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kldxref: Add arm support

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This commit is contained in:
Jessica Clarke 2023-12-14 18:27:09 +00:00
parent ada9d12f95
commit c88f7d8fb5
2 changed files with 95 additions and 0 deletions
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1
usr.sbin/kldxref/Makefile
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@ -4,6 +4,7 @@ PROG= kldxref
MAN= kldxref.8
SRCS= kldxref.c ef.c ef_obj.c elf.c
SRCS+= ef_aarch64.c \
ef_arm.c \
ef_amd64.c \
ef_i386.c \
ef_mips.c \

94
usr.sbin/kldxref/ef_arm.c Normal file
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@ -0,0 +1,94 @@
/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2003 Jake Burkholder.
* Copyright 1996-1998 John D. Polstra.
* All rights reserved.
* Copyright (c) 2023 Jessica Clarke <jrtc27@FreeBSD.org>
*
* 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 "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'.
*/
static int
ef_arm_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)
addend = le32dec(where);
switch (rtype) {
case R_ARM_ABS32: /* S + A */
addr = EF_SYMADDR(ef, symidx) + addend;
le32enc(where, addr);
break;
case R_ARM_RELATIVE: /* B + A */
addr = addend + relbase;
le32enc(where, addr);
break;
default:
warnx("unhandled relocation type %d", (int)rtype);
}
return (0);
}
ELF_RELOC(ELFCLASS32, ELFDATA2LSB, EM_ARM, ef_arm_reloc);