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Annotation of 43BSD/include/a.out.h, revision 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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