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Annotation of 43BSD/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     5.1 (Berkeley) 5/30/85
                      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: #define        N_TXTOFF(x) \
                     24:        ((x).a_magic==ZMAGIC ? 1024 : sizeof (struct exec))
                     25: #define N_SYMOFF(x) \
                     26:        (N_TXTOFF(x) + (x).a_text+(x).a_data + (x).a_trsize+(x).a_drsize)
                     27: #define        N_STROFF(x) \
                     28:        (N_SYMOFF(x) + (x).a_syms)
                     29: 
                     30: /*
                     31:  * Format of a relocation datum.
                     32:  */
                     33: struct relocation_info {
                     34:        int     r_address;      /* address which is relocated */
                     35: unsigned int   r_symbolnum:24, /* local symbol ordinal */
                     36:                r_pcrel:1,      /* was relocated pc relative already */
                     37:                r_length:2,     /* 0=byte, 1=word, 2=long */
                     38:                r_extern:1,     /* does not include value of sym referenced */
                     39:                :4;             /* nothing, yet */
                     40: };
                     41: 
                     42: /*
                     43:  * Format of a symbol table entry; this file is included by <a.out.h>
                     44:  * and should be used if you aren't interested the a.out header
                     45:  * or relocation information.
                     46:  */
                     47: struct nlist {
                     48:        union {
                     49:                char    *n_name;        /* for use when in-core */
                     50:                long    n_strx;         /* index into file string table */
                     51:        } n_un;
                     52: unsigned char  n_type;         /* type flag, i.e. N_TEXT etc; see below */
                     53:        char    n_other;        /* unused */
                     54:        short   n_desc;         /* see <stab.h> */
                     55: unsigned long  n_value;        /* value of this symbol (or sdb offset) */
                     56: };
                     57: #define        n_hash  n_desc          /* used internally by ld */
                     58: 
                     59: /*
                     60:  * Simple values for n_type.
                     61:  */
                     62: #define        N_UNDF  0x0             /* undefined */
                     63: #define        N_ABS   0x2             /* absolute */
                     64: #define        N_TEXT  0x4             /* text */
                     65: #define        N_DATA  0x6             /* data */
                     66: #define        N_BSS   0x8             /* bss */
                     67: #define        N_COMM  0x12            /* common (internal to ld) */
                     68: #define        N_FN    0x1f            /* file name symbol */
                     69: 
                     70: #define        N_EXT   01              /* external bit, or'ed in */
                     71: #define        N_TYPE  0x1e            /* mask for all the type bits */
                     72: 
                     73: /*
                     74:  * Sdb entries have some of the N_STAB bits set.
                     75:  * These are given in <stab.h>
                     76:  */
                     77: #define        N_STAB  0xe0            /* if any of these bits set, a SDB entry */
                     78: 
                     79: /*
                     80:  * Format for namelist values.
                     81:  */
                     82: #define        N_FORMAT        "%08x"

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