1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 30 #include <sys/endian.h> 31 32 #include <err.h> 33 #include <errno.h> 34 #include <gelf.h> 35 36 #include "ef.h" 37 38 /* 39 * Apply relocations to the values obtained from the file. `relbase' is the 40 * target relocation address of the section, and `dataoff/len' is the region 41 * that is to be relocated, and has been copied to *dest 42 */ 43 static int 44 ef_ppc_reloc(struct elf_file *ef, const void *reldata, Elf_Type reltype, 45 GElf_Addr relbase, GElf_Addr dataoff, size_t len, void *dest) 46 { 47 char *where; 48 GElf_Addr addr, addend; 49 GElf_Size rtype, symidx; 50 const GElf_Rela *rela; 51 52 switch (reltype) { 53 case ELF_T_RELA: 54 rela = (const GElf_Rela *)reldata; 55 where = (char *)dest + (relbase + rela->r_offset - dataoff); 56 addend = rela->r_addend; 57 rtype = GELF_R_TYPE(rela->r_info); 58 symidx = GELF_R_SYM(rela->r_info); 59 break; 60 default: 61 return (EINVAL); 62 } 63 64 if (where < (char *)dest || where >= (char *)dest + len) 65 return (0); 66 67 switch (rtype) { 68 case R_PPC_RELATIVE: /* word32|doubleword64 B + A */ 69 addr = relbase + addend; 70 if (elf_class(ef) == ELFCLASS64) { 71 if (elf_encoding(ef) == ELFDATA2LSB) 72 le64enc(where, addr); 73 else 74 be64enc(where, addr); 75 } else 76 be32enc(where, addr); 77 break; 78 case R_PPC_ADDR32: /* word32 S + A */ 79 addr = EF_SYMADDR(ef, symidx) + addend; 80 be32enc(where, addr); 81 break; 82 case R_PPC64_ADDR64: /* doubleword64 S + A */ 83 addr = EF_SYMADDR(ef, symidx) + addend; 84 if (elf_encoding(ef) == ELFDATA2LSB) 85 le64enc(where, addr); 86 else 87 be64enc(where, addr); 88 break; 89 default: 90 warnx("unhandled relocation type %d", (int)rtype); 91 } 92 return (0); 93 } 94 95 ELF_RELOC(ELFCLASS32, ELFDATA2MSB, EM_PPC, ef_ppc_reloc); 96 ELF_RELOC(ELFCLASS64, ELFDATA2LSB, EM_PPC64, ef_ppc_reloc); 97 ELF_RELOC(ELFCLASS64, ELFDATA2MSB, EM_PPC64, ef_ppc_reloc); 98