100 lines
3.1 KiB
C
100 lines
3.1 KiB
C
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/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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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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* $FreeBSD$
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*/
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#include <sys/types.h>
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#include <machine/elf.h>
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#include <err.h>
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#include <errno.h>
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#include "ef.h"
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/*
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* Apply relocations to the values we got from the file. `relbase' is the
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* target relocation address of the section, and `dataoff' is the target
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* relocation address of the data in `dest'.
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*/
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int
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ef_reloc(struct elf_file *ef, const void *reldata, int reltype, Elf_Off relbase,
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Elf_Off dataoff, size_t len, void *dest)
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{
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Elf_Addr *where, val;
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const Elf_Rel *rel;
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const Elf_Rela *rela;
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Elf_Addr addend, addr;
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Elf_Size rtype, symidx;
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switch (reltype) {
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case EF_RELOC_REL:
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rel = (const Elf_Rel *)reldata;
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where = (Elf_Addr *)((char *)dest + relbase + rel->r_offset -
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dataoff);
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addend = 0;
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rtype = ELF_R_TYPE(rel->r_info);
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symidx = ELF_R_SYM(rel->r_info);
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break;
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case EF_RELOC_RELA:
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rela = (const Elf_Rela *)reldata;
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where = (Elf_Addr *)((char *)dest + relbase + rela->r_offset -
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dataoff);
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addend = rela->r_addend;
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rtype = ELF_R_TYPE(rela->r_info);
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symidx = ELF_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 ((char *)where < (char *)dest || (char *)where >= (char *)dest + len)
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return (0);
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if (reltype == EF_RELOC_REL)
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addend = *where;
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switch (rtype) {
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#ifdef __LP64__
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case R_MIPS_64: /* S + A */
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#else
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case R_MIPS_32: /* S + A */
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#endif
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addr = EF_SYMADDR(ef, symidx);
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val = addr + addend;
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*where = val;
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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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