xref: /illumos-gate/usr/src/head/syms.h (revision 6e270ca825f06ec0e2d77db462b83074ec585f2f)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*	Copyright (c) 1988 AT&T	*/
23 /*	  All Rights Reserved	*/
24 
25 
26 #ifndef	_SYMS_H
27 #define	_SYMS_H
28 
29 /*		Storage Classes are defined in storclass.h  */
30 #include <storclass.h>
31 
32 #ifdef	__cplusplus
33 extern "C" {
34 #endif
35 
36 /*		Number of characters in a symbol name */
37 #define	SYMNMLEN	8
38 /*		Number of characters in a file name */
39 #define	FILNMLEN	14
40 /*		Number of array dimensions in auxiliary entry */
41 #define	DIMNUM		4
42 
43 struct syment
44 {
45 	union
46 	{
47 		char		_n_name[SYMNMLEN];	/* old COFF version */
48 		struct
49 		{
50 			long	_n_zeroes;	/* new == 0 */
51 			long	_n_offset;	/* offset into string table */
52 		} _n_n;
53 		char		*_n_nptr[2];	/* allows for overlaying */
54 	} _n;
55 	unsigned long		n_value;	/* value of symbol */
56 	short			n_scnum;	/* section number */
57 	unsigned short		n_type;		/* type and derived type */
58 	char			n_sclass;	/* storage class */
59 	char			n_numaux;	/* number of aux. entries */
60 };
61 
62 #define	n_name		_n._n_name
63 #define	n_nptr		_n._n_nptr[1]
64 #define	n_zeroes	_n._n_n._n_zeroes
65 #define	n_offset	_n._n_n._n_offset
66 
67 /*
68  * Relocatable symbols have a section number of the
69  * section in which they are defined.  Otherwise, section
70  * numbers have the following meanings:
71  */
72 	/* undefined symbol */
73 #define	N_UNDEF	0
74 	/* value of symbol is absolute */
75 #define	N_ABS	-1
76 	/* special debugging symbol -- value of symbol is meaningless */
77 #define	N_DEBUG	-2
78 	/* indicates symbol needs transfer vector (preload) */
79 #define	N_TV	(unsigned short)-3
80 
81 	/* indicates symbol needs transfer vector (postload) */
82 
83 #define	P_TV	(unsigned short)-4
84 
85 /*
86  * The fundamental type of a symbol packed into the low
87  * 4 bits of the word.
88  */
89 
90 #define	_EF	".ef"
91 
92 #define	T_NULL		0
93 #define	T_ARG		1	/* function argument (only used by compiler) */
94 #define	T_CHAR		2	/* character */
95 #define	T_SHORT		3	/* short integer */
96 #define	T_INT		4	/* integer */
97 #define	T_LONG		5	/* long integer */
98 #define	T_FLOAT		6	/* floating point */
99 #define	T_DOUBLE	7	/* double word */
100 #define	T_STRUCT	8	/* structure	*/
101 #define	T_UNION		9	/* union	*/
102 #define	T_ENUM		10	/* enumeration	*/
103 #define	T_MOE		11	/* member of enumeration */
104 #define	T_UCHAR		12	/* unsigned character */
105 #define	T_USHORT	13	/* unsigned short */
106 #define	T_UINT		14	/* unsigned integer */
107 #define	T_ULONG		15	/* unsigned long */
108 
109 /*
110  * derived types are:
111  */
112 
113 #define	DT_NON		0	/* no derived type */
114 #define	DT_PTR		1	/* pointer */
115 #define	DT_FCN		2	/* function */
116 #define	DT_ARY		3	/* array */
117 
118 /*
119  *   type packing constants
120  */
121 
122 #define	N_BTMASK	017
123 #define	N_TMASK		060
124 #define	N_TMASK1	0300
125 #define	N_TMASK2	0360
126 #define	N_BTSHFT	4
127 #define	N_TSHIFT	2
128 
129 /*
130  *   MACROS
131  */
132 
133 	/*   Basic Type of  x   */
134 
135 #define	BTYPE(x)  ((x) & N_BTMASK)
136 
137 	/*   Is  x  a  pointer ?   */
138 
139 #define	ISPTR(x)  (((x) & N_TMASK) == (DT_PTR << N_BTSHFT))
140 
141 	/*   Is  x  a  function ?  */
142 
143 #define	ISFCN(x)  (((x) & N_TMASK) == (DT_FCN << N_BTSHFT))
144 
145 	/*   Is  x  an  array ?   */
146 
147 #define	ISARY(x)  (((x) & N_TMASK) == (DT_ARY << N_BTSHFT))
148 
149 	/* Is x a structure, union, or enumeration TAG? */
150 
151 #define	ISTAG(x)  ((x) == C_STRTAG || (x) == C_UNTAG || (x) == C_ENTAG)
152 
153 #define	INCREF(x) ((((x)&~N_BTMASK)<<N_TSHIFT)|(DT_PTR<<N_BTSHFT)|(x&N_BTMASK))
154 
155 #define	DECREF(x) ((((x)>>N_TSHIFT)&~N_BTMASK)|((x)&N_BTMASK))
156 
157 /*
158  *	AUXILIARY ENTRY FORMAT
159  */
160 
161 union auxent
162 {
163 	struct
164 	{
165 		long		x_tagndx;	/* str, un, or enum tag indx */
166 		union
167 		{
168 			struct
169 			{
170 				unsigned short	x_lnno;	/* declaration line */
171 							/* number */
172 				unsigned short	x_size;	/* str, union, array */
173 							/* size */
174 			} x_lnsz;
175 			long	x_fsize;	/* size of function */
176 		} x_misc;
177 		union
178 		{
179 			struct			/* if ISFCN, tag, or .bb */
180 			{
181 				long	x_lnnoptr;	/* ptr to fcn line # */
182 				long	x_endndx;	/* entry ndx past */
183 							/* block end */
184 			}	x_fcn;
185 			struct			/* if ISARY, up to 4 dimen. */
186 			{
187 				unsigned short	x_dimen[DIMNUM];
188 			}	x_ary;
189 		}		x_fcnary;
190 		unsigned short  x_tvndx;		/* tv index */
191 	}	x_sym;
192 	struct
193 	{
194 		char	x_fname[FILNMLEN];
195 	}	x_file;
196 	struct
197 	{
198 		long		x_scnlen;	/* section length */
199 		unsigned short	x_nreloc;	/* number of reloc entries */
200 		unsigned short	x_nlinno;	/* number of line numbers */
201 	}	x_scn;
202 
203 	struct
204 	{
205 		long		x_tvfill;	/* tv fill value */
206 		unsigned short	x_tvlen;	/* length of .tv */
207 		unsigned short	x_tvran[2];	/* tv range */
208 	}	x_tv;	/* info about .tv section (in auxent of symbol .tv)) */
209 };
210 
211 #define	SYMENT	struct syment
212 #define	SYMESZ	18	/* sizeof(SYMENT) */
213 
214 #define	AUXENT	union auxent
215 #define	AUXESZ	18	/* sizeof(AUXENT) */
216 
217 /*	Defines for "special" symbols   */
218 
219 #define	_ETEXT	"etext"
220 #define	_EDATA	"edata"
221 #define	_END	"end"
222 #define	_START	"_start"
223 
224 #ifdef	__cplusplus
225 }
226 #endif
227 
228 #endif	/* _SYMS_H */
229