117 lines
3.7 KiB
C
117 lines
3.7 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2019 John Baldwin <jhb@FreeBSD.org>
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*
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* This software was developed by SRI International and the University of
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* Cambridge Computer Laboratory (Department of Computer Science and
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* Technology) under DARPA contract HR0011-18-C-0016 ("ECATS"), as part of the
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* DARPA SSITH research programme.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/endian.h>
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#include <err.h>
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#include <errno.h>
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#include <gelf.h>
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#include "ef.h"
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/*
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* Apply relocations to the values obtained from the file. `relbase' is the
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* target relocation address of the section, and `dataoff/len' is the region
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* that is to be relocated, and has been copied to *dest
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*/
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static int
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ef_mips_reloc(struct elf_file *ef, const void *reldata, Elf_Type reltype,
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GElf_Addr relbase, GElf_Addr dataoff, size_t len, void *dest)
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{
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char *where;
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GElf_Addr addr, addend;
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GElf_Size rtype, symidx;
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const GElf_Rel *rel;
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const GElf_Rela *rela;
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switch (reltype) {
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case ELF_T_REL:
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rel = (const GElf_Rel *)reldata;
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where = (char *)dest + (relbase + rel->r_offset - dataoff);
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addend = 0;
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rtype = GELF_R_TYPE(rel->r_info);
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symidx = GELF_R_SYM(rel->r_info);
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break;
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case ELF_T_RELA:
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rela = (const GElf_Rela *)reldata;
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where = (char *)dest + (relbase + rela->r_offset - dataoff);
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addend = rela->r_addend;
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rtype = GELF_R_TYPE(rela->r_info);
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symidx = GELF_R_SYM(rela->r_info);
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break;
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default:
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return (EINVAL);
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}
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if (where < (char *)dest || where >= (char *)dest + len)
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return (0);
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if (reltype == ELF_T_REL) {
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if (elf_class(ef) == ELFCLASS64) {
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if (elf_encoding(ef) == ELFDATA2LSB)
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addend = le64dec(where);
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else
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addend = be64dec(where);
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} else {
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if (elf_encoding(ef) == ELFDATA2LSB)
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addend = le32dec(where);
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else
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addend = be32dec(where);
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}
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}
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switch (rtype) {
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case R_MIPS_64: /* S + A */
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addr = EF_SYMADDR(ef, symidx) + addend;
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if (elf_encoding(ef) == ELFDATA2LSB)
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le64enc(where, addr);
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else
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be64enc(where, addr);
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break;
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case R_MIPS_32: /* S + A */
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addr = EF_SYMADDR(ef, symidx) + addend;
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if (elf_encoding(ef) == ELFDATA2LSB)
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le32enc(where, addr);
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else
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be32enc(where, addr);
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break;
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default:
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warnx("unhandled relocation type %d", (int)rtype);
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}
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return (0);
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}
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ELF_RELOC(ELFCLASS32, ELFDATA2LSB, EM_MIPS, ef_mips_reloc);
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ELF_RELOC(ELFCLASS32, ELFDATA2MSB, EM_MIPS, ef_mips_reloc);
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ELF_RELOC(ELFCLASS64, ELFDATA2LSB, EM_MIPS, ef_mips_reloc);
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ELF_RELOC(ELFCLASS64, ELFDATA2MSB, EM_MIPS, ef_mips_reloc);
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