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Annotation of hatari/src/debug/a.out.h, revision 1.1.1.1

1.1       root        1: /* a.out.h - Definitions and declarations for GNU-style a.out
                      2:    binaries.
                      3:    Written by Guido Flohr ([email protected]).
                      4: 
                      5:    This file is in the public domain. */
                      6: 
                      7: #ifndef __A_OUT_GNU_H__
                      8: #define __A_OUT_GNU_H__ 1
                      9: 
                     10: struct nlist {
                     11:   union {
                     12:     const char *n_name;     /* in memory address */
                     13:     struct nlist *n_next;
                     14:     size_t n_strx;          /* string table offset */
                     15:   } n_un;
                     16:   unsigned char n_type;
                     17:   char n_other;
                     18:   short n_desc;
                     19:   uint32_t n_value;
                     20: };
                     21: 
                     22: /* sizeof(struct nlist) on disk */
                     23: #define SIZEOF_STRUCT_NLIST 12
                     24: 
                     25: 
                     26: #define N_UNDF   0x00       /* undefined */
                     27: #define N_ABS    0x02       /* absolute */
                     28: #define N_TEXT   0x04       /* text */
                     29: #define N_DATA   0x06       /* data */
                     30: #define N_BSS    0x08       /* bss */
                     31: #define N_SIZE   0x0c       /* pseudo type, defines a symbol's size */
                     32: #define N_FN     0x1f       /* File name of a .o file */
                     33: #define N_COMM   0x12       /* common (internal to ld) */
                     34: 
                     35: #define N_EXT    0x01       /* external bit, or'ed in */
                     36: #define N_TYPE   0x1e       /* mask for all the type bits */
                     37: #define N_STAB   0xe0       /* if any of these bits set, don't discard */
                     38: 
                     39: /* The following type indicates the definition of a symbol as being
                     40:    an indirect reference to another symbol.  The other symbol
                     41:    appears as an undefined reference, immediately following this symbol.
                     42: 
                     43:    Indirection is asymmetrical.  The other symbol's value will be used
                     44:    to satisfy requests for the indirect symbol, but not vice versa.
                     45:    If the other symbol does not have a definition, libraries will
                     46:    be searched to find a definition. */
                     47: #define N_INDR 0x0a
                     48: 
                     49: /* The following symbols refer to set elements.
                     50:    All the N_SET[ATDB] symbols with the same name form one set.
                     51:    Space is allocated for the set in the text section, and each set
                     52:    element's value is stored into one word of the space.
                     53:    The first word of the space is the length of the set (number of elements).
                     54: 
                     55:    The address of the set is made into an N_SETV symbol
                     56:    whose name is the same as the name of the set.
                     57:    This symbol acts like a N_DATA global symbol
                     58:    in that it can satisfy undefined external references. */
                     59: 
                     60: /* These appear as input to LD, in a .o file. */
                     61: #define N_SETA  0x14        /* Absolute set element symbol */
                     62: #define N_SETT  0x16        /* Text set element symbol */
                     63: #define N_SETD  0x18        /* Data set element symbol */
                     64: #define N_SETB  0x1A        /* Bss set element symbol */
                     65: 
                     66: /* This is output from LD. */
                     67: #define N_SETV  0x1C        /* Pointer to set vector in data area. */
                     68: 
                     69: /* Warning symbol. The text gives a warning message, the next symbol
                     70:    in the table will be undefined. When the symbol is referenced, the
                     71:    message is printed. */
                     72: 
                     73: #define N_WARNING 0x1e
                     74: 
                     75: /* Weak symbols.  These are a GNU extension to the a.out format.  The
                     76:    semantics are those of ELF weak symbols.  Weak symbols are always
                     77:    externally visible.  The N_WEAK? values are squeezed into the
                     78:    available slots.  The value of a N_WEAKU symbol is 0.  The values
                     79:    of the other types are the definitions. */
                     80: #define N_WEAKU 0x0d        /* Weak undefined symbol. */
                     81: #define N_WEAKA 0x0e        /* Weak absolute symbol. */
                     82: #define N_WEAKT 0x0f        /* Weak text symbol. */
                     83: #define N_WEAKD 0x10        /* Weak data symbol. */
                     84: #define N_WEAKB 0x11        /* Weak bss symbol. */
                     85: 
                     86: #endif /* __A_OUT_GNU_H__ */

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