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b991fc5207
This commit adds a utility function to get disassembled text for jited
representation of a BPF program designated by file descriptor.
Function prototype looks as follows:
int get_jited_program_text(int fd, char *text, size_t text_sz)
Where 'fd' is a file descriptor for the program, 'text' and 'text_sz'
refer to a destination buffer for disassembled text.
Output format looks as follows:
18: 77 06 ja L0
1a: 50 pushq %rax
1b: 48 89 e0 movq %rsp, %rax
1e: eb 01 jmp L1
20: 50 L0: pushq %rax
21: 50 L1: pushq %rax
^ ^^^^^^^^ ^ ^^^^^^^^^^^^^^^^^^
| binary insn | textual insn
| representation | representation
| |
instruction offset inferred local label name
The code and makefile changes are inspired by jit_disasm.c from bpftool.
Use llvm libraries to disassemble BPF program instead of libbfd to avoid
issues with disassembly output stability pointed out in [1].
Selftests makefile uses Makefile.feature to detect if LLVM libraries
are available. If that is not the case selftests build proceeds but
the function returns -EOPNOTSUPP at runtime.
[1] commit eb9d1acf63 ("bpftool: Add LLVM as default library for disassembling JIT-ed programs")
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20240820102357.3372779-6-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
52 lines
684 B
Plaintext
52 lines
684 B
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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bpftool
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bpf-helpers*
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bpf-syscall*
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test_verifier
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test_maps
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test_lru_map
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test_lpm_map
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test_tag
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FEATURE-DUMP.libbpf
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FEATURE-DUMP.selftests
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fixdep
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/test_progs
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/test_progs-no_alu32
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/test_progs-bpf_gcc
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/test_progs-cpuv4
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test_verifier_log
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feature
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test_sock
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urandom_read
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test_sockmap
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test_lirc_mode2_user
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test_flow_dissector
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flow_dissector_load
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test_tcpnotify_user
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test_libbpf
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test_tcp_check_syncookie_user
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test_sysctl
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xdping
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test_cpp
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*.d
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*.subskel.h
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*.skel.h
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*.lskel.h
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/no_alu32
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/bpf_gcc
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/cpuv4
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/host-tools
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/tools
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/runqslower
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/bench
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/veristat
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/sign-file
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/uprobe_multi
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*.ko
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*.tmp
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xskxceiver
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xdp_redirect_multi
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xdp_synproxy
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xdp_hw_metadata
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xdp_features
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