include/a.out.h

   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 */