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1 /*	$NetBSD: cdefs_elf.h,v 1.22 2005/02/26 22:25:34 perry Exp $	*/
2 
3 /*
4  * Copyright (c) 1995, 1996 Carnegie-Mellon University.
5  * All rights reserved.
6  *
7  * Author: Chris G. Demetriou
8  *
9  * Permission to use, copy, modify and distribute this software and
10  * its documentation is hereby granted, provided that both the copyright
11  * notice and this permission notice appear in all copies of the
12  * software, derivative works or modified versions, and any portions
13  * thereof, and that both notices appear in supporting documentation.
14  *
15  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
16  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
17  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
18  *
19  * Carnegie Mellon requests users of this software to return to
20  *
21  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
22  *  School of Computer Science
23  *  Carnegie Mellon University
24  *  Pittsburgh PA 15213-3890
25  *
26  * any improvements or extensions that they make and grant Carnegie the
27  * rights to redistribute these changes.
28  */
29 
30 #ifndef _SYS_CDEFS_ELF_H_
31 #define	_SYS_CDEFS_ELF_H_
32 
33 #ifdef __LEADING_UNDERSCORE
34 #define	_C_LABEL(x)	__CONCAT(_,x)
35 #define _C_LABEL_STRING(x)	"_"x
36 #else
37 #define	_C_LABEL(x)	x
38 #define _C_LABEL_STRING(x)	x
39 #endif
40 
41 #if __STDC__
42 #define	___RENAME(x)	__asm__(___STRING(_C_LABEL(x)))
43 #else
44 #ifdef __LEADING_UNDERSCORE
45 #define	___RENAME(x)	____RENAME(_/**/x)
46 #define	____RENAME(x)	__asm__(___STRING(x))
47 #else
48 #define	___RENAME(x)	__asm__(___STRING(x))
49 #endif
50 #endif
51 
52 #define	__indr_reference(sym,alias)	/* nada, since we do weak refs */
53 
54 #if __STDC__
55 #define	__strong_alias(alias,sym)	       				\
56     __asm__(".global " _C_LABEL_STRING(#alias) "\n"			\
57 	    _C_LABEL_STRING(#alias) " = " _C_LABEL_STRING(#sym));
58 
59 #define	__weak_alias(alias,sym)						\
60     __asm__(".weak " _C_LABEL_STRING(#alias) "\n"			\
61 	    _C_LABEL_STRING(#alias) " = " _C_LABEL_STRING(#sym));
62 #define	__weak_extern(sym)						\
63     __asm__(".weak " _C_LABEL_STRING(#sym));
64 #define	__warn_references(sym,msg)					\
65     __asm__(".section .gnu.warning." #sym "\n\t.ascii \"" msg "\"\n\t.text");
66 
67 #else /* !__STDC__ */
68 
69 #ifdef __LEADING_UNDERSCORE
70 #define __weak_alias(alias,sym) ___weak_alias(_/**/alias,_/**/sym)
71 #define	___weak_alias(alias,sym)					\
72     __asm__(".weak alias\nalias = sym");
73 #else
74 #define	__weak_alias(alias,sym)						\
75     __asm__(".weak alias\nalias = sym");
76 #endif
77 #ifdef __LEADING_UNDERSCORE
78 #define __weak_extern(sym) ___weak_extern(_/**/sym)
79 #define	___weak_extern(sym)						\
80     __asm__(".weak sym");
81 #else
82 #define	__weak_extern(sym)						\
83     __asm__(".weak sym");
84 #endif
85 #define	__warn_references(sym,msg)					\
86     __asm__(".section .gnu.warning.sym\n\t.ascii msg ; .text");
87 
88 #endif /* !__STDC__ */
89 
90 #if __STDC__
91 #define	__SECTIONSTRING(_sec, _str)					\
92 	__asm__(".section " #_sec "\n\t.asciz \"" _str "\"\n\t.previous")
93 #else
94 #define	__SECTIONSTRING(_sec, _str)					\
95 	__asm__(".section _sec\n\t.asciz _str\n\t.previous")
96 #endif
97 
98 /* GCC visibility helper macro */
99 /* This must be used to tag non-static functions that are private, i.e.
100  * never exposed by the shared library. */
101 #define __LIBC_HIDDEN__							\
102 	__attribute__ ((visibility ("hidden")))
103 
104 /* This must be used to tag non-static functions that are public, i.e.
105  * exposed by the shared library, and part of the stable NDK ABI */
106 #define __LIBC_ABI_PUBLIC__ \
107         __attribute__ ((visibility ("default")))
108 
109 /* This must be used to tag non-static functions that must be exported
110  * by the shared library, but whose implementation is private to the
111  * platform. For now this is equivalent to __LIBC_ABI_PUBLIC__, but we
112  * may want to change this later.
113  */
114 #define __LIBC_ABI_PRIVATE__ \
115         __attribute__ ((visibility ("default")))
116 
117 #define	__IDSTRING(_n,_s)		__SECTIONSTRING(.ident,_s)
118 
119 #define	__RCSID(_s)			__IDSTRING(rcsid,_s)
120 #define	__SCCSID(_s)
121 #define __SCCSID2(_s)
122 #if 0	/* XXX userland __COPYRIGHTs have \ns in them */
123 #define	__COPYRIGHT(_s)			__SECTIONSTRING(.copyright,_s)
124 #else
125 #define	__COPYRIGHT(_s)							\
126 	static const char copyright[]					\
127 	    __attribute__((__unused__,__section__(".copyright"))) = _s
128 #endif
129 
130 #define	__KERNEL_RCSID(_n, _s)		__RCSID(_s)
131 #define	__KERNEL_SCCSID(_n, _s)
132 #if 0	/* XXX see above */
133 #define	__KERNEL_COPYRIGHT(_n, _s)	__COPYRIGHT(_s)
134 #else
135 #define	__KERNEL_COPYRIGHT(_n, _s)	__SECTIONSTRING(.copyright, _s)
136 #endif
137 
138 #ifndef __lint__
139 #define	__link_set_make_entry(set, sym)					\
140 	static void const * const __link_set_##set##_sym_##sym		\
141 	    __section("link_set_" #set) __used = &sym
142 #define	__link_set_make_entry2(set, sym, n)				\
143 	static void const * const __link_set_##set##_sym_##sym##_##n	\
144 	    __section("link_set_" #set) __used = &sym[n]
145 #else
146 #define	__link_set_make_entry(set, sym)					\
147 	extern void const * const __link_set_##set##_sym_##sym
148 #define	__link_set_make_entry2(set, sym, n)				\
149 	extern void const * const __link_set_##set##_sym_##sym##_##n
150 #endif /* __lint__ */
151 
152 #define	__link_set_add_text(set, sym)	__link_set_make_entry(set, sym)
153 #define	__link_set_add_rodata(set, sym)	__link_set_make_entry(set, sym)
154 #define	__link_set_add_data(set, sym)	__link_set_make_entry(set, sym)
155 #define	__link_set_add_bss(set, sym)	__link_set_make_entry(set, sym)
156 #define	__link_set_add_text2(set, sym, n)   __link_set_make_entry2(set, sym, n)
157 #define	__link_set_add_rodata2(set, sym, n) __link_set_make_entry2(set, sym, n)
158 #define	__link_set_add_data2(set, sym, n)   __link_set_make_entry2(set, sym, n)
159 #define	__link_set_add_bss2(set, sym, n)    __link_set_make_entry2(set, sym, n)
160 
161 #define	__link_set_decl(set, ptype)					\
162 	extern ptype * const __start_link_set_##set[];			\
163 	extern ptype * const __stop_link_set_##set[]			\
164 
165 #define	__link_set_start(set)	(__start_link_set_##set)
166 #define	__link_set_end(set)	(__stop_link_set_##set)
167 
168 #define	__link_set_count(set)						\
169 	(__link_set_end(set) - __link_set_start(set))
170 
171 #endif /* !_SYS_CDEFS_ELF_H_ */
172