1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #ifndef _SGSRTCID_H 27 #define _SGSRTCID_H 28 29 #ifdef __cplusplus 30 extern "C" { 31 #endif 32 33 34 /* 35 * This file defines the Rtc_id structure that is found at the beginning 36 * of linker configuration files. It resides at this level so that 37 * it can be accessed by file(1) as well as by crle(1) and the 38 * runtime linker (ld.so.1). The rest of the data structures for 39 * config files are found in usr/src/cmd/sgs/include/rtc.h 40 * 41 * The use of sizeof(char) data (no byte order issue) and explicit 42 * padding in the definition of Rtc_id ensures that it will have 43 * exactly the same layout on all systems, and will have a 44 * size of 16 bytes. The same layout means all systems can read it. 45 * the same size means that any data can be safely placed immediately 46 * following it, without the need for alignment. 47 */ 48 49 /* 50 * Identification header. 51 */ 52 typedef struct { 53 uchar_t id_magic0; /* RTC_ID_MAG0 */ 54 uchar_t id_magic1; /* RTC_ID_MAG1 */ 55 uchar_t id_magic2; /* RTC_ID_MAG2 */ 56 uchar_t id_magic3; /* RTC_ID_MAG0 */ 57 uchar_t id_class; /* File class/capacity (ELFCLASS constant) */ 58 uchar_t id_data; /* Data encoding (ELFDATA constant) */ 59 uchar_t id_machine; /* Architecture (ELF EM_ constant) */ 60 uchar_t id_pad[9]; /* Ensure size is 16 bytes */ 61 } Rtc_id; 62 63 #define RTC_ID_MAG0 '\077' /* ? */ 64 #define RTC_ID_MAG1 'R' /* Runtime */ 65 #define RTC_ID_MAG2 'L' /* Linker */ 66 #define RTC_ID_MAG3 'C' /* Configuration */ 67 68 /* 69 * Ensure that the largest machine constant will not grow beyond 70 * maximum value representable by an unsigned byte without our 71 * being alerted to it. 72 */ 73 #if EM_NUM > 256 74 #error "Maximum machine constant size exceeded. Format requires revision." 75 #endif 76 77 /* 78 * Check the 4 bytes starting at the given address to see if 79 * they contain the Rtc_id magic number. The type of the address 80 * is unimportant as long as it is valid, because RTC_ID_TEST() 81 * will cast it to (uchar_t *). 82 */ 83 #define RTC_ID_TEST(addr) \ 84 ((RTC_ID_MAG0 == *((uchar_t *)addr)) && \ 85 (RTC_ID_MAG1 == *(((uchar_t *)addr) + 1)) && \ 86 (RTC_ID_MAG2 == *(((uchar_t *)addr) + 2)) && \ 87 (RTC_ID_MAG3 == *(((uchar_t *)addr) + 3))) 88 89 #ifdef __cplusplus 90 } 91 #endif 92 93 #endif /* _SGSRTCID_H */ 94