c1bba4445c
Parse the R_MIPS_32 and R_MIPS_64 relocations. Both Elf_Rel and Elf_Rela relocations are handled since O32 MIPS uses Elf_Rel while N64 uses Elf_Rela. Note that R_MIPS_32 is only handled for 32-bit mips and R_MIPS_64 for 64-bit. N32 is untested. Reviewed by: imp Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D19870
100 lines
3.1 KiB
C
100 lines
3.1 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
|
|
*
|
|
* 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <machine/elf.h>
|
|
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
|
|
#include "ef.h"
|
|
|
|
/*
|
|
* Apply relocations to the values we got from the file. `relbase' is the
|
|
* target relocation address of the section, and `dataoff' is the target
|
|
* relocation address of the data in `dest'.
|
|
*/
|
|
int
|
|
ef_reloc(struct elf_file *ef, const void *reldata, int reltype, Elf_Off relbase,
|
|
Elf_Off dataoff, size_t len, void *dest)
|
|
{
|
|
Elf_Addr *where, val;
|
|
const Elf_Rel *rel;
|
|
const Elf_Rela *rela;
|
|
Elf_Addr addend, addr;
|
|
Elf_Size rtype, symidx;
|
|
|
|
switch (reltype) {
|
|
case EF_RELOC_REL:
|
|
rel = (const Elf_Rel *)reldata;
|
|
where = (Elf_Addr *)((char *)dest + relbase + rel->r_offset -
|
|
dataoff);
|
|
addend = 0;
|
|
rtype = ELF_R_TYPE(rel->r_info);
|
|
symidx = ELF_R_SYM(rel->r_info);
|
|
break;
|
|
case EF_RELOC_RELA:
|
|
rela = (const Elf_Rela *)reldata;
|
|
where = (Elf_Addr *)((char *)dest + relbase + rela->r_offset -
|
|
dataoff);
|
|
addend = rela->r_addend;
|
|
rtype = ELF_R_TYPE(rela->r_info);
|
|
symidx = ELF_R_SYM(rela->r_info);
|
|
break;
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
|
|
if ((char *)where < (char *)dest || (char *)where >= (char *)dest + len)
|
|
return (0);
|
|
|
|
if (reltype == EF_RELOC_REL)
|
|
addend = *where;
|
|
|
|
switch (rtype) {
|
|
#ifdef __LP64__
|
|
case R_MIPS_64: /* S + A */
|
|
#else
|
|
case R_MIPS_32: /* S + A */
|
|
#endif
|
|
addr = EF_SYMADDR(ef, symidx);
|
|
val = addr + addend;
|
|
*where = val;
|
|
break;
|
|
default:
|
|
warnx("unhandled relocation type %d", (int)rtype);
|
|
}
|
|
return (0);
|
|
}
|