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