FreeBSD/Linux Kernel Cross Reference
sys/include/a.out.h

     /* The <a.out> header file describes the format of executable files. */
     
     #ifndef _AOUT_H
     #define _AOUT_H
     
     struct  exec {                  /* a.out header */
       unsigned char a_magic[2];     /* magic number */
       unsigned char a_flags;        /* flags, see below */
       unsigned char a_cpu;          /* cpu id */
      unsigned char a_hdrlen;       /* length of header */
      unsigned char a_unused;       /* reserved for future use */
      unsigned short a_version;     /* version stamp (not used at present) */
      long          a_text;         /* size of text segement in bytes */
      long          a_data;         /* size of data segment in bytes */
      long          a_bss;          /* size of bss segment in bytes */
      long          a_entry;        /* entry point */
      long          a_total;        /* total memory allocated */
      long          a_syms;         /* size of symbol table */
    
      /* SHORT FORM ENDS HERE */
      long          a_trsize;       /* text relocation size */
      long          a_drsize;       /* data relocation size */
      long          a_tbase;        /* text relocation base */
      long          a_dbase;        /* data relocation base */
    };
    
    #define A_MAGIC0      (unsigned char) 0x01
    #define A_MAGIC1      (unsigned char) 0x03
    #define BADMAG(X)     ((X).a_magic[0] != A_MAGIC0 ||(X).a_magic[1] != A_MAGIC1)
    
    /* CPU Id of TARGET machine (byte order coded in low order two bits) */
    #define A_NONE  0x00    /* unknown */
    #define A_I8086 0x04    /* intel i8086/8088 */
    #define A_M68K  0x0B    /* motorola m68000 */
    #define A_NS16K 0x0C    /* national semiconductor 16032 */
    #define A_I80386 0x10   /* intel i80386 */
    #define A_SPARC 0x17    /* Sun SPARC */
    
    #define A_BLR(cputype)  ((cputype&0x01)!=0) /* TRUE if bytes left-to-right */
    #define A_WLR(cputype)  ((cputype&0x02)!=0) /* TRUE if words left-to-right */
    
    /* Flags. */
    #define A_UZP   0x01    /* unmapped zero page (pages) */
    #define A_PAL   0x02    /* page aligned executable */
    #define A_NSYM  0x04    /* new style symbol table */
    #define A_IMG   0x08    /* image instead of executable (e.g. root FS) */
    #define A_EXEC  0x10    /* executable */
    #define A_SEP   0x20    /* separate I/D */
    #define A_PURE  0x40    /* pure text */         /* not used */
    #define A_TOVLY 0x80    /* text overlay */      /* not used */
    
    /* Offsets of various things. */
    #define A_MINHDR        32
    #define A_TEXTPOS(X)    ((long)(X).a_hdrlen)
    #define A_DATAPOS(X)    (A_TEXTPOS(X) + (X).a_text)
    #define A_HASRELS(X)    ((X).a_hdrlen > (unsigned char) A_MINHDR)
    #define A_HASEXT(X)     ((X).a_hdrlen > (unsigned char) (A_MINHDR +  8))
    #define A_HASLNS(X)     ((X).a_hdrlen > (unsigned char) (A_MINHDR + 16))
    #define A_HASTOFF(X)    ((X).a_hdrlen > (unsigned char) (A_MINHDR + 24))
    #define A_TRELPOS(X)    (A_DATAPOS(X) + (X).a_data)
    #define A_DRELPOS(X)    (A_TRELPOS(X) + (X).a_trsize)
    #define A_SYMPOS(X)     (A_TRELPOS(X) + (A_HASRELS(X) ? \
                            ((X).a_trsize + (X).a_drsize) : 0))
    
    struct reloc {
      long r_vaddr;                 /* virtual address of reference */
      unsigned short r_symndx;      /* internal segnum or extern symbol num */
      unsigned short r_type;        /* relocation type */
    };
    
    /* r_tyep values: */
    #define R_ABBS          0
    #define R_RELLBYTE      2
    #define R_PCRBYTE       3
    #define R_RELWORD       4
    #define R_PCRWORD       5
    #define R_RELLONG       6
    #define R_PCRLONG       7
    #define R_REL3BYTE      8
    #define R_KBRANCHE      9
    
    /* r_symndx for internal segments */
    #define S_ABS           ((unsigned short)-1)
    #define S_TEXT          ((unsigned short)-2)
    #define S_DATA          ((unsigned short)-3)
    #define S_BSS           ((unsigned short)-4)
    
    struct nlist {                  /* symbol table entry */
      char n_name[8];               /* symbol name */
      long n_value;                 /* value */
      unsigned char n_sclass;       /* storage class */
      unsigned char n_numaux;       /* number of auxiliary entries (not used) */
      unsigned short n_type;        /* language base and derived type (not used) */
    };
    
    /* Low bits of storage class (section). */
    #define N_SECT            07    /* section mask */
    #define N_UNDF            00    /* undefined */
    #define N_ABS             01    /* absolute */
   #define N_TEXT            02    /* text */
   #define N_DATA            03    /* data */
   #define N_BSS             04    /* bss */
   #define N_COMM            05    /* (common) */
   
   /* High bits of storage class. */
   #define N_CLASS         0370    /* storage class mask */
   #define C_NULL
   #define C_EXT           0020    /* external symbol */
   #define C_STAT          0030    /* static */
   
   /* Function prototypes. */
   #ifndef _ANSI_H
   #include <ansi.h>
   #endif
   
   _PROTOTYPE( int nlist, (char *_file, struct nlist *_nl)                 );
   
   #endif /* _AOUT_H */

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