Deutsche Edition 1/Deutsche Edition 1.iso/amok/051-060/amok58/sysdis/sysdis.mod

Text File | 1993-11-04 | 5KB | 201 lines

(*---------------------------------------------------------------------------
  :Program.     SysDis.mod
  :Contents.    Disassembler für die System-Routinen
  :Author.      Christian Stiens
  :Address.     Heustiege 2, W-4710 Lüdinghausen
  :Copyright.   PD
  :Language.    Oberon
  :Translator.  Amiga Oberon V2.09 [fbs]
  :History.     V1.0, 23-Aug-91
  :Imports.     MyArguments, DisAss
---------------------------------------------------------------------------*)

MODULE SysDis;

  IMPORT
    io,Break,
    c   : Conversions,
    arg : MyArguments, (* kompatibel zu Arguments, erlaubt bei WB-Start die
                          Eingabe der Argumente über Tastatur.
                          Liegt aus rechtlichen Gründen nicht bei *)
    da  : DisAss,
    d   : Dos,
    e   : Exec,
    st  : Strings,
    sys : SYSTEM;

  CONST
    error    = 0;
    library  = 1;
    device   = 2;
    resource = 3;

    usage = "Usage: SysDis <lib|dev|resourcename> <offset> [<numlines>]\n   or: SysDis <adr> [<numlines>]\n";

  VAR
    ioreq : e.IOStdReq;
    name  : ARRAY 80 OF CHAR;
    str   : ARRAY 80 OF CHAR;
    lib   : e.LibraryPtr;
    ptr   : POINTER TO STRUCT jmp:INTEGER; adr:LONGINT END;
    offs  : LONGINT;
    lines : LONGINT;
    size  : INTEGER;
    type  : INTEGER;
    adr   : e.ADDRESS;
    line  : da.Line;
    unit  : LONGINT;

  PROCEDURE GetType(VAR str: ARRAY OF CHAR): INTEGER;
    VAR point : INTEGER;
        str2  : ARRAY 80 OF CHAR;
  BEGIN
    IF str[0] = 0X THEN RETURN error END;
    point := st.Occurs(str,".");
    IF point < 0 THEN
      st.Append(str,".library");
    END;
    point := st.Occurs(str,".");
    IF point < 0 THEN RETURN error END;
    st.Cut(str,point+1,st.Length(str)-point,str2);
    IF    str2 =  "library" THEN RETURN library
    ELSIF str2 =   "device" THEN RETURN device
    ELSIF str2 = "resource" THEN RETURN resource
    END;
    RETURN error;
  END GetType;

  PROCEDURE Usage;
  BEGIN
    io.closeDelay := 150;
    io.WriteString(usage);
    HALT(0)
  END Usage;

BEGIN

  lib := NIL;
  IF arg.NumArgs() = 0 THEN Usage END;
  arg.GetArg(1,str);
  IF str[0] = "?" THEN Usage END;

  IF c.StringToInt(str,adr) THEN

    IF arg.NumArgs() > 1 THEN
      arg.GetArg(2,str);
      IF ~c.StringToInt(str,lines) THEN Usage END;
    ELSE
      lines := -1;
    END;

  ELSE

    IF arg.NumArgs() < 2 THEN Usage END;
    arg.GetArg(1,name);
    type := GetType(name);

    IF type = error THEN
      io.WriteString("Wrong name\n");
      HALT(0)
    END;

    CASE type OF
    | library:
      lib := e.OpenLibrary(name,0);
    | device:
      unit := 0;
      IF st.Occurs(name,"console") = 0 THEN unit := -1 END;
      IF e.OpenDevice(name,unit,sys.ADR(ioreq),LONGSET{})=0 THEN
        lib := sys.VAL(LONGINT,ioreq.device);
      ELSE
        lib := NIL
      END;
    | resource:
      lib := e.OpenResource(name);
    END;

    IF lib = NIL THEN
      io.WriteString("Can't open "); io.WriteString(name); io.WriteLn;
      HALT(0)
    END;

    size := lib.negSize;

    arg.GetArg(2,str);
    IF ~c.StringToInt(str,offs) THEN Usage END;

    IF arg.NumArgs() > 2 THEN
      arg.GetArg(3,str);
      IF ~c.StringToInt(str,lines) THEN Usage END;
    ELSE
      lines := -1;
    END;

    io.WriteString(name); io.WriteString(" found at ");
    io.WriteHex(lib,8); io.WriteString("H.\n");

    offs := offs DIV 6 * 6;

    IF (offs < -size) OR (offs > -6) THEN
      io.WriteString("Offset out of Range\n");
      HALT(0)
    END;

    ptr := sys.VAL(LONGINT,lib) + offs;

    IF ptr.jmp # 04EF9H THEN
      io.WriteString("I'm confused with the jump-table\n");
      HALT(0);
    END;

    adr := ptr.adr;

    io.WriteString("Routine with offset ");
    io.WriteInt(offs,1); io.WriteString(" lies at address ");
    io.WriteHex(adr,8); io.WriteString("H.\n\n");

  END(*IF*);

  IF lines < 0 THEN
    IF ~d.IsInteractive(d.Input()) OR ~d.IsInteractive(d.Output()) THEN
      lines := 100
    END;
  END;

  IF lines >= 0 THEN
    WHILE lines > 0 DO
      Break.CheckBreak;
      adr := da.Disass(line,adr,0);
      io.WriteString(line.s); io.WriteLn;
      DEC(lines);
    END;
  ELSE
    REPEAT
      lines := 20; WHILE lines > 0 DO
        Break.CheckBreak;
        adr := da.Disass(line,adr,0);
        io.WriteString(line.s); io.WriteLn;
        DEC(lines);
      END;
      io.WriteString("-- More? ");
      io.ReadString(str);
      io.WriteString("\x0B\r");
    UNTIL (CAP(str[0])="N") OR (CAP(str[0])="X") OR (CAP(str[0])="Q");
  END;

CLOSE

  IF lib # NIL THEN
    CASE type OF
      library: e.CloseLibrary(lib) |
      device:  e.CloseDevice(sys.ADR(ioreq))
    ELSE
    END;
  END;

  io.WriteString("\[3mCiao Amigos!\[0m\n");

END SysDis.