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Annotation of 43BSDReno/include/a.out.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1980 Regents of the University of California.
                      3:  * All rights reserved.  The Berkeley software License Agreement
                      4:  * specifies the terms and conditions for redistribution.
                      5:  *
                      6:  *     @(#)a.out.h     5.3 (Berkeley) 6/24/90
                      7:  */
                      8: 
                      9: /*
                     10:  * Definitions of the a.out header
                     11:  * and magic numbers are shared with
                     12:  * the kernel.
                     13:  */
                     14: #include <sys/exec.h>
                     15: 
                     16: /*
                     17:  * Macros which take exec structures as arguments and tell whether
                     18:  * the file has a reasonable magic number or offsets to text|symbols|strings.
                     19:  */
                     20: #define        N_BADMAG(x) \
                     21:     (((x).a_magic)!=OMAGIC && ((x).a_magic)!=NMAGIC && ((x).a_magic)!=ZMAGIC)
                     22: 
                     23: #if defined(vax) || defined(tahoe)
                     24: #define        N_TXTOFF(x) \
                     25:        ((x).a_magic == ZMAGIC ? 1024 : sizeof (struct exec))
                     26: #endif
                     27: 
                     28: #if defined(hp300)
                     29: #define        N_TXTOFF(x) \
                     30:        ((x).a_magic == ZMAGIC ? 4096 : sizeof (struct exec))
                     31: #endif
                     32: 
                     33: #define N_SYMOFF(x) \
                     34:        (N_TXTOFF(x) + (x).a_text+(x).a_data + (x).a_trsize+(x).a_drsize)
                     35: 
                     36: #define        N_STROFF(x) \
                     37:        (N_SYMOFF(x) + (x).a_syms)
                     38: 
                     39: /*
                     40:  * Format of a relocation datum.
                     41:  */
                     42: struct relocation_info {
                     43:        int     r_address;      /* address which is relocated */
                     44: unsigned int   r_symbolnum:24, /* local symbol ordinal */
                     45:                r_pcrel:1,      /* was relocated pc relative already */
                     46:                r_length:2,     /* 0=byte, 1=word, 2=long */
                     47:                r_extern:1,     /* does not include value of sym referenced */
                     48:                :4;             /* nothing, yet */
                     49: };
                     50: 
                     51: /*
                     52:  * Format of a symbol table entry; this file is included by <a.out.h>
                     53:  * and should be used if you aren't interested the a.out header
                     54:  * or relocation information.
                     55:  */
                     56: struct nlist {
                     57:        union {
                     58:                char    *n_name;        /* for use when in-core */
                     59:                long    n_strx;         /* index into file string table */
                     60:        } n_un;
                     61: unsigned char  n_type;         /* type flag, i.e. N_TEXT etc; see below */
                     62:        char    n_other;        /* unused */
                     63:        short   n_desc;         /* see <stab.h> */
                     64: unsigned long  n_value;        /* value of this symbol (or sdb offset) */
                     65: };
                     66: #define        n_hash  n_desc          /* used internally by ld */
                     67: 
                     68: /*
                     69:  * Simple values for n_type.
                     70:  */
                     71: #define        N_UNDF  0x0             /* undefined */
                     72: #define        N_ABS   0x2             /* absolute */
                     73: #define        N_TEXT  0x4             /* text */
                     74: #define        N_DATA  0x6             /* data */
                     75: #define        N_BSS   0x8             /* bss */
                     76: #define        N_COMM  0x12            /* common (internal to ld) */
                     77: #define        N_FN    0x1e            /* file name symbol */
                     78: 
                     79: #define        N_EXT   01              /* external bit, or'ed in */
                     80: #define        N_TYPE  0x1e            /* mask for all the type bits */
                     81: 
                     82: /*
                     83:  * Sdb entries have some of the N_STAB bits set.
                     84:  * These are given in <stab.h>
                     85:  */
                     86: #define        N_STAB  0xe0            /* if any of these bits set, a SDB entry */
                     87: 
                     88: /*
                     89:  * Format for namelist values.
                     90:  */
                     91: #define        N_FORMAT        "%08x"

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