Jose E. Marchesi
1e18ffc991
This patch adds support for EF_BPF_CPUVER bits in the ELF
machine-dependent header flags. These bits encode the BPF CPU
version for which the object file has been compiled for.
The BPF assembler is updated so it annotates the object files it
generates with these bits.
The BPF disassembler is updated so it honors EF_BPF_CPUVER to use the
appropriate ISA version if the user didn't specify an explicit ISA
version in the command line. Note that a value of zero in
EF_BPF_CPUVER is interpreted by the disassembler as "use the later
supported version" (the BPF CPU versions start with v1.)
The readelf utility is updated to pretty print EF_BPF_CPUVER when it
prints out the ELF header:
$ readelf -h a.out
ELF Header:
...
Flags: 0x4, CPU Version: 4
Tested in bpf-unknown-none.
include/ChangeLog:
2023-07-30 Jose E. Marchesi <jose.marchesi@oracle.com>
* elf/bpf.h (EF_BPF_CPUVER): Define.
* opcode/bpf.h (BPF_XBPF): Change from 0xf to 0xff so it fits in
EF_BPF_CPUVER.
binutils/ChangeLog:
2023-07-30 Jose E. Marchesi <jose.marchesi@oracle.com>
* readelf.c (get_machine_flags): Recognize and pretty print BPF
machine flags.
opcodes/ChangeLog:
2023-07-30 Jose E. Marchesi <jose.marchesi@oracle.com>
* bpf-dis.c: Initialize asm_bpf_version to -1.
(print_insn_bpf): Set BPF ISA version from the cpu version ELF
header flags if no explicit version set in the command line.
* disassemble.c (disassemble_init_for_target): Remove unused code.
gas/ChangeLog:
2023-07-30 Jose E. Marchesi <jose.marchesi@oracle.com>
* config/tc-bpf.h (elf_tc_final_processing): Define.
* config/tc-bpf.c (bpf_elf_final_processing): New function.
46 lines
1.6 KiB
C
46 lines
1.6 KiB
C
/* Linux eBPF support for BFD.
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Copyright (C) 2019-2023 Free Software Foundation, Inc.
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Contributed by Oracle, Inc.
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
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#ifndef _ELF_BPF_H
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#define _ELF_BPF_H
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#include "elf/reloc-macros.h"
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/* Relocations. */
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START_RELOC_NUMBERS (elf_bpf_reloc_type)
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RELOC_NUMBER (R_BPF_NONE, 0)
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RELOC_NUMBER (R_BPF_64_64, 1)
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RELOC_NUMBER (R_BPF_64_ABS64, 2)
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RELOC_NUMBER (R_BPF_64_ABS32, 3)
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/* R_BPF_64_NODYLD32 is not used by GNU tools.
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* It is kept in this file to remind that the value is already taken. */
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RELOC_NUMBER (R_BPF_64_NODYLD32, 4)
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RELOC_NUMBER (R_BPF_64_32, 10)
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RELOC_NUMBER (R_BPF_GNU_64_16, 256)
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END_RELOC_NUMBERS (R_BPF_max)
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/* Processor specific flags for the ELF header e_flags field. */
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/* Version of the BPF ISA used in the file. */
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#define EF_BPF_CPUVER 0x0000000f
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#endif /* _ELF_BPF_H */
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