1 /*- 2 * Copyright (c) 2005 Peter Grehan. 3 * Copyright 1996-1998 John D. Polstra. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * $FreeBSD$ 28 */ 29 30 #include <sys/types.h> 31 #include <machine/elf.h> 32 33 #include <err.h> 34 #include <errno.h> 35 #include <string.h> 36 37 #include "ef.h" 38 39 #include <stdio.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, addr, addend; 51 Elf_Word rtype, symidx; 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 symidx = ELF_R_SYM(rela->r_info); 62 63 if ((char *)where < (char *)dest || (char *)where >= (char *)dest + len) 64 return (0); 65 66 switch(rtype) { 67 case R_PPC_RELATIVE: /* word32 B + A */ 68 *where = relbase + addend; 69 break; 70 default: 71 warnx("unhandled relocation type %d", rtype); 72 } 73 return (0); 74 } 75