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: src/sys/sys/linker_set.h,v 1.13 2002/09/23 06:11:29 peter Exp $ |
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28 | */ |
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29 | |
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30 | #ifndef _SYS_LINKER_SET_H_ |
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31 | #define _SYS_LINKER_SET_H_ |
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32 | |
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33 | /* |
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34 | * The following macros are used to declare global sets of objects, which |
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35 | * are collected by the linker into a `linker_set' as defined below. |
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36 | * For ELF, this is done by constructing a separate segment for each set. |
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37 | */ |
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38 | |
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39 | /* |
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40 | * Private macros, not to be used outside this header file. |
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41 | */ |
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42 | #ifdef __GNUC__ |
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43 | #define __MAKE_SET(set, sym) \ |
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44 | static void const * const __set_##set##_sym_##sym \ |
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45 | __attribute((section("set_" #set))) __used = &sym |
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46 | #else /* !__GNUC__ */ |
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47 | #ifndef lint |
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48 | #error "This file needs to be compiled by GCC or lint" |
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49 | #endif /* lint */ |
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50 | #define __MAKE_SET(set, sym) extern void const * const (__set_##set##_sym_##sym) |
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51 | #endif /* __GNUC__ */ |
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52 | |
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53 | /* |
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54 | * Public macros. |
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55 | */ |
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56 | #define TEXT_SET(set, sym) __MAKE_SET(set, sym) |
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57 | #define DATA_SET(set, sym) __MAKE_SET(set, sym) |
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58 | #define BSS_SET(set, sym) __MAKE_SET(set, sym) |
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59 | #define ABS_SET(set, sym) __MAKE_SET(set, sym) |
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60 | #define SET_ENTRY(set, sym) __MAKE_SET(set, sym) |
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61 | |
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62 | /* |
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63 | * Initialize before referring to a give linker set |
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64 | */ |
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65 | #define SET_DECLARE(set, ptype) \ |
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66 | extern ptype *__CONCAT(__start_set_,set)[]; \ |
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67 | extern ptype *__CONCAT(__stop_set_,set)[] |
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68 | |
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69 | #define SET_BEGIN(set) \ |
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70 | (__CONCAT(__start_set_,set)) |
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71 | #define SET_LIMIT(set) \ |
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72 | (__CONCAT(__stop_set_,set)) |
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73 | |
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74 | /* |
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75 | * Iterate over all the elements of a set. |
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76 | * |
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77 | * Sets always contain addresses of things, and "pvar" points to words |
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78 | * containing those addresses. Thus is must be declared as "type **pvar", |
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79 | * and the address of each set item is obtained inside the loop by "*pvar". |
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80 | */ |
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81 | #define SET_FOREACH(pvar, set) \ |
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82 | for (pvar = SET_BEGIN(set); pvar < SET_LIMIT(set); pvar++) |
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83 | |
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84 | #define SET_ITEM(set, i) \ |
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85 | ((SET_BEGIN(set))[i]) |
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86 | |
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87 | /* |
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88 | * Provide a count of the items in a set. |
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89 | */ |
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90 | #define SET_COUNT(set) \ |
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91 | (SET_LIMIT(set) - SET_BEGIN(set)) |
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92 | |
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93 | #endif /* _SYS_LINKER_SET_H_ */ |
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