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freebsd_amp_hwpstate/usr.sbin/kldxref/ef_mips.c

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Parse MIPS relocations to unbreak kldxref on MIPS. 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
2019-04-24 23:35:10 +00:00
/*-
spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch up to that fact and revert to their recommended match of BSD-2-Clause. Discussed with: pfg MFC After: 3 days Sponsored by: Netflix
2023-05-10 15:40:58 +00:00
* SPDX-License-Identifier: BSD-2-Clause
Parse MIPS relocations to unbreak kldxref on MIPS. 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
2019-04-24 23:35:10 +00:00
*
* 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.
*/
kldxref: Make use of libelf to be a portable cross tool This allows kldxref to operate on kernel objects from any architecture, not just the native architecture. In particular, this will permit generating linker.hints files as part of a cross-arch release build. - elf.c is a new file that includes various wrappers around libelf including routines to read ELF data structures such as program and section headers and ELF relocations into the "generic" forms described in <gelf.h>. This file also provides routines for converting a linker set into an array of addresses (GElf_Addr) as well as reading architecture-specific mod_* structures and converting them into "generic" Gmod_* forms where pointers are replaced with addresses. - The various architecture-specific reloc handlers now use GElf_* types for most values (including GElf_Rel and GElf_Rela for relocation structures) and use routines from <sys/endian.h> to read and write target values. A new linker set matches reloc handlers to specific ELF (class, encoding, machine) tuples. - The bits of kldxref.c that write out linker.hints now use the encoding (ELFDATA2[LM]SB) of the first file encountered in a directory to set the endianness of the output file. Input files with a different architecture in the same directory are skipped with a warning. In addition, the initial version record for the file must be deferred until the first record is finished since the architecture of the output file is not known until then. - Various places that used 'sizeof(void *)' throughout now use 'elf_pointer_size()' to determine the size of a pointer in the target architecture. Tested by: amd64 binary on both amd64 and i386 /boot/kernel Reviewed by: imp Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D42966
2023-12-12 23:43:00 +00:00
#include <sys/endian.h>
Parse MIPS relocations to unbreak kldxref on MIPS. 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
2019-04-24 23:35:10 +00:00
#include <err.h>
#include <errno.h>
kldxref: Make use of libelf to be a portable cross tool This allows kldxref to operate on kernel objects from any architecture, not just the native architecture. In particular, this will permit generating linker.hints files as part of a cross-arch release build. - elf.c is a new file that includes various wrappers around libelf including routines to read ELF data structures such as program and section headers and ELF relocations into the "generic" forms described in <gelf.h>. This file also provides routines for converting a linker set into an array of addresses (GElf_Addr) as well as reading architecture-specific mod_* structures and converting them into "generic" Gmod_* forms where pointers are replaced with addresses. - The various architecture-specific reloc handlers now use GElf_* types for most values (including GElf_Rel and GElf_Rela for relocation structures) and use routines from <sys/endian.h> to read and write target values. A new linker set matches reloc handlers to specific ELF (class, encoding, machine) tuples. - The bits of kldxref.c that write out linker.hints now use the encoding (ELFDATA2[LM]SB) of the first file encountered in a directory to set the endianness of the output file. Input files with a different architecture in the same directory are skipped with a warning. In addition, the initial version record for the file must be deferred until the first record is finished since the architecture of the output file is not known until then. - Various places that used 'sizeof(void *)' throughout now use 'elf_pointer_size()' to determine the size of a pointer in the target architecture. Tested by: amd64 binary on both amd64 and i386 /boot/kernel Reviewed by: imp Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D42966
2023-12-12 23:43:00 +00:00
#include <gelf.h>
Parse MIPS relocations to unbreak kldxref on MIPS. 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
2019-04-24 23:35:10 +00:00
#include "ef.h"
/*
kldxref: Reduce divergence between per-architecture files Note that relbase is always 0 for DSOs so its omission for __KLD_SHARED architectures was not a bug in practice. Whilst here, also parenthesise the dest offset for where to avoid transiently creating an out-of-bounds pointer, which is UB (though even on CHERI architectures, where capability bounds compression can result in that creating invalid capabilities that will trap on dereference, optimisation will reassociate to the correct form in practice and thus work just fine).
2023-12-14 20:17:20 +00:00
* 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
Parse MIPS relocations to unbreak kldxref on MIPS. 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
2019-04-24 23:35:10 +00:00
*/
kldxref: Make use of libelf to be a portable cross tool This allows kldxref to operate on kernel objects from any architecture, not just the native architecture. In particular, this will permit generating linker.hints files as part of a cross-arch release build. - elf.c is a new file that includes various wrappers around libelf including routines to read ELF data structures such as program and section headers and ELF relocations into the "generic" forms described in <gelf.h>. This file also provides routines for converting a linker set into an array of addresses (GElf_Addr) as well as reading architecture-specific mod_* structures and converting them into "generic" Gmod_* forms where pointers are replaced with addresses. - The various architecture-specific reloc handlers now use GElf_* types for most values (including GElf_Rel and GElf_Rela for relocation structures) and use routines from <sys/endian.h> to read and write target values. A new linker set matches reloc handlers to specific ELF (class, encoding, machine) tuples. - The bits of kldxref.c that write out linker.hints now use the encoding (ELFDATA2[LM]SB) of the first file encountered in a directory to set the endianness of the output file. Input files with a different architecture in the same directory are skipped with a warning. In addition, the initial version record for the file must be deferred until the first record is finished since the architecture of the output file is not known until then. - Various places that used 'sizeof(void *)' throughout now use 'elf_pointer_size()' to determine the size of a pointer in the target architecture. Tested by: amd64 binary on both amd64 and i386 /boot/kernel Reviewed by: imp Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D42966
2023-12-12 23:43:00 +00:00
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)
Parse MIPS relocations to unbreak kldxref on MIPS. 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
2019-04-24 23:35:10 +00:00
{
kldxref: Make use of libelf to be a portable cross tool This allows kldxref to operate on kernel objects from any architecture, not just the native architecture. In particular, this will permit generating linker.hints files as part of a cross-arch release build. - elf.c is a new file that includes various wrappers around libelf including routines to read ELF data structures such as program and section headers and ELF relocations into the "generic" forms described in <gelf.h>. This file also provides routines for converting a linker set into an array of addresses (GElf_Addr) as well as reading architecture-specific mod_* structures and converting them into "generic" Gmod_* forms where pointers are replaced with addresses. - The various architecture-specific reloc handlers now use GElf_* types for most values (including GElf_Rel and GElf_Rela for relocation structures) and use routines from <sys/endian.h> to read and write target values. A new linker set matches reloc handlers to specific ELF (class, encoding, machine) tuples. - The bits of kldxref.c that write out linker.hints now use the encoding (ELFDATA2[LM]SB) of the first file encountered in a directory to set the endianness of the output file. Input files with a different architecture in the same directory are skipped with a warning. In addition, the initial version record for the file must be deferred until the first record is finished since the architecture of the output file is not known until then. - Various places that used 'sizeof(void *)' throughout now use 'elf_pointer_size()' to determine the size of a pointer in the target architecture. Tested by: amd64 binary on both amd64 and i386 /boot/kernel Reviewed by: imp Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D42966
2023-12-12 23:43:00 +00:00
char *where;
kldxref: Reduce divergence between per-architecture files Note that relbase is always 0 for DSOs so its omission for __KLD_SHARED architectures was not a bug in practice. Whilst here, also parenthesise the dest offset for where to avoid transiently creating an out-of-bounds pointer, which is UB (though even on CHERI architectures, where capability bounds compression can result in that creating invalid capabilities that will trap on dereference, optimisation will reassociate to the correct form in practice and thus work just fine).
2023-12-14 20:17:20 +00:00
GElf_Addr addr, addend;
GElf_Size rtype, symidx;
kldxref: Make use of libelf to be a portable cross tool This allows kldxref to operate on kernel objects from any architecture, not just the native architecture. In particular, this will permit generating linker.hints files as part of a cross-arch release build. - elf.c is a new file that includes various wrappers around libelf including routines to read ELF data structures such as program and section headers and ELF relocations into the "generic" forms described in <gelf.h>. This file also provides routines for converting a linker set into an array of addresses (GElf_Addr) as well as reading architecture-specific mod_* structures and converting them into "generic" Gmod_* forms where pointers are replaced with addresses. - The various architecture-specific reloc handlers now use GElf_* types for most values (including GElf_Rel and GElf_Rela for relocation structures) and use routines from <sys/endian.h> to read and write target values. A new linker set matches reloc handlers to specific ELF (class, encoding, machine) tuples. - The bits of kldxref.c that write out linker.hints now use the encoding (ELFDATA2[LM]SB) of the first file encountered in a directory to set the endianness of the output file. Input files with a different architecture in the same directory are skipped with a warning. In addition, the initial version record for the file must be deferred until the first record is finished since the architecture of the output file is not known until then. - Various places that used 'sizeof(void *)' throughout now use 'elf_pointer_size()' to determine the size of a pointer in the target architecture. Tested by: amd64 binary on both amd64 and i386 /boot/kernel Reviewed by: imp Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D42966
2023-12-12 23:43:00 +00:00
const GElf_Rel *rel;
const GElf_Rela *rela;
Parse MIPS relocations to unbreak kldxref on MIPS. 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
2019-04-24 23:35:10 +00:00
switch (reltype) {
kldxref: Make use of libelf to be a portable cross tool This allows kldxref to operate on kernel objects from any architecture, not just the native architecture. In particular, this will permit generating linker.hints files as part of a cross-arch release build. - elf.c is a new file that includes various wrappers around libelf including routines to read ELF data structures such as program and section headers and ELF relocations into the "generic" forms described in <gelf.h>. This file also provides routines for converting a linker set into an array of addresses (GElf_Addr) as well as reading architecture-specific mod_* structures and converting them into "generic" Gmod_* forms where pointers are replaced with addresses. - The various architecture-specific reloc handlers now use GElf_* types for most values (including GElf_Rel and GElf_Rela for relocation structures) and use routines from <sys/endian.h> to read and write target values. A new linker set matches reloc handlers to specific ELF (class, encoding, machine) tuples. - The bits of kldxref.c that write out linker.hints now use the encoding (ELFDATA2[LM]SB) of the first file encountered in a directory to set the endianness of the output file. Input files with a different architecture in the same directory are skipped with a warning. In addition, the initial version record for the file must be deferred until the first record is finished since the architecture of the output file is not known until then. - Various places that used 'sizeof(void *)' throughout now use 'elf_pointer_size()' to determine the size of a pointer in the target architecture. Tested by: amd64 binary on both amd64 and i386 /boot/kernel Reviewed by: imp Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D42966
2023-12-12 23:43:00 +00:00
case ELF_T_REL:
rel = (const GElf_Rel *)reldata;
kldxref: Reduce divergence between per-architecture files Note that relbase is always 0 for DSOs so its omission for __KLD_SHARED architectures was not a bug in practice. Whilst here, also parenthesise the dest offset for where to avoid transiently creating an out-of-bounds pointer, which is UB (though even on CHERI architectures, where capability bounds compression can result in that creating invalid capabilities that will trap on dereference, optimisation will reassociate to the correct form in practice and thus work just fine).
2023-12-14 20:17:20 +00:00
where = (char *)dest + (relbase + rel->r_offset - dataoff);
Parse MIPS relocations to unbreak kldxref on MIPS. 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
2019-04-24 23:35:10 +00:00
addend = 0;
kldxref: Make use of libelf to be a portable cross tool This allows kldxref to operate on kernel objects from any architecture, not just the native architecture. In particular, this will permit generating linker.hints files as part of a cross-arch release build. - elf.c is a new file that includes various wrappers around libelf including routines to read ELF data structures such as program and section headers and ELF relocations into the "generic" forms described in <gelf.h>. This file also provides routines for converting a linker set into an array of addresses (GElf_Addr) as well as reading architecture-specific mod_* structures and converting them into "generic" Gmod_* forms where pointers are replaced with addresses. - The various architecture-specific reloc handlers now use GElf_* types for most values (including GElf_Rel and GElf_Rela for relocation structures) and use routines from <sys/endian.h> to read and write target values. A new linker set matches reloc handlers to specific ELF (class, encoding, machine) tuples. - The bits of kldxref.c that write out linker.hints now use the encoding (ELFDATA2[LM]SB) of the first file encountered in a directory to set the endianness of the output file. Input files with a different architecture in the same directory are skipped with a warning. In addition, the initial version record for the file must be deferred until the first record is finished since the architecture of the output file is not known until then. - Various places that used 'sizeof(void *)' throughout now use 'elf_pointer_size()' to determine the size of a pointer in the target architecture. Tested by: amd64 binary on both amd64 and i386 /boot/kernel Reviewed by: imp Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D42966
2023-12-12 23:43:00 +00:00
rtype = GELF_R_TYPE(rel->r_info);
symidx = GELF_R_SYM(rel->r_info);
Parse MIPS relocations to unbreak kldxref on MIPS. 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
2019-04-24 23:35:10 +00:00
break;
kldxref: Make use of libelf to be a portable cross tool This allows kldxref to operate on kernel objects from any architecture, not just the native architecture. In particular, this will permit generating linker.hints files as part of a cross-arch release build. - elf.c is a new file that includes various wrappers around libelf including routines to read ELF data structures such as program and section headers and ELF relocations into the "generic" forms described in <gelf.h>. This file also provides routines for converting a linker set into an array of addresses (GElf_Addr) as well as reading architecture-specific mod_* structures and converting them into "generic" Gmod_* forms where pointers are replaced with addresses. - The various architecture-specific reloc handlers now use GElf_* types for most values (including GElf_Rel and GElf_Rela for relocation structures) and use routines from <sys/endian.h> to read and write target values. A new linker set matches reloc handlers to specific ELF (class, encoding, machine) tuples. - The bits of kldxref.c that write out linker.hints now use the encoding (ELFDATA2[LM]SB) of the first file encountered in a directory to set the endianness of the output file. Input files with a different architecture in the same directory are skipped with a warning. In addition, the initial version record for the file must be deferred until the first record is finished since the architecture of the output file is not known until then. - Various places that used 'sizeof(void *)' throughout now use 'elf_pointer_size()' to determine the size of a pointer in the target architecture. Tested by: amd64 binary on both amd64 and i386 /boot/kernel Reviewed by: imp Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D42966
2023-12-12 23:43:00 +00:00
case ELF_T_RELA:
rela = (const GElf_Rela *)reldata;
kldxref: Reduce divergence between per-architecture files Note that relbase is always 0 for DSOs so its omission for __KLD_SHARED architectures was not a bug in practice. Whilst here, also parenthesise the dest offset for where to avoid transiently creating an out-of-bounds pointer, which is UB (though even on CHERI architectures, where capability bounds compression can result in that creating invalid capabilities that will trap on dereference, optimisation will reassociate to the correct form in practice and thus work just fine).
2023-12-14 20:17:20 +00:00
where = (char *)dest + (relbase + rela->r_offset - dataoff);
Parse MIPS relocations to unbreak kldxref on MIPS. 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
2019-04-24 23:35:10 +00:00
addend = rela->r_addend;
kldxref: Make use of libelf to be a portable cross tool This allows kldxref to operate on kernel objects from any architecture, not just the native architecture. In particular, this will permit generating linker.hints files as part of a cross-arch release build. - elf.c is a new file that includes various wrappers around libelf including routines to read ELF data structures such as program and section headers and ELF relocations into the "generic" forms described in <gelf.h>. This file also provides routines for converting a linker set into an array of addresses (GElf_Addr) as well as reading architecture-specific mod_* structures and converting them into "generic" Gmod_* forms where pointers are replaced with addresses. - The various architecture-specific reloc handlers now use GElf_* types for most values (including GElf_Rel and GElf_Rela for relocation structures) and use routines from <sys/endian.h> to read and write target values. A new linker set matches reloc handlers to specific ELF (class, encoding, machine) tuples. - The bits of kldxref.c that write out linker.hints now use the encoding (ELFDATA2[LM]SB) of the first file encountered in a directory to set the endianness of the output file. Input files with a different architecture in the same directory are skipped with a warning. In addition, the initial version record for the file must be deferred until the first record is finished since the architecture of the output file is not known until then. - Various places that used 'sizeof(void *)' throughout now use 'elf_pointer_size()' to determine the size of a pointer in the target architecture. Tested by: amd64 binary on both amd64 and i386 /boot/kernel Reviewed by: imp Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D42966
2023-12-12 23:43:00 +00:00
rtype = GELF_R_TYPE(rela->r_info);
symidx = GELF_R_SYM(rela->r_info);
Parse MIPS relocations to unbreak kldxref on MIPS. 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
2019-04-24 23:35:10 +00:00
break;
default:
return (EINVAL);
}
kldxref: Make use of libelf to be a portable cross tool This allows kldxref to operate on kernel objects from any architecture, not just the native architecture. In particular, this will permit generating linker.hints files as part of a cross-arch release build. - elf.c is a new file that includes various wrappers around libelf including routines to read ELF data structures such as program and section headers and ELF relocations into the "generic" forms described in <gelf.h>. This file also provides routines for converting a linker set into an array of addresses (GElf_Addr) as well as reading architecture-specific mod_* structures and converting them into "generic" Gmod_* forms where pointers are replaced with addresses. - The various architecture-specific reloc handlers now use GElf_* types for most values (including GElf_Rel and GElf_Rela for relocation structures) and use routines from <sys/endian.h> to read and write target values. A new linker set matches reloc handlers to specific ELF (class, encoding, machine) tuples. - The bits of kldxref.c that write out linker.hints now use the encoding (ELFDATA2[LM]SB) of the first file encountered in a directory to set the endianness of the output file. Input files with a different architecture in the same directory are skipped with a warning. In addition, the initial version record for the file must be deferred until the first record is finished since the architecture of the output file is not known until then. - Various places that used 'sizeof(void *)' throughout now use 'elf_pointer_size()' to determine the size of a pointer in the target architecture. Tested by: amd64 binary on both amd64 and i386 /boot/kernel Reviewed by: imp Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D42966
2023-12-12 23:43:00 +00:00
if (where < (char *)dest || where >= (char *)dest + len)
Parse MIPS relocations to unbreak kldxref on MIPS. 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
2019-04-24 23:35:10 +00:00
return (0);
kldxref: Make use of libelf to be a portable cross tool This allows kldxref to operate on kernel objects from any architecture, not just the native architecture. In particular, this will permit generating linker.hints files as part of a cross-arch release build. - elf.c is a new file that includes various wrappers around libelf including routines to read ELF data structures such as program and section headers and ELF relocations into the "generic" forms described in <gelf.h>. This file also provides routines for converting a linker set into an array of addresses (GElf_Addr) as well as reading architecture-specific mod_* structures and converting them into "generic" Gmod_* forms where pointers are replaced with addresses. - The various architecture-specific reloc handlers now use GElf_* types for most values (including GElf_Rel and GElf_Rela for relocation structures) and use routines from <sys/endian.h> to read and write target values. A new linker set matches reloc handlers to specific ELF (class, encoding, machine) tuples. - The bits of kldxref.c that write out linker.hints now use the encoding (ELFDATA2[LM]SB) of the first file encountered in a directory to set the endianness of the output file. Input files with a different architecture in the same directory are skipped with a warning. In addition, the initial version record for the file must be deferred until the first record is finished since the architecture of the output file is not known until then. - Various places that used 'sizeof(void *)' throughout now use 'elf_pointer_size()' to determine the size of a pointer in the target architecture. Tested by: amd64 binary on both amd64 and i386 /boot/kernel Reviewed by: imp Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D42966
2023-12-12 23:43:00 +00:00
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);
}
}
Parse MIPS relocations to unbreak kldxref on MIPS. 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
2019-04-24 23:35:10 +00:00
switch (rtype) {
case R_MIPS_64: /* S + A */
kldxref: Reduce divergence between per-architecture files Note that relbase is always 0 for DSOs so its omission for __KLD_SHARED architectures was not a bug in practice. Whilst here, also parenthesise the dest offset for where to avoid transiently creating an out-of-bounds pointer, which is UB (though even on CHERI architectures, where capability bounds compression can result in that creating invalid capabilities that will trap on dereference, optimisation will reassociate to the correct form in practice and thus work just fine).
2023-12-14 20:17:20 +00:00
addr = EF_SYMADDR(ef, symidx) + addend;
kldxref: Make use of libelf to be a portable cross tool This allows kldxref to operate on kernel objects from any architecture, not just the native architecture. In particular, this will permit generating linker.hints files as part of a cross-arch release build. - elf.c is a new file that includes various wrappers around libelf including routines to read ELF data structures such as program and section headers and ELF relocations into the "generic" forms described in <gelf.h>. This file also provides routines for converting a linker set into an array of addresses (GElf_Addr) as well as reading architecture-specific mod_* structures and converting them into "generic" Gmod_* forms where pointers are replaced with addresses. - The various architecture-specific reloc handlers now use GElf_* types for most values (including GElf_Rel and GElf_Rela for relocation structures) and use routines from <sys/endian.h> to read and write target values. A new linker set matches reloc handlers to specific ELF (class, encoding, machine) tuples. - The bits of kldxref.c that write out linker.hints now use the encoding (ELFDATA2[LM]SB) of the first file encountered in a directory to set the endianness of the output file. Input files with a different architecture in the same directory are skipped with a warning. In addition, the initial version record for the file must be deferred until the first record is finished since the architecture of the output file is not known until then. - Various places that used 'sizeof(void *)' throughout now use 'elf_pointer_size()' to determine the size of a pointer in the target architecture. Tested by: amd64 binary on both amd64 and i386 /boot/kernel Reviewed by: imp Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D42966
2023-12-12 23:43:00 +00:00
if (elf_encoding(ef) == ELFDATA2LSB)
kldxref: Reduce divergence between per-architecture files Note that relbase is always 0 for DSOs so its omission for __KLD_SHARED architectures was not a bug in practice. Whilst here, also parenthesise the dest offset for where to avoid transiently creating an out-of-bounds pointer, which is UB (though even on CHERI architectures, where capability bounds compression can result in that creating invalid capabilities that will trap on dereference, optimisation will reassociate to the correct form in practice and thus work just fine).
2023-12-14 20:17:20 +00:00
le64enc(where, addr);
kldxref: Make use of libelf to be a portable cross tool This allows kldxref to operate on kernel objects from any architecture, not just the native architecture. In particular, this will permit generating linker.hints files as part of a cross-arch release build. - elf.c is a new file that includes various wrappers around libelf including routines to read ELF data structures such as program and section headers and ELF relocations into the "generic" forms described in <gelf.h>. This file also provides routines for converting a linker set into an array of addresses (GElf_Addr) as well as reading architecture-specific mod_* structures and converting them into "generic" Gmod_* forms where pointers are replaced with addresses. - The various architecture-specific reloc handlers now use GElf_* types for most values (including GElf_Rel and GElf_Rela for relocation structures) and use routines from <sys/endian.h> to read and write target values. A new linker set matches reloc handlers to specific ELF (class, encoding, machine) tuples. - The bits of kldxref.c that write out linker.hints now use the encoding (ELFDATA2[LM]SB) of the first file encountered in a directory to set the endianness of the output file. Input files with a different architecture in the same directory are skipped with a warning. In addition, the initial version record for the file must be deferred until the first record is finished since the architecture of the output file is not known until then. - Various places that used 'sizeof(void *)' throughout now use 'elf_pointer_size()' to determine the size of a pointer in the target architecture. Tested by: amd64 binary on both amd64 and i386 /boot/kernel Reviewed by: imp Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D42966
2023-12-12 23:43:00 +00:00
else
kldxref: Reduce divergence between per-architecture files Note that relbase is always 0 for DSOs so its omission for __KLD_SHARED architectures was not a bug in practice. Whilst here, also parenthesise the dest offset for where to avoid transiently creating an out-of-bounds pointer, which is UB (though even on CHERI architectures, where capability bounds compression can result in that creating invalid capabilities that will trap on dereference, optimisation will reassociate to the correct form in practice and thus work just fine).
2023-12-14 20:17:20 +00:00
be64enc(where, addr);
kldxref: Make use of libelf to be a portable cross tool This allows kldxref to operate on kernel objects from any architecture, not just the native architecture. In particular, this will permit generating linker.hints files as part of a cross-arch release build. - elf.c is a new file that includes various wrappers around libelf including routines to read ELF data structures such as program and section headers and ELF relocations into the "generic" forms described in <gelf.h>. This file also provides routines for converting a linker set into an array of addresses (GElf_Addr) as well as reading architecture-specific mod_* structures and converting them into "generic" Gmod_* forms where pointers are replaced with addresses. - The various architecture-specific reloc handlers now use GElf_* types for most values (including GElf_Rel and GElf_Rela for relocation structures) and use routines from <sys/endian.h> to read and write target values. A new linker set matches reloc handlers to specific ELF (class, encoding, machine) tuples. - The bits of kldxref.c that write out linker.hints now use the encoding (ELFDATA2[LM]SB) of the first file encountered in a directory to set the endianness of the output file. Input files with a different architecture in the same directory are skipped with a warning. In addition, the initial version record for the file must be deferred until the first record is finished since the architecture of the output file is not known until then. - Various places that used 'sizeof(void *)' throughout now use 'elf_pointer_size()' to determine the size of a pointer in the target architecture. Tested by: amd64 binary on both amd64 and i386 /boot/kernel Reviewed by: imp Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D42966
2023-12-12 23:43:00 +00:00
break;
Parse MIPS relocations to unbreak kldxref on MIPS. 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
2019-04-24 23:35:10 +00:00
case R_MIPS_32: /* S + A */
kldxref: Reduce divergence between per-architecture files Note that relbase is always 0 for DSOs so its omission for __KLD_SHARED architectures was not a bug in practice. Whilst here, also parenthesise the dest offset for where to avoid transiently creating an out-of-bounds pointer, which is UB (though even on CHERI architectures, where capability bounds compression can result in that creating invalid capabilities that will trap on dereference, optimisation will reassociate to the correct form in practice and thus work just fine).
2023-12-14 20:17:20 +00:00
addr = EF_SYMADDR(ef, symidx) + addend;
kldxref: Make use of libelf to be a portable cross tool This allows kldxref to operate on kernel objects from any architecture, not just the native architecture. In particular, this will permit generating linker.hints files as part of a cross-arch release build. - elf.c is a new file that includes various wrappers around libelf including routines to read ELF data structures such as program and section headers and ELF relocations into the "generic" forms described in <gelf.h>. This file also provides routines for converting a linker set into an array of addresses (GElf_Addr) as well as reading architecture-specific mod_* structures and converting them into "generic" Gmod_* forms where pointers are replaced with addresses. - The various architecture-specific reloc handlers now use GElf_* types for most values (including GElf_Rel and GElf_Rela for relocation structures) and use routines from <sys/endian.h> to read and write target values. A new linker set matches reloc handlers to specific ELF (class, encoding, machine) tuples. - The bits of kldxref.c that write out linker.hints now use the encoding (ELFDATA2[LM]SB) of the first file encountered in a directory to set the endianness of the output file. Input files with a different architecture in the same directory are skipped with a warning. In addition, the initial version record for the file must be deferred until the first record is finished since the architecture of the output file is not known until then. - Various places that used 'sizeof(void *)' throughout now use 'elf_pointer_size()' to determine the size of a pointer in the target architecture. Tested by: amd64 binary on both amd64 and i386 /boot/kernel Reviewed by: imp Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D42966
2023-12-12 23:43:00 +00:00
if (elf_encoding(ef) == ELFDATA2LSB)
kldxref: Reduce divergence between per-architecture files Note that relbase is always 0 for DSOs so its omission for __KLD_SHARED architectures was not a bug in practice. Whilst here, also parenthesise the dest offset for where to avoid transiently creating an out-of-bounds pointer, which is UB (though even on CHERI architectures, where capability bounds compression can result in that creating invalid capabilities that will trap on dereference, optimisation will reassociate to the correct form in practice and thus work just fine).
2023-12-14 20:17:20 +00:00
le32enc(where, addr);
kldxref: Make use of libelf to be a portable cross tool This allows kldxref to operate on kernel objects from any architecture, not just the native architecture. In particular, this will permit generating linker.hints files as part of a cross-arch release build. - elf.c is a new file that includes various wrappers around libelf including routines to read ELF data structures such as program and section headers and ELF relocations into the "generic" forms described in <gelf.h>. This file also provides routines for converting a linker set into an array of addresses (GElf_Addr) as well as reading architecture-specific mod_* structures and converting them into "generic" Gmod_* forms where pointers are replaced with addresses. - The various architecture-specific reloc handlers now use GElf_* types for most values (including GElf_Rel and GElf_Rela for relocation structures) and use routines from <sys/endian.h> to read and write target values. A new linker set matches reloc handlers to specific ELF (class, encoding, machine) tuples. - The bits of kldxref.c that write out linker.hints now use the encoding (ELFDATA2[LM]SB) of the first file encountered in a directory to set the endianness of the output file. Input files with a different architecture in the same directory are skipped with a warning. In addition, the initial version record for the file must be deferred until the first record is finished since the architecture of the output file is not known until then. - Various places that used 'sizeof(void *)' throughout now use 'elf_pointer_size()' to determine the size of a pointer in the target architecture. Tested by: amd64 binary on both amd64 and i386 /boot/kernel Reviewed by: imp Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D42966
2023-12-12 23:43:00 +00:00
else
kldxref: Reduce divergence between per-architecture files Note that relbase is always 0 for DSOs so its omission for __KLD_SHARED architectures was not a bug in practice. Whilst here, also parenthesise the dest offset for where to avoid transiently creating an out-of-bounds pointer, which is UB (though even on CHERI architectures, where capability bounds compression can result in that creating invalid capabilities that will trap on dereference, optimisation will reassociate to the correct form in practice and thus work just fine).
2023-12-14 20:17:20 +00:00
be32enc(where, addr);
Parse MIPS relocations to unbreak kldxref on MIPS. 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
2019-04-24 23:35:10 +00:00
break;
default:
warnx("unhandled relocation type %d", (int)rtype);
}
return (0);
}
kldxref: Make use of libelf to be a portable cross tool This allows kldxref to operate on kernel objects from any architecture, not just the native architecture. In particular, this will permit generating linker.hints files as part of a cross-arch release build. - elf.c is a new file that includes various wrappers around libelf including routines to read ELF data structures such as program and section headers and ELF relocations into the "generic" forms described in <gelf.h>. This file also provides routines for converting a linker set into an array of addresses (GElf_Addr) as well as reading architecture-specific mod_* structures and converting them into "generic" Gmod_* forms where pointers are replaced with addresses. - The various architecture-specific reloc handlers now use GElf_* types for most values (including GElf_Rel and GElf_Rela for relocation structures) and use routines from <sys/endian.h> to read and write target values. A new linker set matches reloc handlers to specific ELF (class, encoding, machine) tuples. - The bits of kldxref.c that write out linker.hints now use the encoding (ELFDATA2[LM]SB) of the first file encountered in a directory to set the endianness of the output file. Input files with a different architecture in the same directory are skipped with a warning. In addition, the initial version record for the file must be deferred until the first record is finished since the architecture of the output file is not known until then. - Various places that used 'sizeof(void *)' throughout now use 'elf_pointer_size()' to determine the size of a pointer in the target architecture. Tested by: amd64 binary on both amd64 and i386 /boot/kernel Reviewed by: imp Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D42966
2023-12-12 23:43:00 +00:00
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);