1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2005 Peter Grehan. 5 * Copyright 1996-1998 John D. Polstra. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 32 #include <sys/types.h> 33 #include <machine/elf.h> 34 35 #include <err.h> 36 #include <errno.h> 37 #include <string.h> 38 39 #include "ef.h" 40 41 /* 42 * Apply relocations to the values obtained from the file. `relbase' is the 43 * target relocation address of the section, and `dataoff/len' is the region 44 * that is to be relocated, and has been copied to *dest 45 */ 46 int 47 ef_reloc(struct elf_file *ef, const void *reldata, int reltype, Elf_Off relbase, 48 Elf_Off dataoff, size_t len, void *dest) 49 { 50 Elf_Addr *where, addend; 51 Elf_Size rtype; 52 const Elf_Rela *rela; 53 54 if (reltype != EF_RELOC_RELA) 55 return (EINVAL); 56 57 rela = (const Elf_Rela *)reldata; 58 where = (Elf_Addr *) ((Elf_Off)dest - dataoff + rela->r_offset); 59 addend = rela->r_addend; 60 rtype = ELF_R_TYPE(rela->r_info); 61 62 if ((char *)where < (char *)dest || (char *)where >= (char *)dest + len) 63 return (0); 64 65 switch (rtype) { 66 case R_PPC_RELATIVE: /* word32 B + A */ 67 *where = relbase + addend; 68 break; 69 default: 70 warnx("unhandled relocation type %lu", rtype); 71 } 72 return (0); 73 } 74