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 28 #include <sys/endian.h> 29 30 #include <err.h> 31 #include <errno.h> 32 #include <gelf.h> 33 34 #include "kldelf.h" 35 36 /* 37 * Apply relocations to the values obtained from the file. `relbase' is the 38 * target relocation address of the section, and `dataoff/len' is the region 39 * that is to be relocated, and has been copied to *dest 40 */ 41 static int 42 ef_aarch64_reloc(struct elf_file *ef, const void *reldata, Elf_Type reltype, 43 GElf_Addr relbase, GElf_Addr dataoff, size_t len, void *dest) 44 { 45 char *where; 46 GElf_Addr addr, addend; 47 GElf_Size rtype, symidx; 48 const GElf_Rela *rela; 49 50 switch (reltype) { 51 case ELF_T_RELA: 52 rela = (const GElf_Rela *)reldata; 53 where = (char *)dest + (relbase + rela->r_offset - dataoff); 54 addend = rela->r_addend; 55 rtype = GELF_R_TYPE(rela->r_info); 56 symidx = GELF_R_SYM(rela->r_info); 57 break; 58 default: 59 return (EINVAL); 60 } 61 62 if (where < (char *)dest || where >= (char *)dest + len) 63 return (0); 64 65 switch (rtype) { 66 case R_AARCH64_RELATIVE: 67 addr = relbase + addend; 68 le64enc(where, addr); 69 break; 70 case R_AARCH64_ABS64: 71 addr = EF_SYMADDR(ef, symidx) + addend; 72 le64enc(where, addr); 73 break; 74 default: 75 warnx("unhandled relocation type %d", (int)rtype); 76 break; 77 } 78 return (0); 79 } 80 81 ELF_RELOC(ELFCLASS64, ELFDATA2LSB, EM_AARCH64, ef_aarch64_reloc); 82