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

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.