1*4312beabSjoerg /* $NetBSD: compat.c,v 1.1 2018/10/17 23:36:58 joerg Exp $ */ 2*4312beabSjoerg /*- 3*4312beabSjoerg * Copyright (c) 2018 The NetBSD Foundation, Inc. 4*4312beabSjoerg * All rights reserved. 5*4312beabSjoerg * 6*4312beabSjoerg * This code is derived from software contributed to The NetBSD Foundation 7*4312beabSjoerg * by Joerg Sonnenberger. 8*4312beabSjoerg * 9*4312beabSjoerg * Redistribution and use in source and binary forms, with or without 10*4312beabSjoerg * modification, are permitted provided that the following conditions 11*4312beabSjoerg * are met: 12*4312beabSjoerg * 1. Redistributions of source code must retain the above copyright 13*4312beabSjoerg * notice, this list of conditions and the following disclaimer. 14*4312beabSjoerg * 2. Redistributions in binary form must reproduce the above copyright 15*4312beabSjoerg * notice, this list of conditions and the following disclaimer in the 16*4312beabSjoerg * documentation and/or other materials provided with the distribution. 17*4312beabSjoerg * 18*4312beabSjoerg * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19*4312beabSjoerg * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20*4312beabSjoerg * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21*4312beabSjoerg * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22*4312beabSjoerg * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23*4312beabSjoerg * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24*4312beabSjoerg * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25*4312beabSjoerg * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26*4312beabSjoerg * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27*4312beabSjoerg * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28*4312beabSjoerg * POSSIBILITY OF SUCH DAMAGE. 29*4312beabSjoerg */ 30*4312beabSjoerg 31*4312beabSjoerg /* 32*4312beabSjoerg * Early ELF support in NetBSD up to April 2nd, 2000 exposed dlopen and 33*4312beabSjoerg * friends via function pointers in the main object that is passed to the 34*4312beabSjoerg * startup code in crt0.o. Later versions kept the magic and version number 35*4312beabSjoerg * checks, but depend on normal symbol interposition to get the symbols from 36*4312beabSjoerg * rtld. The compatibility object build here contains just enough fields to 37*4312beabSjoerg * make either routine happy without polluting the rest of rtld. 38*4312beabSjoerg */ 39*4312beabSjoerg 40*4312beabSjoerg #include <sys/cdefs.h> 41*4312beabSjoerg __RCSID("$NetBSD: compat.c,v 1.1 2018/10/17 23:36:58 joerg Exp $"); 42*4312beabSjoerg 43*4312beabSjoerg #include "rtld.h" 44*4312beabSjoerg 45*4312beabSjoerg #if defined(__alpha__) 46*4312beabSjoerg #define RTLD_OBJ_DLOPEN_OFFSET 264 47*4312beabSjoerg #elif defined(__i386__) 48*4312beabSjoerg #define RTLD_OBJ_DLOPEN_OFFSET 140 49*4312beabSjoerg #elif defined(__mips) && defined(_ABIO32) 50*4312beabSjoerg /* The MIPS legacy support is required for O32 only, N32 is not affected. */ 51*4312beabSjoerg #define RTLD_OBJ_DLOPEN_OFFSET 152 52*4312beabSjoerg #elif defined(__powerpc__) && !defined(__powerpc64__) 53*4312beabSjoerg /* Only 32bit PowerPC is affected. */ 54*4312beabSjoerg #define RTLD_OBJ_DLOPEN_OFFSET 140 55*4312beabSjoerg #elif defined(__sparc) && !defined(__sparc64__) 56*4312beabSjoerg /* Only 32bit SPARC is affected, 64bit SPARC ELF support was incomplete. */ 57*4312beabSjoerg #define RTLD_OBJ_DLOPEN_OFFSET 140 58*4312beabSjoerg #endif 59*4312beabSjoerg 60*4312beabSjoerg #define RTLD_MAGIC 0xd550b87a 61*4312beabSjoerg #define RTLD_VERSION 1 62*4312beabSjoerg 63*4312beabSjoerg #ifdef RTLD_OBJ_DLOPEN_OFFSET 64*4312beabSjoerg const uintptr_t _rtld_compat_obj[] = { 65*4312beabSjoerg # ifdef _LP64 66*4312beabSjoerg # if BYTE_ORDER == BIG_ENDIAN 67*4312beabSjoerg [0] = (((uint64_t)RTLD_MAGIC) << 32) | RTLD_VERSION, 68*4312beabSjoerg # else 69*4312beabSjoerg [0] = (((uint64_t)RTLD_VERSION) << 32) | RTLD_MAGIC, 70*4312beabSjoerg # endif 71*4312beabSjoerg # else 72*4312beabSjoerg [0] = RTLD_MAGIC, 73*4312beabSjoerg [1] = RTLD_VERSION, 74*4312beabSjoerg # endif 75*4312beabSjoerg [(RTLD_OBJ_DLOPEN_OFFSET / sizeof(uintptr_t)) + 0] = (uintptr_t)dlopen, 76*4312beabSjoerg [(RTLD_OBJ_DLOPEN_OFFSET / sizeof(uintptr_t)) + 1] = (uintptr_t)dlsym, 77*4312beabSjoerg [(RTLD_OBJ_DLOPEN_OFFSET / sizeof(uintptr_t)) + 2] = (uintptr_t)dlerror, 78*4312beabSjoerg [(RTLD_OBJ_DLOPEN_OFFSET / sizeof(uintptr_t)) + 3] = (uintptr_t)dlclose, 79*4312beabSjoerg [(RTLD_OBJ_DLOPEN_OFFSET / sizeof(uintptr_t)) + 4] = (uintptr_t)dladdr, 80*4312beabSjoerg }; 81*4312beabSjoerg #else 82*4312beabSjoerg const uintptr_t _rtld_compat_obj[] = { 83*4312beabSjoerg # ifdef _LP64 84*4312beabSjoerg # if BYTE_ORDER == BIG_ENDIAN 85*4312beabSjoerg [0] = (((uint64_t)RTLD_MAGIC) << 32) | RTLD_VERSION, 86*4312beabSjoerg # else 87*4312beabSjoerg [0] = (((uint64_t)RTLD_VERSION) << 32) | RTLD_MAGIC, 88*4312beabSjoerg # endif 89*4312beabSjoerg # else 90*4312beabSjoerg [0] = RTLD_MAGIC, 91*4312beabSjoerg [1] = RTLD_VERSION, 92*4312beabSjoerg # endif 93*4312beabSjoerg }; 94*4312beabSjoerg #endif /* RTLD_OBJ_DLOPEN_OFFSET */ 95