Return to linker_set.h CVS log

Up to [Apple XNU] / XNU / bsd / sys

Annotation of XNU/bsd/sys/linker_set.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*-
        !            23:  * Copyright (c) 1999 John D. Polstra
        !            24:  * All rights reserved.
        !            25:  *
        !            26:  * Redistribution and use in source and binary forms, with or without
        !            27:  * modification, are permitted provided that the following conditions
        !            28:  * are met:
        !            29:  * 1. Redistributions of source code must retain the above copyright
        !            30:  *    notice, this list of conditions and the following disclaimer.
        !            31:  * 2. Redistributions in binary form must reproduce the above copyright
        !            32:  *    notice, this list of conditions and the following disclaimer in the
        !            33:  *    documentation and/or other materials provided with the distribution.
        !            34:  *
        !            35:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
        !            36:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            37:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            38:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
        !            39:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            40:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            41:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            42:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            43:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            44:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            45:  * SUCH DAMAGE.
        !            46:  *
        !            47:  */
        !            48: 
        !            49: #ifndef _SYS_LINKER_SET_H_
        !            50: #define _SYS_LINKER_SET_H_
        !            51: 
        !            52: /*
        !            53:  * The following macros are used to declare global sets of objects, which
        !            54:  * are collected by the linker into a `struct linker_set' as defined below.
        !            55:  * For ELF, this is done by constructing a separate segment for each set.
        !            56:  * For a.out, it is done automatically by the linker.
        !            57:  */
        !            58: 
        !            59: #define __ELF__
        !            60: #ifdef __ELF__
        !            61: 
        !            62: #define MAKE_SET(seg, set, sym)                                                \
        !            63:        static void const * const __set_##set##_sym_##sym = &sym;       \
        !            64:        __asm(".section  seg, " #set "");       \
        !            65:        __asm(".long " #sym);                                           
        !            66: 
        !            67: /*     __asm(".previous") */
        !            68: 
        !            69: 
        !            70: #define TEXT_SET(set, sym) MAKE_SET(__TEXT, set, sym)
        !            71: #define DATA_SET(set, sym) MAKE_SET(__DATA, set, sym)
        !            72: #define BSS_SET(set, sym)  MAKE_SET(__BSS,  set, sym)
        !            73: #define ABS_SET(set, sym)  MAKE_SET(__ABS,  set, sym)
        !            74: 
        !            75: #else
        !            76: 
        !            77: /*
        !            78:  * NB: the constants defined below must match those defined in
        !            79:  * nlist.h.  Since their calculation requires arithmetic, we
        !            80:  * can't name them symbolically (e.g., 7 is N_DATA | N_EXT).
        !            81:  */
        !            82: #define MAKE_SET(set, sym, type) \
        !            83:        static void const * const __set_##set##_sym_##sym = &sym; \
        !            84:        __asm(".stabs \"_" #set "\", " #type ", 0, 0, _" #sym)
        !            85: 
        !            86: #define TEXT_SET(set, sym) MAKE_SET(set, sym, 5)
        !            87: #define DATA_SET(set, sym) MAKE_SET(set, sym, 7)
        !            88: #define BSS_SET(set, sym)  MAKE_SET(set, sym, 9)
        !            89: #define ABS_SET(set, sym)  MAKE_SET(set, sym, 3)
        !            90: 
        !            91: #endif
        !            92: 
        !            93: struct linker_set {
        !            94:        int             ls_length;
        !            95:        const void      *ls_items[1];           /* really ls_length of them,
        !            96:                                                 * trailing NULL */
        !            97: };
        !            98: 
        !            99: #endif /* _SYS_LINKER_SET_H_ */
        !           100: 

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.