The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /* The <a.out> header file describes the format of executable files. */
    2 
    3 #ifndef _AOUT_H
    4 #define _AOUT_H
    5 
    6 struct  exec {                  /* a.out header */
    7   unsigned char a_magic[2];     /* magic number */
    8   unsigned char a_flags;        /* flags, see below */
    9   unsigned char a_cpu;          /* cpu id */
   10   unsigned char a_hdrlen;       /* length of header */
   11   unsigned char a_unused;       /* reserved for future use */
   12   unsigned short a_version;     /* version stamp (not used at present) */
   13   long          a_text;         /* size of text segement in bytes */
   14   long          a_data;         /* size of data segment in bytes */
   15   long          a_bss;          /* size of bss segment in bytes */
   16   long          a_entry;        /* entry point */
   17   long          a_total;        /* total memory allocated */
   18   long          a_syms;         /* size of symbol table */
   19 
   20   /* SHORT FORM ENDS HERE */
   21   long          a_trsize;       /* text relocation size */
   22   long          a_drsize;       /* data relocation size */
   23   long          a_tbase;        /* text relocation base */
   24   long          a_dbase;        /* data relocation base */
   25 };
   26 
   27 #define A_MAGIC0      (unsigned char) 0x01
   28 #define A_MAGIC1      (unsigned char) 0x03
   29 #define BADMAG(X)     ((X).a_magic[0] != A_MAGIC0 ||(X).a_magic[1] != A_MAGIC1)
   30 
   31 /* CPU Id of TARGET machine (byte order coded in low order two bits) */
   32 #define A_NONE  0x00    /* unknown */
   33 #define A_I8086 0x04    /* intel i8086/8088 */
   34 #define A_M68K  0x0B    /* motorola m68000 */
   35 #define A_NS16K 0x0C    /* national semiconductor 16032 */
   36 #define A_I80386 0x10   /* intel i80386 */
   37 #define A_SPARC 0x17    /* Sun SPARC */
   38 
   39 #define A_BLR(cputype)  ((cputype&0x01)!=0) /* TRUE if bytes left-to-right */
   40 #define A_WLR(cputype)  ((cputype&0x02)!=0) /* TRUE if words left-to-right */
   41 
   42 /* Flags. */
   43 #define A_UZP   0x01    /* unmapped zero page (pages) */
   44 #define A_PAL   0x02    /* page aligned executable */
   45 #define A_NSYM  0x04    /* new style symbol table */
   46 #define A_IMG   0x08    /* image instead of executable (e.g. root FS) */
   47 #define A_EXEC  0x10    /* executable */
   48 #define A_SEP   0x20    /* separate I/D */
   49 #define A_PURE  0x40    /* pure text */         /* not used */
   50 #define A_TOVLY 0x80    /* text overlay */      /* not used */
   51 
   52 /* Offsets of various things. */
   53 #define A_MINHDR        32
   54 #define A_TEXTPOS(X)    ((long)(X).a_hdrlen)
   55 #define A_DATAPOS(X)    (A_TEXTPOS(X) + (X).a_text)
   56 #define A_HASRELS(X)    ((X).a_hdrlen > (unsigned char) A_MINHDR)
   57 #define A_HASEXT(X)     ((X).a_hdrlen > (unsigned char) (A_MINHDR +  8))
   58 #define A_HASLNS(X)     ((X).a_hdrlen > (unsigned char) (A_MINHDR + 16))
   59 #define A_HASTOFF(X)    ((X).a_hdrlen > (unsigned char) (A_MINHDR + 24))
   60 #define A_TRELPOS(X)    (A_DATAPOS(X) + (X).a_data)
   61 #define A_DRELPOS(X)    (A_TRELPOS(X) + (X).a_trsize)
   62 #define A_SYMPOS(X)     (A_TRELPOS(X) + (A_HASRELS(X) ? \
   63                         ((X).a_trsize + (X).a_drsize) : 0))
   64 
   65 struct reloc {
   66   long r_vaddr;                 /* virtual address of reference */
   67   unsigned short r_symndx;      /* internal segnum or extern symbol num */
   68   unsigned short r_type;        /* relocation type */
   69 };
   70 
   71 /* r_tyep values: */
   72 #define R_ABBS          0
   73 #define R_RELLBYTE      2
   74 #define R_PCRBYTE       3
   75 #define R_RELWORD       4
   76 #define R_PCRWORD       5
   77 #define R_RELLONG       6
   78 #define R_PCRLONG       7
   79 #define R_REL3BYTE      8
   80 #define R_KBRANCHE      9
   81 
   82 /* r_symndx for internal segments */
   83 #define S_ABS           ((unsigned short)-1)
   84 #define S_TEXT          ((unsigned short)-2)
   85 #define S_DATA          ((unsigned short)-3)
   86 #define S_BSS           ((unsigned short)-4)
   87 
   88 struct nlist {                  /* symbol table entry */
   89   char n_name[8];               /* symbol name */
   90   long n_value;                 /* value */
   91   unsigned char n_sclass;       /* storage class */
   92   unsigned char n_numaux;       /* number of auxiliary entries (not used) */
   93   unsigned short n_type;        /* language base and derived type (not used) */
   94 };
   95 
   96 /* Low bits of storage class (section). */
   97 #define N_SECT            07    /* section mask */
   98 #define N_UNDF            00    /* undefined */
   99 #define N_ABS             01    /* absolute */
  100 #define N_TEXT            02    /* text */
  101 #define N_DATA            03    /* data */
  102 #define N_BSS             04    /* bss */
  103 #define N_COMM            05    /* (common) */
  104 
  105 /* High bits of storage class. */
  106 #define N_CLASS         0370    /* storage class mask */
  107 #define C_NULL
  108 #define C_EXT           0020    /* external symbol */
  109 #define C_STAT          0030    /* static */
  110 
  111 /* Function prototypes. */
  112 #ifndef _ANSI_H
  113 #include <ansi.h>
  114 #endif
  115 
  116 _PROTOTYPE( int nlist, (char *_file, struct nlist *_nl)                 );
  117 
  118 #endif /* _AOUT_H */

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