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 <inttypes.h> 38 #include <string.h> 39 40 #include "ef.h" 41 42 #ifdef __powerpc64__ 43 #define PRI_ELF_SIZE PRIu64 44 #else 45 #define PRI_ELF_SIZE PRIu32 46 #endif 47 48 /* 49 * Apply relocations to the values obtained from the file. `relbase' is the 50 * target relocation address of the section, and `dataoff/len' is the region 51 * that is to be relocated, and has been copied to *dest 52 */ 53 int 54 ef_reloc(struct elf_file *ef, const void *reldata, int reltype, Elf_Off relbase, 55 Elf_Off dataoff, size_t len, void *dest) 56 { 57 Elf_Addr *where, addend; 58 Elf32_Addr *where32; 59 Elf_Size rtype, symidx; 60 const Elf_Rela *rela; 61 62 if (reltype != EF_RELOC_RELA) 63 return (EINVAL); 64 65 rela = (const Elf_Rela *)reldata; 66 where = (Elf_Addr *) ((Elf_Off)dest - dataoff + rela->r_offset); 67 where32 = (Elf32_Addr *) ((Elf_Off)dest - dataoff + rela->r_offset); 68 addend = rela->r_addend; 69 rtype = ELF_R_TYPE(rela->r_info); 70 symidx = ELF_R_SYM(rela->r_info); 71 72 if ((char *)where < (char *)dest || (char *)where >= (char *)dest + len) 73 return (0); 74 75 switch (rtype) { 76 case R_PPC_RELATIVE: /* word32|doubleword64 B + A */ 77 *where = relbase + addend; 78 break; 79 case R_PPC_ADDR32: /* word32 S + A */ 80 *where32 = EF_SYMADDR(ef, symidx) + addend; 81 break; 82 #ifdef __powerpc64__ 83 case R_PPC64_ADDR64: /* doubleword64 S + A */ 84 *where = EF_SYMADDR(ef, symidx) + addend; 85 break; 86 #endif 87 default: 88 warnx("unhandled relocation type %" PRI_ELF_SIZE, rtype); 89 } 90 return (0); 91 } 92