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Annotation of 42BSD/include/a.out.h, revision 1.1.1.1

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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