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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 (at) 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 #define __LIBC_HIDDEN__							\
    100 	__attribute__ ((visibility ("hidden")))
    101 
    102 #define	__IDSTRING(_n,_s)		__SECTIONSTRING(.ident,_s)
    103 
    104 #define	__RCSID(_s)			__IDSTRING(rcsid,_s)
    105 #define	__SCCSID(_s)
    106 #define __SCCSID2(_s)
    107 #if 0	/* XXX userland __COPYRIGHTs have \ns in them */
    108 #define	__COPYRIGHT(_s)			__SECTIONSTRING(.copyright,_s)
    109 #else
    110 #define	__COPYRIGHT(_s)							\
    111 	static const char copyright[]					\
    112 	    __attribute__((__unused__,__section__(".copyright"))) = _s
    113 #endif
    114 
    115 #define	__KERNEL_RCSID(_n, _s)		__RCSID(_s)
    116 #define	__KERNEL_SCCSID(_n, _s)
    117 #if 0	/* XXX see above */
    118 #define	__KERNEL_COPYRIGHT(_n, _s)	__COPYRIGHT(_s)
    119 #else
    120 #define	__KERNEL_COPYRIGHT(_n, _s)	__SECTIONSTRING(.copyright, _s)
    121 #endif
    122 
    123 #ifndef __lint__
    124 #define	__link_set_make_entry(set, sym)					\
    125 	static void const * const __link_set_##set##_sym_##sym		\
    126 	    __section("link_set_" #set) __used = &sym
    127 #define	__link_set_make_entry2(set, sym, n)				\
    128 	static void const * const __link_set_##set##_sym_##sym##_##n	\
    129 	    __section("link_set_" #set) __used = &sym[n]
    130 #else
    131 #define	__link_set_make_entry(set, sym)					\
    132 	extern void const * const __link_set_##set##_sym_##sym
    133 #define	__link_set_make_entry2(set, sym, n)				\
    134 	extern void const * const __link_set_##set##_sym_##sym##_##n
    135 #endif /* __lint__ */
    136 
    137 #define	__link_set_add_text(set, sym)	__link_set_make_entry(set, sym)
    138 #define	__link_set_add_rodata(set, sym)	__link_set_make_entry(set, sym)
    139 #define	__link_set_add_data(set, sym)	__link_set_make_entry(set, sym)
    140 #define	__link_set_add_bss(set, sym)	__link_set_make_entry(set, sym)
    141 #define	__link_set_add_text2(set, sym, n)   __link_set_make_entry2(set, sym, n)
    142 #define	__link_set_add_rodata2(set, sym, n) __link_set_make_entry2(set, sym, n)
    143 #define	__link_set_add_data2(set, sym, n)   __link_set_make_entry2(set, sym, n)
    144 #define	__link_set_add_bss2(set, sym, n)    __link_set_make_entry2(set, sym, n)
    145 
    146 #define	__link_set_decl(set, ptype)					\
    147 	extern ptype * const __start_link_set_##set[];			\
    148 	extern ptype * const __stop_link_set_##set[]			\
    149 
    150 #define	__link_set_start(set)	(__start_link_set_##set)
    151 #define	__link_set_end(set)	(__stop_link_set_##set)
    152 
    153 #define	__link_set_count(set)						\
    154 	(__link_set_end(set) - __link_set_start(set))
    155 
    156 #endif /* !_SYS_CDEFS_ELF_H_ */
    157