
      Assembler Pass-2 or as M1 if the specific task is processed in Macro
      processor Pass-1 or like that.

      (a) Assign relative addresses to symbols defined as labels in the
          program.
      (b) Load the object program into memeory.
      (c) Assign actual addresses to program modules.
      (d) Detect doubly-defined entry points (the same external symbol defined
          by two different control sections).
      (e) Modify the relocatable portion of the object code.
      (f) Enter adderss for external symbols into external symbols table.
      (g) Generate values defined in data initialization statements such as
          WORD and BYTE.
      (h) Process EQU assembler directives.
      (i) Process macro definition.
      (j) Macro invocation process.

[伍]、Apply and expand the following two macro invocation statements to
      following macro definition: 20%

      (1)       RDBUFF F1,BUFFER,LENGTH,(04,12)
      (2) LABEL RDBUFF F1,BUFFER,LENGTH,00

      Macro definition:

      25 RDBUFF  MACRO  &INDEV,&BUFADR,&RECLTH,&EOR
      27 &EORCT  SET    %NITEMS(&EOR)
      30         CLEAR  X
      35         CLEAR  A
      45         +LDT   #4096
      50 $LOOP   TD     =X'&INDEV'
      55         JEQ    $LOOP
      60         RD     =X'&INDEV'
      63 &CTR    SET    1
      64         WHILE  (&CTR LE &EORCT)
      65         COMP   =X'0000&EOR[&CTR]'
      70         JEQ    $EXIT
      71 &CTR    SET    &CTR+1
      73         ENDW
      75         STCH   &BUFADR,X
      80         TIXR   T
      85         JLT    $LOOP
      90 $EXIT   STX    &RECLTH
     100         MEND

[陸]、Suppose that the following macro definitions appeared at the beginning
      of a SIC/XE program. 20%

      (1) Show the contents of NAMTAB and DEFTAB jast after this code is
          scanned by the macro processor. (Pointer values are given as line
          number into DEFTAB)
      (2) Now suppose that right after these definitions, the macro processor
          scans a line that says : MACROS
      Show the contents of NAMTAB and DEFTAB now.

      1   MACROS    MACOR
      2   RDBUFF    MACOR   &INDEV,&BUFADR,&RECLTH
      3             LDS     &BUFADR
      4             MEND
      5   WRBUFF    MACRO   &OUTDEV,&BUFADR,&RECLTH
      6             LDS     &BUFADR
      7             MEND
      8             MEND
      9   MACROX    MACOR
     10   RDBUFF    MACOR   &INDEV,&BUFADR,&RECLTH
     11             LDT     &BUFADR
     12             MEND
     13   WRBUFF    MACRO   &OUTDEV,&BUFADR,&RECLTH
     14             LDT     &BUFADR
     15             MEND
     16             MEND

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