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Date: Fri, 15 Jun 2018 07:20:34 -0400
From: Bo YU <tsu.yubo@...il.com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Martin KaFai Lau <kafai@...com>, netdev@...r.kernel.org,
Alexei Starovoitov <ast@...com>,
Daniel Borkmann <daniel@...earbox.net>, kernel-team@...com,
Wang Nan <wangnan0@...wei.com>, Jiri Olsa <jolsa@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH bpf-next v5 00/10] BTF: BPF Type Format
Hi,
On Thu, Jun 07, 2018 at 04:30:29PM -0300, Arnaldo Carvalho de Melo wrote:
>Em Thu, Jun 07, 2018 at 12:05:10PM -0700, Martin KaFai Lau escreveu:
>dump-obj = true
>clang-opt = -g
>[root@...et bpf]# perf trace -e open*,hello.c touch /tmp/hello.BTF
>LLVM: dumping hello.o
> 0.185 ( ): __bpf_stdout__:Hello, world
> 0.188 ( 0.009 ms): touch/19670 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC ) = 3
> 0.219 ( ): __bpf_stdout__:Hello, world
> 0.220 ( 0.011 ms): touch/19670 openat(dfd: CWD, filename: /lib64/libc.so.6, flags: CLOEXEC ) = 3
> 0.480 ( 0.095 ms): touch/19670 open(filename: /usr/lib/locale/locale-archive, flags: CLOEXEC ) = 3
> 0.624 ( ): __bpf_stdout__:Hello, world
> 0.626 ( 0.011 ms): touch/19670 openat(dfd: CWD, filename: /tmp/hello.BTF, flags: CREAT|NOCTTY|NONBLOCK|WRONLY, mode: IRUGO|IWUGO) = 3
>[root@...et bpf]# file hello.o
>hello.o: ELF 64-bit LSB relocatable, *unknown arch 0xf7* version 1 (SYSV), with debug_info, not stripped
>[root@...et bpf]#
>
>Much better:
>
>[root@...et bpf]# readelf -SW hello.o
>There are 25 section headers, starting at offset 0xc70:
>
>Section Headers:
> [Nr] Name Type Address Off Size ES Flg Lk Inf Al
> [ 0] NULL 0000000000000000 000000 000000 00 0 0 0
> [ 1] .strtab STRTAB 0000000000000000 000b50 000119 00 0 0 1
> [ 2] .text PROGBITS 0000000000000000 000040 000000 00 AX 0 0 4
> [ 3] syscalls:sys_enter_openat PROGBITS 0000000000000000 000040 000088 00 AX 0 0 8
> [ 4] .relsyscalls:sys_enter_openat REL 0000000000000000 000910 000010 10 24 3 8
> [ 5] license PROGBITS 0000000000000000 0000c8 000004 00 WA 0 0 1
> [ 6] version PROGBITS 0000000000000000 0000cc 000004 00 WA 0 0 4
> [ 7] maps PROGBITS 0000000000000000 0000d0 000010 00 WA 0 0 4
> [ 8] .rodata.str1.1 PROGBITS 0000000000000000 0000e0 00000e 01 AMS 0 0 1
> [ 9] .debug_str PROGBITS 0000000000000000 0000ee 00010e 01 MS 0 0 1
> [10] .debug_loc PROGBITS 0000000000000000 0001fc 000023 00 0 0 1
> [11] .debug_abbrev PROGBITS 0000000000000000 00021f 0000e3 00 0 0 1
> [12] .debug_info PROGBITS 0000000000000000 000302 00015e 00 0 0 1
> [13] .rel.debug_info REL 0000000000000000 000920 0001e0 10 24 12 8
> [14] .debug_ranges PROGBITS 0000000000000000 000460 000030 00 0 0 1
> [15] .debug_macinfo PROGBITS 0000000000000000 000490 000001 00 0 0 1
> [16] .debug_pubnames PROGBITS 0000000000000000 000491 00006e 00 0 0 1
> [17] .rel.debug_pubnames REL 0000000000000000 000b00 000010 10 24 16 8
> [18] .debug_pubtypes PROGBITS 0000000000000000 0004ff 00005a 00 0 0 1
> [19] .rel.debug_pubtypes REL 0000000000000000 000b10 000010 10 24 18 8
> [20] .debug_frame PROGBITS 0000000000000000 000560 000028 00 0 0 8
> [21] .rel.debug_frame REL 0000000000000000 000b20 000020 10 24 20 8
> [22] .debug_line PROGBITS 0000000000000000 000588 00006e 00 0 0 1
> [23] .rel.debug_line REL 0000000000000000 000b40 000010 10 24 22 8
> [24] .symtab SYMTAB 0000000000000000 0005f8 000318 18 1 29 8
>Key to Flags:
> W (write), A (alloc), X (execute), M (merge), S (strings), I (info),
> L (link order), O (extra OS processing required), G (group), T (TLS),
> C (compressed), x (unknown), o (OS specific), E (exclude),
> p (processor specific)
>[root@...et bpf]#
>
>[root@...et bpf]# readelf -s hello.o
>
>Symbol table '.symtab' contains 33 entries:
> Num: Value Size Type Bind Vis Ndx Name
> 0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
> 1: 0000000000000000 0 NOTYPE LOCAL DEFAULT 9
> 2: 000000000000002d 0 NOTYPE LOCAL DEFAULT 9
> 3: 0000000000000044 0 NOTYPE LOCAL DEFAULT 9
> 4: 0000000000000053 0 NOTYPE LOCAL DEFAULT 9
> 5: 000000000000005c 0 NOTYPE LOCAL DEFAULT 9
> 6: 0000000000000061 0 NOTYPE LOCAL DEFAULT 9
> 7: 000000000000006a 0 NOTYPE LOCAL DEFAULT 9
> 8: 0000000000000073 0 NOTYPE LOCAL DEFAULT 9
> 9: 0000000000000077 0 NOTYPE LOCAL DEFAULT 9
> 10: 0000000000000086 0 NOTYPE LOCAL DEFAULT 9
> 11: 000000000000008b 0 NOTYPE LOCAL DEFAULT 9
> 12: 0000000000000098 0 NOTYPE LOCAL DEFAULT 9
> 13: 00000000000000a1 0 NOTYPE LOCAL DEFAULT 9
> 14: 00000000000000ac 0 NOTYPE LOCAL DEFAULT 9
> 15: 00000000000000b8 0 NOTYPE LOCAL DEFAULT 9
> 16: 00000000000000c4 0 NOTYPE LOCAL DEFAULT 9
> 17: 00000000000000d6 0 NOTYPE LOCAL DEFAULT 9
> 18: 00000000000000e8 0 NOTYPE LOCAL DEFAULT 9
> 19: 00000000000000fd 0 NOTYPE LOCAL DEFAULT 9
> 20: 0000000000000101 0 NOTYPE LOCAL DEFAULT 9
> 21: 0000000000000107 0 NOTYPE LOCAL DEFAULT 9
> 22: 0000000000000000 0 SECTION LOCAL DEFAULT 3
> 23: 0000000000000000 0 SECTION LOCAL DEFAULT 10
> 24: 0000000000000000 0 SECTION LOCAL DEFAULT 11
> 25: 0000000000000000 0 SECTION LOCAL DEFAULT 12
> 26: 0000000000000000 0 SECTION LOCAL DEFAULT 14
> 27: 0000000000000000 0 SECTION LOCAL DEFAULT 20
> 28: 0000000000000000 0 SECTION LOCAL DEFAULT 22
> 29: 0000000000000000 0 NOTYPE GLOBAL DEFAULT 7 __bpf_stdout__
> 30: 0000000000000000 0 NOTYPE GLOBAL DEFAULT 5 _license
> 31: 0000000000000000 0 NOTYPE GLOBAL DEFAULT 6 _version
> 32: 0000000000000000 0 NOTYPE GLOBAL DEFAULT 3 syscall_enter_openat
>[root@...et bpf]#
>
>Progress:
>
>[root@...et bpf]# pahole --btf_encode hello.o
>sh: llvm-objcopy: command not found
>Failed to encode BTF
>[root@...et bpf]#
>
>[acme@...et perf]$ llvm-
>llvm-ar llvm-cov llvm-dis llvm-lib llvm-modextract llvm-profdata llvm-split
>llvm-as llvm-c-test llvm-dlltool llvm-link llvm-mt llvm-ranlib llvm-stress
>llvm-bcanalyzer llvm-cvtres llvm-dsymutil llvm-lto llvm-nm llvm-readelf llvm-strings
>llvm-cat llvm-cxxdump llvm-dwarfdump llvm-lto2 llvm-objdump llvm-readobj llvm-symbolizer
>llvm-config llvm-cxxfilt llvm-dwp llvm-mc llvm-opt-report llvm-rtdyld llvm-tblgen
>llvm-config-64 llvm-diff llvm-extract llvm-mcmarkup llvm-pdbutil llvm-size llvm-xray
>[acme@...et perf]$ llvm-
Sorry, maybe i make a noise for the thread.
Could you share how you put the output above in mutt's reply mode?
Thank you in advance!
>
>So this must be available in a newer llvm version? Which one?
>
>[root@...et bpf]# clang -v
>clang version 5.0.1 (tags/RELEASE_501/final)
>Target: x86_64-unknown-linux-gnu
>Thread model: posix
>InstalledDir: /usr/bin
>Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-redhat-linux/7
>Found candidate GCC installation: /usr/lib/gcc/x86_64-redhat-linux/7
>Selected GCC installation: /usr/bin/../lib/gcc/x86_64-redhat-linux/7
>Candidate multilib: .;@m64
>Candidate multilib: 32;@m32
>Selected multilib: .;@m64
>[root@...et bpf]#
>
>[acme@...et perf]$ rpm -q clang llvm
>clang-5.0.1-5.fc27.x86_64
>llvm-5.0.1-6.fc27.x86_64
>[acme@...et perf]$
>[root@...et bpf]# clang -v
>clang version 5.0.1 (tags/RELEASE_501/final)
>Target: x86_64-unknown-linux-gnu
>Thread model: posix
>InstalledDir: /usr/bin
>Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-redhat-linux/7
>Found candidate GCC installation: /usr/lib/gcc/x86_64-redhat-linux/7
>Selected GCC installation: /usr/bin/../lib/gcc/x86_64-redhat-linux/7
>Candidate multilib: .;@m64
>Candidate multilib: 32;@m32
>Selected multilib: .;@m64
>[root@...et bpf]#
>
>[acme@...et perf]$ rpm -q clang llvm
>clang-5.0.1-5.fc27.x86_64
>llvm-5.0.1-6.fc27.x86_64
>[acme@...et perf]$
>
>- Arnaldo
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