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Annotation of 42BSD/include/a.out.h, revision 1.1

1.1     ! root        1: /*     a.out.h 4.1     83/05/03        */
        !             2: 
        !             3: /*
        !             4:  * Header prepended to each a.out file.
        !             5:  */
        !             6: struct exec {
        !             7:        long    a_magic;        /* magic number */
        !             8: unsigned long  a_text;         /* size of text segment */
        !             9: unsigned long  a_data;         /* size of initialized data */
        !            10: unsigned long  a_bss;          /* size of uninitialized data */
        !            11: unsigned long  a_syms;         /* size of symbol table */
        !            12: unsigned long  a_entry;        /* entry point */
        !            13: unsigned long  a_trsize;       /* size of text relocation */
        !            14: unsigned long  a_drsize;       /* size of data relocation */
        !            15: };
        !            16: 
        !            17: #define        OMAGIC  0407            /* old impure format */
        !            18: #define        NMAGIC  0410            /* read-only text */
        !            19: #define        ZMAGIC  0413            /* demand load format */
        !            20: 
        !            21: /*
        !            22:  * Macros which take exec structures as arguments and tell whether
        !            23:  * the file has a reasonable magic number or offsets to text|symbols|strings.
        !            24:  */
        !            25: #define        N_BADMAG(x) \
        !            26:     (((x).a_magic)!=OMAGIC && ((x).a_magic)!=NMAGIC && ((x).a_magic)!=ZMAGIC)
        !            27: 
        !            28: #define        N_TXTOFF(x) \
        !            29:        ((x).a_magic==ZMAGIC ? 1024 : sizeof (struct exec))
        !            30: #define N_SYMOFF(x) \
        !            31:        (N_TXTOFF(x) + (x).a_text+(x).a_data + (x).a_trsize+(x).a_drsize)
        !            32: #define        N_STROFF(x) \
        !            33:        (N_SYMOFF(x) + (x).a_syms)
        !            34: 
        !            35: /*
        !            36:  * Format of a relocation datum.
        !            37:  */
        !            38: struct relocation_info {
        !            39:        int     r_address;      /* address which is relocated */
        !            40: unsigned int   r_symbolnum:24, /* local symbol ordinal */
        !            41:                r_pcrel:1,      /* was relocated pc relative already */
        !            42:                r_length:2,     /* 0=byte, 1=word, 2=long */
        !            43:                r_extern:1,     /* does not include value of sym referenced */
        !            44:                :4;             /* nothing, yet */
        !            45: };
        !            46: 
        !            47: /*
        !            48:  * Format of a symbol table entry; this file is included by <a.out.h>
        !            49:  * and should be used if you aren't interested the a.out header
        !            50:  * or relocation information.
        !            51:  */
        !            52: struct nlist {
        !            53:        union {
        !            54:                char    *n_name;        /* for use when in-core */
        !            55:                long    n_strx;         /* index into file string table */
        !            56:        } n_un;
        !            57: unsigned char  n_type;         /* type flag, i.e. N_TEXT etc; see below */
        !            58:        char    n_other;        /* unused */
        !            59:        short   n_desc;         /* see <stab.h> */
        !            60: unsigned long  n_value;        /* value of this symbol (or sdb offset) */
        !            61: };
        !            62: #define        n_hash  n_desc          /* used internally by ld */
        !            63: 
        !            64: /*
        !            65:  * Simple values for n_type.
        !            66:  */
        !            67: #define        N_UNDF  0x0             /* undefined */
        !            68: #define        N_ABS   0x2             /* absolute */
        !            69: #define        N_TEXT  0x4             /* text */
        !            70: #define        N_DATA  0x6             /* data */
        !            71: #define        N_BSS   0x8             /* bss */
        !            72: #define        N_COMM  0x12            /* common (internal to ld) */
        !            73: #define        N_FN    0x1f            /* file name symbol */
        !            74: 
        !            75: #define        N_EXT   01              /* external bit, or'ed in */
        !            76: #define        N_TYPE  0x1e            /* mask for all the type bits */
        !            77: 
        !            78: /*
        !            79:  * Sdb entries have some of the N_STAB bits set.
        !            80:  * These are given in <stab.h>
        !            81:  */
        !            82: #define        N_STAB  0xe0            /* if any of these bits set, a SDB entry */
        !            83: 
        !            84: /*
        !            85:  * Format for namelist values.
        !            86:  */
        !            87: #define        N_FORMAT        "%08x"

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