noff.h

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/* noff.h 
 *     Data structures defining the Nachos Object Code Format
 *
 *     Basically, we only know about three types of segments:
 *      code (read-only), initialized data, and unitialized data
 */

#define NOFFMAGIC       0xbadfad        /* magic number denoting Nachos 
                                         * object code file 
                                         */

typedef struct segment {
  int virtualAddr;              /* location of segment in virt addr space */
  int inFileAddr;               /* location of segment in this file */
  int size;                     /* size of segment */
} Segment;

typedef struct noffHeader {
   int noffMagic;               /* should be NOFFMAGIC */
   Segment code;                /* executable code segment */ 
   Segment initData;            /* initialized data segment */
#ifdef RDATA
   Segment readonlyData;        /* read only data */
#endif
   Segment uninitData;          /* uninitialized data segment --
                                 * should be zero'ed before use 
                                 */
} NoffHeader;

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