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1.1 root 1: /* @(#)syms.h 2.2 */
2: /* Storage Classes are defined in storclass.h */
3: #include "storclass.h"
4:
5: /* Number of characters in a symbol name */
6: #define SYMNMLEN 8
7: /* Number of characters in a file name */
8: #define FILNMLEN 14
9: /* Number of array dimensions in auxiliary entry */
10: #define DIMNUM 4
11:
12:
13: struct syment
14: {
15: char n_name[SYMNMLEN];
16: #ifndef pdp11
17: unsigned
18: #endif
19: long n_value; /* value of symbol */
20: short n_scnum; /* section number */
21: unsigned short n_type; /* type and derived type */
22: char n_sclass; /* storage class */
23: char n_numaux; /* number of auxiliary entries */
24: };
25:
26: /*
27: Relocatable symbols have a section number of the
28: section in which they are defined. Otherwise, section
29: numbers have the following meanings:
30: */
31: /* undefined symbol */
32: #define N_UNDEF 0
33: /* value of symbol is absolute */
34: #define N_ABS -1
35: /* special debugging symbol -- value of symbol is meaningless */
36: #define N_DEBUG -2
37: /* indicates symbol needs transfer vector (preload) */
38: #define N_TV (unsigned short)-3
39:
40: /* indicates symbol needs transfer vector (postload) */
41:
42: #define P_TV (unsigned short)-4
43:
44: /*
45: The fundamental type of a symbol packed into the low
46: 4 bits of the word.
47: */
48:
49: #define _EF ".ef"
50:
51: #define T_NULL 0
52: #define T_ARG 1 /* function argument (only used by compiler) */
53: #define T_CHAR 2 /* character */
54: #define T_SHORT 3 /* short integer */
55: #define T_INT 4 /* integer */
56: #define T_LONG 5 /* long integer */
57: #define T_FLOAT 6 /* floating point */
58: #define T_DOUBLE 7 /* double word */
59: #define T_STRUCT 8 /* structure */
60: #define T_UNION 9 /* union */
61: #define T_ENUM 10 /* enumeration */
62: #define T_MOE 11 /* member of enumeration */
63: #define T_UCHAR 12 /* unsigned character */
64: #define T_USHORT 13 /* unsigned short */
65: #define T_UINT 14 /* unsigned integer */
66: #define T_ULONG 15 /* unsigned long */
67:
68: /*
69: * derived types are:
70: */
71:
72: #define DT_NON 0 /* no derived type */
73: #define DT_PTR 1 /* pointer */
74: #define DT_FCN 2 /* function */
75: #define DT_ARY 3 /* array */
76:
77: /*
78: * type packing constants
79: */
80:
81: #define N_BTMASK 017
82: #define N_TMASK 060
83: #define N_TMASK1 0300
84: #define N_TMASK2 0360
85: #define N_BTSHFT 4
86: #define N_TSHIFT 2
87:
88: /*
89: * MACROS
90: */
91:
92: /* Basic Type of x */
93:
94: #define BTYPE(x) ((x) & N_BTMASK)
95:
96: /* Is x a pointer ? */
97:
98: #define ISPTR(x) (((x) & N_TMASK) == (DT_PTR << N_BTSHFT))
99:
100: /* Is x a function ? */
101:
102: #define ISFCN(x) (((x) & N_TMASK) == (DT_FCN << N_BTSHFT))
103:
104: /* Is x an array ? */
105:
106: #define ISARY(x) (((x) & N_TMASK) == (DT_ARY << N_BTSHFT))
107:
108: /* Is x a structure, union, or enumeration TAG? */
109:
110: #define ISTAG(x) ((x)==C_STRTAG || (x)==C_UNTAG || (x)==C_ENTAG)
111:
112: #define INCREF(x) ((((x)&~N_BTMASK)<<N_TSHIFT)|(DT_PTR<<N_BTSHFT)|(x&N_BTMASK))
113:
114: #define DECREF(x) ((((x)>>N_TSHIFT)&~N_BTMASK)|((x)&N_BTMASK))
115:
116: /*
117: * AUXILIARY ENTRY FORMAT
118: */
119:
120: union auxent
121: {
122: struct
123: {
124: long x_tagndx; /* str, un, or enum tag indx */
125: union
126: {
127: struct
128: {
129: unsigned short x_lnno; /* declaration line number */
130: unsigned short x_size; /* str, union, array size */
131: } x_lnsz;
132: long x_fsize; /* size of function */
133: } x_misc;
134: union
135: {
136: struct /* if ISFCN, tag, or .bb */
137: {
138: long x_lnnoptr; /* ptr to fcn line # */
139: long x_endndx; /* entry ndx past block end */
140: } x_fcn;
141: struct /* if ISARY, up to 4 dimen. */
142: {
143: unsigned short x_dimen[DIMNUM];
144: } x_ary;
145: } x_fcnary;
146: unsigned short x_tvndx; /* tv index */
147: } x_sym;
148: struct
149: {
150: char x_fname[FILNMLEN];
151: } x_file;
152: struct
153: {
154: long x_scnlen; /* section length */
155: unsigned short x_nreloc; /* number of relocation entries */
156: unsigned short x_nlinno; /* number of line numbers */
157: } x_scn;
158:
159: struct
160: {
161: unsigned short x_tvlen; /* length of .tv */
162: unsigned short x_tvran[2]; /* tv range */
163: short x_tvfill; /* tv fill value */
164: } x_tv; /* info about .tv section (in auxent of symbol .tv)) */
165: };
166:
167: #define SYMENT struct syment
168: #define SYMESZ 18 /* sizeof(SYMENT) */
169:
170: #define AUXENT union auxent
171: #define AUXESZ 18 /* sizeof(AUXENT) */
172:
173: /* Defines for "special" symbols */
174:
175: #define _ETEXT "_etext"
176: #define _EDATA "_edata"
177: #define _END "_end"
178:
179: #define _START "_start"
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