compilers/linux86-0.16.17/ld/x86_aout.h

   1 /* Copyright (C) 1990-1996
   2  * This file is part of the ld86 command for Linux-86
   3  * It is distributed under the GNU Library General Public License.
   4  *
   5  * - This may actually be BSD or Minix code, can someone clarify please. -RDB
   6  */
   7
   8 #ifndef __AOUT_H
   9 #define __AOUT_H
  10
  11 /* If the host isn't an x86 all bets are off, use chars. */
  12 #if defined(i386) || defined(__BCC__) || defined(MSDOS)
  13 typedef long Long;
  14 #define __OUT_OK 1
  15 #else
  16 typedef char Long[4];
  17 #endif
  18
  19 struct  exec {                  /* a.out header */
  20   unsigned char a_magic[2];     /* magic number */
  21   unsigned char a_flags;        /* flags, see below */
  22   unsigned char a_cpu;          /* cpu id */
  23   unsigned char a_hdrlen;       /* length of header */
  24   unsigned char a_unused;       /* reserved for future use */
  25   unsigned char a_version[2];   /* version stamp (not used at present) */
  26   Long          a_text;         /* size of text segement in bytes */
  27   Long          a_data;         /* size of data segment in bytes */
  28   Long          a_bss;          /* size of bss segment in bytes */
  29   Long          a_entry;        /* entry point */
  30   Long          a_total;        /* total memory allocated */
  31   Long          a_syms;         /* size of symbol table */
  32
  33   /* SHORT FORM ENDS HERE */
  34   Long          a_trsize;       /* text relocation size */
  35   Long          a_drsize;       /* data relocation size */
  36   Long          a_tbase;        /* text relocation base */
  37   Long          a_dbase;        /* data relocation base */
  38 };
  39
  40 #define A_MAGIC0      (unsigned char) 0x01
  41 #define A_MAGIC1      (unsigned char) 0x03
  42 #define BADMAG(X)     ((X).a_magic[0] != A_MAGIC0 ||(X).a_magic[1] != A_MAGIC1)
  43
  44 /* CPU Id of TARGET machine (byte order coded in low order two bits) */
  45 #define A_NONE   0x00   /* unknown */
  46 #define A_I8086  0x04   /* intel i8086/8088 */
  47 #define A_M68K   0x0B   /* motorola m68000 */
  48 #define A_NS16K  0x0C   /* national semiconductor 16032 */
  49 #define A_I80386 0x10   /* intel i80386 */
  50 #define A_SPARC  0x17   /* Sun SPARC */
  51
  52 #define A_BLR(cputype)  ((cputype&0x01)!=0) /* TRUE if bytes left-to-right */
  53 #define A_WLR(cputype)  ((cputype&0x02)!=0) /* TRUE if words left-to-right */
  54
  55 /* Flags. */
  56 #define A_UZP   0x01    /* unmapped zero page (pages) */
  57 #define A_PAL   0x02    /* page aligned executable */
  58 #define A_NSYM  0x04    /* new style symbol table */
  59 #define A_EXEC  0x10    /* executable */
  60 #define A_SEP   0x20    /* separate I/D */
  61 #define A_PURE  0x40    /* pure text */
  62 #define A_TOVLY 0x80    /* text overlay */
  63
  64 /* Offsets of various things. */
  65 #define A_MINHDR        32
  66 #define A_TEXTPOS(X)    ((long)(X).a_hdrlen)
  67 #define A_HASRELS(X)    ((X).a_hdrlen > (unsigned char) A_MINHDR)
  68 #define A_HASEXT(X)     ((X).a_hdrlen > (unsigned char) (A_MINHDR +  8))
  69 #define A_HASLNS(X)     ((X).a_hdrlen > (unsigned char) (A_MINHDR + 16))
  70 #define A_HASTOFF(X)    ((X).a_hdrlen > (unsigned char) (A_MINHDR + 24))
  71 #ifdef __OUT_OK
  72 #define A_DATAPOS(X)    (A_TEXTPOS(X) + (X).a_text)
  73 #define A_TRELPOS(X)    (A_DATAPOS(X) + (X).a_data)
  74 #define A_DRELPOS(X)    (A_TRELPOS(X) + (X).a_trsize)
  75 #define A_SYMPOS(X)     (A_TRELPOS(X) + (A_HASRELS(X) ? \
  76                         ((X).a_trsize + (X).a_drsize) : 0))
  77 #endif
  78
  79 struct reloc {
  80   long r_vaddr;                 /* virtual address of reference */
  81   unsigned short r_symndx;      /* internal segnum or extern symbol num */
  82   unsigned short r_type;        /* relocation type */
  83 };
  84
  85 /* r_tyep values: */
  86 #define R_ABBS          0
  87 #define R_RELLBYTE      2
  88 #define R_PCRBYTE       3
  89 #define R_RELWORD       4
  90 #define R_PCRWORD       5
  91 #define R_RELLONG       6
  92 #define R_PCRLONG       7
  93 #define R_REL3BYTE      8
  94 #define R_KBRANCHE      9
  95
  96 /* r_symndx for internal segments */
  97 #define S_ABS           ((unsigned short)-1)
  98 #define S_TEXT          ((unsigned short)-2)
  99 #define S_DATA          ((unsigned short)-3)
 100 #define S_BSS           ((unsigned short)-4)
 101
 102 struct nlist {                  /* symbol table entry */
 103   char n_name[8];               /* symbol name */
 104   Long n_value;                 /* value */
 105   unsigned char n_sclass;       /* storage class */
 106   unsigned char n_numaux;       /* number of auxiliary entries (not used) */
 107   unsigned short n_type;        /* language base and derived type (not used) */
 108 };
 109
 110 /* Low bits of storage class (section). */
 111 #define N_SECT            07    /* section mask */
 112 #define N_UNDF            00    /* undefined */
 113 #define N_ABS             01    /* absolute */
 114 #define N_TEXT            02    /* text */
 115 #define N_DATA            03    /* data */
 116 #define N_BSS             04    /* bss */
 117 #define N_COMM            05    /* (common) */
 118
 119 /* High bits of storage class. */
 120 #define N_CLASS         0370    /* storage class mask */
 121 #define C_NULL          0
 122 #define C_EXT           0020    /* external symbol */
 123 #define C_STAT          0030    /* static */
 124
 125 #endif /* _AOUT_H */