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@jouet 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@jouet bpf]# file hello.o hello.o: ELF 64-bit LSB relocatable, *unknown arch 0xf7* version 1 (SYSV), with debug_info, not stripped [root@jouet bpf]#Much better: [root@jouet 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@jouet bpf]# [root@jouet 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@jouet bpf]# Progress: [root@jouet bpf]# pahole --btf_encode hello.o sh: llvm-objcopy: command not found Failed to encode BTF [root@jouet bpf]# [acme@jouet 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@jouet 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@jouet 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@jouet bpf]# [acme@jouet perf]$ rpm -q clang llvm clang-5.0.1-5.fc27.x86_64 llvm-5.0.1-6.fc27.x86_64 [acme@jouet perf]$ [root@jouet 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@jouet bpf]# [acme@jouet perf]$ rpm -q clang llvm clang-5.0.1-5.fc27.x86_64 llvm-5.0.1-6.fc27.x86_64 [acme@jouet perf]$ - Arnaldo
