[a9153ec] | 1 | /*- |
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| 2 | * Copyright (c) 1999 John D. Polstra |
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| 3 | * Copyright (c) 1999,2001 Peter Wemm <peter@FreeBSD.org> |
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| 4 | * All rights reserved. |
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| 5 | * |
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| 6 | * Redistribution and use in source and binary forms, with or without |
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| 7 | * modification, are permitted provided that the following conditions |
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| 8 | * are met: |
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| 9 | * 1. Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * |
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| 15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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| 16 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 17 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 18 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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| 19 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 20 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 21 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 22 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 23 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 24 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 25 | * SUCH DAMAGE. |
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| 26 | * |
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| 27 | * $FreeBSD$ |
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| 28 | */ |
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| 29 | |
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[e599318] | 30 | #ifndef _SYS_LINKER_SET_H_ |
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| 31 | #define _SYS_LINKER_SET_H_ |
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[a9153ec] | 32 | |
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[a3dde3e] | 33 | #ifndef _SYS_CDEFS_H_ |
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[a9153ec] | 34 | #error this file needs sys/cdefs.h as a prerequisite |
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| 35 | #endif |
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| 36 | |
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| 37 | /* |
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| 38 | * The following macros are used to declare global sets of objects, which |
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| 39 | * are collected by the linker into a `linker_set' as defined below. |
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| 40 | * For ELF, this is done by constructing a separate segment for each set. |
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| 41 | */ |
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| 42 | |
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| 43 | /* |
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| 44 | * Private macros, not to be used outside this header file. |
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| 45 | */ |
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| 46 | #ifdef __GNUCLIKE___SECTION |
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| 47 | #ifndef __rtems__ |
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| 48 | #define __MAKE_SET(set, sym) \ |
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[66659ff] | 49 | __GLOBL(__CONCAT(__start_set_,set)); \ |
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| 50 | __GLOBL(__CONCAT(__stop_set_,set)); \ |
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[a9153ec] | 51 | static void const * const __set_##set##_sym_##sym \ |
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| 52 | __section("set_" #set) __used = &sym |
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| 53 | #else /* __rtems__ */ |
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[5084ad8] | 54 | #define RTEMS_BSD_DEFINE_SET(set, ptype) \ |
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| 55 | ptype * const __CONCAT(_bsd__start_set_,set)[0] \ |
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| 56 | __section(".rtemsroset.bsd." __STRING(set) ".begin") __used; \ |
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| 57 | ptype * const __CONCAT(_bsd__stop_set_,set)[0] \ |
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| 58 | __section(".rtemsroset.bsd." __STRING(set) ".end") __used |
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| 59 | |
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[a9153ec] | 60 | #define __MAKE_SET(set, sym) \ |
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[5084ad8] | 61 | static const void * const __set_##set##_sym_##sym \ |
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| 62 | __section(".rtemsroset.bsd." __STRING(set) ".content") __used = &sym |
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| 63 | |
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| 64 | #define RTEMS_BSD_DEFINE_RWSET(set, ptype) \ |
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| 65 | ptype *__CONCAT(_bsd__start_set_,set)[0] \ |
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| 66 | __section(".rtemsrwset.bsd." __STRING(set) ".begin") __used; \ |
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| 67 | ptype *__CONCAT(_bsd__stop_set_,set)[0] \ |
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| 68 | __section(".rtemsrwset.bsd." __STRING(set) ".end") __used |
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| 69 | |
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| 70 | #define __MAKE_RWSET(set, sym) \ |
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| 71 | static const void * __set_##set##_sym_##sym \ |
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| 72 | __section(".rtemsrwset.bsd." __STRING(set) ".content") __used = &sym |
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[a9153ec] | 73 | #endif /* __rtems__ */ |
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| 74 | #else /* !__GNUCLIKE___SECTION */ |
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| 75 | #ifndef lint |
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| 76 | #error this file needs to be ported to your compiler |
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| 77 | #endif /* lint */ |
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| 78 | #define __MAKE_SET(set, sym) extern void const * const (__set_##set##_sym_##sym) |
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| 79 | #endif /* __GNUCLIKE___SECTION */ |
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| 80 | |
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| 81 | /* |
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| 82 | * Public macros. |
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| 83 | */ |
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| 84 | #define TEXT_SET(set, sym) __MAKE_SET(set, sym) |
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| 85 | #define DATA_SET(set, sym) __MAKE_SET(set, sym) |
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| 86 | #define BSS_SET(set, sym) __MAKE_SET(set, sym) |
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| 87 | #define ABS_SET(set, sym) __MAKE_SET(set, sym) |
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| 88 | #define SET_ENTRY(set, sym) __MAKE_SET(set, sym) |
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[5084ad8] | 89 | #ifdef __rtems__ |
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| 90 | #define RWDATA_SET(set, sym) __MAKE_RWSET(set, sym) |
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| 91 | #endif /* __rtems__ */ |
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[a9153ec] | 92 | |
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| 93 | /* |
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| 94 | * Initialize before referring to a given linker set. |
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| 95 | */ |
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| 96 | #ifndef __rtems__ |
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| 97 | #define SET_DECLARE(set, ptype) \ |
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| 98 | extern ptype *__CONCAT(__start_set_,set); \ |
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| 99 | extern ptype *__CONCAT(__stop_set_,set) |
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| 100 | |
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| 101 | #define SET_BEGIN(set) \ |
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| 102 | (&__CONCAT(__start_set_,set)) |
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| 103 | #define SET_LIMIT(set) \ |
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| 104 | (&__CONCAT(__stop_set_,set)) |
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| 105 | #else /* __rtems__ */ |
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| 106 | #define SET_DECLARE(set, ptype) \ |
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[5084ad8] | 107 | extern ptype * const __CONCAT(_bsd__start_set_,set)[]; \ |
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| 108 | extern ptype * const __CONCAT(_bsd__stop_set_,set)[] |
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| 109 | |
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| 110 | #define RWSET_DECLARE(set, ptype) \ |
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| 111 | extern ptype *__CONCAT(_bsd__start_set_,set)[]; \ |
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| 112 | extern ptype *__CONCAT(_bsd__stop_set_,set)[] |
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[a9153ec] | 113 | |
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| 114 | #define SET_BEGIN(set) \ |
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| 115 | (__CONCAT(_bsd__start_set_,set)) |
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| 116 | #define SET_LIMIT(set) \ |
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| 117 | (__CONCAT(_bsd__stop_set_,set)) |
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| 118 | #endif /* __rtems__ */ |
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| 119 | |
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| 120 | /* |
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| 121 | * Iterate over all the elements of a set. |
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| 122 | * |
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| 123 | * Sets always contain addresses of things, and "pvar" points to words |
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| 124 | * containing those addresses. Thus is must be declared as "type **pvar", |
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| 125 | * and the address of each set item is obtained inside the loop by "*pvar". |
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| 126 | */ |
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| 127 | #define SET_FOREACH(pvar, set) \ |
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| 128 | for (pvar = SET_BEGIN(set); pvar < SET_LIMIT(set); pvar++) |
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| 129 | |
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| 130 | #define SET_ITEM(set, i) \ |
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| 131 | ((SET_BEGIN(set))[i]) |
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| 132 | |
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| 133 | /* |
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| 134 | * Provide a count of the items in a set. |
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| 135 | */ |
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| 136 | #define SET_COUNT(set) \ |
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| 137 | (SET_LIMIT(set) - SET_BEGIN(set)) |
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| 138 | |
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[e599318] | 139 | #endif /* _SYS_LINKER_SET_H_ */ |
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