1/*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2018 John Baldwin <jhb@FreeBSD.org> 5 * 6 * This software was developed by SRI International and the University of 7 * Cambridge Computer Laboratory (Department of Computer Science and 8 * Technology) under DARPA contract HR0011-18-C-0016 ("ECATS"), as part of the 9 * DARPA SSITH research programme. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33#include <sys/cdefs.h> 34__FBSDID("$FreeBSD$"); 35 36#include <sys/types.h> 37#include <machine/elf.h> 38 39#include <err.h> 40#include <errno.h> 41 42#include "ef.h" 43 44int 45ef_reloc(struct elf_file *ef, const void *reldata, int reltype, Elf_Off relbase, 46 Elf_Off dataoff, size_t len, void *dest) 47{ 48 Elf_Addr *where, val; 49 const Elf_Rela *rela; 50 Elf_Addr addend, addr; 51 Elf_Size rtype; 52 53 switch (reltype) { 54 case EF_RELOC_RELA: 55 rela = (const Elf_Rela *)reldata; 56 where = (Elf_Addr *)((char *)dest + relbase + rela->r_offset - 57 dataoff); 58 addend = rela->r_addend; 59 rtype = ELF_R_TYPE(rela->r_info); 60 break; 61 default: 62 return (EINVAL); 63 } 64 65 if ((char *)where < (char *)dest || (char *)where >= (char *)dest + len) 66 return (0); 67 68 switch (rtype) { 69 case R_RISCV_RELATIVE: /* B + A */ 70 addr = addend + relbase; 71 val = addr; 72 *where = val; 73 break; 74 default: 75 warnx("unhandled relocation type %d", (int)rtype); 76 } 77 return (0); 78} 79