1c88f7d8fSJessica Clarke /*- 2c88f7d8fSJessica Clarke * SPDX-License-Identifier: BSD-2-Clause 3c88f7d8fSJessica Clarke * 4c88f7d8fSJessica Clarke * Copyright (c) 2003 Jake Burkholder. 5c88f7d8fSJessica Clarke * Copyright 1996-1998 John D. Polstra. 6c88f7d8fSJessica Clarke * All rights reserved. 7c88f7d8fSJessica Clarke * Copyright (c) 2023 Jessica Clarke <jrtc27@FreeBSD.org> 8c88f7d8fSJessica Clarke * 9c88f7d8fSJessica Clarke * Redistribution and use in source and binary forms, with or without 10c88f7d8fSJessica Clarke * modification, are permitted provided that the following conditions 11c88f7d8fSJessica Clarke * are met: 12c88f7d8fSJessica Clarke * 1. Redistributions of source code must retain the above copyright 13c88f7d8fSJessica Clarke * notice, this list of conditions and the following disclaimer. 14c88f7d8fSJessica Clarke * 2. Redistributions in binary form must reproduce the above copyright 15c88f7d8fSJessica Clarke * notice, this list of conditions and the following disclaimer in the 16c88f7d8fSJessica Clarke * documentation and/or other materials provided with the distribution. 17c88f7d8fSJessica Clarke * 18c88f7d8fSJessica Clarke * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19c88f7d8fSJessica Clarke * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20c88f7d8fSJessica Clarke * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21c88f7d8fSJessica Clarke * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22c88f7d8fSJessica Clarke * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23c88f7d8fSJessica Clarke * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24c88f7d8fSJessica Clarke * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25c88f7d8fSJessica Clarke * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26c88f7d8fSJessica Clarke * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27c88f7d8fSJessica Clarke * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28c88f7d8fSJessica Clarke * SUCH DAMAGE. 29c88f7d8fSJessica Clarke */ 30c88f7d8fSJessica Clarke 31c88f7d8fSJessica Clarke #include <sys/endian.h> 32c88f7d8fSJessica Clarke 33c88f7d8fSJessica Clarke #include <err.h> 34c88f7d8fSJessica Clarke #include <errno.h> 35c88f7d8fSJessica Clarke #include <gelf.h> 36c88f7d8fSJessica Clarke 37c88f7d8fSJessica Clarke #include "ef.h" 38c88f7d8fSJessica Clarke 39c88f7d8fSJessica Clarke /* 40c88f7d8fSJessica Clarke * Apply relocations to the values we got from the file. `relbase' is the 41c88f7d8fSJessica Clarke * target relocation address of the section, and `dataoff' is the target 42c88f7d8fSJessica Clarke * relocation address of the data in `dest'. 43c88f7d8fSJessica Clarke */ 44c88f7d8fSJessica Clarke static int 45c88f7d8fSJessica Clarke ef_arm_reloc(struct elf_file *ef, const void *reldata, Elf_Type reltype, 46c88f7d8fSJessica Clarke GElf_Addr relbase, GElf_Addr dataoff, size_t len, void *dest) 47c88f7d8fSJessica Clarke { 48c88f7d8fSJessica Clarke char *where; 49c88f7d8fSJessica Clarke GElf_Addr addr, addend; 50c88f7d8fSJessica Clarke GElf_Size rtype, symidx; 51c88f7d8fSJessica Clarke const GElf_Rel *rel; 52c88f7d8fSJessica Clarke const GElf_Rela *rela; 53c88f7d8fSJessica Clarke 54c88f7d8fSJessica Clarke switch (reltype) { 55c88f7d8fSJessica Clarke case ELF_T_REL: 56c88f7d8fSJessica Clarke rel = (const GElf_Rel *)reldata; 57c88f7d8fSJessica Clarke where = (char *)dest + relbase + rel->r_offset - dataoff; 58c88f7d8fSJessica Clarke addend = 0; 59c88f7d8fSJessica Clarke rtype = GELF_R_TYPE(rel->r_info); 60c88f7d8fSJessica Clarke symidx = GELF_R_SYM(rel->r_info); 61c88f7d8fSJessica Clarke break; 62c88f7d8fSJessica Clarke case ELF_T_RELA: 63c88f7d8fSJessica Clarke rela = (const GElf_Rela *)reldata; 64c88f7d8fSJessica Clarke where = (char *)dest + relbase + rela->r_offset - dataoff; 65c88f7d8fSJessica Clarke addend = rela->r_addend; 66c88f7d8fSJessica Clarke rtype = GELF_R_TYPE(rela->r_info); 67c88f7d8fSJessica Clarke symidx = GELF_R_SYM(rela->r_info); 68c88f7d8fSJessica Clarke break; 69c88f7d8fSJessica Clarke default: 70c88f7d8fSJessica Clarke return (EINVAL); 71c88f7d8fSJessica Clarke } 72c88f7d8fSJessica Clarke 73c88f7d8fSJessica Clarke if (where < (char *)dest || where >= (char *)dest + len) 74c88f7d8fSJessica Clarke return (0); 75c88f7d8fSJessica Clarke 76c88f7d8fSJessica Clarke if (reltype == ELF_T_REL) 77c88f7d8fSJessica Clarke addend = le32dec(where); 78c88f7d8fSJessica Clarke 79c88f7d8fSJessica Clarke switch (rtype) { 80c88f7d8fSJessica Clarke case R_ARM_ABS32: /* S + A */ 81c88f7d8fSJessica Clarke addr = EF_SYMADDR(ef, symidx) + addend; 82c88f7d8fSJessica Clarke le32enc(where, addr); 83c88f7d8fSJessica Clarke break; 84c88f7d8fSJessica Clarke case R_ARM_RELATIVE: /* B + A */ 85c88f7d8fSJessica Clarke addr = addend + relbase; 86c88f7d8fSJessica Clarke le32enc(where, addr); 87c88f7d8fSJessica Clarke break; 88c88f7d8fSJessica Clarke default: 89c88f7d8fSJessica Clarke warnx("unhandled relocation type %d", (int)rtype); 90c88f7d8fSJessica Clarke } 91c88f7d8fSJessica Clarke return (0); 92c88f7d8fSJessica Clarke } 93c88f7d8fSJessica Clarke 94c88f7d8fSJessica Clarke ELF_RELOC(ELFCLASS32, ELFDATA2LSB, EM_ARM, ef_arm_reloc); 95