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1.1 root 1: /*
2: * COFF symbol symbol entry file.
3: */
4:
5: /* Storage Classes are defined in storclass.h */
6: #include "storclass.h"
7:
8: /* Number of characters in a symbol name */
9: #define SYMNMLEN 8
10: /* Number of characters in a file name */
11: #define FILNMLEN 14
12: /* Number of array dimensions in auxiliary entry */
13: #define DIMNUM 4
14:
15:
16: struct syment
17: {
18: union
19: {
20: char _n_name[SYMNMLEN]; /* old COFF version */
21: struct
22: {
23: long _n_zeroes; /* new == 0 */
24: long _n_offset; /* offset into string table */
25: } _n_n;
26: char *_n_nptr[2]; /* allows for overlaying */
27: } _n;
28: long n_value; /* value of symbol */
29: short n_scnum; /* section number */
30: unsigned short n_type; /* type and derived type */
31: char n_sclass; /* storage class */
32: char n_numaux; /* number of aux. entries */
33: };
34:
35: #define n_name _n._n_name
36: #define n_nptr _n._n_nptr[1]
37: #define n_zeroes _n._n_n._n_zeroes
38: #define n_offset _n._n_n._n_offset
39:
40: /*
41: Relocatable symbols have a section number of the
42: section in which they are defined. Otherwise, section
43: numbers have the following meanings:
44: */
45: /* undefined symbol */
46: #define N_UNDEF 0
47: /* value of symbol is absolute */
48: #define N_ABS -1
49: /* special debugging symbol -- value of symbol is meaningless */
50: #define N_DEBUG -2
51: /* indicates symbol needs transfer vector (preload) */
52: #define N_TV (unsigned short)-3
53:
54: /* indicates symbol needs transfer vector (postload) */
55:
56: #define P_TV (unsigned short)-4
57:
58: /*
59: The fundamental type of a symbol packed into the low
60: 4 bits of the word.
61: */
62:
63: #define _EF ".ef"
64:
65: #define T_NULL 0
66: #define T_ARG 1 /* function argument (only used by compiler) */
67: #define T_CHAR 2 /* character */
68: #define T_SHORT 3 /* short integer */
69: #define T_INT 4 /* integer */
70: #define T_LONG 5 /* long integer */
71: #define T_FLOAT 6 /* floating point */
72: #define T_DOUBLE 7 /* double word */
73: #define T_STRUCT 8 /* structure */
74: #define T_UNION 9 /* union */
75: #define T_ENUM 10 /* enumeration */
76: #define T_MOE 11 /* member of enumeration */
77: #define T_UCHAR 12 /* unsigned character */
78: #define T_USHORT 13 /* unsigned short */
79: #define T_UINT 14 /* unsigned integer */
80: #define T_ULONG 15 /* unsigned long */
81:
82: /*
83: * derived types are:
84: */
85:
86: #define DT_NON 0 /* no derived type */
87: #define DT_PTR 1 /* pointer */
88: #define DT_FCN 2 /* function */
89: #define DT_ARY 3 /* array */
90:
91: /*
92: * type packing constants
93: */
94:
95: #define N_BTMASK 017
96: #define N_TMASK 060
97: #define N_TMASK1 0300
98: #define N_TMASK2 0360
99: #define N_BTSHFT 4
100: #define N_TSHIFT 2
101:
102: /*
103: * MACROS
104: */
105:
106: /* Basic Type of x */
107:
108: #define BTYPE(x) ((x) & N_BTMASK)
109:
110: /* Is x a pointer ? */
111:
112: #define ISPTR(x) (((x) & N_TMASK) == (DT_PTR << N_BTSHFT))
113:
114: /* Is x a function ? */
115:
116: #define ISFCN(x) (((x) & N_TMASK) == (DT_FCN << N_BTSHFT))
117:
118: /* Is x an array ? */
119:
120: #define ISARY(x) (((x) & N_TMASK) == (DT_ARY << N_BTSHFT))
121:
122: /* Is x a structure, union, or enumeration TAG? */
123:
124: #define ISTAG(x) ((x)==C_STRTAG || (x)==C_UNTAG || (x)==C_ENTAG)
125:
126: #define INCREF(x) ((((x)&~N_BTMASK)<<N_TSHIFT)|(DT_PTR<<N_BTSHFT)|(x&N_BTMASK))
127:
128: #define DECREF(x) ((((x)>>N_TSHIFT)&~N_BTMASK)|((x)&N_BTMASK))
129:
130: /*
131: * AUXILIARY ENTRY FORMAT
132: */
133:
134: union auxent
135: {
136: struct
137: {
138: long x_tagndx; /* str, un, or enum tag indx */
139: union
140: {
141: struct
142: {
143: unsigned short x_lnno; /* declaration line number */
144: unsigned short x_size; /* str, union, array size */
145: } x_lnsz;
146: long x_fsize; /* size of function */
147: } x_misc;
148: union
149: {
150: struct /* if ISFCN, tag, or .bb */
151: {
152: long x_lnnoptr; /* ptr to fcn line # */
153: long x_endndx; /* entry ndx past block end */
154: } x_fcn;
155: struct /* if ISARY, up to 4 dimen. */
156: {
157: unsigned short x_dimen[DIMNUM];
158: } x_ary;
159: } x_fcnary;
160: unsigned short x_tvndx; /* tv index */
161: } x_sym;
162: struct
163: {
164: char x_fname[FILNMLEN];
165: } x_file;
166: struct
167: {
168: long x_scnlen; /* section length */
169: unsigned short x_nreloc; /* number of relocation entries */
170: unsigned short x_nlinno; /* number of line numbers */
171: } x_scn;
172:
173: struct
174: {
175: long x_tvfill; /* tv fill value */
176: unsigned short x_tvlen; /* length of .tv */
177: unsigned short x_tvran[2]; /* tv range */
178: } x_tv; /* info about .tv section (in auxent of symbol .tv)) */
179: };
180:
181: #define SYMENT struct syment
182: #define SYMESZ 18 /* sizeof(SYMENT) */
183:
184: #define AUXENT union auxent
185: #define AUXESZ 18 /* sizeof(AUXENT) */
186:
187: /* Defines for "special" symbols */
188:
189: #if VAX
190: #define _ETEXT "_etext"
191: #define _EDATA "_edata"
192: #define _END "_end"
193: #else
194: #define _ETEXT "etext"
195: #define _EDATA "edata"
196: #define _END "end"
197: #endif
198:
199: #define _START "_start"
200:
201: #define _TVORIG "_tvorig"
202: #define _TORIGIN "_torigin"
203: #define _DORIGIN "_dorigin"
204:
205: #define _SORIGIN "_sorigin"
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