95 lines
3.6 KiB
C
95 lines
3.6 KiB
C
/* $NetBSD: compat.c,v 1.1 2018/10/17 23:36:58 joerg Exp $ */
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/*-
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* Copyright (c) 2018 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Joerg Sonnenberger.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Early ELF support in NetBSD up to April 2nd, 2000 exposed dlopen and
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* friends via function pointers in the main object that is passed to the
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* startup code in crt0.o. Later versions kept the magic and version number
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* checks, but depend on normal symbol interposition to get the symbols from
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* rtld. The compatibility object build here contains just enough fields to
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* make either routine happy without polluting the rest of rtld.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: compat.c,v 1.1 2018/10/17 23:36:58 joerg Exp $");
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#include "rtld.h"
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#if defined(__alpha__)
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#define RTLD_OBJ_DLOPEN_OFFSET 264
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#elif defined(__i386__)
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#define RTLD_OBJ_DLOPEN_OFFSET 140
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#elif defined(__mips) && defined(_ABIO32)
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/* The MIPS legacy support is required for O32 only, N32 is not affected. */
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#define RTLD_OBJ_DLOPEN_OFFSET 152
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#elif defined(__powerpc__) && !defined(__powerpc64__)
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/* Only 32bit PowerPC is affected. */
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#define RTLD_OBJ_DLOPEN_OFFSET 140
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#elif defined(__sparc) && !defined(__sparc64__)
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/* Only 32bit SPARC is affected, 64bit SPARC ELF support was incomplete. */
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#define RTLD_OBJ_DLOPEN_OFFSET 140
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#endif
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#define RTLD_MAGIC 0xd550b87a
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#define RTLD_VERSION 1
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#ifdef RTLD_OBJ_DLOPEN_OFFSET
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const uintptr_t _rtld_compat_obj[] = {
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# ifdef _LP64
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# if BYTE_ORDER == BIG_ENDIAN
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[0] = (((uint64_t)RTLD_MAGIC) << 32) | RTLD_VERSION,
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# else
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[0] = (((uint64_t)RTLD_VERSION) << 32) | RTLD_MAGIC,
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# endif
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# else
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[0] = RTLD_MAGIC,
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[1] = RTLD_VERSION,
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# endif
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[(RTLD_OBJ_DLOPEN_OFFSET / sizeof(uintptr_t)) + 0] = (uintptr_t)dlopen,
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[(RTLD_OBJ_DLOPEN_OFFSET / sizeof(uintptr_t)) + 1] = (uintptr_t)dlsym,
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[(RTLD_OBJ_DLOPEN_OFFSET / sizeof(uintptr_t)) + 2] = (uintptr_t)dlerror,
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[(RTLD_OBJ_DLOPEN_OFFSET / sizeof(uintptr_t)) + 3] = (uintptr_t)dlclose,
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[(RTLD_OBJ_DLOPEN_OFFSET / sizeof(uintptr_t)) + 4] = (uintptr_t)dladdr,
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};
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#else
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const uintptr_t _rtld_compat_obj[] = {
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# ifdef _LP64
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# if BYTE_ORDER == BIG_ENDIAN
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[0] = (((uint64_t)RTLD_MAGIC) << 32) | RTLD_VERSION,
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# else
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[0] = (((uint64_t)RTLD_VERSION) << 32) | RTLD_MAGIC,
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# endif
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# else
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[0] = RTLD_MAGIC,
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[1] = RTLD_VERSION,
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# endif
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};
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#endif /* RTLD_OBJ_DLOPEN_OFFSET */
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